CN107612018B

CN107612018B - The control method and device of inverter, inverter, computer readable storage medium

Info

Publication number: CN107612018B
Application number: CN201710697429.4A
Authority: CN
Inventors: 徐志武; 李琳
Original assignee: Huawei Digital Technologies Suzhou Co Ltd
Current assignee: Huawei Digital Power Technologies Co Ltd
Priority date: 2017-08-15
Filing date: 2017-08-15
Publication date: 2019-08-23
Anticipated expiration: 2037-08-15
Also published as: CN107612018A

Abstract

The application discloses a kind of control method and device of inverter, inverter, computer readable storage medium, the control method includes: to obtain the reactance value between the ac output end of the inverter and grid integration point when the ac output end of the inverter is connected with a grid integration point of power grid；Obtain the deviation between the reference value of the output voltage of the inverter and the value of feedback of the output voltage of the inverter；When the output electric current of the inverter is less than the maximum allowable output electric current of the inverter, keep the active power of the inverter constant, based on the reactive power of inverter described in the reactance value and the bias adjustment, so that the output voltage of the inverter is able to maintain in the reference value of the output voltage of the inverter.The application can effectively reduce the complete machine transfer efficiency that inverter loses to adjust output voltage, facilitate the conversion performance for improving inverter, promote the overall power generation efficiency of electricity generation system.

Description

The control method and device of inverter, inverter, computer readable storage medium

Technical field

This application involves electronic and electrical field, in particular to a kind of control method and device of inverter, inverter, calculating Machine readable storage medium storing program for executing.

Background technique

Inverter is that all kinds of generating equipments send direct current energy as a kind of equipment that direct current can be converted to alternating current Enter essential when AC network.In all kinds of energy that can be converted into electric energy, solar energy as it is a kind of environmental protection and Reproducible new energy is increasingly subject to favor, and the photovoltaic power generation for converting solar energy into electric energy also receives more and more passes Note.In photovoltaic power generation, in order to which the electric energy for issuing solar battery is sent into power grid, the output port and power grid in electric energy are needed Input port between configure inverter, and conversion of the direct current energy to AC energy is realized from inverter.

Under actual application scenarios, photovoltaic power generation is highly susceptible to the influence of the factors such as weather, the input of inverter The fluctuation of power at any time is very big.Moreover, inverter is in power grid end, it is easy to be influenced by weak grid.Therefore, inversion Device has to be adapted to the working condition that environmental change adjusts itself, avoid the occurrence of for example with input power increase and occur Otherwise phenomena such as net side over-voltage, will likely will lead to the frequent protection shutdown of inverter, and make generated energy by heavy losses.

In order to which the output voltage of inverter is maintained in target value required by power grid, currently used control strategy Mainly realized by adjusting the active power of inverter --- when the output voltage or power factor (Power of inverter Factor, PF) be more than certain numerical value when, according to fixed gradient reduce active power；Conversely, when inverter output voltage or When power factor is lower than certain numerical value, increase active power according to fixed gradient.Although in this way, can be realized to the defeated of inverter The control of voltage out, generated energy can but incur loss with the limitation to active power, be equivalent to through loss complete machine conversion Efficiency realizes the stabilization of output voltage, seriously constrains the performance and overall generating efficiency of inverter.

Summary of the invention

The application provides a kind of control method and device of inverter, inverter, computer readable storage medium, Ke Yiyou Effect reduces the complete machine transfer efficiency that inverter loses to adjust output voltage.

In a first aspect, the application provides a kind of control method of inverter, comprising:

When the ac output end of the inverter is connected with a grid integration point of power grid, the inverter is obtained Reactance value between ac output end and grid integration point；

It obtains between the reference value of the output voltage of the inverter and the value of feedback of the output voltage of the inverter Deviation；

When the output electric current of the inverter is less than the maximum allowable output electric current of the inverter, it is based on the reactance Value and the deviation, calculate that the active power in the inverter is constant and the output voltage of the inverter be intended to it is described The setting value of first parameter under conditions of reference value, first parameter is arranged according to the setting value；

Wherein, first parameter is the inverter parameter for the reactive power that can adjust the inverter.

The control method and device for the inverter that embodiments herein provides, inverter, computer readable storage medium, The reactance value for the power grid that can be connected when exporting electric current without departing from permissible range using inverter adjusts the nothing of inverter Function power realizes control to output voltage in the case where active power is constant, it is thus possible to effectively reduce inverter in order to The complete machine transfer efficiency for adjusting output voltage and losing facilitates the conversion performance for improving inverter, promotes the total of electricity generation system Body generating efficiency.

It is described to be based on the reactance value and the deviation in a possible design, calculate having in the inverter Function power is constant and the output voltage of the inverter is intended to the setting value of the first parameter under conditions of the reference value, with According to the setting value, first parameter is set, comprising:

Based on the reactance value and the deviation, calculating constant and described inverter in the active power of the inverter Output voltage be intended to the target value of the reactive component in the output electric current of the inverter under conditions of the reference value；

According to the target value of the reactive component in the output electric current of the inverter, the output electric current of the inverter is calculated In reactive component setting value, with according to the setting value be arranged the inverter output electric current in reactive component.

In the present embodiment, using the reactive component in the output electric current of inverter as above-mentioned first parameter, and by defeated The inner loop control of the reactive component in electric current realizes the outer loop control of the virtual value of output voltage out, not only may be implemented not lose The output voltage regulative mode of active power effectively reduces inverter to adjust output voltage and the complete machine conversion effect lost Rate, and there is lower algorithm complexity compared to the first parameter of other forms, have for other control framework There are higher dynamic responding speed and higher stability.

It is described to be based on the reactance value and the deviation in a possible design, calculate having in the inverter Function power is constant and the output voltage of the inverter is intended to the output electricity of the inverter under conditions of the reference value The target value of reactive component in stream, comprising:

Using the deviation divided by the opposite number of the quotient of the reactance value as the defeated of integration control or proportional plus integral control Enter, calculates the target of the reactive component in the output electric current of the inverter of integration control or proportional plus integral control output Value.

In the present embodiment, based on using the deviation divided by the opposite number of the quotient of the reactance value as integration control or ratio The control mode of example integration control, not only has smaller calculation amount, but also can adapt in electricity for other models The variation of the reactance value of net is effective against the reactance value variation of power grid to adverse effect caused by inverter, has higher Stability.

Based on the reactance value and the deviation, calculating constant and described inverter in the active power of the inverter Output voltage be intended to the setting value of the power factor of the inverter under conditions of the reference value, according to the setting value The power factor of the inverter is set.

In the present embodiment, using the power factor of inverter as above-mentioned first parameter, can based on power factor with it is defeated Relationship between reactive component in electric current out, identical control framework when realizing with output electric current as the first parameter.

In a possible design, between the ac output end and grid integration point for obtaining the inverter While reactance value, the resistance value between the ac output end of the inverter and grid integration point is obtained；The control Method further include:

When the output electric current of the inverter is greater than or equal to the maximum allowable output electric current of the inverter, it is based on institute Deviation, the resistance value, the reactance value and the maximum allowable output electric current are stated, the output electric current in the inverter is calculated It is intended under conditions of the reference value equal to the output voltage of the maximum allowable output electric current and the inverter described The setting value of first parameter, first parameter is arranged according to the setting value.

In the present embodiment, the situation of maximum allowable output electric current is greater than or equal to for output electric current, can be held in maximum Perhaps active point for exporting the preferential reactive component for adjusting output electric current of realization under the related limitation of electric current, corresponding to adjusting output electric current The control mode of amount, the i.e. change of reactive power prior to active power change, thus facilitate reduce adjust output voltage The loss of brought active power, the complete machine transfer efficiency for effectively reducing inverter and being lost to adjust output voltage.

It is described based on the deviation, the resistance value, the reactance value and the maximum appearance in a kind of possible design Perhaps it exports electric current, calculates the output electric current in the inverter and be equal to the maximum allowable output electric current and the inverter Output voltage is intended to the setting value of first parameter under conditions of the reference value, according to setting value setting described the One parameter, comprising:

Obtain the value of feedback of the active component and reactive component in the output electric current of the inverter；

Based on the deviation, the resistance value, the reactance value, the maximum allowable output electric current and the inverter Output electric current in reactive component value of feedback, calculate the inverter output electric current be equal to the maximum allowable output The output voltage of electric current and the inverter is intended under conditions of the reference value in the output electric current of the inverter The target value of reactive component；

According to the target value of the reactive component in the output electric current of the inverter, the output electric current of the inverter is calculated In reactive component setting value, with according to the setting value be arranged the inverter output electric current in reactive component；

According in the output electric current of the inverter the target value of reactive component, the maximum allowable output electric current and The value of feedback of active component in the output electric current of the inverter, calculates the active component in the output electric current of the inverter Setting value, with according to the setting value be arranged the inverter output electric current in active component.

In the present embodiment, using the reactive component in the output electric current of inverter as above-mentioned first parameter, and by defeated The inner loop control of the inner loop control of the reactive component in electric current and active component realizes the outer ring control of the virtual value of output voltage out System, not only may be implemented the output voltage regulative mode for not losing active power, effectively reduce inverter to adjust output electricity The complete machine transfer efficiency pressed and lost, and there is lower algorithm complexity compared to the first parameter of other forms, it compares There is higher dynamic responding speed and higher stability for other control framework.

In a kind of possible design, based on the deviation, resistance value, the reactance value, described maximum allowable defeated The value of feedback of reactive component in the output electric current of electric current and the inverter out, calculates the output electric current in the inverter It is intended under conditions of the reference value equal to the output voltage of the maximum allowable output electric current and the inverter described The target value of reactive component in the output electric current of inverter, comprising:

WithAs integration control or the input of proportional plus integral control, integral control is calculated The target value of reactive component in the output electric current of system or the inverter of proportional plus integral control output；

Wherein, Δ U_invFor the deviation, ω L is the reactance value, and R is the resistance value, i_qFor the defeated of the inverter The value of feedback of reactive component in electric current out, I_mFor the maximum allowable output electric current.

In the present embodiment, it is based on integration control or proportional plus integral control, is not only had more for other models Small calculation amount, and the reactance value that can adapt to be effective against power grid in the variation of the reactance value of power grid changes to inverter Caused adverse effect has higher stability.

Second aspect, the application also provide a kind of control device of inverter, comprising:

First obtains module, is connected for the ac output end in the inverter with a grid integration point of power grid When, obtain the reactance value between the ac output end of the inverter and grid integration point；

Second obtains module, for obtaining the reference value of the output voltage of the inverter and the output electricity of the inverter Deviation between the value of feedback of pressure；

First computing module is less than the maximum allowable output electricity of the inverter for the output electric current in the inverter When stream, it is based on the reactance value and the deviation, calculating constant and described inverter in the active power of the inverter Output voltage is intended to the setting value of the first parameter under conditions of the reference value, according to setting value setting first ginseng Amount；Wherein, first parameter is the inverter parameter for the reactive power that can adjust the inverter.

In a kind of possible design, first computing module includes:

First computing unit calculates the active power in the inverter for being based on the reactance value and the deviation The output voltage of the constant and described inverter is intended under conditions of the reference value in the output electric current of the inverter The target value of reactive component；

Second computing unit, for the target value of reactive component in the output electric current according to the inverter and described The value of feedback of reactive component in the output electric current of inverter, calculates setting for the reactive component in the output electric current of the inverter Definite value, with the reactive component being arranged in the output electric current of the inverter according to the setting value.

In a kind of possible design, first computing unit is further used for the deviation divided by the reactance value Quotient opposite number as integration control perhaps proportional plus integral control input calculate integration control or proportional plus integral control it is defeated The target value of reactive component in the output electric current of the inverter out.

In a kind of possible design, first computing module includes:

Second computing unit calculates the active power in the inverter for being based on the reactance value and the deviation The output voltage of the constant and described inverter is intended to setting for the power factor of the inverter under conditions of the reference value Definite value, the power factor of the inverter to be arranged according to the setting value.

In a kind of possible design, described first obtain module the ac output end for obtaining the inverter with it is described While reactance value between grid integration point, also obtain between the ac output end of the inverter and grid integration point Resistance value；The control device further include:

Second computing module is greater than or equal to the maximum allowable of the inverter for the output electric current in the inverter When exporting electric current, it is based on the deviation, the resistance value, the reactance value and the maximum allowable output electric current, is calculated in institute State inverter output electric current be equal to the maximum allowable output electric current and the inverter output voltage be intended to it is described The setting value of first parameter under conditions of reference value, first parameter is arranged according to the setting value.

In a kind of possible design, second computing module includes:

Acquiring unit, the value of feedback of the active component and reactive component in output electric current for obtaining the inverter；

First computing unit, for being based on the deviation, the resistance value, the reactance value, the maximum allowable output The value of feedback of reactive component in the output electric current of electric current and the inverter, calculates the output electric current etc. in the inverter It is intended in the output voltage of the maximum allowable output electric current and the inverter described inverse under conditions of the reference value Become the target value of the reactive component in the output electric current of device；

Second computing unit calculates institute for the target value of the reactive component in the output electric current according to the inverter The setting value of the reactive component in the output electric current of inverter is stated, the output electric current of the inverter to be arranged according to the setting value In reactive component；

Third computing unit, for according to the inverter output electric current in reactive component target value, it is described most The value of feedback for allowing to export the active component in the output electric current of electric current and the inverter greatly, calculates the defeated of the inverter The setting value of active component in electric current out, with active point be arranged in the output electric current of the inverter according to the setting value Amount.

In a kind of possible design, first computing unit is further used for:

The third aspect, the application also provide a kind of inverter, including an at least processor and an at least memory, it is described extremely For storing instruction, at least one described processor executes the inverter after executing described instruction to a few memory State the control method of any one.

Fourth aspect, the application also provide a kind of computer readable storage medium, which is characterized in that the computer Instruction is stored in readable storage medium storing program for executing, when run on a computer, so that computer executes the control of any one of the above Method processed.

Detailed description of the invention

Fig. 1 is a kind of application scenarios schematic diagram of inverter involved in embodiments herein；

Fig. 2 is a kind of connected mode schematic diagram of inverter involved in embodiments herein；

Fig. 3 is a kind of flow diagram of the control method of inverter involved in embodiments herein；

Fig. 4 is a kind of control block diagram of the control method of inverter involved in embodiments herein；

Fig. 5 is the setting of the first parameter of calculating in a kind of control method of inverter involved in embodiments herein The flow diagram of value；

Fig. 6 is the setting of the first parameter of calculating in a kind of control method of inverter involved in embodiments herein The flow diagram of value；

Fig. 7 is a kind of structural block diagram of the control device of inverter involved in embodiments herein；

Fig. 8 is the structural schematic diagram of the control unit in a kind of inverter involved by embodiments herein.

The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the application Example, and together with specification it is used to explain the principle of the application.

Specific embodiment

In order to keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with attached drawing to the application make into It is described in detail to one step, it is clear that described embodiment is only a part of the embodiment of the application, rather than whole implementation Example.

The inverter and application scenarios of embodiments herein description are the realities in order to more clearly illustrate the application The technical solution of example is applied, the restriction of the technical solution provided for embodiments herein, ordinary skill are not provided Personnel are it is found that with the differentiation of inverter structure and the appearance of new opplication scene, technical solution that embodiments herein provides It is equally applicable for similar technical problem.

Fig. 1 is a kind of application scenarios schematic diagram of inverter involved in embodiments herein.Referring to Fig. 1, inverter 100 are arranged in a photovoltaic generating system, and the photovoltaic array of electric energy can be conveyed to the direct-flow input end of inverter 100 (only using two photovoltaic group strings as example in Fig. 1) is formed by several photovoltaic group strings 200 are parallel with one another, each photovoltaic group string 200 are connected in series by several photovoltaic modulies 210.By collecting the energy of sunlight, photovoltaic group string 200 can be generated with straight Galvanic electricity signal is the electric energy of form, defeated based on the connection between each photovoltaic group string 200 and the direct-flow input end of inverter 100 It is sent at the direct-flow input end of inverter 100.The electric energy received at direct-flow input end can be converted to exchange by inverter 100 The electric energy of electrical signal form, and based on the connection between the grid integration of its ac output end and power grid 300 point, telecommunications will be exchanged The electrical energy transportation of number form is into power grid 300.The institute between 100 ac output end of inverter and the grid integration point of power grid 300 There are the structure or effect that can be had an impact to electric signal, an equivalent impedance 400 is equivalent in Fig. 1., it is understood that waiting The impedance value for imitating impedance 400 includes resistance value and reactance value, and wherein the size of reactance value is related with the frequency for flowing through electric signal.

It should be noted that the application scenarios of inverter shown in FIG. 1 are only a kind of examples, as several possible deformations Example, the direct-flow input end of above-mentioned inverter not only can renewable energy with for example above-mentioned photovoltaic array or non-renewable energy The power generator in source is connected, and can also be connected with the energy storage device of for example large-scale battery, or with such as DC-DC converter or The primary voltage converting means of person's AC-DC converter is connected.Certainly, the optional application scenarios of inverter are not limited to that.

In application scenarios shown in Fig. 1, grid integration point can not only be fixed in power grid to be connected with inverter Circuit node at position, and can be the circuit chosen according to the interaction situation between power grid 300 and inverter 100 Node.For example, can be generated to the performance of inverter for the ease of eliminating the impedance variations of the power grid when power grid is in weakness net characteristic It influences, grid integration point can be arranged in network voltage according to mode as shown in Figure 2Positive terminal at so that on The impedance value for stating equivalent impedance is equal to the electric network impedance Z=R+j ω L of power grid, and wherein R is the resistance value in electric network impedance, ω L For the reactance value in electric network impedance, j is imaginary unit (j²=-1).The output electric current of inverter is being expressed as i_d+ji_q(i_dFor The active component of electric current, i_qFor the reactive component of electric current), by network voltage according toMode when indicating, Can push away inverter output voltage--- hereinafter referred to as formula 1.1.

Since power grid has relatively-stationary requirement for the ac signal accessed, the output voltage of inverter Every parameter needs to be maintained in the state of electricity generation system work in predetermined range.For example, according to the mains voltage of power grid Output voltage should be maintained at 220V/50Hz or so by standard, the inverter for accessing the power generation end of utility grid, i.e. output voltage Virtual value should be maintained at 220V or so, and frequency should be maintained at 50Hz；Moreover, the stable operation in order to protect power grid, connects The inverter for entering power grid needs to trigger the movement of overvoltage protection or under-voltage protection when output voltage is excessive or too small.Fig. 1 as a result, Shown in inverter 100 need to be adapted to variation (such as each photovoltaic of working environment according to the relevant regulations of power grid 300 The generated output variation of photovoltaic array composed by group string 200), satisfactory output voltage is provided to power grid 300.

In a kind of comparative examples of output voltage for controlling inverter, inverter is to the control of output voltage by having The adjusting of function power is realized --- when the output voltage of inverter is more than certain numerical value, reduce output electricity according to fixed gradient The numerical value of the active component of stream, to reduce active power and output voltage；Conversely, the output voltage when inverter is lower than a fixed number When value, according to the numerical value of the active component of fixed gradient increase output electric current, to increase active power and output voltage.As a result, By adjusting the numerical value of the active component of output electric current in the case where other conditions are constant, which be can be realized to defeated The adjusting of voltage out, so that it be made to stablize in the numberical range of needs.But, it can be seen that the adjusting to watt current is essential On be that thus will cause the loss of generated energy in practical applications in the extent of deterioration of control electric energy.

Fig. 3 is a kind of flow diagram of the control method of inverter, the inversion involved in embodiments herein Device may, for example, be the inverter 100 in application scenarios as shown in Figure 1.Referring to Fig. 3, the control method includes:

Step 301, when the ac output end of inverter is connected with a grid integration point of power grid, obtain inverter Reactance value between ac output end and grid integration point.

Step 302, obtain inverter output voltage reference value and inverter output voltage value of feedback between Deviation.

Step 303, when the output electric current of inverter is less than the maximum allowable output electric current of inverter, based on reactance value and Deviation calculates the first ginseng under conditions of output voltage constant in the active power of inverter and inverter is intended to reference value The setting value of amount, the first parameter is arranged according to the setting value.

Wherein, the first parameter be inverter parameter, such as reactive power of the reactive power that can adjust inverter itself, Export reactive component, the power factor (Power Factor, PF) etc. of electric current.Since power grid is to the output voltage of inverter Numberical range requires usually using the virtual value of voltage as standard, therefore in without specific instruction, inverter herein Output voltage refers to its virtual value.

It should be understood that the virtual value of the output voltage of inverter is its active point in the case where application scenarios determine Amount square plus its reactive component square root sum square, above-mentioned reactance value meets the fundamental relation of above-mentioned formula 1.1, And it is determining that any one, which can adjust the relationship between the parameter and reactive power of the reactive power of inverter, therefore is tied Other necessary basic circuit parameter relationships are closed, the formula relationship between the first parameter and the output voltage of inverter can be pre- First determine.Herein basis on, can will be converted into the adjusting to the first parameter to the adjusting of output voltage, i.e., meet it is active The size for adjusting output voltage under the constant precondition of power by the first parameter of control (is equivalent to by controlling idle function Rate adjusts the size of output voltage), so that the output voltage of inverter is intended to reference value.

As can be seen that above-mentioned control method can be connected when exporting electric current without departing from permissible range using inverter The reactance value of power grid adjust the reactive power of inverter, control to output voltage is realized in the case where active power is constant System, it is thus possible to effectively reduce inverter to adjust output voltage and the complete machine transfer efficiency lost, help to improve inversion The conversion performance of device promotes the overall power generation efficiency of electricity generation system.

It should be noted that the electronic equipment of the executing subject as the control method should at least have following item Part: can obtain and directly or indirectly obtain the reactance value and the deviation, such as can be obtained according to the signal received Obtain these data；It can judge whether the output electric current of inverter is less than the maximum allowable output electric current of inverter, or The control signal thus triggered can be received；The reactive power of inverter can directly or indirectly be changed, such as can be led to It crosses and outputs a signal in the control circuit of inverter, so that control circuit controllably realizes the adjusting to reactive power.As A kind of example, the executing subject of the control method can be disposed on the single-chip microcontroller in inverter, and the processor of the single-chip microcontroller is logical It crosses and executes the instruction stored in memory in single-chip microcontroller operation, so that single-chip microcontroller executes the control method.As another kind Example, the executing subject of the control method can be disposed on the field programmable gate array (Field in inverter Programmable Gate Array, FPGA), which is being opened based on the connection in inverter between other circuit structures Data when beginning work in read in memory are to form internal logical operation relationship, according to the logical operation relationship by input Data export after carrying out logical operation, and act on the inverter bridge in inverter, to realize the execution to above-mentioned control method.

It should be noted that " setting value " referred to herein is the number that is used to indicate controlled variable and how should change Value is also possible to indicate that controlled variable should change either indicating the numerical value (aim parameter) that controlled variable should reach Numerical value (variable quantity).Moreover, " target value " referred to herein is intended to indicate that the numerical value how desired parameter changes, both It can be the numerical value (aim parameter) for indicating that expectation parameter reaches, be also possible to the numerical value (variable quantity) for indicating that expectation parameter changes. It will be appreciated that aim parameter subtracts datum quantity (numerical value before change) equal to variable quantity, therefore it can be based on this pass when necessary System introduces datum quantity carry out operation.For example, when the first parameter is arranged according to the setting value of variable quantity form, it is necessary When can first by its plus setting before the first parameter numerical value (datum quantity), obtain the numerical value (mesh that the first parameter should reach Scalar), then realize the setting of the first parameter.

It should be understood that the acquisition reactance value in above-mentioned steps 301 can for example pass through the ac output end in inverter Reactance value detects to realize in place, for example can read the data by being manually written in advance by pre-position in memory It realizes, can also for example be realized by receipt source in the data of the reactance value of external detection equipment.And in inverter When ac output end is not connected with the grid integration of any one power grid point, the executing subject of the control method can be not Know in the case where this situation still according to mode same when being connected with the ac output end of inverter with grid integration point into The acquisition of the above-mentioned reactance value of row, i.e. above-mentioned steps 301 might not the ac output end comprising detection inverter whether with power grid The connected process of a grid integration point.And the reactance value for getting, it can be by carrying out rational judgement to it Determine whether to carry out the adjusting in step 303 based on it.For example, when the impedance value detected at the ac output end of inverter In resistance value be greater than predetermined value (such as 10 megaohms) when, determine inverter ac output end open circuit, and abandon get Reactance value, so that it will not be used to carry out the operation in subsequent process.

It should be understood that the reference value of the output voltage of inverter described in above-mentioned steps 302 refers to output voltage Specified value or desired value, can for example be determined based on the requirement to get access to grid to inverter, and the feedback of output voltage Value refers to the parameter of the actual numerical value of reflection output voltage, such as the output voltage of actual measurement has at ac output end Valid value.In a kind of example, the virtual value of the output voltage of inverter can be subtracted by the reference value of the output voltage of inverter Obtain the deviation.It should be noted that above-mentioned steps 301 and step 302 can be above-mentioned in a kind of example in no particular order Reactance value obtains once every one section of regular time, and is used for the setting value of above-mentioned first parameter before obtain next time Calculating；And above-mentioned deviation obtains once before the calculating of the setting value of the first parameter each time.Certainly, reactance value obtains Removed can be according to the time cycle of regular length except, can also according to for example every time booting, every time shutdown etc. other Mode, and above several examples can be not limited only to.

It should be understood that above-mentioned steps 303 may, for example, be according to period (such as power frequency period or digital clock cycle) weight It carries out again, i.e., completes following processes within each period: setting for the first parameter is calculated according to the deviation and reactance value got Then the first parameter is arranged according to the setting value in definite value, so that inverter changes output state according to the setting value.In periodicity During duplicate, the setting value of the first parameter is constantly updated, and then the actual value of the first parameter in inverter real work Also constantly change, and reactive power is also changed correspondingly, output voltage is gradually intended to its reference value；That is, in each period The setting value for the first parameter being calculated, which does not always need to meet, can make output voltage be equal to its target value, or output electricity The condition of its target value variation is pressed against, output voltage is gradually intended to its reference value can be with as the control target of control system It is embodied in the master-plan of control system.

Fig. 4 is a kind of control block diagram of the control method of inverter involved in embodiments herein.The application is implemented Example is by taking the reactive component of the output electric current of the first parameter inverter as an example, the calculating of the main setting value for illustrating the first parameter Process.Referring to fig. 4, the present embodiment is generally idle point for exporting electric current by control unit 10 by calculating output inverter Measure i_qSetting value, and by execution unit 20 according to i_qSet value calculation inverter output voltage, and by the anti-of output voltage Feedback value returns to control unit 10, is formed about output voltage U_invVirtual value control system.

For clear control principle, model used by control system is illustrated first.As it was noted above, for example scheming In circuit model shown in 2, grid integration point is arranged in network voltagePositive terminal at, the impedance value of above-mentioned equivalent impedance It is equal to the electric network impedance Z=R+j ω L of power grid, wherein R is the resistance value in electric network impedance, and ω L is the reactance in electric network impedance Value, j are imaginary unit (j²=-1).The output electric current of inverter is being expressed as i_d+ji_q(i_dFor the active component of electric current, i_qFor The reactive component of electric current), by network voltage according to(U_gdFor the active component of electric current, U_gqFor the nothing of electric current Function component) mode when indicating, can push away inverter output voltage --- formula 1.1.Based on formula 1.1, formula 1.2 directly can be pushed away to obtain by multinomial operation:

According to the definition of voltage effective value, formula 1.3 can be pushed away to obtain according to formula 1.2:

Output voltage is obtained as a result,With reactance value ω L and the first parameter i_qBetween relationship.In formula 1.3 In, network voltageIt is to be determined by power grid, fixed value constant at any time can be considered as；Resistance value R and reactance value ω L Fixed value constant at any time can be considered as the power grid having determined under application scenarios；And in the output of inverter electricity Stream is less than under the scene of the maximum allowable output electric current of the inverter, and the condition that the active power of inverter is constant makes i_d? It does not change over, it is possible thereby to which formula 1.4 can be obtained by the operation of both sides time differential:

ΔU_inv=(- ω L) Δ i_q

That is, under the premise of the output electric current of inverter is less than the maximum allowable output electric current of the inverter, enough In short a period of time, can by make inverter output electric current in reactive component changes delta i_q, to make the defeated of inverter Voltage change (- ω L) Δ i out_q., whereas if needing to make inverter within a period of time short enough under the premise of above-mentioned Output voltage changes delta U_inv, then the reactive component changes delta U exported in electric current by making inverter_inv/ (- ω L) can be with It realizes.

Based on above-mentioned model, control system shown in Fig. 4 is as described below:

Referring to fig. 4, execution unit 20 can get the anti-of output voltage for example, by the mode that voltage effective value detects Feedback value, to be input in control unit 10.Within a control period, control unit 10 calculates the reference value of output voltage U^* _invDifference between the value of feedback of output voltage, and the deviation delta U that will be obtained_invIt is input to gain and offsets link 11.By The output electric current of inverter is less than the judgement of the maximum allowable output electric current of inverter, and control unit 10 determines that yield value Gain is The opposite number (- ω L) of above-mentioned reactance value, thus exports the deviation delta U of input_invThe quotient's Δ obtained divided by yield value (- ω L) U_inv/(-ωL).According to above-mentioned model it is found that Δ U_inv/ (- ω L) is equal to Δ i_q, i.e., it is actually to increase that gain, which offsets link 11, The deviation of the output voltage of inverter is converted to the deviation of reactive component in the output electric current of inverter for bridge by beneficial value.Increase Benefit offsets input of the output of link 11 as integration control link 12, with transmission function G (S)=K_i/ S carries out integration control (K_i For integral coefficient, can be preset by theoretical calculation, estimation such as the practical measurement process of adjusting), become The target value Δ i of reactive component in the output electric current of the inverter of change amount form_q ^*.The Δ i that integration control link 12 exports_q ^*It is defeated Enter into current control link 13, is based on the first parameter i_qValue of feedback and target value Δ i_q ^*, can be formed not in Fig. 4 in detail The closed loop current control shown, exports the first parameter i of variable quantity form_qSetting value Δ i_qInto execution unit 20.Certainly, In the closed loop current control that input quantity and output quantity only relate to variable quantity, it may not be necessary to the first parameter i_qValue of feedback (datum quantity) participates in operation.In Fig. 4, current control link 13 is with transmission function G (s)=e^-TsTime Delay indicate, T be pair The delay time parameter answered, corresponding current control the response delay of environment.

In a kind of example, for execution unit 20, the instruction that is received from control unit 10 as shown in Figure 4 Being equivalent to " will export the active component i of electric current_dSetting value remain unchanged, the reactive component i of electric current will be exported_qSetting value become More specified numerical value ", thus can execute according to this and keep i_dIt is constant and by i_qIt is adjusted according to the setting value of variable quantity form.Certainly, Based on relationship listed by above-mentioned formula 1.3 and formula 1.4, aforesaid operations will make i naturally_qSetting value Δ i_qBy gain The multiplication operation of yield value Gain in link 21 with size equal to (- ω L), becomes (- ω L) Δ i in formula 1.4_qOne, And then obtain the setting value Δ U of output voltage_inv, with the numerical value U before the output voltage setting that is added to_inv0In (a reference value), thus It is formed completely to output voltage U_invClosed-loop control.

As can be seen that control system as shown in Figure 4 can be realized and above-mentioned calculate the first parameter based on reactance value and deviation Setting value process, while the control system realized can be by i_qInner loop control realize output voltage U_invIt is effective The outer loop control of value the output voltage regulative mode for not losing active power not only may be implemented compared to existing way, effectively The complete machine transfer efficiency that inverter loses to adjust output voltage is reduced, and can adapt in the change of the reactance value of power grid Change, is effective against the reactance value variation of power grid to adverse effect caused by inverter, there is higher stability.

It should be noted that can be configured the control process in integration control link 12 in above-mentioned control system Such as the control process of proportional plus integral control, PID control parameter etc., to realize similar control system.For example, Can by proportional plus integral control (transmission function be G (S)=K_p+K_i/ S, K_pIt, can be with integral coefficient K for proportionality coefficient_iIt is logical in advance The process for crossing parameter tuning is configured) realize integration control link 12.Actual test shows integration control and proportional integration control Difference is little in the control effect of system, but integration control obviously has smaller calculation amount for proportional plus integral control. For example, in above-mentioned steps 303 based on reactance value and deviation, calculate that active power in inverter is constant and inverter it is defeated Voltage is intended to the setting value of the first parameter under conditions of reference value out, the first parameter is arranged according to the setting value, can have Body includes following step as shown in Figure 5:

Step 501 is based on the reactance value and the deviation, calculate the inverter active power is constant and institute The output voltage for stating inverter is intended to reactive component in the output electric current of the inverter under conditions of the reference value Target value.

For example, using deviation divided by the opposite number of the quotient of reactance value as integration control or the input of proportional plus integral control, Calculate the target value of the reactive component in the output electric current of the inverter of integration control or proportional plus integral control output.In Fig. 4 Gain offsets link 11 and integration control link 12 is a kind of example of the above process.Wherein, the constant condition of active power Be embodied in the determination of yield value Gain, output voltage be intended to reference value be embodied in output voltage as input quantity with And in the overall architecture of other control system, it is described below and conditional calculating be in this regard it is identical, thus It repeats no more.

Step 502, the value of feedback for exporting the reactive component in electric current for obtaining the inverter.

For example, setting is used for the structure of current detecting, and base on the positive access for passing through the ac output end in inverter I is realized in communication or connection relationship between the structure and control unit 10_qValue of feedback acquisition.For another example, inverse based on other The value of feedback for becoming device parameter extrapolates i according to the relationship between parameter_qValue of feedback, such as the value of feedback based on output voltage, i_d Value of feedback, actual measurement resistance value R and reactance value ω L extrapolate i_qValue of feedback.Certainly, i_qValue of feedback acquisition side Formula can be not limited only to above example.It should be understood that not needing the first parameter i in closed loop current control_qValue of feedback (base Quasi- amount) participate in operation when, above-mentioned steps 502 can be removed.

Step 503, the target value for exporting the reactive component in electric current according to the inverter, calculate the inverter The setting value of the reactive component in electric current is exported, with idle point be arranged in the output electric current of the inverter according to the setting value Amount.

Current control link 13 and i in Fig. 4_qSetting value transmission process be the step 503 a kind of example, herein It repeats no more.Wherein, calculating setting value based on value of feedback and target value with the optional way for realizing closed-loop automatic control is ability Known to field technique personnel, details are not described herein.

It, can be using cell power factor as the first parameter as another implementation example of the embodiment of the present application Realize the control method of inverter.In above-mentioned steps 303 based on reactance value and deviation, calculate inverter active power not The output voltage of change and inverter is intended to the setting value of the first parameter under conditions of reference value, to be arranged according to the setting value First parameter can specifically include: be based on reactance value and deviation, calculate inverter active power is constant and inverter Output voltage is intended to the setting value of the power factor of inverter under conditions of reference value, inverter is arranged according to the setting value Power factor.As an example, based on the definition of power factor, power factor PF and i are obtained_qBetween corresponding close System --- formula 1.7:

Based on above formula, since the output electric current in inverter is less than the scene of the maximum allowable output electric current of the inverter Under, the condition that the active power of inverter is constant makes i_dIt does not change over, therefore formula 1.7 is bound to formula 1.3 yet In (the i that will be occurred_qAll changing is indicated by PF), so as to obtain the expression formula of corresponding model and yield value, then may be used To realize that the first parameter as the control method of cell power factor, is no longer gone to live in the household of one's in-laws on getting married herein according to referring to control system as shown in Figure 4 It states.

Compare that the first parameter is PF and the first parameter is i_qExample can be seen that i_qNot only in the expression formula of yield value It is more succinct, and determine that PF cannot reflect i by formula 1.7_qIt is just or negative, therefore uses the first parameter for i_qRealization Mode is more advantageous to the complexity for reducing algorithm.

It should also be noted that, being greater than or equal to the maximum allowable output electric current of inverter for the output electric current of inverter Situation, the control unit 10 in control system shown in Fig. 4 is equally applicable.Only because i under the situation_qAdjustable range by Limitation is arrived, therefore above-mentioned formula 1.4 and its yield value Gain being derived are equal to the opposite number (- ω L) of above-mentioned reactance value Relationship all no longer be applicable in.According to output electric current maximum allowable under this situationRestrictive condition, Formula 1.5 can be pushed away to obtain according to formula 1.3:

Then by the operation of both sides time differential, formula 1.6 is obtained:

More afterwards as can be seen that relative to the situation without departing from current limit, the situation beyond current limit only needs Yield value Gain change accordingly according to above-mentioned formula 1.6, similar control system can be realized.That is, in above-mentioned gain It offsets in link 11, the judgement of the maximum allowable output electric current of inverter, control is greater than or equal to by the output electric current of inverter Component 10 processed determines that yield value Gain isThus the deviation delta U of input is exported_invDivided by yield value The quotient that Gain is obtainedIt can easily be seen that not only needing above-mentioned reactance in this calculating process The deviation delta U of value ω L and input_invParticipate in operation, it is also necessary to resistance value R, maximum allowable output electric current I_mAnd i at this time_qNumber Value (can for example pass through i_qValue of feedback indicate) participate in operation together, these numerical value of parameter for participating in operations require in advance It obtains.Based on this, gain offsets the numerical value of the output of link 11 after integration control link 12 and current control link 13, can To obtain the i in the form of the variable quantity under current limit condition_qSetting value Δ i_q, to be output in execution unit 20.In addition, Due to i under the conditions of current limitation_dWith i_qMetIt is required that i_dWith i_qSynchronous variation, thus it is shown in Fig. 4 On the basis of control system, it is also necessary to add not shown i_dControlling unit.It in one example, can be by i_qTarget Value i_q ^*The i of aim parameter form is calculated_dTarget valueTo be based on i_dValue of feedback and target value i_d ^*, the closed loop current control not being shown specifically in Fig. 4 is formed, i is exported_dSetting value into execution unit 20.

In a kind of example, for execution unit 20, the instruction received from control unit 10 is equivalent to " will be defeated The active component i of electric current out_dSetting value change specified numerical value, the reactive component i of electric current will be exported_qSetting value be changed to refer to Fixed number value ", thus can execute i according to this_dChange to the setting value of its aim parameter form and according to the setting value of variable quantity form Δi_qAdjust i_qOperation.Certainly, based on relationship listed by above-mentioned formula 1.6, aforesaid operations will be according to mode shown in Fig. 4 By i_qSetting value be converted to the setting value of output voltage, and be consequently formed completely to output voltage U_invVirtual value close Ring control.

It can be seen that being greater than or equal to the situation of maximum allowable output electric current for output electric current, the application is implemented Example can realize preferential adjusting i under the maximum allowable related limitation for exporting electric current_q, corresponding adjust i_dControl mode, i.e., it is idle The change of power prior to active power change, thus facilitate reduce adjust output voltage brought by active power damage It loses, effectively reduces inverter to adjust output voltage and the complete machine transfer efficiency lost.In addition, control system as described above In contrast there is higher dynamic responding speed and higher stability, and the over-voltage of inverter can be effectively prevented.More Generally, the control method that can obtain said effect only needs on the basis of above-mentioned steps 301 to step 303, further includes one Step 304 not shown in FIG. 3 is greater than or equal to the maximum allowable output electric current of inverter in the output electric current of inverter When, it is based on deviation, resistance value, reactance value and maximum allowable output electric current, the output electric current calculated in inverter is equal to maximum hold Perhaps the output voltage of output electric current and inverter is intended to the setting value of the first parameter under conditions of reference value, to set according to this The first parameter is arranged in definite value；And make above-mentioned steps 301 between the ac output end and grid integration point for obtaining inverter Resistance value while reactance value, also between the ac output end and grid integration point of acquisition inverter.That is, according to each parameter it Between relationship, formula relationship between the first parameter and the output voltage of inverter under the restrictive condition of maximum allowable output electric current It can be determined in advance, herein on basis, can will be converted into the adjusting to the first parameter to the adjusting of output voltage, that is, exist Meet output electric current and output voltage is adjusted by the first parameter of control equal under the precondition of maximum allowable output electric current Size (is equivalent to through control reactive power and active power the size for adjusting output voltage), makes the output voltage of inverter It is intended to reference value.It is understood that the measurement of reactance value can carry out simultaneously with the measurement of resistance value, i.e., it is above-mentioned any one The process that kind obtains reactance value can be specially to obtain the process of impedance value (comprising reactance value and resistance value).

As an example, in above-mentioned steps 304 based on deviation, resistance value, reactance value and maximum allowable output electric current, The output electric current calculated in inverter is intended to reference value equal to the output voltage of maximum allowable output electric current and inverter Under the conditions of the first parameter setting value, with according to the setting value be arranged the first parameter, step as illustrated in FIG. 6 can be specifically included It is rapid:

Step 601, the value of feedback for exporting active component and reactive component in electric current for obtaining inverter.

For example, setting is used for the structure of current detecting, and base on the positive access for passing through the ac output end in inverter I is realized in communication or connection relationship between the structure and control unit 10_qValue of feedback and i_dValue of feedback acquisition.For another example, Value of feedback based on other inverter parameters extrapolates i according to the relationship between parameter_qValue of feedback and/or i_dValue of feedback, example Value of feedback, i such as based on output voltage_dValue of feedback, actual measurement resistance value R and reactance value ω L extrapolate i_qFeedback Value.Certainly, i_qValue of feedback acquisition modes and i_dThe acquisition modes of value of feedback can be identical or different, and can not only limit In above example.

In step 602, the output electric current based on deviation, resistance value, reactance value, maximum allowable output electric current and inverter Reactive component value of feedback, the output electric current calculated in inverter is equal to the maximum allowable output electric current and inverter Output voltage is intended to the target value for exporting the reactive component in electric current of inverter under conditions of reference value.

Such as it is described above, withAs the defeated of integration control or proportional plus integral control Enter, calculates the target of the reactive component in the output electric current of the inverter of integration control or proportional plus integral control output Value.Yield value is in Fig. 4Gain to offset link 11 and integration control link 12 be the above process A kind of example.Wherein, the condition that output electric current is equal to the maximum allowable output electric current has been embodied in yield value Gain's In determination, output voltage is intended to reference value and has been embodied in output voltage as input quantity and the integrated stand of other control system On structure, it is described below and the calculating of conditional be identical in this regard, thus repeat no more.

Step 603, the target value for exporting the reactive component in electric current according to inverter, calculate the output electric current of inverter In reactive component setting value, with according to the setting value setting inverter output electric current in reactive component.

Step 604, the target value of reactive component according in the output electric current of inverter, maximum allowable output electric current and The value of feedback of active component in the output electric current of inverter, calculates the setting of the active component in the output electric current of inverter Value, according to the active component in the output electric current of setting value setting inverter.

Current control link 13 and i in Fig. 4_qSetting value transmission process be the step 603 and step 604 one kind Example, details are not described herein.Wherein, setting value is calculated to realize the optional side of closed-loop automatic control based on value of feedback and target value Formula is well-known to those skilled in the art, the i of realization execution unit 20_qAnd i_dThe optional way of controlled adjustment be also ability Known to field technique personnel, repeat no more herein.It should be understood that the execution sequence between step 603 and step 604 can To be arbitrarily arranged, and can be in no particular order.

Based on same inventive concept, Fig. 7 is a kind of control device of inverter involved in embodiments herein Structural block diagram.Referring to Fig. 7, the control device of the inverter of the present embodiment includes:

First obtains module 71, is connected for the ac output end in the inverter with a grid integration point of power grid When, obtain the reactance value between the ac output end of the inverter and grid integration point；

Second obtains module 72, for obtaining the reference value of the output voltage of the inverter and the output of the inverter Deviation between the value of feedback of voltage；

First computing module 73 is less than the maximum allowable output of the inverter for the output electric current in the inverter When electric current, it is based on the reactance value and the deviation, calculating constant and described inverter in the active power of the inverter Output voltage be intended to the setting value of the first parameter under conditions of the reference value, according to setting value setting described first Parameter.

As can be seen that above-mentioned control device can be connected when exporting electric current without departing from permissible range using inverter The reactance value of power grid adjust the reactive power of inverter, control to output voltage is realized in the case where active power is constant System, it is thus possible to effectively reduce inverter to adjust output voltage and the complete machine transfer efficiency lost, help to improve inversion The conversion performance of device promotes the overall power generation efficiency of electricity generation system.

In a kind of possible design, first computing module 73 is specifically included:

In a kind of possible design, first computing module 73 includes the second computing unit, and the second computing unit is used In being based on the reactance value and the deviation, calculate that active power in the inverter is constant and the output of the inverter Voltage is intended to the setting value of the power factor of the inverter under conditions of the reference value, institute is arranged according to the setting value State the power factor of inverter.

In a kind of possible design, described first obtains module 71 in ac output end and the institute for obtaining the inverter While stating the reactance value between grid integration point, also obtain the inverter ac output end and the grid integration point it Between resistance value；The control device further includes unshowned second computing module 74 in Fig. 7, and second computing module 74 is used In when the output electric current of the inverter is greater than or equal to the maximum allowable output electric current of the inverter, it is based on described inclined Poor, the described resistance value, the reactance value and the maximum allowable output electric current, the output electric current calculated in the inverter are equal to The output voltage of the maximum allowable output electric current and the inverter is intended to described first under conditions of the reference value The setting value of parameter, first parameter is arranged according to the setting value.

In a kind of possible design, second computing module 74 includes:

In a kind of possible design, first computing unit is further used for:

Device in this present embodiment is closed, wherein modules and unit execute the concrete mode of operation in interested party It is described in detail in the embodiment of method, no detailed explanation will be given here.

Based on same inventive concept, Fig. 8 is the control unit in a kind of inverter involved by embodiments herein Structural schematic diagram, the inverter include an at least processor and an at least memory, and at least one processor is for depositing Storage instruction, at least one described processor execute the controlling party for making the inverter execute any one of the above after described instruction Method.In Fig. 8, an at least processor 801 and a memory 803 are arranged in control unit 800；In addition to this, control unit 800 further include bus 80 and at least one communication interface 804.

Processor 801 may include general central processor (CPU), microprocessor, application-specific integrated circuit (Application-Specific Integrated Circuit, ASIC), at digital signal processor (DSP), digital signal Equipment (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), controller, microcontroller are managed, or Multiple integrated circuits executed for controlling program.

Bus 802 is mainly used for transmitting information between the other assemblies of control unit 800.The communication interface 804 is main It is used for that (for example communication interface 804 includes the interface for connecting execution unit, in the interface with other electronic device communications Realize that control unit sends the function of the setting value of the first parameter to execution unit when being connected with execution unit), in communication interface 804 be network interface when, the network accessed may, for example, be Ethernet, wireless access network (RAN), WLAN (WirelessLocal Area Networks, WLAN) etc..

Memory 803 may include read-only memory (Read-Only Memory, ROM) or can store static information and refer to The other kinds of static storage device enabled, random access memory (Random Access Memory, RAM) or can store The other kinds of dynamic memory of information and instruction, also may include Electrically Erasable Programmable Read-Only Memory (ElectricallyErasable Programmable Read-Only Memory, EEPROM), CD-ROM (Compact Disc Read-OnlyMemory, CD-ROM) or other optical disc storages, optical disc storage (including compression optical disc, laser disc, optical disc, Digital Versatile Disc, Blu-ray Disc etc.), magnetic disk storage medium or other magnetic storage apparatus or can be used in carrying or deposit Any other medium that stores up the desired program code with instruction or data structure form and can be accessed by control unit, but It is without being limited thereto.Memory, which can be, to be independently arranged, and can also be integrated with processor.

Wherein, the memory 803 is for storing executable code, and execution is controlled by processor 801.The processing Device 801 is for executing the executable code stored in the memory 803.

In the concrete realization, as one embodiment, processor 801 may include one or more CPU, such as in Fig. 8 CPU0 and CPU1.

In the concrete realization, as one embodiment, control unit 800 may include multiple processors, such as in Fig. 8 Processor 801 and processor 808.Each of these processors can be monokaryon (single-CPU) processor, It can be multicore (multi-CPU) processor.Here processor can refer to one or more equipment, circuit, and/or use In the processing core of processing data (such as computer program instructions).

In the concrete realization, as one embodiment, control unit 800 can also include that output equipment 805 and input are set Standby 806.Output equipment 805 and processor 801 communicate, and can show information in many ways.For example, output equipment 805 can To be liquid crystal display (Liquid Crystal Display, LCD), Light-Emitting Diode (Light Emitting Diode, LED equipment) is shown, cathode-ray tube (Cathode Ray Tube, CRT) shows equipment or projector (Projector) etc.. Processor 801 can be communicated by bus 802 between input equipment 806, can receive the input of user in many ways.For example, Input equipment 806 can be mouse, keyboard, touch panel device or sensing equipment etc..

Above-mentioned control unit 800 can be a general controls component or a dedicated control unit.Specific real In existing, control unit 800 can be desktop computer, portable computer, network server, palm PC (Personal Digital Assistant, PDA), cell phone, tablet computer, wireless terminal device, communication equipment, embedded device or similar structures Equipment.Embodiments herein does not limit the type of control unit 800.

It should be noted that control unit shown in Fig. 8 is only to give the possible hardware implementation mode of each section, According to the difference or variation of system components function, additions and deletions can be carried out to the hardware component of control unit, so that with being The function of system each section is matched.

In the corresponding embodiment of Fig. 7, control device is presented in the form of functional unit/functional module.Here " units/modules " can refer to application-specific integrated circuit (Application Specific Integrated Circuit, ASIC) circuit, executes the processor and memory of one or more softwares or firmware program, integrated logic circuit and/or other The device of above-mentioned function can be provided.In a simple embodiment, the equipment for realizing control device can have shown in Fig. 8 Form.Illustratively, the first acquisition module 71, second obtains any one in module 72 and the function of the first computing module 73 It is a or multiple can be realized by being executed by a processor the program code stored in memory.

Embodiments herein additionally provides a kind of computer readable storage medium, the computer readable storage medium In be stored with instruction, when run on a computer, so that computer executes the control method of any one of the above.For example, It is computer software used that the computer readable storage medium, which can be used for being stored as above-mentioned control device shown in Fig. 7, Instruction, it includes for executing program designed by above-mentioned control method embodiment.By executing the program of storage, may be implemented The control method of inverter provided by the present application.

Although the application is described in conjunction with each embodiment herein, however, implementing the application claimed In the process, those skilled in the art are by checking the attached drawing, disclosure and the appended claims, it will be appreciated that and it is real Other variations of the existing open embodiment.In the claims, one word of " comprising " is not excluded for other components or step, "a" or "an" is not excluded for multiple situations.Single processor or other units may be implemented to enumerate in claim several Item function.Mutually different has been recited in mutually different dependent certain measures, it is not intended that these measures cannot group close To generate good effect.

It will be understood by those skilled in the art that embodiments herein can provide as method, apparatus (equipment) or computer journey Sequence product.Therefore, complete hardware embodiment, complete software embodiment or combining software and hardware aspects can be used in the application The form of embodiment.Moreover, it wherein includes the calculating of computer usable program code that the application, which can be used in one or more, The computer program implemented in machine usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) The form of product.Computer program is stored/distributed in suitable medium, is provided together with other hardware or as the one of hardware Part can also use other distribution forms, such as pass through internet or other wired or wireless telecommunication systems.

The application is the flow chart of method, apparatus (equipment) and computer program product referring to embodiments herein And/or block diagram describes.It should be understood that each process in flowchart and/or the block diagram can be realized by computer program instructions And/or the combination of the process and/or box in box and flowchart and/or the block diagram.It can provide these computer programs to refer to Enable the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to generate One machine so that by the instruction that the processor of computer or other programmable data processing devices executes generate for realizing The device for the function of being specified in one or more flows of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates, Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or The function of being specified in multiple boxes.

These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one The step of function of being specified in a box or multiple boxes.

The foregoing is merely the alternative embodiments of the application, not to limit the application, it is all in spirit herein and Within principle, any modification, equivalent replacement, improvement and so on be should be included within the scope of protection of this application.

Claims

1. a kind of control method of inverter characterized by comprising

When the ac output end of the inverter is connected with a grid integration point of power grid, the exchange of the inverter is obtained Reactance value between output end and grid integration point；

Obtain the deviation between the reference value of the output voltage of the inverter and the value of feedback of the output voltage of the inverter；

When the output electric current of the inverter is less than the maximum allowable output electric current of the inverter, based on the reactance value and The deviation, in the active power of the inverter, the output voltage of the constant and described inverter is intended to the reference for calculating The setting value of first parameter under conditions of value, first parameter is arranged according to the setting value；

2. control method according to claim 1, which is characterized in that described to be based on the reactance value and the deviation, meter It calculates under conditions of in the active power of the inverter, the output voltage of the constant and described inverter is intended to the reference value The setting value of first parameter, first parameter is arranged according to the setting value, comprising:

Based on the reactance value and the deviation, calculate that active power in the inverter is constant and the inverter it is defeated Voltage is intended to the target value for exporting the reactive component in electric current of the inverter under conditions of the reference value out；

According to the target value of the reactive component in the output electric current of the inverter, calculate in the output electric current of the inverter The setting value of reactive component, with the reactive component being arranged in the output electric current of the inverter according to the setting value.

3. control method according to claim 2, which is characterized in that described to be based on the reactance value and the deviation, meter It calculates under conditions of in the active power of the inverter, the output voltage of the constant and described inverter is intended to the reference value The target value of reactive component in the output electric current of the inverter, comprising:

It is counted using the deviation divided by the opposite number of the quotient of the reactance value as integration control or the input of proportional plus integral control Calculate the target value of the reactive component in the output electric current of the inverter of integration control or proportional plus integral control output.

4. control method according to claim 1, which is characterized in that described to be based on the reactance value and the deviation, meter It calculates under conditions of in the active power of the inverter, the output voltage of the constant and described inverter is intended to the reference value The setting value of first parameter, first parameter is arranged according to the setting value, comprising:

Based on the reactance value and the deviation, calculate that active power in the inverter is constant and the inverter it is defeated Voltage is intended to the setting value of the power factor of the inverter under conditions of the reference value out, to be arranged according to the setting value The power factor of the inverter.

5. control method according to any one of claim 1 to 4, which is characterized in that in the friendship for obtaining the inverter While flowing the reactance value between output end and grid integration point, obtain the inverter ac output end and it is described simultaneously Resistance value between net access point；The control method further include:

When the output electric current of the inverter is greater than or equal to the maximum allowable output electric current of the inverter, based on described inclined Poor, the described resistance value, the reactance value and the maximum allowable output electric current, the output electric current calculated in the inverter are equal to The output voltage of the maximum allowable output electric current and the inverter is intended to described first under conditions of the reference value The setting value of parameter, first parameter is arranged according to the setting value.

6. control method according to claim 5, which is characterized in that it is described based on the deviation, it is the resistance value, described Reactance value and the maximum allowable output electric current, the output electric current calculated in the inverter are equal to the maximum allowable output electricity Flow and the output voltage of the inverter be intended to the setting value of first parameter under conditions of the reference value, with according to First parameter is arranged in the setting value, comprising:

Based on the defeated of the deviation, the resistance value, the reactance value, the maximum allowable output electric current and the inverter The value of feedback of reactive component in electric current out, the output electric current calculated in the inverter are equal to the maximum allowable output electric current And the output voltage of the inverter is intended to idle in the output electric current of the inverter under conditions of the reference value The target value of component；

According to the target value of the reactive component in the output electric current of the inverter, calculate in the output electric current of the inverter The setting value of reactive component, with the reactive component being arranged in the output electric current of the inverter according to the setting value；

According to the target value of reactive component in the output electric current of the inverter, the maximum allowable output electric current and described The value of feedback of active component in the output electric current of inverter, calculates setting for the active component in the output electric current of the inverter Definite value, with the active component being arranged in the output electric current of the inverter according to the setting value.

7. control method according to claim 6, which is characterized in that be based on the deviation, the resistance value, the reactance The value of feedback of reactive component in the output electric current of value, the maximum allowable output electric current and the inverter, calculates in institute State inverter output electric current be equal to the maximum allowable output electric current and the inverter output voltage be intended to it is described The target value of reactive component under conditions of reference value in the output electric current of the inverter, comprising:

WithAs integration control or the input of proportional plus integral control, calculate integration control or The reference value of reactive component in the output electric current of the inverter of person's proportional plus integral control output；

Wherein, Δ U_invFor the deviation, ω L is the reactance value, and R is the resistance value, i_qFor the output electricity of the inverter The value of feedback of reactive component in stream, I_mFor the maximum allowable output electric current.

8. a kind of control device of inverter characterized by comprising

First acquisition module obtains when being connected for the ac output end in the inverter with a grid integration point of power grid Take the reactance value between the ac output end of the inverter and grid integration point；

Second obtains module, for obtaining the reference value and the output voltage of the inverter of the output voltage of the inverter Deviation between value of feedback；

First computing module is less than the maximum allowable output electric current of the inverter for the output electric current in the inverter When, be based on the reactance value and the deviation, calculate that active power in the inverter is constant and the inverter it is defeated Voltage is intended to the setting value of the first parameter under conditions of the reference value out, according to setting value setting first ginseng Amount；Wherein, first parameter is the inverter parameter for the reactive power that can adjust the inverter.

9. control device according to claim 8, which is characterized in that first computing module includes:

First computing unit, for being based on the reactance value and the deviation, calculating is constant in the active power of the inverter And the output voltage of the inverter is intended to idle in the output electric current of the inverter under conditions of the reference value The target value of component；

Second computing unit calculates described inverse for the target value of the reactive component in the output electric current according to the inverter Become the setting value of the reactive component in the output electric current of device, to be arranged in the output electric current of the inverter according to the setting value Reactive component.

10. control device according to claim 9, which is characterized in that first computing unit is further used for institute Deviation is stated divided by the opposite number of the quotient of the reactance value as integration control or the input of proportional plus integral control, calculates integral control The target value of reactive component in the output electric current of system or the inverter of proportional plus integral control output.

11. control device according to claim 8, which is characterized in that first computing module includes:

Second computing unit, for being based on the reactance value and the deviation, calculating is constant in the active power of the inverter And the output voltage of the inverter is intended to the setting value of the power factor of the inverter under conditions of the reference value, The power factor of the inverter to be arranged according to the setting value.

12. the control device according to any one of claim 8 to 11, which is characterized in that the first acquisition module exists While obtaining the reactance value between the ac output end of the inverter and grid integration point, the inverter is also obtained Ac output end and grid integration point between resistance value；The control device further include:

Second computing module is greater than or equal to the maximum allowable output of the inverter for the output electric current in the inverter When electric current, it is based on the deviation, the resistance value, the reactance value and the maximum allowable output electric current, is calculated described inverse The output electric current for becoming device is equal to the maximum allowable output electric current and the output voltage of the inverter is intended to the reference The setting value of first parameter under conditions of value, first parameter is arranged according to the setting value.

13. control device according to claim 12, which is characterized in that second computing module includes:

First computing unit, for being based on the deviation, the resistance value, the reactance value, the maximum allowable output electric current And the value of feedback of the reactive component in the output electric current of the inverter, the output electric current calculated in the inverter are equal to institute The output voltage for stating maximum allowable output electric current and the inverter is intended to the inverter under conditions of the reference value Output electric current in reactive component target value；

Second computing unit calculates described inverse for the target value of the reactive component in the output electric current according to the inverter Become the setting value of the reactive component in the output electric current of device, to be arranged in the output electric current of the inverter according to the setting value Reactive component；

Third computing unit, target value, the maximum appearance for the reactive component in the output electric current according to the inverter Perhaps the value of feedback for exporting the active component in the output electric current of electric current and the inverter calculates the output electricity of the inverter The setting value of active component in stream, with the active component being arranged in the output electric current of the inverter according to the setting value.

14. control device according to claim 13, which is characterized in that first computing unit is further used for:

WithAs integration control or the input of proportional plus integral control, calculate integration control or The target value of reactive component in the output electric current of the inverter of person's proportional plus integral control output；

15. a kind of inverter, which is characterized in that including an at least processor and an at least memory, at least one described storage For storing instruction, at least one described processor makes the inverter perform claim require 1 to 7 to device after executing described instruction Any one of described in control method.

16. a kind of computer readable storage medium, which is characterized in that instruction is stored in the computer readable storage medium, When run on a computer, so that computer executes the control method as described in any one of claims 1 to 7.