CN105990849A - Mode switching control method and device of photovoltaic grid-connected inverter - Google Patents
Mode switching control method and device of photovoltaic grid-connected inverter Download PDFInfo
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Abstract
A mode switching control method and device of a photovoltaic grid-connected inverter relates to the technical field of grid-connected inverters. According to the control method, a bus voltage PID control loop and an inversion current PID control loop are included. The bus voltage PID control loop and the inversion current PID control loop are outer and inner loops respectively, namely the output quantity of the bus voltage PID control loop determines the input given value of the inversion current PID control loop, and the output quantity of the inversion current PID control loop determines output requirements of the photovoltaic grid-connected inverter in different work modes. According to the control method, the input given value of the bus voltage PID control loop is changed to realize switching among the different work modes. The same double PID control loops are used in the different modes, only the input given value of the bus voltage PID control loop is different in the different modes, mode switching is smooth and stable and easy to control, and control failure is prevented.
Description
Technical field
The present invention relates to combining inverter technical field, particularly relate to the control method of the pattern switching of a kind of photovoltaic combining inverter and control device.
Background technology
Photovoltaic combining inverter can be divided into grid generation situation according to inverter when grid-connected work: preferential power generation mode (output of inverter full power), (bus energy storage preferentially and not allows inverter to feed to electrical network to counterflow-preventing energy storage mode of priority, allow electrical network output electric energy but do not allow to carry electric energy to electrical network), counterflow-preventing powers mode of priority (only by bus to load supplying, electrical network output electric energy is neither allowed the most or not to carry electric energy to electrical network), normal four kinds of patterns of energy storage pattern (bus energy storage is preferential), wherein, counterflow-preventing refers to prevent inverter from carrying electric energy to electrical network, how to realize having taken over seamlessly the key technology point into combining inverter between the normal work of these four pattern and pattern.
The control method of traditional pattern switching is that busbar voltage PID control ring independently controls with inverter current PID control ring, i.e. busbar voltage PID controls the voltage of ring control bus, ring is controlled unrelated with inverter current PID, and inverter current PID controls ring and only controls inverter outflow electric current, wherein:
(1) under preferential power generation mode, allow busbar voltage PID control ring inoperative, and the definite value that inputs to that inverter current PID controls ring is constant, is electric current during full power；
(2) under counterflow-preventing energy storage mode of priority, it is floating charging pressure point that busbar voltage PID controls the definite value that inputs to of ring, and the definite value that inputs to that inverter current PID controls ring is 0；
(3) under counterflow-preventing powers mode of priority, allow busbar voltage PID control ring inoperative, and the definite value that inputs to that inverter current PID controls ring is 0；
(4) under common energy storage pattern, it is floating charging pressure point that busbar voltage PID controls the definite value that inputs to of ring, i.e. normal rated voltage, and it is inoperative to allow inverter current PID control ring.
Above technology is to call different software modules respectively to the control of different mode, therefore, during switch mode, need re invocation software module and carry out interface data process, i.e. make the switching between pattern smooth not, easily cause control inefficacy, control more complicated simultaneously.
Summary of the invention
The control method that it is an object of the invention to avoid weak point of the prior art and provide the pattern of a kind of photovoltaic combining inverter to switch, the control method of the pattern switching of this photovoltaic combining inverter can make the switching between the pattern of photovoltaic combining inverter smooth, control fairly simple, working stability, does not results in control and lost efficacy.
The purpose of the present invention is achieved through the following technical solutions:
The control method that the pattern of a kind of photovoltaic combining inverter switches is provided, the control method of described photovoltaic combining inverter includes that busbar voltage PID controls ring and inverter current PID controls ring, inverter current PID controls the output of ring and determines photovoltaic combining inverter output demand under various mode of operations, it is characterized in that: busbar voltage PID is controlled ring as outer shroud by this control method, inverter current PID is controlled ring as internal ring, it is to be controlled the output decision of ring by busbar voltage PID that i.e. inverter current PID controls the definite value that inputs to of ring, inputing to definite value and can realizing the switching of different working modes of ring is controlled by changing busbar voltage PID.
Preferably, the output of busbar voltage PID control ring measures the definite value that inputs to controlling ring after bearing as inverter current PID, and inverter current PID controls the output of ring and jointly realizes photovoltaic combining inverter output demand under various mode of operations plus voltage feed-forward control amount.
Another is preferred, and described mode of operation includes:
Preferential power generation mode: the power of described preferential power generation mode i.e. inverter output is rated output power；
Counterflow-preventing energy storage mode of priority: the described i.e. bus energy storage of counterflow-preventing energy storage mode of priority preferentially and not allows inverter to feed to electrical network, i.e. allows electrical network output electric energy but does not allow to carry electric energy to electrical network；
Counterflow-preventing is powered mode of priority: described counterflow-preventing power mode of priority the most only by bus to load supplying, neither allow electrical network output electric energy the most not allow to carry electric energy to electrical network；
Normal energy storage pattern: described normal energy storage pattern is the most preferential to bus energy storage, it is allowed to electrical network charges to battery through inverter.
Another is preferred, if photovoltaic combining inverter need to work in preferential power generation mode, i.e. inverter and export with rated power, then the definite value that inputs to of busbar voltage PID control ring is: bus low-voltage protection point A.
Another is preferred, if photovoltaic combining inverter need to work in counterflow-preventing energy storage mode of priority, i.e. bus energy storage and preferentially and not allow inverter to feed to electrical network, it is allowed to electrical network output electric energy but do not allow to carry electric energy to electrical network, the most first judge the size of power network current:
If inverter has conveying electric energy to electrical network, i.e. inverter flows to the electric current of electrical network more than the maximum current B allowed, then the definite value that inputs to of busbar voltage PID control ring is updated to: current busbar voltage PID controls the definite value that inputs to of ring and adds secured adjusted amount C, so that the electric current that inverter flows to electrical network drops to the maximum current B that electrical network allows
If electrical network has output electric energy, the electric current that i.e. electrical network flows out is more than the maximum current E allowed, then the definite value that inputs to of busbar voltage PID control ring is updated to: floating charging pressure point D, so that when busbar voltage is less than floating charging pressure point, electrical network can export electric energy with supplementary bus electric energy insufficient section, and when busbar voltage is higher than floating charging pressure point, increase the output electric energy of inverter so that bus energy storage reduces.Finally make busbar voltage reach float charge voltage value, i.e. realize the preferential energy storage of bus.
Another is preferred, if photovoltaic combining inverter need to work in counterflow-preventing and power mode of priority, i.e. only by bus to load supplying, neither allows electrical network output electric energy the most not allow to carry electric energy to electrical network, the most first judges the size of power network current:
If inverter has conveying electric energy to electrical network, i.e. inverter flows to the electric current of electrical network more than the maximum current B allowed, then the definite value that inputs to of busbar voltage PID control ring is updated to: current busbar voltage PID controls the definite value that inputs to of ring and adds secured adjusted amount C, so that inverter flows to the electric current of electrical network less than the maximum current B allowed
If electrical network has output electric energy, the electric current that i.e. electrical network flows out is more than the maximum current B allowed, then the definite value that inputs to of busbar voltage PID control ring is updated to: busbar voltage PID controls the definite value that inputs to of ring and deducts secured adjusted amount C, so that the electric current that electrical network flows out is less than the maximum current B allowed.
Another is preferred, if photovoltaic combining inverter need to work in normal energy storage pattern, i.e. preferential to bus energy storage, it is allowed to electrical network charges to battery through inverter, then the definite value that inputs to of busbar voltage PID control ring is updated to: floating charging pressure point D.
Another is preferred, no matter which kind of mode of operation, all need the output that busbar voltage PID is controlled ring measure negative after carry out amplitude limit, when inverter output electric energy, busbar voltage PID controls the maximum output of ring is inverter output-current rating, when electrical network is to inverter conveying electric energy, busbar voltage PID controls the maximum output of ring is the maximum current that rated charge stream, i.e. electrical network flow to inverter.
Beneficial effects of the present invention: the control method of the photovoltaic combining inverter of the present invention includes that busbar voltage PID controls ring and inverter current PID controls ring.nullPrior art is to call different software modules respectively to the control of different mode，Between different mode, independent PID is controlled ring service condition different (i.e. different mode lower inner ring and outer shroud select a use or situation that both are used together has)，Therefore，During switch mode，Need re invocation software module and carry out interface data process，I.e. make the switching between pattern the most smooth、Easily cause control to lose efficacy，Control more complicated simultaneously，The present invention is because controlling ring as outer shroud using busbar voltage PID，Inverter current PID is controlled ring as internal ring，I.e. busbar voltage PID control ring output determine inverter current PID control ring input to definite value，Inverter current PID controls the output of ring and determines photovoltaic combining inverter output demand under various mode of operations，Inputing to definite value and can realizing the switching of different working modes of ring is controlled by changing busbar voltage PID，So the present invention is different mode all uses same software module，Same couple of PID is all used to control ring (i.e. different mode lower inner ring and outer shroud is used together) under different mode.Having only to change busbar voltage PID and control the switching that definite value is achieved that between different mode that inputs to of ring, therefore, the switching between pattern smooths, and controls fairly simple, working stability, does not results in control and lost efficacy.
Accompanying drawing explanation
Utilize accompanying drawing that invention is described further, but the embodiment in accompanying drawing does not constitute any limitation of the invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to the following drawings.
Fig. 1 is the flow chart of the control method of the pattern switching of a kind of photovoltaic combining inverter of the present invention.
Fig. 2 is the structural representation of combining inverter that the control method of the pattern switching of a kind of photovoltaic combining inverter of the present invention is controlled.
Detailed description of the invention
The invention will be further described with the following Examples.
The control method of the pattern switching of a kind of photovoltaic combining inverter of the present embodiment, as in figure 2 it is shown, the photovoltaic combining inverter of the set of cells for controlling to include that 30 joint 12V are in series, described photovoltaic combining inverter uses three-phase half-bridge topology.
In the present embodiment, the control method of described photovoltaic combining inverter includes that busbar voltage PID controls ring and inverter current PID controls ring, inverter current PID controls the output of ring and determines photovoltaic combining inverter output demand under various mode of operations, busbar voltage PID is controlled ring as outer shroud by this control method, inverter current PID is controlled ring as internal ring, i.e. busbar voltage PID controls the output of ring and determines that what inverter current PID controlled ring inputs to definite value, controls inputing to definite value and can realizing the switching of different working modes of ring by changing busbar voltage PID.
Concrete, the output of busbar voltage PID control ring measures the definite value that inputs to controlling ring after bearing as inverter current PID, and inverter current PID controls the output of ring and jointly realizes photovoltaic combining inverter output demand under various mode of operations plus voltage feed-forward control amount.
Described mode of operation includes:
Preferential power generation mode: the power of described preferential power generation mode i.e. inverter output is rated output power；
Counterflow-preventing energy storage mode of priority: the described i.e. bus energy storage of counterflow-preventing energy storage mode of priority preferentially and not allows inverter to feed to electrical network, i.e. allows electrical network output electric energy but does not allow to carry electric energy to electrical network；
Counterflow-preventing is powered mode of priority: described counterflow-preventing power mode of priority the most only by bus to load supplying, neither allow electrical network output electric energy the most not allow to carry electric energy to electrical network；
Normal energy storage pattern: described normal energy storage pattern is the most preferential to bus energy storage, it is allowed to electrical network charges to battery through inverter.
Concrete, if photovoltaic combining inverter need to work in preferential power generation mode, i.e. inverter and export with rated power, then the definite value that inputs to of busbar voltage PID control ring is: bus low-voltage protection point A.
Preferentially and not allow inverter to feed to electrical network if photovoltaic combining inverter need to work in counterflow-preventing energy storage mode of priority, i.e. bus energy storage, it is allowed to electrical network output electric energy but do not allow to carry electric energy to electrical network, the most first judge the size of power network current:
If inverter has conveying electric energy to electrical network, i.e. inverter flows to the electric current of electrical network more than the maximum current B allowed, then the definite value that inputs to of busbar voltage PID control ring is updated to: current busbar voltage PID controls the definite value that inputs to of ring and adds secured adjusted amount C, so that the electric current that inverter flows to electrical network drops to the maximum current B that electrical network allows
If electrical network has output electric energy, the electric current that i.e. electrical network flows out is more than the maximum current E allowed, then the definite value that inputs to of busbar voltage PID control ring is updated to: floating charging pressure point D, so that when busbar voltage is less than floating charging pressure point, electrical network can export electric energy with supplementary bus electric energy insufficient section, and when busbar voltage is higher than floating charging pressure point D, increases the output electric energy of inverter so that bus energy storage reduces, most make busbar voltage reach float charge voltage value, i.e. realize the preferential energy storage of bus.
If photovoltaic combining inverter need to work in counterflow-preventing and power mode of priority, i.e. only by bus to load supplying, neither allow electrical network output electric energy the most not allow to carry electric energy to electrical network, the most first judge the size of power network current:
If inverter has conveying electric energy to electrical network, i.e. inverter flows to the electric current of electrical network more than the maximum current B allowed, then the definite value that inputs to of busbar voltage PID control ring is updated to: current busbar voltage PID controls the definite value that inputs to of ring and adds secured adjusted amount C, so that inverter flows to the electric current of electrical network less than the maximum current B allowed
If electrical network has output electric energy, the electric current that i.e. electrical network flows out is more than the maximum current E allowed, then the definite value that inputs to of busbar voltage PID control ring is updated to: busbar voltage PID controls the definite value that inputs to of ring and deducts secured adjusted amount C, so that the electric current that electrical network flows out is less than the maximum current E allowed.
If photovoltaic combining inverter need to work in normal energy storage pattern, i.e. preferential to bus energy storage, it is allowed to electrical network charges to battery through inverter, then the definite value that inputs to of busbar voltage PID control ring is updated to: floating charging pressure point D.
No matter which kind of mode of operation, all need the output that busbar voltage PID is controlled ring measure negative after carry out amplitude limit, making busbar voltage PID when inverter output electric energy control the maximum output of ring is inverter output-current rating, when electrical network is to inverter conveying electric energy, busbar voltage PID controls the maximum output of ring is the maximum current that rated charge stream, i.e. electrical network flow to inverter.
The present embodiment is applied to high-power combining inverter product, and its structured flowchart is shown in accompanying drawing 2, and bus directly hung by battery, and steady state voltage during bus floating charge is 405V, and low-voltage protection point is 320V.
Its principle is as follows, as shown in Figure 1:
(1) preferential power generation mode
In such a mode, inverter full power conveying electric energy, i.e. inverter deduct bearing power to the generated energy of electrical network equal to rated power, therefore allow photovoltaic cell and the energy-storage battery rated power needed for inverter section is supplied, and busbar voltage at this moment is unstable.The definite value that inputs to making busbar voltage PID control ring is low-voltage protection point 320V, its objective is to allow electrical network can from inverter obtain electricity be so that busbar voltage reaches low-voltage protection point 320V to greatest extent till.
Its principle is: the definite value that inputs to making busbar voltage PID control ring is low-voltage protection point 320V; i.e. allow battery discharge; when output power inverter is not up to rated power; battery energy storage can be reduced; electric energy can be extracted from bus; so that the energy that photovoltaic cell and energy-storage battery carry to inverter increases, the output finally making inverter is rated power.I.e. when bus sampled voltage U is more than set-point 320V, the final purpose controlling ring according to PID is: controlled volume follows set-point, then after busbar voltage PID controls ring, busbar voltage will be made to reduce, i.e. battery discharge, controls to make after ring inverter current increase until maximum limit amplitude through inverter current PID.
nullImplement: because of current busbar voltage U necessarily more than low-voltage protection point A，I.e. bus has energy available，Then control ring through busbar voltage PID，Busbar voltage PID controls the output (i.e. regulated quantity) of ring and is reduced by，If regulation inverter flows to the electric current of electrical network for just，It is negative that electrical network flows into the electric current of inverter，Therefore the definite value that inputs to needing to make inverter current PID to control ring increases (final on the occasion of)，And it is described above，Busbar voltage PID controls the output of ring and reduces，But be actually needed electric current PID loop input to quantitatively increase，Therefore the output that busbar voltage PID controls ring is needed to take negative process，I.e. inverter current PID controls the definite value that inputs to of ring and adds up to 0 (similar no longer repetition) with the output of busbar voltage PID control ring，Ring is controlled the most again through inverter current PID，Make in the case of load is constant，Inverter output electricity increases，The electric current of the most final inverter output is output-current rating.
(2) counterflow-preventing energy storage mode of priority
In such a mode, it is allowed to the reverse rectification of inverter but do not allow inverter to feed to electrical network, i.e. allow electrical network to battery charging or to load supplying, but do not allow inverter to grid generation.Therefore allowing electrical network to flow to the maximum current of inverter is nominal cell charging current (the most do not allow the electric current to battery charging excessive), but the electric current not allowing inverter to flow to electrical network does not the most allow inverter to have current direction electrical network more than 0.5A(, but in inverter has the current direction electrical network of no more than 0.5A to be also acceptable scope).
When electrical network flows to the electric current of inverter more than 0.5A (B=0.5A), illustrate that the electric energy of now photovoltaic cell, less than the electric energy sum needed for load and energy storage battery charging, now allows electrical network conveying electric energy.Implement: the definite value that inputs to that busbar voltage PID controls ring is set to the floating charging i.e. D=405V of pressure point 405V(), i.e. inverter can obtain electricity from electrical network is that battery charging is until battery is in floating charge state.When bus sampled voltage U is less than 405V, then busbar voltage PID controls the output increase of ring, take negative rear output to reduce, i.e. inverter current PID controls the definite value that inputs to of ring and reduces, then the inverter output electric energy after inverter current PID controls ring reduces, bus energy storage increases, i.e. busbar voltage rises；When bus sampled voltage U is more than 405V, then busbar voltage PID controls the output reduction of ring, take negative rear output to increase, i.e. inverter current PID controls the definite value that inputs to of ring and increases, then the inverter output electric energy after inverter current PID controls ring increases, bus energy storage reduces, i.e. busbar voltage declines.Busbar voltage is the most finally made to reach floating charging pressure point 405V；
And when inverter flows to the electric current of electrical network more than 0.5A (i.e. E=0.5A), then needing to reduce the output of inverter, the bus conveying power of corresponding prime to reduce, bus energy storage to be increased.Implement: the definite value that inputs to that definite value is current busbar voltage PID control ring that inputs to controlling ring by arranging busbar voltage PID adds 5V(i.e. C=5V), so output of busbar voltage PID control ring will increase, take the definite value that inputs to of i.e. inverter current PID control ring after bearing to reduce, the output making inverter current PID control ring reduces, until the output of inverter is equal to bearing power, the electric current finally making inverter flow to electrical network is about 0.
(3) counterflow-preventing is powered mode of priority
In such a mode, the reverse rectification of inverter is neither allowed the most or not inverter to grid generation, need to control inverter flowing to the electric current of electrical network is that 0(can accept inverter and flows to the electric current of electrical network and be 0.5A to the maximum), electrical network flows to the electric current of inverter and also can accept electrical network for 0(and flow to the electric current of inverter and be 0.5A to the maximum simultaneously).The definite value that inputs to that definite value is current busbar voltage PID control ring that inputs to that can control ring by arranging busbar voltage PID increases or reduces 5V to realize this purpose:
When inverter flows to the electric current of electrical network more than 0.5A, then needing to reduce the output of inverter, the bus conveying power of corresponding prime to reduce, bus energy storage to be increased.The definite value that inputs to that definite value is current busbar voltage PID control ring that inputs to then controlling ring by arranging busbar voltage PID adds 5V(i.e. C=5V), the output making busbar voltage PID control ring increases, take the set-point making inverter current PID control ring after bearing to reduce, ring is controlled again through inverter current PID, inverter output power is made to reduce, until output is equal to bearing power, the electric current finally making inverter flow to electrical network is about 0；
When electrical network flows to the electric current of inverter more than 0.5A, the definite value that inputs to that definite value is current busbar voltage PID control ring that inputs to then controlling ring by arranging busbar voltage PID deducts 5V(i.e. C=5V), i.e. reduce busbar voltage PID and control the output of ring, take the set-point making inverter current PID control ring after bearing to increase, ring is controlled again through inverter current PID, making inverter output power increase, until output is equal to bearing power, the electric current finally making electrical network flow to inverter is about 0.
(4) normal energy storage pattern
In such a mode, busbar voltage need to be made constant.Therefore the definite value that inputs to that can arrange busbar voltage PID control ring is equal to floating charging pressure point 405V, and inverter may be to grid generation it is also possible that battery be charged by electrical network by inverter.
In Fig. 2, Vd-grid and Vq-grid is voltage feed-forward control amount.
To sum up, the control strategy of the present invention is: increase busbar voltage PID control ring inputs to definite value, output after making busbar voltage PID control ring increases, take the input quantity making inverter current PID control ring after bearing to reduce, so that inverter output power reduces, even if bus energy storage increases, busbar voltage is finally made to increase to set-point；Otherwise, reduce busbar voltage PID control ring inputs to definite value, output after making busbar voltage PID control ring reduces, take the definite value that inputs to making inverter current PID control ring after bearing to increase, so that inverter output power increases, even if bus energy storage reduces, busbar voltage is finally made to be decreased to given voltage.
nullPrior art is to call different software modules respectively to the control of different mode，During different mode, independent two PID are controlled rings service condition different (different mode lower inner ring and outer shroud select a use or situation about being used together has)，Therefore，During switch mode，Need re invocation software module and carry out interface data process，I.e. make the switching between pattern the most smooth、Easily cause control to lose efficacy，Control more complicated simultaneously，The present embodiment is because controlling ring as outer shroud using busbar voltage PID，Inverter current PID is controlled ring as internal ring，I.e. busbar voltage PID control ring output determine inverter current PID control ring input to definite value，Inputing to definite value and can realizing the switching of different working modes of ring is controlled by changing busbar voltage PID，So the present embodiment is different mode all uses same software module，Same couple of PID is i.e. used to control ring (i.e. different mode lower inner ring and outer shroud is used together).Having only to change busbar voltage PID and control the switching that definite value has achieved that between different mode that inputs to of ring, therefore, the switching between pattern smooths, and controls fairly simple, working stability, does not results in control and lost efficacy.
The present embodiment carries out selecting to set by counter plate, and panel control chip is set by serial communication this and is sent to control chip so that combining inverter can take over seamlessly at any time under four kinds of mode of operations, and steady operation is in various patterns.
Method given herein, all or part of step therein can be by setting up functional module construction, by computer program instructions control realization.
Finally should be noted that; above example is only in order to illustrate technical scheme; rather than limiting the scope of the invention; although having made to explain to the present invention with reference to preferred embodiment; it will be understood by those within the art that; technical scheme can be modified or equivalent, without deviating from the spirit and scope of technical solution of the present invention.
Claims (16)
1. the control method of the pattern switching of a photovoltaic combining inverter, the control method of described photovoltaic combining inverter includes that busbar voltage PID controls ring and inverter current PID controls ring, inverter current PID controls the output of ring and determines photovoltaic combining inverter output demand under various mode of operations, it is characterized in that: busbar voltage PID is controlled ring as outer shroud by this control method, inverter current PID is controlled ring as internal ring, i.e. busbar voltage PID control ring output determine inverter current PID control ring input to definite value, inputing to definite value and can realizing the switching of different working modes of ring is controlled by changing busbar voltage PID.
The control method of the pattern switching of a kind of photovoltaic combining inverter the most as claimed in claim 1, it is characterized in that: the output of busbar voltage PID control ring measures the definite value that inputs to controlling ring after bearing as inverter current PID, and inverter current PID controls the output of ring and jointly realizes photovoltaic combining inverter output demand under various mode of operations plus voltage feed-forward control amount.
The control method of the pattern switching of a kind of photovoltaic combining inverter the most as claimed in claim 1, it is characterised in that: described mode of operation includes:
Preferential power generation mode: the power of described preferential power generation mode i.e. inverter output is rated output power；
Counterflow-preventing energy storage mode of priority: the described i.e. bus energy storage of counterflow-preventing energy storage mode of priority preferentially and not allows inverter to feed to electrical network, i.e. allows electrical network output electric energy but does not allow to carry electric energy to electrical network；
Counterflow-preventing is powered mode of priority: described counterflow-preventing power mode of priority the most only by bus to load supplying, neither allow electrical network output electric energy the most not allow to carry electric energy to electrical network；
Normal energy storage pattern: described normal energy storage pattern is the most preferential to bus energy storage, it is allowed to electrical network charges to battery through inverter.
The control method of the pattern switching of a kind of photovoltaic combining inverter the most as claimed in claim 3; it is characterized in that: if photovoltaic combining inverter need to work in preferential power generation mode; i.e. inverter exports with rated power, then the definite value that inputs to of busbar voltage PID control ring is: bus low-voltage protection point A.
The control method of the pattern switching of a kind of photovoltaic combining inverter the most as claimed in claim 3, it is characterized in that: if photovoltaic combining inverter need to work in counterflow-preventing energy storage mode of priority, i.e. bus energy storage preferentially and not allows inverter to feed to electrical network, allow electrical network output electric energy but do not allow to carry electric energy to electrical network, the most first judge the size of power network current:
If inverter has conveying electric energy to electrical network, i.e. inverter flows to the electric current of electrical network more than the maximum current B allowed, then the definite value that inputs to of busbar voltage PID control ring is updated to: current busbar voltage PID controls the definite value that inputs to of ring and adds secured adjusted amount C, so that the electric current that inverter flows to electrical network drops to the maximum current B that electrical network allows
If the electric current that electrical network has output electric energy, i.e. electrical network to flow out is more than the maximum current E allowed, then the definite value that inputs to of busbar voltage PID control ring is updated to: floating charging pressure point D, so that busbar voltage reaches float charge voltage value, i.e. realizes the preferential energy storage of bus.
The control method of the pattern switching of a kind of photovoltaic combining inverter the most as claimed in claim 3, it is characterized in that: if photovoltaic combining inverter need to work in counterflow-preventing and power mode of priority, i.e. only by bus to load supplying, neither allow electrical network output electric energy the most not allow to carry electric energy, the most first judge the size of power network current:
If inverter has conveying electric energy to electrical network, i.e. inverter flows to the electric current of electrical network more than the maximum current B allowed, then the definite value that inputs to of busbar voltage PID control ring is updated to: current busbar voltage PID controls the definite value that inputs to of ring and adds secured adjusted amount C, so that inverter flows to the electric current of electrical network less than the maximum current B allowed
If electrical network has output electric energy, the electric current that i.e. electrical network flows out is more than the maximum current E allowed, then the definite value that inputs to of busbar voltage PID control ring is updated to: busbar voltage PID controls the definite value that inputs to of ring and deducts secured adjusted amount C, so that the electric current that electrical network flows out is less than the maximum current E allowed.
The control method of the pattern switching of a kind of photovoltaic combining inverter the most as claimed in claim 3, it is characterized in that: if photovoltaic combining inverter need to work in normal energy storage pattern, i.e. preferential to bus energy storage, allow electrical network to charge to battery through inverter, then the definite value that inputs to of busbar voltage PID control ring is updated to: floating charging pressure point D.
The control method of the pattern switching of a kind of photovoltaic combining inverter the most as claimed in claim 3, which kind of it is characterized in that: no matter mode of operation, all need the output that busbar voltage PID is controlled ring measure negative after carry out amplitude limit, making busbar voltage PID when inverter output electric energy control the maximum output of ring is inverter output-current rating, when electrical network is to inverter conveying electric energy, busbar voltage PID controls the maximum output of ring is the maximum current that rated charge stream, i.e. electrical network flow to inverter.
9. the control device of the pattern switching of a photovoltaic combining inverter, the control device of described photovoltaic combining inverter includes that busbar voltage PID controls device and inverter current PID controls device, busbar voltage PID control device output determine inverter current PID control device input to definite value, inverter current PID controls the output of device and determines photovoltaic combining inverter output demand under various mode of operations, this control device characteristic is: include inputing to definite value to realize the mode transition controller to the switching of different working modes by change that busbar voltage PID controls device.
The control device of the pattern switching of a kind of photovoltaic combining inverter the most as claimed in claim 9, it is characterized in that: also include processing means: for busbar voltage PID is controlled the output of device measure negative after control the definite value that inputs to of device as inverter current PID, inverter current PID controls the output of ring and jointly realizes photovoltaic combining inverter output demand under various mode of operations plus voltage feed-forward control amount.
The control device of the pattern switching of 11. a kind of photovoltaic combining inverters as claimed in claim 9, it is characterised in that: described mode of operation includes:
Preferential power generation mode: the power of described preferential power generation mode i.e. inverter output is rated output power；
Counterflow-preventing energy storage mode of priority: the described i.e. bus energy storage of counterflow-preventing energy storage mode of priority preferentially and not allows inverter to feed to electrical network, i.e. allows electrical network output electric energy but does not allow to carry electric energy to electrical network；
Counterflow-preventing is powered mode of priority: described counterflow-preventing power mode of priority the most only by bus to load supplying, neither allow electrical network output electric energy the most not allow to carry electric energy to electrical network；
Normal energy storage pattern: described normal energy storage pattern is the most preferential to bus energy storage, it is allowed to electrical network charges to battery through inverter.
The control device of the pattern switching of 12. a kind of photovoltaic combining inverters as claimed in claim 11; it is characterized in that: also include the first instruction calls device: if photovoltaic combining inverter need to work in preferential power generation mode; i.e. inverter full power is to grid generation, then the first instruction calls device arranges busbar voltage PID and controls the definite value that inputs to of device and is: low-voltage protection point A.
The control device of the pattern switching of 13. a kind of photovoltaic combining inverters as claimed in claim 11, it is characterized in that: also include the second instruction calls device: if photovoltaic combining inverter need to work in counterflow-preventing energy storage mode of priority, i.e. bus energy storage preferentially and not allows inverter to feed to electrical network, allow electrical network output electric energy but do not allow to carry electric energy to electrical network, then the second instruction calls device first judges the size of power network current:
If inverter has conveying electric energy to electrical network, i.e. inverter flows to the electric current of electrical network more than the maximum current B allowed, then the second instruction calls device arranges busbar voltage PID and controls the definite value that inputs to of device and is: what busbar voltage PID controlled device inputs to definite value plus secured adjusted amount C, so that inverter flows to the maximum current B that the electric current of electrical network drops to allow
If electrical network has output electric energy, i.e. electrical network flows to the electric current of inverter more than the maximum current E allowed, then second give calling device arrange busbar voltage PID control device the definite value that inputs to be: floating charging pressure point D so that busbar voltage reaches float charge voltage value, i.e. realize the preferential energy storage of bus.
The control device of the pattern switching of 14. a kind of photovoltaic combining inverters as claimed in claim 11, it is characterized in that: also include the 3rd instruction calls device: if photovoltaic combining inverter need to work in counterflow-preventing and power mode of priority, i.e. only by bus to load supplying, neither allow electrical network output electric energy the most not allow to carry electric energy, then the 3rd give calling device and first judge the size of power network current:
If inverter has conveying electric energy to electrical network, i.e. inverter flows to the electric current of electrical network more than the maximum current B allowed, then the 3rd instruction calls device arranges busbar voltage PID and controls the definite value that inputs to of device and is: what busbar voltage PID controlled device inputs to definite value plus secured adjusted amount C, so that inverter flows to the electric current of electrical network less than the maximum current B allowed
If electrical network has output electric energy, i.e. electrical network flows to the electric current of inverter more than the maximum current E allowed, then the 3rd instruction calls device arrange busbar voltage PID control device the definite value that inputs to be: busbar voltage PID control device the definite value that inputs to deduct secured adjusted amount C so that electrical network flow out electric current less than allow maximum current E.
The control device of the pattern switching of 15. a kind of photovoltaic combining inverters as claimed in claim 11, it is characterized in that: also include the 4th instruction calls device: if photovoltaic combining inverter need to work in energy storage pattern, i.e. preferential to bus energy storage, allow electrical network through inverter to battery charge, then the 4th instruction calls device arrange busbar voltage PID control device the definite value that inputs to be: floating charging pressure point D.
The control device of the pattern switching of 16. a kind of photovoltaic combining inverters as claimed in claim 11, which kind of it is characterized in that: no matter mode of operation, the output that busbar voltage PID controls device is all needed to carry out amplitude limit, making busbar voltage PID when inverter output electric energy control the maximum output of device is inverter output-current rating, when electrical network is to inverter conveying electric energy, busbar voltage PID controls the maximum output of device is the maximum current that rated charge stream, i.e. electrical network flow to inverter.
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