CN102904286B - Grid-connected inverter and control method thereof - Google Patents
Grid-connected inverter and control method thereof Download PDFInfo
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Abstract
The invention relates to a grid-connected inverter and a control method thereof. The grid-connected inverter comprises a master control unit as well as a DC-side power supply, a DC-side switch, a busbar capacitor assembly, an inverter unit, a filter unit and a circuit breaker which are connected in sequence; the filter unit at least comprises a filter capacitor and a switch element connected with the filter capacitor in series; when the detected DC voltage reaches startup voltage, the master control unit sends a PWM (Pulse Width Modulation) wave to start the inverter unit to power on the switch element, and when the output voltage of the filter unit reaches the power grid voltage, the master control unit controls the circuit breaker to be powered on; and the master control unit also controls the inverter unit to stop inversion and power off the switch element when the detected DC voltage is lower than the startup voltage. According to the invention, because the switch element is additionally arranged on a branch of the filter capacitor of the filter unit, the grid-connected inverter is freely controlled not to absorb reactive power from a power grid under the circuit breaker is not powered off, so that the breaking frequency of the circuit breaker is reduced, the system efficiency is improved and the complete machine cost is reduced.
Description
Technical field
The present invention relates to circuit engineering field, more particularly, relate to a kind of combining inverter and control method thereof.
Background technology
As shown in Figure 1, be the main circuit topological structure figure of existing combining inverter.Existing combining inverter mainly comprises DC side power supply 10, DC side switch 20, bus capacitor assembly 30, inversion unit 40, filter unit 50, contactor 60, circuit breaker 70 and main control unit (not shown).Wherein, DC side power supply 10 exports bus capacitor assembly 30 to by DC side switch 20, then is undertaken after ac converter by inversion unit 40, and unit 50 obtains a sinusoidal voltage after filtering, contactor 60 closures, and output process circuit breaker 70 is to electrical network 80.Wherein filter unit 50 is conventional LC filter circuit or LCL filter circuit.The operation principle of this combining inverter is: in the time that the contactor 60 of AC disconnects, if main control unit detects the direct voltage of DC side power supply 10 and meets compressor start up condition, such as direct voltage reaches start voltage, main control unit output PWM ripple control inversion unit 40 carries out ac converter, synchronize with electrical network 80 voltages of contactor 60 front ends by the sinusoidal voltage that regulates the control of PWM ripple to obtain after filter unit 40 filtering, after detecting that the voltage at contactor 60 two ends is consistent, the switch of the closed contactor 60 of main control unit, realization is generated electricity by way of merging two or more grid systems.When the direct voltage of DC side power supply 10 is reduced to after shutdown voltage, main control unit control inversion unit 40 stops inversion, causes sinusoidal voltage lower than line voltage, and main control unit control contactor 60 disconnects.Meanwhile, main control unit is not controlled circuit breaker 70, the function of 70 overloads of circuit breaker, short-circuit protection and maintenance isolation.Above-mentioned DC side power supply 10 can be photovoltaic cell, and corresponding combining inverter is photovoltaic combining inverter, and above-mentioned DC side power supply 10 can be also other accumulation energy type DC power supply such as plumbic acid, lithium electricity, and corresponding combining inverter is energy storage combining inverter.
But above-mentioned combining inverter adopts circuit breaker 70 and contactor 60 to realize the design of circuit on-off with control circuit output at major loop, makes the cost of switch higher, simultaneously owing to having two switches at major loop, node is more, and the loss of inverter also increases, Efficiency Decreasing.
Summary of the invention
The technical problem to be solved in the present invention is, realize circuit on-off for existing combining inverter by contactor and cause the large defect of the high loss of switch cost, a kind of combining inverter and control method thereof of filter capacitor tandem tap element being carried out break-make control in filter unit is provided.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of combining inverter, comprise main control unit and the DC side power supply, DC side switch, bus capacitor assembly, inversion unit, filter unit and the circuit breaker that connect successively; Described filter unit at least comprises filter capacitor; Described filter unit also comprises: the switch element of connecting with described filter capacitor;
Described main control unit is connected with described DC side power supply, inversion unit and switch element, in the time that the direct voltage detecting reaches start voltage, send PWM ripple and start inversion unit closed described switch element, and described main control unit is connected with described circuit breaker, in the time that reaching line voltage, the output voltage of described filter unit controls described breaker closing; Described main control unit also stops send PWM ripple control inversion unit lower than start when voltage at the direct voltage detecting and stops inversion and disconnect described switch element.
According in combining inverter of the present invention, described main control unit also, in the time the system failure being detected, is controlled described circuit breaker and described switch element and is disconnected.
According in combining inverter of the present invention, described inversion unit is three-phase half-bridge or full-bridge inverting structure.
According in combining inverter of the present invention, described filter capacitor and switch element are three, and described filter unit also comprises three inductance, wherein, the inductance of connecting on every phase circuit between the input of filter unit and output, is connected to each phase circuit by a switch element respectively after three described filter capacitors connect with star fashion again.
According in combining inverter of the present invention, described filter capacitor and switch element are three, and described filter unit also comprises three inductance, wherein, the inductance of connecting on every phase circuit between the input of filter unit and output, is connected to each phase circuit by a switch element respectively after three described filter capacitors connect with triangle manner again.
According in combining inverter of the present invention, described filter capacitor and switch element are three, described filter unit also comprises six inductance, wherein, two inductance of connecting on every phase circuit between the input of filter unit and output, and three described filter capacitors are connected on the node between two inductance of connecting on each phase circuit by a switch element respectively after connecting with star fashion again.
According in combining inverter of the present invention, described filter capacitor and switch element are three, described filter unit also comprises six inductance, wherein, two inductance of connecting on every phase circuit between the input of filter unit and output, and three described filter capacitors are connected on the node between the above two inductance of each phase circuit by a switch element respectively after connecting with triangle manner again.
According in combining inverter of the present invention, described inversion unit is single-phase full bridge or semi-bridge inversion structure; Described filter capacitor and switch element are one, and described filter unit also comprises an inductance, wherein, the first input end of described filter unit is connected to the first output of described filter unit by described inductance, the second input of described filter unit is connected with the second output, after described filter capacitor and switch element series connection, is connected across between described the first output and the second output.
According in combining inverter of the present invention, described switch element is the passive or active switch elements such as relay, contactor, silicon controlled rectifier, field effect transistor or insulated gate bipolar transistor.
According in combining inverter of the present invention, described combining inverter is photovoltaic combining inverter or energy storage combining inverter.
The present invention also provides a kind of control method of combining inverter as above, and described combining inverter comprises main control unit and the DC side power supply, DC side switch, bus capacitor assembly, inversion unit, filter unit and the circuit breaker that connect successively; The switch element that described filter unit at least comprises filter capacitor and connects with described filter capacitor; Described control method comprises the following steps:
Described main control unit sends PWM ripple and starts inversion unit closed described switch element in the time that the direct voltage that DC side power supply detected reaches start voltage;
Described main control unit is controlled described breaker closing in the time that the output voltage of described filter unit reaches line voltage;
Described main control unit stops send PWM ripple control inversion unit lower than start when voltage at the direct voltage detecting and stops inversion and disconnect described switch element.
Implement combining inverter of the present invention and control method thereof, there is following beneficial effect: the present invention increases switch element by the filter capacitor branch road at filter unit, cancel the switch element of major loop as contactor simultaneously, ensure that circuit breaker is not in the situation that disconnecting, freely control combining inverter start and stop generating, and from electrical network absorb idle, reduce so on the one hand the disjunction number of times of circuit breaker, ensure the life-span of circuit breaker, in the time that quitting work, inverter system do not affect on the other hand power grid quality yet, saved the switch element of major loop simultaneously, minimizing system heating loss, improve system effectiveness, reduce complete machine cost.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the main circuit topological structure figure of existing combining inverter;
Fig. 2 is the main circuit topological structure figure according to the preferred embodiment of combining inverter of the present invention;
Fig. 3 is according to the schematic diagram of inversion unit in the preferred embodiment of combining inverter of the present invention;
Fig. 4 is according to the schematic diagram of the first embodiment of filter unit in combining inverter of the present invention;
Fig. 5 is according to the schematic diagram of the second embodiment of filter unit in combining inverter of the present invention;
Fig. 6 is according to the schematic diagram of the 3rd embodiment of filter unit in combining inverter of the present invention;
Fig. 7 is according to the schematic diagram of the 4th embodiment of filter unit in combining inverter of the present invention;
Fig. 8 is according to the schematic diagram of the 5th embodiment of filter unit in combining inverter of the present invention;
Fig. 9 is according to the schematic diagram of the 6th embodiment of filter unit and inversion unit in combining inverter of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.
Refer to Fig. 2, for according to the main circuit topological structure figure of the preferred embodiment of combining inverter of the present invention.As shown in Figure 2, combining inverter provided by the invention comprises main control unit (not shown), and the DC side power supply 10, DC side switch 20, bus capacitor assembly 30, inversion unit 40, filter unit 50 and the circuit breaker 70 that connect successively.Wherein, DC side power supply 10 exports bus capacitor assembly 30 to by DC side switch 20, then is undertaken after ac converter by inversion unit 40, and unit 50 obtains a sinusoidal voltage after filtering, and circuit breaker 70 closures export electrical network 80 realizations to and generate electricity by way of merging two or more grid systems.
Combining inverter of the present invention does not adopt traditional contactor, but filter unit 50 is improved, and realizes the control to connecting and disconnecting of the circuit.This filter unit 50 is made up of LC filter circuit or LCL filter circuit conventionally, and therefore filter unit 50 at least has filter capacitor 51.Compared with prior art, one aspect of the present invention, by set up the switch element 52 of connecting with filter capacitor 51 in filter unit 50, realizes the control to circuit, by main control unit, circuit breaker 70 is controlled and is realized break-make control on the other hand.Wherein, switch element 52 is subject to master control unit controls, main control unit is also connected with DC side power supply 10, inversion unit 40 and circuit breaker 70, main control unit sends PWM ripple startup inversion unit 40 and carries out inversion in the time that the direct voltage of the DC side power supply 10 detecting reaches start voltage, and Closing Switch element 52, filter capacitor 51 is come into operation.Main control unit is the output voltage of detection filter unit 50 simultaneously, and in the time that it reaches line voltage, controlling circuit breaker 70 closed is electrical network 80 power transmissions.Main control unit also stops constantly sending PWM ripple control inversion unit 40 at the direct voltage detecting lower than start voltage and stops inversion cut-off switch element 52.
Below the operation principle of generating electricity by way of merging two or more grid systems of combining inverter of the present invention is specifically described.
1) in the time that the circuit breaker 70 of AC disconnects, if main control unit detects the direct voltage of DC side power supply 10 and meets compressor start up condition, while reaching start voltage such as direct voltage, start soft opening device, main control unit sends PWM ripple, to inversion unit 40, the direct current of bus capacitor assembly 30 is carried out to inversion.Main control unit is while transmitted signal control switch element 52 closures in the time that the direct voltage that DC side power supply 10 detected reaches start voltage, and filter capacitor 51 is come into operation.The direct voltage of DC side obtains a sinusoidal voltage after the LC of inversion unit 40 inversions and filter unit 50 or LCL filtering, main control unit is by regulating this sinusoidal voltage of PWM ripple control to synchronize with the line voltage of the electrical network 80 of circuit breaker front end, after detecting that the voltage at circuit breaker 70 two ends is consistent, be that the output voltage of filter unit 50 is while reaching line voltage, the switch of main control unit transmitted signal close circuit breaker 70, realization is generated electricity by way of merging two or more grid systems.
2) direct voltage that DC side power supply 10 detected when main control unit is during lower than start voltage, main control unit transmitted signal control inversion unit 40 stops inversion, now circuit breaker 70 remains closed, inversion unit 40 transmitted signal control switch elements 52 disconnect, filter capacitor 51 is disconnected from electrical network, avoid producing unnecessary idle.
3) when detecting the direct voltage of DC side power supply 10, main control unit is elevated to after start voltage, main control unit starts inversion unit 40 again, and control switch element 52 comes into operation filter capacitor 51, then control inversion unit 40 inversions and go out that the voltage of synchronizeing with line voltage generates electricity and power control.
4), after system breaks down, main control unit control circuit breaker 70 and switch element 52 disconnect, and make system protected.
In technique scheme, if combining inverter fault-free, it is the variation along with illumination, in the situation of the direct voltage of DC side power supply 10 lower than start voltage, circuit breaker 70 can disconnect, and only need disconnect the switch element on the branch road of filter capacitor 51 in filter unit 50 by main control unit, meets system and does not draw idle from electrical network 80, in the life-span that ensures so on the one hand circuit breaker 70, in the time not generating electricity work, do not affect on the other hand power grid quality yet.
With the example that is connected to of three-phase structure and phase structure, the present invention will be described below, but those skilled in the art should imagine and obtain, the present invention also can adopt other structures to realize.
Refer to Fig. 3, for according to the schematic diagram of inversion unit in the preferred embodiment of combining inverter of the present invention.As shown in Figure 3, inversion unit 40 provided by the invention can adopt three phase full bridge inverter structure to realize, and the direct current of bus capacitor assembly 30, from the inversion of this three phase full bridge inverter structure is inputted on the right side of Fig. 3, produces three-phase alternating current and exports from left side.It should be appreciated that, inversion unit of the present invention is not limited thereto kind of a structure, and can adopt this area basic technology personnel to know other inverter structure that also can be applied to combining inverter, such as three-phase semi-bridge inversion structure etc.
Referring to Fig. 4, is the schematic diagram of the first embodiment of filter unit in combining inverter according to the present invention.As shown in Figure 4, this filter unit 50 adopts LC filter circuit, at least comprises 3 inductance, i.e. inductance L 1, inductance L 2 and inductance L 3; And 3 filter capacitors, i.e. filter capacitor C1, filter capacitor C2 and filter capacitor C3.Therefore correspondingly, filter unit 50 has been set up 3 switch elements, to connect with each filter capacitor accordingly.The inductance of connecting on every phase circuit between the input of filter unit 50 and output.Three filter capacitors connect with star fashion, the first end that is each filter capacitor in filter capacitor C1, filter capacitor C2 and filter capacitor C3 links together, and the second end is connected on every phase circuit by switch element K1, switch element K2 and switch element K3 respectively.The three-phase alternating current that inversion unit 40 inversions go out after the input of right side, produces afterwards after filtering a three phase sine alternating current and exports from left side from Fig. 4.
Referring to Fig. 5, is the schematic diagram of the second embodiment of filter unit in combining inverter according to the present invention.As shown in Figure 4, this filter unit 50 also adopts LC filter circuit, at least comprises 3 inductance, i.e. inductance L 1, inductance L 2 and inductance L 3; And 3 filter capacitors, i.e. filter capacitor C1, filter capacitor C2 and filter capacitor C3.Correspondingly, filter unit 50 has been set up 3 switch elements, to connect with each filter capacitor accordingly.The inductance of connecting on every phase circuit between the input of filter unit 50 and output.The difference of the second embodiment and the first embodiment is, three filter capacitors connect with triangle manner, be the second end that the first end circulation of each filter capacitor in filter capacitor C1, filter capacitor C2 and filter capacitor C3 is connected to last filter capacitor, and the first end of each filter capacitor is connected on every phase circuit by switch element K1, switch element K2 and switch element K3 respectively.By said structure, the three-phase alternating current that inversion unit 40 inversions go out after the input of right side, produces afterwards after filtering a three phase sine alternating current and exports from left side from Fig. 4.
Referring to Fig. 6, is the schematic diagram of the 3rd embodiment of filter unit in combining inverter according to the present invention.As shown in Figure 6, this filter unit 50 adopts LCL filter circuit, at least comprises 6 inductance, i.e. inductance L 1, inductance L 2, inductance L 3, inductance L 4, inductance L 5 and inductance L 6; And 3 filter capacitors, i.e. filter capacitor C1, filter capacitor C2 and filter capacitor C3.Therefore correspondingly, filter unit 50 has been set up 3 switch elements, to connect with each filter capacitor accordingly.2 inductance of connecting on every phase circuit between the input of filter unit 50 and output.In this embodiment, three filter capacitors connect with star fashion, the first end that is each filter capacitor in filter capacitor C1, filter capacitor C2 and filter capacitor C3 links together, and the second end is connected to the node between 2 inductance of connecting on every phase circuit by switch element K1, switch element K2 and switch element K3 respectively.By said structure, the three-phase alternating current that inversion unit 40 inversions go out after the input of right side, produces afterwards after filtering a three phase sine alternating current and exports from left side from Fig. 4.
Referring to Fig. 7, is the schematic diagram of the 4th embodiment of filter unit in combining inverter according to the present invention.As shown in Figure 7, this filter unit 50 also adopts LCL filter circuit, at least comprises 6 inductance, i.e. inductance L 1, inductance L 2, inductance L 3, inductance L 4, inductance L 5 and inductance L 6; And 3 filter capacitors, i.e. filter capacitor C1, filter capacitor C2 and filter capacitor C3.Correspondingly, filter unit 50 has been set up 3 switch elements, to connect with each filter capacitor accordingly.2 inductance of connecting on every phase circuit between the input of filter unit 50 and output.The difference of the second embodiment and the first embodiment is, three filter capacitors connect with triangle manner, be the second end that the first end circulation of each filter capacitor in filter capacitor C1, filter capacitor C2 and filter capacitor C3 is connected to last filter capacitor, and the first end of each filter capacitor is connected to the node between 2 inductance of connecting on every phase circuit by switch element K1, switch element K2 and switch element K3 respectively.By said structure, the three-phase alternating current that inversion unit 40 inversions go out after the input of right side, produces afterwards after filtering a three phase sine alternating current and exports from left side from Fig. 4.
Referring to Fig. 8, is the schematic diagram of the 5th embodiment of filter unit in combining inverter according to the present invention.In Fig. 8, the single-phase full bridge inverter circuit of 4 the switching tube compositions in right side forms inversion unit 40,, this filter unit 50 adopts LC filter circuit, at least comprises 1 inductance and 1 filter capacitor, i.e. inductance L and filter capacitor C.Therefore correspondingly, this filter unit 50 has been set up 1 switch element K1, to connect with filter capacitor C accordingly.Inductance L is connected between the first input end and the first output of filter unit 50, the second input of filter unit 50 is connected with the second output, after filter capacitor C and switch element K1 series connection, is connected across between first output and the second output of filter unit 50.In the present embodiment, switch element K2 is circuit breaker, by main control unit, circuit breaker is carried out to break-make control.By said structure, just can be through the inversion of inversion unit 40 from the direct current of Fig. 8 right side input, generation single-phase alternating current, the more single-phase sinusoidal ac of the rear generation in unit 50 after filtering, export from left side.Although use LC filter circuit in the present embodiment, but this area basic technology personnel should be appreciated that this circuit and equally also can use LCL filter circuit, only two inductance need to be connected between the first input end and the first output of filter unit 50, and after filter capacitor C and switch element K1 series connection, be connected across between the second output of two nodes between inductance and filter unit 50.
Referring to Fig. 9, is the schematic diagram of the 6th embodiment of filter unit and inversion unit in combining inverter according to the present invention.In embodiment shown in Fig. 9, circuit diagram is similar to Fig. 8, and difference is only that Fig. 8 inversion unit 40 adopts by 2 switching tubes and 2 single-phase semi-bridge inversion circuit that electric capacity forms.Correspondingly, the constitution and principle of filter unit 50 is identical with the 5th embodiment.
In the present invention, described switch element can be the passive or active devices such as relay, contactor, silicon controlled rectifier (SCR), field effect transistor (MOS) or insulated gate bipolar transistor (IGBT).
In addition, the DC side power supply 10 described in the present invention can be photovoltaic cell, and the combining inverter of corresponding formation is photovoltaic combining inverter.This DC side power supply can also adopt other accumulation energy type DC power supply such as plumbic acid, lithium electricity to realize, and the combining inverter of corresponding formation is energy storage combining inverter.
The present invention also provides a kind of control method of above-mentioned combining inverter, and as above this combining inverter comprises main control unit and the DC side power supply 10, DC side switch 20, bus capacitor assembly 30, inversion unit 40, filter unit 50 and the circuit breaker 70 that connect successively.The switch element 52 that filter unit 50 at least comprises filter capacitor 51 and connects with this filter capacitor 51.Control method provided by the invention comprises the following steps:
First, main control unit sends PWM ripple and starts inversion unit 40 Closing Switch element 52 in the time that the direct voltage that DC side power supply 10 detected reaches start voltage, and filter capacitor 51 is come into operation.
Subsequently, main control unit is controlled circuit breaker 70 closures in the time that the output voltage of filter unit 50 reaches line voltage, is electrical network 80 power transmissions.
Finally, main control unit stops sending PWM ripple at the direct voltage that detects DC side power supply 10 during lower than start voltage, control inversion unit 40 and stop inversion cut-off switch element 52, thereby filter capacitor 51 from electrical network disconnection, avoid producing unnecessary idle.
Should be explanatorily, the principle that combining inverter provided by the invention and control method thereof adopt is identical with flow process, therefore elaborating in the control method that is also applicable to combining inverter of each embodiment to combining inverter, the specific implementation flow process of such as modules etc.
To sum up, the present invention increases switch element by the filter capacitor branch road at filter unit, cancel the switch element of major loop as contactor simultaneously, ensure that circuit breaker is not in the situation that disconnecting, freely control inverter system start and stop generating, and from electrical network absorb idle, reduce so on the one hand the disjunction number of times of circuit breaker, ensure the life-span of circuit breaker, in the time that inverter system quits work, do not affect on the other hand power grid quality yet, saved the switch element of major loop simultaneously, reduce system heating loss, improve system effectiveness, reduced complete machine cost.
The present invention is described according to specific embodiment, but it will be understood by those skilled in the art that in the time not departing from the scope of the invention, can carry out various variations and be equal to replacement.In addition,, for adapting to specific occasion or the material of the technology of the present invention, can carry out many amendments and not depart from its protection range the present invention.Therefore, the present invention is not limited to specific embodiment disclosed herein, and comprises all embodiment that drop into claim protection range.
Claims (11)
1. a combining inverter, comprises main control unit and the DC side power supply, DC side switch, bus capacitor assembly, inversion unit, filter unit and the circuit breaker that connect successively; Described filter unit at least comprises filter capacitor; It is characterized in that, described filter unit also comprises: the switch element of connecting with described filter capacitor;
Described main control unit is connected with described DC side power supply, inversion unit and switch element, in the time that the direct voltage detecting reaches start voltage, send PWM ripple and start inversion unit closed described switch element, and described main control unit is connected with described circuit breaker, in the time that reaching line voltage, the output voltage of described filter unit controls described breaker closing;
Described main control unit also stops send PWM ripple control inversion unit lower than start when voltage at the direct voltage detecting and stops inversion and disconnect described switch element, and now circuit breaker remains closed.
2. combining inverter according to claim 1, is characterized in that, described main control unit also, in the time the system failure being detected, is controlled described circuit breaker and described switch element and disconnected.
3. combining inverter according to claim 1 and 2, is characterized in that, described inversion unit is three-phase half-bridge or full-bridge inverting structure.
4. combining inverter according to claim 3, it is characterized in that, described filter capacitor and switch element are three, and described filter unit also comprises three inductance, wherein, the inductance of connecting on every phase circuit between the input of filter unit and output, is connected to each phase circuit by a switch element respectively after three described filter capacitors connect with star fashion again.
5. combining inverter according to claim 3, it is characterized in that, described filter capacitor and switch element are three, and described filter unit also comprises three inductance, wherein, the inductance of connecting on every phase circuit between the input of filter unit and output, is connected to each phase circuit by a switch element respectively after three described filter capacitors connect with triangle manner again.
6. combining inverter according to claim 3, it is characterized in that, described filter capacitor and switch element are three, described filter unit also comprises six inductance, wherein, two inductance of connecting on every phase circuit between the input of filter unit and output, and three described filter capacitors are connected on the node between two inductance of connecting on each phase circuit by a switch element respectively after connecting with star fashion again.
7. combining inverter according to claim 3, it is characterized in that, described filter capacitor and switch element are three, described filter unit also comprises six inductance, wherein, two inductance of connecting on every phase circuit between the input of filter unit and output, and three described filter capacitors are connected on the node between the above two inductance of each phase circuit by a switch element respectively after connecting with triangle manner again.
8. combining inverter according to claim 1 and 2, is characterized in that, described inversion unit is single-phase full bridge or semi-bridge inversion structure; Described filter capacitor and switch element are one, and described filter unit also comprises an inductance, wherein, the first input end of described filter unit is connected to the first output of described filter unit by described inductance, the second input of described filter unit is connected with the second output, after described filter capacitor and switch element series connection, is connected across between described the first output and the second output.
9. combining inverter according to claim 1, is characterized in that, described switch element is relay, contactor, silicon controlled rectifier, field effect transistor or insulated gate bipolar transistor.
10. combining inverter according to claim 1, is characterized in that, described combining inverter is photovoltaic combining inverter or energy storage combining inverter.
11. 1 kinds according to the control method of the combining inverter described in any one in claim 1-10, it is characterized in that, described combining inverter comprises main control unit and the DC side power supply, DC side switch, bus capacitor assembly, inversion unit, filter unit and the circuit breaker that connect successively; The switch element that described filter unit at least comprises filter capacitor and connects with described filter capacitor; Described control method comprises the following steps:
Described main control unit sends PWM ripple and starts inversion unit closed described switch element in the time that the direct voltage that DC side power supply detected reaches start voltage;
Described main control unit is controlled described breaker closing in the time that the output voltage of described filter unit reaches line voltage;
Described main control unit stops send PWM ripple control inversion unit lower than start when voltage at the direct voltage detecting and stops inversion and disconnect described switch element, and now circuit breaker remains closed.
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| CN103346688B (en) * | 2013-06-24 | 2015-04-15 | 合肥工业大学 | Controlling method of improving current quality of grid-connected inverter during low-load operation |
| CN104993684B (en) * | 2015-06-30 | 2018-04-27 | 中国电力工程顾问集团华东电力设计院有限公司 | Soft start photovoltaic DC-to-AC converter and photovoltaic generating system |
| CN107134917A (en) * | 2016-02-29 | 2017-09-05 | 中兴通讯股份有限公司 | A kind of inverter control method, device and electricity generation system |
| CN105823992B (en) * | 2016-03-28 | 2019-01-01 | 江苏方程电力科技有限公司 | A kind of inverter self-checking circuit and its startup self-detection method applied to micro-capacitance sensor |
| CN110417016B (en) * | 2018-04-28 | 2023-06-06 | 华为技术有限公司 | Inverter, power generation system and method for inhibiting harmonic distortion of alternating current system |
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| CN101621205A (en) * | 2009-08-13 | 2010-01-06 | 合肥阳光电源有限公司 | Grid-combination operation method of photovoltaic grid-combination inverter containing transformer at AC side |
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