CN108390584A - A kind of control method of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase - Google Patents

A kind of control method of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase Download PDF

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Publication number
CN108390584A
CN108390584A CN201810144928.5A CN201810144928A CN108390584A CN 108390584 A CN108390584 A CN 108390584A CN 201810144928 A CN201810144928 A CN 201810144928A CN 108390584 A CN108390584 A CN 108390584A
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China
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switch pipe
switching tube
signal
phase
clamp
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CN201810144928.5A
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CN108390584B (en
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马海啸
段新锋
张晓峰
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Nanjing Post and Telecommunication University
Nanjing University of Posts and Telecommunications
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Nanjing Post and Telecommunication University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/123—Suppression of common mode voltage or current
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The present invention relates to a kind of control methods of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase, the operation mode of the ten switch non-isolated photovoltaic DC-to-AC converters of Clamp three-phase is divided into six normal work mode and two afterflow mode by this method, tri- road sinusoidal modulation waves of Zai Jiang obtain preprocessed signal with triangular wave by comparing device respectively, handle preprocessed signal to obtain signal Vx、VyAnd Vt, then to signal Vx、Vy、VtCarry out the grid source control signal that processing finally obtains ten switching tubes.The method have the advantages that passing through the on or off of six bridge arm switching tubes, two clamp switch pipes and two dc switch pipes in the ten switch non-isolated photovoltaic DC-to-AC converters of Clamp three-phase of control, suppression common mode leakage current, solve the problems, such as that the non-isolated photovoltaic DC-to-AC converter common mode leakage current of three-phase is big, conversion efficiency is low, person when ensuring to use and equipment safety, the characteristics of giving full play to ten switch Clamp three-phases non-isolated photovoltaic DC-to-AC converter has preferable actual application value.

Description

A kind of control method of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase
Technical field
The present invention relates to a kind of control methods of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase, belong to power electronics DC-AC converter technique field.
Background technology
With being continuously increased for photovoltaic system capacity, the requirement to the cost, efficiency and reliability of inverter is also increasingly It is high.Photovoltaic combining inverter requirement is efficient, at low cost, can bear photovoltaic cell output voltage and fluctuate big harmful effect, And its exchange output will also meet higher power quality.
It can be classified as two kinds of isolated form and non-isolation type according to whether inverter carries isolating transformer.Isolated form light Volt inverter realizes the electrical isolation of power grid and solar panel, has ensured the person and equipment safety, but its volume is big, price Height, system changeover are less efficient.The structure of non-isolation type photovoltaic DC-to-AC converter is free of transformer, has efficient, small, weight Gently, many advantages such as at low cost.
Currently, the peak efficiency of non-isolated photovoltaic inverter system can reach 98% or more.But the removal of transformer So that there is electrical connection between inverter input and output, due to the buffer action of not no transformer, power grid is deposited with photovoltaic array It is directly being electrically connected, there are virtual parasitic capacitances between photovoltaic array and the earth, thus are formed by parasitic capacitance, filtering The common mode resonance circuit of element and electric network impedance composition.In this common mode resonance circuit, the common mode changed in parasitic capacitance is electric Pressure will produce corresponding common mode current, and due to the presence of solar panel direct-to-ground capacitance, inverter will produce common mode leakage current when working, Increase system electromagnetic interference influences the quality of grid current, the harm person and equipment safety.In order to ensure the person and equipment peace Entirely, leakage current must be suppressed in a certain range.
Invention content
It is an object of the invention to：In view of the defects existing in the prior art, propose one kind ten switch Clamp three-phase it is non-every Control method from photovoltaic DC-to-AC converter can effectively improve the transfer efficiency of non-isolation type photovoltaic DC-to-AC converter, improve inverter Common mode characteristic, suppression common mode leakage current.
In order to reach object above, the present invention provides a kind of controls of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase Method processed, the inverter in this method include first switch pipe, second switch pipe, third switching tube, the 4th switching tube, the 5th open Guan Guan, the 6th switching tube, upper dc switch pipe, lower dc switch pipe, upper clamp switch pipe and lower clamp switch pipe, this method packet Include following steps：
The first step, by ten switch the non-isolated photovoltaic DC-to-AC converters of Clamp three-phase operation mode be divided into six normal work mode and The gate source voltage waveform of first switch pipe is denoted as V by two afterflow modegs1, the gate source voltage waveform of second switch pipe is denoted as Vgs2, the gate source voltage waveform of third switching tube is denoted as Vgs3, the gate source voltage waveform of the 4th switching tube is denoted as Vgs4, the 5th switch The gate source voltage waveform of pipe is denoted as Vgs5, the gate source voltage waveform of the 6th switching tube is denoted as Vgs6, the grid source electricity of upper dc switch pipe Corrugating is denoted as Vgs7, the gate source voltage waveform of lower dc switch pipe is denoted as Vgs8, the gate source voltage waveform note of upper clamp switch pipe For Vgs9, the gate source voltage waveform of lower clamp switch pipe is denoted as Vgs10；
A phase sinusoidal modulation waves in inverter are denoted as by second stepV ra , B phase sinusoidal modulation waves are denoted asV rb , C phase sinusoidal modulation waves It is denoted asV rc , by three road sinusoidal modulation wavesV ra 、V rb 、V rc Respectively preprocessed signal is obtained by comparing device with carrier triangular wave VcV g1、V g2、V g3、V g4、V g5、V g6；
Third step, by preprocessed signalV g1、V g3WithV g5It does and obtains signal V with operationx, by preprocessed signalV g4、V g6WithV g2It does Signal V is obtained with operationy, by preprocessed signal Vg1、Vg3、Vg5Three road signals, tri- roads Zai Jiang letter are obtained after doing same or operation two-by-two It number does and to obtain signal V with operationt；
4th step, to signal VtIt is the grid source control signal V that logical not operation respectively obtains dc switch pipegs7And it is lower straight Flow the grid source control signal V of switching tubegs8；
5th step, by signal VxWith signal VtIt does and obtains the grid source control signal V of upper clamp switch pipe with operationgs9, by signal Vy With signal VtIt does and obtains the grid source control signal V of lower clamp switch pipe with operationgs10；
6th step, by signal VxRespectively with preprocessed signal Vg1、Vg3And Vg5Do or operation after obtain the grid of first switch pipe successively Source controls signal Vgs1, third switching tube grid source control signal Vgs3With the grid source control signal V of the 5th switching tubegs5, by signal VyRespectively with preprocessed signal Vg4、Vg6And Vg2Do or operation after obtain the grid source control signal V of the 4th switching tube successivelygs4, The grid source control signal V of six switching tubesgs6With the grid source control signal V of second switch pipegs2。
The ten switch non-isolated photovoltaic DC-to-AC converters of Clamp three-phase of the present invention are added on the basis of three-phase bridge type converter Enter three-phase clamp circuit, which includes the first DC capacitor Cdc1, the second DC capacitor Cdc2, third DC capacitor Cdc3, upper dc switch pipe S7, lower dc switch pipe S8, upper clamp switch pipe S9With lower clamp switch pipe S10.To ten switch clamps Six bridge arm switching tube S in the non-isolated photovoltaic DC-to-AC converter of type three-phase1、S2、S3、S4、S5And S6Using SPWM control modes；To remaining Four switching tube S7、S8、S9And S10Carry out logic control so that S when the inverter works normally7And S8Conducting, and in inverter S when afterflow7And S8Shutdown, respectively to two clamp switch pipe S9And S10Carry out conducting control so that freewheeling period inverter common mode Voltage is effectively clamped the common mode characteristic that photovoltaic DC-to-AC converter is effectively improved to the 2/3 of DC input voitage and 1/3, to press down The common mode leakage current of photovoltaic DC-to-AC converter is made.
Preferably, the first switch pipe, second switch pipe, third switching tube, the 4th switching tube, the 5th switching tube, Six switching tubes are bridge arm switching tube, above-mentioned six bridge arm switching tubes S1、S2、S3、S4、S5、S6It is connected by SPWM control modes And shutdown.
Preferably, in the first step, when inverter is in normal work mode, if upper dc switch pipe and lower dc switch Manage in the conduction state, then upper clamp switch pipe and lower clamp switch pipe are in off state.
Preferably, when inverter is in normal work mode, the grid source control waveform V of first switch pipegs1It is opened with the 4th Close the grid source control waveform V of pipegs4On the contrary, the grid source control waveform V of third switching tubegs3Wave is controlled with the grid source of the 6th switching tube Shape Vgs6On the contrary, the grid source control waveform V of the 5th switching tubegs5With the grid source control waveform V of second switch pipegs2On the contrary.
Preferably, the grid source control waveform Vgs1、Vgs3、Vgs5For 120 ° of SPWM waveforms of phase mutual deviation.
Preferably, in the first step, when inverter is in afterflow mode, if first switch pipe, third switching tube, the 5th opening It closes pipe to simultaneously turn on, then upper dc switch pipe and the shutdown of lower dc switch pipe, while upper clamp switch pipe is connected；If the 4th switch Pipe, the 6th switching tube, second switch pipe simultaneously turn on, then upper dc switch pipe and the shutdown of lower dc switch pipe, same to clamp at present Switching tube is connected.
Preferably, in the first step, in the inverter course of work, the common mode electricity of inverter can be calculated according to the following formula Pressure：
Vcm=(VAQ+VBQ+VCQ)/3
Wherein, VcmFor the common-mode voltage of inverter, VAQFor A phase point current potentials, VBQFor B phase point current potentials, VCQFor C phase point current potentials.
Preferably, in second step, A phase sinusoidal modulation waves VraWith carrier triangular wave VcHand over the pre- place for cutting and generating first switch pipe Manage signal Vg1, by preprocessed signal Vg1Logic NOT is taken to generate the preprocessed signal V of the 4th switching tubeg4；B phase sinusoidal modulation waves Vrb With carrier triangular wave VcHand over the preprocessed signal V for cutting and generating third switching tubeg3, by preprocessed signal Vg3Logic NOT is taken to generate the 6th The preprocessed signal V of switching tubeg6；C phases sinusoidal modulation wave and carrier triangular wave VcIt hands over and cuts the pretreatment letter for generating the 5th switching tube Number Vg5, by preprocessed signal Vg5Logic NOT is taken to generate the preprocessed signal V of second switch pipeg2。
Preferably, in the first step, in the inverter course of work, it is assumed that the on off state of single switching transistor is Sx, and x= 1,3,5,7,8,9,10, then the S when single switching transistor is in the conduction statex=1, when single switching transistor is off state Sx=0；
The first switch pipe, third switching tube, the 5th switching tube are upper bridge arm switching tube, and opening for bridge arm switching tube is gone up by three Off status is denoted as [S1,S3,S5]( S7,S8,S9, S10).In addition, switching tube S4、S6、S2For lower bridge arm switching tube.
Preferably, when inverter is in normal work mode, the on off state of three upper bridge arm switching tubes is [1,0,0] (1,1,0,0)、[1,1,0] (1,1,0,0)、[0,1,0] (1,1,0,0)、[0,1,1] (1,1,0,0)、[0,0,1] (1,1, And [1,0,1] (1,1,0,0) 0,0)；When inverter is in afterflow mode, the on off state of three upper bridge arm switching tubes is [1,1,1] (0,0,1,0) and [0,0,0] (0,0,0,1).
In the ten switch non-isolated photovoltaic DC-to-AC converters of Clamp three-phase of the present invention, positive, the upper direct current of the first DC capacitor The drain electrode of switching tube is connected with the anode of solar cell respectively, the cathode of third DC capacitor, lower dc switch pipe source electrode Be connected respectively with the cathode of solar cell, the source electrode of upper clamp switch pipe respectively with the cathode of the first DC capacitor, second straight Galvanic electricity hold anode be connected, lower clamp switch pipe drain electrode respectively with the cathode of the second DC capacitor, third DC capacitor just Extremely it is connected；The source electrode of upper dc switch pipe respectively with the drain electrode of upper clamp switch pipe and first switch pipe, third switching tube, The drain electrodes of five switching tubes is connected, the drain electrode of lower dc switch pipe respectively with the source electrode of lower clamp switch pipe and the 4th switching tube, 6th switching tube, the source electrode of second switch pipe are connected.The source electrode of first switch pipe is connected with the drain electrode of the 4th switching tube, and third is opened The source electrode for closing pipe is connected with the drain electrode of the 6th switching tube, and the source electrode of the 5th switching tube is connected with the drain electrode of second switch pipe； There is tie point A, one end phase of tie point A and A phase filter inductances between the source electrode of one switching tube and the drain electrode of the 4th switching tube Even, the other end of A phase filter inductances is connected with one end of A phases filter capacitor, A phase resistances respectively；In the source electrode of third switching tube Between drain electrode with the 6th switching tube there is tie point B, tie point B to be connected with one end of B phase filter inductances, B phase filter inductances The other end be connected respectively with one end of B phases filter capacitor, B phase resistances；In the source electrode and second switch pipe of the 5th switching tube There is tie point C between drain electrode, tie point C is connected with one end of C phase filter inductances, the other ends of C phase filter inductances respectively with C Phase filter capacitor, one end of C phase resistances are connected；A phase resistances, B phase resistances, C phase resistances the other end by points of common connection N with A phases filter capacitor, B phases filter capacitor, the other end of C phase filter capacitors are connected.
It is an advantage of the invention that passing through six bridge arm switches in the ten switch non-isolated photovoltaic DC-to-AC converter of Clamp three-phase of control It is non-isolated to solve three-phase for the on or off of pipe, two clamp switch pipes and two dc switch pipes, suppression common mode leakage current The problem that photovoltaic DC-to-AC converter common mode leakage current is big, conversion efficiency is low, it is ensured that person when use and equipment safety give full play to The characteristics of ten switch Clamp three-phases non-isolated photovoltaic DC-to-AC converters, there is preferable actual application value.
Description of the drawings
The present invention will be further described below with reference to the drawings.
Fig. 1 is the schematic diagram of inverter topology in the present invention.
Fig. 2 is the schematic diagram of inverter control signal production method in the present invention.
Fig. 3 is the drive signal sequence diagram of inverter in the present invention.
Fig. 4 is the schematic diagram of inverter mode one in the present invention.
The schematic diagram of inverter mode two in Fig. 5 present invention.
Fig. 6 is the schematic diagram of inverter mode three in the present invention.
Fig. 7 is the schematic diagram of inverter mode four in the present invention.
Fig. 8 is the schematic diagram of inverter mode five in the present invention.
Fig. 9 is the schematic diagram of inverter mode six in the present invention.
Figure 10 is the schematic diagram of inverter mode seven in the present invention.
Figure 11 is the schematic diagram of inverter mode eight in the present invention.
Specific implementation mode
Embodiment one
It present embodiments provides one kind ten and switchs the non-isolated photovoltaic DC-to-AC converter topological structure of Clamp three-phase, structure such as Fig. 1 institutes Show, including six switching tube of three-phase, three-phase output filter, threephase load and three-phase clamp circuit, three-phase clamp circuit includes the One input direct-current capacitance Cdc1, the second input direct-current capacitance Cdc2, third input direct-current capacitance Cdc3, upper dc switch pipe S7, it is lower straight Flow switching tube S8, upper clamp switch pipe S9With lower clamp switch pipe S10.Solar cell UpvAnode respectively with the first direct current Hold Cdc1Positive, upper dc switch pipe S7Drain electrode be connected, upper dc switch pipe S7Source electrode respectively with upper clamp switch pipe S9 Drain electrode and first switch pipe S1, third switching tube S3, the 5th switching tube S5Drain electrode be connected；Solar cell UpvCathode Respectively with third DC capacitor Cdc3Cathode, lower dc switch pipe S8Source electrode be connected, lower dc switch pipe S8Drain electrode difference With lower clamp switch pipe S10Source electrode and the 4th switching tube S4, the 6th switching tube S6, second switch pipe S2Source electrode be connected；The One switching tube S1Source electrode and the 4th switching tube S4Drain electrode be connected；Third switching tube S3Source electrode and the 6th switching tube S6Leakage Extremely it is connected；5th switching tube S5Source electrode and second switch pipe S2Drain electrode be connected；Upper clamp switch pipe S9Source electrode respectively with One DC capacitor Cdc1Cathode, the second DC capacitor Cdc2Anode be connected；Lower clamp switch pipe S10Drain electrode respectively with second DC capacitor Cdc2Cathode, third DC capacitor Cdc3Anode be connected；In first switch pipe S1Source electrode and the 4th switching tube S4 Drain electrode between have tie point A, tie point A and A phase filter inductances LfaOne end be connected, A phase filter inductances LfaThe other end Respectively with A phase filter capacitors Cfa, A phase resistances RaOne end be connected；In third switching tube S3Source electrode and the 6th switching tube S6Leakage There is tie point B, tie point B and B phase filter inductances L between polefbOne end be connected, B phase filter inductances LfbThe other end difference With B phase filter capacitors Cfb, B phase resistances RbOne end be connected；In the 5th switching tube S5Source electrode and second switch pipe S2Drain electrode it Between have tie point C, tie point C and C phase filter inductances LfcOne end be connected, C phase filter inductances LfcThe other end respectively with C Phase filter capacitor Cfc, C phase resistances RcOne end be connected；A phase resistances Ra, B phase resistances Rb, C phase resistances RcThe other end pass through public affairs Tie point N and A phase filter capacitors C altogetherfa, B phase filter capacitors Cfb, C phase filter capacitors CfcThe other end be connected.In addition, first opens Close pipe S1, second switch pipe S2, third switching tube S3, the 4th switching tube S4, the 5th switching tube S5, the 6th switching tube S6It is opened for bridge arm Guan Guan, above-mentioned six bridge arm switching tubes S1、S2、S3、S4、S5、S6Turn-on and turn-off are carried out by SPWM control modes.Switching tube S1、 S3、S5For upper bridge arm switching tube, switching tube S4、S6、S2For lower bridge arm switching tube.
The present embodiment additionally provides a kind of control method of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase, such as Fig. 2 Shown in Fig. 3, this approach includes the following steps：
The first step switchs the non-isolated photovoltaic DC-to-AC converters of Clamp three-phase according to the on off state of three upper bridge arm switching tubes by ten Operation mode is divided into six normal work mode and two afterflow mode.When inverter is in normal work mode, if upper straight Flow switching tube S7With lower dc switch pipe S8It is in the conduction state, then go up clamp switch pipe S9With lower clamp switch pipe S10It is in Off state, first switch pipe S1Grid source control waveform Vgs1With the 4th switching tube S4Grid source control waveform Vgs4On the contrary, third Switching tube S3Grid source control waveform Vgs3With the 6th switching tube S6Grid source control waveform Vgs6On the contrary, the 5th switching tube S5Grid Source controls waveform Vgs5With second switch pipe S2Grid source control waveform Vgs2On the contrary, and grid source control waveform Vgs1、Vgs3、Vgs5 For 120 ° of SPWM waveforms of phase mutual deviation；When inverter is in afterflow mode, if first switch pipe S1, third switching tube S3, Five switching tube S5It simultaneously turns on, then upper dc switch pipe S7With lower dc switch pipe S8Shutdown, while upper clamp switch pipe S9It leads It is logical；If the 4th switching tube S4, the 6th switching tube S6, second switch pipe S2It simultaneously turns on, then upper dc switch pipe S7It is opened with lower direct current Close pipe S8Shutdown, with clamp switch pipe S at present10Conducting.
A phase sinusoidal modulation waves in inverter are denoted as by second stepV ra , B phase sinusoidal modulation waves are denoted asV rb , C phases are sinusoidal to be adjusted Wave processed is denoted asV rc , by three road sinusoidal modulation wavesV ra 、V rb 、V rc Respectively pretreatment letter is obtained by comparing device with carrier triangular wave Vc NumberV g1、V g2、V g3、V g4、V g5、V g6.Specifically, A phases sinusoidal modulation wave VraWith carrier triangular wave VcIt hands over to cut and generates first switch pipe S1Preprocessed signal Vg1, by preprocessed signal Vg1Logic NOT is taken to generate the 4th switching tube S4Preprocessed signal Vg4；B phases are sinusoidal Modulating wave VrbWith carrier triangular wave VcIt hands over to cut and generates third switching tube S3Preprocessed signal Vg3, by preprocessed signal Vg3Take logic The 6th switching tube S of non-generation6Preprocessed signal Vg6；C phases sinusoidal modulation wave and carrier triangular wave VcIt hands over to cut and generates the 5th switch Pipe S5Preprocessed signal Vg5, by preprocessed signal Vg5Logic NOT is taken to generate second switch pipe S2Preprocessed signal Vg2。
Third step, by preprocessed signalV g1、V g3WithV g5It does and obtains signal V with operationx, by preprocessed signalV g4、V g6WithV g2It does and obtains signal V with operationy, by preprocessed signal Vg1、Vg3、Vg5Do two-by-two with or operation after obtain three road signals, then by three Road signal is done obtains signal V with operationt。
4th step, to signal VtIt does logical not operation and respectively obtains dc switch pipe S7Grid source control signal Vgs7And Lower dc switch pipe S8Grid source control signal Vgs8。
5th step, by signal VxWith signal VtIt does and obtains upper clamp switch pipe S with operation9Grid source control signal Vgs9, will Signal VyWith signal VtIt does and obtains lower clamp switch pipe S with operation10Grid source control signal Vgs10。
6th step, by signal VxRespectively with preprocessed signal Vg1、Vg3And Vg5Do or operation after obtain first switch pipe successively S1Grid source control signal Vgs1, third switching tube S3Grid source control signal Vgs3With the 5th switching tube S5Grid source control signal Vgs5, by signal VyRespectively with preprocessed signal Vg4、Vg6And Vg2Do or operation after obtain the 4th switching tube S successively4Grid source control Signal Vgs4, the 6th switching tube S6Grid source control signal Vgs6With second switch pipe S2Grid source control signal Vgs2。
Waveform is respectively from top to bottom in Fig. 3：First switch pipe S1Gate source voltage waveform Vgs1；4th switching tube S4Grid Source voltage waveform Vgs4；Third switching tube S3Gate source voltage waveform Vgs3；6th switching tube S6Gate source voltage waveform Vgs6；5th Switching tube S5Gate source voltage waveform Vgs5；Second switch pipe S2Gate source voltage waveform Vgs2；Upper dc switch pipe S7Grid source electricity Corrugating Vgs7；Lower dc switch pipe S8Gate source voltage waveform Vgs8；Upper clamp switch pipe S9Gate source voltage waveform Vgs9；Lower pincers Bit switch pipe S10Gate source voltage waveform Vgs10。
In addition, in the inverter course of work, it is assumed that the on off state of single switching transistor is Sx, and x=1,3,5,7,8, 9,10, then the S when single switching transistor is in the conduction statex=1, the S when single switching transistor is off statex=0；First Switching tube S1, third switching tube S3, the 5th switching tube S5For upper bridge arm switching tube, the on off state for going up bridge arm switching tube by three It is denoted as [S1,S3,S5]( S7,S8,S9, S10), when inverter is in normal work mode, the switch of three upper bridge arm switching tubes State be [1,0,0] (1,1,0,0), [1,1,0] (1,1,0,0), [0,1,0] (1,1,0,0), [0,1,1] (1,1,0, 0), [0,0,1] (1,1,0,0) and [1,0,1] (1,1,0,0)；When inverter is in afterflow mode, three upper bridge arm switches The on off state of pipe is [1,1,1] (0,0,1,0) and [0,0,0] (0,0,0,1).
When non-isolated photovoltaic DC-to-AC converter be in mode for the moment, its working principle is that：
As shown in figure 4, the on off state of three upper bridge arm switching tubes is [1,0,0] (1,1,0,0), switching tube S1、S6、S2And S7、S8Gate source voltage be high level, and switching tube S1、S6、S2And S7、S8It is in the conduction state；Switching tube S3、S4、S5With And S9、S10Gate source voltage be zero, and switching tube S3、S4、S5And S9、S10It is off state.Electric current is from solar cell UpvAnode outflow, flow through S7→S1→Lfa→ A phase loads → points of common connection N（Midpoint）→ B phase loads, C phase loads → Lfb、 Lfc→S2、S6, most afterwards through S8Flow back to solar cell UpvCathode.At this point, VAQ=VPV, and VBQ=VCQ=0, therefore common-mode voltage Vcm =(VAQ+VBQ+VCQ)/3=1/3VPV.Wherein, VAQFor A phase point current potentials, VBQFor B phase point current potentials, VCQFor C phase point current potentials, VPVFor Solar cell UpvEquivalent DC voltage.
When non-isolated photovoltaic DC-to-AC converter is in mode two, its working principle is that：
As shown in figure 5, the on off state of three upper bridge arm switching tubes is [1,1,0] (1,1,0,0), switching tube S1、S3、S2And S7、S8Gate source voltage be high level, and switching tube S1、S3、S2And S7、S8It is in the conduction state；Switching tube S4、S5、S6With And S9、S10Gate source voltage be zero, and switching tube S4、S5、S6And S9、S10It is off state.Electric current is from solar cell UpvAnode outflow, flow through S7→S1、S3→Lfa、Lfb→ A phase loads, B phase loads → points of common connection N（Midpoint）→ C phases are born Load → Lfc→S2, most afterwards through S8Flow back to solar cell UpvCathode.At this point, VAQ=VBQ=VPV, and VCQ=0, therefore common-mode voltage Vcm=(VAQ+VBQ+VCQ)/3=2/3VPV。
When non-isolated photovoltaic DC-to-AC converter is in mode three, its working principle is that：
As shown in fig. 6, the on off state of three upper bridge arm switching tubes is [0,1,0] (1,1,0,0), switching tube S4、S3、S2And S7、S8Gate source voltage be high level, and switching tube S4、S3、S2And S7、S8It is in the conduction state；Switching tube S1、S5、S6With And S9、S10Gate source voltage be zero, and switching tube S1、S5、S6And S9、S10It is off state.Electric current is from solar cell UpvAnode outflow, flow through S7→S3→Lfb→ B phase loads → points of common connection N（Midpoint）→ A phase loads, C phase loads → Lfa、 Lfc→S4、S2, most afterwards through S8Flow back to solar cell UpvCathode.At this point, VBQ=VPV, and VAQ=VCQ=0, therefore common-mode voltage Vcm=(VAQ+VBQ+VCQ)/3=1/3VPV。
When non-isolated photovoltaic DC-to-AC converter is in mode four, its working principle is that：
As shown in fig. 7, the on off state of three upper bridge arm switching tubes is [0,1,1] (1,1,0,0), switching tube S4、S3、S5And S7、S8Gate source voltage be high level, and switching tube S4、S3、S5And S7、S8It is in the conduction state；Switching tube S1、S2、S6With And S9、S10Gate source voltage be zero, and switching tube S1、S2、S6And S9、S10It is off state.Electric current is from solar cell UpvAnode outflow, flow through S7→S3、S5→Lfb、Lfc→ B phase loads, C phase loads → points of common connection N（Midpoint）→ A phases are born Load → Lfa→S4, most afterwards through S8Flow back to solar cell UpvCathode.At this point, VBQ=VCQ =VPV, and VAQ=0, therefore common mode is electric Press Vcm=(VAQ+VBQ+VCQ)/3=2/3VPV。
When non-isolated photovoltaic DC-to-AC converter is in mode five, its working principle is that：
As shown in figure 8, the on off state of three upper bridge arm switching tubes is [0,0,1] (1,1,0,0), switching tube S4、S6、S5And S7、S8Gate source voltage be high level, and switching tube S4、S6、S5And S7、S8It is in the conduction state；Switching tube S1、S2、S3With And S9、S10Gate source voltage be zero, and switching tube S1、S2、S3And S9、S10It is off state.Electric current is from solar cell UpvAnode outflow, flow through S7→S5→Lfc→ C phase loads → points of common connection N（Midpoint）→ A phase loads, B phase loads → Lfa、 Lfb→S4、S6, most afterwards through S8Flow back to solar cell UpvCathode.At this point, VAQ =VBQ=0, and VCQ =VPV, therefore common-mode voltage Vcm=(VAQ+VBQ+VCQ)/3=1/3VPV。
When non-isolated photovoltaic DC-to-AC converter is in mode six, its working principle is that：
As shown in figure 9, the on off state of three upper bridge arm switching tubes is [1,0,1] (1,1,0,0), switching tube S1、S6、S5And S7、S8Gate source voltage be high level, and switching tube S1、S6、S5And S7、S8It is in the conduction state；Switching tube S2、S3、S4With And S9、S10Gate source voltage be zero, and switching tube S2、S3、S4And S9、S10It is off state.Electric current is from solar cell UpvAnode outflow, flow through S7→S1、S5→Lfa、Lfc→ A phase loads, C phase loads → points of common connection N（Midpoint）→ B phases are born Load → Lfb→S6, most afterwards through S8Flow back to solar cell UpvCathode.At this point, VAQ = VCQ =VPV, and VBQ=0, therefore common mode is electric Press Vcm=(VAQ+VBQ+VCQ)/3=2/3VPV。
When non-isolated photovoltaic DC-to-AC converter is in mode seven, its working principle is that：
As shown in Figure 10, the on off state of three upper bridge arm switching tubes is [1,1,1] (0,0,1,0).Once switching tube S1、S3、 S5Gate source voltage simultaneously be high level, switching tube S1、S3、S5It is in the conduction state, then switching tube S7、S8Shutdown, switching tube S9Conducting, circuit enter freewheeling period.Conducting there are two in three switching tubes of the usually upper bridge arm of the previous state of the mode, By taking mode two enters mode seven as an example, the on off state in [1,1,0] (1,1,0,0) → [1,1,1] (0,0,1,0), such as Figure 10 Shown, other situations are similar.At this point, due to switching tube S7And S8Shutdown, electric current can not be flowed along the path of normal operating conditions Dynamic, the electric current in afterflow inductance will form continuous current circuit along the switching tube that is respectively conducted, and due to DC side clamp switch pipe S9 Presence, each phase point current potential will be clamped to 2/3 VPV；By taking A phases as an example, inductance LfaIn electric current will be along Lfa→Ra→N→Rc →Lfc→ C phase loads → S5→S1→ A phase loads → LfaSequence access afterflow.Similarly, other two-phases are also continuous along similar channels Stream.The point current potential of each phase is 2/3V at this timePV.That is VAQ=VBQ=VCQ=2/3VPV, therefore the common-mode voltage V of mode sevencm=(VAQ+VBQ+ VCQ)/3=2/3VPV。
When non-isolated photovoltaic DC-to-AC converter is in mode eight, its working principle is that：
As shown in figure 11, the on off state of three upper bridge arm switching tubes is [0,0,0] (0,0,0,1).Once switching tube S4、S6、 S2Gate source voltage simultaneously be high level, switching tube S4、S6、S2It is in the conduction state, then switching tube S7、S8Shutdown, switching tube S10Conducting, circuit enter freewheeling period.The previous state of the mode be usually lower bridge arm three switching tubes in there are two conducting, By taking mode one enters mode eight as an example, the on off state in [1,0,0] (1,1,0,0) → [0,0,0] (0,0,0,1), such as Figure 11 Shown, other situations are similar.At this point, due to switching tube S7And S8Shutdown, electric current can not be flowed along the path of normal operating conditions Dynamic, the electric current in afterflow inductance will form continuous current circuit along the switching tube that is respectively conducted, and due to DC side clamp switch pipe S10 Presence, each phase point current potential will be clamped to 1/3 VPV；By taking B phases as an example, inductance LfbIn electric current will be along Lfb→ B phase loads →S6→S4→ A phase loads → Lfa→Ra→N→Rb→LfbSequence access afterflow.Similarly, other two-phases are also continuous along similar channels Stream.The point current potential of each phase is 1/3V at this timePV.That is VAQ=VBQ=VCQ=1/3VPV, therefore the common-mode voltage V of mode eightcm=(VAQ+VBQ+ VCQ)/3=1/3VPV。
By analyzing above it is found that since inverter freewheeling period continuous current circuit voltage is clamped respectively to the three of input voltage / mono- and 2/3rds, the common-mode voltage variation range of inverter is from 0 original~VPVIt is reduced to 1/3VPV~2/3VPV, become Change amplitude becomes smaller, and common mode leakage current may make to be inhibited, and reduces the electromagnetic interference of system, improves power quality, reduces Electric network distortion rate, reduces unnecessary power loss, ensure that the safety of the person and equipment.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape At technical solution, fall within the scope of protection required by the present invention.

Claims (10)

1. a kind of control method of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase, which is characterized in that the inverter packet Include first switch pipe（S1）, second switch pipe（S2）, third switching tube（S3）, the 4th switching tube（S4）, the 5th switching tube（S5）, Six switching tubes（S6）, upper dc switch pipe（S7）, lower dc switch pipe（S8）, upper clamp switch pipe（S9）With lower clamp switch pipe （S10）, this approach includes the following steps：
The first step, by ten switch the non-isolated photovoltaic DC-to-AC converters of Clamp three-phase operation mode be divided into six normal work mode and Two afterflow mode；
A phase sinusoidal modulation waves in inverter are denoted as by second stepV ra , B phase sinusoidal modulation waves are denoted asV rb , C phase sinusoidal modulation waves It is denoted asV rc , by three road sinusoidal modulation wavesV ra 、V rb 、V rc Respectively preprocessed signal is obtained by comparing device with carrier triangular wave VcV g1、V g2、V g3、V g4、V g5、V g6；
Third step, by preprocessed signalV g1、V g3WithV g5It does and obtains signal V with operationx, by preprocessed signalV g4、V g6WithV g2Do with Operation obtains signal Vy, by preprocessed signal Vg1、Vg3、Vg5Three road signals, tri- road signals of Zai Jiang are obtained after doing same or operation two-by-two It does and obtains signal V with operationt；
4th step, to signal VtIt does logical not operation and respectively obtains dc switch pipe（S7）Grid source control signal Vgs7Under and Dc switch pipe（S8）Grid source control signal Vgs8；
5th step, by signal VxWith signal VtIt does and obtains upper clamp switch pipe with operation（S9）Grid source control signal Vgs9, will believe Number VyWith signal VtIt does and obtains lower clamp switch pipe with operation（S10）Grid source control signal Vgs10；
6th step, by signal VxRespectively with preprocessed signal Vg1、Vg3And Vg5Do or operation after obtain first switch pipe successively（S1） Grid source control signal Vgs1, third switching tube（S3）Grid source control signal Vgs3With the 5th switching tube（S5）Grid source control letter Number Vgs5, by signal VyRespectively with preprocessed signal Vg4、Vg6And Vg2Do or operation after obtain the 4th switching tube successively（S4）Grid source Control signal Vgs4, the 6th switching tube（S6）Grid source control signal Vgs6With second switch pipe（S2）Grid source control signal Vgs2。
2. a kind of control method of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase according to claim 1, feature It is, the first switch pipe（S1）, second switch pipe（S2）, third switching tube（S3）, the 4th switching tube（S4）, the 5th switch Pipe（S5）, the 6th switching tube（S6）For bridge arm switching tube, the bridge arm switching tube carries out turn-on and turn-off by SPWM control modes.
3. a kind of control method of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase according to claim 2, feature It is, in the first step, when inverter is in normal work mode, if upper dc switch pipe（S7）With lower dc switch pipe（S8） It is in the conduction state, then go up clamp switch pipe（S9）With lower clamp switch pipe（S10）It is in off state.
4. a kind of control method of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase according to claim 3, feature It is, when inverter is in normal work mode, first switch pipe（S1）Grid source control waveform Vgs1With the 4th switching tube （S4）Grid source control waveform Vgs4On the contrary, third switching tube（S3）Grid source control waveform Vgs3With the 6th switching tube（S6）Grid Source controls waveform Vgs6On the contrary, the 5th switching tube（S5）Grid source control waveform Vgs5With second switch pipe（S2）Grid source control wave Shape Vgs2On the contrary.
5. a kind of control method of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase according to claim 4, feature It is, the grid source control waveform Vgs1、Vgs3、Vgs5For 120 ° of SPWM waveforms of phase mutual deviation.
6. a kind of control method of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase according to claim 2, feature It is, in the first step, when inverter is in afterflow mode, if first switch pipe（S1）, third switching tube（S3）, the 5th switch Pipe（S5）It simultaneously turns on, then upper dc switch pipe（S7）With lower dc switch pipe（S8）Shutdown, while upper clamp switch pipe（S9）It leads It is logical；If the 4th switching tube（S4）, the 6th switching tube（S6）, second switch pipe（S2）It simultaneously turns on, then upper dc switch pipe（S7）With Lower dc switch pipe（S8）Shutdown, with clamp switch pipe at present（S10）Conducting.
7. special according to a kind of control method of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase of claim 3 or 6 Sign is, in the first step, in the inverter course of work, can calculate the common-mode voltage of inverter according to the following formula：
Vcm=(VAQ+VBQ+VCQ)/3
Wherein, VcmFor the common-mode voltage of inverter, VAQFor A phase point current potentials, VBQFor B phase point current potentials, VCQFor C phase point current potentials.
8. a kind of control method of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase according to claim 1, feature It is, in second step, A phase sinusoidal modulation waves VraWith carrier triangular wave VcIt hands over to cut and generates first switch pipe（S1）Preprocessed signal Vg1, by preprocessed signal Vg1Logic NOT is taken to generate the 4th switching tube（S4）Preprocessed signal Vg4；B phase sinusoidal modulation waves VrbWith Carrier triangular wave VcIt hands over to cut and generates third switching tube（S3）Preprocessed signal Vg3, by preprocessed signal Vg3Logic NOT is taken to generate the Six switching tubes（S6）Preprocessed signal Vg6；C phases sinusoidal modulation wave and carrier triangular wave VcIt hands over to cut and generates the 5th switching tube（S5）'s Preprocessed signal Vg5, by preprocessed signal Vg5Logic NOT is taken to generate second switch pipe（S2）Preprocessed signal Vg2。
9. a kind of control method of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase according to claim 1, feature It is, in the first step, in the inverter course of work, it is assumed that the on off state of single switching transistor is Sx, and x=1,3,5,7,8, 9,10, then the S when single switching transistor is in the conduction statex=1, the S when single switching transistor is off statex=0；
The first switch pipe（S1）, third switching tube（S3）, the 5th switching tube（S5）For upper bridge arm switching tube, bridges are gone up by three The on off state of arm switch pipe is denoted as [S1,S3,S5]( S7,S8,S9, S10)。
10. a kind of control method of the ten switches non-isolated photovoltaic DC-to-AC converter of Clamp three-phase according to claim 9, feature Be, when inverter is in normal work mode, the on off states of three upper bridge arm switching tubes be [1,0,0] (1,1,0, 0), [1,1,0] (1,1,0,0), [0,1,0] (1,1,0,0), [0,1,1] (1,1,0,0), [0,0,1] (1,1,0,0) and [1,0,1] (1,1,0,0)；When inverter is in afterflow mode, the on off state of three upper bridge arm switching tubes is [1,1,1] (0,0,1,0) and [0,0,0] (0,0,0,1).
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110460259A (en) * 2019-07-25 2019-11-15 南京邮电大学 Ten switch of one kind staggeredly clamps three-phase photovoltaic inverter topological structure
CN110896285A (en) * 2019-07-25 2020-03-20 南京邮电大学 Non-isolation clamping type three-phase Heric photovoltaic inverter topology
CN111293871A (en) * 2020-03-29 2020-06-16 西南交通大学 Leakage current suppression method for three-phase four-bridge-arm Z-source inverter
CN111682793A (en) * 2020-01-17 2020-09-18 西南石油大学 Low-leakage-current improved H8 type non-isolated three-phase grid-connected inverter
CN111697866A (en) * 2020-07-17 2020-09-22 西南石油大学 Low-leakage-current non-isolated three-phase photovoltaic grid-connected inverter and system based on auxiliary power supply
CN111697865A (en) * 2020-07-17 2020-09-22 西南石油大学 Direct-current clamping low-leakage-current non-isolated three-phase photovoltaic grid-connected inverter and grid-connected system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000102265A (en) * 1998-09-25 2000-04-07 Daihen Corp Power conversion device for photovoltaic power generation
CN103117668A (en) * 2013-02-26 2013-05-22 哈尔滨工业大学 Simplified five-phase and three-level voltage source inverter and vector control method thereof
CN104038094A (en) * 2014-04-01 2014-09-10 燕山大学 Non-isolated three-phase photovoltaic grid-connected inverter and control method
CN106849728A (en) * 2017-03-15 2017-06-13 南京邮电大学 The control method of the Clamp three-phase non-isolated photovoltaic DC-to-AC converter with continued flow switch
CN106877716A (en) * 2017-03-15 2017-06-20 南京邮电大学 A kind of Clamp three-phase non-isolated photovoltaic DC-to-AC converter with continued flow switch

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000102265A (en) * 1998-09-25 2000-04-07 Daihen Corp Power conversion device for photovoltaic power generation
CN103117668A (en) * 2013-02-26 2013-05-22 哈尔滨工业大学 Simplified five-phase and three-level voltage source inverter and vector control method thereof
CN104038094A (en) * 2014-04-01 2014-09-10 燕山大学 Non-isolated three-phase photovoltaic grid-connected inverter and control method
CN106849728A (en) * 2017-03-15 2017-06-13 南京邮电大学 The control method of the Clamp three-phase non-isolated photovoltaic DC-to-AC converter with continued flow switch
CN106877716A (en) * 2017-03-15 2017-06-20 南京邮电大学 A kind of Clamp three-phase non-isolated photovoltaic DC-to-AC converter with continued flow switch

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
XIAOQIANG GUO等: "Three-phase DC-bypass topologies with reduced leakage current for transformerless PV systems", 《2015 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)》 *
韩晨: "非隔离三相光伏逆变器漏电流抑制方法研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 *
韩朋乐: "一种H8拓扑单相非隔离光伏并网逆变器", 《通信电源技术》 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110460259A (en) * 2019-07-25 2019-11-15 南京邮电大学 Ten switch of one kind staggeredly clamps three-phase photovoltaic inverter topological structure
CN110896285A (en) * 2019-07-25 2020-03-20 南京邮电大学 Non-isolation clamping type three-phase Heric photovoltaic inverter topology
CN110460259B (en) * 2019-07-25 2021-06-22 南京邮电大学 Ten-switch staggered clamping three-phase photovoltaic inverter topological structure
CN110896285B (en) * 2019-07-25 2021-09-14 南京邮电大学 Non-isolation clamping type three-phase Heric photovoltaic inverter topology
CN111682793A (en) * 2020-01-17 2020-09-18 西南石油大学 Low-leakage-current improved H8 type non-isolated three-phase grid-connected inverter
CN111682793B (en) * 2020-01-17 2021-09-17 西南石油大学 Low-leakage-current improved H8 type non-isolated three-phase grid-connected inverter
CN111293871A (en) * 2020-03-29 2020-06-16 西南交通大学 Leakage current suppression method for three-phase four-bridge-arm Z-source inverter
CN111293871B (en) * 2020-03-29 2021-04-13 西南交通大学 Leakage current suppression method for three-phase four-bridge-arm Z-source inverter
CN111697866A (en) * 2020-07-17 2020-09-22 西南石油大学 Low-leakage-current non-isolated three-phase photovoltaic grid-connected inverter and system based on auxiliary power supply
CN111697865A (en) * 2020-07-17 2020-09-22 西南石油大学 Direct-current clamping low-leakage-current non-isolated three-phase photovoltaic grid-connected inverter and grid-connected system
CN111697865B (en) * 2020-07-17 2022-06-21 西南石油大学 Direct-current clamping low-leakage-current non-isolated three-phase photovoltaic grid-connected inverter and grid-connected system

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