CN106849728B - The control method of the non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch - Google Patents
The control method of the non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch Download PDFInfo
- Publication number
- CN106849728B CN106849728B CN201710152426.2A CN201710152426A CN106849728B CN 106849728 B CN106849728 B CN 106849728B CN 201710152426 A CN201710152426 A CN 201710152426A CN 106849728 B CN106849728 B CN 106849728B
- Authority
- CN
- China
- Prior art keywords
- switching tube
- switch
- phase
- continued flow
- clamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims description 43
- 238000007781 pre-processing Methods 0.000 claims description 34
- 238000001914 filtration Methods 0.000 claims 2
- 230000005611 electricity Effects 0.000 description 7
- 238000012913 prioritisation Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000080 chela (arthropods) Anatomy 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- 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
-
- H02J3/383—
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The control method of the invention discloses a kind of non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch, the preprocessed signal for cutting six bridge arm switching tubes of generation inverter is handed over triangular signal all the way by three-phase sine-wave signal, by the judgement to six road preprocessed signal states, determine that inverter is in non-continued flow switch state or continued flow switch state.When inverter is in non-continued flow switch mode, six bridge arm switching tubes carry out Three-phase SPWM modulation control, and continued flow switch pipe and two clamp switch pipes are held off；When inverter is in continued flow switch mode, six bridge arm switching tubes are all held off, and continued flow switch pipe conducting, clamp switch pipe is selectively connected by situation.The present invention makes inverter eliminate this link of energy feedback power, improves the transfer efficiency of non-isolated photovoltaic DC-to-AC converter, it is suppressed that the common mode leakage current of photovoltaic DC-to-AC converter.
Description
Technical field
The present invention relates to power electronics DC-AC converter technique fields, especially the Clamp three-phase with continued flow switch
The control method of non-isolated photovoltaic DC-to-AC converter.
Background technique
Photovoltaic combining inverter requirement is high-efficient, at low cost, is able to bear photovoltaic cell output voltage and fluctuates greatly bad
It influences, and its exchange output will also meet higher power quality.
Isolated form and non-isolation type can be divided into according to whether inverter has isolating transformer.Isolated form photovoltaic DC-to-AC converter
The electrical isolation for realizing power grid and solar panel has ensured the person and equipment safety.But its volume is big, and price is high, system changeover
Efficiency is lower.Non-isolated photovoltaic DC-to-AC converter structure is free of transformer, and it is many to have that high-efficient, small in size, light weight and cost is low etc.
Advantage.
Currently, the peak efficiency of non-isolated photovoltaic inverter system can achieve 98% or more.But the removal of transformer
So that there is electrical connection between input and output, due to the presence of solar panel direct-to-ground capacitance, inverter can generate common mode when working
Leakage current increases system electromagnetic interference, influences the quality of grid current, the harm person and equipment safety.
Summary of the invention
Clamp with continued flow switch is provided the technical problem to be solved by the present invention is to overcome the deficiencies in the prior art
The control method of the non-isolated photovoltaic DC-to-AC converter of three-phase, the non-isolated photovoltaic inversion of Clamp three-phase of junction belt continued flow switch of the present invention
The main circuit topology of device gives its control method, and it is inverse to have given full play to the non-isolated photovoltaic of Clamp three-phase with continued flow switch
The characteristics of becoming device has preferable practical application value.
The present invention uses following technical scheme to solve above-mentioned technical problem:
The control method of the non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch proposed according to the present invention, band are continuous
The non-isolated photovoltaic DC-to-AC converter of Clamp three-phase of stream switch includes solar battery, three-phase bridge type converter, filter circuit, load
Circuit, continued flow switch and clamp circuit；Three-phase bridge type converter include the first to the 6th switching tube, filter circuit include first to
Third filter inductance and first is to third filter capacitor, and load circuit includes first to 3rd resistor, and continued flow switch includes the 7th
Switching tube and three-phase uncontrollable rectifier bridge, three-phase uncontrollable rectifier bridge include the first to the 6th rectifier diode, and clamp circuit includes the
One to third capacitor, upper clamp switch pipe and lower clamp switch pipe；Wherein,
The anode of solar battery and the anode of first capacitor, the drain electrode of first switch tube, the drain electrode of third switching tube, the
The drain electrode of five switching tubes is respectively connected with, the cathode of the cathode of solar battery and third capacitor, the source electrode of the 4th switching tube, the 6th
The source electrode of switching tube, the source electrode of second switch are respectively connected with, the drain electrode of the source electrode of first switch tube and the 4th switching tube, first
One end of filter inductance, the first rectifier diode anode be separately connected, the leakage of the source electrode of third switching tube and the 6th switching tube
Pole, one end of the second filter inductance, the second rectifier diode anode be separately connected, the source electrode and second switch of the 5th switching tube
The drain electrode of pipe, one end of third filter inductance, third rectifier diode anode be separately connected, the cathode of first capacitor and second
The drain electrode of positive, the upper clamp switch pipe of capacitor is separately connected, and the cathode of the second capacitor is opened with positive, the lower clamp of third capacitor
The source electrode for closing pipe is separately connected, the source electrode of the source electrode of upper clamp switch pipe and the 7th switching tube, the 4th rectifier diode anode,
The anode of 5th rectifier diode, the anode of the 6th rectifier diode are separately connected, and the drain electrode of lower clamp switch pipe is opened with the 7th
Close the drain electrode of pipe, the cathode difference of the cathode of the first rectifier diode, the cathode of the second rectifier diode, third rectifier diode
Connection, the anode of the first rectifier diode connect with the cathode of the 4th rectifier diode, the anode of the second rectifier diode and the
The cathode of five rectifier diodes connects, and the anode of third rectifier diode is connect with the cathode of the 6th rectifier diode, the first filter
The other end of wave inductance is separately connected with the anode of the first filter capacitor, one end of first resistor, the second filter inductance it is another
End is separately connected with the anode of the second filter capacitor, one end of second resistance, and the other end and third of third filter inductance filter
The anode of capacitor, one end of 3rd resistor are separately connected, the cathode of the cathode of the first filter capacitor and the second filter capacitor, third
The cathode of filter capacitor, the other end of first resistor, the other end of second resistance, 3rd resistor the other end be separately connected；
The control method of the non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch is as follows:
It is divided into both modalities which in an inversion period: non-afterflow mode and afterflow mode；Wherein, the first to the 6th switch
Pipe carries out Three-phase SPWM modulation control in the non-afterflow mode of inverter, and in afterflow mode, the first to the 6th switching tube is whole
It is held off；Upper clamp switch pipe, lower clamp switch pipe and the 7th switching tube are whole in the non-afterflow mode of inverter
It is held off, in afterflow mode, the 7th switching tube is held on, and upper clamp switch pipe, lower clamp switch pipe are staggeredly led
It is logical.
Control method as the Clamp three-phase non-isolated photovoltaic DC-to-AC converter of the present invention with continued flow switch is into one
Prioritization scheme is walked, in Three-phase SPWM modulation, is connected entirely or the if there is first switch tube, third switching tube and the 5th switching tube
Two switching tubes, the 4th switching tube and the 6th switching tube are then afterflow mode when being connected entirely, and first to the 6th opens during afterflow mode
Closing Guan Youyuan active state is the state that is turned off, the 7th switching tube afterflow conducting, upper clamp switch pipe, lower clamp switch pipe
It is selectively connected according to afterflow reason, if the afterflow caused by first switch tube, third switching tube and the 5th switching tube are connected entirely
Upper clamp switch pipe conducting, lower clamp if the afterflow caused by second switch, the 4th switching tube and the 6th switching tube are connected entirely
Switching tube conducting；Therefore the non-continued flow switch mode of inverter shares 6 in an inversion period, and continued flow switch mode shares 2
It is a；
Define inverter switching states be [M 1,M 3,M 5,M 7,M H,M L], whereinM 1For the state of first switch tube,M 3It is
The state of three switching tubes,M 5The state of 5th switching tube,M 7For the state of the 7th switching tube,M HFor the state of upper clamp switch pipe,M LFor the state of lower clamp switch pipe；
If first switch tube opens the shutdown of the 4th switching tubeM 1=1, if third switching tube opens the shutdown of the 6th switching tubeM 3=1, if the 5th switching tube opens second switch shutdownM 5=1, if the 4th switching tube opens first switch tube shutdownM 1=
0, if the 6th switching tube opens the shutdown of third switching tubeM 3=0, if second switch opens the shutdown of the 5th switching tubeM 5=0,
If the first to the 6th switching tube is turned off,M 1,M 3,M 5It is indicated with Z, if the conducting of the 7th switching tubeM 7=1, if the 7th switch
Pipe turns off thenM 7=0, if the conducting of upper clamp switch pipeM H=1, if upper clamp switch pipe is closedM H=0, if lower clamp switch
Pipe is connected thenM L=1, if lower clamp switch pipe is closedM L=0；
Therefore inverter 6 non-continued flow switch mode be respectively [1,0,0,0,0,0], [1,1,0,0,0,0], [0,1,0,
0,0,0], [0,1,1,0,0,0], [0,0,1,0,0,0] and [1,0,1,0,0,0], 2 continued flow switch mode be respectively [Z, Z,
Z, 1,1,0] and [Z, Z, Z, 1,0,1].
Control method as the Clamp three-phase non-isolated photovoltaic DC-to-AC converter of the present invention with continued flow switch is into one
Prioritization scheme is walked, generates the control signal of each switching tube as follows:
(1) it generates the sinusoidal modulation wave of 120 ° of a, b, c three-phase phase mutual deviation and triangular wave, three phase sine modulates wavelength-division all the way
It does not hand over and cuts with triangular wave, wherein a phase sinusoidal modulation wave and triangular wave hand over the pre-processing waveform for cutting and generating first switch tubeV gs1',
Negated the pre-processing waveform for generating the 4th switching tubeV gs4'；B phase sinusoidal modulation wave and triangular wave, which are handed over to cut, generates third switch
The pre-processing waveform of pipeV gs3', negated the pre-processing waveform for generating the 6th switching tubeV gs6'；Third road sinusoidal modulation wave with
Triangular wave hands over the pre-processing waveform for cutting and generating the 5th switching tubeV gs5', negated the pre-processing waveform for generating second switchV gs2'；
(2) by pre-processing waveformV gs1’、V gs3' andV gs5' do and obtain signal with operationV H', by pre-processing waveformV gs4’、V gs6' andV gs2' do and obtain signal with operationV L', by pre-processing waveformV gs1’、V gs3' andV gs5' do together or obtained after operation two-by-two
Three road signals do obtain signal with operation againV t'；
(3) by signalV H' and signalV t' do with operation obtain upper clamp switch pipe grid source control waveformV gsH, by signalV L' and signalV t' do with operation obtain lower clamp switch pipe grid source control waveformV gsL；
(4) byV gsHWithV gsLIt does or operation obtains the 7th switching tube grid source control waveformV gs7；
(5) willV gsHNegate rear and pre-processing waveformV gs1’、V gs3' andV gs5' do respectively and obtain first switch tube after operation
Grid source control waveformV gs1, third switching tube grid source control waveformV gs3Waveform is controlled with the grid source of the 5th switching tubeV gs5；It willV gsLNegate rear and pre-processing waveformV gs4’、V gs6' andV gs2' do respectively with obtained after operation the 4th switching tube grid source control wave
ShapeV gs4, the 6th switching tube grid source control waveformV gs6Waveform is controlled with the grid source of second switchV gs2。
Control method as the Clamp three-phase non-isolated photovoltaic DC-to-AC converter of the present invention with continued flow switch is into one
Prioritization scheme is walked, uses two inputs to adopt with door CD4081 chip and three inputs with the realization of door CD4073 chip or operation with operation
It is realized with two inputs or door CD4071 chip, negating is realized using CD4049 chip.
Control method as the Clamp three-phase non-isolated photovoltaic DC-to-AC converter of the present invention with continued flow switch is into one
Prioritization scheme is walked, same or operation is realized using CD4077 chip.
The invention adopts the above technical scheme compared with prior art, has following technical effect that and does not use space vector
Control, thus both can be adapted for simulation control be equally applicable to it is digital control；Control program include non-afterflow Model control and
Afterflow Model control need to switch switch state to realize its control, and handoff procedure can be light by logic judgment and logical operation
Pine nut is existing；The introducing of non-afterflow mode, reduces the common-mode voltage of inverter, reduces loss, improves inverter efficiency.
Detailed description of the invention
Fig. 1 is the non-isolated photovoltaic DC-to-AC converter topology of the applicable Clamp three-phase with continued flow switch of the present invention.
Fig. 2 (a) is pre-processing waveformV gs1’、V gs4’、V gs3’、V gs6’、V gs5' andV gs2' production method.
Fig. 2 (b) is control signal generating method.
Fig. 3 is the non-isolated photovoltaic DC-to-AC converter driving signal timing diagram of the Clamp three-phase with continued flow switch.
The non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch when Fig. 4 (a) is in mode 1.
The non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch when Fig. 4 (b) is in mode 2.
The non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch when Fig. 4 (c) is in mode 3.
The non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch when Fig. 4 (d) is in mode 4.
The non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch when Fig. 4 (e) is in mode 5.
The non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch when Fig. 4 (f) is in mode 6.
The non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch when Fig. 4 (g) is in mode 7.
The non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch when Fig. 4 (h) is in mode 8.
Appended drawing reference in figure is explained are as follows:U PVFor solar battery,S 1- S 7Respectively first to the 7th switching tube,L a、L b、L cRespectively first to third filter inductance,C fa、C fb、C fcRespectively first to third filter capacitor,R a、 R b 、 R c Respectively
It is first to 3rd resistor,D a1、 D b1、 D c1、D a2、 D b2、D c2Respectively first to the 6th rectifier diode,C dc1、C dc2、C dc3
Respectively first to third capacitor,S HFor upper clamp switch pipe,S LFor lower clamp switch pipe.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing:
The control method of the non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch is only applicable to continued flow switch
The non-isolated photovoltaic DC-to-AC converter of Clamp three-phase (inverter circuit topology is as shown in Fig. 1), a kind of Clamp with continued flow switch
The non-isolated photovoltaic DC-to-AC converter of three-phase, including solar batteryU PV, three-phase bridge type converter, filter circuit and load circuit, also wrap
Continued flow switch and clamp circuit are included, three-phase bridge type converter includes the first to the 6th switching tubeS 1- S 6, filter circuit includes first
To third filter inductanceL a、L b、L cWith first to third filter capacitorC fa、C fb、C fc, load circuit includes first to 3rd resistorR a、R b、 R c , continued flow switch includes the 7th switching tubeS 7With three-phase uncontrollable rectifier bridge, three-phase uncontrollable rectifier bridge includes first to the
Six rectifier diodesD a1、 D b1、 D c1、D a2、 D b2、D c2, clamp circuit includes first to third capacitorC dc1、C dc2、C dc3, upper pincers
Bit switch pipeS HWith lower clamp switch pipeS L；Wherein,
The anode of solar battery and the anode of first capacitor, the drain electrode of first switch tube, the drain electrode of third switching tube, the
The drain electrode of five switching tubes is respectively connected with, the cathode of the cathode of solar battery and third capacitor, the source electrode of the 4th switching tube, the 6th
The source electrode of switching tube, the source electrode of second switch are respectively connected with, the drain electrode of the source electrode of first switch tube and the 4th switching tube, first
One end of filter inductance, the first rectifier diode anode be separately connected, the leakage of the source electrode of third switching tube and the 6th switching tube
Pole, one end of the second filter inductance, the second rectifier diode anode be separately connected, the source electrode and second switch of the 5th switching tube
The drain electrode of pipe, one end of third filter inductance, third rectifier diode anode be separately connected, the cathode of first capacitor and second
The drain electrode of positive, the upper clamp switch pipe of capacitor is separately connected, and the cathode of the second capacitor is opened with positive, the lower clamp of third capacitor
The source electrode for closing pipe is separately connected, the source electrode of the source electrode of upper clamp switch pipe and the 7th switching tube, the 4th rectifier diode anode,
The anode of 5th rectifier diode, the anode of the 6th rectifier diode are separately connected, and the drain electrode of lower clamp switch pipe is opened with the 7th
Close the drain electrode of pipe, the cathode difference of the cathode of the first rectifier diode, the cathode of the second rectifier diode, third rectifier diode
Connection, the anode of the first rectifier diode connect with the cathode of the 4th rectifier diode, the anode of the second rectifier diode and the
The cathode of five rectifier diodes connects, and the anode of third rectifier diode is connect with the cathode of the 6th rectifier diode, the first filter
The other end of wave inductance is separately connected with the anode of the first filter capacitor, one end of first resistor, the second filter inductance it is another
End is separately connected with the anode of the second filter capacitor, one end of second resistance, and the other end and third of third filter inductance filter
The anode of capacitor, one end of 3rd resistor are separately connected, the cathode of the cathode of the first filter capacitor and the second filter capacitor, third
The cathode of filter capacitor, the other end of first resistor, the other end of second resistance, 3rd resistor the other end be separately connected.
First to 3rd resistorR a、 R b 、 R c Respectively as A phase load, B phase load, C phase load.
The control method will generate six bridge arm switches in the non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch
PipeS 1、S 2、S 3、S 4、S 5WithS 6, upper clamp switch pipeS H, lower clamp switch pipeS LWith the 7th switching tubeS 7The control of totally nine switching tubes
Signal processed, the 7th switching tube are continued flow switch pipe.Control process is divided into the non-afterflow mode of both modalities which in an inversion period
With afterflow mode.Six of them bridge arm switching tube carries out Three-phase SPWM modulation control in the non-afterflow mode of inverter, continuous
State is all held off when flowing mode.Two clamp switch pipes and continued flow switch pipe are whole in the non-afterflow mode of inverter
It is held off, in afterflow mode, continued flow switch pipe is held on, and two clamp switch pipes are staggeredly connected.
It is connected entirely when bridge arm upper tube occurs in Three-phase SPWM modulation control or is afterflow mode when down tube is connected entirely, afterflow mode
Six bridge arm switching tubes of period will be full off state, continued flow switch pipe afterflow conducting, clamp switch by former active state
Pipe is selectively connected according to afterflow reason, if the afterflow caused by upper tube is connected entirelyS HConducting, if continuous caused by down tube is connected entirely
Stream is thenS LConducting.Therefore the non-continued flow switch mode of inverter shares 6 in an inversion period, and continued flow switch mode shares 2
It is a.Define inverter switching states be [M 1,M 3,M 5,M 7,M H,M L], whereinM 1For the state of first switch tube,M 3It is opened for third
The state of pipe is closed,M 5The state of 5th switching tube,M 7For the state of the 7th switching tube,M HFor the state of upper clamp switch pipe,M LFor
The state of lower clamp switch pipe；
If first switch tube opens the shutdown of the 4th switching tubeM 1=1, if third switching tube opens the shutdown of the 6th switching tubeM 3=1, if the 5th switching tube opens second switch shutdownM 5=1, the 4th switching tube opens first switch tube shutdown thenM 1=0,
Six switching tube of Ruo opens the shutdown of third switching tube thenM 3=0, if second switch opens the shutdown of the 5th switching tubeM 5=0, if
First to the 6th switching tube is turned off, thenM 1,M 3,M 5It is indicated with Z, if the conducting of the 7th switching tubeM 7=1, if the 7th switching tube
Shutdown is thenM 7=0, if the conducting of upper clamp switch pipeM H=1, if upper clamp switch pipe is closedM H=0, if lower clamp switch pipe
Conducting is thenM L=1, if lower clamp switch pipe is closedM L=0；
Therefore inverter 6 non-continued flow switch mode be respectively [1,0,0,0,0,0], [1,1,0,0,0,0], [0,1,0,
0,0,0], [0,1,1,0,0,0], [0,0,1,0,0,0] and [1,0,1,0,0,0], 2 continued flow switch mode be respectively [Z, Z,
Z, 1,1,0] and [Z, Z, Z, 1,0,1].Shown in eight kinds of switch mode such as 4 (a)-Fig. 4 (h) of attached drawing.
Shown in technical solution of the invention i.e. specific control signal producing method such as attached drawing 2 (a), Fig. 2 (b):
(1) generate the sinusoidal modulation wave and triangular wave all the way of three 120 ° of tunnel phase mutual deviations, three road sinusoidal modulation waves respectively with
Triangular wave, which is handed over, to be cut, and wherein first via sinusoidal modulation wave and triangular wave hand over the pre-processing waveform for cutting and generating first switch tubeV gs1', it will
It negates the pre-processing waveform for generating the 4th switching tubeV gs4'；Second road sinusoidal modulation wave and triangular wave, which are handed over to cut, generates third switch
The pre-processing waveform of pipeV gs3', negated the pre-processing waveform for generating the 6th switching tubeV gs6'；Third road sinusoidal modulation wave with
Triangular wave hands over the pre-processing waveform for cutting and generating the 5th switching tubeV gs5', negated the pre-processing waveform for generating second switchV gs2’。
(2) by pre-processing waveformV gs1’、V gs3' andV gs5' do and obtain signal with operationV H', by pre-processing waveformV gs4’、V gs6' andV gs2' do and obtain signal with operationV L', by pre-processing waveformV gs1’、V gs3' andV gs5' do together or obtained after operation two-by-two
Three road signals do obtain signal with operation againV t’。
(3) by signalV H' and signalV t' do and obtain upper clamp switch pipe with operationS HGrid source control waveformV gsH, will believe
NumberV L' and signalV t' do and obtain lower clamp switch pipe with operationS LGrid source control waveformV gsL。
(4) byV gsHWithV gsLIt does or operation obtains continued flow switch pipeS 7Grid source controls waveformV gs7。
(5) willV gsHAfter negating respectively with pre-processing waveformV gs1’、V gs3' andV gs5' do and obtain first switch tube after operationS 1Grid source control waveformV gs1, third switching tubeS 3Grid source control waveformV gs3With the 5th switching tubeS 5Grid source control waveformV gs5.It willV gsLAfter negating respectively with pre-processing waveformV gs4’、V gs6' andV gs2' do and obtain the 4th switching tube after operationS 4Grid
Source controls waveformV gs4, the 6th switching tubeS 6Grid source control waveformV gs6And second switchS 2Grid source control waveformV gs2。
As shown in figure 3, giving control sequential figure of the present invention, waveform is respectively as follows: first switch tube from top to bottom in figureS 1
Grid source control waveformV gs1；4th switching tubeS 4Grid source control waveformV gs4；Third switching tubeS 3Grid source control waveformV gs3；
6th switching tubeS 6Grid source control waveformV gs6；5th switching tubeS 5Grid source control waveformV gs5；Second switchS 2Grid source
Control waveformV gs2；Continued flow switch pipeS 7Grid source controls waveformV gs7；Upper clamp switch pipeS HGrid source control waveformV gsH；Lower clamp
Switching tubeS LGrid source control waveformV gsL。
Respectively correspond above-mentioned [1,0,0,0,0,0], [1,1,0,0,0,0], [0,1,0,0,0,0], [0,1,1,0,0,
0], [0,0,1,0,0,0], [1,0,1,0,0,0], [Z, Z, Z, 1,1,0] and [Z, Z, Z, 1,0,1] eight kinds of switch states.Below
The working principle of inverter when briefly introducing each operation mode:
Mode 1:
As shown in Fig. 4 (a), in [1,0,0,0,0,0] switch state, switching tubeS 1、S 6WithS 2Gate source voltage be high electricity
It is flat,S 1、S 6WithS 2It is in the conductive state；Switching tubeS 3、S 4、S 5、S 7、S HWithS LGate source voltage be zero,S 3、S 4、S 5、S 7、S HWithS L
It is in an off state.Electric current is flowed out from positive pole, is flowed throughS 1—L a- A phase load-midpointN- B phase load, C phase load-L b、L c—S 2、S 6 , finally flow back to power cathode.At this timeV AQ=V PV,V BQ=V CQ=0, therefore common-mode voltageV cm=(V AQ+V BQ+V CQ)/3=
1/3V PV。
Mode 2:
As shown in Fig. 4 (b), in [1,1,0,0,0,0] switch state, switching tubeS 1、S 3WithS 2Gate source voltage be high electricity
It is flat,S 1、S 3WithS 2It is in the conductive state；Switching tubeS 4、S 5、S 6、S 7、S HWithS LGate source voltage be zero,S 4、S 5、S 6、S 7、S HWithS L
It is in an off state.Electric current is flowed out from positive pole, is flowed throughS 1、S 3—L a、L b- A phase load, B phase load-midpointN- C phase
Load-L c—S 2, finally flow back to power cathode.At this timeV AQ= V BQ=V PV,V CQ=0, therefore common-mode voltageV cm=(V AQ+V BQ+V CQ)/3
=2/3V PV。
Mode 3:
As shown in Fig. 4 (c), in [0,1,0,0,0,0] switch state, switching tubeS 4、S 3WithS 2Gate source voltage be high electricity
It is flat,S 4、S 3WithS 2It is in the conductive state；Switching tubeS 1、S 5、S 6、S 7、S HWithS LGate source voltage be zero,S 1、S 5、S 6、S 7、S HWithS L
It is in an off state.Electric current is flowed out from positive pole, is flowed throughS 3—L b- B phase load-midpointN- A phase load, C phase load-L a、L c—S 4、S 2 , finally flow back to power cathode.At this timeV BQ=V PV,V AQ=V CQ=0, therefore common-mode voltageV cm=(V AQ+V BQ+V CQ)/3=
1/3V PV。
Mode 4:
As shown in Fig. 4 (d), in [0,1,1,0,0,0] switch state, switching tubeS 4、S 3WithS 5Gate source voltage be high electricity
It is flat,S 4、S 3WithS 5It is in the conductive state；Switching tubeS 1、S 2、S 6、S 7、S HWithS LGate source voltage be zero,S 1、S 2、S 6、S 7、S HWithS L
It is in an off state.Electric current is flowed out from positive pole, is flowed throughS 3、S 5—L b、L c- B phase load, C phase load-midpointN- A phase
Load-L a—S 4, finally flow back to power cathode.At this timeV BQ= V CQ=V PV,V AQ=0, therefore common-mode voltageV cm=(V AQ+V BQ+V CQ)/3
=2/3V PV。
Mode 5:
As shown in Fig. 4 (e), in [0,0,1,0,0,0] switch state, switching tubeS 4、S 6WithS 5Gate source voltage be high electricity
It is flat,S 4、S 6WithS 5It is in the conductive state；Switching tubeS 1、S 2、S 3、S 7、S HWithS LGate source voltage be zero,S 1、S 2、S 3、S 7、S HWithS L
It is in an off state.Electric current is flowed out from positive pole, is flowed throughS 5—L c- C phase load-midpointN- A phase load, B phase load-L a、L b—S 4、S 6, finally flow back to power cathode.At this timeV AQ= V BQ=0,V CQ=V PV, therefore common-mode voltageV cm=(V AQ+V BQ+V CQ)/3=
1/3V PV。
Mode 6:
As shown in Fig. 4 (f), in [1,0,1,0,0,0] switch state, switching tubeS 1、S 6WithS 5Gate source voltage be high electricity
It is flat,S 1、S 6WithS 5It is in the conductive state；Switching tubeS 2、S 3、S 4、S 7、S HWithS LGate source voltage be zero,S 2、S 3、S 4、S 7、S HWithS L
It is in an off state.Electric current is flowed out from positive pole, is flowed throughS 1、S 5—L a、L c- A phase load, C phase load-midpointN- B phase
Load-L b—S 6, finally flow back to power cathode.At this timeV AQ= V CQ=V PV,V BQ=0, therefore common-mode voltageV cm=(V AQ+V BQ+V CQ)/3
=2/3V PV。
Mode 7:
Once switching tubeS 1、S 3WithS 5Gate source voltage simultaneously be high level, switching tubeS 1、S 3、S 5It is in the conductive state, that
Switching tubeS 1、S 2、S 3、S 4、S 5WithS 6It needs to immediately turn off,S 7WithS HConducting, circuit enter freewheeling period.The mode it is previous
State is usually that there are two conductings in three switching tubes of upper bridge arm, here by taking mode 2 enters mode 7 as an example, [Z, Z, Z, 1,
1,0] switch state, as shown in Fig. 4 (g), other situations are similar.At this moment inductive current afterflow, electric current followed byL a、L b- A phase
Load, B phase load-midpointN- C phase load-L c—D c1—S 7—D a2、D b2；Freewheeling period, solar panel output end with
Power grid disconnects.Switching tubeS HConducting makeV AQ、V BQ、V CQCurrent potential be clamped to the 2/3 of input voltage.The freewheeling period,V AQ=V BQ= V CQ=2/3V PVTherefore common-mode voltageV cm=(V AQ+V BQ+V CQ)/3=2/3V PV。
Mode 8:
Once switching tubeS 4、S 6WithS 2Gate source voltage simultaneously be high level, switching tubeS 4、S 6、S 2It is in the conductive state, that
Switching tubeS 1、S 2、S 3、S 4、S 5WithS 6It needs to immediately turn off,S 7WithS LConducting, circuit enter freewheeling period.The mode it is previous
There is a conducting in three switching tubes of the usually upper bridge arm of state, here by taking mode 5 enters mode 0 as an example, [Z, Z, Z, 1,
0,1] switch state, as shown in Fig. 4 (h), other situations are similar.Inductive current afterflow, electric current followed byL c- C phase load-
Midpoint N-A phase load, B phase load-L a、L b—D a1、D b1—S 7—D c2；Freewheeling period, solar panel output end and electricity
Net disconnects.Switching tubeS LConducting makeV AQ、V BQ、V CQCurrent potential be clamped to the 1/3 of input voltage.The freewheeling period,V AQ=V BQ=V CQ=1/3V PVTherefore common-mode voltageV cm=(V AQ+V BQ+V CQ)/3=1/3V PV。
By analyze above it is found that since inverter freewheeling period continuous current circuit is clamped to the one third of input voltage or
Half, the common-mode voltage variation range of inverter from original 0 ~V PVIt is reduced to 1/3V PV~2/3V PV, it may be determined that common mode leakage
Electric current is inhibited, and reduces the electromagnetic interference of system, ensure that the safety of the person and equipment.In addition, switchS 7And rectifier bridge
Continuous current circuit is constituted, so that freewheeling period freewheel current is not passed through power supply, eliminates this link of energy feedback power,
Improve the conversion efficiency of inverter.
In conclusion the present invention solves the skills such as the non-isolated photovoltaic DC-to-AC converter common mode leakage current of three-phase is big, conversion efficiency is low
Art problem has certain engineer application to inhibit the non-isolated photovoltaic DC-to-AC converter common mode leakage current of three-phase to provide a method
Value.
Specific embodiments described above has carried out further the purpose of the present invention, technical scheme and beneficial effects
Detailed description, it should be understood that being not limited to this hair the foregoing is merely specific embodiments of the present invention
Bright range, any those skilled in the art, that is made under the premise of not departing from design and the principle of the present invention is equal
Variation and modification, should belong to the scope of protection of the invention.
Claims (5)
1. the control method of the non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch, which is characterized in that band continued flow switch
The non-isolated photovoltaic DC-to-AC converter of Clamp three-phase include solar battery, three-phase bridge type converter, filter circuit, load circuit,
Continued flow switch and clamp circuit；Three-phase bridge type converter includes the first to the 6th switching tube, and filter circuit includes first to third
Filter inductance and first is to third filter capacitor, and load circuit includes first to 3rd resistor, and continued flow switch includes the 7th switch
Pipe and three-phase uncontrollable rectifier bridge, three-phase uncontrollable rectifier bridge include the first to the 6th rectifier diode, clamp circuit include first to
Third capacitor, upper clamp switch pipe and lower clamp switch pipe；Wherein,
The anode of solar battery is opened with the anode of first capacitor, the drain electrode of first switch tube, the drain electrode of third switching tube, the 5th
The drain electrode for closing pipe is respectively connected with, cathode and the cathode of third capacitor, the source electrode of the 4th switching tube, the 6th switch of solar battery
The source electrode of pipe, the source electrode of second switch are respectively connected with, the drain electrode of the source electrode of first switch tube and the 4th switching tube, the first filtering
One end of inductance, the first rectifier diode anode be separately connected, the drain electrode of the source electrode of third switching tube and the 6th switching tube,
One end of two filter inductances, the second rectifier diode anode be separately connected, the source electrode of the 5th switching tube and second switch
Drain electrode, one end of third filter inductance, third rectifier diode anode be separately connected, the cathode of first capacitor and the second capacitor
The drain electrode of positive, upper clamp switch pipe be separately connected, the cathode of the second capacitor and positive, the lower clamp switch pipe of third capacitor
Source electrode be separately connected, the source electrode of the source electrode of upper clamp switch pipe and the 7th switching tube, the anode of the 4th rectifier diode, the 5th
The anode of rectifier diode, the 6th rectifier diode anode be separately connected, the drain electrode of lower clamp switch pipe and the 7th switching tube
Drain electrode, the cathode of the first rectifier diode, the cathode of the second rectifier diode, third rectifier diode cathode connect respectively
It connects, the anode of the first rectifier diode is connect with the cathode of the 4th rectifier diode, the anode of the second rectifier diode and the 5th
The cathode of rectifier diode connects, and the anode of third rectifier diode is connect with the cathode of the 6th rectifier diode, the first filtering
The other end of inductance is separately connected with the anode of the first filter capacitor, one end of first resistor, the other end of the second filter inductance
It is separately connected with the anode of the second filter capacitor, one end of second resistance, the other end and third filtered electrical of third filter inductance
The anode of appearance, one end of 3rd resistor are separately connected, the cathode of the cathode of the first filter capacitor and the second filter capacitor, third filter
The cathode of wave capacitor, the other end of first resistor, the other end of second resistance, 3rd resistor the other end be separately connected；
The control method of the non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch is as follows:
It is divided into both modalities which in an inversion period: non-afterflow mode and afterflow mode；Wherein, the first to the 6th switching tube exists
Three-phase SPWM modulation control is carried out when the non-afterflow mode of inverter, the first to the 6th switching tube is all kept in afterflow mode
Off state；Upper clamp switch pipe, lower clamp switch pipe and the 7th switching tube are all kept in the non-afterflow mode of inverter
Off state, in afterflow mode, the 7th switching tube is held on, and upper clamp switch pipe, lower clamp switch pipe are staggeredly connected.
2. the control method of the Clamp three-phase non-isolated photovoltaic DC-to-AC converter according to claim 1 with continued flow switch,
It is characterized in that, in Three-phase SPWM modulation, is connected entirely or second if there is first switch tube, third switching tube and the 5th switching tube
Switching tube, the 4th switching tube and the 6th switching tube are then afterflow mode when being connected entirely, the first to the 6th switch during afterflow mode
Guan Youyuan active state is the state that is turned off, the 7th switching tube afterflow conducting, upper clamp switch pipe, lower clamp switch pipe root
Selectively be connected according to afterflow reason, if caused afterflow be connected in first switch tube, third switching tube and the 5th switching tube entirely on
The conducting of clamp switch pipe, lower clamp is opened if the afterflow caused by second switch, the 4th switching tube and the 6th switching tube are connected entirely
Close pipe conducting；Therefore the non-continued flow switch mode of inverter shares 6 in an inversion period, and continued flow switch mode shares 2；
Define inverter switching states be [M 1,M 3,M 5,M 7,M H,M L], whereinM 1For the state of first switch tube,M 3It is opened for third
The state of pipe is closed,M 5The state of 5th switching tube,M 7For the state of the 7th switching tube,M HFor the state of upper clamp switch pipe,M LFor
The state of lower clamp switch pipe；
If first switch tube opens the shutdown of the 4th switching tubeM 1=1, if third switching tube opens the shutdown of the 6th switching tubeM 3=1,
If the 5th switching tube opens second switch shutdownM 5=1, if the 4th switching tube opens first switch tube shutdownM 1=0, if the
6th switching tube opens the shutdown of third switching tube thenM 3=0, if second switch opens the shutdown of the 5th switching tubeM 5=0, if first
It is turned off to the 6th switching tube, thenM 1,M 3,M 5It is indicated with Z, if the conducting of the 7th switching tubeM 7=1, if the 7th switching tube turns off
ThenM 7=0, if the conducting of upper clamp switch pipeM H=1, if upper clamp switch pipe is closedM H=0, if lower clamp switch pipe is connected
ThenM L=1, if lower clamp switch pipe is closedM L=0；
Therefore inverter 6 non-continued flow switch mode be respectively [1,0,0,0,0,0], [1,1,0,0,0,0], [0,1,0,0,0,
0], [0,1,1,0,0,0], [0,0,1,0,0,0] and [1,0,1,0,0,0], 2 continued flow switch mode be respectively [Z, Z, Z, 1,
1,0] and [Z, Z, Z, 1,0,1].
3. the control method of the Clamp three-phase non-isolated photovoltaic DC-to-AC converter according to claim 2 with continued flow switch,
It is characterized in that, generates the control signal of each switching tube as follows:
(1) generate the sinusoidal modulation wave and triangular wave all the way of 120 ° of a, b, c three-phase phase mutual deviation, three phase sine modulating wave respectively with
Triangular wave, which is handed over, to be cut, wherein a phase sinusoidal modulation wave and triangular wave hand over the pre-processing waveform for cutting and generating first switch tubeV gs1', by its
Negate the pre-processing waveform for generating the 4th switching tubeV gs4'；B phase sinusoidal modulation wave and triangular wave, which are handed over to cut, generates third switching tube
Pre-processing waveformV gs3', negated the pre-processing waveform for generating the 6th switching tubeV gs6'；Third road sinusoidal modulation wave and triangle
Wave hands over the pre-processing waveform for cutting and generating the 5th switching tubeV gs5', negated the pre-processing waveform for generating second switchV gs2'；
(2) by pre-processing waveformV gs1’、V gs3' andV gs5' do and obtain signal with operationV H', by pre-processing waveformV gs4’、V gs6' andV gs2' do and obtain signal with operationV L', by pre-processing waveformV gs1’、V gs3' andV gs5' three tunnels obtained after same or operation are done two-by-two
Signal does obtain signal with operation againV t'；
(3) by signalV H' and signalV t' do with operation obtain upper clamp switch pipe grid source control waveformV gsH, by signalV L' and
SignalV t' do with operation obtain lower clamp switch pipe grid source control waveformV gsL；
(4) byV gsHWithV gsLIt does or operation obtains the 7th switching tube grid source control waveformV gs7；
(5) willV gsHNegate rear and pre-processing waveformV gs1’、V gs3' andV gs5' do respectively and grid that first switch tube is obtained after operation
Source controls waveformV gs1, third switching tube grid source control waveformV gs3Waveform is controlled with the grid source of the 5th switching tubeV gs5；It willV gsL
Negate rear and pre-processing waveformV gs4’、V gs6' andV gs2' do respectively with obtained after operation the 4th switching tube grid source control waveformV gs4, the 6th switching tube grid source control waveformV gs6Waveform is controlled with the grid source of second switchV gs2。
4. the control method of the Clamp three-phase non-isolated photovoltaic DC-to-AC converter according to claim 3 with continued flow switch,
It is characterized in that, is realized with door CD4081 chip and three inputs with door CD4073 chip with operation using two inputs or operation uses
Two inputs or door CD4071 chip realize that negating is realized using CD4049 chip.
5. the control method of the Clamp three-phase non-isolated photovoltaic DC-to-AC converter according to claim 3 with continued flow switch,
It is characterized in that, same or operation is realized using CD4077 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710152426.2A CN106849728B (en) | 2017-03-15 | 2017-03-15 | The control method of the non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710152426.2A CN106849728B (en) | 2017-03-15 | 2017-03-15 | The control method of the non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106849728A CN106849728A (en) | 2017-06-13 |
| CN106849728B true CN106849728B (en) | 2019-02-01 |
Family
ID=59143805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710152426.2A Active CN106849728B (en) | 2017-03-15 | 2017-03-15 | The control method of the non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106849728B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108390584B (en) * | 2018-02-12 | 2019-12-31 | 南京邮电大学 | Control method of ten-switch clamping type three-phase non-isolated photovoltaic inverter |
| CN108390583B (en) * | 2018-02-12 | 2019-11-29 | 南京邮电大学 | One kind ten switchs the non-isolated photovoltaic DC-to-AC converter topological structure of Clamp three-phase |
| CN110943637B (en) * | 2019-07-25 | 2022-05-03 | 南京邮电大学 | Control method of non-isolated clamping type three-phase Heric photovoltaic inverter |
| CN110460259B (en) * | 2019-07-25 | 2021-06-22 | 南京邮电大学 | Ten-switch staggered clamping three-phase photovoltaic inverter topological structure |
| CN111917322B (en) * | 2020-07-15 | 2022-08-23 | 南京邮电大学 | Control method of single-bus isolation bidirectional clamping ten-switch three-phase inverter |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7920393B2 (en) * | 2007-06-01 | 2011-04-05 | Drs Power & Control Technologies, Inc. | Four pole neutral-point clamped three phase converter with low common mode voltage output |
| CN103346687A (en) * | 2013-06-20 | 2013-10-09 | 东华大学 | Single-phase non-isolated photovoltaic grid-connected inverter topological structure and control method thereof |
| CN104167946A (en) * | 2014-08-16 | 2014-11-26 | 南京邮电大学 | Midpoint clamping type single-phase non-isolated photovoltaic inverter main circuit topology with follow current switch |
| CN104201924A (en) * | 2014-08-16 | 2014-12-10 | 南京邮电大学 | Control method of neutral point clamping type single phase unfenced photovoltaic inverter with subsequent flow switch |
| CN104300822A (en) * | 2014-09-26 | 2015-01-21 | 南京邮电大学 | Method for controlling single-phase non-isolated photovoltaic inverter with follow current clamping switch |
-
2017
- 2017-03-15 CN CN201710152426.2A patent/CN106849728B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106849728A (en) | 2017-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106849728B (en) | The control method of the non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch | |
| CN105978388B (en) | One kind can inhibit leakage current single-phase buck-boost type photovoltaic DC-to-AC converter and its control method | |
| CN108390584B (en) | Control method of ten-switch clamping type three-phase non-isolated photovoltaic inverter | |
| CN107681913A (en) | A kind of ANPC types three-level inverter modulator approach | |
| CN105099249B (en) | High reliability dual input inverter | |
| CN105939126B (en) | A kind of quasi- Z-source inverter of switched inductors type mixing | |
| CN205647288U (en) | Non - isolated form photovoltaic grid -connected inverter | |
| CN107196491B (en) | A kind of double buck gird-connected inverter half period current distortion inhibition system and method | |
| CN107086600A (en) | A kind of solar energy power generating three phase full bridge grid-connected inverting system | |
| CN105186912B (en) | A kind of non-isolated full-bridge grid-connected inverter of two-stage type | |
| CN106877716B (en) | A kind of non-isolated photovoltaic DC-to-AC converter of Clamp three-phase with continued flow switch | |
| CN106712558B (en) | Five level three-phase dual input inverter of high reliability | |
| CN202495887U (en) | Inverter used in photovoltaic power generation | |
| CN104796019B (en) | A kind of Z sources three-level PWM rectifier and its control method | |
| CN106452141A (en) | Three-phase dual-input inverter not having bridge arm shoot-through risk | |
| CN104467501B (en) | Shoot-through-prevention midpoint clamping type single-phase non-isolated photovoltaic inverter topology | |
| CN104682762B (en) | Low-leakage-current grid-connected inverter | |
| CN110149068A (en) | A kind of double Buck full-bridge inverters of aspergillus ficuum three-phase and its control strategy | |
| CN206865369U (en) | Three level multiple-pulses export transformerless inverter circuit | |
| CN203151392U (en) | High-efficiency low-leakage-current inverter topology | |
| CN109347335A (en) | A kind of multi-level inverter bridge arm topology suitable for current source control | |
| CN107404249A (en) | A kind of low-leakage current grid-connected inverter circuit and its control method | |
| CN103269174B (en) | A kind of single-phase photovoltaic grid-connected inverter of low common-mode voltage | |
| CN105553319B (en) | A kind of control method of the non-isolated Buck Boost three-phase photovoltaic inverters of single-stage | |
| CN104734550B (en) | A kind of multi input half-bridge combining inverter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 210000 new model road, Nanjing, Nanjing, Jiangsu Applicant after: Nanjing Post & Telecommunication Univ. Address before: 210023 9 Wen Yuan Road, Qixia District, Nanjing, Jiangsu. Applicant before: Nanjing Post & Telecommunication Univ. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |