CN102412748A - Grid-connected inverter and control method thereof - Google Patents

Grid-connected inverter and control method thereof Download PDF

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Publication number
CN102412748A
CN102412748A CN201110363352XA CN201110363352A CN102412748A CN 102412748 A CN102412748 A CN 102412748A CN 201110363352X A CN201110363352X A CN 201110363352XA CN 201110363352 A CN201110363352 A CN 201110363352A CN 102412748 A CN102412748 A CN 102412748A
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switch
diode
bus
grid
switching
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CN102412748B (en
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郭小强
赵清林
杨秋霞
邬伟扬
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HUAXIA TIANXIN INTELLIGENT INTERNET OF THINGS Co.,Ltd.
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Yanshan University
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    • 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

Abstract

The invention discloses a grid-connected inverter and a control method thereof. Key points of the technical scheme are that: the grid-connected inverter consists of six switch tubes, two diodes and two inductors, wherein four of the six switches are in the working frequency mode, the other two switches are in the high frequency mode, and only one switch is in the high frequency mode at moment, so that the switching loss is effectively lowered. In the circuit, a bridge arm is allowed to be connected directly, so that overcurrent is avoided, and high reliability is achieved. In the entire working period, voltages at the two ends of a grounding parasitic capacitor of a photovoltaic system do not contain any high-frequency component, so that the drain current is effectively restrained.

Description

A kind of photovoltaic combining inverter and control method thereof
Technical field
The invention belongs to a kind of photovoltaic combining inverter and control method thereof.
Background technology
Solar energy has great development and use potentiality as a kind of aboundresources, the regenerative resource widely that distributes.Photovoltaic power generation technology is to realize one of important channel that solar energy effectively utilizes.The non-isolation type photovoltaic generating system has removed the power frequency isolating transformer, and it is little to have a volume, cost low with the high characteristics of efficient, have very big market potentiality and competitiveness.But owing to have parasitic capacitance between non-isolation type photovoltaic generating system and the earth, the action of photovoltaic combining inverter HF switch possibly cause bigger leakage current, thereby causes grid-connected current distortion, electromagnetic interference, even also possibly constitute a threat to personal safety.Therefore, it is significant that research and development have the photovoltaic combining inverter of drain current suppressing ability.
Adopt the single-phase full bridge photovoltaic combining inverter of unipolarity modulation to have characteristics such as output voltage ripple is little, efficient height, but there is big leakage current in this scheme.The scheme of present solution leakage current mainly contains: DC side earthing, dc bypass method and exchange the method for bypass etc.
The DC side earthing: this method generally adopts half-bridge circuit, with two electric capacity neutral earthings of DC side, make photovoltaic system over the ground the parasitic capacitance voltage maintain 1/2 of dc voltage, thereby reach the purpose that suppresses leakage current.But this scheme requires dc voltage higher, generally is 2 times of full-bridge circuit, needs higher withstand voltage switching device, has increased system cost.
The dc bypass method with exchange the method for bypass: the core concept of these class methods is on the basis of single-phase full bridge circuit, to improve, and through adding auxiliary switch when realizing the unipolarity modulation, keeps system's common-mode voltage constant, thereby reaches the purpose that suppresses leakage current.United States Patent (USP) 7046534 proposes to add auxiliary switch in single-phase full bridge circuit AC side and constitutes continuous current circuit, when realizing the unipolarity modulation, guarantees that common-mode voltage is constant.United States Patent (USP) 2005/0286281 proposes to introduce auxiliary switch in DC side, when realizing the unipolarity modulation, guarantees that common-mode voltage is constant.Yet there are two subject matters in this type of based on the improved topology of full-bridge circuit: the first, and during foregoing circuit work, have at least 2 or 2 above switches to work in high frequency mode, make switching loss bigger.The second, because the foregoing circuit structure comes from full-bridge circuit, therefore same brachium pontis can not lead directly to, otherwise overcurrent can occur.And in the practical application because circuit outside or internal interference, might cause the misoperation of same brachium pontis switch drive to cause that bridge arm direct pass produces overcurrent, influences system reliability.
Summary of the invention
In order to solve the problem of above-mentioned existence, the object of the present invention is to provide a kind of photovoltaic combining inverter and control method thereof that can effectively suppress leakage current.
To achieve the above object, the present invention adopts the following technical solution: A photovoltaic inverter, the DC bus, six switches, two diodes and two inductors, DC link "? " ends with switch
Figure 117114DEST_PATH_IMAGE002
The Collector and switches
Figure 147387DEST_PATH_IMAGE003
is connected to the collector switch emitter of the switching
Figure 759383DEST_PATH_IMAGE004
connected to the collector switch
Figure 952467DEST_PATH_IMAGE003
emitter of the switching
Figure 904374DEST_PATH_IMAGE005
connected to the collector of the DC bus"
Figure 222223DEST_PATH_IMAGE006
"ends with switch
Figure 799835DEST_PATH_IMAGE004
emitter and switching emitter connection, switch The collector switch
Figure 775378DEST_PATH_IMAGE007
emitter connected to the switch
Figure 641834DEST_PATH_IMAGE007
The collector diode
Figure 543931DEST_PATH_IMAGE008
cathode connected diodes
Figure 24591DEST_PATH_IMAGE008
anode and grid "
Figure 392731DEST_PATH_IMAGE001
"connected, inductive
Figure 46566DEST_PATH_IMAGE009
in parallel with
Figure 6432DEST_PATH_IMAGE007
emitter and diode
Figure 471042DEST_PATH_IMAGE008
between the anode of the switch
Figure 313096DEST_PATH_IMAGE005
The collector switch
Figure 708306DEST_PATH_IMAGE010
emitter connected to the switch
Figure 335727DEST_PATH_IMAGE010
The collector diode
Figure 158190DEST_PATH_IMAGE011
cathode connected diodes
Figure 487540DEST_PATH_IMAGE011
The anode and grid "
Figure 499489DEST_PATH_IMAGE006
"connected, inductive in parallel with
Figure 224049DEST_PATH_IMAGE010
emitter and diode
Figure 794357DEST_PATH_IMAGE011
The anode.
Another program of the present invention provides a kind of control method of photovoltaic combining inverter, and it comprises the following steps:
And net current in the positive half cycle, switch
Figure 796948DEST_PATH_IMAGE010
and switching
Figure 382650DEST_PATH_IMAGE005
has been turned on, the switch
Figure 359965DEST_PATH_IMAGE004
, switch
Figure 663907DEST_PATH_IMAGE003
and switching
Figure 204610DEST_PATH_IMAGE007
has been turned off, the switch
Figure 395551DEST_PATH_IMAGE002
using SPWM modulation control the conduction or off; when the switch
Figure 58613DEST_PATH_IMAGE002
is turned on, and net current path is: DC bus "
Figure 521956DEST_PATH_IMAGE001
" side → switch
Figure 679399DEST_PATH_IMAGE002
→ inductance
Figure 974114DEST_PATH_IMAGE009
→ Grid → diode
Figure 745761DEST_PATH_IMAGE011
→ Switch
Figure 506519DEST_PATH_IMAGE010
→ Switch
Figure 389024DEST_PATH_IMAGE005
→ DC bus " "end → DC bus"
Figure 559423DEST_PATH_IMAGE001
"end; when the switch
Figure 997357DEST_PATH_IMAGE002
off, and net current path is: node" b "→ switch Anti- parallel diode → inductance
Figure 828227DEST_PATH_IMAGE009
? → Grid → diode
Figure 754726DEST_PATH_IMAGE011
? → Switch → Switch
Figure 966581DEST_PATH_IMAGE005
→ node" b ";
And net current negative half cycle, switch
Figure 293657DEST_PATH_IMAGE003
and switching
Figure 140127DEST_PATH_IMAGE007
has been turned on, the switch
Figure 614971DEST_PATH_IMAGE002
, switch
Figure 642969DEST_PATH_IMAGE005
and switching
Figure 637601DEST_PATH_IMAGE010
has been turned off, the switch
Figure 155170DEST_PATH_IMAGE004
using SPWM modulation control the conduction or off; when the switch is turned on, and net current path is: DC bus "
Figure 168574DEST_PATH_IMAGE001
"side → switch
Figure 532559DEST_PATH_IMAGE003
→ inductance
Figure 158713DEST_PATH_IMAGE012
? → Grid → diode
Figure 93302DEST_PATH_IMAGE008
? → Switch
Figure 525420DEST_PATH_IMAGE007
? → Switch → DC bus"
Figure 288769DEST_PATH_IMAGE006
"end → DC bus"
Figure 959922DEST_PATH_IMAGE001
"end; when the switch
Figure 867835DEST_PATH_IMAGE003
off, and net current path is: node "b" → switch
Figure 691566DEST_PATH_IMAGE005
anti-parallel diode → inductance
Figure 659522DEST_PATH_IMAGE012
? → Grid → diode
Figure 817971DEST_PATH_IMAGE008
? → Switch
Figure 342624DEST_PATH_IMAGE007
→ Switch
Figure 207812DEST_PATH_IMAGE004
→ node "b".
As a result of the technical proposal, compared with the prior art, the present invention has the advantages that:
Figure 408986DEST_PATH_IMAGE013
? 6 switches, the four switches in the frequency mode, two switches in the high frequency mode and at any time only one switch in the high frequency mode, greatly reducing the switching losses, high system efficiency;
Figure 805463DEST_PATH_IMAGE014
? The grid inverter output voltage three-level (similar to the single-phase full-bridge unipolar modulation), which can effectively reduce the inductance volume and size, reduce the inductance current ripple.
Figure 320758DEST_PATH_IMAGE015
? to overcome the traditional single-phase full-bridge circuit bridge arm straight over current problem exists, the circuit allows the bridge arm straight and will not appear over-current and high reliability.
Figure 102770DEST_PATH_IMAGE016
? The topology and control method can effectively reduce the leakage current.
Description of drawings
Fig. 1 is the circuit theory diagrams of photovoltaic combining inverter of the present invention;
Fig. 2 is a photovoltaic combining inverter switch control logic of the present invention;
Fig. 3 is a mode of operation 1 of the present invention;
Fig. 4 is a mode of operation 2 of the present invention;
Fig. 5 is a mode of operation 3 of the present invention;
Fig. 6 is a mode of operation 4 of the present invention.
Embodiment
Do further bright in detail specifically below in conjunction with the accompanying drawing specific embodiments of the invention.
In Figure 1, the present invention photovoltaic inverter consists of six switches, two diodes and two inductors, DC link "
Figure 412528DEST_PATH_IMAGE001
" ends with switch
Figure 299231DEST_PATH_IMAGE002
collector and switches
Figure 414955DEST_PATH_IMAGE003
connected to the collector switch
Figure 254735DEST_PATH_IMAGE002
The emitter switch
Figure 548444DEST_PATH_IMAGE004
is connected to the collector switch
Figure 168781DEST_PATH_IMAGE003
emitter of the switching
Figure 760300DEST_PATH_IMAGE005
connected to the collector of the DC bus " "ends with switch
Figure 247093DEST_PATH_IMAGE004
emitter and switching
Figure 26830DEST_PATH_IMAGE005
emitter connected to the switch
Figure 235089DEST_PATH_IMAGE004
The collector switch emitter connection, switch
Figure 934240DEST_PATH_IMAGE007
The collector diode
Figure 11393DEST_PATH_IMAGE008
is connected to the cathode, the diode
Figure 210293DEST_PATH_IMAGE008
anode and grid "
Figure 941489DEST_PATH_IMAGE001
"connected, inductive
Figure 747902DEST_PATH_IMAGE009
in parallel with
Figure 502231DEST_PATH_IMAGE007
emitter and diode between the anode of the switch
Figure 700312DEST_PATH_IMAGE005
The collector switch
Figure 130156DEST_PATH_IMAGE010
emitter connected to the switch
Figure 184831DEST_PATH_IMAGE010
The collector Diode
Figure 522271DEST_PATH_IMAGE011
cathode connected diodes
Figure 970002DEST_PATH_IMAGE011
The anode and grid "
Figure 305169DEST_PATH_IMAGE006
"connected, inductive
Figure 96407DEST_PATH_IMAGE012
in parallel with
Figure 988271DEST_PATH_IMAGE010
emitter and diode
Figure 548565DEST_PATH_IMAGE011
The anode.Through suitable control, guarantee grid-connected current and line voltage with the frequency homophase, the realization unity power factor is incorporated into the power networks.
Figure 133262DEST_PATH_IMAGE017
between the PV and ground parasitic capacitance, the capacitance of the external environmental conditions, photovoltaic panels size of the structure and other factors, usually in about 50 ~ 150nF/kW.
In Figure 2, when the invention of photovoltaic grid-connected inverter and net current work in the positive half cycle, switch
Figure DEST_PATH_771105DEST_PATH_IMAGE010
and switching
Figure DEST_PATH_952688DEST_PATH_IMAGE005
has been turned on, the switch
Figure DEST_PATH_345623DEST_PATH_IMAGE004
, switch
Figure DEST_PATH_183129DEST_PATH_IMAGE003
and switching
Figure DEST_PATH_749239DEST_PATH_IMAGE007
has been shutdown.Switch
Figure DEST_PATH_723012DEST_PATH_IMAGE002
using SPWM modulation control the conduction or off.In Figure 3, when the switch
Figure DEST_PATH_286848DEST_PATH_IMAGE002
is turned on, the parasitic capacitance of the PV system
Figure DEST_PATH_673967DEST_PATH_IMAGE013
0 the voltage across; in Figure 4, when the switch shutdown, the parasitic capacitance of the PV system voltage across remains at 0; and net current negative half cycle , the switch
Figure DEST_PATH_606785DEST_PATH_IMAGE003
and switching has been turned on, the switch
Figure DEST_PATH_320937DEST_PATH_IMAGE002
, switch
Figure DEST_PATH_269302DEST_PATH_IMAGE005
and switching
Figure DEST_PATH_174941DEST_PATH_IMAGE010
has been shutdown.Switch
Figure DEST_PATH_271073DEST_PATH_IMAGE004
using SPWM modulation control the conduction or off.In Figure 5, when the switch
Figure DEST_PATH_654781DEST_PATH_IMAGE004
is turned on, the parasitic capacitance of the PV system
Figure DEST_PATH_785548DEST_PATH_IMAGE013
voltage across the grid voltage, the instantaneous value of the sinusoidally with time changes slowly (50Hz); in Figure 6, when the switch
Figure DEST_PATH_862088DEST_PATH_IMAGE004
shutdown, parasitic PV systems capacitance
Figure DEST_PATH_383199DEST_PATH_IMAGE013
voltage remains across the grid voltage, the following table shows the four working modes of the switch state and the corresponding capacitance
Figure DEST_PATH_632915DEST_PATH_IMAGE013
voltage across.Where,
Figure DEST_PATH_555872DEST_PATH_IMAGE014
,
Figure DEST_PATH_865630DEST_PATH_IMAGE015
and
Figure DEST_PATH_874038DEST_PATH_IMAGE016
respectively, the grid voltage amplitude, phase and frequency, ON represents switch conduction, OFF represents the switching off.
Figure DEST_PATH_865127DEST_PATH_IMAGE017
According to the table above, the parasitic capacitance
Figure 246547DEST_PATH_IMAGE017
voltage across the upper half cycle is 0, later this week showed a frequency of 50Hz variations, the entire work cycle, the parasitic capacitance no voltage across the high-frequency component.Because the system leakage current is
Figure 97621DEST_PATH_IMAGE022
, based on the above analysis of the topology and its modulation scheme can effectively reduce the leakage current.

Claims (2)

1 A photovoltaic inverter, the DC bus, six switches, two diodes and two inductors, wherein: the DC bus "? ?
Figure 55264DEST_PATH_IMAGE001
"ends with switch
Figure 579917DEST_PATH_IMAGE002
collector and switches
Figure 445105DEST_PATH_IMAGE003
connected to the collector switch
Figure 646279DEST_PATH_IMAGE002
emitter of the switching
Figure 229707DEST_PATH_IMAGE004
connected to the collector switch emitter of the switching
Figure 340063DEST_PATH_IMAGE005
is connected to the collector of the DC bus "
Figure 649821DEST_PATH_IMAGE006
"ends with switch
Figure 524806DEST_PATH_IMAGE004
emitter and switching
Figure 640529DEST_PATH_IMAGE005
emitter connected to the switch
Figure 480309DEST_PATH_IMAGE004
The Collector with switch emitter connected to the switch
Figure 128777DEST_PATH_IMAGE007
The collector diode
Figure 985874DEST_PATH_IMAGE008
cathode connected diodes
Figure 493210DEST_PATH_IMAGE008
anode and grid" " side connection, inductive
Figure 252405DEST_PATH_IMAGE009
in parallel with
Figure 460663DEST_PATH_IMAGE007
emitter and diode
Figure 71773DEST_PATH_IMAGE008
between the anode of the switch
Figure 159815DEST_PATH_IMAGE005
The collector switch
Figure 236968DEST_PATH_IMAGE010
emitter connections, switch The collector of the diode
Figure 901484DEST_PATH_IMAGE011
cathode connected diodes
Figure 973477DEST_PATH_IMAGE011
The anode and grid " "connected, inductive Parallel In the
Figure 863569DEST_PATH_IMAGE010
The emitter and diode
Figure 355730DEST_PATH_IMAGE011
The anode.
2. control method based on the said photovoltaic combining inverter of claim 1, it is characterized in that: it comprises the following steps:
And net current in the positive half cycle, switch and switching
Figure 685529DEST_PATH_IMAGE005
has been turned on, the switch
Figure 391317DEST_PATH_IMAGE004
, switch
Figure 726483DEST_PATH_IMAGE003
and switching
Figure 271384DEST_PATH_IMAGE007
has been turned off, switch
Figure 412515DEST_PATH_IMAGE002
using SPWM modulation control the conduction or off; when switch
Figure 910492DEST_PATH_IMAGE002
is turned on, and net current path is: DC bus "
Figure 229609DEST_PATH_IMAGE001
" end → switch
Figure 508144DEST_PATH_IMAGE002
→ inductance
Figure 203699DEST_PATH_IMAGE009
? → Grid → diode
Figure 618499DEST_PATH_IMAGE011
? → Switch
Figure 374097DEST_PATH_IMAGE010
→ Switch
Figure 874348DEST_PATH_IMAGE005
→ DC bus " " DC bus terminal → "
Figure 577655DEST_PATH_IMAGE001
" side; when the switch
Figure 487842DEST_PATH_IMAGE002
off, and net current path is: node" b "→ switch
Figure 413073DEST_PATH_IMAGE004
anti-parallel diode → inductance
Figure 450430DEST_PATH_IMAGE009
? → Grid → Diode
Figure 839823DEST_PATH_IMAGE011
? → Switch
Figure 124174DEST_PATH_IMAGE010
→ Switch
Figure 412067DEST_PATH_IMAGE005
→ node "b";
And net current negative half cycle, switch and switching has been turned on, the switch
Figure 686687DEST_PATH_IMAGE002
, switch
Figure 226708DEST_PATH_IMAGE005
and switching
Figure 855135DEST_PATH_IMAGE010
has been turned off, the switch
Figure 704274DEST_PATH_IMAGE004
using SPWM modulation control the conduction or off; when the switch
Figure 330427DEST_PATH_IMAGE003
is turned on, and net current path is: DC bus "
Figure 592912DEST_PATH_IMAGE001
" end → switch
Figure 759452DEST_PATH_IMAGE003
→ inductance
Figure 728676DEST_PATH_IMAGE012
? → Grid → diode
Figure 525730DEST_PATH_IMAGE008
? → Switch
Figure 196883DEST_PATH_IMAGE007
? → Switch
Figure 180495DEST_PATH_IMAGE004
→ DC bus " " DC bus terminal → " " side; when the switch
Figure 130631DEST_PATH_IMAGE003
off, and net current path is: node" b "→ switch
Figure 576656DEST_PATH_IMAGE005
anti-parallel diode → inductance
Figure 769740DEST_PATH_IMAGE012
? → Grid → Diode
Figure 721646DEST_PATH_IMAGE008
→ Switch
Figure 305074DEST_PATH_IMAGE007
→ Switch → node "b";
And net current positive half cycle, switch
Figure 602380DEST_PATH_IMAGE005
and switching
Figure 725188DEST_PATH_IMAGE010
has been turned on, the switch
Figure 858229DEST_PATH_IMAGE004
, switch
Figure 911636DEST_PATH_IMAGE003
and switching
Figure 567395DEST_PATH_IMAGE007
has been shutdown; switch
Figure 110372DEST_PATH_IMAGE002
is turned on, and net current path is: DC bus " "end → switch → inductance
Figure 767246DEST_PATH_IMAGE009
? → Grid → diode
Figure 481125DEST_PATH_IMAGE011
? → switch
Figure 339490DEST_PATH_IMAGE010
→ Switch
Figure 797016DEST_PATH_IMAGE005
→ DC bus "
Figure 158859DEST_PATH_IMAGE006
"end → DC bus" "end; switch
Figure 576251DEST_PATH_IMAGE002
shutdown, and network current path is: node "b" → switch
Figure 509572DEST_PATH_IMAGE004
anti-parallel diode → inductance
Figure 988570DEST_PATH_IMAGE009
? → Grid → diode
Figure 309830DEST_PATH_IMAGE011
? → Switch → Switch → node "b";
And net current negative half cycle, switch
Figure 137606DEST_PATH_IMAGE004
and switching
Figure 364188DEST_PATH_IMAGE007
has been turned on, the switch
Figure 418862DEST_PATH_IMAGE002
, switch and switching has been shutdown; switch
Figure 519DEST_PATH_IMAGE003
is turned on, and net current path is: DC bus " "end → switch
Figure 683622DEST_PATH_IMAGE003
→ inductance
Figure 985859DEST_PATH_IMAGE012
? → Grid → diode
Figure 491927DEST_PATH_IMAGE008
→ Switch ? → Switch
Figure 466016DEST_PATH_IMAGE004
→ DC bus "
Figure 818500DEST_PATH_IMAGE006
"end → DC bus"
Figure 557786DEST_PATH_IMAGE001
"end; switch
Figure 995721DEST_PATH_IMAGE003
shutdown, and network current path is: node "b" → switch
Figure 494966DEST_PATH_IMAGE005
anti-parallel diode → inductance ? → Grid → diode
Figure 877723DEST_PATH_IMAGE008
? → Switch
Figure 616003DEST_PATH_IMAGE007
→ Switch → node "b".
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103269174A (en) * 2012-12-10 2013-08-28 江西南昌供电公司 Single-phase photovoltaic grid-connected inverter with low common-mode voltage
CN106921175A (en) * 2017-03-24 2017-07-04 燕山大学 A kind of single-phase non-isolated current source photovoltaic combining inverter and control method
CN111510008A (en) * 2020-05-20 2020-08-07 上海海事大学 Photovoltaic inverter and control method thereof

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CN101707442A (en) * 2009-11-16 2010-05-12 浙江大学 Transformer-free inverter
CN102158110A (en) * 2011-04-07 2011-08-17 江苏斯达工业科技有限公司 Main circuit of non-isolated photovoltaic grid inverter and control realizing method thereof

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US20080101101A1 (en) * 2005-02-25 2008-05-01 Mitsubishi Electric Corporation Power Conversion Apparatus
CN101707442A (en) * 2009-11-16 2010-05-12 浙江大学 Transformer-free inverter
CN102158110A (en) * 2011-04-07 2011-08-17 江苏斯达工业科技有限公司 Main circuit of non-isolated photovoltaic grid inverter and control realizing method thereof

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103269174A (en) * 2012-12-10 2013-08-28 江西南昌供电公司 Single-phase photovoltaic grid-connected inverter with low common-mode voltage
CN103269174B (en) * 2012-12-10 2016-12-21 国网江西省电力公司南昌供电分公司 A kind of single-phase photovoltaic grid-connected inverter of low common-mode voltage
CN106921175A (en) * 2017-03-24 2017-07-04 燕山大学 A kind of single-phase non-isolated current source photovoltaic combining inverter and control method
CN106921175B (en) * 2017-03-24 2020-01-07 燕山大学 Single-phase non-isolated current source photovoltaic grid-connected inverter and control method
CN111510008A (en) * 2020-05-20 2020-08-07 上海海事大学 Photovoltaic inverter and control method thereof
CN111510008B (en) * 2020-05-20 2021-06-25 上海海事大学 Photovoltaic inverter and control method thereof

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