CN202495887U - Inverter used in photovoltaic power generation - Google Patents
Inverter used in photovoltaic power generation Download PDFInfo
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- CN202495887U CN202495887U CN2012200426532U CN201220042653U CN202495887U CN 202495887 U CN202495887 U CN 202495887U CN 2012200426532 U CN2012200426532 U CN 2012200426532U CN 201220042653 U CN201220042653 U CN 201220042653U CN 202495887 U CN202495887 U CN 202495887U
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- power switch
- switch pipe
- inverter
- switch transistor
- diode
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
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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
- 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
-
- 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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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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
- H02M7/5388—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 with asymmetrical configuration of switches
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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 utility model discloses an inverter used in photovoltaic power generation. The inverter comprises a DC/DC boost module, a direct-current wave smoothing unit, an inverter circuit module, a control module, and an alternating-current filter inductor. The inverter circuit module comprises a first bridge arm and a second bridge arm which are located between the positive bus-bar and the negative bus-bar, wherein the first bridge arm consists of a second power switch transistor, a third power switch transistor, a fourth power switch transistor and a fifth power switch transistor which are serially connected, the second bridge arm consists of a sixth power switch transistor and a seventh power switch transistor which are serially connected, and a second diode and a third diode which are serially connected and serve as the clamping are located between a connection point of the second power switch transistor and the third power switch transistor and a connection point of the fourth power switch transistor and the fifth power switch transistor. The control module is used to generate pulse control signals for controlling the switch-on and switch-off of the power switch transistors in the bridge arms. The alternating-current filter inductor is used for filtering alternating current, and the alternating-current filter inductor is located between a power grid/a load and a first output port of the inverter circuit module. According to the inverter of the utility model, the common mode current can be effectively reduced without increasing the complexity of the circuit, aging of solar panels is improved, electromagnetic compatibility and security are enhanced, and the conversion efficiency is also improved.
Description
Technical field
The utility model relates to field of solar thermal power generation, is specifically related to a kind of inverter that is used for photovoltaic generation.
Background technology
Having now people sharply increases energy demand, and the fossil energy weary modern society of plaque day by day, regenerative resources such as development and utilization solar energy more and more come into one's own.Solar energy power generating is the important component part of new forms of energy, is considered to new energy technology the most promising on the our times.Existing photovoltaic DC-to-AC converter mainly is divided into two types, isolated form and non-isolation type.Because transformer isolation is arranged, first kind photovoltaic DC-to-AC converter allows photovoltaic panel terminal ground connection.But,, can increase overall volume, weight and the cost of system if adopt Industrial Frequency Transformer to isolate.In order to overcome this problem, produced and used the DC-to-dc converter of being with high frequency transformer, to realize the scheme of electrical isolation as one-level intermediate link.Yet in most applications, significantly reduced volume and weight, and, made main circuit complicated more, increased cost, reduced efficient because of the Two Stages that its topology adopts though should replace the high frequency transformer that selects in the scheme to compare with Industrial Frequency Transformer.Because these restrictions, photovoltaic market has turned one's attention to the photovoltaic DC-to-AC converter of the transformer with any kind of.Application scenario at the middle low power parallel network reverse; Particularly single-phase inverter in order to pursue maximal efficiency and to reduce cost, mostly adopts the transless isolation design; But the sort circuit structure has a shortcoming, promptly exists between output loading end and the photovoltaic array directly to be electrically connected.Owing to there is parasitic capacitance over the ground between solar cell and the grounding shell; This parasitic capacitance and inverter output end impedance form the loop of common mode current circulation; When the power switch of inverter moves, can cause the variation of current potential in this loop, thereby can encourage this common mode loop to produce common mode current.The appearance of common mode current can cause the aging of solar panels, increases the conduction loss of system, reduces Electro Magnetic Compatibility and produces safety problem.
In order to solve the common mode current problem of non-isolation type photovoltaic DC-to-AC converter, commonplace in the prior art is to adopt the bipolarity modulation, yet the bipolarity modulation can cause bigger switching loss harmonic electric current.More existing patents have proposed a lot of new topological structures, strive solving from circuit structure the problem of common mode current.But can increase the complexity of circuit structure mostly, strengthen cost, or cause some other problem.
The utility model content
The utility model purpose provides a kind of inverter that is used for photovoltaic generation, and this inverter can reduce common mode current preferably under the prerequisite that does not increase circuit complexity, improves the aging of solar panels, has strengthened Electro Magnetic Compatibility and fail safe; And conversion efficiency also is improved.
For achieving the above object, the technical scheme that the utility model adopts is: a kind of inverter that is used for photovoltaic generation, and this inverter is between solar energy photovoltaic panel and electrical network/load; Said inverter comprises:
The DC/DC boost module, this DC/DC boost module input is connected to the output of said solar energy photovoltaic panel;
Direct current is put down the ripple unit, and the flat ripple unit of this direct current is between positive bus-bar and negative busbar;
The inverter circuit module; Be used for converting direct current to alternating current; Comprise first brachium pontis and second brachium pontis between positive bus-bar and negative busbar; First brachium pontis serve as reasons the series connection second, third, the 4th and the 5th power switch pipe, second brachium pontis serve as reasons the series connection the 6th, the 7th power switch pipe, the contact of the 3rd, the 4th power switch pipe is as first output port; Six, the contact of the 7th power switch pipe is as second output port, as series connection second diode of clamp and the 3rd diode between the contact of the contact and the 4th of second, third power switch pipe, the 5th power switch pipe;
Control module; Be used for producing first pulse control signal and second pulse control signal that is used for producing the control second brachium pontis power switch pipe break-make of the control first brachium pontis power switch pipe break-make; Said first pulse control signal is a high-frequency pulse signal, and said second pulse control signal is a low frequency pulse signal;
Be used for the ac filter inductance to alternating current filtering, it is between first output port of electrical network/load and said inverter circuit module.
Further improved technical scheme is following in the technique scheme:
1, in the such scheme; Said DC/DC boost module is made up of first inductance, first power switch pipe and first diode; This first inductance, one termination receives the direct current from direct current positive bus; The other end is connected to the collector electrode of said first power switch pipe, and the emitter of first power switch pipe is connected to the direct current negative busbar, and said first diode, one end is connected to the contact of said first inductance and first power switch pipe.
2, in the such scheme, the flat ripple unit of said direct current is made up of serial connection first electric capacity and second electric capacity, and the contact of first electric capacity and second electric capacity is connected with the contact of second diode with the 3rd diode.
Because the technique scheme utilization, the utility model compared with prior art has advantage and effect:
1, the utility model just is to make low frequency according to the modulation wave frequency to switch because of the mid point output current potential of the second brachium pontis B; When adopting single filter inductance, keep in the process of stable state at mid point output current potential, the each point current potential in the common mode current loop also keeps stable over the ground; Can not cause common mode current; The utility model only produce common mode current, thereby the common mode current effective value in whole cycle is very little, so can reduce common mode current preferably under the prerequisite that does not increase circuit complexity in the moment of brachium pontis B mid point output jump in potential; Improve the aging of solar panels, strengthened Electro Magnetic Compatibility and fail safe.
2, than the inverter that transformer is arranged, not only reduced the volume of inverter, reduce the cost of inverter, and had higher conversion efficiency.
3, than the bipolarity modulating mode, the unipolarity pattern that is adopted can reduce output harmonic wave and reduce switching loss; Than other circuit topological structures, this patent greatly reduces common mode current under the prerequisite that does not increase the circuit structure complexity.
Description of drawings
Accompanying drawing 1 is used for the inverter theory diagram of photovoltaic generation for the utility model;
Accompanying drawing 2 is used for the inverter common mode current schematic diagram of photovoltaic generation for the utility model;
Accompanying drawing 3 is the utility model first brachium pontis A output potential waveform figure;
Accompanying drawing 4 is the utility model second brachium pontis B output potential waveform figure;
Accompanying drawing 5 is used for the inverter circuit schematic diagram of photovoltaic generation for the utility model.
In the above accompanying drawing: 1, solar energy photovoltaic panel; 2, electrical network/load; 3, DC/DC boost module; 4, the flat ripple unit of direct current; 5, inverter circuit module; 6, control module; 7, ac filter inductance.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further described:
Embodiment: a kind of inverter that is used for photovoltaic generation, this inverter is between solar energy photovoltaic panel 1 and electrical network/load 2; Said inverter comprises:
DC/DC boost module 3, this DC/DC boost module input is connected to the output of said solar energy photovoltaic panel;
Direct current is put down ripple unit 4, and the flat ripple unit of this direct current is by between positive bus-bar and negative busbar;
Inverter circuit module 5; Be used for converting direct current to alternating current; Comprise first brachium pontis and second brachium pontis between positive bus-bar and negative busbar; First brachium pontis serve as reasons series connection second, third, the 4th and the 5th power switch pipe Q2, Q3, Q4, Q5, second brachium pontis serve as reasons the 6th, the 7th power switch pipe Q6, the Q7 of series connection, the contact of the 3rd, the 4th power switch pipe is as first output port; Six, the contact of the 7th power switch pipe is as second output port, as the series connection second diode D2 of clamp and the 3rd diode D3 between the contact of the contact and the 4th of second, third power switch pipe, the 5th power switch pipe;
Control module 6; Be used for producing first pulse control signal and second pulse control signal that is used for producing the control second brachium pontis power switch pipe break-make of the control first brachium pontis power switch pipe break-make; Said first pulse control signal is a high-frequency pulse signal, and said second pulse control signal is a low frequency pulse signal;
Be used for the ac filter inductance 7 to alternating current filtering, it is between first output port of electrical network/load 2 and said inverter circuit module 5.
Above-mentioned DC/DC boost module is made up of first inductance L 1, the first power switch pipe Q1, the first diode D1; These first inductance L, 1 one terminations receive the direct current from direct current positive bus; The other end is connected to the collector electrode of the said first power switch pipe Q1; The emitter of the first power switch pipe Q1 is connected to the direct current negative busbar, and the said first diode D1, one end is connected to the contact of said first inductance L 1 and the first power switch pipe Q1.
The flat ripple unit 4 of above-mentioned direct current is made up of serial connection first capacitor C 1 and second capacitor C 2, and the contact of first capacitor C 1 and second capacitor C 2 is connected with the contact of the second diode D2 and the 3rd diode D3.
The present embodiment foregoing is explained as follows.
Accompanying drawing 2 is schematic diagrams that the utility model is analyzed about common mode current.
With the negative busbar current potential serves as that the each point current potential is following in the accompanying drawing 2 with reference to ground:
The direct current positive bus current potential is Up, and direct current negative busbar current potential is that 0, the first brachium pontis A mid point output current potential is Ua0, and the second brachium pontis B mid point output current potential is Ub0.At a complete modulating wave in the cycle, the waveform of Ua0, Ub0 such as Fig. 3, (being the potential change of the first brachium pontis A when being two level brachium pontis shown in Fig. 3) shown in Figure 4.The amplitude of Ua0 and Ub0 is all switched between Up and 0 two current potentials.
With U
LPressure drop on the expression inductance, U
gThe expression load terminal voltage, U
CmCommon-mode voltage on the expression parasitic capacitance, Uz representes the voltage drop on the load end earth impedance Z, i
CmCommon mode current in the expression common mode loop.
Solar energy photovoltaic array anode exists parasitic capacitance Cm1 and Cm2 to the earth and negative terminal respectively to the earth, and these two parasitic capacitances all can constitute the common mode current loop, and principle is identical, and the common mode current loop that constitutes with Cm2 below is that example is analyzed.
As shown in Figure 2, parasitic capacitance Cm2, the first brachium pontis A, filter inductance L, output loading, output earth impedance Z can constitute first common mode current loop, and the common mode current in this loop is produced by the jump in potential excitation of brachium pontis A.Parasitic capacitance Cm2, the second brachium pontis B, output earth impedance Z can constitute second common mode current loop, and the common mode current in this loop is produced by the jump in potential excitation of brachium pontis B.
According to Kirchhoff's second law, can list the voltage equation in two common mode current loops respectively:
-U
ao+U
L+U
g+U
Z+U
cm=0（1）
-U
bo+U
Z+U
cm=0（2）
As shown in Figure 2, flow through the common mode current i of ground wire
CmMainly encourage generation, promptly by U by the change in voltage on parasitic capacitance and the load end earth impedance Z
Z+ U
CmExcitation produces.
Get by following formula (2)
U
Z+U
cm=U
bo （3）
So common mode current this moment is only by U
BoExcitation produces, and in fact the jump in potential of brachium pontis A does not motivate common mode current in above-mentioned first common mode current loop, and this is the place different with double smoothing inductance.
As shown in Figure 4, the mid point output current potential of the second brachium pontis B just is to make low frequency according to the modulation wave frequency to switch, at 0～T/2 in the cycle, and U
Z+ U
Cm=U
Bo=U
pAt T/2～T in the cycle, U
Z+ U
Cm=U
Bo=0.At per half modulating wave of correspondence in the cycle, U
Z+ U
CmConstant, can not cause common mode current.Has only the U of working as
BoU in the time of saltus step
Z+ U
CmJust take place once to change, just can cause common mode current this moment.Because this voltage jump only occurs in the T/2 and the T moment; Can come to reduce greatly the common mode current (can not cause the reduction of efficient basically) that is brought when this time switching through the speed of slowing down its state switching; From the whole modulating wave cycle, its common mode current effective value is very little.And if adopt double smoothing inductance, the current potential high frequency saltus step meeting of brachium pontis A seals in this loop through filter inductance, thereby produces the common mode current of high frequency variation in the cycle at whole modulating wave.In sum, adopt single filter inductance, because U
Z+ U
CmDo not have the variation of high frequency, the pace of change when its low frequency switches is again controlled, so can reduce the common mode current that it causes greatly.
With reference to accompanying drawing 5; Direct current input positive bus-bar links to each other with power tube Q1 collector electrode through an inductance L 1; Negative busbar links to each other with the emitter of power tube Q1; Said inductance L 1 is connected with diode D1, and the other end of D1 links to each other with bus capacitor C1, and the series circuit that said bus capacitor C1 and C2 constitute is connected across on the bus; The collector electrode of the emitter Q3 of said power device Q2 links to each other, and the emitter of said Q3 links to each other with the collector electrode of Q4, and the emitter of said Q4 links to each other with the collector electrode of Q5, and the series circuit that said power device is formed is connected across between the positive and negative busbar; The series circuit that the emitter of said power device Q6 and the collector electrode of Q7 are connected to form is connected across between the positive and negative busbar; The mid point of said C3, C4 series connection is through series connection clamping diode D2 and Q2, and the mid point of Q3 series connection links to each other, and links to each other with the mid point of Q4, Q5 series connection through anti-series clamping diode D3 simultaneously; The mid point of said power tube Q3, Q4 links to each other with the end of the said filter inductance L2 that is incorporated into the power networks, and the other end of L2 links to each other with electrical network/load; The mid point of said Q6, Q7 directly links to each other with electrical network/load.The direct current that solar energy photovoltaic panel produces is through after inductance L 1 and power device Q1 and DC/DC booster circuit of diode D1 composition; Pass through direct current flat wave capacitor C1 again; C2 puts down ripple; Inverter circuit through being made up of six power tube Q2, Q3, Q4, Q5, Q6, Q7 and clamping diode D2, D3 converts direct current to alternating current then, through the filter inductance L2 that is incorporated into the power networks alternating current is carried out being connected to the grid after the filtering/load at last.One end of electrical network/load is connected with the earth, ignores its impedance ground.Solar energy photovoltaic array positive and negative terminal parasitic capacitance equivalence over the ground is negative terminal direct-to-ground capacitance Cm.
U
A0, U
B0The expression full-bridge inverter exchanges output a, the b point voltage to 0 of direct current negative busbar, U
LPressure drop on the expression inductance, U
gExpression electrical network/load voltage, U
CmCommon-mode voltage on the expression parasitic capacitance, i
CmCommon mode current in the expression common mode resonance loop.
According to Kirchhoff's second law, can list the voltage equation in common mode current loop:
-U
ao+U
L+U
g+U
cm=0
-U
bo+U
cm=0
Get common-mode voltage U by following formula
CmBe U
Cm=U
B0,
And flow through the common mode current i on the parasitic capacitance
CmFor
It is thus clear that common mode current is directly proportional with the rate of change of common-mode voltage.
At electrical network/load current positive half period, Q7 is conducting always, U
Cm=U
B0=0;
At electrical network/load current negative half-cycle, Q6 is conducting always, U
Cm=U
B0=U
P
Because Q6 and Q7 only carry out the power frequency switch, in per half power frequency period of correspondence, U
CmConstant, can not cause common mode current, and have only U when the state of Q6 and Q7 switches
CmJust take place once to change, just can cause common mode current at the moment.Because per half power frequency period of Q6 and Q7 just switches once, can come to reduce greatly the common mode current (can not cause the reduction of efficient basically) that is brought when this time switching through the speed of slowing down its switching.In sum, U
CmDo not have the variation of high frequency, the pace of change when its power frequency changes is again controlled, so can reduce the common mode current that it causes greatly.
The foregoing description only is the technical conceive and the characteristics of explanation the utility model, and its purpose is to let the personage who is familiar with this technology can understand content of the utility model and enforcement according to this, can not limit the protection range of the utility model with this.All equivalences of being done according to the utility model spirit change or modify, and all should be encompassed within the protection range of the utility model.
Claims (3)
1. inverter that is used for photovoltaic generation, this inverter is positioned between solar energy photovoltaic panel (1) and the electrical network/load (2); It is characterized in that: said inverter comprises:
DC/DC boost module (3), this DC/DC boost module input is connected to the output of said solar energy photovoltaic panel;
Direct current is put down ripple unit (4), and the flat ripple unit of this direct current is between positive bus-bar and negative busbar;
Inverter circuit module (5); Be used for converting direct current to alternating current; Comprise first brachium pontis and second brachium pontis between positive bus-bar and negative busbar; First brachium pontis serve as reasons the series connection second, third, the 4th and the 5th power switch pipe (Q2, Q3, Q4, Q5); The the 6th, the 7th power switch pipe (Q6, Q7) that second brachium pontis is served as reasons and connected; Three, the contact of the 4th power switch pipe is as first output port, and the contact of the 6th, the 7th power switch pipe is as second output port, as series connection second diode (D2) of clamp and the 3rd diode (D3) between the contact of the contact and the 4th of second, third power switch pipe, the 5th power switch pipe;
Control module (6); Be used for producing first pulse control signal and second pulse control signal that is used for producing the control second brachium pontis power switch pipe break-make of the control first brachium pontis power switch pipe break-make; Said first pulse control signal is a high-frequency pulse signal, and said second pulse control signal is a low frequency pulse signal;
Be used for the ac filter inductance (7) to alternating current filtering, it is positioned between first output port of electrical network/load (2) and said inverter circuit module (5).
2. the inverter that is used for photovoltaic generation according to claim 1; It is characterized in that: said DC/DC boost module is made up of first inductance (L1), first power switch pipe (Q1) and first diode (D1); This first inductance (L1) termination receives the direct current from direct current positive bus; The other end is connected to the collector electrode of said first power switch pipe (Q1); The emitter of first power switch pipe (Q1) is connected to the direct current negative busbar, and said first diode (D1) end is connected to the contact of said first inductance (L1) and first power switch pipe (Q1).
3. the inverter that is used for photovoltaic generation according to claim 1; It is characterized in that: the flat ripple unit (4) of said direct current is made up of serial connection first electric capacity (C1) and second electric capacity (C2), and the contact of first electric capacity (C1) and second electric capacity (C2) is connected with the contact of second diode (D2) with the 3rd diode (D3).
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| CN2012200426532U CN202495887U (en) | 2012-02-10 | 2012-02-10 | Inverter used in photovoltaic power generation |
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| WO2016091299A1 (en) * | 2014-12-10 | 2016-06-16 | Siemens Aktiengesellschaft | Highly efficient power converter for single-phase systems |
| CN107959433A (en) * | 2017-12-21 | 2018-04-24 | 阳光电源股份有限公司 | A kind of inverter and inversion system for suppressing leakage current |
| CN109120173A (en) * | 2017-06-22 | 2019-01-01 | 丰郅(上海)新能源科技有限公司 | Multi-level converter topology structure |
| CN109120171A (en) * | 2017-06-22 | 2019-01-01 | 丰郅(上海)新能源科技有限公司 | The multi-level inverse conversion system of industrial-frequency alternating current is generated by high frequency switching switch control |
| CN109120172A (en) * | 2017-06-22 | 2019-01-01 | 丰郅(上海)新能源科技有限公司 | The method by pulsating volage linking at alternating current is realized in multi-level inverse conversion system |
| CN110726949A (en) * | 2019-10-30 | 2020-01-24 | 上能电气股份有限公司 | Aging test circuit and method for string type photovoltaic inverter |
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2012
- 2012-02-10 CN CN2012200426532U patent/CN202495887U/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016091299A1 (en) * | 2014-12-10 | 2016-06-16 | Siemens Aktiengesellschaft | Highly efficient power converter for single-phase systems |
| CN109120173A (en) * | 2017-06-22 | 2019-01-01 | 丰郅(上海)新能源科技有限公司 | Multi-level converter topology structure |
| CN109120171A (en) * | 2017-06-22 | 2019-01-01 | 丰郅(上海)新能源科技有限公司 | The multi-level inverse conversion system of industrial-frequency alternating current is generated by high frequency switching switch control |
| CN109120172A (en) * | 2017-06-22 | 2019-01-01 | 丰郅(上海)新能源科技有限公司 | The method by pulsating volage linking at alternating current is realized in multi-level inverse conversion system |
| CN109120173B (en) * | 2017-06-22 | 2021-07-02 | 丰郅(上海)新能源科技有限公司 | Multilevel inverter topology structure |
| CN109120172B (en) * | 2017-06-22 | 2021-07-02 | 丰郅(上海)新能源科技有限公司 | Method for connecting pulsating voltage into alternating current in multi-level inverter system |
| CN109120171B (en) * | 2017-06-22 | 2021-10-29 | 丰郅(上海)新能源科技有限公司 | Multi-level inverter system for generating power frequency alternating current under control of high-frequency switch |
| CN107959433A (en) * | 2017-12-21 | 2018-04-24 | 阳光电源股份有限公司 | A kind of inverter and inversion system for suppressing leakage current |
| CN107959433B (en) * | 2017-12-21 | 2020-08-28 | 阳光电源股份有限公司 | Inverter and inversion system for inhibiting leakage current |
| CN110726949A (en) * | 2019-10-30 | 2020-01-24 | 上能电气股份有限公司 | Aging test circuit and method for string type photovoltaic inverter |
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