CN104467506B - A kind of efficient H bridge photovoltaic DC-to-AC converter based on electric current and voltage Check up polarity - Google Patents
A kind of efficient H bridge photovoltaic DC-to-AC converter based on electric current and voltage Check up polarity Download PDFInfo
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- CN104467506B CN104467506B CN201410766072.7A CN201410766072A CN104467506B CN 104467506 B CN104467506 B CN 104467506B CN 201410766072 A CN201410766072 A CN 201410766072A CN 104467506 B CN104467506 B CN 104467506B
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Classifications
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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
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- H02J3/383—
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- 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 kind of efficient H bridge photovoltaic DC-to-AC converter based on electric current and voltage Check up polarity, structure is that DC bus capacitor is connected in parallel on photovoltaic battery panel two ends, photovoltaic battery panel connects H bridge inverter, two mid points of H bridge inverter to be connected respectively a newly-increased circuit, newly-increased circuit comprises diode and the switching tube of series connection, a diode is connected with between the emitter of each switching tube and collector electrode, the tie point place of H bridge inverter and newly-increased circuit stretches out four respectively and goes between, article four, lead-in wire does not belong to the same branch road of H bridge inverter and inconsistent being connected in position, AC two ends are connected respectively by an AC filter inductance.Photovoltaic panel and electrical network can be isolated by this topology under freewheeling state, and under power mode, electric current only flows through two switching tubes, and conduction loss is little, and efficiency is high, keep common-mode voltage value to be constant in whole grid cycle, thus suppress the size of common mode leakage current.
Description
Technical field
The present invention relates to a kind of efficient H bridge photovoltaic DC-to-AC converter based on electric current and voltage Check up polarity.
Background technology
In recent years, along with the continuous consumption of fossil fuel in world wide, energy-intensive problem is day by day serious, and therefore, the research of regenerative resource is subject to countries in the world and more and more pays close attention to.Solar photovoltaic technology is a key areas of regenerative resource application, and photovoltaic DC-to-AC converter is the key component of grid-connected photovoltaic power generation system, and its Main Function is that the direct current sent by photovoltaic battery panel converts the alternating current with synchronized to.Photovoltaic combining inverter traditional in solar photovoltaic grid-connection system generally understands erector's frequency power transformer at output, to realize the adjustment to voltage and the isolation to electrical network, but Industrial Frequency Transformer volume is large, cost is high, loss is large, be unfavorable for the improvement of inverter whole efficiency, the research therefore for the non-isolated photovoltaic grid-connected inverter of no industrial frequency transformer becomes focus.In non-isolation type photovoltaic grid-connected inverting system; owing to there is no electrical isolation between inverter and electrical network, under the effect of inverter HF switch, common mode current can be produced; common mode current flows through the common mode loop of system, can produce common mode leakage current in the parasitic capacitance over the ground of photovoltaic panel.
The model of common-mode voltage and common mode current in traditional single phase H full-bridge inverter.Be illustrated in figure 1 the structure chart of conventional non-isolated type single-phase photovoltaic grid-connected system.In FIG, four switch motions of H4 circuit are under high frequency state, a common-mode voltage Ucm can be excited in power frequency period, because photovoltaic battery panel exists a stray capacitance Cpv over the ground, therefore common-mode voltage can produce the common mode leakage current Icm flowing through stray capacitance, the earth and circuit part in circuit.The resonant tank of common mode current represents with dotted line and arrow in FIG.Common-mode voltage formula is:
U
cm-AB＝(U
AO+U
BO)/2
The formula of common mode current can be expressed as:
I
cm＝C
pdU
cm/dt
The common mode leakage current that non-isolation type photovoltaic inverting system produces can work the mischief to personal safety time serious, especially in traditional single-phase full-bridge inverter, if adopt unipolarity switch modulation strategy, common-mode voltage then can be made to produce larger fluctuation, and then bring serious common mode leakage problem.
Summary of the invention
The present invention is in order to solve the problem, propose a kind of efficient H bridge photovoltaic DC-to-AC converter based on electric current and voltage Check up polarity, the circuit structure of this single-phase inverter comprises six switching tubes and two diodes, the common-mode voltage of guarantee system keeps constant in the process of switch motion, thus the size of common mode leakage current is inhibited, simultaneously under freewheeling state circuit topological structure can by photovoltaic module and electrical network isolation, avoid Power Exchange, thus improve efficiency, a kind of combination switch modulation system based on electric current and voltage Check up polarity is proposed simultaneously, the distortion that the output current can eliminating inverter runs because of non-unity power factor or is subject to grid fluctuations affect and occurs.
To achieve these goals, the present invention adopts following technical scheme:
Based on an efficient H bridge photovoltaic DC-to-AC converter for electric current and voltage Check up polarity, comprise photovoltaic battery panel, DC bus capacitor, AC filter inductance, H bridge inverter, 2 switching tubes and 2 diodes, wherein:
DC bus capacitor is connected in parallel on photovoltaic battery panel two ends, photovoltaic battery panel connects H bridge inverter, two mid points of H bridge inverter to be connected respectively a newly-increased circuit, described newly-increased circuit, for photovoltaic battery panel and electrical network being isolated under the freewheeling mode of no-voltage, and in zero voltage state for electric current provides freewheeling path, ensure that system common-mode voltage remains that the half of direct voltage is constant in the course of action of HF switch, to suppress the size of common mode leakage current;
The tie point place of H bridge inverter and newly-increased circuit stretches out four respectively and goes between, article four, lead-in wire does not belong to the same branch road of H bridge inverter and inconsistent being interconnected in position, form two branch roads, two branch roads connect AC two ends respectively by an AC filter inductance.
As shown in Figure 2, left brachium pontis is followed successively by S1, S5, D1, S2 from top to bottom, and right brachium pontis is followed successively by S3, S6, D2, S4 from top to bottom, and wherein switching tube is upper end is collector electrode, and lower end is emitter, and it is that just lower end is negative that diode is upper end.Output point A point and B point lay respectively between D1, S2 and D2, S4.
Described newly-increased circuit structure is identical, comprise diode and the switching tube of series connection respectively, the current collection very positive input of switching tube, between the collector electrode of each switching tube and emitter, Opposite direction connection has a diode, a diode and the emitter forward of switching tube is connected.
As shown in Figure 7, left brachium pontis is followed successively by S1, S5, D1, S2 from top to bottom, and right brachium pontis is followed successively by S3, S6, D2, S4 from top to bottom, and wherein switching tube is upper end is collector electrode, and lower end is emitter, and it is that just lower end is negative that diode is upper end.Output point A point and B point lay respectively between S1, S5 and S3, S6.
Described newly-increased circuit structure is identical, comprise diode and the switching tube of series connection respectively, the transmitting very positive input of switching tube, between the emitter of each switching tube and collector electrode, forward is connected with a diode, and emitter differential concatenation diode of switching tube.
As shown in Figure 8, left brachium pontis is followed successively by S1, D1, S5, S2 from top to bottom, right brachium pontis is followed successively by S3, D2, S6, S4 from top to bottom, wherein switching tube S1, S2, S3, S4 is upper end is collector electrode, lower end is emitter, and it is collector electrode that S5, S6 are lower end, and upper end is emitter, it is that just upper end is negative that diode is lower end.Output point A point and B point lay respectively between S5, S2 and S6, S4.
Described newly-increased circuit structure is different, one tunnel increases circuit newly and comprises switching tube, the transmitting very positive input of switching tube, between the emitter of each switching tube and collector electrode, forward is connected with a diode, and emitter differential concatenation diode of switching tube; Another road increases circuit newly and comprises switching tube, the transmitting very positive input of switching tube, and between the emitter of each switching tube and collector electrode, forward is connected with a diode, collector electrode place differential concatenation diode of switching tube.
As shown in Figure 10, described DC bus capacitor is two, and midpoint extraction branch road connects two newly-increased circuit respectively by diode; And the closure of this diode is contrary with the closure of the diode of connecting with switching tube in newly-increased circuit.
Based on a switch modulating method for described H bridge photovoltaic DC-to-AC converter output voltage Current polarity detection, comprise following:
(1) in the positive half period of line voltage, when detecting that inverter output voltage is identical with current polarity, the switching tube high frequency mo on the right side of H bridge, is positioned at the switching tube conducting of opposite side in newly-increased circuit;
(2) when detecting that voltage and current polarity is contrary, this switching tube maintenance conducting state in circuit is increased newly, another switching tube of newly-increased circuit and the complementary high frequency mo of homonymy H bridge switch pipe;
(3) in the negative half-cycle of line voltage, when inverter output voltage is identical with current polarity, switching tube high frequency mo on the left of H bridge, the switching tube conducting on right side is positioned in newly-increased circuit, when inverter output voltage is contrary with current polarity, the switching tube being positioned at right side in newly-increased circuit keeps conducting state, is positioned at the switching tube in left side and the complementary high frequency mo of switching tube of homonymy H bridge branch road in newly-increased circuit.
As shown in Figure 2, namely in the positive half period of line voltage, when detecting that inverter output voltage is identical with current polarity, S3, S4 high frequency mo, S5 conducting, and when detecting that voltage and current polarity is contrary, S5 keeps conducting state, the complementary high frequency mo of S6 and S3, S4.In the negative half-cycle of line voltage, when inverter output voltage is identical with current polarity, S1, S2 high frequency mo, S6 conducting, when inverter output voltage is contrary with current polarity, S6 keeps conducting state, the complementary high frequency mo of S5 and S1, S2.
Beneficial effect of the present invention is:
(1) avoid the Power Exchange between DC bus capacitor and AC inductance in zero voltage state, and only flow through two switching tubes compared to other H6 inverter current under power mode, reduce conduction loss, thus improve efficiency;
(2) in zero voltage state photovoltaic panel and electrical network are isolated, thus keep the constant of common-mode voltage, inhibit the size of common mode leakage current;
(3) compared with traditional H full-bridge inverter, this circuit structure can make full use of components and parts performance, improves inverter efficiency and coefficient of safety, improves and exports the quality of power supply;
(4) problem of current non-isolation type single-phase photovoltaic grid-connected inverter common mode leakage current is effectively solved.
Accompanying drawing explanation
Fig. 1 is traditional H4 bridge photovoltaic combining inverter common mode loop equivalent circuit diagram;
Fig. 2 is circuit one structural representation of the present invention;
Fig. 3 is that circuit working of the present invention is in the current flowing schematic diagram of pattern one;
Fig. 4 is that circuit working of the present invention is in the current flowing schematic diagram of pattern two;
Fig. 5 is that circuit working of the present invention is in the current flowing schematic diagram of pattern three;
Fig. 6 is that circuit working of the present invention is in the current flowing schematic diagram of pattern four;
Fig. 7 is distortion topology one structure chart of novel inverter;
Fig. 8 is distortion topology two structure charts of novel inverter;
Fig. 9 is distortion topology three structure charts of novel inverter;
Figure 10 is distortion topology four structure charts of novel inverter.
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
Tradition H4 bridge photovoltaic combining inverter common mode loop equivalent circuit diagram as shown in Figure 1.
Topology of the present invention as shown in Figure 2, the basis of traditional H4 bridge inverter circuit adds two switching tubes S5, S6 and two diodes D1, D2.The modulation system of switch is divided into four-stage in the one-period of line voltage, is respectively pattern one to pattern four, as shown in Fig. 3 to Fig. 6.
In the negative half-cycle of line voltage, when detecting that inverter output voltage is identical with current polarity, S1, S2 high frequency mo, S6 conducting, and when detecting that voltage and current polarity is contrary, S6 keeps conducting state, the complementary high frequency mo of S5 and S1, S2.In the positive half period of line voltage, when inverter output voltage is identical with current polarity, S3, S4 high frequency mo, S5 conducting, when inverter output voltage is contrary with current polarity, S5 keeps conducting state, the complementary high frequency mo of S6 and S3, S4.
Photovoltaic panel and electrical network can be isolated under freewheeling state, under power mode, electric current only flows through two switching tubes, and conduction loss is little, and efficiency is high, and in whole grid cycle, keep common-mode voltage value to be constant, thus suppresses the size of common mode leakage current.
By detecting the polarity adjustment switch motion of inverter output voltage electric current, thus avoid inverter because of grid power influence of fluctuations or the current waveform distortion that works in non-unity power factor and cause.
In the negative half-cycle of line voltage, in pattern one as shown in Figure 3, inverter is in power stage state, switch S 1, S2 and S6 conducting, other switch OFF, common-mode voltage U now
cm=(0+U
dc)/2=U
dc/ 2, in the pattern two of electrical network negative half-cycle, as shown in Figure 4, inverter is in no-voltage freewheeling state, and switch S 1, S2 turn off, and S6 keeps conducting state, and now electric current flows through D2 and S6 formation afterflow passage, now common-mode voltage U
cm=(U
dc/ 2+U
dc/ 2)/2=U
dc/ 2.
In the positive half period of line voltage, in like manner, in pattern three as shown in Figure 5, inverter is in power stage state, switch S 3, S4 and S5 conducting, other switch OFF, common-mode voltage U now
cm=(U
dc+ 0)/2=U
dc/ 2, in the pattern four of electrical network positive half period, as shown in Figure 6, inverter is in no-voltage freewheeling state, and switch S 3, S4 turn off, and S5 keeps conducting state, and now electric current flows through D1 and S5 formation afterflow passage, now common-mode voltage U
cm=(U
dc/ 2+U
dc/ 2)/2=U
dc/ 2.
Like this within the whole cycle of line voltage, the common-mode voltage U of inverter
cmu is remained under switch high-frequency action
dc/ 2 is constant, therefore common mode leakage current I
cm=C
pVdU
cm/ dt will be suppressed greatly, thus eliminate the harm that the person or equipment are subject to leakage current.
Formulated when but above-mentioned switch modulation mode is run under unity power factor for inverter, and when invertor operation in non-unity power factor, power network current near zero-crossing point or be subject to grid power fluctuation affect time, the output voltage U of inverter
aBmay be contrary with the polarity of output current, namely under the freewheeling state of above-mentioned pattern two and pattern four, current polarity can be contrary with the direction of provided afterflow passage, so just can cause output current cannot normally afterflow, and then cause the waveform of electric current to distort.For this problem, propose a kind of switch modulation strategy based on inverter output voltage Current polarity detection, namely in the positive half period of line voltage, when detecting that inverter output voltage is identical with current polarity, S3, S4 high frequency mo, S5 conducting, and when detecting that voltage and current polarity is contrary, S5 keeps conducting state, the complementary high frequency mo of S6 and S3, S4.In the negative half-cycle of line voltage, when inverter output voltage is identical with current polarity, S1, S2 high frequency mo, S6 conducting, when inverter output voltage is contrary with current polarity, S6 keeps conducting state, the complementary high frequency mo of S5 and S1, S2.Like this, just can ensure under freewheeling state, when inverter output current polarity of voltage is different, output current wave does not distort, and then the quality of power supply is improved.
The present invention can carry out topology and change, and a kind of efficient H bridge photovoltaic DC-to-AC converter based on electric current and voltage Check up polarity, comprises photovoltaic battery panel, DC bus capacitor, AC filter inductance, H bridge inverter, 2 switching tubes and 2 diodes, wherein:
DC bus capacitor is connected in parallel on photovoltaic battery panel two ends, the connection H bridge inverter of photovoltaic battery panel, two mid points of H bridge inverter to be connected respectively a newly-increased circuit, described newly-increased circuit, for photovoltaic battery panel and electrical network being isolated under the freewheeling mode of no-voltage, and in zero voltage state for electric current provides freewheeling path, ensure that system common-mode voltage remains that the half of direct voltage is constant in the course of action of HF switch, to suppress the size of common mode leakage current;
The tie point place of H bridge inverter and newly-increased circuit stretches out four respectively and goes between, article four, lead-in wire does not belong to the same branch road of H bridge inverter and inconsistent being interconnected in position, form two branch roads, two branch roads connect AC two ends respectively by an AC filter inductance.
As shown in Figure 7, newly-increased circuit structure is identical, comprises diode and the switching tube of series connection respectively, the current collection very positive input of switching tube, between the collector electrode of each switching tube and emitter, Opposite direction connection has a diode, a diode and the emitter forward of switching tube is connected.
As shown in Figure 8, newly-increased circuit structure is identical, comprises diode and the switching tube of series connection respectively, the transmitting very positive input of switching tube, between the emitter of each switching tube and collector electrode, forward is connected with a diode, and emitter differential concatenation diode of switching tube.
As shown in Figure 9, newly-increased circuit structure is different, and a road increases circuit newly and comprises switching tube, the transmitting very positive input of switching tube, between the emitter of each switching tube and collector electrode, forward is connected with a diode, and emitter differential concatenation diode of switching tube; Another road increases circuit newly and comprises switching tube, the transmitting very positive input of switching tube, and between the emitter of each switching tube and collector electrode, forward is connected with a diode, collector electrode place differential concatenation diode of switching tube.
As shown in Figure 10, described DC bus capacitor is two, and midpoint extraction branch road connects two newly-increased circuit respectively by diode; And the closure of this diode is contrary with the closure of the diode of connecting with switching tube in newly-increased circuit.
As shown in Figure 8,9, in the filter inductance branch road between H bridge and electrical network, there are two lead-out wires, are connected on two brachium pontis of H-bridge circuit, these two lead-out wires increase by two inductance, the straight-through danger of inverter leg can be avoided.
As shown in Figure 10, the basis of Fig. 9 circuit topology increases by two diodes and an electric capacity, DC side power supply and two derided capacitors are in parallel, the half of direct voltage is clamped at the midpoint current potential of two derided capacitors, a diode is connected respectively with two brachium pontis mid points from the midpoint of derided capacitors, these two diode directions are contrary, diode D3 mono-termination derided capacitors mid point, in the middle of another termination D1 and S5, diode D4 mono-termination derided capacitors mid point, in the middle of another termination D2 and S6.For the circuit structure shown in Figure 10, S5 and S6 be high frequency mo in whole power frequency period, the complementary high frequency mo of S5, S6 and S1, S2 in electrical network positive half period, in electrical network negative half-cycle, and the complementary high frequency mo of S5, S6 and S3, S4.It is constant that two diodes increased can ensure that circuit common-mode voltage in freewheeling state is clamped to the half of direct voltage, reduces common mode leakage current further.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (5)
1. the switch modulating method based on the efficient H bridge photovoltaic DC-to-AC converter of electric current and voltage Check up polarity, the efficient H bridge photovoltaic DC-to-AC converter of described electric current and voltage Check up polarity, comprise photovoltaic battery panel, DC bus capacitor, AC filter inductance, H bridge inverter, 2 switching tubes and 2 diodes, wherein:
DC bus capacitor is connected in parallel on photovoltaic battery panel two ends, photovoltaic battery panel connects H bridge inverter, two mid points of H bridge inverter to be connected respectively a newly-increased circuit, described newly-increased circuit, for photovoltaic battery panel and electrical network being isolated under the freewheeling mode of no-voltage, and in zero voltage state for electric current provides freewheeling path, ensure that system common-mode voltage remains that the half of direct voltage is constant in the course of action of HF switch, to suppress the size of common mode leakage current;
The tie point place of H bridge inverter and newly-increased circuit stretches out four respectively and goes between, article four, lead-in wire does not belong to the same branch road of H bridge inverter and inconsistent being interconnected in position, form two branch roads, two branch roads connect AC two ends respectively by an AC filter inductance and it is characterized in that: comprise the following steps:
(1) in the positive half period of line voltage, when detecting that inverter output voltage is identical with current polarity, the switching tube high frequency mo on the right side of H bridge, is positioned at the switching tube conducting of opposite side in newly-increased circuit;
(2) when detecting that voltage and current polarity is contrary, this switching tube maintenance conducting state in circuit is increased newly, another switching tube of newly-increased circuit and the complementary high frequency mo of homonymy H bridge switch pipe;
(3) in the negative half-cycle of line voltage, when inverter output voltage is identical with current polarity, switching tube high frequency mo on the left of H bridge, the switching tube conducting on right side is positioned in newly-increased circuit, when inverter output voltage is contrary with current polarity, the switching tube being positioned at right side in newly-increased circuit keeps conducting state, is positioned at the switching tube in left side and the complementary high frequency mo of switching tube of homonymy H bridge branch road in newly-increased circuit.
2. switch modulating method as claimed in claim 1, it is characterized in that: described newly-increased circuit structure is identical, comprise diode and the switching tube of series connection respectively, the current collection very positive input of switching tube, between the collector electrode of each switching tube and emitter, Opposite direction connection has a diode, a diode and the emitter forward of switching tube is connected.
3. switch modulating method as claimed in claim 1, it is characterized in that: described newly-increased circuit structure is identical, comprise diode and the switching tube of series connection respectively, the transmitting very positive input of switching tube, between the emitter of each switching tube and collector electrode, forward is connected with a diode, and emitter differential concatenation diode of switching tube.
4. switch modulating method as claimed in claim 1, it is characterized in that: described newly-increased circuit structure is different, one tunnel increases circuit newly and comprises switching tube, the transmitting very positive input of switching tube, between the emitter of each switching tube and collector electrode, forward is connected with a diode, and emitter differential concatenation diode of switching tube; Another road increases circuit newly and comprises switching tube, the transmitting very positive input of switching tube, and between the emitter of each switching tube and collector electrode, forward is connected with a diode, collector electrode place differential concatenation diode of switching tube.
5. switch modulating method as claimed in claim 4, is characterized in that: the DC bus capacitor of described H bridge photovoltaic DC-to-AC converter is two, and midpoint extraction branch road connects two newly-increased circuit respectively by diode; And the closure of this diode is contrary with the closure of the diode of connecting with switching tube in newly-increased circuit.
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| CN106961226B (en) * | 2017-03-10 | 2023-05-12 | 华东交通大学 | Six-switch micro-inverter alternating-current side power coupling circuit |
| CN107861019B (en) * | 2017-11-23 | 2023-09-05 | 深圳市巴丁微电子有限公司 | H-bridge detection system and detection method |
| CN109245588A (en) * | 2018-09-30 | 2019-01-18 | 华南理工大学 | A kind of novel single-phase non-isolated active clamp gird-connected inverter |
| CN110912193B (en) * | 2019-12-09 | 2020-11-06 | 华东交通大学 | Micro-inverter alternating current side power coupling system and control method |
| CN117040307B (en) * | 2023-09-27 | 2023-12-19 | 大秦数字能源技术股份有限公司 | Inverter circuit, inverter and inversion method |
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| CN102611347A (en) * | 2011-01-21 | 2012-07-25 | 北京动力源科技股份有限公司 | Single-phase non-isolated solar grid-connected 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 |
| CN103051233A (en) * | 2012-12-12 | 2013-04-17 | 东南大学 | Non-isolated single-phase photovoltaic grid-connected inverter and on-off control timing sequence thereof |
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