CN103427435A - Three-phase non-isolation type photovoltaic grid-connected inverter and photovoltaic power generation system - Google Patents
Three-phase non-isolation type photovoltaic grid-connected inverter and photovoltaic power generation system Download PDFInfo
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- CN103427435A CN103427435A CN201210154688XA CN201210154688A CN103427435A CN 103427435 A CN103427435 A CN 103427435A CN 201210154688X A CN201210154688X A CN 201210154688XA CN 201210154688 A CN201210154688 A CN 201210154688A CN 103427435 A CN103427435 A CN 103427435A
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- 238000010248 power generation Methods 0.000 title abstract 2
- 239000003990 capacitor Substances 0.000 claims description 35
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- 230000003071 parasitic effect Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
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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
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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
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Abstract
The invention discloses a three-phase non-isolation type photovoltaic grid-connected inverter and a photovoltaic power generation system. The three-phase non-isolation type photovoltaic grid-connected inverter comprises a three-phase full bridge converter and a filter circuit, wherein the three-phase full bridge converter is in parallel connection between two electrode plates of a solar cell panel array, the middle point of a three-phase full bridge converter is connected with the filter circuit, and the other end of the filter circuit is connected with a negative electrode plate of the solar cell panel array. By the adoption of the three-phase non-isolation type photovoltaic grid-connected inverter, the manufacturing cost can be reduced, and the reliability can be improved.
Description
Technical field
The present invention relates to electric and electronic technical field, relate in particular to a kind of three-phase non-isolated photovoltaic grid-connected inverter and a kind of photovoltaic generating system.
Background technology
Photovoltaic (photovoltaic, be called for short PV), electricity generation system is comprised of panel array and power conversion part (inverter) usually, and inverter completes cell panel MPPT maximum power point tracking (maximum power point tracking is called for short MPPT) and grid current is controlled.Place the low frequency isolation transformer and realize electrical network and PV electrical isolation between inverter and electrical network, ensure personal safety, can provide voltage matches and grid current DC component to suppress simultaneously.But low-frequency transformer has increased volume, quality and cost, reduced conversion efficiency.Inserting high frequency transformer in the prime of PV system is a kind of alternative measure, has reduced to a great extent volume, and quality and cost, but make power conversion more complicated, and system effectiveness is not obviously improved.
Non-isolated combining inverter structure, containing transformer (high and low frequency), does not have conversion efficiency high, the advantage that volume, weight and cost are low.But the elimination of transformer makes PV and electrical network that electrical connection arranged, common mode current may significantly increase, and brings potential safety hazard.
Yet, existing solve potential safety hazard that common mode current brings greatly scheme in, the inventor finds that in prior art, there are the following problems:
If directly with common mode inductance, common mode current is suppressed, it is pressed onto below the mark, the inductance value needed is very large, can cause the common mode inductance volume excessive, high cost.
Summary of the invention
Embodiments of the invention provide a kind of three-phase non-isolated photovoltaic grid-connected inverter and a kind of photovoltaic generating system.For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of three-phase non-isolated photovoltaic grid-connected inverter comprises: three phase full bridge circuit and filter circuit;
Described three phase full bridge circuit is parallel between the solar panel array two-plate and is connected, and described three phase full bridge circuit mid point is connected with described filter circuit;
The described filter circuit other end is connected with the negative plate of described solar panel array.
A kind of photovoltaic generating system, this system comprises three-phase non-isolated photovoltaic grid-connected inverter as above.
A kind of three-phase non-isolated photovoltaic grid-connected inverter and a kind of photovoltaic generating system that the embodiment of the present invention provides, by the described filter circuit other end being linked into to the negative plate of described solar panel array, be that shunt capacitance (being the filter capacitor in filter circuit) is drawn back DC side by common mode current from inside circuit, avoided common mode current by the parasitic capacitance between cell panel and ground, avoided leakage current to exceed standard, thereby make three-phase non-isolated photovoltaic grid-connected inverter of the present invention and photovoltaic generating system not only can greatly reduce manufacturing cost, can also improve reliability, reduce the potential safety hazard probability.
The accompanying drawing explanation
A kind of three-phase non-isolated photovoltaic grid-connected inverter schematic diagram that Fig. 1 provides for the embodiment of the present invention;
A kind of three-phase non-isolated photovoltaic grid-connected inverter circuit diagram that Fig. 2 provides for the embodiment of the present invention;
The another kind of three-phase non-isolated photovoltaic grid-connected inverter circuit diagram that Fig. 3 provides for the embodiment of the present invention;
A kind of photovoltaic generating system structural representation that Fig. 4 provides for the embodiment of the present invention.
Embodiment
A kind of three-phase non-isolated photovoltaic grid-connected inverter and a kind of photovoltaic generating system that the embodiment of the present invention are provided below in conjunction with accompanying drawing are described in detail.
As shown in Figure 1, a kind of three-phase non-isolated photovoltaic grid-connected inverter provided for the embodiment of the present invention; This inverter is the power conversion part in photovoltaic generating system; Also include CP1 and CP2 in photovoltaic generating system; Described CP1 and CP2 are solar energy pole plate parasitic capacitance over the ground.This parasitic capacitance, solar energy pole plate and three phase full bridge circuit, filter circuit, electrical network forms the common mode current loop; Described three-phase non-isolated photovoltaic grid-connected inverter comprises: three phase full bridge circuit and filter circuit;
Described three phase full bridge circuit is parallel between the solar panel array two-plate (be PV+ with PV-between) and is connected, and described three phase full bridge circuit mid point is connected with described filter circuit;
The described filter circuit other end is connected with the negative plate of described solar panel array.
It should be noted that this inverter, can also comprise: common mode inductance Lc; Described common mode inductance Lc is connected between described three phase full bridge circuit mid point and described filter circuit.
Based on above embodiment, as shown in Figure 2, a kind of three-phase non-isolated photovoltaic grid-connected inverter provided for the embodiment of the present invention; This inverter draws back DC side by common mode current from inside circuit by shunt capacitance (being the filter capacitor in filter circuit), has avoided common mode current by the parasitic capacitance between cell panel and ground, has avoided leakage current to exceed standard.The specific implementation circuit is as follows: described three-phase non-isolated photovoltaic grid-connected inverter comprises: three phase full bridge circuit and filter circuit;
Described three phase full bridge circuit comprises: transistor S1, transistor S2, transistor S3, transistor S4, transistor S5, transistor S6;
Described filter circuit comprises: filter inductance L1, filter inductance L2, filter inductance L3 and filter capacitor C1, filter capacitor C2, filter capacitor C3;
The collector electrode of described transistor S1, transistor S2, the transistor S3 positive plate with described solar panel array that is connected in parallel; The emitter of described transistor S4, transistor S5, the transistor S6 negative plate with described solar panel array that is connected in parallel; The emitter of described transistor S1 is connected with the collector electrode of described transistor S4; The emitter of described transistor S2 is connected with the collector electrode of described transistor S5; The emitter of described transistor S3 is connected with the collector electrode of described transistor S6;
Wherein, the tie point of the collector electrode of the emitter of described transistor S1 and described transistor S4 is described three phase full bridge circuit mid point Z1; The tie point of the collector electrode of the emitter of described transistor S2 and described transistor S5 is described three phase full bridge circuit mid point Z2; The tie point of the collector electrode of the emitter of described transistor S3 and described transistor S6 is described three phase full bridge circuit mid point Z3;
Described filter inductance L1 mono-end is connected with described mid point Z1, and the other end is connected with described filter capacitor C1 mono-end;
Described filter inductance L2 mono-end is connected with described mid point Z2, and the other end is connected with described filter capacitor C2 mono-end;
Filter inductance L3 mono-end is connected with described mid point Z3, and the other end is connected with described filter capacitor C3 mono-end;
The other end of described filter capacitor C1, filter capacitor C2, filter capacitor C3 is parallel-connected to the negative plate of described solar panel array.
It is also to be noted that, described filter circuit can also comprise: Electro Magnetic Compatibility (Electro Magnetic Compatibility is called for short EMC) filter circuit
The EMC filter circuit); Described Electro Magnetic Compatibility filter circuit and described filter inductance L1, filter inductance L2, the filter inductance L3 other end are connected in parallel.
As shown in Figure 3, the another kind of three-phase non-isolated photovoltaic grid-connected inverter provided for the embodiment of the present invention; This inverter, by the method that adopts common mode inductance filtering to combine with capacitive bypass, suppresses common mode current.The specific implementation circuit is as follows: described three-phase non-isolated photovoltaic grid-connected inverter comprises: three phase full bridge circuit, filter circuit and common mode inductance Lc;
Described three phase full bridge circuit is parallel between the solar panel array two-plate and is connected, and described three phase full bridge circuit mid point is connected with described filter circuit; The described filter circuit other end is connected with the negative plate of described solar panel array.Described common mode inductance Lc is connected between described three phase full bridge circuit mid point and described filter circuit.
Described three phase full bridge circuit comprises: transistor S1, transistor S2, transistor S3, transistor S4, transistor S5, transistor S6;
Described filter circuit comprises: filter inductance L1, filter inductance L2, filter inductance L3 and filter capacitor C1, filter capacitor C2, filter capacitor C3;
The collector electrode of described transistor S1, transistor S2, the transistor S3 positive plate with described solar panel array that is connected in parallel; The emitter of described transistor S4, transistor S5, the transistor S6 negative plate with described solar panel array that is connected in parallel; The emitter of described transistor S1 is connected with the collector electrode of described transistor S4; The emitter of described transistor S2 is connected with the collector electrode of described transistor S5; The emitter of described transistor S3 is connected with the collector electrode of described transistor S6;
Wherein, the tie point of the collector electrode of the emitter of described transistor S1 and described transistor S4 is described three phase full bridge circuit mid point Z1; The tie point of the collector electrode of the emitter of described transistor S2 and described transistor S5 is described three phase full bridge circuit mid point Z2; The tie point of the collector electrode of the emitter of described transistor S3 and described transistor S6 is described three phase full bridge circuit mid point Z3;
The terminal 1 of described common mode inductance Lc is connected with described mid point Z1;
The terminal 2 of described common mode inductance Lc is connected with described mid point Z2;
The terminal 3 of described common mode inductance Lc is connected with described mid point Z3;
The terminal 4 of described common mode inductance Lc is connected with described filter inductance L1 mono-end;
The terminal 5 of described common mode inductance Lc is connected with described filter inductance L2 mono-end;
The terminal 6 of described common mode inductance Lc is connected with described filter inductance L3 mono-end.
The described filter inductance L1 other end is connected with described filter capacitor C1 mono-end;
The described filter inductance L2 other end is connected with described filter capacitor C2 mono-end;
The described filter inductance L3 other end is connected with described filter capacitor C3 mono-end;
The other end of described filter capacitor C1, filter capacitor C2, filter capacitor C3 is parallel-connected to the negative plate of described solar panel array.
As shown in Figure 4, be a kind of photovoltaic generating system that the embodiment of the present invention provides, this system comprises: the above any one three-phase non-isolated photovoltaic grid-connected inverter.
It should be noted that, transistor described in this patent can be insulated gate bipolar transistor (Insulated Gate Bipolar Transistor is called for short IGBT).
Also it should be noted that, only the mid point of output differential mode filter capacitor (being filter capacitor C1-C3) need be connected to the negative plate of solar panel in this patent, for common mode current, described filter capacitor C1-C3 electric capacity is equivalent in parallel with solar panel with the parasitic capacitance between ground, leakage current is after common mode inductance Lc filtering, through shunt capacitance (being filter capacitor C1-C3), shunt again, thus the limit leakage current size.Inverter all needs to export the differential mode filter capacitor, without separately adding electric capacity, just can realize the function of shunt capacitance.
A kind of three-phase non-isolated photovoltaic grid-connected inverter and a kind of photovoltaic generating system that the embodiment of the present invention provides, by the described filter circuit other end being linked into to the negative plate of described solar panel array, be that shunt capacitance (being the filter capacitor in filter circuit) is drawn back DC side by common mode current from inside circuit, avoid common mode current by the parasitic capacitance between cell panel and ground, avoided leakage current to exceed standard; Perhaps, the method that adopts common mode inductance filtering to combine with capacitive bypass suppresses common mode current jointly, thereby make three-phase non-isolated photovoltaic grid-connected inverter of the present invention and photovoltaic generating system not only can greatly reduce manufacturing cost, can also improve reliability, reduce the potential safety hazard probability.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by the described protection range with claim.
Claims (7)
1. a three-phase non-isolated photovoltaic grid-connected inverter, is characterized in that, comprising: three phase full bridge circuit and filter circuit;
Described three phase full bridge circuit is parallel between the solar panel array two-plate and is connected, and described three phase full bridge circuit mid point is connected with described filter circuit;
The described filter circuit other end is connected with the negative plate of described solar panel array.
2. three-phase non-isolated photovoltaic grid-connected inverter according to claim 1, is characterized in that, also comprises: common mode inductance Lc; Described common mode inductance Lc is connected between described three phase full bridge circuit mid point and described filter circuit.
3. three-phase non-isolated photovoltaic grid-connected inverter according to claim 1 and 2, is characterized in that,
Described three phase full bridge circuit comprises: transistor S1, transistor S2, transistor S3, transistor S4, transistor S5, transistor S6;
Described filter circuit comprises: filter inductance L1, filter inductance L2, filter inductance L3 and filter capacitor C1, filter capacitor C2, filter capacitor C3;
The collector electrode of described transistor S1, transistor S2, the transistor S3 positive plate with described solar panel array that is connected in parallel; The emitter of described transistor S4, transistor S5, the transistor S6 negative plate with described solar panel array that is connected in parallel; The emitter of described transistor S1 is connected with the collector electrode of described transistor S4; The emitter of described transistor S2 is connected with the collector electrode of described transistor S5; The emitter of described transistor S3 is connected with the collector electrode of described transistor S6;
Wherein, the tie point of the collector electrode of the emitter of described transistor S1 and described transistor S4 is described three phase full bridge circuit mid point Z1; The tie point of the collector electrode of the emitter of described transistor S2 and described transistor S5 is described three phase full bridge circuit mid point Z2; The tie point of the collector electrode of the emitter of described transistor S3 and described transistor S6 is described three phase full bridge circuit mid point Z3;
Described filter inductance L1 mono-end is connected with described mid point Z1, and the other end is connected with described filter capacitor C1 mono-end;
Described filter inductance L2 mono-end is connected with described mid point Z2, and the other end is connected with described filter capacitor C2 mono-end;
Filter inductance L3 mono-end is connected with described mid point Z3, and the other end is connected with described filter capacitor C3 mono-end;
The other end of described filter capacitor C1, filter capacitor C2, filter capacitor C3 is parallel-connected to the negative plate of described solar panel array.
4. three-phase non-isolated photovoltaic grid-connected inverter according to claim 3, is characterized in that, the terminal 1 of described common mode inductance Lc is connected with described mid point Z1;
The terminal 2 of described common mode inductance Lc is connected with described mid point Z2;
The terminal 3 of described common mode inductance Lc is connected with described mid point Z3;
The terminal 4 of described common mode inductance Lc is connected with described filter inductance L1 mono-end;
The terminal 5 of described common mode inductance Lc is connected with described filter inductance L2 mono-end;
The terminal 6 of described common mode inductance Lc is connected with described filter inductance L3 mono-end.
5. three-phase non-isolated photovoltaic grid-connected inverter according to claim 4, is characterized in that, described filter circuit also comprises: the Electro Magnetic Compatibility filter circuit; Described Electro Magnetic Compatibility filter circuit and described filter inductance L1, filter inductance L2, the filter inductance L3 other end are connected in parallel.
6. three-phase non-isolated photovoltaic grid-connected inverter according to claim 5, is characterized in that, described transistor is insulated gate bipolar transistor.
7. a photovoltaic generating system, is characterized in that, this system comprises three-phase non-isolated photovoltaic grid-connected inverter as described as any one in claim 1 to 6.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104038094A (en) * | 2014-04-01 | 2014-09-10 | 燕山大学 | Non-isolated three-phase photovoltaic grid-connected inverter and control method |
| CN110690830A (en) * | 2018-06-20 | 2020-01-14 | 浙江昱能科技有限公司 | Three-phase inverter and control method thereof |
| CN112751497A (en) * | 2019-10-30 | 2021-05-04 | 昱能科技股份有限公司 | Control method and system of three-phase grid-connected inverter and three-phase grid-connected inverter |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038094A (en) * | 2014-04-01 | 2014-09-10 | 燕山大学 | Non-isolated three-phase photovoltaic grid-connected inverter and control method |
| CN104038094B (en) * | 2014-04-01 | 2017-01-18 | 燕山大学 | Control method of non-isolated three-phase photovoltaic grid-connected inverter |
| CN110690830A (en) * | 2018-06-20 | 2020-01-14 | 浙江昱能科技有限公司 | Three-phase inverter and control method thereof |
| CN112751497A (en) * | 2019-10-30 | 2021-05-04 | 昱能科技股份有限公司 | Control method and system of three-phase grid-connected inverter and three-phase grid-connected inverter |
| WO2021082220A1 (en) * | 2019-10-30 | 2021-05-06 | 浙江昱能科技有限公司 | Control method and system for three-phase grid-connected inverter, and three-phase grid-connected inverter |
| CN112751497B (en) * | 2019-10-30 | 2022-03-08 | 昱能科技股份有限公司 | Control method and system of three-phase grid-connected inverter and three-phase grid-connected inverter |
| US11770065B2 (en) | 2019-10-30 | 2023-09-26 | Altenergy Power System Inc. | Control method and system for three-phase grid-connected inverter, and three-phase grid-connected inverter |
| EP4054070A4 (en) * | 2019-10-30 | 2023-11-01 | Altenergy Power System Inc. | METHOD AND SYSTEM FOR CONTROLLING A THREE-PHASE GRID-COUPLED INVERTER AND THREE-PHASE GRID-COUPLED INVERTER |
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