CN104795985A - Photovoltaic system capable of preventing PID effects - Google Patents
Photovoltaic system capable of preventing PID effects Download PDFInfo
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- CN104795985A CN104795985A CN201510196973.1A CN201510196973A CN104795985A CN 104795985 A CN104795985 A CN 104795985A CN 201510196973 A CN201510196973 A CN 201510196973A CN 104795985 A CN104795985 A CN 104795985A
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- inverter
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- photovoltaic module
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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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 photovoltaic system capable of preventing PID effects. The photovoltaic system comprises a photovoltaic component, an inverter and an anti-reflux controller, wherein the direct-current side of the inverter is connected with the photovoltaic component, the alternating-current side of the inverter is connected with a power grid, a negative boosting device is further connected between the inverter and the photovoltaic component, and the negative boosting device is used for increasing the negative-end voltage-to-ground of the photovoltaic component; the anti-reflux controller detects the power grid through a sampling module and controls the working states of the inverter and the negative boosting device through detecting signals. The photovoltaic system has the advantages that the front end of the inverter adopts the negative boosting device, the negative negative-end voltage-to-ground of the photovoltaic component is reduced or allowed to be not smaller than 0, the negative-end voltage-to-ground of the photovoltaic component is allowed to be small or positive, and the PID effects of the non-isolation single-phase inverter on the component are eliminated.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, be specifically related to a kind of photovoltaic system of anti-PID effect.
Background technology
Photovoltaic application is more and more extensive, and power plant scale is increasing, and the quantity of assembly series connection constantly increases.The probability that assembly bears highland potential energy is increasing, due to the existence of high pressure, there is leakage current between internal current conductor and the earth between (passing through frame).This leakage current may cause the decay of component power, usually this decay potential energy induced attenuation, i.e. PID.
PID is that Sunpower found in 2005 the earliest, assembly makes to there is leakage current between glass, encapsulating material for a long time under action of high voltage, a large amount of accumulation is on cell piece surface, the passivation effect of battery surface is worsened, cause FF, Jsc, Voc to reduce, make assembly property lower than design standard.In 2010, NREL and Solon confirmed the p-type crystal-silicon battery slice no matter which kind of technology assembly adopts, and assembly has the risk of PID under back bias voltage.
The method that current tradition recovers PID phenomenon has:
1. adopt the minus earth of series component;
2. apply positive voltage in night between assembly and the earth.
The contrast table of table 1. two kinds of restoration methods
For photovoltaic DC-to-AC converter, what can impact photovoltaic module only has polarity and leakage current two aspects over the ground.
The size of leakage current mainly changes relevant with cell panel direct-to-ground capacitance and cell plate voltage over the ground.The direct-to-ground capacitance of cell panel, only with cell panel structure and install relevant, does not affect by inverter; But the change of voltage to earth is but relevant with inverter topology and modulation system thereof, does not discuss at this.
Polarity is relevant with mode of operation with inverter topology over the ground; In solar inverter topology, mainly contain band transformer type inverter and inverter without transformer two kinds.
2.1. according to the difference of transformer operating frequency, band transformer type inverter topology can be divided into band Industrial Frequency Transformer photovoltaic DC-to-AC converter and band high frequency transformer photovoltaic DC-to-AC converter two kinds: as shown in Figure 1, to be made up of the full-bridge inverter of and the Industrial Frequency Transformer of a 50Hz with Industrial Frequency Transformer photovoltaic DC-to-AC converter and to form, owing to having transformer isolation at output, avoid the existence of grid-connected leakage current and DC deviator, can (+) of solar panel end or (-) end ground connection.As shown in Figure 2, be made up of the DC-DC converter and a full-bridge inverter being with high frequency transformer with high frequency transformer photovoltaic DC-to-AC converter, owing to there is transformer isolation between constrained input, can avoid inputting direct-to-ground capacitance and the impact of voltage to earth change on output leakage current.Identical with band Industrial Frequency Transformer inverter, according to the needs of cell panel, can (+) of cell panel end or (-) end ground connection.
For above two kinds of topologys, although there is various different mode of operation, but due to the existence of isolating transformer, the performance of assembly can not affect by this.Shortcoming is the existence of transformer, and efficiency decreases, and volume, cost are high.
2.2. as shown in Figure 3, single-phase inverter without transformer generally adopts BOOST booster converter+DC/AC converter at present.This Non-isolation model, no matter rear class DC/AC adopts any topology, and it is negative for all there is assembly negative terminal voltage to earth, may cause the problem that photovoltaic module corrodes.
Therefore, how designing a kind of photovoltaic system of PID effect that effectively prevents is industry technical problem urgently to be resolved hurrily.
Summary of the invention
For solving the problems of the technologies described above, the present invention proposes a kind of photovoltaic system effectively preventing PID effect, and the inverter in this photovoltaic system is non-isolated single-phase inverter.Inverter adopts negative boosting BOOST mode by prime, be that the phenomenon of negative pressure is converted to the voltage of PV-to the earth and equals to be greater than 0 or reduce negative pressure between the two the voltage of photovoltaic module input PV-to the earth, thus eliminate or reduce non-isolated single-phase inverter produces PID phenomenon to assembly.
The present invention proposes a kind of photovoltaic system of anti-PID effect, comprise: photovoltaic module, inverter and Anti-reflux controller, the DC side of inverter is connected with photovoltaic module, AC is connected with electrical network, also be connected with negative increasing apparatus between inverter and photovoltaic module, described negative increasing apparatus is for promoting the negative terminal voltage to earth of photovoltaic module.Anti-reflux controller is detected electrical network by a sampling module, and controls the operating state of described inverter and negative increasing apparatus according to detection signal.
In one embodiment, negative increasing apparatus comprises: the first inductance, field effect transistor and diode, the negative electrode of diode connects the negative terminal of photovoltaic module through the first inductance, the negative electrode of diode connects the anode of photovoltaic module through field effect transistor simultaneously, the plus earth of diode; The DC bus anode of described inverter connects the anode of photovoltaic module, the negativing ending grounding of DC bus.
In another embodiment, negative increasing apparatus comprises: the first inductance, field effect transistor and diode, the negative electrode of diode connects the negative terminal of photovoltaic module through field effect transistor, the negative electrode of diode is through the first inductance ground connection simultaneously, and the anode of diode connects the DC bus negative terminal of inverter; The anode of described photovoltaic module and the equal ground connection of DC bus anode of inverter.
Preferably, LC filter is connected with between inverter and electrical network.
Wherein, LC filter comprises: the second inductance and the second electric capacity, and between the outlet side that described second inductance is connected on DC/AC inverter circuit and electrical network, the second Capacitance parallel connection is at the two ends of electrical network.
In general, DC/AC inverter circuit adopts full-bridge or half-bridge inversion circuit.
Relay is in series with, the break-make of Anti-reflux controller control relay between inverter and electrical network.
Preferably, Anti-reflux controller also connects a backstage host computer and a display unit.
During practical application, the chip model that Anti-reflux controller adopts is TMS320F28069.
Inverter of the present invention adopts negative increasing apparatus by prime, cleverly the just boosting at conventional photovoltaic assembly two ends is changed into negative boosting, be that negative pressure appearance is converted to negative terminal and reduces the negative pressure of large ground voltage or to be more than or equal to 0 the negative terminal of photovoltaic module to large ground voltage, thus it is less or be the object of positive voltage to achieve photovoltaic module negative terminal negative voltage over the ground, eliminates non-isolated single-phase inverter produces PID phenomenon to assembly.
Accompanying drawing explanation
Below in conjunction with embodiment and accompanying drawing, the present invention is described in detail, wherein:
Fig. 1 is the circuit connection diagram with Industrial Frequency Transformer in prior art;
Fig. 2 is the circuit connection diagram with high frequency transformer in prior art;
Fig. 3 is the circuit connection diagram of single-phase inverter without transformer in prior art;
Fig. 4 is the control principle block diagram of photovoltaic system of the present invention;
Fig. 5 is the full-bridge H4 inverter circuit connection layout of inverter in one embodiment of the invention;
Fig. 6 is the full-bridge H6 inverter circuit connection layout of inverter in one embodiment of the invention;
Fig. 7 is the full bridge inverter connection layout of inverter in another embodiment of the present invention.
Embodiment
As shown in Figure 4, the photovoltaic system of the anti-PID effect that the present invention proposes, comprise: photovoltaic module 1, inverter 2 and Anti-reflux controller, the DC side of inverter 2 is connected with photovoltaic module 1, AC is connected with electrical network, also be connected with negative increasing apparatus 3 between inverter 2 and photovoltaic module 1, negative increasing apparatus 3 is for promoting the negative terminal voltage to earth of photovoltaic module 1.Anti-reflux controller is detected electrical network by a sampling module, sampling module gathers the voltage of electrical network, current value be converted into signal, signal is sent to Anti-reflux controller, and Anti-reflux controller adjusts the operating state of inverter 2 and negative increasing apparatus 1 according to detection signal.
As shown in Figure 5, this inverter 2 comprises: DC bus 21 in parallel and DC/AC inverter circuit 22, the input side of DC bus 21 is connected with photovoltaic module 1, and the outlet side of DC/AC inverter circuit 22 is connected with electrical network, and negative increasing apparatus 3 is connected between photovoltaic module 1 and DC bus 21.Wherein, DC bus 21 is made up of the first electric capacity being connected in parallel on DC/AC inverter circuit input side, and Anti-reflux controller is connected with DC/AC inverter circuit 22 and negative increasing apparatus 3 respectively by an actuator.
As shown in Figure 5,6, in one embodiment, negative increasing apparatus 3 comprises: the first inductance, field effect transistor and diode, the negative electrode of diode connects the negative terminal of photovoltaic module through the first inductance, the negative electrode of diode connects the anode of photovoltaic module through field effect transistor simultaneously, the plus earth of diode, the anode of DC bus connects the anode of photovoltaic module, the negativing ending grounding of DC bus.
Photovoltaic module 1 is by negative increasing apparatus 3, namely be negative boosting BOOST circuit in the present embodiment, the negative terminal voltage of photovoltaic module 1 risen to DC bus 21 (about-380Vdc), then through DC/AC inverter circuit 22, utilize sinusoidal pulse width modulation principle, produce SPWM sinusoidal wave.In the present embodiment, negative increasing apparatus 3 is adopted by prime, cleverly the just boosting at conventional photovoltaic assembly two ends is changed into negative boosting, be that negative pressure appearance is converted to negative terminal and reduces the negative pressure of large ground voltage or to be more than or equal to 0 the negative terminal of photovoltaic module 1 to large ground voltage, thus it is less or be the object of positive voltage to achieve photovoltaic module negative terminal negative voltage over the ground, eliminates non-isolated single-phase inverter produces PID phenomenon to assembly.
As shown in Figure 7, in another embodiment, negative increasing apparatus 3 comprises: the first inductance, field effect transistor and diode, and the negative electrode of diode connects the negative terminal of photovoltaic module through field effect transistor, the negative electrode of diode is through the first inductance ground connection simultaneously, and the anode of diode connects the negative terminal of DC bus; The anode of photovoltaic module 1 and the positive ending grounding of DC bus 21.
The positive ending grounding of photovoltaic module 1, the negative terminal of photovoltaic module 1 connects the input of reversed polarity device, by negative increasing apparatus 3 i.e. BUCK-BOOST circuit, by near for the negative terminal negative voltage of photovoltaic module 1 DC bus 21 (about-380Vdc), again through DC/AC circuit 22, utilize sinusoidal pulse width modulation principle, produce SPWM sinusoidal wave.In the present embodiment, negative increasing apparatus is adopted to change the mode of negative pressure by prime, be that positive voltage is inverted by conventional photovoltaic assembly anode to photovoltaic module negative terminal cleverly, becoming photovoltaic module anode to photovoltaic module negative terminal is negative voltage, thus achieve the object that photovoltaic module negative terminal is positive voltage over the ground, eliminate non-isolated single-phase inverter produces PID phenomenon to assembly.
Preferably, LC filter 4 is connected with between inverter 2 and electrical network.Wherein, LC filter 4 comprises: the second inductance and the second electric capacity, and between the outlet side that the second inductance is connected on DC/AC inverter circuit 22 and electrical network, the second Capacitance parallel connection is at the two ends of electrical network.The sine wave that DC/AC inverter circuit 22 produces obtains controlled sinusoidal current after LC filter 4.
In general, DC/AC inverter circuit 22 adopts full-bridge or half-bridge inversion circuit.
Preferably, as shown in Figure 4, between inverter 2 and electrical network, relay is in series with, the break-make of Anti-reflux controller control relay.Anti-reflux controller, by judging the voltage and current signal that sampling module gathers, judges whether system has reverse current to occur, if there is reverse current, then starts to reduce inverter output current, until reverse current disappears or reaches in normal range (NR), or directly disconnects relay.
Further, Anti-reflux controller also connects a backstage host computer and a display unit, so that the control procedure of adjustment in time and monitoring Anti-reflux controller.When practical application, the chip model that Anti-reflux controller adopts is chosen as TMS320F28069.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a photovoltaic system for anti-PID effect, is characterized in that comprising: photovoltaic module, inverter and Anti-reflux controller, the DC side of inverter is connected with photovoltaic module, AC is connected with electrical network; Also be connected with negative increasing apparatus between described inverter and photovoltaic module, described negative increasing apparatus is for promoting the negative terminal voltage to earth of photovoltaic module;
Described Anti-reflux controller is detected electrical network by a sampling module, and controls the operating state of described inverter and negative increasing apparatus according to detection signal.
2. photovoltaic system as claimed in claim 1, it is characterized in that, described negative increasing apparatus comprises: the first inductance, field effect transistor and diode, the negative electrode of diode connects the negative terminal of photovoltaic module through the first inductance, the negative electrode of diode connects the anode of photovoltaic module through field effect transistor simultaneously, the plus earth of diode; The DC bus anode of described inverter connects the anode of photovoltaic module, the negativing ending grounding of DC bus.
3. photovoltaic system as claimed in claim 1, it is characterized in that, described negative increasing apparatus comprises: the first inductance, field effect transistor and diode, the negative electrode of diode connects the negative terminal of photovoltaic module through field effect transistor, the negative electrode of diode is through the first inductance ground connection simultaneously, and the anode of diode connects the DC bus negative terminal of inverter; The anode of described photovoltaic module and the equal ground connection of DC bus anode of inverter.
4. the photovoltaic system as described in above-mentioned arbitrary claim, is characterized in that, is connected with LC filter between described inverter and electrical network.
5. photovoltaic system as claimed in claim 4, it is characterized in that, described LC filter comprises: the second inductance and the second electric capacity, and between the outlet side that described second inductance is connected on DC/AC inverter circuit and electrical network, described second Capacitance parallel connection is at the two ends of electrical network.
6. photovoltaic system as claimed in claim 5, is characterized in that, described DC/AC inverter circuit adopts full-bridge or half-bridge inversion circuit.
7. photovoltaic system as claimed in claim 4, it is characterized in that, be in series with relay between described inverter and electrical network, described Anti-reflux controller controls the break-make of described relay.
8. photovoltaic system as claimed in claim 7, it is characterized in that, described Anti-reflux controller also connects a backstage host computer and a display unit.
9. photovoltaic system as claimed in claim 8, is characterized in that, the chip model that described Anti-reflux controller adopts is TMS320F28069.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108110796A (en) * | 2018-01-24 | 2018-06-01 | 胡炎申 | A kind of photovoltaic generating system of component polarity ground connection |
| CN108649830A (en) * | 2018-06-28 | 2018-10-12 | 北京汉能光伏投资有限公司 | A kind of high-frequency isolation inverter and solar power system |
| CN110768300A (en) * | 2019-12-11 | 2020-02-07 | 阳光电源股份有限公司 | Wind-solar hybrid power generation system |
| CN112583041A (en) * | 2019-09-27 | 2021-03-30 | 阳光电源股份有限公司 | Inverter, inversion system and control method |
| CN113098523A (en) * | 2021-03-25 | 2021-07-09 | 华中科技大学 | Digital delta-sigma control method, double-loop control method and high-precision alternating current source |
| CN116722590A (en) * | 2023-08-08 | 2023-09-08 | 锦浪科技股份有限公司 | PID effect inhibition method and system and photovoltaic system |
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| CN101197547A (en) * | 2006-12-06 | 2008-06-11 | 台达电子工业股份有限公司 | Three-phase synchronization AC generating circuit and its control method |
| CN102185533A (en) * | 2011-05-23 | 2011-09-14 | 北京交通大学 | Stored energy type standard-Z source photovoltaic power generation control system and method |
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| US20070236187A1 (en) * | 2006-04-07 | 2007-10-11 | Yuan Ze University | High-performance solar photovoltaic ( PV) energy conversion system |
| CN101197547A (en) * | 2006-12-06 | 2008-06-11 | 台达电子工业股份有限公司 | Three-phase synchronization AC generating circuit and its control method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108110796A (en) * | 2018-01-24 | 2018-06-01 | 胡炎申 | A kind of photovoltaic generating system of component polarity ground connection |
| CN108649830A (en) * | 2018-06-28 | 2018-10-12 | 北京汉能光伏投资有限公司 | A kind of high-frequency isolation inverter and solar power system |
| CN108649830B (en) * | 2018-06-28 | 2023-10-03 | 东君新能源有限公司 | High-frequency isolation inverter and solar power generation system |
| CN112583041A (en) * | 2019-09-27 | 2021-03-30 | 阳光电源股份有限公司 | Inverter, inversion system and control method |
| CN110768300A (en) * | 2019-12-11 | 2020-02-07 | 阳光电源股份有限公司 | Wind-solar hybrid power generation system |
| CN113098523A (en) * | 2021-03-25 | 2021-07-09 | 华中科技大学 | Digital delta-sigma control method, double-loop control method and high-precision alternating current source |
| CN116722590A (en) * | 2023-08-08 | 2023-09-08 | 锦浪科技股份有限公司 | PID effect inhibition method and system and photovoltaic system |
| CN116722590B (en) * | 2023-08-08 | 2023-12-05 | 锦浪科技股份有限公司 | PID effect inhibition method and system and photovoltaic system |
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