CN103986192B - A kind of non-isolated photovoltaic grid-connected inverter and grid-connected photovoltaic system - Google Patents
A kind of non-isolated photovoltaic grid-connected inverter and grid-connected photovoltaic system Download PDFInfo
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- CN103986192B CN103986192B CN201410232024.XA CN201410232024A CN103986192B CN 103986192 B CN103986192 B CN 103986192B CN 201410232024 A CN201410232024 A CN 201410232024A CN 103986192 B CN103986192 B CN 103986192B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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Abstract
The embodiment of the invention discloses a kind of non-isolated photovoltaic grid-connected inverter, comprising: inversion unit; Be positioned at the leakage current sensor of the AC of described inversion unit; Connect the control module of described inversion unit and described leakage current sensor; The DC side of non-isolated photovoltaic grid-connected inverter described in one termination, the other end pass the passive device of ground connection after described leakage current sensor by wire, this passive device comprises equivalent resistance; And the gate-controlled switch being in series with described passive device, the control signal input of described gate-controlled switch connects described control module, to ensure that non-isolated photovoltaic grid-connected inverter still possesses leakage current troubleshooting capability in the situation that exchanging side joint isolating transformer. In addition, the invention also discloses a kind of isolated form grid-connected photovoltaic system.
Description
Technical field
The present invention relates to photovoltaic power generation technology field, more particularly, relate to a kind of non-isolation type photovoltaic alsoNet inverter and a kind of grid-connected photovoltaic system.
Background technology
Referring to Fig. 1 a, non-isolated photovoltaic grid-connected inverter is the energy conversion device of photovoltaic generating system,For sending into electrical network after the converting direct-current power into alternating-current power that photovoltaic module PV is produced. The composition of this inverterParts at least comprise inversion unit 10, control module 20 and leakage current sensor 30; When inversion unit 10DC side shorted to earth or impedance hour, can produce very large leakage current between DC side and the earth, andFlow to the AC of inversion unit 10, and the effect of control module 20 is just when leakage current sensing being detectedWhen the size of the measured leakage current of device 30 exceeds preset value, control inverter carries out troubleshooting and (comprisesThe switching tube of controlling in inversion unit 10 disconnects).
But, (ginseng in the time of the interchange side joint isolating transformer 40 of described non-isolated photovoltaic grid-connected inverterSee Fig. 1 b), leakage current can not flow to AC, is positioned at so the leakage current sensor 30 of AC yetJust cannot measure the size of leakage current, cause described non-isolated photovoltaic grid-connected inverter to lose leakage current, very easily there is shock hazard in troubleshooting capability.
Summary of the invention
In view of this, the invention provides a kind of non-isolated photovoltaic grid-connected inverter and a kind of isolated form photovoltaicGrid-connected system, to ensure that non-isolated photovoltaic grid-connected inverter is in the feelings that exchange side joint isolating transformerUnder condition, still possesses leakage current troubleshooting capability.
A kind of non-isolated photovoltaic grid-connected inverter, comprises inversion unit, is positioned at the friendship of described inversion unitFlow the leakage current sensor of side, and connect the control list of described inversion unit and described leakage current sensorUnit, comprises in addition: described in a termination, the DC side of non-isolated photovoltaic grid-connected inverter, the other end lead toCross the passive device of wire through ground connection after described leakage current sensor, this passive device comprises equivalent resistance;And the gate-controlled switch being in series with described passive device, the control signal input of described gate-controlled switch connectsConnect described control module.
Wherein, described gate-controlled switch comprises: crystal controlled tr tube, isolation gate-controlled switch or relay.
Alternatively, described non-isolated photovoltaic grid-connected inverter also comprises: be in series with described passive deviceDiode.
Wherein, when described non-isolated photovoltaic grid-connected inverter is for requiring negative pole there is no over the ground high strength negative electricityPress inverter time, the anode of described diode connects described leakage current sensor, negative electrode through described passiveDevice accesses the negative pole of described non-isolated photovoltaic grid-connected inverter.
Wherein, when described non-isolated photovoltaic grid-connected inverter is for requiring positive pole there is no over the ground high strength positive electricityPress inverter time, the negative electrode of described diode connects described leakage current sensor, anode through described passiveDevice accesses the positive pole of described non-isolated photovoltaic grid-connected inverter.
Wherein, the DC side of described non-isolated photovoltaic grid-connected inverter comprises: described inversion unit straightStream side or dc bus.
A kind of isolated form grid-connected photovoltaic system, comprising: photovoltaic module, above-mentioned any non-isolation typePhotovoltaic combining inverter, and the isolation of connection electrical network and non-isolated photovoltaic grid-connected inverter described in eachTransformer.
Can find out from above-mentioned technical scheme, the present invention is by grid-connected contrary at existing non-isolation typeBecome in device and introduce passive device and gate-controlled switch, the DC side of described passive device one this inverter of termination,Ground connection after leakage current sensor is passed by wire in one end, and described gate-controlled switch connects control module, and with instituteState passive device series connection; Thereby, in the time of described inverter access isolating transformer, only need to make described controlledSwitch is open-minded, and the leakage current that inverter direct-flow side can be produced directly imports to described leakage current sensorIn detect, thereby make the described control module can be according to the testing result control of leakage current sensorInverter carries out leakage current troubleshooting, avoids occurring shock hazard.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be to realityThe accompanying drawing of executing required use in example or description of the Prior Art is briefly described, apparently, belowAccompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art,Do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 a is the disclosed a kind of grid-connected photovoltaic system structural representation of prior art;
Fig. 1 b is disclosed another the grid-connected photovoltaic system structural representation of prior art;
Fig. 2 is the disclosed a kind of non-isolated photovoltaic grid-connected inverter structural representation of the embodiment of the present invention one;
Fig. 3 a-3b is that the disclosed a kind of non-isolated photovoltaic grid-connected inverter structure of the embodiment of the present invention two is shownIntention;
Fig. 4 is disclosed another the non-isolated photovoltaic grid-connected inverter structural representation of the embodiment of the present invention twoFigure;
Fig. 5 is the disclosed a kind of isolated form grid-connected photovoltaic system structural representation of the embodiment of the present invention three.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried outDescribe clearly and completely, obviously, described embodiment is only the present invention's part embodiment, andNot whole embodiment. Based on the embodiment in the present invention, those of ordinary skill in the art are not doingGo out the every other embodiment obtaining under creative work prerequisite, all belong to the scope of protection of the invention.
Embodiment mono-:
Referring to Fig. 2, the embodiment of the present invention one discloses a kind of non-isolated photovoltaic grid-connected inverter, to ensureNon-isolated photovoltaic grid-connected inverter still possesses leakage current fault in the situation that exchanging side joint isolating transformerDisposal ability, comprises inversion unit 10, control module 20, leakage current sensor 30, passive device 40With gate-controlled switch K, wherein:
Leakage current sensor 30 is positioned at the AC of inversion unit 10; Control module 20 connects respectively inversionUnit 10 and leakage current sensor 30;
Described in one termination of passive device 40, the DC side of non-isolated photovoltaic grid-connected inverter, the other end lead toCross wire through the rear ground connection of leakage current sensor 30, this passive device 40 comprises equivalent resistance;
Gate-controlled switch K and passive device 40 are in series, and the control signal input of gate-controlled switch K connectsControl module 20 (its annexation does not illustrate at Fig. 2).
About the present embodiment, wherein have it should be noted that (grid-connected hereinafter to be referred as non-isolation type at 5DC side and the AC of inverter is respectively " A side " and " B side ", is called for short the positive and negative of " A side "The utmost point is respectively PV+And PV-)：
1) preferably 5K Ω～100K Ω of the resistance of the passive device 40 described in the present embodiment size, its circuitStructure can be a resistance, can be also connection in series-parallel combination of multiple resistance etc., does not limit to.
2) wire through the direction of leakage current sensor 30 and mode (as individual pen is walked mode or multi-turn is wornLine mode) do not limit to.
3) gate-controlled switch K can adopt crystal controlled tr tube, isolation gate-controlled switch or relay etc.
4) DC side of described non-isolated photovoltaic grid-connected inverter comprises: the DC side of inversion unit 10Or dc bus, the DC side that Fig. 2 is only connected to inversion unit 10 using passive device 40 is as example;Wherein, described non-isolated photovoltaic grid-connected inverter also comprises the DC side that is arranged at inversion unit 10 conventionallyBooster circuit, the outlet of described booster circuit is described dc bus.
5) passive device 40 can be PV with the tie point of " A side "+, can be also PV-；
With PV-Non-isolated photovoltaic grid-connected inverter as tie point requires negative pole and the earth for couplingBetween there is no the photovoltaic module of high strength negative voltage, this non-isolated photovoltaic grid-connected inverter is for requiring PV-WithBetween the earth, there is no the inverter of high strength negative voltage, hereinafter to be referred as 1 class inverter;
With PV+Be used for mating requirement positive pole and the earth as the non-isolated photovoltaic grid-connected inverter of tie pointBetween there is no the photovoltaic module of high strength positive voltage, this non-isolated photovoltaic grid-connected inverter is for requiring PV+WithBetween the earth, there is no the inverter of high strength positive voltage, hereinafter to be referred as 2 class inverters.
Below, the defect existing by analyzing existing non-isolated photovoltaic grid-connected inverter, to this enforcementThe superiority of the described scheme of example describes in detail.
First, for existing non-isolated photovoltaic grid-connected inverter, when " B side " do not connect isolating transformerTime, " A side " has direct electrical connection with electrical network, and the leakage current that " A side " produces can flow to " BSide ", directly measured by the leakage current sensor 30 that is positioned at " B side ". And introducing isolating transformerAfter, owing to there is electrical isolation between " A side " and electrical network, therefore leakage current cannot flow to from " A side " again" B side ", causes leakage current sensor 30 and control module 20 idle, non-isolation type photovoltaic grid-connected inversionDevice loses leakage current troubleshooting capability, is easy to occur if operating personnel now touch " A side " accidentallyShock hazard.
And for the non-isolated photovoltaic grid-connected inverter described in the present embodiment, no matter in photovoltaic generating systemWhether introduce isolating transformer, can both, in the situation that needn't additionally increasing leakage current sensor, realizeDetection to leakage current and troubleshooting. Its operation principle is as follows:
Disconnect when B side does not meet isolating transformer season gate-controlled switch K, now described in the present embodiment non-everyRelease photovoltaic combining inverter is consistent with the operation principle of existing non-isolated photovoltaic grid-connected inverter;
When B side joint isolating transformer, gate-controlled switch K in season is open-minded, because passive device 40 one end are switched to ASide, the other end are passed after leakage current sensor 30 ground connection again, the leakage current energy that therefore A side produces by wireEnough flow directly into leakage current sensor 30, realize the detection to leakage current;
The superiority of explanation the present embodiment aspect leakage current troubleshooting as an example of 1 class inverter example below. WhenMinimum (the i.e. PV of 1 class inverter of A side shorted to earth or earth impedance of 1 class inverter+Shorted to earth orPV+Earth impedance is minimum) time, PV-And PV+Earth impedance all very little, PV-And PV+All have higherVoltage-to-ground and can export very large leakage current, leakage current sensor 30 can detect very large leakage currentAnd measurement result is delivered to control module 20, now control module 20 just can exceed in described measurement result in advanceIf carry out leakage current troubleshooting when value, thereby avoid occurring shock hazard. Wherein compared to prior art,Leakage current troubleshooting described in the present embodiment also comprises: control gate-controlled switch K and disconnect.
That is to say, no matter whether " B side " connects isolating transformer, only need by controlling gate-controlled switch K'sTurn on and off, the leakage current that just " A side " can be produced informs leakage current sensor 30, controls soUnit 20 just can be in the time that the measured value that leakage current sensor 30 detected exceeds preset value, control described non-everyRelease photovoltaic combining inverter carries out leakage current troubleshooting, thereby avoids occurring shock hazard, has solvedThe problem that prior art exists.
In addition,, in the situation that gate-controlled switch K opens, the non-isolation type photovoltaic described in the present embodiment alsoNet inverter can also suppress PID (potentialInducedDegradation, potential electromotive force induction decay)Effect, is analyzed as follows:
PID effect, refers to when photovoltaic module is worked under the high voltage condition of particular polarity its performance levelThe phenomenon significantly reducing; When passive device 40 is PV with the tie point of A side-Time, PV-Earth impedanceMuch smaller than PV+Earth impedance, thereby PV-Voltage-to-ground very little, so just avoided PV-With the earthBetween there is high voltage and the PID effect that causes; In like manner, when passive device 40 and the tie point of A side arePV+Time, can avoid because of PV equally+And the PID effect that has high voltage between the earth and cause.
Can be found out by foregoing description, based on the non-isolated photovoltaic grid-connected inverter described in the present embodiment one,Only need to control turning on and off of gate-controlled switch K, the leakage current that can make " A side " to produce informs electric leakageFlow sensor 30, thus realize detection and the troubleshooting to leakage current; In addition, open-minded at gate-controlled switch KSituation under, this inverter can also effectively suppress PID effect.
Embodiment bis-:
For the electric current of the passive device 40 place branch roads that reduce to flow through, the present embodiment two disclosed another non-everyRelease photovoltaic combining inverter also comprises the diode being in series with passive device 40. This diode is in inversionConducting direction in device is by the type decided of inverter. Make a concrete analysis of as follows:
Referring to Fig. 3 a, the present embodiment two is based on the disclosed non-isolated photovoltaic grid-connected inverter of 1 class inverterComprise: inversion unit 10, control module 20, leakage current sensor 30, passive device 40, controlled openingClose K, and anode connects leakage current sensor 30, negative electrode accesses described non-isolation type through passive device 40The diode D of the negative pole of photovoltaic combining inverter.
In the time that needs connect isolating transformer, only need to make gate-controlled switch K open-minded, now, described non-isolation typeThe negative pole of photovoltaic combining inverter can remain does not have high-intensity back bias voltage over the ground, this negative pole and the earthBetween effectively suppressed PID effect because not existing compared with high back bias voltage.
In addition, the non-isolated photovoltaic grid-connected inverter shown in Fig. 3 a (or Fig. 2) not only can isolated operation,Also can many parallel connections be applied in photovoltaic generating system, (comprise contrary with 2 inverters that have shown in Fig. 3 bBecome device 1 and inverter 2) photovoltaic generating system into example (for ease of describing, definition gate-controlled switch K, two utmost pointsThe branch road at pipe D and passive device 40 places is that PID suppresses branch road) analyze:
If the PV of inverter 1 " A side "+Shorted to earth or earth impedance are minimum, from PV+Flow to the earthThe PID that an electric current part flows through inverter 1 suppresses branch road, and the PID that another part flows through inverter 2 suppresses to prop upRoad. Simultaneously can be because parallel connection output produces circulation between inverter 1 and inverter 2; In inverter 1, flow throughIt is identical with the direction of described circulation that PID suppresses the electric current of branch road, thereby can mutually strengthen leakage current sensorLarger current value can be detected, in the time that this current value is greater than preset value, inverter 1 carries out leakage current fault placeReason; And in inverter 2, flowing through PID suppresses the electric current of branch road and the opposite direction of described circulation, therebyCan cancel out each other, current value that leakage current sensor detects is less is not enough to reach preset value, inverter 2Do not carry out leakage current troubleshooting. So just guarantee, in the time that 1 inverter breaks down, only to break downInverter carry out leakage current troubleshooting, and the inverter that other do not break down is still normally incorporated into the power networks.
Referring to Fig. 4, the present embodiment two is based on the disclosed non-isolated photovoltaic grid-connected inverter bag of 2 class inverterDraw together: inversion unit 10, control module 20, leakage current sensor 30, passive device 40, and negative electrodeConnect leakage current sensor 30, anode and access described non-isolated photovoltaic grid-connected inverter through passive device 40Anodal diode D.
In like manner, in the time that this inverter connects isolating transformer, only need to make gate-controlled switch K open-minded, now this is contraryBetween the positive pole of change device and the earth, effectively suppress PID effect because not existing compared with high positive bias; And shouldInverter both can isolated operation, can many parallel connections be applied in photovoltaic generating system again.
In addition,, for playing a protective role, also can be above-mentioned disclosed any non-isolation type grid-connected contraryBecome device and introduce the fuse being in series with passive device.
Embodiment tri-
Referring to Fig. 5, the embodiment of the present invention three discloses a kind of isolated form grid-connected photovoltaic system, comprising:Photovoltaic module 1, above-mentioned any non-isolated photovoltaic grid-connected inverter 2, and connect electrical network and each instituteState the isolating transformer 3 of non-isolated photovoltaic grid-connected inverter. Wherein, the quantity of photovoltaic module 1 is (non-The quantity of isolated form photovoltaic combining inverter 2) do not limit to.
In sum, the present invention by introducing passive device in existing non-isolated photovoltaic grid-connected inverterPart and gate-controlled switch, DC side, one end of described passive device one this inverter of termination are passed by wireGround connection after leakage current sensor, described gate-controlled switch connects control module, and connects with described passive device;Thereby, in the time of described inverter access isolating transformer, only need to make described gate-controlled switch open-minded, can be byThe leakage current that inverter direct-flow side produces directly imports in described leakage current sensor and detects, therebyMake described control module to carry out leakage current according to the testing result control inverter of leakage current sensorTroubleshooting, avoids occurring shock hazard.
In this description, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stressesBe and the difference of other embodiment, between each embodiment identical similar part mutually referring to.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field can be realized or useThe present invention. To be aobvious and easy for those skilled in the art to the multiple amendment of these embodimentSee, General Principle as defined herein can not depart from the spirit or scope of the embodiment of the present inventionIn situation, realize in other embodiments. Therefore, the embodiment of the present invention will can not be restricted to institute hereinThese embodiment that show, but to meet consistent with principle disclosed herein and features of novelty the widestScope.
Claims (7)
1. a non-isolated photovoltaic grid-connected inverter, comprises inversion unit, is positioned at described inversion unitThe leakage current sensor of AC, and connect the control of described inversion unit and described leakage current sensorUnit, is characterized in that, described non-isolated photovoltaic grid-connected inverter is common to grid-connected of isolated formElectric system and non-isolation type grid-connected photovoltaic system, described non-isolated photovoltaic grid-connected inverter also comprises:
Described in one termination, the DC side of non-isolated photovoltaic grid-connected inverter, the other end pass institute by wireThe passive device of stating ground connection after leakage current sensor, this passive device comprises equivalent resistance;
And the gate-controlled switch being in series with described passive device, the control signal input of described gate-controlled switchEnd connects described control module.
2. non-isolated photovoltaic grid-connected inverter according to claim 1, is characterized in that, described inGate-controlled switch comprises: crystal controlled tr tube, isolation gate-controlled switch or relay.
3. non-isolated photovoltaic grid-connected inverter according to claim 1, is characterized in that, also bagDraw together: the diode being in series with described passive device.
4. non-isolated photovoltaic grid-connected inverter according to claim 3, is characterized in that, works as instituteWhen stating non-isolated photovoltaic grid-connected inverter and be requirement negative pole and thering is no over the ground the inverter of high strength negative voltage,The anode of described diode connects described leakage current sensor, negative electrode is described non-through described passive device accessThe negative pole of isolated form photovoltaic combining inverter.
5. non-isolated photovoltaic grid-connected inverter according to claim 3, is characterized in that, works as instituteWhen stating non-isolated photovoltaic grid-connected inverter and be requirement positive pole and thering is no over the ground the inverter of high strength positive voltage,The negative electrode of described diode connects described leakage current sensor, anode is described non-through described passive device accessThe positive pole of isolated form photovoltaic combining inverter.
6. non-isolated photovoltaic grid-connected inverter according to claim 1, is characterized in that, described inThe DC side of non-isolated photovoltaic grid-connected inverter comprises: the DC side of described inversion unit or dc bus.
7. an isolated form grid-connected photovoltaic system, is characterized in that, comprising: photovoltaic module, rightRequire the non-isolated photovoltaic grid-connected inverter described in any one in 1-6, and connect electrical network with described in eachThe isolating transformer of non-isolated photovoltaic grid-connected inverter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410232024.XA CN103986192B (en) | 2014-05-28 | 2014-05-28 | A kind of non-isolated photovoltaic grid-connected inverter and grid-connected photovoltaic system |
| PCT/CN2015/079801 WO2015180623A1 (en) | 2014-05-28 | 2015-05-26 | Non-isolated photovoltaic grid-connected inverter and photovoltaic grid-connected power generation system |
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| CN201410232024.XA CN103986192B (en) | 2014-05-28 | 2014-05-28 | A kind of non-isolated photovoltaic grid-connected inverter and grid-connected photovoltaic system |
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| CN103944502B (en) * | 2014-05-09 | 2016-05-25 | 阳光电源股份有限公司 | Anti-potential electromotive force induction attenuate light photovoltaic generating system, photovoltaic module and inverter |
| CN103986192B (en) * | 2014-05-28 | 2016-05-25 | 阳光电源股份有限公司 | A kind of non-isolated photovoltaic grid-connected inverter and grid-connected photovoltaic system |
| CN106786750B (en) * | 2016-12-27 | 2019-08-13 | 阳光电源股份有限公司 | Photovoltaic parallel in system and photovoltaic combining inverter |
| CN106899036B (en) * | 2017-03-16 | 2024-03-12 | 特变电工西安电气科技有限公司 | Photovoltaic power generation system capable of preventing potential induced attenuation |
| CN108964496B (en) * | 2017-05-19 | 2021-06-25 | 丰郅(上海)新能源科技有限公司 | Power generation system and improvement method for improving component attenuation caused by potential induced attenuation |
| CN107492907B (en) * | 2017-08-29 | 2024-04-12 | 武汉协鑫新能源电力设计有限公司 | Control device with PID (proportion integration differentiation) inhibition and restoration functions and control method thereof |
| CN109188167B (en) * | 2018-08-28 | 2021-09-24 | 科华数据股份有限公司 | Ground fault detection device and method |
| CN109188166B (en) * | 2018-08-28 | 2021-09-24 | 科华恒盛股份有限公司 | Ground fault detection device and method |
| CN112583041B (en) * | 2019-09-27 | 2023-06-30 | 阳光电源股份有限公司 | Inverter, inverter system and control method |
| CN111505381A (en) * | 2020-05-12 | 2020-08-07 | 爱士惟新能源技术(江苏)有限公司 | Insulation impedance detection circuit and method for non-isolated photovoltaic inverter |
| CN112072699B (en) * | 2020-09-03 | 2023-08-01 | 深圳市禾望科技有限公司 | Photovoltaic inverter and control method thereof |
| CN113156210B (en) * | 2021-03-12 | 2022-11-15 | 阳光电源股份有限公司 | Insulation detection method and application device thereof |
| CN113138326B (en) * | 2021-05-12 | 2024-05-14 | 阳光电源股份有限公司 | Insulation detection system, insulation detection method and photovoltaic system |
| CN113328463B (en) * | 2021-07-09 | 2024-08-13 | 阳光电源股份有限公司 | Photovoltaic inverter system and insulation fault detection method thereof |
| CN113687128B (en) * | 2021-09-08 | 2024-05-14 | 阳光电源股份有限公司 | Current detection method, device and equipment of photovoltaic PID (proportion integration differentiation) suppression circuit |
| CN113872241A (en) * | 2021-10-20 | 2021-12-31 | 固德威技术股份有限公司 | Grid-connected inverter system for preventing photovoltaic assembly potential induced attenuation |
| CN115567000B (en) * | 2022-12-06 | 2023-06-23 | 锦浪科技股份有限公司 | Method for detecting ground insulation resistance of modularized multi-level photovoltaic system |
| CN117129910B (en) * | 2023-10-27 | 2024-02-06 | 锦浪科技股份有限公司 | Open circuit detection method and system for photovoltaic inverter power device |
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| CN103986192A (en) | 2014-08-13 |
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