CN102435882A - Low-voltage ride through detection device of grid-connected photovoltaic converter of passive reactor structure - Google Patents
Low-voltage ride through detection device of grid-connected photovoltaic converter of passive reactor structure Download PDFInfo
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- CN102435882A CN102435882A CN2011102861317A CN201110286131A CN102435882A CN 102435882 A CN102435882 A CN 102435882A CN 2011102861317 A CN2011102861317 A CN 2011102861317A CN 201110286131 A CN201110286131 A CN 201110286131A CN 102435882 A CN102435882 A CN 102435882A
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Abstract
The invention relates to a low-voltage ride through detection device of a grid-connected photovoltaic converter of a passive reactor structure. The low-voltage ride through detection device is characterized in that an AC (alternating current) source input end is connected with a 10 kV utility grid; an isolation transformer is additionally arranged to prevent the influences of detection on the utility grid; one end of the low-voltage ride through detection device is connected with the isolation transformer, and the other end of the low-voltage ride through detection device is connected with a boosting transformer; an independent passive reactor is adopted in the low-voltage ride through detection device; and the device mainly consists of a current limiting reactor X1, a grounding reactor X2 and two circuit breakers S1 and S2. The technical scheme disclosed by the invention provides an another low-voltage ride through detection realization method, which can meet the requirement for low-voltage ride through detection of the existing grid-connected photovoltaic converters of all power levels and voltage levels in the market, for the grid-connected photovoltaic converter. By adopting the independent passive reactor, the method can be used for simulating the transient state process of the utility grid when a real fault occurs, and has the advantages of high test response speed and lower cost.
Description
Technical field
The present invention relates to photovoltaic generation and insert electric power network technique, is a kind ofly to pass through pick-up unit through the low-voltage that adopts the grid-connected photovoltaic inverter that the passive reactance device realizes.
Background technology
Traditional low-voltage is passed through pick-up unit, realizes that through adopting the ac-dc-ac inverter device device mainly is made up of transformer, ac-dc-ac inverter device.The inner transformer of device is used for changing the voltage differences between electrical network and the frequency converter, and the subsidiary simultaneously effect with filtering is avoided frequency converter that electrical network is injected and polluted harmonic wave.Pass through when detecting test when carrying out low-voltage, only need a control of conversion device output voltage amplitude to drop into ratings and get final product.Because frequency converter has closed-loop control, so pick-up unit can be accomplished accurately to regulate and the simulation recovery curve.
Use the ac-dc-ac inverter device to carry out low-voltage when passing through, the net side converter adopts voltage vector control, in the power factor that guarantees to flow is under 1 the prerequisite, to guarantee that dc voltage is a steady state value; The control strategy of inverter side adopts voltage close loop control, and the phase voltage sampled value is input in the controller, through control output required voltage amplitude, generates the PWM ripple, thus the control inverter output voltage amplitude.
Low-voltage through adopting the ac-dc-ac inverter device to realize is passed through pick-up unit, no matter is to adopt the high voltage frequency converter of the little electric current of high voltage or the low-voltage variable frequency device of low-voltage and high-current, and cost is all than higher; Because adopt voltage close loop control, therefore the response speed of device is slower.
The photovoltaic combining inverter low-voltage is passed through and is meant that in the electric voltage dropping scope, photovoltaic DC-to-AC converter can continue to be incorporated into the power networks when utility network fault or disturbance cause the electric voltage dropping of photovoltaic electric station grid connection point.Low voltage ride-through capability directly plays the effect of supporting the continual and steady operation of utility network as a kind of strategy of high capacity photovoltaic system reply utility network fault or disturbance.Grid-connected transmission lines of electricity that are applied to below the 110kV of following China more, the operation of power networks environment is very complicated, capacity great disparity between grid-connected photovoltaic system and the utility network in addition, low-voltage pass through detect imperative.Be the grid-connected market order of standard; For promoting the flourish situation of photovoltaic generation; Strive for that photovoltaic generation inserts the initiative of electrical network; Guaranteeing that photovoltaic system is safe and reliable is incorporated into the power networks, look for one safely and efficiently high capacity grid-connected photovoltaic inverter low-voltage to pass through the detection approach imperative, and have broad application prospects.
Summary of the invention
The purpose of patent of the present invention is that a kind of low-voltage of the grid-connected photovoltaic inverter of various power grades, electric pressure that is applicable to of realization is passed through the detection core apparatus; Independently passive reactance device is adopted in this device inside, can satisfy the low-voltage of all kinds of grid-connected photovoltaic inverters is passed through the detection demand.
For realizing above-mentioned purpose, the present invention adopts following technical scheme, and passive reactance device structure grid-connected photovoltaic inverter low-voltage is passed through pick-up unit; It is characterized in that; The alternating current source input end connects the 10kV utility network, in order to prevent to detect utility network is exerted an influence, and increases isolating transformer; Low-voltage is passed through pick-up unit one end and is connected to isolating transformer, and the other end is connected to step-up transformer; Low-voltage is passed through pick-up unit inside and is adopted independently passive reactance device, and device is mainly by X
1Current limiting reactor, X
2Earthing reactor, isolating switch S
1And S
2Form.
Isolating switch S before the experiment beginning
1Closure, S
2Break off the stable normal operation of photovoltaic DC-to-AC converter; During the experiment beginning, break off S
1, closed S
2, simulation electrical network electric voltage dropping.In order accurately to simulate the electrical network electric voltage dropping, need rationally choose X
1And X
2Reactance value.X
1And X
2The selection of reactance value receives the restriction of many factors, analyzes according to the principle topological diagram of Fig. 2, and be reactor X with isolating transformer, the equivalence of step-up transformer difference
T, X
3, the utility network equivalence is that ideal voltage source, photovoltaic DC-to-AC converter equivalence are ideal current source.
The circuit of mutual superposition again after major loop is equivalent to ideal voltage source and current source and acts on respectively, because that photovoltaic DC-to-AC converter is only sent out pure is meritorious, so utility network and photovoltaic DC-to-AC converter are at reactor X
290 ° of last dividing potential drop phase differential, then electric voltage dropping point voltage computing formula is following:
Can find out that from following formula because tested grid-connected photovoltaic inverter capacity is uncertain, in order to reduce falling influence a little, the reactance value that must reduce the passive reactance device is at utmost to reduce the influence of photovoltaic DC-to-AC converter electric current to the drop-off voltage degree of depth; But after dwindling reactance value, will increase passive inductance from the electrical network absorbing reactive power, and consider that the isolating transformer outlet side will have capacity limit, the value of passive reactance device can not infinitely be dwindled; Low-voltage is passed through test and is not required the equipment long-play, because transformer has the function that overload is in short-term carried out, and generally 2 ~ 3 times of the desirable isolating transformer outlet side of the minimum value capacity of passive reactance device, as shown in the formula:
Low-voltage is passed through pick-up unit and is had following two functions:
1) electric voltage dropping in the time of can simulating electric network fault or disturbance and voltage recover;
2) energy feeding that the grid-connected photovoltaic inverter is sent is gone into utility network.
The present invention program's enforcement; For providing another kind of low-voltage, the grid-connected photovoltaic inverter passes through the implementation method of detection; This method is through adopting the passive reactance device, can satisfy in the market the grid-connected photovoltaic inverter low-voltage of all power grades, electric pressure equally and pass through the detection demand.With traditional to pass through to adopt the ac-dc-ac inverter device to realize that low-voltage is passed through the method for detection different; The low-voltage that the present invention proposes is passed through pick-up unit; Through adopting independently passive reactance device; Can simulate the transient state process of utility network when truly breaking down, test response speed is fast, and cost is relatively low.
Description of drawings
Fig. 1: the grid-connected photovoltaic inverter low-voltage of generally using is at present passed through the pick-up unit block diagram.
Fig. 2: the grid-connected photovoltaic inverter low-voltage that the present invention proposes is passed through the pick-up unit block diagram.
Fig. 3: low-voltage is passed through pick-up unit major loop equivalent electrical circuit.
Embodiment
The photovoltaic combining inverter low-voltage is passed through pick-up unit, is used to test whether inverter has the low voltage ride-through capability that conformance with standard requires under electric network fault or the state of disturbance, when detecting test,
(1) low-voltage is passed through the pick-up unit series connection between isolating transformer and step-up transformer, another termination utility network of isolating transformer, another termination grid-connected photovoltaic inverter output end of step-up transformer, inverter input termination controllable direct current power supply;
(2) start low-voltage and pass through pick-up unit, regulating device internal simulation electrical network exports the invertor operation scope to;
(3) start controllable direct current power supply, selecting the direct supply mode of operation is constant current, constant voltage or MPPT;
(4) start inverter, wait for the operation of inverter normal and stable;
(5) the electric voltage dropping parameter that low-voltage is passed through pick-up unit internal simulation electrical network is set, test inverter low-voltage is passed through function.
Claims (2)
1. passive reactance device structure grid-connected photovoltaic inverter low-voltage is passed through pick-up unit, it is characterized in that, adopts independently passive reactance device, and device comprises current limiting reactor X
1, earthing reactor X
2, isolating switch S
1And S
2, isolating switch S before the experiment beginning
1Closure, S
2Break off the stable normal operation of photovoltaic DC-to-AC converter; During the experiment beginning, break off S
1, closed S
2, simulation electrical network electric voltage dropping.
2. passive reactance device structure grid-connected photovoltaic inverter low-voltage according to claim 2 is passed through pick-up unit, it is characterized in that, and be reactor X with isolating transformer, the equivalence of step-up transformer difference
T, X
3, the utility network equivalence is that ideal voltage source, photovoltaic DC-to-AC converter equivalence are ideal current source, chooses current limiting reactor X
1With earthing reactor X
2Reactance value.
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| CN2011102861317A CN102435882B (en) | 2011-09-24 | 2011-09-24 | Low-voltage ride through detection device of grid-connected photovoltaic converter of passive reactor structure |
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Cited By (10)
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|---|---|---|---|---|
| CN102684225A (en) * | 2012-05-25 | 2012-09-19 | 武汉大学 | Controllable electric reactor based low-voltage ride through system and test method thereof |
| CN102721883A (en) * | 2012-06-15 | 2012-10-10 | 中国电力科学研究院 | Detecting device for low voltage ride-through of grid-connected photovoltaic inverter |
| CN103944507A (en) * | 2014-02-18 | 2014-07-23 | 国家电网公司 | Photovoltaic-power-station low-voltage penetrating performance evaluation method based on inverter model test |
| CN104124916A (en) * | 2014-06-30 | 2014-10-29 | 国网青海省电力公司电力科学研究院 | Power grid fault simulation test system movement detection device for high-altitude photovoltaic power station |
| CN104184410A (en) * | 2014-06-30 | 2014-12-03 | 国网青海省电力公司电力科学研究院 | Mobile detection device for high-altitude photovoltaic power station power grid disturbance simulation test system |
| CN104345222A (en) * | 2013-07-29 | 2015-02-11 | 青岛菲特电器科技有限公司 | Low-voltage ride through system |
| CN105425171A (en) * | 2015-12-18 | 2016-03-23 | 南京南瑞继保电气有限公司 | Method for detecting voltage drop of low voltage ride-through power source of frequency converter |
| CN106772114A (en) * | 2015-11-18 | 2017-05-31 | 中国电力科学研究院 | A kind of multiple access voltage class method of testing of low-voltage ride-through detection equipment |
| CN110672938A (en) * | 2019-09-19 | 2020-01-10 | 南方电网科学研究院有限责任公司 | Method and system for testing low voltage ride through characteristics of photovoltaic inverter and storage medium |
| CN116565963A (en) * | 2023-07-12 | 2023-08-08 | 西安高压电器研究院股份有限公司 | Distributed photovoltaic grid-connected system and low-voltage treatment method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684225A (en) * | 2012-05-25 | 2012-09-19 | 武汉大学 | Controllable electric reactor based low-voltage ride through system and test method thereof |
| CN102721883A (en) * | 2012-06-15 | 2012-10-10 | 中国电力科学研究院 | Detecting device for low voltage ride-through of grid-connected photovoltaic inverter |
| WO2013185455A1 (en) * | 2012-06-15 | 2013-12-19 | 中国电力科学研究院 | Low voltage ride through detection device for grid-connected photovoltaic inverter |
| CN102721883B (en) * | 2012-06-15 | 2016-02-24 | 中国电力科学研究院 | A kind of low voltage crossing pick-up unit of grid-connected photovoltaic inverter |
| CN104345222A (en) * | 2013-07-29 | 2015-02-11 | 青岛菲特电器科技有限公司 | Low-voltage ride through system |
| CN103944507A (en) * | 2014-02-18 | 2014-07-23 | 国家电网公司 | Photovoltaic-power-station low-voltage penetrating performance evaluation method based on inverter model test |
| CN103944507B (en) * | 2014-02-18 | 2017-01-11 | 国家电网公司 | Photovoltaic-power-station low-voltage penetrating performance evaluation method based on inverter model test |
| CN104184410A (en) * | 2014-06-30 | 2014-12-03 | 国网青海省电力公司电力科学研究院 | Mobile detection device for high-altitude photovoltaic power station power grid disturbance simulation test system |
| CN104124916A (en) * | 2014-06-30 | 2014-10-29 | 国网青海省电力公司电力科学研究院 | Power grid fault simulation test system movement detection device for high-altitude photovoltaic power station |
| CN106772114A (en) * | 2015-11-18 | 2017-05-31 | 中国电力科学研究院 | A kind of multiple access voltage class method of testing of low-voltage ride-through detection equipment |
| CN105425171A (en) * | 2015-12-18 | 2016-03-23 | 南京南瑞继保电气有限公司 | Method for detecting voltage drop of low voltage ride-through power source of frequency converter |
| CN110672938A (en) * | 2019-09-19 | 2020-01-10 | 南方电网科学研究院有限责任公司 | Method and system for testing low voltage ride through characteristics of photovoltaic inverter and storage medium |
| CN116565963A (en) * | 2023-07-12 | 2023-08-08 | 西安高压电器研究院股份有限公司 | Distributed photovoltaic grid-connected system and low-voltage treatment method |
| CN116565963B (en) * | 2023-07-12 | 2023-10-10 | 西安高压电器研究院股份有限公司 | Distributed photovoltaic grid-connected system and low-voltage treatment method |
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