CN103227476A - Comprehensive test system for low voltage ride through or low voltage support - Google Patents
Comprehensive test system for low voltage ride through or low voltage support Download PDFInfo
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- CN103227476A CN103227476A CN201310092673XA CN201310092673A CN103227476A CN 103227476 A CN103227476 A CN 103227476A CN 201310092673X A CN201310092673X A CN 201310092673XA CN 201310092673 A CN201310092673 A CN 201310092673A CN 103227476 A CN103227476 A CN 103227476A
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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
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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
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses a comprehensive test system for low voltage ride through or low voltage support, and belongs to the test field of low voltage ride through or support in a high-power power electronic technology. The system is characterized in that a power grid low voltage generating device and a power grid low voltage support device are in series connection in front of a grid connection point of a new energy power generation system or another sensitive load (a load which is greatly affected by voltage fluctuation or temporary decrease) which needs to be subjected to the low voltage ride through test; the two devices are achieved according to a principle of a DVR (Dynamic Voltage Restorer), and adopt three-phase independent configuration; the three phases are not interfered mutually; and the three phases of the low voltage generating device and three phases of the low voltage support device are in corresponding series connection. The comprehensive test system disclosed by the invention is low in cost and wide in application range, and can perform effective test for the low voltage ride through and support.
Description
Technical field
The present invention relates to that a kind of low-voltage is passed through or low-voltage supports comprehensive test system, field tests is passed through or supported to the low-voltage that belongs in the high-power electric and electronic technology.
Background technology
Significant problem to be solved when the low-voltage crossing problem is wind power system, photovoltaic system and the operation of other sensitive loads, especially with the low-voltage crossing problem in the wind power system for very.At present, the means that solve wind power system low-voltage crossing problem mainly contain two kinds: the one, transform in blower fan inside, and increase the crowbar unit in blower fan current transformer inside, and control algolithm is improved; The 2nd, seal in compensation of power network voltage device (being the low-voltage fastening) at blower fan and site, when voltage took place by instantaneous falling, the dependence low-voltage compensation arrangement also voltage compensation of site got up.No matter adopt which kind of means, pilot system is tested all to need the more perfect low-voltage of a cover to pass through (or support), and wherein sixty-four dollar question is exactly how to adopt the less expensive effective method to carry out low-voltage under large-power occasions to simulate.
Traditional surface wind electric test system comprises that power supply unit (containing multiple-winding transformer etc.), gear unit (contain rectifier, motor etc., be used to simulate the blower fan input) and generator unit (contain double-fed or direct driving motor, double-fed or directly drive current transformer etc.), the pilot system of this traditional mode has been widely used in wind-powered electricity generation complete system plant or blower fan current transformer enterprise.But, existing surface wind electric test system, or do not possess low-voltage and pass through test function (as Chinese patent 200910262830.0), though or possess low-voltage and pass through test function, but the serious dependence on import of high-power electrical network low-voltage generation equipment costs an arm and a leg.In addition, the low-voltage that is incorporated into the power networks of photovoltaic DC-to-AC converter is passed through the high-power electrical network low-voltage generation equipment that test depends on import too, realizes that cost is higher.
Summary of the invention
The objective of the invention is to: propose that a kind of low-voltage based on dynamic electric voltage recovery device is passed through or low-voltage supports comprehensive test system, pass through or support the demand of test to satisfy wind-powered electricity generation, photovoltaic system or other sensitive loads low-voltages.
This low-voltage is passed through or low-voltage supports comprehensive test system and comprises and need do the equipment that low-voltage is passed through, seal in electrical network low-voltage generation equipment and electrical network low-voltage fastening before that do equipment that low-voltage passes through at described needs and the site, thereby constitute this comprehensive test system.
Further, described electrical network low-voltage generation equipment and electrical network low-voltage fastening all are to adopt the principle of dynamic electric voltage recovery device to realize; Described electrical network low-voltage generation equipment comprises the electrical network low-voltage generating unit of three-phase separate configurations, three-phase mutually noninterfere; Described electrical network low-voltage fastening comprises the electrical network low-voltage support unit of three-phase separate configurations, three-phase mutually noninterfere; Three phase network low-voltage generating unit and the corresponding serial connection of three phase network low-voltage support unit.
Further, described electrical network low-voltage generating unit is consistent with the structure of electrical network low-voltage support unit, all be to comprise single-phase H bridge inverter circuit, energy management unit, circuit breaker and power semiconductor switch, wherein: energy management unit is connected between the positive-negative input end of single-phase H bridge inverter circuit, circuit breaker and power semiconductor switch all are connected in parallel between the output of single-phase H bridge inverter circuit, and two outputs of single-phase H bridge inverter circuit are respectively as the input and the output of electrical network low-voltage generating unit or electrical network low-voltage support unit.
Technique effect:
1, adopt low-voltage generation equipment realization line voltage to fall simulation temporarily based on dynamic electric voltage recovery device (DVR), contrast the electrical network low-voltage generator of traditional employing band tap reactor, the degree of asymmetry of falling the degree of depth, time and falling all can be regulated continuously, and volume is littler relatively, cost is lower relatively, is well positioned to meet the demand that low-voltage is passed through test.
2, the mode that adopts electrical network low-voltage generation equipment and electrical network low-voltage fastening to be in series can satisfy low-voltage simultaneously and pass through the demand that supports test with low-voltage.
3, the low-voltage that can be applicable to wind power system, photovoltaic system and other sensitive loads (being subjected to voltage dip or voltage fluctuation to influence bigger load) is passed through or low-voltage support test, has wide range of applications.
Description of drawings
Fig. 1 is the topology diagram of single-phase electrical network low-voltage generating unit or single-phase electrical network low-voltage support unit, the number in the figure title: 1, single-phase electrical network low-voltage generation/support unit; 2, single-phase H bridge inverter circuit; 3, circuit breaker; 4, power semiconductor switch; 5, energy management unit; 6, inversion output filter unit.
Fig. 2 is the cascaded structure schematic diagram of electrical network low-voltage generation equipment and electrical network low-voltage fastening, and among the figure: 1a, 1b, 1c are the three-phase separate configurations of electrical network low-voltage generation equipment; 2a, 2b, 2c are the three-phase separate configurations of electrical network low-voltage fastening.
Fig. 3 is the overall structure schematic diagram that the present invention is based on double-fed type wind-powered electricity generation pilot system.
Embodiment
Below the invention will be further described.
Low-voltage of the present invention is passed through or the structure of low-voltage support comprehensive test system is to do wind power system, photovoltaic system or other sensitive loads (being subjected to voltage dip or voltage fluctuation to influence bigger load) that low-voltage is passed through based on needs, also seal in electrical network low-voltage generation equipment and electrical network low-voltage fastening before the site at it, thereby constitute this comprehensive test system.
All use the high-power electric and electronic circuit in electrical network low-voltage generation equipment and the electrical network low-voltage fastening, and be equipped with the dc capacitor of larger capacity.Electrical network low-voltage generation equipment adopts the principle of dynamic electric voltage recovery device (DVR) to simulate the generation that realizes low-voltage, and the principle of electrical network low-voltage fastening employing DVR realizes quick compensation and the support to electric voltage dropping.
The cascaded structure of electrical network low-voltage generation equipment and electrical network low-voltage fastening as shown in Figure 2, electrical network low-voltage generation equipment comprises electrical network low-voltage generating unit 1a, 1b, the 1c of three-phase separate configurations, three-phase mutually noninterfere; Electrical network low-voltage fastening comprises electrical network low- voltage support unit 2a, 2b, the 2c of three-phase separate configurations, three-phase mutually noninterfere.Three phase network low-voltage generating unit and the corresponding serial connection of three phase network low-voltage support unit, particularly, the three-phase input end of three phase network low-voltage generating unit inserts 690V or 400V electrical network by isolating transformer, three-phase output end docks with the three-phase input end of three phase network low-voltage support unit respectively, and the three-phase output end of three phase network low-voltage support unit inserts the also site for the treatment of testing equipment.
The topological structure of single-phase electrical network low-voltage generating unit or single-phase electrical network low-voltage support unit as shown in Figure 1, both structures are in full accord, all be to comprise single-phase H bridge inverter circuit 2, energy management unit 5, circuit breaker 3 and power semiconductor switch 4, wherein: energy management unit 5 provides the direct voltage input for single-phase H bridge inverter circuit 2, be positive bus-bar and the negative busbar that the two ends of energy management unit 5 connect dc capacitor in the single-phase H bridge inverter circuit 2 respectively, circuit breaker 3 and power semiconductor switch 4 all are connected in parallel between the output of single-phase H bridge inverter circuit 2.In single-phase electrical network low-voltage generating unit, an output of single-phase H bridge inverter circuit 2 inserts the corresponding phase of electrical network as the input of this unit, and another output is this phase low-voltage output; In single-phase electrical network low-voltage support unit, an output of single-phase H bridge inverter circuit 2 links to each other with the low-voltage output of the corresponding low-voltage of electrical network mutually generating unit as the input of this unit, another output is that this phase low-voltage supports output, with treat testing equipment corresponding also the site is continuous mutually.
Introduce the principle of two kinds of equipment of core among the present invention below.
(1) based on the electrical network low-voltage generation equipment of DVR:
Electrical network low-voltage generation equipment is according to the command value that voltage takes place (comprise fall amplitude, fall mutually and drop-out time etc.), by triggering the pulse of each device for power switching of inverter bridge, can regulate voltage takes place DVR size and duration, with obtain load voltage different fall the degree of depth and drop-out time.When low-voltage takes place, the dc capacitor continuous discharge of energy management unit side, therefore, electrical network low-voltage generation equipment need be equipped with the dc capacitor of larger capacity, needs the minimum appearance value size of outfit relevant with the maximum power of time and wind electric converter transmission with the depth capacity that voltage need fall.
(2) based on the electrical network low-voltage fastening of DVR:
Series connection electrical network low-voltage fastening is to realize one of method that the wind-powered electricity generation low-voltage is passed through before wind electric converter and site, is to keep the unit terminal voltage stable and to keep active power of output constant based on the major control target of the electrical network low-voltage fastening (abbreviating LVRT-DVR as) of DVR.Guarantee above 2 points, final goal is to pass through by increasing LVRT-DVR, make the unit realization low-voltage that does not possess low voltage ride-through capability fully.
In order to adapt to unbalanced fault, LVRT-DVR adopts the phase-splitting design, whenever, can work independently mutually, with single-phase is example, and basic principle can be summarized as: when system voltage just often, LVRT-DVR does not seal in system, be in hot stand-by duty, have only the by-pass switch closure this moment, and whole system is by short circuit, and only power loss is a switching loss; When system detected voltage dip, LVRT-DVR dropped into rapidly, finished fault and passed through.
When detecting system voltage decline, the rapid disjunction of electronic switch, LVRT-DVR makes the device for power switching pulse release in the inverter bridge rapidly, sends bucking voltage, keeps normal level to guarantee load side voltage.Simultaneously, because line voltage descends, the instantaneous active power that will cause being sent to electrical network descends, and constant for the active power of keeping unit output, LVRT-DVR will absorb superfluous active power, keep meritorious balance.Can make the LVRT-DVR dc voltage rise like this,, when system detects direct voltage above the input threshold, open power consumption resistance, the energy consumption of final surplus is fallen to the dc capacitor charging.
After voltage recovers, when system detects voltage and returns to threshold value, the electronic switch that closes immediately, LVRT-DVR switches the backheat stand-by state, waits for fault input next time.
The overall structure that the present invention is based on MW level double-fed type wind-powered electricity generation pilot system as shown in Figure 3, this is a kind of typical example structure of the present invention.This system mainly comprise MW level double-fed type current transformer, MW level double-fed type generating set, MW level drag frequency converter, distribution transformer and and the site before the electrical network low-voltage generation equipment and the electrical network low-voltage fastening that seal in.This pilot system can be simulated the electric voltage dropping fault of various operating modes, finishes the test that a series of blower fan current transformer low-voltages are passed through performance and low-voltage support performance.
With interview the similar place of check system routinely and be, for blower fan system that is virtually reality like reality, pilot system is to drag frequency converter and asynchronous motor as prime mover, prime mover links to each other by shaft coupling with the rotor portion of double-fed generator, its rotating speed is adjustable continuously, can cover rotating speed of motor scope in the true blower fan fully, double-fed type current transformer and double-fed generator then are current transformer and the motors in the true blower fan.The power section of whole system is from the electrical network power taking, and the electricity that sends feeds back to electrical network, and therefore, the electric energy of whole test system input just is used for compensating internal loss.
Because current transformer and site and distribution system between embedded electrical network low-voltage generation equipment and electrical network low-voltage fastening, and electrical network low-voltage generation equipment and electrical network low-voltage fastening also are series connection mutually, therefore move back by the throwing of selecting low-voltage generation equipment and low-voltage fastening, can make pilot system possess multiple test function:
1) takes place and fastening when all withdrawing from (bypass) when the electrical network low-voltage, promptly form conventional wind power system ground experiment platform (the wind-powered electricity generation test platform under the line voltage normal condition), can carry out the conventionally test of wind electric converter, gear box, double-fed (or directly driving) motor etc.;
2) when electrical network low-voltage generation equipment input, when electrical network low-voltage fastening withdraws from (bypass), can carry out the low-voltage of blower fan and pass through test, the test objective of this test is that the low-voltage of test blower fan when line voltage falls temporarily passed through performance.Can the electric voltage dropping degree of depth and drop-out time be set neatly by electrical network low-voltage generation equipment, even no-voltage can be set fall, can cover all test demands that the blower fan low-voltage is passed through;
3) take place and fastening when all dropping into when the electrical network low-voltage, can carry out the low-voltage of blower fan and pass through the support test, the test objective of this test is, test low-voltage fastening when line voltage falls temporarily makes the wind-powered electricity generation unit finish low-voltage and passes through the be incorporated into the power networks compensating action of point voltage of blower fan.Can the electric voltage dropping degree of depth and drop-out time be set neatly by electrical network low-voltage generation equipment, when low-voltage took place, the rapid response concurrent of electrical network low-voltage fastening went out bucking voltage, and promptly also the voltage compensation of site gets up.
Further, the present invention's low-voltage that can be applied to photovoltaic inversion system and each sensitive loads (be subjected to voltage dip or voltage fluctuation to influence bigger load, mainly refer to speed governing frequency converter etc.) is passed through and low-voltage supports test:
1) low-voltage that " electrical network low-voltage generation equipment and electrical network low-voltage fastening " can be transplanted to photovoltaic DC-to-AC converter is passed through in the test system;
2) also " wind electric converter+generator " load in the wind-powered electricity generation pilot system can be changed into " speed governing frequency converter+motor " load, can carry out the application test of low-voltage fastening under speed governing inverter load occasion based on DVR.
Above embodiment only is used to illustrate that technical scheme of the present invention is not intended to limit, and modified in various forms of carrying out with reference to the foregoing description or change are all within protection scope of the present invention.
Claims (4)
1. a low-voltage is passed through or low-voltage support comprehensive test system, comprise and to do the equipment that low-voltage is passed through, it is characterized in that: do equipment that low-voltage passes through at described needs and the site before seal in electrical network low-voltage generation equipment and electrical network low-voltage fastening, thereby constitute this comprehensive test system.
2. low-voltage according to claim 1 is passed through or low-voltage supports comprehensive test system, it is characterized in that: described electrical network low-voltage generation equipment and electrical network low-voltage fastening all are to adopt the principle of dynamic electric voltage recovery device to realize.
3. low-voltage according to claim 1 and 2 is passed through or low-voltage supports comprehensive test system, and it is characterized in that: described electrical network low-voltage generation equipment comprises the electrical network low-voltage generating unit of three-phase separate configurations, three-phase mutually noninterfere; Described electrical network low-voltage fastening comprises the electrical network low-voltage support unit of three-phase separate configurations, three-phase mutually noninterfere; Three phase network low-voltage generating unit and the corresponding serial connection of three phase network low-voltage support unit.
4. low-voltage according to claim 3 is passed through or low-voltage supports comprehensive test system, it is characterized in that: described electrical network low-voltage generating unit is consistent with the structure of electrical network low-voltage support unit, all be to comprise single-phase H bridge inverter circuit, energy management unit, circuit breaker and power semiconductor switch, wherein: energy management unit provides the direct voltage input for single-phase H bridge inverter circuit, circuit breaker and power semiconductor switch all are connected in parallel between the output of single-phase H bridge inverter circuit, and two outputs of single-phase H bridge inverter circuit are respectively as the input and the output of electrical network low-voltage generating unit or electrical network low-voltage support unit.
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Cited By (6)
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| CN103560523A (en) * | 2013-11-18 | 2014-02-05 | 国家电网公司 | Photovoltaic generator set low-voltage ride-through supporting system based on DVR |
| CN103576089A (en) * | 2013-08-07 | 2014-02-12 | 国家电网公司 | High-low-voltage ride-through testing system based on series dynamic voltage recovery device |
| CN108152667A (en) * | 2017-11-29 | 2018-06-12 | 中国电力科学研究院有限公司 | A kind of virtual synchronous generator failure passes through detection device and method |
| CN108199378A (en) * | 2017-12-30 | 2018-06-22 | 国网天津市电力公司电力科学研究院 | A kind of dynamic electric voltage recovery device compensating control method |
| CN105745424B (en) * | 2013-11-26 | 2019-02-05 | 法国大陆汽车公司 | It is used to manipulate two loads with keeping with peak value using the electronic equipment of manipulation DC motor |
| CN112395770A (en) * | 2020-11-26 | 2021-02-23 | 中国科学院电工研究所 | Simplified influence analysis method for wind turbine generator transmission chain ground test platform |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103576089A (en) * | 2013-08-07 | 2014-02-12 | 国家电网公司 | High-low-voltage ride-through testing system based on series dynamic voltage recovery device |
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| CN105745424B (en) * | 2013-11-26 | 2019-02-05 | 法国大陆汽车公司 | It is used to manipulate two loads with keeping with peak value using the electronic equipment of manipulation DC motor |
| CN108152667A (en) * | 2017-11-29 | 2018-06-12 | 中国电力科学研究院有限公司 | A kind of virtual synchronous generator failure passes through detection device and method |
| CN108199378A (en) * | 2017-12-30 | 2018-06-22 | 国网天津市电力公司电力科学研究院 | A kind of dynamic electric voltage recovery device compensating control method |
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| CN112395770A (en) * | 2020-11-26 | 2021-02-23 | 中国科学院电工研究所 | Simplified influence analysis method for wind turbine generator transmission chain ground test platform |
| CN112395770B (en) * | 2020-11-26 | 2023-10-03 | 中国科学院电工研究所 | Simplified influence analysis method for ground test platform of transmission chain of wind turbine generator |
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Application publication date: 20130731 |