CN105207616A - Low voltage ride through (LVRT) testing device for photovoltaic inverter - Google Patents
Low voltage ride through (LVRT) testing device for photovoltaic inverter Download PDFInfo
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- CN105207616A CN105207616A CN201510598237.9A CN201510598237A CN105207616A CN 105207616 A CN105207616 A CN 105207616A CN 201510598237 A CN201510598237 A CN 201510598237A CN 105207616 A CN105207616 A CN 105207616A
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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
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Abstract
The invention discloses a low voltage ride through (LVRT) testing device for a photovoltaic inverter. The LVRT testing device comprises a shell body and a ride through testing unit arranged inside the shell body. The shell body is provided with a port A, a port B and a port C, and the port A, the port B and the port C are connected with the ride through testing unit arranged inside the shell body. The LVRT testing device is connected with the side of a three-phase current output by the tested photovoltaic inverter through the port A, connected with the direct-current side of the tested photovoltaic inverter through the port B and connected with an external connection power grid through the port C. The ride through testing unit comprises a power analyzer, a three-phase transformer I, an AC-DC-AC convertor, a three-phase transformer II, a three-phase transformer III, a rectifier, a photovoltaic simulator, a wave recorder, a voltage/current sensor I, a voltage/current sensor II, a voltage/current sensor III, a voltage/current sensor IV and a touch screen. According to the technical scheme, the defects in the prior art are overcome, the dropout voltage can be set continuously and accurately, the tracking speed is high, the characteristic is hard, energy consumption is small, movable testing is achieved, and the requirements for testing precision and long-time operation are met.
Description
Technical field
The invention belongs to field of electrical equipment, particularly relate to a kind of low voltage ride through of photovoltaic inverter testing apparatus.
Background technology
Along with industrial or agricultural expanding economy, the access of various load makes the environment of power distribution network day by day complicated, often there will be line voltage short-term and falls phenomenon.National grid directive/guide requires that photovoltaic combining inverter can not run by off-grid in grid voltage sags moment certain limit, and contributes to the stable of line voltage and fault traversing.For test light photovoltaic generating system low voltage crossing (LVRT) serviceability, need to build low voltage ride through of photovoltaic inverter testing apparatus.Current existing testing apparatus is the method for testing adopting impedance dividing potential drop, this testing apparatus exist Voltage Drop arrange discontinuous, measuring accuracy is not high, capacity large, heating is serious, it is high to consume energy and can not long playing shortcoming.
Summary of the invention
The object of the present invention is to provide a kind of low voltage ride through of photovoltaic inverter testing apparatus, this passes through testing apparatus and overcomes the deficiencies in the prior art, accurately can set drop-off voltage continuously, tracking velocity is fast, characteristic is hard, energy consumption is little, and movable detection, meet measuring accuracy and long playing requirement.
For achieving the above object, technical scheme of the present invention is as follows: a kind of low voltage ride through of photovoltaic inverter testing apparatus, comprise housing and pass through test cell, it is characterized in that: described in pass through test cell and be built in housing, housing is provided with A port, B port and C port, be connected with the test cell that passes through be built in housing respectively, describedly pass through the three-phase alternating current side that testing apparatus exported by A port and tested photovoltaic DC-to-AC converter and be connected, be connected with tested photovoltaic DC-to-AC converter DC side by B port, be connected with outside electric power network by C port; The described test cell that passes through comprises:
Power analyzer; Described power analyzer detects the changed power of A port by the voltage/current sensor III being connected to A port;
Three-phase transformer I; The input of described three-phase transformer I is connected with A port, and its output is connected with AC-DC-AC converter, has been used for buffer action;
AC-DC-AC converter; One end of described AC-DC-AC converter is connected with the output of three-phase transformer I, and the other end is connected with the input of three-phase transformer II, is used to provide drop-off voltage;
Three-phase transformer II; The input of described three-phase transformer II is connected with the C port of outside electric power network with AC-DC-AC converter respectively with output, is used for changing the voltage differences between electrical network and current transformer, has the effect of filtering simultaneously;
Three-phase transformer III; The input of described three-phase transformer III is connected with the C port of outside electric power network, and output is connected with rectifier, plays buffer action;
Rectifier; The input of described rectifier is connected with the output of three-phase transformer III, and the output of rectifier is connected with one end of photovoltaic simulator, forms direct voltage be supplied to photovoltaic simulator by rectification;
Photovoltaic simulator; Described photovoltaic simulator is connected between rectifier and B port, is used for simulated light photovoltaic array operation characteristic;
Oscillograph; Described oscillograph respectively by the voltage/current sensor I be arranged on B port, be arranged on voltage/current sensor II on A port and the voltage/current sensor IV that is arranged between three-phase transformer I and AC-DC-AC converter to detect the change of the voltage and current of B port, A port and three-phase transformer I output, record the voltage and current waveform of each test point.
And touch-screen; Described touch-screen is connected with AC-DC-AC converter by Ethernet interface, and by touch screen interface setting AC-DC-AC converter controling parameters, during experiment, setting voltage falls fault type.
In technique scheme, a kind of low voltage ride through of photovoltaic inverter testing apparatus of the present invention passes through three-phase transformer III from outside electric power network power taking, photovoltaic simulator (IV simulator) is accessed, photovoltaic simulator simulated light overhead utility operation characteristic after rectifier rectification.The DC side of tested photovoltaic combining inverter is connected with photovoltaic simulator, the AC of tested photovoltaic combining inverter accesses AC-DC-AC converter by three-phase transformer I, touch-screen is connected with AC-DC-AC converter by Ethernet interface, the three-phase transformer III of grid side is used for changing the voltage differences between electrical network and current transformer, there is the effect of filtering simultaneously, avoid AC-DC-AC converter to electrical network harmonic, when carrying out low voltage crossing and detecting, by touch screen interface setting AC-DC-AC converter controling parameters, setting voltage falls fault type, net side converter in AC-DC-AC converter is operated in inverter mode, fault in AC-DC-AC converter generates side converter and is operated in rectification mode, energy flows to electrical network from photovoltaic plant end.The present invention has following beneficial effect: the first, accurately can set drop-off voltage continuously; The second, tracking velocity is fast, and characteristic is hard, and energy consumption is little, movable detection; 3rd, meet measuring accuracy and long playing requirement.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of a kind of low voltage ride through of photovoltaic inverter testing apparatus of the present invention.
Embodiment
Below in conjunction with accompanying drawing, to the technical scheme in the embodiment of the present invention carry out clear, intactly set forth, described embodiment is only a part of embodiment of the present invention, the embodiment of not all.Based on the embodiment in the present invention, those skilled in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As seen from Figure 1, a kind of low voltage ride through of photovoltaic inverter testing apparatus of the present embodiment, comprise housing 1 and pass through test cell, this passes through test cell and is built in housing 1, housing 1 is provided with A port, B port and C port, be connected with the test cell that passes through be built in housing 1 respectively, the three-phase alternating current side that testing apparatus exported by A port and tested photovoltaic DC-to-AC converter of passing through of the present embodiment is connected, be connected with tested photovoltaic DC-to-AC converter DC side by B port, be connected with outside electric power network by C port.The test cell that passes through of the present embodiment is made up of power analyzer 2, three-phase transformer I 3, AC-DC-AC converter 4, three-phase transformer II 5, three-phase transformer III 6, rectifier 7, photovoltaic simulator 8, oscillograph 9, voltage/current sensor I 10, voltage/current sensor II 11, voltage/current sensor III 12, voltage/current sensor IV 13 and touch-screen 14.In the present embodiment, power analyzer 2 detects the changed power of A port by the voltage/current sensor III 12 being connected to A port; The input of three-phase transformer I 3 is connected with A port, and its output is connected with AC-DC-AC converter 4, has been used for buffer action; One end of AC-DC-AC converter 4 is connected with the output of three-phase transformer I 3, and the other end is connected with the input of three-phase transformer II 5, is used to provide drop-off voltage; The touch-screen 14 of the present embodiment is that prestige synthetic fibre leads to TK8070iH type touch-screen, be connected with AC-DC-AC converter by Ethernet interface, by touch screen interface setting AC-DC-AC converter controling parameters, during experiment, setting voltage falls fault type, comprise symmetrical voltage and fall fault and asymmetrical voltage falls fault, and the amplitude of Voltage Drop; The input of three-phase transformer II 5 is connected with the C port of outside electric power network with AC-DC-AC converter 4 respectively with output, is used for changing the voltage differences between electrical network and current transformer, has the effect of filtering simultaneously; The input of three-phase transformer III 6 is connected with the C port of outside electric power network, and output is connected with rectifier 7, plays buffer action; The input of rectifier 7 is connected with the output of three-phase transformer III 6, and the output of rectifier 7 is connected with one end of photovoltaic simulator 8, forms direct voltage be supplied to photovoltaic simulator 8 by rectification; Photovoltaic simulator 8 is connected between rectifier 7 and B port, is used for simulated light photovoltaic array operation characteristic; Oscillograph 9 respectively by the voltage/current sensor I 10 be arranged on B port, be arranged on voltage/current sensor II 11 on A port and the voltage/current sensor IV 13 that is arranged between three-phase transformer I 3 and AC-DC-AC converter 4 to detect the change of the voltage and current of B port, A port and three-phase transformer I 3 output, record the voltage and current waveform of each test point.
The low voltage crossing testing apparatus of the present embodiment is when testing, and tested photovoltaic DC-to-AC converter DC side is connected to B port, and the three-phase alternating current side that tested photovoltaic DC-to-AC converter exports is connected to A port, and the C port of testing apparatus is connected to electrical network.Pass through C port from outside electric power network power taking by three-phase transformer III 6, after rectifier 7 rectification, access photovoltaic simulator 8(IV simulator), photovoltaic simulator 8 simulated light overhead utility operation characteristic.The DC side of tested photovoltaic combining inverter is connected with photovoltaic simulator 8 by B port, the AC of tested photovoltaic combining inverter accesses AC-DC-AC converter 4 by A port and three-phase transformer I 3, grid side is used for changing the voltage differences between electrical network and current transformer by the three-phase transformer III 6 of C port, there is the effect of filtering simultaneously, avoid AC-DC-AC converter to electrical network harmonic, AC-DC-AC converter in the present embodiment generates side converter by fault and net side converter forms, its main circuit by two back-to-back three-phase two level voltage type PWM converter form, two current transformer DC side are in parallel by direct current capacitor, touch-screen 14 is connected with AC-DC-AC converter by Ethernet interface simultaneously.When carrying out low voltage crossing and detecting, by touch-screen 14 interface setting AC-DC-AC converter controling parameters, setting voltage falls fault type, comprises symmetrical voltage and falls fault and asymmetrical voltage falls fault, and the amplitude of Voltage Drop; Net side converter in AC-DC-AC converter 4 is operated in inverter mode, and the fault in AC-DC-AC converter 4 generates side converter and is operated in rectification mode, and energy flows to electrical network from photovoltaic plant end.The present embodiment can accurately set drop-off voltage continuously, tracking velocity is fast, characteristic is hard, movable detection.
The above; only embodiments of the invention; not the present invention is imposed any restrictions, every above embodiment is done according to the technology of the present invention essence any simple modification, change and equivalent method change, all still belong in the protection range of technical solution of the present invention.
Claims (1)
1. a low voltage ride through of photovoltaic inverter testing apparatus, comprise housing (1) and pass through test cell, it is characterized in that: described in pass through test cell and be built in housing (1), housing (1) is provided with A port, B port and C port, be connected with the test cell that passes through be built in housing (1) respectively, describedly pass through the three-phase alternating current side that testing apparatus exported by A port and tested photovoltaic DC-to-AC converter and be connected, be connected with tested photovoltaic DC-to-AC converter DC side by B port, be connected with outside electric power network by C port; The described test cell that passes through comprises:
Power analyzer (2); Described power analyzer (2) detects the changed power of A port by the voltage/current sensor III (12) being connected to A port;
Three-phase transformer I (3); The input of described three-phase transformer I (3) is connected with A port, and its output is connected with AC-DC-AC converter (4), has been used for buffer action;
AC-DC-AC converter (4); One end of described AC-DC-AC converter (4) is connected with the output of three-phase transformer I (3), and the other end is connected with the input of three-phase transformer II (5), is used to provide drop-off voltage;
Three-phase transformer II (5); The input of described three-phase transformer II (5) is connected with the C port of outside electric power network with AC-DC-AC converter (4) respectively with output, is used for changing the voltage differences between electrical network and current transformer, has the effect of filtering simultaneously;
Three-phase transformer III (6); The described input of three-phase transformer III (6) is connected with the C port of outside electric power network, and output is connected with rectifier (7), plays buffer action;
Rectifier (7); The input of described rectifier (7) is connected with the output of three-phase transformer III (6), and the output of rectifier (7) is connected with one end of photovoltaic simulator (8), forms direct voltage be supplied to photovoltaic simulator (8) by rectification;
Photovoltaic simulator (8); Described photovoltaic simulator (8) is connected between rectifier (7) and B port, is used for simulated light photovoltaic array operation characteristic;
Oscillograph (9); Described oscillograph (9) respectively by the voltage/current sensor I (10) be arranged on B port, be arranged on voltage/current sensor II (11) and the voltage/current sensor IV (13) be arranged between three-phase transformer I (3) and AC-DC-AC converter (4) on A port and detect I (3) change of voltage and current of output of B port, A port and three-phase transformer, record the voltage and current waveform of each test point;
And touch-screen (14); Described touch-screen (14) is connected with AC-DC-AC converter (4) by Ethernet interface, and by touch screen interface setting AC-DC-AC converter controling parameters, during experiment, setting voltage falls fault type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510598237.9A CN105207616A (en) | 2015-09-18 | 2015-09-18 | Low voltage ride through (LVRT) testing device for photovoltaic inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510598237.9A CN105207616A (en) | 2015-09-18 | 2015-09-18 | Low voltage ride through (LVRT) testing device for photovoltaic inverter |
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| CN105207616A true CN105207616A (en) | 2015-12-30 |
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Citations (4)
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| KR101193499B1 (en) * | 2012-07-10 | 2012-10-23 | (주)에스라홀딩스 | Grid connected solar generation system and method thereof |
| EP2610698A1 (en) * | 2010-08-27 | 2013-07-03 | School Judicial Person Ikutokugakuen | Solar power generation system, control device used for solar power generation system, and control method and program for the same |
| JP2015139367A (en) * | 2014-01-23 | 2015-07-30 | エルジー エレクトロニクス インコーポレイティド | Power conversion apparatus, photovoltaic module, communication device and photovoltaic system including the same |
| CN204967761U (en) * | 2015-09-18 | 2016-01-13 | 安庆师范学院 | Photovoltaic inverter low voltage ride through testing arrangement |
-
2015
- 2015-09-18 CN CN201510598237.9A patent/CN105207616A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2610698A1 (en) * | 2010-08-27 | 2013-07-03 | School Judicial Person Ikutokugakuen | Solar power generation system, control device used for solar power generation system, and control method and program for the same |
| KR101193499B1 (en) * | 2012-07-10 | 2012-10-23 | (주)에스라홀딩스 | Grid connected solar generation system and method thereof |
| JP2015139367A (en) * | 2014-01-23 | 2015-07-30 | エルジー エレクトロニクス インコーポレイティド | Power conversion apparatus, photovoltaic module, communication device and photovoltaic system including the same |
| CN204967761U (en) * | 2015-09-18 | 2016-01-13 | 安庆师范学院 | Photovoltaic inverter low voltage ride through testing arrangement |
Non-Patent Citations (1)
| Title |
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| 吴文进，苏建徽，汪海宁: ""光伏系统低电压穿越测试技术研究"", 《电力电子技术》 * |
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Application publication date: 20151230 |