CN210572653U - Megawatt photovoltaic inverter system multifunctional test platform - Google Patents

Abstract

The utility model relates to a multi-functional test platform of megawatt level photovoltaic inverter system, the utility model discloses a core is the voltage access that converts commercial power AC380V into DC1000 or 1500V grade through the inverse direct current source by test equipment, then converts AC315V, 380V, 600V, 10KV, 35KV of equipment under test output into AC380V feedback electric wire netting through the transformer that is incorporated into the power networks. The test platform is flexible and changeable, and can be suitable for testing photovoltaic products such as pre-installed photovoltaic systems and inverter rooms with different capacities and different voltage levels, the maximum direct current power is 4MW alternating current power and 3MW, and in addition, the multifunctional megawatt test platform can feed back the output electric energy of the tested equipment to a public power grid, the requirement on the capacity of a transformer of the power grid is reduced, and the purposes of energy conservation and emission reduction are achieved.

Description

Megawatt photovoltaic inverter system multifunctional test platform

Technical Field

The utility model relates to a device that is used for carrying out the test to megawatt level prepackage type photovoltaic system's working property.

Background

By the end of 2016, the newly increased installed capacity of 3454 ten thousand kilowatts and the accumulated installed capacity of 7742 ten thousand kilowatts in the photovoltaic power generation in China are the first installed capacity in the world, the photovoltaic power generation needs to realize the flat-price internet surfing in 2020, does not depend on the subsidy of the state and directly enters the development of the market mechanism, and the national energy agency also uses the evaluation of the internet surfing as an important target of thirteen-five planning.

With the rapid development of the photovoltaic industry, the competition of the photovoltaic product industry is increasing day by day, and it is important to improve the product quality for improving the product competitiveness, at present, a megawatt preassembled photovoltaic system is a core part of a large-scale solar power station in the market, and integrates an inverter, a monitoring system, a boost transformer, a switch cabinet, power distribution, an entrance guard monitoring and fire alarm system, and an automatic temperature and humidity control ventilation system, so that the megawatt preassembled photovoltaic system is particularly important for testing key technical indexes such as energy conservation, safety, reliability, economy and the like.

The existing equipment for testing the megawatt-level pre-installed photovoltaic system has the following defects: 1) the megawatt direct current source has high cost, and the cost of a single direct current source is as high as more than million yuan; 2) a test equipment room and a heat dissipation system need to be independently established, so that the construction period is long, and the investment cost is high; 3) the single machine 2 megawatt test equipment has large volume and occupies about 100 areas of a factory building²More than rice; 4) due to the technical innovation, the equipment updating and upgrading speed is high, and the test equipment needs to be updated synchronously, so that the investment is large.

Disclosure of Invention

The utility model aims at: the multifunctional megawatt-level test platform system has the advantages of complete functions, reasonable equipment configuration, convenience in operation, high measurement precision and high automation degree.

In order to achieve the above object, the technical solution of the present invention is to provide a multi-functional test platform for a megawatt-level pv inverter system, wherein the tested megawatt-level pv inverter system has N inverters, N is greater than or equal to 1, and each inverter has a dc side and an ac side, the multi-functional test platform is integrated in a container, including a control cabinet disposed in the container, one end of the control cabinet is connected to a power grid, and the other end is connected to the tested megawatt-level pv inverter system via a dc source transformer, a dc source and a grid-connected transformer, and the utility power generated by the power grid is connected to the tested megawatt-level pv inverter system via the control cabinet, and meanwhile, the electric energy generated by the tested megawatt-level pv inverter system is fed back to the power grid via the control cabinet;

the multifunctional test platform also comprises 2N direct-current source transformers, 2N direct-current sources and N grid-connected transformers, and the control cabinet is respectively connected with the input ends of the 2N direct-current sources through the 2N direct-current source transformers; the direct current side of each inverter of the tested megawatt photovoltaic inverter system is connected with two direct current sources, wherein the positive pole of the direct current side of the inverter is connected with the positive pole of the output of one direct current source, the negative pole of the output of the direct current source is connected with the positive pole of the output of the other direct current source, and the negative pole of the output of the other direct current source is connected with the negative pole of the direct current side of the inverter;

the control cabinet is respectively connected with the alternating current sides of N inverters of the tested megawatt photovoltaic inverter system through N grid-connected transformers.

Preferably, the direct current source is an AC/DC direct current source.

The utility model discloses a technical scheme provides a multi-functional test platform of megawatt photovoltaic inverter system, and the megawatt photovoltaic inverter system under test has N dc-to-ac converter, and N is more than or equal to 1, and every dc-to-ac converter has direct current side and alternating current side, and its characterized in that, multi-functional test platform is integrated in the container, including locating the switch board in the container, the electric wire netting is connected to the one end of switch board, and the other end links to each other with the megawatt photovoltaic inverter system under test via direct current source transformer, direct current source and grid-connected transformer, and the commercial power that the electric wire netting produced passes through the switch board and inserts the megawatt photovoltaic inverter system under test, and simultaneously, the electric energy that the megawatt photovoltaic inverter system under test produced feeds back through the switch board;

the multifunctional test platform also comprises N direct current source transformers, N direct current sources and N grid-connected transformers, and the control cabinet is respectively connected with the input ends of the N direct current sources through the N direct current source transformers; the direct current side of each inverter of the tested megawatt photovoltaic inverter system is connected with a direct current source, wherein the positive pole of the direct current side of the inverter is connected with the positive pole of the output of the direct current source, and the negative pole of the direct current side of the inverter is connected with the negative pole of the output of the direct current source;

the control cabinet is respectively connected with the alternating current sides of N inverters of the tested megawatt photovoltaic inverter system through N grid-connected transformers.

Preferably, the direct current source is an AC/DC direct current source.

The utility model has the characteristics of as follows:

1) and changing the DC/AC inverter into an AC/DC direct current source as a test direct current source.

2) The provided multifunctional megawatt-level test platform has the advantages of perfect functions, reasonable equipment configuration, convenient operation, high measurement precision and high automation degree;

3) the maximum AC power of 35KV and large capacity is 3 MW.

Drawings

FIG. 1 is a schematic diagram of a 2X1500KW AC600V inversion room test;

FIG. 2 is a schematic diagram of a 2X1000KW AC35KV pre-packaged photovoltaic system test;

fig. 3 is an operation flowchart of the present invention, in which:

QFM1, QF 1-QF 8 and 1QF1 are all circuit breakers.

Detailed Description

The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.

For convenience of explanation, the present invention will be further described below by taking a 3MW multifunctional test platform system as an example (note: it is possible to adjust the system according to different devices).

As shown in fig. 1, the multi-functional megawatt test platform system disclosed in this embodiment includes: 4 1MW inversion direct current sources are used for simulating programmable direct current simulation sources of the working characteristics of the photovoltaic module and simulating the direct current electric energy input of a system to be tested; 1 remote control grid-connected power distribution cabinet which is used as on-off control and protection of a direct current source and system grid connection of a detection platform; the grid-connected transformer comprises: 2 transformers of 1500KVA 400V/315V/500V/600V, 1 transformer of 1250KVA10KV/0.4KV and 1 transformer of 2500KVA 35KV/0.4KV, so that different requirements of the tested megawatt-level system on voltage grades are met. Other test devices such as: the device comprises a power analyzer, an safety tester, a voltage endurance tester, a direct current resistance tester, an oscilloscope, an electric energy quality analyzer, a test monitoring device, a test operating console and the like. The megawatt-level test detection platform can be in accordance with the Chinese golden sun new certification standard CNCA-CTS 004: 2009. the method comprises the steps of carrying out remote control, remote measurement and remote regulation tests on shipment system products according to standards such as IEC62116-2008 'test method for island protection measures of grid-connected photovoltaic inverters', GB7251.1-2005 'inverter thermal test specification (20100208) V1.0' and the like, simulating actual operation conditions on site, and monitoring parameters such as voltage, current, power factor, frequency and the like of a tested system in real time. The automatic storage time interval of the measurement data can be set. The test data of the tested system product can be conveniently extracted and analyzed, the test efficiency is improved, the test effectiveness is ensured, the product meets the technical requirements, and the quality reliability of the delivered product is ensured. Because the whole test process is not adopted, electric energy flows to a tested system from a power grid during test and finally returns to the power grid, and the loss of the electric energy in the whole test process is only the internal loss of the test equipment and the tested equipment, so that the test cost is saved. And the whole set of test equipment is integrated in the container, and the test equipment can be flexibly configured according to actual needs.

In order to ensure the safety of the test platform circuit and equipment, the three-stage current protection setting is carried out on each stage of control switch through calculation. Before testing, the tested equipment is placed on a corresponding testing station and connected with a wire, a testing circuit is locked on an operation screen of the monitoring platform, and after selection, a control switch on the testing platform automatically forms interlocking, so that personal injury or equipment short circuit caused by misoperation of operators are avoided.

In order to ensure safe operation, the operation sequence of the multifunctional megawatt-level test platform system is established. In order to ensure the safety of testers, a test platform operation regulation is established. All tested devices are required to be guaranteed to be well grounded before testing (any electric ground in the tested devices is guaranteed to be not more than 100 milliohms to a grounding grid of a tested platform); before testing, an engineer in charge of the testing wears protective articles according to the operation rules; a temporary barrier or a red-white belt with red-white marks is arranged on a test site; warning boards of ' stop, high-pressure danger ' working at the place ' are hung outwards, and people are sent to watch.

Another possible test platform is shown in fig. 2, and is a test platform of a 2X1250KW DC35KV pre-installed photovoltaic system, and is composed of 2 direct current sources of 1MW, 2 direct current source transformers, 1 AC35KV 2500KVA grid-connected transformer, 1 control cabinet, and a monitoring platform.

As shown in fig. 3, the two test platforms have similar operation flows: firstly, the tested device is placed at a corresponding testing station, and then wiring is carried out. And after wiring is finished, selecting a test circuit on the test monitoring screen to test the equipment.

The multifunctional megawatt-level test platform simulates a field use environment, strictly tests the working performance of a megawatt-level pre-installed photovoltaic system, integrates the functions of a plurality of existing monitoring devices, and realizes the tests of inversion and boosting functions, such as the tests of parameters of voltage, current, harmonic wave, power factor and the like.

The core of the test platform is that the commercial power AC380V is converted into DC1000 or 1500V grade voltage through an inverse direct current source and is connected into the tested equipment, and then AC315V, 380V, 600V, 10KV and 35KV output by the tested equipment are converted into AC380V through a grid-connected transformer and fed back to the power grid. The test platform is flexible and changeable, and can be suitable for testing photovoltaic products such as pre-installed photovoltaic systems and inverter rooms with different capacities and different voltage levels, the maximum direct current power is 4MW alternating current power and 3MW, and in addition, the multifunctional megawatt test platform can feed back the output electric energy of the tested equipment to a public power grid, the requirement on the capacity of a transformer of the power grid is reduced, and the purposes of energy conservation and emission reduction are achieved.

The multifunctional megawatt-level test platform is integrated in the container and can run outdoors, so that the capital construction cost of the test platform is saved. In addition, the test platform is convenient to move, and the maneuverability of the test platform is met.

Claims (4)

1. A multi-functional test platform of megawatt photovoltaic inverter system, the megawatt photovoltaic inverter system tested has N inverters, N is greater than or equal to 1, every inverter has direct current side and AC side, characterized by that, the said multi-functional test platform is integrated in the container, including locating the control cabinet in the container, one end of the control cabinet connects the electric wire netting, another end couples to megawatt photovoltaic inverter system tested through direct current source transformer, direct current source and grid-connected transformer, the commercial power that the electric wire netting produces is connected to megawatt photovoltaic inverter system tested through the control cabinet, at the same time, the electric energy that the megawatt photovoltaic inverter system tested produces is fed back to the electric wire netting through the control cabinet;

the multifunctional test platform also comprises 2N direct-current source transformers, 2N direct-current sources and N grid-connected transformers, and the control cabinet is respectively connected with the input ends of the 2N direct-current sources through the 2N direct-current source transformers; the direct current side of each inverter of the tested megawatt photovoltaic inverter system is connected with two direct current sources, wherein the positive pole of the direct current side of the inverter is connected with the positive pole of the output of one direct current source, the negative pole of the output of the direct current source is connected with the positive pole of the output of the other direct current source, and the negative pole of the output of the other direct current source is connected with the negative pole of the direct current side of the inverter;

the control cabinet is respectively connected with the alternating current sides of N inverters of the tested megawatt photovoltaic inverter system through N grid-connected transformers.

2. The multi-functional test platform of a megawatt photovoltaic inverter system as claimed in claim 1, wherein the DC source is an AC/DC source.

3. A multi-functional test platform of megawatt photovoltaic inverter system, the megawatt photovoltaic inverter system tested has N inverters, N is greater than or equal to 1, every inverter has direct current side and AC side, characterized by that, the said multi-functional test platform is integrated in the container, including locating the control cabinet in the container, one end of the control cabinet connects the electric wire netting, another end couples to megawatt photovoltaic inverter system tested through direct current source transformer, direct current source and grid-connected transformer, the commercial power that the electric wire netting produces is connected to megawatt photovoltaic inverter system tested through the control cabinet, at the same time, the electric energy that the megawatt photovoltaic inverter system tested produces is fed back to the electric wire netting through the control cabinet;

the multifunctional test platform also comprises N direct current source transformers, N direct current sources and N grid-connected transformers, and the control cabinet is respectively connected with the input ends of the N direct current sources through the N direct current source transformers; the direct current side of each inverter of the tested megawatt photovoltaic inverter system is connected with a direct current source, wherein the positive pole of the direct current side of the inverter is connected with the positive pole of the output of the direct current source, and the negative pole of the direct current side of the inverter is connected with the negative pole of the output of the direct current source;

the control cabinet is respectively connected with the alternating current sides of N inverters of the tested megawatt photovoltaic inverter system through N grid-connected transformers.

4. The multi-functional test platform of a megawatt photovoltaic inverter system as claimed in claim 3, wherein the DC source is an AC/DC source.

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