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High-power DC source used for testing of photovoltaic grid-connected inverter

An inverter and DC source technology, applied in the field of high-power DC source for photovoltaic grid-connected inverter testing, can solve the problem of low output power, inability to meet test requirements, and inability to effectively build a photovoltaic converter power test platform, etc. problem, to achieve the effect of smooth and stable waveform, fast response time, and small impact on equipment

Inactive Publication Date: 2015-02-04
XJ ELECTRIC
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Problems solved by technology

[0003] Chinese patent application numbers 201320448910.7 and 201320300928.2 disclose a high-power DC converter, which mainly provides services for DC fans. Its output power is relatively small, and it cannot effectively build a power test platform for photovoltaic converters and cannot meet the test requirements.

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  • High-power DC source used for testing of photovoltaic grid-connected inverter

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Embodiment Construction

[0019] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0020] Through the analysis of the conventional test principle of the rated power circulation test of the entire photovoltaic grid-connected inverter, the rated power test and some type tests of the photovoltaic grid-connected inverter require that the input voltage level of the DC source of the photovoltaic grid-connected inverter must be able to Simulate the normal voltage level of the on-site battery panel, and the DC voltage is adjustable, which can provide pure DC power to prevent interference with the photovoltaic grid-connected inverter; the DC source of the photovoltaic grid-connected inverter can also be normal under the condition of 1.1 times overload The output is stable and reliable direct current. Therefore, the high-power DC source of the present invention needs to be fully functional, easy to move, easy to operate, and complete ...

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Abstract

The invention discloses a high-power DC source used for testing of a photovoltaic grid-connected inverter. Two sets of parallel-connected three-phase full-bridge controllable rectification circuits are adopted so that input voltage range is wider, adaptability is higher, high-power DC can be outputted, level of the outputted DC voltage can be adjusted according to test requirements, and output power can meet the capacity requirement of domestic inverters. The outputted DC voltage is smooth and stable in waveform and common mode voltage to the ground is low. DC voltage response time is short, voltage build-up rate is 80V / s, impact to equipment is low and voltage overshoot amount is 0V so that the tested equipment is ensured to be safe and reliable. DC output adopts parallel-connected output of two paths of DC800A circuit breakers so that DC allowance is high, and a tripping phenomenon does not occur when the tested inverter is overloaded for 1.1 times.

Description

technical field [0001] The invention relates to a high-power DC source for testing a photovoltaic grid-connected inverter. Background technique [0002] Due to the frequent occurrence of smog weather and environmental pollution incidents, the state vigorously supports the development of renewable and clean energy industries, and the wind power industry is showing restorative growth: from 2014 to 2020, an annual increase of 20 million kilowatts (20GW) of installed capacity will be added. The situation in the photovoltaic industry is positive: at the 2014 National Energy Work Conference, the National Energy Administration has formulated a plan to add 14GW of domestic photovoltaic installed capacity in 2014. With the promotion of photovoltaic power stations, the photovoltaic inverter market will be further expanded. With the expansion of the inverter market, the annual production of photovoltaic grid-connected inverters is increasing year by year, but most of the inverter measu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219
CPCH02J3/383H02M5/4585Y02B10/10Y02E10/56
Inventor 焦照旭龚晓伟王景丹胡亮常忠廷张学成屈路军白金刚
Owner XJ ELECTRIC
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