Grid-tied testing device for wind electricity and photovoltaic energy and testing method thereof

Abstract

The invention provides a grid-tied testing device for wind electricity and photovoltaic energy and a testing method thereof. The testing device comprises a power converter, a series connection transformer, a shunt transformer, an input breaker, an output breaker, a protective breaker, a first function change-over switch, a second function change-over switch, a third function change-over switch, a fourth function change-over switch, a by-pass switch and a digital signal processor (DSP) control and detection unit. An input end of the testing device is connected with a power grid, and an output end of the testing device is connected with a wind generating set or a photovoltaic generating station as a device to be tested. Deviation voltage or harmonic voltage output by the power converter and nominal voltage or fundamental voltage of the power grid are overlaid for achieving power grid adaptability requirements, and therefore the capacity of the power converter is far smaller than the rated capacity of the device to be tested. Due to the fact that the capacity of the power converter is reduced, the purposes that a system is low in cost, small in size, light in weight, small in heating value, high in reliability and the like can be achieved.

Description

technical field [0001] The invention belongs to a test device for a grid-connected power generation system in the field of new energy, and particularly provides a grid-connected test device for wind power and photovoltaics and a testing method thereof, which can meet the grid adaptability function test of wind turbines and photovoltaic power stations. Background technique [0002] In recent years, China's wind power and photovoltaic power generation industries have developed rapidly, and the installed capacity has grown rapidly year after year. For example, in 2010, 12,904 new wind turbines were added, with an installed capacity of 18.93GW, a year-on-year increase of 73.3%, and a cumulative installed capacity of 44.733GW, surpassing the United States to rank first in the world. Three wind power equipment manufacturers have entered the top ten in the world. In 2011, China's photovoltaic production capacity was 30GW, accounting for 60% of the global production capacity, and se...

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Problems solved by technology

[0003] At the same time, there are also many problems in the operation of wind power and photovoltaics in China: At present, there have been many large-scale wind turbine off-grid events in China. A fault caused a three-phase short circuit, causing 598 wind turbines in 16 wind farms to go off-grid

[0007] The power grid adaptability test devices disclosed in the above-mentioned patent documents are either aimed at wind turbines or photovoltaic inverters, and have a single application; and the second patent uses a power converter to complete the full-power test, which is large in size, The high cost also increases the difficulty of manufacturing the system and limits the expansion of the power converter

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