Device for testing power grid adaptability of wind generator set

Abstract

The invention relates to a device for testing power grid adaptability of a wind generator set, which comprises a converter built based on a power semiconductor switch device. The input end of the converter is connected with a three-phase power supply and the output end thereof is connected with the wind generator set. The converter comprises a controller, a rectifier, a DC link and an inverter successively connected together. The controller is in signal connection with the rectifier and the inverter. The rectifier is connected with the three-phase power supply. The inverter is connected with the wind generator set. Or the converter comprises an AC-AC converter and a controller. The AC-AC converter is connected with the three-phase power supply and the wind generator set. The controller is in signal connection with the AC-AC converter. The device can bearing a majority of dynamic impacts caused by the wind generator set in the fault experiment process of the power grid to reduce the requirement of an experiment system on the capacity of the power grid. Meanwhile, the device can flexibly simulate various power grid faults, extend the test range, enrich test data and reduce the experiment period. The device can also completely test the fault data of the wind generator set in various states of the power grid.

Description

technical field [0001] The present invention relates to a test device, more specifically, to a test device for testing the grid adaptability of a wind power generating set. Background technique [0002] With the rapid development of the wind power industry and the increasing proportion of wind power installed capacity in the national power structure, more and more countries have put forward strict requirements on the grid connection conditions and grid adaptability of grid-connected wind turbines. These include the adaptation of wind turbines to grid voltage and frequency deviations and fluctuations, and low voltage ride through performance (Low Voltage Ride Through, LVRT for short). The low-voltage ride-through performance refers to the ability of the wind turbine to maintain uninterrupted grid-connected operation after the connected grid fails and the voltage of the wind farm drops, so as to avoid the removal of the wind farm from seriously affecting the operation stabilit...

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Problems solved by technology

[0006] 1. The device is bulky, high in cost, and has high requirements on the capacity of the power grid, which is inconvenient to adjust and has a long experiment period;

[0007] 2. Due to the need to simulate the deep drop of the power grid, the series current-limiting reactance X1 in the reactance network is required to be relatively large, which has a great impact on the initial operating state of the wind turbine and the test parameters during the grid fault simulation process;

[0008] 3. The initial state of the power grid voltage before the power grid fault test can not be adjusted basically, so it is difficult to test the complete data of the wind turbine generator when it fails in various states of the power grid

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