Method for testing response characteristic of 690V wind turbine generator to transient change of power grid

Abstract

The invention discloses a method for testing response characteristic of a 690V wind turbine generator to transient change of a power grid, and belongs to the technical field of methods for testing transient response characteristics of wind turbine generator power grids. The method is particularly used for testing the response characteristic of a wind turbine generator at a wind turbine generator set end (with the voltage of 690V) when the power grid voltage, frequency and power quality of the wind turbine generator are changed transiently. By the aid of the method, testing operation can be carried out at the wind turbine generator set end, the method has the remarkable advantages of simplicity in connection and convenience in field testing, the running condition of the wind turbine generator can be directly tested at the wind turbine generator end, and running characteristics of the wind turbine generator can be effectively reflected. The method has profound social and market benefits and a profound application prospect.

Description

technical field [0001] The invention is a method for testing the transient response characteristics of a wind turbine power grid with a voltage level of 690V, which belongs to the technical field of testing methods for the transient response characteristics of a wind turbine power grid, and is particularly useful for testing the wind turbine power grid voltage, frequency, and power quality at the wind turbine terminal (690V). Detect the response characteristics of wind turbines when transients occur. Background technique [0002] At present, most of the areas with rich wind resources and better mining efficiency in China are located in remote areas, and their power grids are often terminal power grids with small capacity, poor power quality, and are easily affected by loads. This puts forward higher requirements for the grid adaptability of wind turbines, that is, wind turbines are required to adapt to the local grid as much as possible to ensure that grid-connected power ge...

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Problems solved by technology

[0003] What needs to be pointed out is that the change of the grid frequency directly affects the synchronous speed of the generator, and affects the voltage, current and power parameters of the generator and the converter, but the change of the grid frequency is generally difficult to appear in the laboratory; in addition, For some export models, it is necessary to conduct actual operation tests under 60Hz power grid, so customers sometimes have to purchase huge diesel generator sets

The general voltage regulator has a large internal resistance, and its output voltage is easily affected by grid fluctuations and load changes; and its contact parts are easily damaged by ignition during load adjustment; in terms of function, only the output voltage amplitude can be adjusted. It is impossible to change the frequency, waveform, etc., nor can it achieve the steady-state accuracy and dynamic flicker required by customers.

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