Wind power generation system and operation control method thereof

Abstract

The embodiment of the invention provides a wind power generation system and an operation control method thereof. The wind power generation system comprises a generator and a converter, the generator comprises a stator and a rotor, the stator is connected to a power grid through a stator grid-connected circuit breaker, the rotor is connected to the power grid through the converter, and the converter comprises a machine-side converter and a grid-side converter. The method comprises the steps that before the wind speed reaches the wind speed capable of generating power, a wind power generation system is controlled to enter a small wind shutdown mode; when the wind speed reaches the power generation wind speed and does not exceed the first wind speed, the wind power generation system is controlled to operate in a first operation mode; when the wind speed exceeds the first wind speed, the wind power generation system is controlled to operate in a second operation mode; when the wind speed is in the second wind speed interval, the wind power generation system is controlled to operate in a third operation mode, and the first wind speed is smaller than the second wind speed interval; and when the wind speed exceeds the second wind speed interval, the wind power generation system is controlled to operate in the second operation mode, and therefore the utilization rate of wind energy can be increased.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of wind power, and in particular to a wind power generation system and an operation control method thereof. Background technique [0002] With the gradual depletion of energy sources such as coal and oil, human beings pay more and more attention to the utilization of renewable energy. As a clean and renewable energy, wind energy has been paid more and more attention by countries all over the world. For coastal islands, grasslands, pastoral areas, mountainous and plateau areas that lack water, fuel, and inconvenient transportation, the use of wind power generation according to local conditions is very suitable and promising. [0003] A wind power generation system is an energy conversion system that converts wind energy into electrical energy through a generator. There are various types of generators, among which doubly-fed generators occupy a large proportion in wind power generat...

AI Technical Summary

Problems solved by technology

[0004]At present, in the traditional DFIG wind power generation system, the generator cannot be connected to the grid for power generation at a low speed, because the DFIG can only Operate within a certain range of slip rate. In the case of low or high speed, the slip rate is large, which exceeds the capacity of the AC voltage that the converter can provide, and the wind power generation system cannot operate.

Therefore, wind energy in some areas cannot be utilized

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