STATCOM/BESS-based wind turbine group coordinated self-starting control method

Abstract

The invention discloses an STATCOM / BESS-based wind turbine group coordinated self-starting control method, which comprises the steps of: S1, designing a self-starting controller based on a feedback linear control algorithm for model characteristics of a DFIG in self-starting when the self-starting of the DFIG under an off-grid condition begins; S2, merging the self-starting controller into an STATCOM / BESS after the self-starting controller detects that islanding operation voltage and frequency of a draught fan are stable; S3, and merging the STATCOM and the DFIG equipped with an energy storage system into the DFIG which is not equipped with an energy storage system after the STATCOM and the DFIG are started, and coordinating a fuzzy PID controller to start, wherein the fuzzy PID controller utilizes a fuzzy PID algorithm, monitors voltage and frequency stabilization conditions of the newly-merged DFIG continuously, optimizes PID controller parameters of the STATCOM and the DFIG equipped with the energy storage system continuously through fuzzy reasoning, and coordinates active and reactive power output of the draught fan and the STATCOM. The STATCOM / BESS-based wind turbine group coordinated self-starting control method enables the double-feeding asynchronous wind turbine group to achieve self-starting under the off-grid condition, and further achieves stable islanding operation.

Description

technical field [0001] The invention relates to the field of operation control of wind turbines, in particular to a STATCOM / BESS-based coordinated self-starting control method for wind turbines. Background technique [0002] In recent years, due to the intermittence, randomness, and volatility of wind power, large-scale wind power grid integration still has many challenges. Distributed wind power generation can restore island power supply when a power outage occurs, and has become an indispensable and important supplement to centralized power supply. In order to better realize the distributed power generation of wind turbines, it is necessary to study the self-starting ability of wind turbines under island operation. [0003] Nowadays, the Doubly-Fed Induction Generator (DFIG) has become the mainstream model selected by wind farms. Since the wind turbine adopts the flexible connection method of the stator and rotor, it does not have self-starting capability. An energy stor...

AI Technical Summary

Problems solved by technology

During the start-up process of wind turbines, large-scale energy storage systems require a large investment and cannot meet the economic requirements of the power grid. This requires a small number of wind turbines equipped with energy storage systems to be the first to realize self-starting, and then with the assistance of FACTS equipment Start the rest of the wind turbines

[0004] The traditional STATCOM consists of a DC side capacitor and a voltage-type inverter. In order to ensure the amplitude of the output voltage, it needs to absorb a certain amount of active power from the grid to compensate its own loss in order to maintain the DC measured voltage. Therefore, it does not have the ability to adjust active power and cannot Inject active power into the grid

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