无刷双馈式感应发电机低电压穿越能力分析

Analysis of Low-Voltage Ride-Through Capability of Brushless Doubly-Fed Induction Generator

通过分析电网电压跌落时无刷双馈式感应发电机的动态模型以及磁通量、反电动势和电流的变化;提出采用crowbar电路和串联动态电阻的组合电路提高发电机低电压穿越能力的方法,并计算其中的电阻值;利用Matlab/Simulink仿真软件建立基于无刷双馈式感应发电机的风力发电系统仿真模型,对比加了保护和不加任何保护装置的风电系统仿真结果的各参数。仿真结果表明,提出的方法能有效保护风力发电机组,提高风力发电机组低电压穿越能力。

This paper discusses the dynamic behavior of the brushless doubly-fed induction generator, the variation of the fluxes, back EMFs, and currents during the voltage dip. An approach to improve the generator ride-through capability using the combinational circuit of the crowbar circuit and the series dynamic resistor is proposed and appropriate values for their resistances are calculated. The wind power system simulation model of the brushless doubly-fed induction generator is established based on Matlab/Simulink simulation platform. Parameters of the simulation results of the wind power generation system with and without any protective device are compared. Experimental results show that the proposed approaches can effectively protect the wind power generation system and improve the ability of low voltage ride-through.