摘 要:通过对双馈感应发电机(DFIG)系统中的传统定子电压控制策略和网侧变换器控制策略的分析,给出了DFIG系统运行在电网电压小值跌落时改进的定子电压定向控制策略和网侧变换器控制策略,搭建了DFIG系统在不同控制方案下的Simulink仿真模型,系统仿真结果表明:提出的改进控制策略能有效地抑制电网电压跌落时DFIG系统的转子侧过电流和直流侧过电压,提高了系统在电网故障时的不间断运行能力。 关键词:风力发电;双馈感应发电机;定子电压定向控制;变速恒频
Abstract: Based on the analysis of conventional control strategy of stator voltage and grid-side converter for a double-fed induction generator (DFIG) system, an improved control strategy of stator voltage-oriented and grid-side converter was presented when the DFIG system was operating under the small network voltage dip, and then the Simulink model of the DFIG system operated in the different control schemes. Simulation results indicate that the presented improved strategy can effectively suppress the over-current of rotor side and over-voltage of DC-link, therefore, improve the uninterrupted operational capabilities of DFIG system against the electric network fault. Key Words: Wind power generation; Doubly-fed induction generator; Stator voltage-oriented control; Variable-speed constant-frequency
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