并网双馈感应风电机短路故障特性的仿真研究

摘要

Study the fault characteristics of doubly - fed induction wind generator ( DFIG). Since that the influence of converter control system on grid fault is non - negligible, on the basis of the transient process of grid DFIG under short - circuit fault, this paper derived the short circuit current dynamic expression of DFIG with the influence of the rotor converter output on rotor circuit considered. Then symmetrical short - circuit current characteristics of DFIG were analyzed and the effect of the control parameters of the rotor side converter on symmetrical short - circuit current characteristics were found. Finally, PSCAD/EMTDC was used for the simulation analysis. The simulation results show the influence of DFIG converter control system on grid fault characteristics, and it provides a foundation for the fault diagnosis and analysis of wind power system.%研究并网双馈感应风电机短路故障特性.由于变流器控制系统对故障特性的影响不可忽视,所以为了更为准确地分析诊断系统故障以保证系统的安全运行,从DFIG短路故障时的暂态过程出发,在考虑转子电流动态特性的情况下提出了DFIG对称短路电流的动态表达式,进而对短路故障电流的特性进行了分析,并利用PSCAD/EMTDC平台进行了仿真分析.仿真结果表明了DFIG变流器控制系统对短路故障特性的影响,为风电系统的故障分析诊断提供了一定的依据.