计及LVRT控制的直驱风电机组三相短路故障特性研究

Research of Three-phase Short-circuit Fault Characteristics for Direct-driven Wind Turbine with Low-voltage Ride-through Capability

直驱风力发电机由于其优越性成为了主流机型并广泛应用于风电场,而其具备低电压穿越能力后故障特征将发生很大变化,目前对此尚无系统的研究。研究分析了直驱风电机组的数学模型和控制策略,在此基础上结合提出的LVRT方法搭建了直驱风电场仿真模型,验证了其低电压穿越能力,并仿真对比分析了计及低穿控制策略下的机组三相短路故障特性,研究了影响其三相短路故障特性的相关因素。指出风电场中以电流大小为动作判据的涉网保护在配置整定时需要考虑上述因素的影响。

Direct - driven wind turbine generator is widely used in wind fatal because of its superiority. Its fault characteristics will be changed greatly because of low - voltage ride - through （LVRT） capability, but there is no systematic analysis and re- search about it. The PMSG topologystructure and control strategy- are studied and analyzed. The direct - driven wind fatal model is established in PSCAD platform to verifyits LVRT capability, and its three - phase short - circuit fault characteristics are simulated and compared considering LVRT strategy. The relevant factors that affect the three - phase short - circuit fault characteristics also are analyzed. It is pointed out that the above - mentioned factors need to be considered in the protection setting.