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

摘要:

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。

Abstract:

Direct － driven wind turbine generator is widely used in wind farm 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 research about it． The PMSG topology structure and control strategy are studied and analyzed． The direct － driven wind farm model is established in PSCAD platform to verify its 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．