【摘要】 不对称故障时,对于撬棒(Crowbar)保护的双馈风机(DFIG)暂态特性分析较少,且传统的分析往往忽略了定子电阻,或不考虑定、转子磁链之间作用,导致DFIG暂态特性分析与计算存在误差。本文充分考虑以上可能存在的影响因素,推导了不对称故障下定、转子暂态短路电流和磁链精确解析表达式,利用仿真验证了短路解析计算表达式的准确性。并在此基础上,分析了主要特征量对暂态特性的影响。更多还原

【Abstract】 For the asymmetrical short-circuit fault,the short circuit current contribution of double-fed wind turbines(DFIG) has not received much attention so far. Usually,the stator resistance or the relation between the stator and rotor flux is neglected in traditional study,resulting in the presence of errors in transient characteristic analysis and calculation. Based on positive and negative sequence vector model of DFIG with space vector theory and sequence component method,the accurate mathematical expressions of the transient stator and rotor flux and short-circuit current are derived at the moment that asymmetric fault occurs,of which the transient characteristics are analyzed simultaneously. Finally,the mathematical expressions of stator current are verified according to the standard DFIG model in Matlab/Simulink.更多还原