电网电压不对称骤升时双馈风力发电机定子磁链暂态全过程及控制策略研究  

Study on Transient Whole-process and Control Strategy of Stator Flux in Doubly-fed Induction Generator with Asymmetric Voltage Swell

作　　者：孙丽玲[1] 王艳娟 SUN Liling;WANG Yanjuan(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学电气与电子工程学院

出　　处：《高电压技术》2019年第7期2160-2166,共7页High Voltage Engineering

基　　金：国家自然科学基金(51277077)~~

摘　　要：目前有关双馈风力发电机(DFIG)高电压穿越问题的研究大多集中于对电网电压骤升期间定子磁链暂态特性的分析,忽略了故障恢复后定子磁链的动态变化。因此,对电网电压不对称骤升故障和在不同持续时间下的定子磁链暂态全过程进行了理论推导;针对传统"灭磁"控制需对相序进行分离的复杂性,提出了一种无需磁链观测和系统参数的反向电流追踪控制策略。仿真结果验证了理论分析的正确性,所提控制策略加快了暂态磁链的衰减速度,抑制了电磁转矩的脉动。Conventional studies on the high voltage ride through problem of doubly fed induction generator(DFIG)usually focus on the transient characteristics during voltage swell faults and ignore dynamic changing of stator flux linkage after fault recovery. We studied the electromagnetic transient whole-process at grid voltage asymmetric swell and fault removal. To analyze the complexity of phase sequence separation for traditional de-excitation control, a reverse current tracking control strategy without flux linkage and system parameters is proposed. The simulation results verify the correctness of the theoretical analysis. The proposed control strategy accelerates the decay rate of the transient flux and suppresses the pulsation of the electromagnetic torque.

关 键 词：定子磁链 暂态全过程 高电压穿越 持续时间 控制策略 

分 类 号：TM315[电气工程—电机]