计及撬棒保护影响的双馈风力发电机组故障电流特性研究  

Study of Fault Current Characteristics of DFIG Considering Impact of Crowbar Protection

作　　者：孔祥平[1] 张哲[1] 尹项根[1] 王菲[1] 隆茂 

机构地区：[1]华中科技大学强电磁工程与新技术国家重点实验室,武汉430074

出　　处：《电工技术学报》2015年第8期1-10,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51177058;51077061)

摘　　要：为了研究对称及不对称电网故障情况下双馈风力发电机组的故障电流特性,建立了两相静止坐标系下双馈风力发电机组的动态模型。对近区严重故障且撬棒保护动作情况下双馈风力发电机组的定子绕组磁链动态过程进行了研究,提出了一种兼顾精确性和简易性的定子绕组磁链简化计算模型。以此为基础,对对称故障和不对称故障情况下双馈风力发电机组的故障电流特性进行了分析,得到了其解析表达式,建立了故障电流的等效计算模型。数字仿真结果表明,理论分析结果在故障发生后的前2个工频周期内具有很高的精确度,可以满足继电保护原理研究和整定计算的应用要求。In order to study the fault current characteristics of doubly-fed induction generator(DFIG) under symmetrical and asymmetrical fault conditions, dynamic model of DFIG in stator stationary reference frame is developed. On condition that a severe fault occurs and crowbar protection is activated, the dynamic characteristics of stator flux linkage of DFIG are studied. Moreover, a simplified calculation model of stator flux linkage is established with consideration of accuracy as well as simplicity. Based on it, the fault current characteristics DFIG under conditions of symmetrical faults and asymmetrical faults are analyzed and the analytical expressions are obtained. Besides, the equivalent calculation models of fault current are built. Finally, the digital simulation results show that the theoretical analysis results have high accuracy in the first two cycles after the fault occurs which can meet the requirements of the study of relaying protection principle and setting calculation.

关 键 词：双馈风力发电机组 撬棒保护 定子绕组磁链 故障电流特性 等效计算模型 

分 类 号：TM315[电气工程—电机]