基于转子平均瞬时功率的双馈异步发电机定子绕组匝间短路故障诊断  

Diagnosis of stator winding inter-turn short circuit in DFIG based on instantaneous average power in rotor side

作　　者：马宏忠[1] 张艳[1] 魏海增 付明星 黄春梅[1] MA Hongzhong,ZHANG Yan, WEI Haizeng, FU Mingxing, HUANG Chunmei(College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, Chin)

机构地区：[1]河海大学能源与电气学院,江苏南京211100

出　　处：《电力自动化设备》2018年第4期151-156,共6页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51577050)

摘　　要：由于双馈异步发电机转子参数的可测性,提出一种基于转子平均瞬时功率的定子绕组匝间短路故障诊断方法。首先推导出计及高次谐波的双馈异步发电机正常及发生定子绕组匝间短路故障时的转子平均瞬时功率的表达式,然后建立了双馈异步发电机的多回路数学模型,并对其正常和不同程度匝间短路故障时的转子平均瞬时功率进行仿真计算。对仿真结果进行频谱分析,得到定子绕组匝间短路故障前后转子平均瞬时功率谐波分量的变化规律,并验证了理论分析的正确性。分析结果表明转子平均瞬时功率谱直观简洁,其2倍频分量不受转差率影响,高次谐波分量对定子绕组匝间短路故障有较强的灵敏性。A method of stator winding inter-turn short circuit diagnosis for DFIGs （ Doubly-Fed Induction Generators） is proposed due to the measurability of rotor parameters of DFIGs. With the consideration of high-order harmonic, the expressions of instantaneous rotor average power in conditions of normal and stator winding inter-turn short circuit are deduced, then the multi-loop mathematical model of DFIGs is established, and the simulation calculation of rotor ave- rage instantaneous power in conditions of normal and stator winding inter-turn short circuit in different degrees is car- ried out. The variation of harmonic component of instantaneous rotor average power is obtained by the spectrum anal- ysis of simulative results, which verifies the correctness of theoretical analysis. The results also show that the rotor ave- rage instantaneous power spectrum is intuitional and simple, the 2hal-order harmonic components are not affected by slip ratio and the high-order harmonic components have strong sensitivity to stator winding inter-turn short circuit.

关 键 词：双馈异步发电机 转子平均瞬时功率谱 定子匝间短路 多回路法 频谱分析 

分 类 号：TM774[电气工程—电力系统及自动化]