双馈风力发电机转子绕组故障的试验研究  

Experimental Study on Rotor Winding Faults of Doubly-Fed Induction Generator

作　　者：李思源 马宏忠[1] LI Siyuan;MA Hongzhong(College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学能源与电气学院,江苏南京211100

出　　处：《电机与控制应用》2018年第10期120-125,共6页Electric machines & control application

摘　　要：在实际生产中,双馈风力发电机(DFIG)转子绕组状态监测能有效提高风电机组的运行可靠性。为研究DFIG转子绕组运行故障试验方案,首先介绍试验平台的基本原理、现场试验装置及搭建过程中主要问题的解决方法;然后以变换器网侧电流作为研究对象,分析故障特征信息流经变流器电力电子器件的传播规律,基于电流频谱提取转子绕组发生不平衡故障的诊断依据;最后基于获取的转子绕组三相不对称负载故障运行前后的转子绕组电流频谱图,可分析转子侧电气量故障特征频率。依据试验结果将转子变换器网侧电流频谱中的100 Hz、200 Hz和几个特征频率边频分量作为转子绕组不平衡故障的诊断依据;将3sf和(2±3s) f(s为转差率,f为基频)作为转子三相负载不对称故障的特征频率,具有一定的试验指导性和工程意义。In actual production,the rotor winding state monitoring of doubly-fed induction generator(DFIG)could effectively improve the operation reliability of wind turbine.The complete experimental program for research on rotor winding fault of DFIG was provided.Firstly,the basic principle and field experimental devices of the experimental platform,as well as the solutions to problems in the process of platform building were introduced so as to ensure the accuracy of experimental data.Then,taking the converter side current as the research object,we analyzed the propagation of fault information through the power converter electronic device,and extracted the diagnostic characteristics of rotor winding unbalance fault based on current spectrum.Finally,the current spectra of rotor windings before and after the unbalance fault caused by three-phase unbalance loads were obtained by experiments,and,in combination with the theory of electrical fault characteristic frequency on the rotor side,the fault characteristic frequencies were analyzed.According to the experimental results,100 Hz,200 Hz and several characteristic frequency components of rotor converter side current spectrum were selected as the diagnostic characteristics of the rotor winding unbalance fault.It was significant to take 3 sf and(2±3 s)f(s:slip ratio;f:fundamental frequency)as the characteristic frequencies of rotor three-phase unbalance load fault in engineering and experiments.

关 键 词：双馈风力发电机 传播规律 不对称运行 特征频率 

分 类 号：TM315[电气工程—电机]