基于坐标变换的双馈风力发电机组叶片质量不平衡故障诊断  

Fault Diagnosis for Blade Mass Imbalance of Wind Turbines with DFIG Based on Coordinate Transformation

作　　者：绳晓玲[1,2] 万书亭[2] 李永刚[1] 成立峰[2] 

机构地区：[1]华北电力大学电气与电子工程学院,保定071003 [2]华北电力大学能源动力与机械工程学院,保定071003

出　　处：《电工技术学报》2016年第7期188-197,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51177046);中央高校基本科研业务费专项资金(12MS101;2014XS82)资助

摘　　要：首先分析了叶片质量不平衡故障时双馈风力发电机组的电气特性,提出了基于dq坐标变换规则的定、转子电流特性分析法;然后采用希尔伯特解调法对电流信号进行处理,突出了电流的故障频率;最后在Matlab/Simulink环境下进行了仿真,并在双馈风力发电机组实验平台上进行了验证。结果表明,叶片质量不平衡故障时,发电机定、转子电流中都包含故障频率——叶片转频,该方法在叶片不平衡故障的识别中是有效的,具有一定的工程应用价值。Firstly,the electrical characteristics of the doubly-fed induction generator（ DFIG） under the blade imbalance fault are analyzed. Furthermore,the stator and rotor currents can be obtained according to the dq coordinate transformation. Then the Hilbert demodulation method is used to process the current signal so that the fault frequency can be highlighted. Finally,the simulation work under Matlab / Simulink and the experiment on the DFIG testing platform are taken for verification. It is shown that,the faulty stator and rotor currents contain the same harmonic component as that of the blade＇s rotating frequency. The proposed method is effective to recognize the blade mass imbalance fault and therefore has an engineering application potential.

关 键 词：双馈风力发电机组 叶片 质量不平衡 定、转子电流 坐标变换 

分 类 号：TM315[电气工程—电机]