双馈风力发电机转子绕组不平衡故障诊断  

Unbalanced fault diagnosis of rotor winding in doubly-fed induction generator

作　　者：马宏忠[1] 李思源 MA Hong-zhong;LI Si-yuan(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,南京211100

出　　处：《电机与控制学报》2020年第2期138-143,共6页Electric Machines and Control

基　　金：国家自然科学基金(51577050,51177039);111引智计划资助(B14022)。

摘　　要：提出一种针对双馈风力发电机转子绕组外接电路且自身携带变频器构造的初期不平衡故障诊断新方法。以定子瞬时功率信号为研究对象,首先理论推导该量在转子绕组不平衡时的故障特征频率并搭建PSCAD仿真模型验证可行性;为进一步证明研究对象的诊断优势,通过动模实验比较同程度故障前后转子电流与定子瞬时功率对应特征频率的幅值变化;最后为优化诊断结果,利用小波能量谱计算定子瞬时功率故障特征频带能量占整个信号能量的比值。结果表明,该比值在诊断双馈风力发电机转子绕组初期不平衡故障时具有很高的灵敏度和可靠性。The doubly-fed induction generator rotor winding links to an external circuit and carries its own frequency converter,and considering this structure,a method for initial unbalanced fault diagnosis of rotor winding of the doubly-fed induction generator is proposed.This method took the instantaneous power signal of the stator as the research object.Firstly,theory was applied to deduce the characteristic frequency of the fault when the rotor winding was unbalanced,and a PSCAD simulation model was built to verify the feasibility.In order to further prove the advantages of the diagnosis research object,the dynamic simulation experiment was implemented to compare the failure of the rotor current and stator instantaneous power corresponding to the amplitude of the characteristic frequency before and after the same degree of fault.Finally,with the intention of optimizing the diagnostic results,wavelet energy spectrum was used to calculate the stator instantaneous power failure characteristic band energy to the signal energy ratio.The results show that this ratio has high sensitivity and reliability in the diagnosis of initial unbalanced rotor winding faults in the doubly-fed induction generator.

关 键 词：双馈风力发电机 定子瞬时功率 小波能量谱 转子绕组 不平衡故障 

分 类 号：TM343[电气工程—电机]