不平衡电压下双馈感应电机定子绕组匝间短路故障诊断研究

发布时间：2018-06-25 00:18

本文选题：双馈感应发电机 + 定子绕组匝间短路　；参考：《华北电力大学》2017年硕士论文

【摘要】：目前,双馈感应发电机作为风力发电主要机型之一受到了人们的重视,由于双馈感应发电机所处运行环境恶劣,加之机组长时间运行,出现故障的概率较大,其中定子绕组匝间短路故障是导致绕组故障主要原因之一,且该类故障发生的几率较大,如不能及时有效的诊断出该故障,将会对电机本身造成巨大的损害。现阶段,针对双馈感应电机定子绕组匝间短路故障的诊断主要通过监测电气量及非电气量故障前后的变化两方面进行研究。但这些方法大部分是在电网电压平衡的条件下进行的,对不平衡电压下双馈感应发电机发生定子绕组匝间短路故障的诊断研究较少。本文以多回路理论为基础,建立了电压平衡及不平衡情况下双馈感应发电机定子绕组发生与未发生匝间短路故障的数学模型。介绍了负序视在阻抗的概念及其推导过程,分析负序分量的来源,并从理论分析上得到电压不平衡绕组正常及电压平衡情况下定子绕组匝间短路故障时双馈感应发电机转子相电流的频谱特征,并对上述两种情况及不平衡电压下发生定子绕组匝间短路故障进行了仿真。使用向量图解法对仿真所得数据进行处理求得相关负序分量,对仿真得到的相电流进行波形分析,并运用定子相电流波形图与转子相电流频谱分析相结合方法、负序视在阻抗法及负序电流法研究不平衡电压下双馈感应发电机定子绕组匝间短路故障。仿真结果验证了上述三种方法的正确性,为进一步研究不平衡电压下双馈感应电机定子绕组故障的诊断方法提供了一定的参考价值。
[Abstract]:At present, the doubly-fed induction generator, as one of the main wind power generation models, has been paid attention to. Due to the poor operating environment of the doubly-fed induction generator and the long-term operation of the unit, the probability of failure is high. The stator winding inter-turn short circuit fault is one of the main causes of winding fault, and the probability of this kind of fault is great. If the fault can not be diagnosed in time and effectively, it will cause great damage to the motor itself. At present, the diagnosis of stator winding inter-turn short circuit fault of doubly-fed induction motor is mainly studied by monitoring the change of electrical quantity and non-electrical quantity fault. However, most of these methods are carried out under the condition of voltage balance of power network, and the diagnosis of stator winding inter-turn short circuit fault of doubly-fed induction generator under unbalanced voltage is less studied. Based on the theory of multi-loop, the mathematical model of stator windings of doubly-fed induction generator with or without inter-turn short circuit is established under the condition of voltage balance and unbalance. The concept and derivation process of negative sequence apparent impedance are introduced, and the source of negative sequence component is analyzed. The spectrum characteristics of rotor phase current of doubly-fed induction generator under the condition of normal voltage unbalanced winding and voltage balanced inter-turn short circuit fault are obtained from theoretical analysis. The fault of inter-turn short circuit in stator winding is simulated under the above two conditions and unbalanced voltage. The vector diagram method is used to process the simulation data to obtain the negative sequence component, and the waveform of the phase current is analyzed, and the stator phase current waveform diagram is combined with the rotor phase current spectrum analysis method. The fault of inter-turn short circuit in stator windings of doubly-fed induction generator under unbalanced voltage is studied by impedance method and negative sequence current method. The simulation results verify the correctness of the above three methods and provide a certain reference value for further research on the fault diagnosis of stator windings of doubly-fed induction motors under unbalanced voltage.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM315

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