不平衡电压下基于负序电流法的双馈感应发电机定子绕组匝间短路故障仿真研究

发布时间：2018-02-01 17:21

本文关键词： 多回路双馈异步发电机不平衡电压负序电流匝间短路故障诊断　出处：《电机与控制应用》2016年11期 　论文类型：期刊论文

【摘要】：定子负序电流是电压平衡情况下双馈感应发电机定子绕组匝间短路故障特征量之一,但实际中三相电压不可能完全对称,由不对称电压产生的负序电流会影响负序电流的大小。鉴于此,如不考虑电压不平衡的影响单纯从负序电流大小判别故障容易误判。当定子发生绕组匝间短路故障时,总的负序电流由不对称电压产生的负序电流分量及定子绕组匝间短路引起的负序电流分量构成。运用多回路理论建立数学仿真模型仿真电压平衡及电压不平衡情况下发生定子绕组匝间短路几种情况,得到电压和电流的基波分量,运用负序阻抗法排除由电压不平衡产生负序电流的影响,得到仅由故障引起的负序电流。仿真结果表明,故障引起的负序电流小于总的负序电流。
[Abstract]:The stator negative sequence current is one of the characteristics of inter-turn short circuit fault in the stator windings of a doubly-fed induction generator under the condition of voltage balance, but in practice the three-phase voltage can not be completely symmetrical. The negative sequence current generated by the asymmetric voltage affects the size of the negative sequence current. If the influence of voltage imbalance is not considered, it is easy to misjudge the fault simply from the magnitude of negative sequence current. The total negative sequence current is composed of the component of negative sequence current produced by asymmetric voltage and the component of negative sequence current caused by inter-turn short circuit of stator winding. The mathematical simulation model of multi-loop theory is established to simulate the voltage balance and voltage imbalance. Under the condition of stator winding inter-turn short circuit occurred in several situations. The fundamental components of voltage and current are obtained, and the negative sequence current caused only by fault is obtained by using the negative sequence impedance method. The simulation results show that the negative sequence current is caused only by the fault. The negative sequence current caused by the fault is less than the total negative sequence current.
【作者单位】：华北电力大学电气与电子工程学院;
【基金】：河北省自然科学基金资助项目(2014502015)
【分类号】：TM315
【正文快照】： 0 引言风能是一种清洁、廉价、储量极为丰富的可再生能源[1]。现如今风力发电技术在新能源领域较为成熟。双馈感应发电机(Doubly Fed Induction Generator,DFIG)是风力系统中主流机型,据统计,在风力发电机常见故障中,绕组发生故障概率高达12.89%,且定子绕组匝间短路故障是其

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