隐极同步发电机转子匝间短路时转子不平衡磁拉力特征分析

发布时间：2018-03-20 19:12

本文选题：隐极同步发电机　切入点：转子匝间短路　出处：《电力系统自动化》2016年03期 　论文类型：期刊论文

【摘要】：考虑到转子匝间短路会在定子回路产生与极对数和定子绕组形式有关的偶数次和分数次不平衡电流分量,首先基于不平衡电流谐波分量产生的各次谐波磁动势,推导了转子在定子直角坐标系中不平衡磁拉力(UMP)的表达式,并根据故障时定、转子磁动势的特点,得到了故障后UMP的频率分量表达形式,形成了一套完整的故障时UMP特征分析方法。用该方法对不同极对数的隐极发电机样机转子匝间短路故障进行了分析,并通过基于ANSOFT软件的场路耦合计算得到了故障中转子电磁力的数值结果。仿真结果符合理论分析的UMP特征,验证了所提出的转子受力分析方法的正确性。理论分析与仿真结果均表明,不同极对数和定子绕组形式的发电机故障时转子UMP的谐波特征不同,为机电信息融合的转子匝间短路故障监测奠定了基础。
[Abstract]:Considering that the inter-turn short circuit of the rotor produces even and fractional unbalanced current components in the stator loop related to the logarithm of the poles and the form of the stator windings, the first step is based on the harmonic magnetic EMF generated by the harmonic component of the unbalanced current, The expression of unbalanced magnetic pull force (UMP) of rotor in stator rectangular coordinate system is derived. According to the characteristics of fault timing and rotor magnetic EMF, the expression of frequency component of UMP after fault is obtained. In this paper, a complete method of UMP characteristic analysis for fault is developed, and the inter-turn short circuit fault of the rotor of different pole logarithm is analyzed by using this method. The numerical results of the rotor electromagnetic force in the fault are obtained by the field circuit coupling calculation based on ANSOFT software. The simulation results accord with the UMP characteristics of the theoretical analysis. The theoretical analysis and simulation results show that the harmonic characteristics of rotor UMP are different with different pole logarithms and stator windings. It lays a foundation for rotor interturn short circuit fault monitoring based on electromechanical information fusion.
【作者单位】：北京交通大学电气工程学院;清华大学电机工程与应用电子技术系;电力系统及发电设备控制和仿真国家重点实验室清华大学;
【基金】：国家自然科学基金资助项目(51307005) 中央高校基本科研业务费专项资金资助项目(2015YJS149;KEJB15016536;KERC14003536)~~
【分类号】：TM31

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