多相环形无刷励磁机定子过电压机理分析  

Mechanism Analysis of Stator Overvoltage in Multi-phase Angular Brushless Exciter

作　　者：章良健 王燚 常江 吴龙[3] 王光[3] 李华忠[3] 郝亮亮[2] ZHANG Liangjian;WANG Yi;CHANG Jiang;WU Long;WANG Guang;LI Huazhong;HAO Liangliang(Taizhou Power Plant,Taizhou 318016,China;School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China;NR Electric Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]台州发电厂,浙江台州318016 [2]北京交通大学电气工程学院,北京100044 [3]南京南瑞继保电气有限公司,南京211102

出　　处：《大电机技术》2021年第6期34-39,共6页Large Electric Machine and Hydraulic Turbine

基　　金：浙江省能源集团有限公司2019年科技项目:无刷励磁机定子过电压机理及定子绕组内部故障保护关键技术研究与应用(ZNKJ-2019-047)。

摘　　要：为研究台州电厂11相环形无刷励磁机定子过电压事故,本文首先介绍了励磁机定子绕组接地故障并进一步引发定子过电压事故的经过,并以一般m相P对极无刷励磁机为理论分析对象,从故障时定、转子绕组产生的磁场及其相互感应入手,明确了定子过电压产生的机理。对台州11相无刷励磁机进行定子过电压的仿真分析,对稳态励磁电流波形进行傅里叶分析及定子过电压的量化计算。理论分析及仿真计算均表明:定子过电压中仅含有m/P倍次谐波分量,且定子过电压量化计算结果与事故录波结果接近,验证了上述机理分析的正确性,同时也为核电定子过电压保护的研究提供了理论依据。In order to study the stator over-voltage accident of 11 phase annural brushless exciter in Taizhou Power Plant.This paper introduces the process of the stator winding grounding fault of exciter which causes the stator over-voltage accident.Taking the general m phase P pair-pole brushless exciter as the theoretical analysis object and starting with the magnetic field and mutual induction produced by the stator and rotor windings at the time of fault,the mechanism of the stator over-voltage is clarified.The stator over-voltage of Taizhou 11 phase brushless exciter is simulated and analyzed.The steady-state excitation current waveform is analyzed by Fourier transform and the stator overvoltage is calculated quantitatively.Theoretical analysis and simulation calculation show that the stator over-voltage only contains m/P times harmonic component.The results of quantitative calculation of stator over-voltage are close to the results of accident measurement,which verifies the correctness of the above mechanism analysis.Meanwhile,it also provides a theoretical basis for the research of nuclear power stator over-voltage protection.

关 键 词：无刷励磁 定子过电压 励磁故障 分数次谐波 仿真计算 

分 类 号：TM307.1[电气工程—电机]