永磁同步发电机匝间短路故障对绕组绝缘温升特性的影响  

Impact of inter-turn short fault on winding insulation temperature rising characteristic in PMSG

作　　者：何玉灵[1] 李勇[1] 张文[1] 白怡凡 徐明星 王晓龙[1] HE Yuling;LI Yong;ZHANG Wen;BAI Yifan;XU Mingxing;WANG Xiaolong(Department of Mechanical Engineering and Hebei Engineering Research Center for Advanced Manufacturing&Intelligent Operation and Maintenance of Electric Power Machinery,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学机械工程系暨电力机械装备先进制造与智能运维河北省工程研究中心,河北保定071003

出　　处：《电机与控制学报》2024年第4期18-30,共13页Electric Machines and Control

基　　金：国家自然科学基金(52177042);河北省自然科学基金(E2022502003);中央高校基本科研业务费专项基金(2023MS128);河北省第三批青年拔尖人才支持计划([2018]-27);河北省高层次人才资助项目(B20231006);苏州市社会发展科技创新项目(SS202134);河北省研究生创新能力培养资助项目(CXZZBS2023149)。

摘　　要：本文分析了永磁同步发电机匝间短路故障前后的绕组绝缘温升特性。首先推导了正常情况和匝间短路故障下的气隙磁通密度,相电流、铁心损耗和绕组铜耗解析表达式;然后建立了发电机三维有限元仿真模型,将电磁场中计算得到的各类损耗作为热源导入温度场计算绕组绝缘温度分布;最后实测了LR-5型故障模拟永磁同步发电机组在不同短路程度下的绕组绝缘温度,理论分析、仿真计算与实验结果相互吻合。结果表明:匝间短路故障后在故障绕组电流的作用下,绕组绝缘温度明显上升,并且随着短路程度的增加而加剧,由绕组绝缘热载荷分布不均而引起的变形、应变和应力也将增加;绕组鼻端处绝缘易因高温而受损,可通过改进冷却散热结构,或在鼻端绝缘局部涂覆耐热涂层提高鼻端绝缘的可靠性。The winding insulation temperature rising characteristic was investigated before and after interturn short circuit(ITSC)in permanent magnet synchronous generators(PMSG).Firstly,the magnetic flux density,stator current,core loss and copper loss expressions in normal and ITSC conditions were deduced.Then three dimensional finite element analysis(FEA)models were established.The varied types of loss were calculated in the electromagnetic filed and imported into the temperature field to obtain the temperature distribution of winding insulation.Finally,the experiments were taken on the LR-5 prototype PMSG to measure the winding insulation temperature.The experiment results are good accorded with the theoretical analysis and FEA results.It is shown that the winding temperature will increase significantly acted by the shorted winding current under ITSC fault.The server ITSC fault degree is intensified,the higher winding insulation temperature will be.In addition,the deformation,strain and stress resulting from the uneven distribution of thermal load on the winding insulation will also intensify.The insulation at the nose end of the winding is prone to damage due to high temperatures.This can be addressed by im-proving the cooling and heat dissipation structure or applying a heat-resistant coating to enhance the relia-bility of the insulation at the nose end.

关 键 词：永磁同步发电机 绕组绝缘 匝间短路 温升特性 危险位置 

分 类 号：TM31[电气工程—电机]