双馈型变速抽水蓄能电机转子绕组端部电应力特性研究  

Study on the Electrical Stress Characteristics of the Rotor Winding Ends of Doubly-fed Variable-speed Pumped Storage Motors

作　　者：刘金栋 宋兆新 赵人正 王志远 孙士涛[2] 雷雨[2] LIU Jindong;SONG Zhaoxin;ZHAO Renzheng;WANG Zhiyuan;SUN Shitao;LEI Yu(Hebei Fengning Pumped Storage Energy Co.,Ltd.,Chengde 068350,China;North China Electric Power Research Institute Co.,Ltd.,Beijing 100045,China)

机构地区：[1]河北丰宁抽水蓄能有限公司,河北承德068350 [2]华北电力科学研究院有限责任公司,北京100045

出　　处：《大电机技术》2025年第1期38-47,共10页Large Electric Machine and Hydraulic Turbine

基　　金：国网新源集团有限公司科技项目(SGXYKJ-2022-067)。

摘　　要：变速抽水蓄能是实现碳达峰、碳中和目标的重要技术,双馈型交流励磁电机可承担电网调峰调频任务,应对电网频率恶化问题,是构建新型电力系统的核心装备。针对低频电压作用下变速抽水蓄能电机转子绕组端部放电问题,本文首先基于COMSOL多物理场仿真软件建立转子绕组仿真模型,分析了低频及工频正弦电压下转子绕组端部电场电势分布。随后,对比分析了低频正弦与低频方波电压下的电场电势分布,并研究了不同工作条件下转子绕组端部的放电行为。研究结果表明,变速抽水蓄能电机转子绕组电场畸变处位于端部拐弯处,低频电压作用下绕组端部绝缘内部承受更大的电场力,且方波电压作用下转子绕组端部更容易发生局部放电,进而导致绝缘劣化。Variable-speed pumped storage is an important technology to realize the goal of carbon peaking and carbon neutrality,and doubly-fed AC-excited motors can undertake the task of grid peak shifting and frequency regulation to cope with the problem of deterioration of grid frequency,which is the core equipment for constructing a new type of power system.To address the problem of rotor winding end discharge of variable speed pumped storage motor under low frequency voltage,this paper firstly establishes a rotor winding simulation model based on COMSOL multiphysics field simulation software,and analyzes the potential distribution of the rotor winding end field under low frequency and industrial frequency sinusoidal voltage.Subsequently,the electric field potential distribution under low-frequency sinusoidal and low-frequency square-wave voltages was analyzed comparatively,and the discharge behavior of the rotor winding end under different operating conditions was studied.The results show that the electric field distortion of the rotor winding of the variable-speed pumped storage motor is located at the corner of the end,and the insulation at the end of the winding is subjected to a larger electric field force under the action of low-frequency voltage,and it is more likely to have a partial discharge at the end of the rotor winding under the action of the square-wave voltage,which will lead to the deterioration of the insulation.

关 键 词：双馈型变速抽水蓄能 转子绕组 局部放电 绝缘劣化 

分 类 号：TM303.4[电气工程—电机]