交流励磁脉冲电压占空比对双馈型变速抽蓄电机转子绕组放电特性影响研究  

Study on Effect of AC Excitation Pulse Voltage Duty Cycle on Discharge Characteristics of Rotor Windings of Doubly-fed Variable Speed Pumped Storage Motor

作　　者：孙士涛[1] 雷雨[1] 郝国文 卢毅[1] 刘金栋 宋兆新 张杰[1] SUN Shitao;LEI Yu;HAO Guowen;LU Yi;LIU Jindong;SONG Zhaoxin;ZHANG Jie(North China Electric Power Research Institute Co.,LTD.,Beijing 100045,China;State Grid Xinyuan Company LTD.,Beijing 100052,China;Hebei Fengning Pumped Storage Co.,LTD.,Chende Hebei 068350,China)

机构地区：[1]华北电力科学研究院有限责任公司,北京100045 [2]国网新源集团(控股)有限公司,北京100052 [3]河北丰宁抽水蓄能有限公司,河北承德068350

出　　处：《微电机》2024年第9期41-46,共6页Micromotors

摘　　要：双馈型变速抽水蓄能电机是新型电力系统中极为重要的组成部分,其采用交流励磁低频PWM脉冲电压供电,其中占空比作为PWM技术的重要参数,对电机绝缘产生一定的影响,研究方波占空比对变速抽水蓄能电机转子绕组放电特性的影响规律,有利于变速抽水蓄能机组的绝缘性能评估。以某变速抽水蓄能机组为研究对象,建立转子绕组有限元模型,基于有限元仿真平台仿真并分析了不同方波占空比下转子绕组绝缘薄弱区域的电场电势特性,并搭建3 kV转子绕组局部放电试验平台,分析了不同占空比方波电压作用下绕组局部放电特性。Doubly-fed variable-speed pumped storage motor is a very important part of the new power system,which is powered by AC excitation and low-frequency PWM pulse voltage,in which the duty cycle,as an important parameter of the PWM technology,has a certain impact on the insulation of the motor,and the study of the square-wave duty cycle impact on the discharge characteristics of the rotor winding of the variable-speed pumped storage motor is conducive to the evaluation of the insulation of the variable-speed pumped storage unit.Taking a variable-speed pumped storage unit as the research object,a finite element model of the rotor winding was established,and the electric field potential characteristics of the rotor winding insulation weak area under different square wave duty cycles were simulated and analyzed based on the COMSOL finite element simulation platform,and a 3 kV rotor winding partial discharge test platform was set up to analyze the partial discharge characteristics of the rotor winding under the action of square wave voltages with different duty cycles.

关 键 词：变速抽水蓄能 占空比 转子绕组 局部放电 

分 类 号：TM303[电气工程—电机]