摘要
对于长电缆馈电的中压电驱系统,当电机浪涌阻抗和电缆特征阻抗不匹配时,变频器产生的高频脉宽调制脉冲电压会在电机端发生反射,导致严重的过电压振荡,从而加速电机绕组和电缆的绝缘老化甚至破坏绝缘。目前主流的无源滤波器抑制方案存在体积巨大,损耗高,额外成本以及灵活性差的缺点。为此,针对级联H桥变频器提出一种准2N+1电平调制方案,其抑制原理是通过在变频器输出电压的每个上升/下降沿插入固定宽度的准电平从而消除电缆上的反射波,达到抑制过电压振荡的目的。最后,通过仿真及实验验证所提出方案的有效性,与现有的抑制方案相比,系统的效率显著提升,并且无需附加任何组件,避免了额外的体积和成本。
For medium-voltage long-cable-fed motor drives,the inverter high-frequency pulse width modulation(PWM)pulse voltage will reflect at the motor terminal when the motor surge impedance and cable characteristic impedance do not match,causing serious overvoltage oscillation and damage to the motor winding and insulation.The mainstream passive-filter schemes have drawbacks such as large volume,high losses,additional costs,and poor flexibility.Thus,this article proposes a quasi 2N+1 level modulation scheme for cascaded H-bridge(CHB)inverters,which can eliminate reflected waves on the cable and achieve overvoltage oscillation suppression by inserting the fixed-width quasi level at each rising/falling edge of the inverter output voltage.Finally,the proposed scheme is verified through simulation and experimentation.Compared with existing suppression schemes,the system efficiency is significantly improved,and no additional components are required,avoiding additional volume and cost.
作者
朱艳萍
张赛宇
张敏
赵巍
李昕
孙孝峰
ZHU Yanping;ZHANG Saiyu;ZHANG Min;ZHAO Wei;LI Xin;SUN Xiaofeng(Key Lab of Power Electronics for Energy Conservation and Drive Control of Hebei Province(School of Electrical Engineering,Yanshan University),Qinhuangdao 066004,Hebei Province,China)
出处
《中国电机工程学报》
北大核心
2025年第10期4018-4033,I0038,共17页
PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING
基金
河北省自然科学基金(重点项目)(E2021203162)
河北省科学技术研究与发展计划(236Z2101G)。
关键词
长电缆
反射
过电压振荡
电机驱动
级联H桥
long cable
reflection
overvoltage oscillation
motor drives
cascaded H-bridge(CHB)
