一种中点电位平衡控制和共模电压抑制策略  

A strategy of neutral-point potential balance control and common-mode voltage suppression

作　　者：王克智[1] 赵文瀚[2] 王韬[1] 杨刚[1] 程国栋[3] 耿乙文[2] 

机构地区：[1]山西潞安环保能源开发股份有限公司,山西长治046204 [2]中国矿业大学信息与电气工程学院,江苏徐州221008 [3]中国矿业大学徐海学院,江苏徐州221008

出　　处：《工矿自动化》2014年第9期90-93,共4页Journal Of Mine Automation

基　　金：潞安集团科技计划资助项目(2012-环-Y-O3)

摘　　要：针对变频器通过长电缆对电动机供电过程中同时存在共模电压、过电压和中点电位不平衡的问题,分析了共模电压与过电压的产生机理,以及中点电位不平衡对共模电压的影响;提出了一种中点电位平衡控制和共模电压抑制策略,即在传统三电平逆变器基础上增加第四桥臂,通过控制第四桥臂的电流来控制中点电位平衡,通过优化主电路的SVPWM调制策略抑制共模电压。Matlab仿真实验验证了该策略的有效性。For problems that there are common-mode voltage, over voltage and neutral-point potential imbalance simultaneously in power supply of inverter to motor through long cable, generation mechanisms of common-mode voltage and over voltage were analyzed as well as effect of neutral-point potential imbalance on common-mode voltage. A strategy of neutral-point potential balance control and common- mode voltage suppression was proposed, namely adding the fourth leg to traditional three-level inverter, controlling current of the fourth leg to realize neutral point potential balance and optimizing SVPWM modulation strategy of main circuit to restrain common-mode voltage. Effectiveness of the strategy is verified by Matlab simulation.

关 键 词：变频器 长电缆输电 共模电压 过电压 中点电位平衡 

分 类 号：TD60[矿业工程—矿山机电]