级联型高压变频器死区效应分析  

Analysis of dead-time effect in cascaded multi-level medium-voltage inverters

作　　者：陈锐[1] 尹项根[1] 王志华[1] 

机构地区：[1]华中科技大学电气与电子工程学院,湖北武汉430074

出　　处：《电力自动化设备》2003年第8期33-37,共5页Electric Power Automation Equipment

摘　　要：设计电压型PWM变频器时死区时间的设定会造成输出谐波增加、负载电动机转矩脉动,严重时甚至引起电动机震荡。针对电压胞级联型结构的高压变频器,通过理论推导和仿真分析,较为详细的探讨了其死区效应的特点和影响因素。研究证明,电压胞级联型高压变频器死区效应与电压胞个数无关,随频率调制比和死区时间的变化而同步变化,且总的看来死区的影响不很严重,但从高性能调速的角度,适当的死区补偿也是必要的。In the design of voltage PWM inverter,the existence of dead-time will arouse the in-crease of output harmonic,the pulsation of the motor torque,and even the oscillation of the motor.The dead-time effect on the cascaded multi-level medium-voltage inverters and its affection factors are discussed by theoretic calculation and simulated analysis.The research reveals that the dead-time effect of the cascaded multi-level medium-voltage inverter has nothing to do with the number of multi-cascaded power-cell,but varies synchronously with the altering of the frequency modulation ratio and dead-time.The result also shows that the dead-time effect is not serious,but the appro-priate dead-time compensation is necessary for better performance of the inverters.

关 键 词：高压变频器 死区效应 仿真分析 

分 类 号：TM73[电气工程—电力系统及自动化] F123.13[经济管理—世界经济]