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| 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。 |
| 关键词: 高压变频器 死区效应 仿真分析 |
| DOI： |
| 分类号:TM73 F123.13 |
| 基金项目: |
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| Analysis of dead-time effect in cascaded multi-level medium-voltage inverters |
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CHEN Rui YIN Xiang-gen WANG Zhi-hua
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| Abstract: |
| 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. |
| Key words: medium-voltage converter,dead-time effect,simulated analysis |
