基于层叠载波调制的三电平H桥变频器输出电压异常跳变分析研究
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摘要
推进变频器输出电压电平跳变幅值的增大,将对电机绕组绝缘及振动噪声性能产生影响。首先,该文对基于层叠载波调制的三电平H桥拓扑的推进变频器输出电压跳变异常现象,进行理论及仿真分析;其次,查明其产生机理,并确定其发生的条件是H桥单元左右半桥同时换流所致;然后,通过对H桥左右半桥控制调制波注入零序分量,避免了左右半桥同时换流导致的输出电压跳变异常问题。最后,通过仿真和实验验证所提方法的正确性、有效性。该文研究可为H桥拓扑推进变频器优化输出电压谐波,避免输出电压异常跳变提供一种解决思路。
The increase of the inverter output voltage pulses magnitude will affect the insulation and vibration noise performance of the motor. Firstly, the paper presented the analytical and simulation analysis of the abnormal inverter output voltage pulses produced by the three-level H-bridge inverter. Secondly, the mechanism for abnormal voltage pulses was found to be simultaneous commutation of both left and right bridge legs of the H-bridge inverter. Third, by injecting zero sequence components to the modulation wave for the left and right bridge legs of H-bridge inverter, the problem of the occasional abnormal voltage pulses caused by the simultaneous commutation of the left and right half bridge legs was avoided. Finally, simulation and experimental results verified that the proposed method is effective in optimizing the output voltage harmonics of the h-bridge inverter and avoiding the abnormal output voltage pulses.
The increase of the inverter output voltage pulses magnitude will affect the insulation and vibration noise performance of the motor. Firstly, the paper presented the analytical and simulation analysis of the abnormal inverter output voltage pulses produced by the three-level H-bridge inverter. Secondly, the mechanism for abnormal voltage pulses was found to be simultaneous commutation of both left and right bridge legs of the H-bridge inverter. Third, by injecting zero sequence components to the modulation wave for the left and right bridge legs of H-bridge inverter, the problem of the occasional abnormal voltage pulses caused by the simultaneous commutation of the left and right half bridge legs was avoided. Finally, simulation and experimental results verified that the proposed method is effective in optimizing the output voltage harmonics of the h-bridge inverter and avoiding the abnormal output voltage pulses.
引文
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[15]尹靖元,金新民,梁建钢,等.独立直流母线双三电平中点嵌位式开绕组零序注入调制策略[J].电网技术,2016,40(8):2456-2463.Yin Jingyuan,Jin Xinmin,Liang Jiangang,et al.Zero sequence voltage injection modulation strategy of dual3L-NPC open-end winding with isolated DC link[J].Power System Technology,2016,40(8):2456-2463(in Chinese).
[16]王颖杰,许家斌,王亮,等.开绕组电机共直流母线双逆变器调制策略优化[J].中国电机工程学报,2016,36(20):5594-5604.Wang Yingjie,Xu Jiabin,Wang Liang,et al.The optimization of modulation strategy of dual inverter with common DC-link for open-end winding motor[J].Proceedings of the CSEE,2016,36(20):5594-5604(in Chinese).
[2]年珩,周义杰,李嘉文.基于开绕组结构的永磁风力发电机控制策略[J].电机与控制学报,2013,17(4):79-85.Nian Heng,Zhou Yijie,Li Jiawen.Control strategy of permanent magnet wind generator based on open winding configuration[J].Electric Machines and Control,2013,17(4):79-85(in Chinese).
[3]Reddy B V,Somasekhar V T,Kalyan Y.Decoupled space-vector PWM strategies for a four-level asymmetrical open-end winding induction motor drive with waveform symmetries[J].IEEE Transactions on Industrial Electronics,2011,58(11):5130-5141.
[4]王东,吴新振,郭云珺,等.非正弦供电十五相感应电机谐波电压确定[J].中国电机工程学报,2012,32(24):126-133.Wang Dong,Wu Xinzhen,Guo Yunjun,et al.Determination of harmonic voltages for fifteen-phase induction motors with non-sinusoidal supply[J].Proceedings of the CSEE,2012,32(24):126-133(in Chinese).
[5]Jouanne A,Enjeti P N.Design considerations for an inverter output filter to mitigate the effects of long motor leads in ASD applications[J].IEEE Transactions on Industry Applications,1997,33(5):1138-1145.
[6]李立毅,于吉坤,曹继伟,等.基于PWM逆变电路供电的永磁同步电机电压和电流的谐波通用型新算法[J].中国电机工程学报,2015,35(23):6203-6213.Li Liyi,Yu Jikun,Cao Jiwei,et al.A universal and new harmonic algorithm of voltage and current of permanent magnet synchronous motors supplied by PWM inverter[J].Proceedings of the CSEE,2015,35(23):6203-6213(in Chinese).
[7]黄平林,胡虔生,崔杨,等.PWM逆变器供电下电机铁心损耗的解析计算[J].中国电机工程学报,2007,27(12):19-23.Huang Pinglin,Hu Qiansheng,Cui Yang,et al.Analytical calculation of the iron losses of electric machine fed by PWM inverter[J].Proceedings of the CSEE,2007,27(12):19-23(in Chinese).
[8]Leon J I,Lopez O,Franquelo L G,et al.Multilevel multiphase feedforward space-vector modulation technique[J].IEEE Transactions on Industrial Electronics,2010,57(6):2066-2075.
[9]宋文胜,冯晓云.基于零序电压分量注入的单相三电平NPC整流器脉宽调制方法[J].中国电机工程学报,2011,31(36):16-24,238.Song Wensheng,Feng Xiaoyun.A pulse width modulation scheme with zero-sequence voltage injection for single phase three-level NPC rectifiers[J].Proceedings of the CSEE,2011,31(36):16-24,238(in Chinese).
[10]姜艳姝,刘宇,徐殿国,等.PWM变频器输出共模电压及其抑制技术的研究[J].中国电机工程学报,2005,25(9):47-53.Jiang Yanshu,Liu yu,Xu Dianguo,et al.Research on common-mode voltage generated by a PWM inverter and its cancellation technology[J].Proceedings of the CSEE,2005,25(9):47-53(in Chinese).
[11]Leggate D,Pankau J,Schlegel D W,et al.Reflected waves and their associated current[J].IEEE Transactions on Industry Applications,1999,35(6):1383-1392.
[12]Erdman J M,Kerkman R J,Schlegel D W,et al.Effect of PWM inverters on AC motor bearing currents shaft voltages[J].IEEE Transactions on Industry Applications,1996,32(2):250-259.
[13]Rendusara D A,Enjeti P N.An improved inverter output filter configuration reduces common and differential modes DV/DT at the motor terminals in PWM drive systems[J].IEEE Transactions on Power Electronics,1998,13(6):1135-1143.
[14]贾贵玺,周晓畅,李华.高压变频器输出差模滤波器设计和共模电压抑制[J].电工技术学报,2011,26(S1):161-165.Jia Guixi,Zhou Xiaochang,Li Hua.Differential-mode filter design and common-mode voltage suppression at the high voltage VFD output terminals[J].Transactions of China Electrotechnical Society,2011,26(S1):161-165(in Chinese).
[15]尹靖元,金新民,梁建钢,等.独立直流母线双三电平中点嵌位式开绕组零序注入调制策略[J].电网技术,2016,40(8):2456-2463.Yin Jingyuan,Jin Xinmin,Liang Jiangang,et al.Zero sequence voltage injection modulation strategy of dual3L-NPC open-end winding with isolated DC link[J].Power System Technology,2016,40(8):2456-2463(in Chinese).
[16]王颖杰,许家斌,王亮,等.开绕组电机共直流母线双逆变器调制策略优化[J].中国电机工程学报,2016,36(20):5594-5604.Wang Yingjie,Xu Jiabin,Wang Liang,et al.The optimization of modulation strategy of dual inverter with common DC-link for open-end winding motor[J].Proceedings of the CSEE,2016,36(20):5594-5604(in Chinese).