不同空间矢量调制算法的共模电压抑制性能对比研究

Performance Comparison of Common-Mode Voltage Suppression of Different Space Vector Modulation Algorithms

三相逆变器供电的电驱系统中往往会产生幅值较高、高频交变的共模电压,对电驱系统的电磁兼容性、电机轴承寿命等产生危害。为抑制共模电压,分析了SVPWM调制算法下共模电压的生成机理,对AZSPWM1、NSPWM、TSPWM等共模电压抑制算法进行了仿真与分析。结果表明,3种调制算法均能有效地抑制共模电压,TSPWM算法的开关损耗较低、线性调制区域无限制,综合性能较优,但3种调制算法的电机相电流谐波含量均比SVPWM高。试验结果为共模电压抑制方案的选择进一步提供了理论依据和指导。

The drive system powered by three-phase inverter often produces the common-mode voltage with high amplitude and high frequency,which is harmful to the electromagnetic compatibility of the electric drive system and the service life time of the motor bearing.In order to suppress the common-mode voltage,the generation mechanism of the common-mode voltage under the space vector pulse width modulation(SVPWM)algorithm is analyzed,and the common-mode voltage suppression algorithms such as AZPWM1,NSPWM and TSPWM are simulated and analyzed.The results show that the three algorithms can effectively suppress the common-mode voltage,and the TSPWM algorithm has lower switching loss,unlimited linear modulation region and better comprehensive performance.But the motor phase current harmonic content of the three algorithms is higher than that of SVPWM.The results provide theoretical basis and guidance for the selection of common-mode voltage suppression schemes.