摘要
三相四开关逆变器采用"五段式"空间矢量脉宽调制(SVPWM)方案可有效减小电机的转矩脉动,而四开关逆变器的母线电容电压不平衡将直接影响SVPWM的效果,导致电机三相电流不平衡,使电机的转矩脉动加剧。在深入分析四开关逆变器SVPWM原理的前提下,分析了直流母线电压不平衡对电机运行的影响,提出了一种有效的补偿办法。仿真结果表明,补偿后的异步电机VVVF系统具有较好的性能。
The four-switch three-phase inverter only have four basic voltage space vector, The method of five-segment mode can reduce the torque ripple effectively, but the DC-link capacitor voltage unbalance of four-switch inverter will affect the effect the SVPWM directly and cause the three-phase current unbalance of the motor and intensify the torque ripple of the motor. Based on the analysis of the principle of four-switch SVPWM analysis the affect of the DC-link voltage unbalance on the motor, propose a effective compensation method. The simulations results showed that with the compensation the Induction motor VVVF system had a better performance.
出处
《电机与控制应用》
北大核心
2010年第10期25-31,共7页
Electric machines & control application
基金
广东省自然科学基金资助项目(31384)
关键词
四开关逆变器
空间矢量脉宽调制
电容电压不平衡
four-switch inverter
space vector pulse width modulation
capacitor voltage unbalance