基于空间矢量脉宽调制的过调制策略研究

在电机控制中,过调制算法能够显著提高逆变器输出的电压,对提高电机转速有着重要意义。为了改善空间矢量脉宽调制对直流母线电压利用率不足的缺点,研究了基于空间矢量脉宽调制的单模式过调制算法,对输出电压基波幅值与其谐波含量进行理论分析。针对过调制区实际输出电压基波幅值与参考电压不一致这一问题,对目标调制比与给定调制比的关系作出可控性分析,作出拟合曲线并求出函数关系,最后对该过调制算法进行了仿真研究和试验验证。仿真分析和试验验证结果均证明了理论分析的正确性和可行性。

Research on Overmodulation Strategy Based onSpace Vector Pulse Width Modulation

In the motor control, the over modulation algorithm could effectively improve the inverter output voltage, of great significance to improve the motor speed. To improve the shortcomings of space vector pulse width modulation DC bus voltage underutilization, a single mode overmodulation algorithm based on SVPWM was studied, carried out the amplitude of the fundamental voltage and the harmonic content of the output voltage. Aimed at the problem that the amplitude of the fundamental output voltage of the overmodulation zone did not coincide with the reference voltage, the controllability analysis was made on the relationship between the target modulation ratio and the given modulation ratio, made the fitting curve and found the function relation and carried out simulation and experimental verification of the overmodulation algorithm. The simulation results and experimental results showed that the theoretical analysis was correct and feasible.