多电平滞环控制异步电动机调速系统

Multilevel Optimal Switching Frequency Voltage Hysteresis Control Used for the Speed Regulating System of an Induction Motor

基于多电平变流器 ,如中点嵌位逆变器和串联逆变器特别适合在中高压大功率场合应用特征 .针对多电平变流器 ,传统的 PWM控制方法的适用性存在的问题 ,提出了一种非常适合多电平变流器的 PWM控制方法——多电平 SFO滞环控制方法 .这种方法算法简单 ,容易实现 ,开关频率低 ,电压调制系数高 .

Multilevel converters, such as neutral point clamped inverters and cascade inverters, are particularly suitable to being applied in high power occasions. To these multilevel converters, the applicability of many conventional PWM techniques is facing a challenge, so new PWM techniques for the multilevel converters are put forward. The authors propose a multilevel optimal switching frequency voltage hysteresis control scheme. The control scheme is easily realized, and the algorithm for it is simple. It has a low switching frequency and a high voltage modulation coefficient. The scheme is applied to the speed regulating system of a sensorless induction motor, and it is shown that the control scheme is feasible.