On the stator current waveform optimizing based on SVPWM and fuzzy logic

In order to eliminate the motor harmonic torques, waveform optimizing control strategy of the stator current is always adopted in a drive system. This paper presents an improved hysteresis current control method, which analyzes a traditional hysteresis current controller and combines a voltage space vector modulate method. This method combines comparison results of hysteresis current and the arm period of voltage space vector. Then the fuzzy logical rules of current hysteresis coefficient are determined by the membership function of each variable. The experimental result indicates that the improved method not only got rid of the disadvantages of uncontrolled switching frequency and irregular output PWM voltage, but also obviously enhanced the performance of whole drive system.