ROBUST CURRENT CONTROL METHOD OF VOLTAGE SOURCE PWM INVERTER

ABSTRACT In recent years, the voltage source PWM (Pulse Width Modulated) inverter is used for power supply in the field of motor control. Current tracking control of inverter is very important because current control ability affects control performance of plants. In this paper, the robust current control method of voltage source PWM inverter is presented; current is controlled to be exactly equal to the reference current under variations of load parameters and operating conditions. The influence of parameter variations is restrained by feedback gain based on Lyapunov's direct method. The feedback gain is calculated on-line to ensure system's stability with various disturbances.