Stability technique for boost converter in AC motor driving system

Abstract

Usually, a boost converter is used to link source voltage and inverter in ac motor driving system. In this paper, a boost converter control system is designed to offer stable dc link voltage and assure the inverter could provide regulated sinusoidal power to ac motor under flexible input voltages (rectifier utility power or battery packs). The mathematic model of the boost converter based on PWM three-terminal switch device is discussed. A new control technique based on duty cycle feed-forward and variable parameter PI control is proposed to assure the boost converter could endure source voltage disturbance or loads. The test results proved the proposed control technique has robust performance. Keywords-boost converter;duty cycle feed-forward;variable parameter PII.