Minimization of current ripple and overshoot in four switch three-phase inverter fed BLDC motor using tracking anti-windup PI controller

Abstract

This paper presents a cost effective solution of four switch three phase inverter (FSTPI) driven BLDC motor drive. Recently, the BLDC motor becomes most popular in industrial and residential applications due to its low cost, easy control techniques, low maintenance and constant torque. High switching losses are associated with the conventional BLDC motor because of six number of switches hence poor efficiency. FSTPI fed BLDC motor drive has high efficiency due to the low switching losses. The BLDC motor is found non-liner system due the saturation element. Integral part of PI or PID controller is used to reduce steady state error but integral part may saturate if large changes are made in set point which results in unwanted side effect known as windup phenomenon. Windup phenomenon causes large overshoot and settling time in torque-speed characteristic. A tracking anti windup (AWC) PI controller and hysterics current controller has been introduced for effective utilization of proposed system and to make system free from windup phenomenon. FSTPI fed BLDC motor drive system with tracking anti windup PI controller and hysterics current controller is modeled in MATLAB/Simulink software. Dynamic behavior of proposed system has been determined and simulation results are proved the system effectiveness and validity. Comparative study of conventional BLDC motor and proposed system are carried out.