Power Factor Correction of Three-Phase PWM AC Chopper Fed Induction Motor Drive System Using HBCC Technique

Abstract

In this paper, a new control strategy for an induction motor (IM) drive system fed from three-phase pulse width modulation (PWM) ac chopper is proposed. The main objective of the proposed control scheme is to achieve input power factor correction (PFC) of the IM drive system under different operating conditions. PFC is achieved by continuously forcing the actual three-phase supply currents with the corresponding reference currents, which are generated in phase with the supply voltages, using hysteresis band current control (HBCC) technique. The proposed control strategy has two loops: the inner loop and outer loop. The output of the outer loop is the magnitude of the supply reference current resulting from either speed controller or startup controller, whereas the output of the inner loop is PWM signals of the ac chopper. The proposed ac chopper features a smaller number of active semiconductor switches, four IGBTs, with only two PWM gate signals. As a result, the proposed system is simple, reliable, highly efficient, and cost effective. Mathematical analysis of the drive system is presented. Components of the input LC filter are designed using frequency response. The IM drive system is modeled using MATLAB/SIMULINK, and a laboratory prototype was built and tested. The simulation and experimental results confirm the validity and robustness of the proposed control strategy. INDEX TERMS Hysteresis band current control, induction motor drive, power factor correction, pulse width modulation, three-phase AC chopper.

Design and Simulation of a Three-Phase Induction Motor Speed Control System

“…The a-b-c phase winding voltages 𝑉 𝑎𝑠 , 𝑉 𝑏𝑠 and 𝑉 𝑐𝑠 are first transformed to their equivalent d-q winding voltages, 𝑉 𝑑𝑠 and 𝑉 𝑞𝑠 in order to analyze motor operation. The d-q reference frame model of the three-phase induction motor is provided in equations ( 1)-( 10) (Krause et al, 2013;Metwaly et al, 2019). They are the voltage, flux linkage and torque equations of the three-phase induction motor (Sharma, Parashar and Chandel, 2020).…”

“…Simulation results obtained in MATLAB/Simulink showed different rise time, percentage speed overshoot and very minimal steady state speed error values for three different pulse width modulation techniques. In Metwaly et al (2019), an induction motor fed from three phase PWM ac chopper was presented. The control strategy involves an outer speed control loop and an inner current control loop.…”

Multifunctional Grid-Connected Voltage Source Inverter to Drive Induction Motor Operating With High-Inertia Load

“…The capacitors are switched in and out through mechanical contactors. However, because these contactors are relatively slow, they cannot react to sudden momentary dips in voltage, commonly observed in a weak grid, and can add significant stress to the utility grid [23]. In addition, these capacitance banks are designed to provide a unity power factor only in a few specific loads.…”

Unity Power Factor Operation in Microgrid Applications Using Fuzzy Type 2 Nested Controllers

“…However, in such a system, the existence of the phase shift transformer causes the system to be bulky and expensive. An AC chopper with four switches and applying the hysteresis-band control was reported in [8]. Although the tested configuration in [8] is simple and cost-effective, the flexibility to control the speed or torque of the induction motor might be limited, and there is always a need to transfer between control modes to achieve a power factor improvement.…”