Nonlinear sliding-mode control of a bidirectional three-phase converter for plug-in electric vehicles

Abstract

In this paper, we propose a sliding-mode control (SMC) strategy for bidirectional operation of a three-phase pulse width modulation (PWM) converter suitable for plug-in electric vehicles (PEVs). The proposed controller operates the three-phase converter at unity power factor with no steady-state errors. The controller takes advantage of inherent characteristics of sliding-mode controllers such as fast dynamics, low harmonics, and being independent of the load and system parameters. The proposed control strategy keeps the input voltage and current in phase in charging mode, when the converter acts as a rectifier and boost converter. Similarly, controller maintains the input voltage and current of the three-phase system out of phase in discharging mode, when the converter is operated as an inverter. Numerical studies are conducted to evaluate the performance of the proposed controller.