Nearly Constant Switching Space Vector Based Hysteresis Controller for VSI Fed IM Drive

A constant switching frequency hysteresis controller based on current error space vector (CESV) for two-level voltage source inverter fed induction motor (IM) drive is proposed in this paper. Here the stator voltages along the α- and β-axes are estimated using current error information and steady-state model of IM. Estimated stator voltages, switching dwell times, and instantaneous voltage error vectors are used in the online hysteresis boundary computations. The steady-state CESV boundaries and the phase voltage normalized harmonic spectrum of the proposed hysteresis controller at different speeds resembles that of a constant switching frequency voltage-controlled bus clamping pulse-width modulation-based drive. The proposed controller exhibits adjacent voltage vector switching, fast dynamic response under transient conditions, and has a simple controller implementation. The superior performance of the proposed controller is simulated using MATLAB/Simulink platform and experimentally verified on a three-phase 2.2 kW IM drive.