Comparative Analysis of Hysteresis Current Control Strategies to Achieve Nearly Constant Switching Frequency for a Two- Level Inverter Fed IM Drive

摘要

This paper presents a comparative study on two hysteresis current control strategies for a two-level Voltage Source Inverter (VSI)fed Induction Motor (IM)drive. One of the strategy uses the Current Error Space Phasor (CESP)approach, while the other strategy uses the average value of the inverter pole voltage to generate a variable hysteresis band in which the current error oscillates so that nearly constant switching frequency can be achieved. The controller in both the strategies achieves a phase-to-phase harmonic performance that is very near to the voltage controlled VSI fed IM drive, while getting the advantages of the dynamic performance of current controllers. Both strategies have been successfully simulated in MATLAB (Simulink)and experimentally validated using dSPACE-1103 kit on 1HP IM drive.