Dead-time Compensation for 2-Level Voltage Source Inverters Based on Harmonic Current Controllers

Abstract

This paper proposes a dead-time compensation method for 2-level voltage source inverters based on harmonic current controllers. The sixth harmonic of the stator current in the synchronous reference frame originated from the dead-time effect is attenuated by using current resonant controllers. The resonant controllers are connected in parallel with the conventional PI current regulator. The resonant controllers calculate a compensation voltage that is equal to the error voltage due to the dead-time, therefore the dead-time effect is mitigated. The proposed method is verified by simulation results.