An Improved Deadbeat Direct Power Control for Grid Connected Inverter System

In this paper, a deadbeat control is proposed with reduced steady-state error in grid connected inverter system. The proposed method takes into consideration the losses occurring in the inverter during each switching cycle. Initially, a method to track the reference current is proposed and the same is extended for direct power control. The proposed method does not require phase-locked-loop, transformation into rotating reference frame and output voltage sensor thereby improving the transient response. The proposed method is verified for a single-phase grid connected switched capacitor based multilevel inverter. The simulation results of proposed current control are presented for step change in current reference. The proposed deadbeat direct power control is verified for PV connected system with varying irradiance.