Predictive Direct Power Control for Grid-Connected Power Converters with an Extended State Observer Based DC-Link Voltage Regulator

This paper proposes an Extended State Observer (ESO) based predictive direct power control strategy for three-phase two-level grid connected power converters. The proposed control is in cascade structure which consists of two control loops, instantaneous power tracking loop (inner loop) and voltage regulation loop (outer loop). A proportional integral (PI) controller integrated with an ESO is designed for the outer loop. In the inner loop, the finite-control-set model predictive control (FCS-MPC) strategy is employed to directly force the active and reactive powers of the system to track their desired values. Simulation results are provided to demonstrate the effectiveness and feasibility of the proposed control strategy.