Model Predictive Current Control with Duty Cycle Optimization for Two-Level Three-Phase Grid-Tied Inverter with Output LCL Filter Based on Forward Euler Approximation

This paper proposes a model predictive current control (MPCC) by using a duty cycle for a three-phase inverter connected to the grid Optimization based on Forward Euler approximation. To achieve much better steady state performance, in the prior model predictive current control (MPCC), the discretetime system model is used to checks each of the 7 possible switching states to choose a state that minimizes the cost function. However, single voltage vector employed in one control period is extremely limited to decrease the current ripples to a minimum value. Hence, to obtain sufficient performance, the sampling frequency is necessary to choose high. In order to resolve this issue, a duty ratio optimization technique has been performed. According to the simulation results, the proposed MPCC obtain much better steady-state.