Analysis of Cost Function Composition based on the Horizon Time Prediction of an Indirect MPC Current Control in Single-Phase Grid-Connected PV Inverters

In this paper, one technical gap of an indirect model predictive control (MPC) is discussed and a possible solution is proposed. A basic case study involving a traditional three-level h-bridge and a first order L filter was considered in order to magnify the effect of time horizon prediction and voltage over the regulated grid current waveform. An analysis related to the cost function composition over a horizon time prediction is then presented for different settings of the operational point. This paper presents only a part of obtained simulation results by means a model built a PSIM/Powersim. Even so, results show that one step forward could be classified as the most suitable form. And the number of involved applications could be even more since the fact that discussed results also indicate an unnecessity of higher processing time over several horizon time predictions for achieving the best results. Such conclusions would allow a smoother digital implementation of indirect MPC control method and result on a more efficient MPC controller in terms of energy effort in industrial applications.