Simple cost function and low calculations MPC algorithm for qZSI

Abstract

Recently, Model Predictive Controller (MPC) becomes the most attractive control in power electronics and drives applications. It is incorporated in Z-Source Inverter family (ZSI) where each of capacitor voltage, inductor current and output load currents could be controlled at their setting points' values. In this paper, a proposed algorithm for qSZI is introduced to simplify the system through reducing the number of calculations. The control decides the shoot through case without any need to check all the other possible switching states. The shoot through case roughly is optimized every two sampling periods. Thus, by the proposed strategy has achieved more than 57% improvement in the computational power compared with the oldest algorithm. Also, the cost function for the proposed algorithm consists of one weighting factor for the capacitor voltage without including the inductor current term in the main cost function. These improved features will enhance the performance of MPC with ZSI family. The suggested algorithm is investigated with the simulation results on the basis of Power Simulator (PSIM) software. Then, a prototype of qZSI is constructed on the laboratory and the experimental results using the digital signal processing (DSP) F28335 are given.