Performance Evaluation of Multi-Step Exhaustive Search Finite Control Set Model Predictive Control for Multi-Level Voltage Source Converter

Modern, advanced digital control approaches for (multi-level) Voltage Source Converters (VSC) such as the Model Predictive Control (MPC) have been strongly investigated in the recent years. In this paper, we analyse a finite control set MPC approach, which has been implemented with an exhaustive search algorithm. Regarding the prediction model, a hybrid modelling approach is investigated, i. e. the complete plant model combines both, the discrete switching characteristics of the VSC as well as the DC-link, output filter and grid dynamics. To account for measurement and computational delays, a predictive compensation strategy is proposed. The overall control is implemented on an FPGA, taking advantage of its parallel processing capability. The major design philosophy of the VHDL implementation to face the high computational burden of the algorithm is discussed. Simulations and experimental studies have been carried out to benchmark various design parameters and validate the simulation.