Improved Voltage Controlled Three Phase Voltage Source Inverter Using Model Predictive Control for Standalone System

This article presents a new method for controlling the output voltage of the voltage source inverter (VSI) for stand-alone systems using finite control set model predictive control (FCS-MPC). In the existing conventional method, such as sinusoidal pulse width modulation (SPWM), the output voltage is varied by varying the amplitude modulation ratio (m(a)), which can be problematic if the value of (m(a)) exceeds 1. The conventional SPWM method also suffers from slow transient response. To solve the aforementioned problems, FCS-MPC is proposed for stand-alone VSI. The proposed method precisely controls the output voltage by varying the weighting factor of the cost function in the FCS-MPC algorithm. The proposed technique enhances the transient response, improves the THD and provide stability under all tested conditions. Based on the single step prediction set, it has a low computational load with improved performance. The feasibility of the proposed method is verified by simulations in MATLAB/Simulink.