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

摘要

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.