Voltage source converter control under unbalanced grid voltage conditions

Abstract

This paper proposes a novel control method for voltage source converter (VSC) connected to grid under unbalanced voltage conditions. The method is based on utilizing the full control capabilities of the switching converter. The proposed method makes the voltage source inverter (VSI) supply the voltages according to the requirements of the load and/or grid. The method is tested with both the balanced and unbalanced cases of the grid. The grid's average voltage serves as the reference for the average voltage at the converter's output alongside the active and reactive power's set-point requirements. The mathematical formulation of the proposed method is given in detail and simulations are done in MATLAB/Simulink® to validate the effectiveness of the proposed method.