A heuristic controller for AC circulating current components elimination in modular multilevel converter

Abstract

This paper presents a low complicated algorithm for balancing voltage intending to diminish the power switches switching frequency and control technique to limit the harmonic currents that circulate in Modular Multilevel converter. This algorithm is generally very simple without any extra execution prerequisites and is effectively expandable to any number of submodules (SMs). This balancing control strategy reduces all the capacitors voltage ripple magnitude. The modulation technique utilized is phase-disposition pulse width modulation (PD-PWM) which gives better outcomes contrasted with other balance strategies. It is demonstrated that the proposed control technique gave better execution of decrease of circulating harmonic currents. The total harmonic distortion (THD) of the output Phase and Line voltages are benchmarked against this control strategy. The outcomes are confirmed through MATLAB /Simulink software.