Compensation of voltage‐based power quality problems using sliding mode observer with optimised PI controller gains

This study discusses a control algorithm for dynamic voltage restorer (DVR) based on sliding mode observer (SMO) with an optimisation‐based proportional integrator (PI) tuning to compensate the voltage related power quality problems. In this work, a three‐phase VSC‐based topology of DVR is selected with a self‐supported capacitor. This DVR configuration using the proposed control algorithm has been used for mitigation of unbalance, sag, and swells in the supply voltage. The estimation of grid parameters in undesirable situations based on the exosystemic model are the advantages proposed control. New nature‐inspired optimisation algorithm named as Harris hawks optimiser (HHO) has been applied to obtain the PI gains in the control algorithm to eliminate the time required for the tuning process. The main advantage of HHO is the avoidance of local minima and exploration and exploitation features of the algorithm. DVR system with a combination of SMO‐based control algorithm along with HHO optimised PI controllers have been developed in MATLAB/Simulink and tested for above said voltage‐based disturbances mitigation in the supply voltage.