Optimal Dynamic Voltage Restorer Using Water Cycle Optimization Algorithm

This paper proposes a low complexity control scheme for voltage of dynamic restorer (DVR) in three-phase system. The employs the fractional order, proportional-integral-derivative (FOPID) controller to improve on DVR performance order enhance power quality terms response time, steady-state error and total harmonic distortion (THD). result obtained was compared with proportional-integral (FOPI), (PID) (PI) controllers show effectiveness proposed scheme. A water cycle optimization algorithm (WCA) utilized find optimal set all gains. They were used solve four issues; balanced sag, swell, unbalanced swell. It showed that one gain from WCA could issues while others literature needed an individual each problem. To prove concept, simulated MATLAB/Simulink software results revealed can compensate problems. comparative analysis various aspects their %THD discussed analyzed. found PID yields most rapid average time FOPID best term % error. FOPI provide lowest THD percentage %THD. did not differ much FOPI; however, provided outstanding According CBMA curve, responses fall acceptable area. (THD) compensated load within 8% limit accordance IEEE std. 519-2014.