Improvement of Voltage Quality in a Distribution System by a Novel Simplified Unit Vector Theory

Abstract

Nowadays, electrical engineers are increasingly concerned about power quality due to the rising load demand and the utilization of non-linear loads by end users. Power must be supplied continuously and with excellent quality. Voltage variation is a prevalent occurrence in power distribution systems due to the presence of reactance in AC systems and fluctuations in load demand. The dynamic voltage restorer is a compensation device that effectively resolves voltage problems within power distribution systems. The theory of synchronous reference frame is utilized for controlling the DVR components, requiring intricate computations due to the implementation of abc-dq transformation, phase-lock loops, and PI control. The following document introduces an innovative simplified unit vector theory designed to streamline the control of DVR, ultimately minimizing control complexity. The novel streamlined approach underwent testing in scenarios involving distribution systems experiencing sag, swell, or a combination of both. Simulation models were created and outcomes were achieved through the utilization of MATLAB/SIMULINK software.