Study of Voltage Sag Detection and Dual-Loop Control of Dynamic Voltage Restorer

Abstract

Voltages sags have become the major issue that prevents the customers from getting high-quality power supply, and the dynamic voltage restorer (DVR) is considered an effective way to solve this issue. In this work, a method for voltage sag detection implemented in the time-domain is firstly addressed, which features highly accurate and fast response. Then, the dual-loop voltage–current control for the DVR is intensively investigated. Specifically, the optimal tuning of the inner current loop to achieve the maximum active damping is approached, and the voltage controller implemented in the discrete-time is developed. Tuning of the voltage loop based on critical damping is also approached, which features reduced settling time and avoidance of overshoot. The simulation and experimental results have verified the effectiveness of the proposed method for detection and management of voltage sags.

Research on Voltage Sag Detection Algorithm based on Regional Transmission System

“…It is commonly expressed as a unit value in calculations. The duration of voltage sag is the time difference between the occurrence and end of the sag [4][5][6]. In actual engineering measurements, the duration of the sag process varies depending on the magnitude of the voltage sag.…”

A Combination of Appropriate Placement and size of Multiple FACTS Controllers to reduce Voltage Sag and Swell

“…The following are some of the extended merits of the UPQC [26][27][28]. It is also the most complete tool for improving power quality for nonlinear loads that need a precise sinusoidal input supply [29][30][31][32].…”