Simulation and analysis of series voltage restorers (SVR) for voltage sag relief

This paper describes a family of series voltage restorer (SVR) techniques and their relative effectiveness in reducing the number of trips experienced by voltage-sensitive loads. A total of three different SVR compensation techniques an proposed and their respective voltage sag mitigation abilities are verified via simulation. The influence of the initial operating point, system load power factor, phase-angle jumps associated with voltage sags and DC capacitance on the transient and steady-state performance of each SVR is also examined. Consideration of potential interaction between the SVR, connected loads, power system and system faults are necessary since the SVRs serve very sensitive loads with stringent requirements