Experimental investigation of voltage sag mitigation by an advanced static VAr compensator

A laboratory model of an advanced var compensator (ASVC) was constructed to examine its capability for voltage sag mitigation. In this paper, the main structure of the laboratory ASVC is described briefly. Its mitigation effect on voltage sags of different magnitude is then demonstrated. The influences of its initial operation point, system impedance, and DC capacitance are considered. The behaviour of this laboratory ASVC during a phase-angle jump associated with a voltage sag is examined.