Voltage Balancing Using Continuously Variable Series Reactor

Abstract

Continuously Variable Series Reactor (CVSR) is a device able to control its ac reactance by using the nonlinear B-H characteristic of the ferromagnetic core, shared by ac and dc windings. The dc bias magnetic flux generated by the dc winding can regulate the equivalent ac impedance to balance the three-phase voltages and diminish adverse effects of the imbalance on the distribution system operation and equipment. In this work, the Gyrator-Capacitor (G-C) approach is implemented to model the interaction between the magnetic and electric circuits. Results from simulation of voltage balancing by a CVSR via control of its bias dc circuits are presented. Multiple cases with different levels of imbalance of the load current have been studied. It is shown that the CVSR with proper control can maintain the load voltage within the acceptable range as the load randomly varies.