Behavior of a power conditioner for /spl mu/-SMES systems under unbalanced supply voltages and unbalanced loads

In this paper a power conditioning system (PCS) is analyzed under input and output unbalanced conditions. The PCS, which can be utilized as an active filter with additional tasks, consists of a voltage source inverter and a DC current chopper. The PCS considered in this paper uses a superconducting magnet as an energy storage device. A theoretical analysis of the system behavior under unbalanced conditions is presented. Two control strategies are developed and compared with reference to the effects on the source power quality. Numerical simulations have been carried out by PSpice to verify the performance of the PCS in steady-state and transient operating conditions.