A multi-module current-source power conditioning system (PCS) for SMES to improve voltage stability of Microgrid

Due to intermittence and randomness, renewable energy distributed generations (e.g. wind or photovoltaic power) can cause a serious influence on the operation of the Microgrid, such as frequency and voltage fluctuations. Superconducting Magnetic Energy Storage (SMES) is probably a preferred technology to overcome these fluctuations. This paper proposes a multi-module current-source power conditioning system (PCS) for the SMES unit in Microgrid. To achieve high performance of the SMES unit, a generalized power control with an improved PWM method, current balancing algorithm as well as inductor-capacitor (LC) resonance damping method is presented to control the power transfer between the SMES unit and Microgrid. Simulation results show that the proposed SMES unit is very effective to improve the voltage stability of Microgrid.