Microgrid stabilization by SMES with SOC control

In the isolated microgrid with wind and photovoltaic power, the intermittent power produced from such power sources is an inevitable problem. In addition, under the occurrence of short circuits, the transient power swing may deteriorate the system stability. To deal with these problems, this paper focuses on the new power controller design of superconducting magnetic energy storage (SMES) considering the state-of-charge (SOC) control for microgrid stabilization. The structure of active and reactive power controllers of SMES is a proportional-integral (PI) controller. The optimization of PI parameters based on the minimization of the SOC deviation and the power output deviation of wind and PV sources is carried out. Simulation study confirms that the SMES with SOC control not only guarantees the stabilizing performance under normal and faulted conditions, but also prevents the over-charge and deep-discharge operations.