Coordinated Control of SMES Systems for Frequency Regulation in a Two-Area Power System

Superconducting Magnetic Energy Storage Systems (SMES) have the ability to store energy in the form of a magnetic field in the superconducting coil. The present study proposes a phasor model of a SMES system with coordinated control of the same based on a fuzzy logic control (FLC) for the regulation of the grid frequency. The SMES system model controls the active and reactive power that is injected into the grid simultaneously and independently. To evaluate the model, two SMES systems are integrated into Kundur’s two-area test system in order to improve frequency stability during disturbances caused by load increase and load shedding. The frequency and the rate of change of frequency (RoCoF) of the grid are measured by virtual PMUs, and based on these the injection or absorption of active power to the grid is determined, while the reactive power is regulated by the voltage on the docking bar of the SMES system.