Voltage and Frequency Support Scheme for Storage Systems in Distribution Grids

Power electronics converters can enable grid support functionalities under abnormal grid conditions. In this paper, a voltage-frequency support strategy based on the reactance to resistance (X/R) ratio of the grid impedance is proposed for a flywheel energy storage system. Unlike conventional support schemes where voltage and frequency support is decoupled, the proposed strategy considers the coupling between voltage and frequency due to the...