Research on improved current droop control scheme of energy storage converter

Abstract

The droop control scheme is adopted in the energy storage converter to improve the voltage and frequency support capability of the energy storage converter to the regional power grid. The droop control strategy of active current frequency and reactive current voltage is specifically adopted. Aiming at the problem that the traditional current droop control can not suppress the grid side fluctuation, which leads to the poor transient characteristics of the output voltage of the energy storage converter, a method to characterize the droop coefficient according to the change rate of the effective value of the output voltage of the energy storage converter is proposed, and the droop coefficient is adaptively adjusted according to the voltage regulation to provide virtual inertial support for the system. Simulation is used to verify the proposed scheme. The results show that the new current droop control strategy can effectively improve the transient voltage performance of the energy storage converter.