Dual-Parameter Adaptive Control Strategy of Inertia and Damping for Energy Storage Converters

Abstract

To tackle the issue of power system transient stability deterioration resulted from a large number of power electronic equipment connected with grid, scholars proposed the virtual synchronous generator control (VSG) strategy. Aiming at problems of transient frequency and active power overshoot in traditional VSG control, a dual-parameter adaptive control strategy of inertia and damping for energy storage converters is proposed in this paper. By analyzing active power and angular frequency transient characteristic curves, mathematical expression of the dual-parameter adaptive control strategy is proposed. It avoids amplification noise caused by the introduction of differential link and the high operation requirement of the controller. The transfer function of power loop is established based on the analysis of traditional small signal model of synchronous generator. Besides, the selection range of parameters is given. Finally, through simulation studies carried out in the Matlab/Simulink environment, it is concluded that compared with traditional VSG control, the presented adaptive control strategy can reduce frequency and power overshoot by approximately 50% during transient process, along with reduce adjustment time effectively.