运用下垂控制的并网储能系统惯量阻尼特性分析

This approach reveals the inertia and damping characteristics of grid-tied energy storage systems for alleviating the reduction of grid stability caused by distributed energy. Focusing on the dynamic of the DC voltage control time-scale, the dynamic model of the grid-tied energy storage system with improved droop control is established, and the static synchronous generator model is used to analyze the influencing factors of inertial level, damping effect and synchronization ability. It is found that the physical nature of the energy storage system is similar to the droop characteristic of the prime mover. The results show that when the DC/DC converter uses the frequency droop control strategy and the grid-tied inverter uses the voltage and current double closed-loop control strategy, adjusting the PI parameters can equivalently change the inertial and damping characteristics of the system. This study may be helpful to design an effective control of grid-tied energy storage system, which enhances the inertia and damping capacity of power grid and improves the stable operation of distributed power system.