Energy Storage Configuration Considering the System Wind Power Reserve Capacity Under High Wind Power Permeability

Abstract

The high proportion penetration of the wind power weakens the inertia and frequency regulation capacity of the power system. The energy storage system (ESS) is widely used in the inertia support and frequency regulation of the power grid with the characteristics of rapid response and stable output. Firstly, the rated speed and active power output of the doubly fed induction generator (DFIG) were taken as constraint conditions, and the optimal power reservation coefficient was set based on the rotor overspeed control to divide the wind speed range of the DFIG participating in the system frequency modulation. On this basis, considering the frequency support capacity of the system, a coordinated frequency modulation method of the DFIG and the ESS was proposed. Based on the analysis of the ESS active power output and system steady-state recovery process, the dynamic frequency regulation characteristics of the ESS under the control strategy of the virtual synchronous machine were described, so as to realize the optimal configuration of the control parameters of the ESS under different working conditions and different support requirements. Simulation results show that the proposed method can make full use of the frequency modulation capacity of the DFIG while ensuring the frequency modulation requirements of the system, optimize the configuration results of the ESS parameters, realize the smooth output of the ESS, and improve the frequency support ability of the system.

Keywords

• wind power generation
• energy storage system
• doubly fed induction generator
• rotor overspeed control
• virtual synchronous generator
• power reserve coefficient