Configuration of an Energy Storage System Considering the Frequency Response and the Dynamic Frequency Dispersion

Abstract

The high proportion of renewable energy sources (RESs) in the system reduces the frequency support capacity and aggravates the generation of unbalanced power, while the dynamic frequency dispersion makes it difficult for a centralized energy storage system (ESS) to take into account the frequency requirements of different regions. In this context, the research takes the region with high penetration of RESs and frequent power fluctuations as the grid node of the ESS. By configuring the parameters of the ESS under the control strategy of virtual synchronous generators, the inertia and the primary frequency reserve of the system are supplemented, and the regulation characteristics of the ESS are depicted. Taking the steady-state recovery time and the amplitude coefficient as the evaluation indexes, the effects of the virtual inertia constant, the virtual damping coefficient, and the virtual frequency regulation coefficient on the behavior of the ESS are deeply analyzed. Finally, the quantitative configuration of the ESS is realized by considering the frequency response and the dynamic frequency dispersion.

Optimization Strategy of Hybrid Configuration for Volatility Energy Storage System in ADN

“…Due to the access of WG and load, there is frequency fluctuation in the distribution network system. This study adds 120 MW of WG in the operation layer to adjust the energy storage system output, using the energy storage output to suppress the fluctuation [21,22]; 5% of the WG output is used for system frequency regulation. When the fluctuation frequency range exceeds 0.2 Hz, the whole capacity of WG is added to the distribution network; otherwise, the energy storage capacity calculated under the optimal strategy is used.…”