Energy Storage Allocation and Control Strategy for Fast Frequency Regulation of Regional Grid with High-Penetration Renewable Energy

Abstract

Under the goal of peaking carbon dioxide emissions and achieving carbon neutrality, energy structure has advanced from traditional energy to renewable energy, but the inertia response and primary frequency regulation ability of the power system could be reduced by the high-penetration of renewable energy. The renewable energy unit requires the ability of primary frequency regulation, and energy storage is increasingly widely used in the power system containing renewable energy units. In order to solve the frequency regulation problem caused by high-penetration renewable energy, an Energy storage allocation and Control strategy suitable for fast frequency regulation of regional grid with high-penetration renewable energy is proposed by the paper. Firstly, frequency response characteristics of the power system under different permeability of renewable energy are analyzed. Secondly, an energy storage capacity allocation method based on the mean value method considering confidence is proposed. Thirdly, based on the proposed control strategy of high-penetration of renewable energy power system containing wind/solar/storage, the design of parameters such as frequency regulation dead zone is detailed. Finally, the model of renewable energy participating in primary frequency regulation response is built in Matlab/Simulink, and the performance index of primary frequency regulation is proposed. By analyzing the results, the conclusion is drawn that the renewable energy unit could quickly respond to the frequency fluctuation of the power system and the first “defense line” of the frequency regulation of the power system could be consolidated.