Charging and discharging strategies for clustered regional energy storage system
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Brandenburg University of Technology Cottbus-Senftenberg, Cottbus, Germany
Wrocław University of Science and Technology, Wrocław, Poland
Yang Li   

Brandenburg University of Technology Cottbus-Senftenberg, Cottbus, Germany
Power Electronics and Drives 2022;7 (42)
With the massive expansion of decentralized renewable energy in electricity grid networks the power supply system has been changed from central to de-central, from directional to bi-directional. However, due to the regional energy structure difference in the power imbalance between electricity generation and consumption is becoming more and more serious. A grid-scale energy storage system (ESS) can be one solution to balance the local difference. In this paper two charging/discharging strategies for the grid-scale energy storage system were proposed to decide when and with how much power to charge/discharge the ESS. Research was based on real power system data sets. In order to realize the two strategies this paper focuses on the application of fuzzy logic control system. The proposed strategies aim to reduce the peak power generation, consumption and the grid fluc-tuation. In particular, this paper analyses the ratio between energy-capacity to rated power of ESS. This paper presents simula-tion procedures and provides several examples by different energy-to-power (e2p) ratios. The control system is based on the in-puts of the state-of-charge and the power imbalance. The performance of the proposed strategies is evaluated from two as-pects, the normalized power of ESS itself and the influence on the power grid.