Charging and Discharging Strategies for Clustered Regional Energy Storage System
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1
Brandenburg University of Technology Cottbus-Senftenberg, Department of Energy Distribution and High Voltage Engineering, Cottbus, Germany
2
Wrocław University of Science and Technology, Department of Electrical Engineering Fundamentals, Wrocław, Poland
Corresponding author
Yang Li
Brandenburg University of Technology Cottbus-Senftenberg, Cottbus, Germany
Power Electronics and Drives 2022;7 (42):56-67
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ABSTRACT
With the massive expansion of decentralised renewable energy in electricity grid networks, the power supply system has been changed
from centralised to decentralised one and from directional to bi-directional one. 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 ESS were proposed to decide when and with how much power to charge/discharge the ESS. In order to realise 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 fluctuation. In particular, this paper analysis the ratio between energy-capacity and rated power of ESS. The
performance of the proposed strategies is evaluated from two aspects, the normalised power of ESS itself and the influence on the
power grid. Simulation studies were carried out on the rule-based control systems with different energy-to-power (e2p) ratios, and
the results show that the proposed charging strategy with combination of extreme situation of power imbalance and the rest capacity
of ESS provides a smooth load curve for the regional power grid system while the external power exchange is reduced effectively.