Journal of Modern Power Systems and Clean Energy
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ISSN 2196-5625 CN 32-1884/TK
ISSN 2196-5625 CN 32-1884/TK
Kaifeng Wang
School of Electrical Engineering, Xinjiang University, Urumqi, ChinaYing Qiao
State Key Laboratory of Control and Simulation of Power Systems;Generation Equipments of Electrical Engineering, Tsinghua University, Beijing, ChinaLirong Xie
School of Electrical Engineering, Xinjiang University, Urumqi, ChinaJiaming Li
State Key Laboratory of Control and Simulation of Power Systems;Generation Equipments of Electrical Engineering, Tsinghua University, Beijing, ChinaZongxiang Lu
State Key Laboratory of Control and Simulation of Power Systems;Generation Equipments of Electrical Engineering, Tsinghua University, Beijing, ChinaHuan Yang
School of Electrical Engineering, Xinjiang University, Urumqi, China1.School of Electrical Engineering, Xinjiang University, Urumqi, China;2.State Key Laboratory of Control and Simulation of Power Systems;3.Generation Equipments of Electrical Engineering, Tsinghua University, Beijing, China
This work was supported by Open Research Project of State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments, Tsinghua University (No. SKLD20M20), and Xinjiang Uygur Autonomous Region Natural Science Key Project of University Research Program (No. XJEDU2020I004).
Battery energy storage systems (BESSs) can provide instantaneous support for frequency regulation (FR) because of their fast response characteristics. However, purely pursuing a better FR effect calls for continually rapid cycles of BESSs, which shortens their lifetime and deteriorates the operational economy. To coordinate the lifespan savings and the FR effect, this paper presents a control strategy for the FR of BESSs based on fuzzy logic and hierarchical controllers. The fuzzy logic controller improves the effect of FR by adjusting the charging/discharging power of the BESS with a higher response speed and precision based on the area control error (ACE) signal and the change rate of ACE in a non-linear way. Hierarchical controllers effectively reduce the life loss by optimizing the depth of discharge, which ensures that the state of charge (SOC) of BESS is always in the optimal operating range, and the total FR cost is the lowest at this time. The proposed method can achieve the optimal balance between ACE reduction and operational economy of BESS. The effectiveness of the proposed strategy is verified in a two-area power system.
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