A Hierarchical Optimal Operation Strategy of Hybrid Energy Storage System in Distribution Networks with High Photovoltaic Penetration

Jian Chen, Jiaqi Li, Yicheng Zhang, Guannan Bao, Xiaohui Ge and Peng Li
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Jian Chen: Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education, Shandong University, Jinan 250061, China
Jiaqi Li: Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education, Shandong University, Jinan 250061, China
Yicheng Zhang: School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
Guannan Bao: State Grid Shandong Electric Power Dispatching & Control Center, Jinan 250001, China
Xiaohui Ge: Electric Power Research Institute of State Grid Zhejiang Electric Power Co., LTD., Hangzhou 310014, China
Peng Li: Electric Power Research Institute of State Grid Zhejiang Electric Power Co., LTD., Hangzhou 310014, China

Energies, 2018, vol. 11, issue 2, 1-20

Abstract: In this paper, a hierarchical optimal operation strategy for a hybrid energy storage system (HESS) is proposed, which is suitable to be utilized in distribution networks (DNs) with high photovoltaic (PV) penetration to achieve PV power smoothing, voltage regulation and price arbitrage. Firstly, a fuzzy-logic based variable step-size control strategy for an ultracapacitor (UC) with the improvement of the lifetime of UC and tracking performance is adopted to smooth PV power fluctuations. The impact of PV forecasting errors is eliminated by adjusting the UC power in real time. Secondly, a coordinated control strategy, which includes centralized and local controls, is proposed for lithium-ion batteries. The centralized control is structured to determine the optimal battery unit for voltage regulation or price arbitrage according to lithium-ion battery performance indices. A modified lithium-ion battery aging model with better accuracy is proposed and the coupling relationship between the lifetime and the effective capacity is also considered. Additionally, the local control of the selected lithium-ion battery unit determines the charging/discharging power. A case study is used to validate the operation strategy and the results show that the lifetime equilibrium among different lithium-ion battery units can be achieved using the proposed strategy.

Keywords: hybrid energy storage system (HESS); hierarchical operation strategy; photovoltaic (PV); fuzzy-logic; lifetime equilibrium (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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