Grid-Connected Power Fluctuation Suppression and Energy Storage Optimization Configuration of Photovoltaic-Energy Storage System

ZHAO Bin; LIANG Gao; JIANG Menghao; ZOU Gang; WANG Li

doi:10.12096/j.2096-4528.pgt.23084

发电技术 (Jun 2024)

Grid-Connected Power Fluctuation Suppression and Energy Storage Optimization Configuration of Photovoltaic-Energy Storage System

ZHAO Bin,
LIANG Gao,
JIANG Menghao,
ZOU Gang,
WANG Li

Affiliations

ZHAO Bin: College of Electrical and Information Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan Province, China
LIANG Gao: College of Electrical and Information Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan Province, China
JIANG Menghao: Shenzhen Bornsales Science &Technology Co., Ltd., Shenzhen 518057, Guangdong Province, China
ZOU Gang: College of Electrical and Information Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan Province, China
WANG Li: College of Electrical and Information Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan Province, China

DOI: https://doi.org/10.12096/j.2096-4528.pgt.23084
Journal volume & issue: Vol. 45, no. 3
pp. 423 – 433

Abstract

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ObjectivesBattery energy storage system is one of the effective means to ensure the reliability of photovoltaic (PV) power generation system and improve the utilization rate of PV power generation. However, there are some problems in the PV-energy storage power station, such as the difficulty of power fluctuation suppression and the unreasonable configuration of energy storage capacity. In order to solve these problems, relevant research was carried out.MethodsFor energy-based battery energy storage, the characteristics of scheduling mode and autonomous mode were analyzed, and a power-limited suppression strategy of PV-energy storage system based on energy storage operation in scheduling mode was proposed to realize power suppression and reduce the frequency of energy storage charge/discharge switching. The optimization objective of minimizing abandoned power losses in the PV-energy storage system was established, with constraints such as the probability of power fluctuation exceeding the limit. An algorithm was used to solve and optimize the energy storage configuration. Taking the 50 MW Sangzhuzi PV-energy storage power station in Langming, Tibet as an example, the effectiveness of the proposed grid-connected power suppression strategy was validated.ResultsThe proposed grid-connected power suppression strategy can reduce the probability of power fluctuation exceeding the limit from 25.64% to 6.41% without increasing the frequency of energy storage charge/discharge switching. When the probability of grid-connected power fluctuation exceeding the limit is 5%, the optimal configuration for the energy storage system of the power station is determined to be 14.5 MW/94 MW⋅h.ConclusionsThe proposed power fluctuation suppression strategy and energy storage optimization configuration method can provide technical reference for the optimal design and operation of grid-connected PV-energy storage system.

Published in 发电技术

ISSN: 2096-4528 (Print)
Publisher: Editorial Department of Power Generation Technology
Country of publisher: China
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Applications of electric power; Technology: Electrical engineering. Electronics. Nuclear engineering: Production of electric energy or power. Powerplants. Central stations; Science
Website: https://www.pgtjournal.com/EN/2096-4528/home.shtml

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