A dual-layer power optimization strategy for multi-energy storage power station considering system economic efficiency and state of charge balance

doi:10.19799/j.cnki.2095-4239.2024.1004

Abstract

Abstract:

This study addresses cost differences in frequency regulation among energy storage stations and inefficiencies related to state‐of‐charge (SOC) balance within energy storage cell groups. To address these issues, a two‐layer optimization strategy is proposed. The upper layer minimizes frequency regulation costs by considering SOC, state‐of‐health (SOH), internal losses, and aging costs, while the lower layer employs a multi‐objective optimization to minimize charging/discharging losses and SOC deviation within energy storage cell groups. Simulation results show that the proposed strategy reduces frequency regulation costs and losses compared with traditional methods, while maintaining SOC balance and preventing unilateral charging/discharging, thereby enhancing the economic efficiency of frequency regulation and contributing to the extended service life of energy storage units.

Key words: multi-energy storage power station, energy storage cell group, frequency modulation cost, SOC equalization, operating efficiency

CLC Number:

TM 91

Shaojia DANG, Liqiang SUN, Shenyou WANG, Wentao TIAN, Pengfei HU. A dual-layer power optimization strategy for multi-energy storage power station considering system economic efficiency and state of charge balance[J]. Energy Storage Science and Technology, 2025, 14(3): 1247-1257.

Figures/Tables 10

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References 15

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参数	电站1	电站2	电站3
额定功率/MW	3×20	3×20	3×20
额定容量/MWh	3×10	3×10	3×10
单位内损成本/(元/MWh)	105	187	150
投资成本/万元	3000	4000	3500
循环寿命/次	2500	1500	2000

电站	单元1		单元2		单元3
电站	SOC	SOH	SOC	SOH	SOC	SOH
1	0.5	0.9	0.5	0.9	0.55	0.88
2	0.7	0.86	0.6	0.84	0.65	0.86
3	0.6	0.82	0.65	0.84	0.6	0.82

初始抗拒系数	电站1	电站2	电站3
充电	0.2809	0.3708	0.3483
放电	0.4182	0.2727	0.3091

参数	电站1	电站2	电站3
mp/(MW)^-1	0.05	0.05	0.05
np	0.05	0.05	0.05
a	10.69	10.69	10.69
b	-13.3	-13.3	-13.3
c	60.8	60.8	60.8
d	-0.159	-0.159	-0.159

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[2]	Kai DING, Yimin QIAN, Qiao CHEN, Jian ZHENG, Yi WANG. Multitimescale equalization method for lithium-ion battery energy storage systems [J]. Energy Storage Science and Technology, 2022, 11(12): 3872-3882.