Optimization configuration of distribution network energy storage considering system reliability constraints

doi:10.19799/j.cnki.2095-4239.2024.0541

Abstract

Abstract:

To address the challenge of synchronously and rapidly quantifying the increase in system reliability during the site selection and sizing process of energy storage in distribution networks, this study proposes an optimization configuration model and solution approach that integrates system reliability constraints. First, the proposed model evaluates the impact of energy storage configuration on system reliability using the expected power shortage index as a metric. This study develops a dual-layer planning model for energy storage optimization in distribution networks, considering economic and reliability objectives. The upper layer focuses on minimizing the net investment cost of energy storage, whereas the lower layer aims to minimize load reduction under N-1 fault conditions in the distribution system. Second, based on the KKT condition and composite function differentiation rule in the process of solving optimization problems using the interior point approach, analytical expressions for the sensitivity analysis of the system reliability index to the upper limit of energy storage output and capacity are derived. These expressions were integrated into the linearized system reliability inequality constraints, facilitating parameter transfer between the upper and lower layers of the model. Finally, the effectiveness and rationality of the proposed dual-layer planning model and the derived sensitivity analysis expressions are validated using the improved IEEE RTS-79 test system.

Key words: distribution network, energy storage configuration, system reliability, sensitivity verification

CLC Number:

TM 715

Yuan LI, Shu ZHENG, Yonghua CHEN, Jun WANG, Zihui WANG. Optimization configuration of distribution network energy storage considering system reliability constraints[J]. Energy Storage Science and Technology, 2025, 14(1): 193-202.

Figures/Tables 12

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参数	取值
C_S	240×10³ USD/MWh
C_P	120×10³ USD/MW
L_P	1.5×10³ USD/MWh
d	0.03
T	20年

项目	∂E_EDNS/∂P_E^max	∂E_EDNS/∂S_E
#1储能	-0.03718	0
#2储能	-0.03707	0
#3储能	-0.03532	0

项目	场景1	场景2	场景3	场景4
E_EDNS/p.u.	0.0972	0.094	0.09	0.088
P_E1,max/p.u.		0.1024	0.12	0.12
P_E2,max/p.u.		0	0	0.0482
P_E3,max/p.u.		0.0376	0.114	0.12
S_E1/p.u.		0.1536	0.18	0.18
S_E2/p.u.		0	0	0.0723
S_E3/p.u.		0.0564	0.171	0.18
成本/10⁴USD		213.75	667.02	897.15

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