Research on Grid-Forming Energy Storage Configuration for Distributed Photovoltaic Consumption and Reliability Improvement of Distribution Network

XU Deyu; HUANG Yuan; TANG Zhiyuan; LIU Junyong; SUN Zengjie; HAO Zhifang

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Research on Grid-Forming Energy Storage Configuration for Distributed Photovoltaic Consumption and Reliability Improvement of Distribution Network

XU Deyu¹, HUANG Yuan¹, TANG Zhiyuan¹, LIU Junyong¹, SUN Zengjie², HAO Zhifang³

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Abstract

【Objective】 The high proportion of distributed photovoltaic (PV) grid integration leads to insufficient capacity for power absorption in distribution networks.Meanwhile, the development of new distribution systems imposes higher reliability requirements. Grid-forming energy storage, with its flexible power synchronization control capabilities, plays a crucial role in both enhancing the consumption of distributed PV in new distribution networks and improving system reliability. Therefore, this paper proposes an optimal configuration model for grid-forming energy storage that simultaneously addresses distributed PV consumption and reliability improvement in distribution networks. 【Methods】 First, a bi-level optimization model for the siting and sizing of grid-forming energy storage is established. The upper-level model considers fault conditions and load importance to establish an energy storage siting model designed to improve distribution network reliability. The lower-level model, considering the uncertainty of distributed PV systems, establishes an energy storage sizing model to enhance PV consumption. Specifically, the probability distribution confidence set of PV uncertainty is subject to 1-norm and ∞-norm constraints, and is solved using the Column and Constraint Generation (CCG) algorithm based on the distributionally robust optimization. Second, a comprehensive evaluation index system incorporating reliability, distributed PV consumption, and economic performance is established. The optimal configuration scheme is obtained using an improved Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) method. 【Results】 The proposed algorithm is validated through a modified 33-node test system. The results show that compared with the traditional energy storage scheme, the reliability index of the proposed model is improved by more than 10%, and the light rejection rate of distributed photovoltaic is reduced by 7.44%. The optimal effect can be obtained by configuring grid-forming energy storage at four key nodes. 【Conclusions】 The proposed grid-forming energy storage optimization configuration method significantly improves the distributed photovoltaic capacity and reliability of distribution network, and provides a reference for the planning and investment of high proportion of distributed photovoltaic access to distribution network.

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Distribution network / Grid-forming energy storage / Reliability / Distributed photovoltaic / Distributionally robust optimization

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XU Deyu, HUANG Yuan, TANG Zhiyuan, LIU Junyong, SUN Zengjie, HAO Zhifang. Research on Grid-Forming Energy Storage Configuration for Distributed Photovoltaic Consumption and Reliability Improvement of Distribution Network[J]. Electric Power Construction. 0

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