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Keywords

modular energy storage, feeder end, voltage regulation, distribution station area, charging/discharging power

Abstract

To address the seasonal overvoltage and undervoltage issues in China ’s rural photovoltaic （PV） distribution station areas，this study proposes a relocation and charging/discharging power optimization method for modular energy storage adapted to the mitigation of voltage limit violations in the rural PV distribution station areas.Voltage limit violations are mitigated by relocating modular energy storage units to PV distribution station areas and regulating the active charging/discharging power of the energy storage units and the reactive power of the inverters.Specifically，the source-load characteristics of China's rural PV distribution station areas are analyzed.The feeder voltage equation is applied to reveal that the voltage limit violations in the rural distribution station areas are caused by the seasonal mismatch between sources and loads.Next，a mathematical model of modular energy storage is developed by leveraging its detachable and flexible deployment capabilities.Then，an optimization model for the relocation and charging/discharging power control of modular energy storage considering the relocation and leasing costs of modular energy storage is constructed on the premise of reducing node voltage deviations in the distribution network，network losses，and PV curtailment penalty.The model optimizes the candidate nodes for energy storage relocation，the number of relocated units，and their active and reactive power output.Finally，the feasibility and effectiveness of the proposed method are verified on the power distribution system in Hengdong County，Hunan Province.The results show that modular energy storage can effectively improve the voltage quality and economic benefits of China's rural PV distribution station areas.

DOI

10.19781/j.issn.1673-9140.2026.04.021

First Page

256

Last Page

266

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