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Ningxia Longji Ningguang Instrument Co., Ltd., Yinchuan 750021, China
Received：10 December 2025，
Revised：2025-12-17，
Published：25 February 2026
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ZHOU Lingfang. A Coordinated Control Method for Grid-forming and Power Quality in Renewable Energy Direct Supply Systems Based on Energy Storage UPQC[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(1): 101-107.
ZHOU Lingfang. A Coordinated Control Method for Grid-forming and Power Quality in Renewable Energy Direct Supply Systems Based on Energy Storage UPQC[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(1): 101-107. DOI： 10.14044/j.1674-1757.pcrpc.2026.01.013.
新能源直接为用电负荷供电能够节省电力设备建设成本，并提高电能利用效率。但是，当新能源脱离大电网独立运行时，由于缺乏大电网的支撑，存在系统频率、电压波动性强等问题，影响供电可靠性。针对这一问题，本文研究了一种结合储能装置的UPQC拓扑及其控制方法。首先，分析系统拓扑及电能质量问题；其次，阐述所提出的融合控制方法，并联部分实现构网控制与光伏的最大功率跟踪，串联部分负责进行电能质量治理；该控制方法能够根据新能源发电情况自主调节，同时实现对电压波动等电能质量问题的治理。最后，通过仿真对所提控制策略的有效性进行了验证。
Direct power supply from renewable energy sources to electrical loads can not only reduce the construction costs of power equipment，but also improve power utilization efficiency.However，in case of disconnection from the main grid and independent operation，such problems as strong fluctuation of system frequency and voltage due to the lack of the support of the main grid are existed，and power supply reliability is thereby affected. To address this issue，tin his paper a unified power quality conditioner （UPQC） topology integrated with an energy storage device and its corresponding control method are studied. First，the issues of system topology and power quality are analyzed.Then，the proposed integrated control method is described. The paralllel part achieves grid-forming control and the maximum power tracking of photovoltaic systems，and the series part is responsible for power quality management. The control method can make self adjustment in accordance with power generation of renewable energy and，at the same time，achieve the management of such power quality isses as voltage fluctuation. Finally，the effectiveness of the proposed control strategy is verified by simulation.
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