PILOT PROTECTION OF ACTIVE DISTRIBUTION NETWORK CONSIDERING PHOTOVOLTAIC OUTPUT CHARACTERISTICS

Wu Chuhong; Mu Longhua; Fang Chongkai

doi:10.19912/j.0254-0096.tynxb.2024-1917

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (3) : 616-624. DOI: 10.19912/j.0254-0096.tynxb.2024-1917

PILOT PROTECTION OF ACTIVE DISTRIBUTION NETWORK CONSIDERING PHOTOVOLTAIC OUTPUT CHARACTERISTICS

Wu Chuhong, Mu Longhua, Fang Chongkai

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Abstract

This article investigates active distribution networks with distributed photovoltaic （PV） integration. Analyzing the specific control strategies of distributed PV units, the study characterizes the fault current magnitude and phase characteristics under varying PV output conditions. On this basis, it analyzes the operating range of the phase difference of the positive-sequence fault component of the current at both ends of the faulted line and concludes that the traditional current phase comparison type pilot protection may fail when the photovoltaic output is small. Therefore, this paper improves the criterion by combining the amplitude ratio and phase angle difference of the positive-sequence fault-component current and proposes an active distribution network pilot protection scheme based on comprehensive phase angle difference. This solution only needs to collect current information and does not need to install voltage transformers, making it highly economical. The simulation results show that this solution is not affected by variations in PV output or fault types.

Key words

power system protection / distribution networks / distributed power generation / photovoltaics / pilot protection / positive sequence current / fault component

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Wu Chuhong, Mu Longhua, Fang Chongkai. PILOT PROTECTION OF ACTIVE DISTRIBUTION NETWORK CONSIDERING PHOTOVOLTAIC OUTPUT CHARACTERISTICS[J]. Acta Energiae Solaris Sinica. 2026, 47(3): 616-624 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1917

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