ADAPTIVE DISTANCE PROTECTION PRINCIPLE OF DISTRIBUTION LINE SUITABLE FOR IIDG-T CONNECTION

Dai Zhihui; Ning Zhiheng; Liu Meiyuan; Liu Junyi

doi:10.19912/j.0254-0096.tynxb.2025-0504

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (8) : 359-368. DOI: 10.19912/j.0254-0096.tynxb.2025-0504

ADAPTIVE DISTANCE PROTECTION PRINCIPLE OF DISTRIBUTION LINE SUITABLE FOR IIDG-T CONNECTION

Dai Zhihui, Ning Zhiheng, Liu Meiyuan, Liu Junyi

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Abstract

The inverter-type distributed generation （IIDG） represented by photovoltaics is connected to the grid by T-connection, which leads to the risk of incorrect operation of the original distance protection device in the distribution network. Based on this, an adaptive distance protection principle for distribution lines suitable for IIDG-T connection is proposed. Firstly, combined with the output characteristics of IIDG fault, the causes of misoperation and rejection of traditional distance protection in IIDG-T connected distribution network are analyzed. Secondly, based on the fault equivalent network, the evolution law of the fault electrical quantity of the distribution line with IIDG-T connection is explored. Finally, a complete adaptive distance protection scheme is constructed for three-phase short-circuit and two-phase short-circuit fault scenarios. The simulation results show that the proposed scheme can adaptively adjust the setting value only by relying on the local measurement information, which can reduce the communication cost of the distribution network. At the same time, the proposed scheme is not disturbed by the IIDG-T connection capacity, output fluctuation, fault location and type, and has good applicability in the IIDG-T connected active distribution network scenario.

Key words

distributed power supply / distribution networks / relay protection / T-connected branch / distance protection / adaptive setting

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Dai Zhihui, Ning Zhiheng, Liu Meiyuan, Liu Junyi. ADAPTIVE DISTANCE PROTECTION PRINCIPLE OF DISTRIBUTION LINE SUITABLE FOR IIDG-T CONNECTION[J]. Acta Energiae Solaris Sinica. 2026, 47(8): 359-368 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0504

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