Distributed Photovoltaic Power Islanding Protection Method Based on Zero Sequence Voltage Phase Change

Wenwen SUN; Jun ZHANG; Xiangcheng ZHANG; Guihong ZHANG; Yubo WANG

doi:10.16513/j.2096-2185.DE.2207309

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Distributed Energy ›› 2022, Vol. 7 ›› Issue (3) : 72-77. DOI: 10.16513/j.2096-2185.DE.2207309

Application Technology

Distributed Photovoltaic Power Islanding Protection Method Based on Zero Sequence Voltage Phase Change

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Distributed photovoltaic generation is mainly connected to the low-voltage distribution network of 35 kV and below. Low-voltage distribution network faults are mainly single-phase ground faults, accounting for more than 70%. Since single-phase ground fault does not affect the normal transmission of system power, when a fault occurs in the grid, the conventional distributed photovoltaic generation islanding protection method has the problem of islanding discrimination failure and unreliability, which brings serious challenges to the safe and stable operation of the grid. Firstly, the paper derives the expression of zero sequence voltage when a single-phase ground fault occurs in the grid, and qualitatively analyzes the key factors affecting the magnitude and phase of the zero sequence voltage. Secondly, the zero sequence voltage magnitude and phase change law when single-phase grounding fault occurs in two ways, i. e., the neutral point is not connected to the power grid and the grounding through the arc extinguishing coil, are compared and analyzed, and based on this, a distributed power islanding identification method based on the phase change of zero sequence voltage is proposed. Finally, some suggestions are given for the application of the islanding protection method in practical engineering.

Key words

distributed photovoltaic generation / single-phase grounding / islanding protection / zero sequence voltage / phase change

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Wenwen SUN , Jun ZHANG , Xiangcheng ZHANG , et al . Distributed Photovoltaic Power Islanding Protection Method Based on Zero Sequence Voltage Phase Change[J]. Distributed Energy Resources. 2022, 7(3): 72-77 https://doi.org/10.16513/j.2096-2185.DE.2207309

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Funding

Project supported by Special Research Project of State Grid Qinghai Electric Power Company (Simulation and Analysis of the Electromagnetic Transient Stability of Qinghai New Energy Delivered Through DC)