微电网多层级协同反时限保护方案

doi:10.19595/j.cnki.1000-6753.tces.191724

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Abstract Due to the integration of large-scale distributed generation and the flexible operation modes, microgrids require for a much higher demand on the reliability and stability. Thus, the traditional distribution network protection is difficult to meet the requirements of microgrid operation. According to the topology and fault characteristics of microgrids, this paper proposes a multi-layer collaborative inverse-time protection scheme. The protection scheme is divided into the core layer, the regional layer and the system layer. It puts forward an inverse-time differential current (ITDC) protection based on the positive sequence current phasor. Then the principle, criterion and matching method of the ITDC protection are studied. Based on the ITDC protection, the scheme designs a multi-layer cooperative protection algorithm. Besides, in order to reduce the influence of the non-periodic components on the calculation of phasor, an improved algorithm for phasor calculation is proposed. The protection scheme achieves the coordination of the core layer primary protection, regional layer backup protection and system layer interconnection protection. It has an adaptive capability for the grid-connected mode and islanding mode. The simulation model is established in PSCAD/EMTDC, and the effectiveness and reliability of the protection scheme is verified by results.

Key words： Multi-layer collaborative protection inverse-time differential current protection interconnection protection improved phasor calculation algorithm microgrids

Received: 12 December 2019

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TM773

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	Huang Wentao
	Tai Nengling
	Liu Jianqing
	Ma Zhoujun
	Wang Jie

Cite this article:

Huang Wentao,Tai Nengling,Liu Jianqing等. Multi-Layer Collaborative Inverse-Time Protection Schemes for Microgrids[J]. Transactions of China Electrotechnical Society, 2021, 36(3): 623-633.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.191724 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I3/623

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