Controlled islanding Strategy for High-impedance Cas‍ca‍ded Corridors Based on Slow Coherency Theory

doi:10.3969/j.issn.1008-0198.2026.02.008

Abstract

Abstract: Large-scale high-impedance cascaded transmission corridors have been built in some regions of China, where traditional out-of-step islanding devices often underperform.This paper proposes ahigh-impedance cascaded corridorsislanding strategy based on slow coherency theory. firstly, based on slow coherency theory, the electrical connections of nodes are classified. Characteristics of high resistance cascade channel splitting are analyzed accordingly, and indicate that this type of channel has the problem of confusion in islanding division after the splitting device is activated due to edge nodes. Secondly, for the chain impedance structure of high impedance cascade channels, a slow coherency and islanding strategy suitable for high impedance cascade channels is proposed by combining natural breaking point method.finally, the IEEE 39 node standard calculation system is used to simulate and verify the proposed strategy with a provincial power grid in western China.Simulation results show that the proposed strategy can effectively search for the optimal solution section, and has good adaptability and effectiveness for power grids with high resistance cascade channels.

Key words: slow coherency theory, high-impedance cascaded corridors, natural breaking point method, islanding strategy

CLC Number:

TM732

WANG Xi, BAi Jiayu, QiU Tianrui, CHEN Baorui, YE Xi, TANG fei. Controlled islanding Strategy for High-impedance Cas‍ca‍ded Corridors Based on Slow Coherency Theory[J]. Hunan Electric Power, 2026, 46(2): 60-69.

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