RESEARCH ON PILOT PROTECTION OF TWO TERMINAL WEAK FEED AC SYSTEM CONSIDERING NEGATIVE SEQUENCE CURRENT INJECTION STRATEGY

Yang Wentao; Hou Junjie; Fan Yanfang; Song Guobing; Wu Xiaofang; Li Yan

doi:10.19912/j.0254-0096.tynxb.2024-2145

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (4) : 46-60. DOI: 10.19912/j.0254-0096.tynxb.2024-2145

RESEARCH ON PILOT PROTECTION OF TWO TERMINAL WEAK FEED AC SYSTEM CONSIDERING NEGATIVE SEQUENCE CURRENT INJECTION STRATEGY

Yang Wentao¹, Hou Junjie¹, Fan Yanfang¹, Song Guobing^1,2, Wu Xiaofang³, Li Yan⁴

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Abstract

Aiming at the problem that traditional negative-sequence pilot directional protection may fail to operate or maloperate due to the influence of converter control strategies, this paper proposes a pilot protection scheme for double-ended weak AC systems based on negative-sequence impedance difference characteristics under negative-sequence current injection by Modular Multilevel Converters （MMC）. Firstly, the impact of negative-sequence current suppression strategies on both sides of the system under asymmetrical faults on traditional negative-sequence pilot directional protection is investigated. Secondly, considering multiple factors, a negative-sequence current injection strategy that suppresses active power fluctuations is introduced. On this basis, the differences in negative-sequence impedance characteristics under internal and external faults are analyzed. Finally, a detrended fluctuation analysis method is introduced to calculate the fluctuation functions at both ends and transmit logic quantities, thereby constructing a pilot protection scheme for double-ended weak AC systems. Simulation results show that the proposed pilot protection scheme can operate reliably under a transition resistance of 300 Ω and with 20 dB noise interference.

Key words

double-ended weak AC systems / negative sequence inhibition / negative sequence injection / negative sequence impedance / detrended fluctuation analysis（DFA） / pilot protection

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Yang Wentao, Hou Junjie, Fan Yanfang, Song Guobing, Wu Xiaofang, Li Yan. RESEARCH ON PILOT PROTECTION OF TWO TERMINAL WEAK FEED AC SYSTEM CONSIDERING NEGATIVE SEQUENCE CURRENT INJECTION STRATEGY[J]. Acta Energiae Solaris Sinica. 2026, 47(4): 46-60 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2145

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