STATIC VOLTAGE STABILITY LIMIT WARNING METHOD FOR POWER SYSTEM ACCOUNTING FOR SOURCE-LOAD UNCERTAINTY

Ren Hui; Wang Xi; Tian Lei; Zhao Mingjun; Chang Xiqiang; Zhen Zhao

doi:10.19912/j.0254-0096.tynxb.2023-0974

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (10) : 249-258. DOI: 10.19912/j.0254-0096.tynxb.2023-0974

STATIC VOLTAGE STABILITY LIMIT WARNING METHOD FOR POWER SYSTEM ACCOUNTING FOR SOURCE-LOAD UNCERTAINTY

Ren Hui¹, Wang Xi¹, Tian Lei¹, Zhao Mingjun², Chang Xiqiang², Zhen Zhao¹

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Abstract

Aiming at the uncertainty on both source and load sides, the study performs the early warning of power system static voltage instability. The study first demonstrates mathematical derivation and theoretical analysis that the trend of variance coefficients of system variables changes significantly during the critical transition occurring in fast and slow systems with bifurcation and noise dual induced. Considering the noise-induced instability, the trend is more difficult to be observed and the trend detection based on fixed threshold will fail. Secondly, the critical transition characteristics and perturbation of the node voltage of the new energy power system are analyzed,and the early warning method based on the critical transition voltage collapse is proposed. For the problem of difficult trend prediction caused by noise,based on the measurement data, Bayesian change point detection is utilized to monitor the variance of the node voltage in real time,and the probability obtained from Bayesian change point detection is used to warn of the node voltage collapse at the beginning of the significant change of the trend,and the validity of the method is verified through simulation calculation.

Key words

uncertainty analysis / renewable energy / voltage measurement / critical transition / electric power system stability / alarm system

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Ren Hui, Wang Xi, Tian Lei, Zhao Mingjun, Chang Xiqiang, Zhen Zhao. STATIC VOLTAGE STABILITY LIMIT WARNING METHOD FOR POWER SYSTEM ACCOUNTING FOR SOURCE-LOAD UNCERTAINTY[J]. Acta Energiae Solaris Sinica. 2024, 45(10): 249-258 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0974

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