基于相位校正李雅普诺夫指数的电力系统暂态电压稳定评估

doi:10.19595/j.cnki.1000-6753.tces.210098

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Abstract Wide-area measurement based transient voltage stability assessment is an effective approach to assess the voltage stability in bulk power systems. However, the phase change and measurement error of the voltage time series may result in a false result of transient voltage stability evaluation. To deal with these shortcomings, a phase-corrected maximum Lyapunov exponents (PCMLE) is proposed in this work to assess the transient voltage stability of power systems. Firstly, transient voltage stability evaluation problem was decomposed into MLE analysis problems of the key node voltage deviation curves based on phase space reconstruction and the characteristic curves of the change rate of voltage vs. voltage deviation. Then, a phase-corrected based reconstruct model for the initial time window data while retaining the voltage dynamic process, and the influence of phase change was eliminated. Meanwhile, the shortcoming of setting up MLE sign observation window and initial time window in advance has been overcome. Furthermore, the influence of measurement error was inhibited based on moving average method. With the aid of the proposed PCMLE model, the transient voltage stability assessment with oscillation instability and delay instability can be achieved. Finally, the proposed method is evaluated by a modified IEEE 39 bus system and China Southern Power Grid, and the results verify the accuracy and effectiveness of the proposed approach.

Key words： Transient voltage stability maximum Lyapunov exponent wide area measurement system phase correction

Received: 09 November 2020

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TM712

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	Articles by authors
	Wang Changjiang
	Jiang Tao
	Chen Houhe
	Li Guoqing
	Liu Fusuo

Cite this article:

Wang Changjiang,Jiang Tao,Chen Houhe等. Transient Voltage Stability Assessment of Power Systems Based on Phase Correction Maximum Lyapunov Exponent[J]. Transactions of China Electrotechnical Society, 2021, 36(15): 3221-3236.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.210098 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I15/3221

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