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Oscillatory Stability Analysis of a Power System over a Large Set of Operating Conditions

机译：大型运行条件下电力系统的振荡稳定性分析

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Power system oscillations represent an increasing concern worldwide, especially as far as inter-area phenomena are concerned. Modal analysis is the classical technique allowing to obtain information on oscillatory modes, sensitivity and participation factors, according to small-signal stability theory. PSS parameter design also relies on the modal analysis results. The issue with inter-area oscillations is that PSSs are typically tuned to damp local modes, thus neglecting wide-area interactions of the generators.rnThe paper presents the oscillatory stability analysis of the Peruvian power system carried out by LINEAR, a package for modal analysis and PSS optimisation.rnLINEAR implements two different algorithms to provide either a comprehensive analysis of all oscillatory modes, or an efficient search focused on critical damping modes, respectively. As modal analysis is a computational intensive task, the substantial time saving introduced by the efficient procedure is quite interesting. The optimisation algorithm, based on sequential quadratic programming techniques, aims to design PSS parameters in order to guarantee an adequate damping for all critical modes and for all analysed operating conditions, while minimising the number and the gain of the PSSs.rnThe identification of disturbances related to small-signal stability in the operation of the Peruvian interconnected system suggested to carry out an in-depth investigation on the small-signal behaviour of that system. The paper presents results of the analysis of a set of foreseen operating conditions provided by COES (Peruvian system operator). After the determination of the critical modes and relative sensitivities to PSS gains, results of the mentioned optimisation procedure to obtain a suitable global tuning of the generators' PSSs are presented. The procedure identifies the PSS settings that allow to shift damping of all critical modes above a specified threshold, for all of the given scenarios. Both the modal analysis output and the settings proposed by the optimisation procedure have been confirmed by time-domain simulation.
机译：电力系统的振荡在世界范围内引起越来越多的关注，尤其是对于区域间现象而言。模态分析是一种经典技术，可以根据小信号稳定性理论获得有关振荡模式，灵敏度和参与因子的信息。 PSS参数设计还依赖于模态分析结果。区域间振荡的问题在于，PSS通常被调至潮湿的局部模式，从而忽略了发电机的广域相互作用。rn本文介绍了由线性分析模态分析软件包LINEAR对秘鲁电力系统进行的振荡稳定性分析。 rnLINEAR实施两种不同的算法，以提供对所有振荡模式的全面分析，或分别针对临界阻尼模式进行有效搜索。由于模态分析是一项计算量大的任务，因此高效程序带来的大量时间节省非常有趣。该优化算法基于顺序二次规划技术，旨在设计PSS参数，以确保对所有关键模式和所有分析的运行条件都具有足够的阻尼，同时最大程度地减小PSS的数量和增益。为了确保秘鲁互连系统运行中的小信号稳定，建议对该系统的小信号行为进行深入研究。本文介绍了由COES（秘鲁系统运营商）提供的一组可预见的运行条件的分析结果。在确定了临界模式和对PSS增益的相对灵敏度之后，提出了上述优化程序的结果，以获得发电机PSS的适当全局调整。该过程确定了PSS设置，对于所有给定情况，该设置均允许将所有关键模式的阻尼转移到指定阈值以上。模态分析输出和优化程序建议的设置都已通过时域仿真得到确认。

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