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Location methods of oscillation sources in power systems: a survey

Journal of Modern power Systems and Clean Energy 2017年第2期5卷 151-159页

作者： Bin WANG Kai SUN University of Tennessee Knoxville TN 37996 USA

The deployment of a synchrophasor-based widearea measurement system(WAMS) in a power grid largely improves the observability of power system dynamics and the operator’s real-time situational awareness for potential stability issues. The WAMS in many power grids has successfully captured system oscillation events, e.g. poorly damped natural oscillations and forced oscillations, from time to time. To identify the root cause of an observed oscillation event for further mitigation actions, many methods have been proposed to locate the source of oscillation based on different ideas and principles. However, most methods proposed so far for locating the oscillation source in a power grid are not reliable enough for practical applications. This paper presents a comprehensive review of existing location methods, which basically fall into four major categories, plus a few other methods. Their advantages and disadvantages are discussed in detail. Some trends and challenges on the problem of oscillation source location are pointed out along with potential future research directions. Finally, a practical, general scheme for oscillation source location using available location methods is suggested and analyzed.

关键词： power oscillation oscillation source location Traveling wave Damping torque Mode shape Transient energy oscillation test cases library

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维普期刊数据库

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Characteristic Analysis of power oscillations Caused by Disharmony Among Voltage-source-controlled Units in Three-terminal Local power Grid

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Journal of Modern power Systems and Clean Energy 2024年第4期12卷 1295-1308页

作者： Qiyi Yu Yi Tang School of Electrical Engineering Southeast UniversityNanjing 210018China

Previous studies have demonstrated that disharmony among voltage-source-controlled units(VSCUs)may occur on an alternating current(AC)transmission or distribution line under steady-state operating conditions(SSOCs)or quasistatic operating conditions(QSSOCs).As the studies on frequency disharmony have been expanded to multiple disharmonized vS-CUs in the local power grid,its adverse effects on AC lines and equivalent load(EL)at the bus without active voltage control ability(non-active bus)need to be investigated *** the locality of disharmony and common topological con-nections among VSCUs,this paper adopts a Y-type three-termi-nal local power grid(LPG)as the research *** disharmony among the three VSCUs is ***,for the load at non-active bus,the formulas for single-phase instantaneous voltage,load current,load power,as well as average power un-der disharmony operating conditions(DOCs)are *** characteristic indicators of the above electrical quantities are defined,which can measure the amplification and reduction de-grees of the above electrical quantities before and after ***,for the line directly connected to VSCUs,the formulas for single-phase instantaneous line current and power and the average power under DOCs are *** characteristic indicators of power flow are defined,which can be used to quantify the peak amplification impact of oscillation before and after ***,the case study on the Y-type three-terminal LPG under the single-disharmony and the multi-dis-harmony switching scenarios indicates that the long-period pow-er oscillation caused by disharmony may occur in the load flow at the non-active bus and the line *** oscillation causes a serious decrease in load capability and a significant amplification of the peak of line power oscillation.

关键词： New power system power oscillation disharmony voltage-source-controlled unit(VSCU) characteristic analysis

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维普期刊数据库

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Applying Synchronous Condenser for Damping Provision in Converter-dominated power System

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Journal of Modern power Systems and Clean Energy 2021年第3期9卷 639-647页

作者： Ha Thi Nguyen Guangya Yang Arne Hejde Nielsen Peter HΦjgaard Jensen Bikash Pal the Department of Electrical Engineering Danmarks Tekniske UniversitetRoskildeDenmark the Electrical Engineering Technical University of DenmarkLyngbyDenmark Siemens AG Sektor Energie BallerupDenmark the Department of Electrical and Electronic Engineering Imperial College LondonLondonUK

The dynamic characteristics of converter-dominated systems are governed by controlling power converters and the interactions between converter systems and conventional *** oscillations can appear under dynamic operation conditions caused by the phase-locked loop dynamics and interactions among the converter control *** oscillations may be poorly damped,which can result in reduced power generation,longer settling time,or disconnections of sensitive *** is foreseeable that damping services will be critical for power grid stabilization in the future with high penetration of renewable *** this work,synchronous condensers(SCs)are evaluated and applied to provide damping services to the power grid under post-event *** innovative supplementary controller for the automatic voltage regulator of SCs is proposed to improve the frequency stabilization in a converter-dominated system after *** local and remote measurements,SCs are able to modulate the reactive power output and hence,the terminal bus voltage,which further impacts the power flow in the system;therefore,damping can be provided to the frequency *** control is implemented on an industrial-level hardware platform,and the performance is verified by the hardware-in-the-loop simulation.

关键词： power oscillation Prony analysis low-inertia system supplementary controller synchronous condenser(SC)

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