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Unformatted text preview: 232 1 Wide Area Measurement System in Action T. Babnik, Member, IEEE , U. Gabrijel, B. Mahkovec, M. Perko, and G. Sitar Abstract This paper presents functionality of developed wide area monitoring system (WAMS) and its implementation in Slovenian transmission system. The system enables real-time exchange of selected phasors between transmission system operators. Additionally, recordings captured on November 4 th 2006, when the UCTE interconnected grid split into three areas are presented and discussed. At the end some indications of possible future development of wide area protection and control system are given. Index Terms WAMS, PMU, wide-area system, wide area monitoring, phasor data concentrator, multi-user Web SCADA, virtual PMU. I. INTRODUCTION C ASCADE tripping and blackouts cause huge disturbances in the power supply. Partial or complete blackouts can be caused by wide area disturbances such as angle instability, cascade tripping, etc. Experiences from the latest blackouts in the USA  and Europe [1-4] reveal the need for wide area information acquisition for better power system operation. Additional, energy markets within the power industry deregulation pushed operation of electric power systems towards the limits and increased the complexity of power system operation. Monitoring of dynamic of the power system can prevent or mitigate consequences of wide-area disturbances. Phasor measurement units (PMU) enable current and voltage measurements for dynamic monitoring of the power system [5-6]. By a real-time collection of phasor measurements from the power system into a central unit it is possible to set up wide area monitoring, control and protection platform for a real-time procedures. Conventional SCADA (Supervisory Control and Data Acquisition) systems provide steady, non-synchronous information of the power system with time resolution between 1 and 10 s. Therefore the control and dispatch center cannot know the dynamic performance of the power system exactly. Wide area monitoring system (WAMS) acquires data every 20 ms; each data is equipped with time. Moreover, data is synchronized with accuracy up to ms. T. Babnik is with Elpros d.o.o., Teslova ulica 30, SI-1000 Ljubljana, Slovenia (phone: +386 1 477 66 95; fax: +386 1 477 67 35; e-mail: email@example.com). U. Gabrijel is with ELES d.o.o., Hajdrihova 2, SI-1000 Ljubljana, Slovenia, (e-mail: firstname.lastname@example.org). B. Mahkovec is with Elpros d.o.o., Teslova ulica 30, SI-1000 Ljubljana, Slovenia (e-mail: email@example.com). M. Perko is with Elpros d.o.o., Teslova ulica 30, SI-1000 Ljubljana, Slovenia (e-mail: firstname.lastname@example.org). G. Sitar is with ELES d.o.o., Hajdrihova 2, SI-100 Ljubljana, Slovenia, (e- mail: email@example.com)....
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