The Power Angle and Phase Measurement Units Based Wide Area Measurement system and its application

The Power Angle and Phase Measurement Units Based Wide Area Measurement system and its application

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1-4244-1519-5/07/$25.00 ©2007 IEEE. 2007 iREP Symposium- Bulk Power System Dynamics and Control - VII, Revitalizing Operational Reliability August 19-24, 2007, Charleston, South Carolina, USA The Power Angle and Phase Measurement Units Based Wide Area Measurement System and Its Application Yu-Qing JIN, Chuan QIN, Feng WU, Jing-Dong HAN, Qun XU, Deng-Jun YAN, Ping JU HoHai University, China Abstract A new method for the measurement of the rotor angles and the phasors of power systems is proposed in this paper. Based on this method, the Angle and Phase Measurement Unit (APMU) has been developed. The rotor angles can be measured directly with speed signals of generators instead of being calculated with the power equations of the generator. Hence, the measurement precision of the rotor angle is improved. Based on the APMU and the Global Position System (GPS), a Wide Area Measurement System (WAMS) has been constructed in the HeNan Power Grid (HNPG), China. The control center for the WAMS was also developed. The server in the control center collects the real-time data from all the APMUs, analyzes the operation state of the power network, records the dynamic responses of the power system under disturbances, and displays the information with the Graphical User Interface (GUI). The measurements were also applied in the detection of low frequency oscillation, on-line state estimation and parameter estimation of synchronous generators. Introduction Measurements of the voltage and the current are the foundation of the monitoring and analysis of power systems. The voltage and current are phasors represented by both magnitude and phase. Unfortunately, in the present Supervisory Control and Data Acquisition/Energy Management System (SCADA/EMS) system, only the magnitudes are measured, and the phases are estimated using the state estimation algorithm. The accuracy of the estimated phase may not meet the needs. In order to improve the accuracy, the phase should also be measured. In the past decades, the measurement of the phase is very difficult for the lack of synchronized reference frame of time. Recently, the development of Global Position System (GPS) supplies an opportunity to synchronize the reference frame of time at different locations. Based on the GPS, the synchronized Phasor Measurement Unit (PMU) was firstly proposed at Virginia Tech [1, 2], which measures both the magnitude and phase of the voltage and the current of the power systems. The hardware of the PMU proposed was the same as that of a digital fault recorder, except that the phase-locked oscillator was synchronized by the GPS. Since the phase- locked oscillators of the PMUs at different locations are synchronized by the GPS, the reference frames of time in PMUs are synchronous. The phase deference between the voltages at different nodes in power systems can be measured.
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This note was uploaded on 01/29/2011 for the course ENGR 52 taught by Professor Mcmillan during the Spring '10 term at Baylor Med.

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The Power Angle and Phase Measurement Units Based Wide Area Measurement system and its application

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