Probing Signal Design for Power System Identification

This paper investigates the design of effective input signals for low-level probing of power systems. In 2005, 2006, and 2008 the Western Electricity Coordinating Council (WECC) conducted four large-scale system-wide tests of the western interconnected power system where probing signals were injecte...

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Bibliographic Details
Published in:IEEE transactions on power systems 2010-05, Vol.25 (2), p.835-843
Main Authors: Pierre, John W, Ning Zhou, Tuffner, Francis K, Hauer, John F, Trudnowski, Daniel J, Mittelstadt, William A
Format: Article
Language:English
Subjects:
Conferences
Control systems
Councils
DESIGN
Design engineering
Design methodology
Direct current
Electric power generation
ELECTRICITY
Frequency
Frequency domains
Gain
Identification
INTERCONNECTED POWER SYSTEMS
Large-scale systems
Power system control
power system identification
Power system interconnection
power system measurements
power system monitoring
power system parameter estimation
power system reliability
power system testing
POWER SYSTEMS
POWER TRANSMISSION AND DISTRIBUTION
PROCESSING
RESOLUTION
Signal design
Studies
System testing
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Summary:This paper investigates the design of effective input signals for low-level probing of power systems. In 2005, 2006, and 2008 the Western Electricity Coordinating Council (WECC) conducted four large-scale system-wide tests of the western interconnected power system where probing signals were injected by modulating the control signal at the Celilo end of the Pacific DC intertie. A major objective of these tests is the accurate estimation of the inter-area electromechanical modes. A key aspect of any such test is the design of an effective probing signal that leads to measured outputs rich in information about the modes. This paper specifically studies low-level probing signal design for power-system identification. The paper describes the design methodology and the advantages of this new probing signal which was successfully applied during these tests. This probing input is a multi-sine signal with its frequency content focused in the range of the inter-area modes. The period of the signal is over 2 min providing high-frequency resolution. Up to 15 cycles of the signal are injected resulting in a processing gain of 15. The resulting system response is studied in the time and frequency domains. Because of the new probing signal characteristics, these results show significant improvement in the output SNR compared to previous tests.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2009.2033801