Projection Pursuit: A General Methodology of Wide-Area Coherency Detection in Bulk Power Grid

This paper presents a general approach for coherency detection in bulk power systems using the projection pursuit (PP) theory. Supported by the concept of center of inertia (COI) in power systems, the PP theory is employed to model the wide-area coherency detection as an optimization problem. In the...

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Bibliographic Details
Published in:IEEE transactions on power systems 2016-07, Vol.31 (4), p.2776-2786
Main Authors: Jiang, Tao, Jia, Hongjie, Yuan, Haoyu, Zhou, Ning, Li, Fangxing
Format: Article
Language:English
Subjects:
Algorithms
Assessments
Center of inertia (COI)
Coherence
coherency detection
Electric utilities
Electricity distribution
Generators
Methodology
Optimization
Oscillators
Polypropylenes
Power system stability
Principal component analysis
Projection
projection pursuit (PP)
Rotors
synchronous phasor measurement units (PMUs)
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Summary:This paper presents a general approach for coherency detection in bulk power systems using the projection pursuit (PP) theory. Supported by the concept of center of inertia (COI) in power systems, the PP theory is employed to model the wide-area coherency detection as an optimization problem. In the proposed method, the optimal projection direction in high dimensional orthogonal space is explored in order to detect the coherent groups via the data from synchronous phasor measurement units (PMUs). Two quantitative indices constructed with projection assessment index (PI), the objective of the optimization model, are then defined in order to determine the critical coherent group and the dominant coherent groups. The coherency detection criterion and the implementation framework for the proposed approach are also presented. Simulation data from the 16-machine 68-bus test system and China Southern power Grid (CSG), along with actual field-measurement data retrieved from WAMS database in the CSG, are employed to demonstrate the effectiveness and applicability of the proposed algorithm under different disturbances. It is shown that the proposed methodology successfully detects the dominant coherent groups of generators and buses in bulk power system via the wide-area field-measurement data.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2015.2475401