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A Correlation Analysis Method for Power Systems Based on Random Matrix Theory

The operating status of power systems is influenced by growing varieties of factors, resulting from the developing sizes and complexity of power systems. In this situation, the model-based methods need to be revisited. A data-driven method, as the novel alternative on the other hand, is proposed in...

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Published in:IEEE transactions on smart grid 2017-07, Vol.8 (4), p.1811-1820
Main Authors: Xinyi Xu, Xing He, Qian Ai, Qiu, Robert Caiming
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Language:English
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description The operating status of power systems is influenced by growing varieties of factors, resulting from the developing sizes and complexity of power systems. In this situation, the model-based methods need to be revisited. A data-driven method, as the novel alternative on the other hand, is proposed in this paper. It reveals the correlations between the factors and the system status through statistical properties of data. An augmented matrix as the data source is the key trick for this method and is formulated by two parts: (1) status data as the basic part; and (2) factor data as the augmented part. The random matrix theory is applied as the mathematical framework. The linear eigenvalue statistics, such as the mean spectral radius, are defined to study data correlations through large random matrices. Compared with model-based methods, the proposed method is inspired by a pure statistical approach without a prior knowledge of operation and interaction mechanism models for power systems and factors. In general, this method is direct in analysis, robust against bad data, universal to various factors, and applicable for real-time analysis. A case study based on the standard IEEE 118-bus system validates the proposed method.
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subjects augmented matrix
Big data
big data analytics
Buses (vehicles)
Complexity
Correlation
Correlation analysis
Covariance matrices
Eigenvalues and eigenfunctions
Line spectra
linear eigenvalue statistics
Mathematical analysis
Mathematical models
Matrices (mathematics)
Matrix methods
Matrix theory
Power system stability
power systems
random matrix theory
Real time
Robustness (mathematics)
title A Correlation Analysis Method for Power Systems Based on Random Matrix Theory
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