An Accurate Online Dynamic Security Assessment Scheme Based on Random Forest

With the increasing integration of renewable energy resources and other forms of dispersed generation, more and more variances and uncertainties are brought to modern power systems. The dynamic security assessment (DSA) of modern power systems is facing challenges in ensuring its accuracy for unpred...

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Bibliographic Details
Published in:Energies (Basel) Vol. 11; no. 7; p. 1914
Main Authors: Liu, Chengxi, Tang, Fei, Leth Bak, Claus
Format: Journal Article
Language:English
Published: Basel MDPI AG 01.07.2018
Subjects:
Accuracy
Alternative energy sources
dynamic security assessment
Energy resources
outlier identification
random forest
Renewable resources
wide-area measurement
ISSN:1996-1073, 1996-1073
Online Access:Get full text
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Summary:With the increasing integration of renewable energy resources and other forms of dispersed generation, more and more variances and uncertainties are brought to modern power systems. The dynamic security assessment (DSA) of modern power systems is facing challenges in ensuring its accuracy for unpredictable operating conditions (OC). This paper proposes a novel approach that uses random forest (RF) for online DSA. Hourly scenarios are generated for the database according to the forecast errors of renewable energy resources, which are calculated from historical data. Fed with online measurement data, it is able to not only predict the security states of current OC with high accuracy, but also indicate the confidence level of the security states one minute ahead of the real time by an outlier identification method. The results of RF together with outlier identification show high accuracy in the presence of variances and uncertainties due to wind power generation. The performance of this approach is verified on the operational model of western Danish power system with around 200 transmission lines and 400 buses.
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ISSN:1996-1073
1996-1073
DOI:10.3390/en11071914