WU Junyong,ZHANG Ruoyu,JI Jiashen,et al.Two-stage Transient Stability Prediction Method of Power System Considering Cost of Misdetection and False Alarm[J].Automation of Electric Power Systems,2020,44(24):44-52.
WU Junyong,ZHANG Ruoyu,JI Jiashen,et al.Two-stage Transient Stability Prediction Method of Power System Considering Cost of Misdetection and False Alarm[J].Automation of Electric Power Systems,2020,44(24):44-52. DOI: 10.7500/AEPS20200521003.
Two-stage Transient Stability Prediction Method of Power System Considering Cost of Misdetection and False Alarm
There exist misdetection (misclassification of unstable samples into stable samples) and false alarm (misclassification of stable samples into unstable samples) by the transient stability prediction method based on artificial intelligence
which is a major obstacle to practical engineering applications. In response to this deficiency
this paper proposes a two-stage power system transient stability prediction method based on the convolutional neural network (CNN) considering the cost of misdetection and false alarm. At the first stage
the corresponding sliding time window input features are trained to obtain different layers of integrated CNN models
and the credibility index for each output layer is established. Then
the credibility threshold optimization selection problem is transformed into a multi-objective optimization problem. This stage could minimize or even eliminate the misdetection and output credible samples with high credibility as soon as possible. At the second stage
an emergency control start-up strategy based on multi-criteria fusion for the credible unstable samples predicted at the hierarchical prediction stage is proposed to reduce the actual loss caused by false alarm. The analysis of a simulation system shows that the proposed method can minimize or even eliminate the misdetection at the minimum cost
and promote the probability of practical engineering application of transient stability prediction results based on artificial intelligence method.
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