Abstract
With the continuous development of the active distribution network (ADN), the problem of security and stability has become increasingly prominent. From the perspective of improving the defense capability of ADN, a new a multi-angle dynamic risk assessment index system based on the comprehensive vulnerability rate model is proposed in this paper. Risk threshold is used to monitor the status of the distribution network, which determine whether ADN needs to enter the active defense period. The minimum amount of load shedding outside the fault isolation region is regarded as the objective function, considering other constraints such as limited resources, the coordinated active defense strategy (CADS) is formed in this paper. Finally, the accuracy of the comprehensive vulnerability rate and the risk assessment value are verified by example analysis, and the superiority of the CADS is verified by comparing different defense strategies.
Highlights
As one of the most extreme weather, the ice disaster will pose a great threat to the safe and stable operation of the distribution network [1,2]
Making full use of the transfer capacity of the tie-lines and the flexible controllability of distributed energy such distributed generations (DGs) and energy storage system (ESS), an evolutionary process of coordinated active defense strategy (CADS) based on fault prediction which involves load transfer with Distributed generations (DGs) connected in active distribution network (ADN), island operation, and load shedding is established in this paper
The analytic hierarchy process-entropy weight method (AHP-EWM) [28] is proposed based on the advantages of these two methods, which makes up for the shortcomings of the single method and improves the accuracy of the risk evaluation index weights
Summary
As one of the most extreme weather, the ice disaster will pose a great threat to the safe and stable operation of the distribution network [1,2]. The evaluation method based on dynamic risk theory can evaluate the operation status of the distribution network in real time and analyze the vulnerable links, so it has superiority compared with reliability analysis. An ice hazard dynamic risk assessment index system concluding the ice-covered dynamic intrusion index, ice disaster-resistance capability index and demand response potential index is proposed in this paper so that it can monitor the current operating status of the distribution network in real time. Making full use of the transfer capacity of the tie-lines and the flexible controllability of distributed energy such distributed generations (DGs) and energy storage system (ESS), an evolutionary process of coordinated active defense strategy (CADS) based on fault prediction which involves load transfer with DGs connected in active distribution network (ADN), island operation, and load shedding is established in this paper.
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