Economic Loss Assessment Method of Voltage Sag for Sensitive Industrial Users Considering Sub-Processes Interaction

The existing literature on economic loss assessment of voltage sag do not take into account the interaction among various sub-processes in industrial processes. In order to address the issue that the interruption probability fails to reflect the influence degree of each sub-process on the economic loss caused by voltage sag, and the loss assessment result cannot truly reflect the loss to users, this paper proposes a method for assessing the economic by taking into account the interaction of sub-processes and characterizing the importance of each sub-process. The main steps of proposed method can be divided into: 1) solving the failure probability of sensitive equipment based on K-means clustering, 2) obtain the equivalent fault tree for industrial processes base on the idea of minimum cut sets, 3) characterize the importance degree of each sub-process and the degree of other processes affected by it through the coefficient of structural importance, 4) establish the objective function for economic loss assessment by using the modified process interruption probability. The validity and accuracy of the proposed method verified through a field case.