Customer-oriented distribution network operational risk assessment considering urgency

A customer-oriented method for assessing the operational risk of distribution network and its urgency is proposed,which takes customers as the assessment objects and analyzes the loss of customer by simulating the load transfer in operating distribution network with anticipated fault. Different risk indexes considering load uncertainty are defined,such as customer expected outage probability,customer expected outage duration and customer expected electricity loss,which are combined with the risk index of system expected outage customer number to indicate the influence of anticipated fault on whole system. A risk index of overload is defined to reflect the influence of overload. Based on the comparison between the preventive control execution time and the risk coming time,the urgency level of risk indicates the opportunity to effectively execute the preventive control. The proposed method is illustrated with IEEE 3-feeder distribution network as an example,verifying it feasible and effective.