A Decision-Making Method for the Loop Closing Operation in 10kV Distribution Network

Loop closing current may affect the security of power system during loop closing operation. In this study, practical criterion of secure loop closing operation is derived by analysing the relationship between current protection and loop closing current. On the basis of the practical criterion, a decision-making method for loop closing operation in 10kV distribution network considering the probability distribution of electric load is proposed. Based on probabilistic load flow theory, the cumulative distribution characteristic of loop closing current can be obtained by cumulant method. Finally, make a decision on loop closing operation according to the over-limit probability of loop closing current. In addition, a method for calculating cumulants of input variables based on historical load data is proposed, which overcomes the shortcomings of traditional numerical methods. The simulation results of a practical study case verify the effectiveness and practicability of the proposed method.