Research on Optimal Configuration Method of Two-stage Protection for Distribution Lines Based on Distribution Information of Distribution Transformers

In order to further narrow down the fault outage scope of two-level protection configuration scheme for distribution lines, according to the nature of power supply reliability of distribution lines, an optimization scheme based on minimizing the transformer capacity of outage distribution is proposed, and the objective function of the expected total capacity of outage is established. A feasible calculation method of objective function is proposed. The infinite problem which is difficult to solve is transformed into a simple finite discrete problem. The optimal solution and its corresponding two-level protection configuration scheme are obtained by traversing and comparing. Based on this, according to the characteristics of distribution lines, a computer automatic solution algorithm is developed, and the displaying of distribution lines and the automatic calculation of optimal configuration of two-level protection are realized by software programming. Through the manual calculation of the results of computer software operation, the correctness of this method and the rapidity of software algorithm programming are proved.