A Modified Method for PSC Evaluation of Distribution System

In Power Supply Capability evaluation, the method based on the interconnections among main transformers produces the exceeding margin. Taking the cause into consideration, this paper proposes a method to correct the load rate matrix of interconnection schemes that is based on the advantages of the former method. Firstly, the minimum load rate of each interconnection scheme is searched and recorded, according to which the same column are corrected. Secondly, the margins produced in the former step are distributed to each main transformer of the same interconnection scheme according to the N-1 guideline. The method completes after the traversal of load rate matrix. Finally, it is demonstrated that this method obtains a more accurate result by the calculation of practical example.