Two-step optimization and decision model for opening electromagnetic loops

In order to improve the grid safety and stability, we put forward a two-step optimization and decision method for opening electromagnetic loop circuits. Firstly, several parts from the low voltage level network are separated in the electromagnetic loop circuit using the GN dividing algorithm and complex network theory according to the distribution of center stations and the characteristics of network structures. The scheme set for opening electromagnetic loop circuits is generated in accordance with the sequence that every part separated from the network in the dividing process. Then, aiming at the contradiction between improving the system stability and limiting the short circuit current, a comprehensive evaluation model based on the analytic hierarchy process is built. The systematic and quantitative assessments on opening electromagnetic loop circuits are realized by the fuzzy comprehensive evaluation algorithm. Case studies verify the effectiveness of the proposed strategy.