Study on optimization strategy for short circuit current based on multilevel fuzzy comprehensive evaluation model

An optimal Strategy based on multilevel fuzzy comprehensive evaluation model in restricting short circuit current is presented. This method starts with establishing hierarchical structural diagram of short circuit current limitation measures and multilevel fuzzy comprehensive evaluation model based on Analytic Hierarchy Process. Then the weight values of different levels can be determined by setting up a judgment matrix. Finally, the short circuit current level, steady-state security, transient stability and operation economy is taken into account by introducing fuzzy behavior indices and membership degree function. The limitation scheme can be evaluated systematically, comprehensively and quantificationally through multi-level fuzzy comprehensive evaluation. Simulation is carried out by taking Jingjintang power grid as an example, the feasibility and practicality of the proposed method is verified.