The Closing loop Current Analysis and Scheme Optimization of Urban Power Grid

Grid closing loop control of urban power has become a conventional method of urban power grid dispatching. In the process of the closing loop, the short time state abnormality and the large current of the closing loop cause some backup protection incorrect action. It may seriously affect the security operation of the power grid and the normal power supply of the load. Based on the domestic and foreign research results on the closing loop current, the formation mechanism and effect factors of closing loop current are analyzed theoretically from the principle level of the power system. The generation mechanism and effect factors of steady and transient closing loop current are analyzed. A method to control the closing loop current is put forward theoretically through an example analysis. It can guide the dispatcher to estimate and control the closing loop current level in a long time and help the dispatcher to decide the switching operation.