Security loop closing technology for active distribution network based on synchronous phasor measurement

Aiming at the problem of short-term voltage interruption caused by the switching operation in distribution network, this paper studied the security loop closing technology for active distribution network based on synchronous information measurement. Firstly, the synchronous phasor information on both sides of the loop closing point was measured by the integrated distribution terminal unit (IDU), and the Thevenin equivalent parameter identification method based on the phasor measurement was proposed, improving the network equivalent accuracy. Secondly, the closing loop current calculation method based on identification parameters was proposed, which can effectively estimate the closing loop steady-state current and impulse current. Finally, an actual grid example was given to demonstrate the effectiveness of the proposed method.