After the fault of the distribution network containing distributed power

the islanding operationcan be used to maintain reliable power supply of loss load of the healthy area and the key to achieve island-ing operation is to make reasonable and effective islanding scheme. For the power distribution grid on con-taining such intermittent power supply as wind and light as well as energy storage device

the charge anddischarge power and electricity capacity of the energy storage device is estimated in accordance with thepredictive data of generation power and load power of the distributed power during the islanding operationperiod after the fault. The mathematical model of island division is set up on the basis of considering inter-mittent output and load need fluctuation of distributed power

the division principle considering energystorage constraints is designed

the dynamic islanding division strategy of active distribution grid based onpower and electricity estimation is proposed

which can guarantee the maximum load recovery after thefault of power distribution network. Finally

the modified IEEE 33-bus distribution system is taken as an ex-ample to verify the feasibility and effectiveness of the proposed strategy by the simulation result.