Reasonable operating system building and hierarchical partitioning coordinated control method can achieve the function of initiative decision-making

management and control in the operation process of active distribution network

and ensure the reliability of grid power supply and economy of running. A three-layer control system framework based on multiple time scales in an active distribution network is built; a hierarchical partition coordinated control method is proposed for goal decision-making ahead of schedule

global centralized optimization

and regional decentralized autonomy. Each autonomous region with active distribution network accepts a planned target of power given by global optimization for real-time calibration. The disturbance critical switching index is proposed to quantify the disturbance in the operation of the system

acting as the basis for the control of the active switch. Using this as the basis

with the feeder power control error(FCE)as the control objective

the power adjustment strategy in short time scale is developed to track the global optimization objective given by the higher level

and then achieve non-differential control. Simulation results show the effectiveness of the proposed strategy in different scenarios.