Microgrid technology for low voltage distribution transformer station area

Large-scale distributed power supply, energy storage and electric vehicles are distributed into the distribution network, resulting in frequent bidirectional overrun of power supply voltage at the user side, power flow reversal at the station area, harmonic overrun and other issues, which have a signifcant impact on the power quality, operation economy and reliability of distribution network. A new micro-grid confguration method for low-voltage distribution transformer area is presented. The technical framework, functional framework and control objectives of the micro-grid oriented to lowvoltage distribution transformer area are systematically described. A two-stage coordinated control model based on the micro-grid is established. Through the coordinated control and optimal dispatch of the micro-grid, the optimal grid-connected and effcient generation of distributed generation are realized. The validity of the method and model is validated by the simulation calculation of typical microgrid.