Multi-time Scale Active and Reactive Power Coordinated Dispatch on Distribution Network with Distributed Generators

A large number of distributed generators (DG) has been integrated into the distribution network, which has changed its flow and brought challenges to the existing dispatch methods. To cope with the fluctuating power caused by these DG in the distribution network, a multi-time scale active and reactive power coordinated dispatch method is proposed in this paper. Firstly, based on the prediction of renewable energy output in the next 24 hours, the operational output of DGs and energy storage (ES) is optimized in the day-ahead stage. Then, combining the latest prediction data and the reference value from the day-ahead stage, the intra-day stage is conducted every 4 hours. Thus, the operational cost is minimized, and the power fluctuation caused by DG to the main grid is reduced. Finally, simulation results verified the effectiveness of this method.