A Multi-time Scale Dispatch Model for New Energy Grid Connection Considering Generalized Short Circuit Ratio of Operation

To ensure the stable operation of power system during large-scale new energy grid connection and reduce the instances of wind or solar energy curtailment, firstly, an analysis was made on methods for power fluctuation suppression in the new energy grid. Additionally, the generalized short circuit ratio of operation, a parameter for AC power grid strength evaluation after new energy being connected to the grid with arbitrary power, was introduced. Secondly, a dispatch model for new energy grid connection considering three time scales: day-ahead, intra-day and real-time, was presented. Furthermore, a multi-time scale new energy grid connection capacity optimization models was established with the objective functions of minimum operation dispatch cost, maximum operation generalized short circuit ratio, and the minimum fluctuation of joint output power. Finally, taking the system consisting of thermal power units, new energy stations, energy storage power stations and high energy loads as an instance, the effectiveness of proposed strategy and model was verified through simulation.