Multi-source Joint Optimal Scheduling of Wind-PV-thermal-storage with Frequency Modulation Capability of Energy Storage

As renewable energy sources are increasingly connected to the grid, its fluctuating and intermittent nature has brought difficulties and challenges to peak and frequency modulation of the grid. Accordingly, based on the state of charge (SoC) partition of electrochemical energy storage, the SoC-based energy storage peak and frequency modulation work area zoning method is proposed. On this basis, with the minimum variance of net load as the upper optimization goal and the minimum operating cost of the power grid as the lower optimization goal, a two-layer optimal dispatching model is established. Finally, the IEEE-39 system is selected as an example system for analysis, and the results verify the validity and feasibility of the proposed model.