Two-stage Robust Unit Commitment Considering Coordination of Thermal Power Units and Grid Scale Battery Energy Storage Station

The high penetration of new energy sources and the gradual replacement of traditional units have made the power system's ability to cope with high-power loss prominently insufficient. A Large-scale battery energy storage station on the grid side (BESS-GS) is used as an independent power generation unit under the unified deployment of dispatching instructions to provide a feasible way to solve this problem. In this paper, a two-stage robust unit commitment model is established, in which a BESS-GS and thermal power units are coordinated to dispatch to participate in auxiliary services, and the economy is optimized under the premise of ensuring grid security. The first stage is based on the deterministic model to obtain the benchmark output plan; the second stage focuses on the uncertainty of the actual wind power output, adopts the robust optimization method to establish the model, and modifies the benchmark value. Finally, the validity and practicability of the proposed method in this paper are verified through a standard case. The method can be better applied to a strong and large power grid.