Two-layer rolling optimal scheduling for distribution network-microgrid coordination based on compensation interaction mode

The strong coupling and coordination between the distribution network (DN) and multiple microgrids are crucial. To address economy, frequent information exchange, and privacy concerns, this paper proposes a two-layer interaction mode of distribution network-microgrid system with compensation mechanism and establishes a corresponding two-layer rolling optimal scheduling model. First, an interaction mode is designed in which microgrids report compensation information and the DN issues power instructions. Then, the adjustable capacity of each microgrid for interactive power is evaluated, and piecewise linear interpolation method is used to construct the compensation function that reflects the cost variation with interactive power. Finally, a two-layer rolling optimal scheduling model is built, the upper layer optimizes the DN, while the lower layer optimizes individual microgrids, with the objective of minimizing the economic cost. Using the compensation function and power instructions as the sole interaction information, the model achieves single-round information exchange, significantly improving interaction efficiency and privacy protection. The microgrids retain sufficient regulation capability for interactive power. The proposed two-layer framework with compensation mechanism effectively controls total system cost, drastically reduces inter-layer communication while enhancing privacy, and yields results nearly identical to the centralized model, error only 0.36%, with cost increase limited to 2.97% across different time scales.