Decentralized Multi-Area Look-Ahead Dispatch for Cross-Regional Renewable Accomodation

High variability of renewable generations poses significant challenges to the secure and economic operation of power systems, especially in terms of ramp scarcity. This paper introduces a multi-area look-ahead coordination framework for real-time dispatch, which guarantees that each region has sufficient ramping capability through a cross-area sharing of ramp resources. This approach allows for a more reliable and economic operation with high renewable variabilities. In the proposed framework, each area dispatch center conducts its own look-ahead optimization with exchanged information about the boundary states and marginal costs of their neighboring areas. Power exchanges are scheduled to deliver ramping supports to areas with large net load variations in the upcoming time steps. A dynamic multiplier-based algorithm is employed for solving the multi-area look-ahead model, which is fully decentralized and thus preserves autonomy for each area. The dynamic multiplier-based algorithm presents the advantage of accelerated computation and better robustness when dealing with stringent ramp constraints. Numerical examples in a 6-bus system illustrate the benefits of conducting multi-area look-ahead coordination.