Power-Gas Coordination: Making Flexible Ramping Products Feasible

The power industry has introduced flexible ramping products (FRPs) to improve the operational flexibility that high penetration of renewables requires. However, FRPs are mainly provided by natural-gas-fired power generators, whose capability to provide ramping service is determined by the operational conditions of the natural gas system. We develop a power-gas coordination model that takes into account FRP requirement. Specifically, the power market represents the required energy-FRP co-optimization, while the natural-gas market is settled considering FRP-deployment gas constraints. A Lagrangian coordination scheme is used to identify a market equilibrium involving the two markets that are settled separately. Computations results on two test systems examine the impact of gas-system operating constraints on the delivery of FRPs. Additionally, sensitivity analyses with respect to gas-network bottlenecks, FRP price caps, and renewable penetration levels are presented.