PRICE-BASED RAMP-RATE MODEL FOR DYNAMIC DISPATCH AND UNIT COMMITMENT

The ramp-rate limits of generators can significantly impact power syst em operation. As a result, they need to be properly modeled in power s ystem production simulations. This paper presents a price-based ramp-r ate model. This model is particularly suited for application to power system scheduling models that are based on dual formulation (i.e. pric e-based). In this model, the impact of binding ramp-rate limits is ref lected via the hourly marginal ramp-rate values ($/MW-Hr) of generator s. In the paper, the proposed ramp-rate model is applied to price-base d dynamic dispatch and price-based unit commitment. Simple examples ar e used throughout the paper to illustrate the concept of the proposed model.