Abstract
This letter proposes a novel hybrid component and configuration model for combined-cycle gas turbines (CCGTs) participating in independent system operator (ISO) markets. The proposed model overcomes the inaccuracy issues in the current configuration-based model while retaining its simple and flexible bidding framework of configuration-based models. The physical limitations—such as minimum online/offline time and ramping rates—are modeled for each component separately, and the cost is calculated with the bidding curves from the configuration modes. This hybrid mode can represent the current dominant bidding model in the unit commitment problem of ISOs while treating the individual components in CCGTs accurately. The commitment status of the individual components is mapped to the unique configuration mode of the CCGTs. The transitions from one configuration mode to another are also modeled. No additional binary variables are added, and numerical case studies demonstrate the effectiveness of this model for CCGT units in the unit commitment problem.
Highlights
The number of combined-cycle gas turbines (CCGTs) in power systems has been substantially increasing because of their high efficiency, operational flexibility, lower natural gas prices, and fast response to mitigate uncertainty with increasing penetration levels of variable renewable generation [1]
A CCGT unit is composed of multiple combustion turbines (CTs) and steam turbines (STs) that can operate in different modes corresponding to different combinations of these turbines
This paper proposes a hybrid component and configuration model for CCGTs in the independent system operator (ISO)’ UC problem
Summary
The number of combined-cycle gas turbines (CCGTs) in power systems has been substantially increasing because of their high efficiency, operational flexibility, lower natural gas prices, and fast response to mitigate uncertainty with increasing penetration levels of variable renewable generation [1]. In the component-based method (CBM), the CTs and STs are modeled individually, and all physical constraints of CTs and STs are respected; it is not likely to provide bidding curves of STs because they generate electricity from the exhaust gas [9] which depends on the status of the CTs. This paper proposes a hybrid component and configuration model for CCGTs in the ISOs’ UC problem. The advantage of the proposed hybrid method is modeling the day-ahead offer submission for CCGT units while respecting the physical constraints for each individual CT and ST component. The components status of a CCGT unit can be mapped to a unique configuration mode (CM) in the following manner: Y. The general formulation of the UC problem including both traditional thermal and CCGT units is presented below
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