Optimal scheduling of flexible ramp product and emerging flexible resources considering short-term variability impacts in power system with high RESs penetration: A novel robust UC approach
Authors
Saberi L., Alizadeh M.I., Parsa Moghaddam M.
Reference
International Journal of Electrical Power and Energy Systems, vol. 142, art. no. 108279, 2022
Description
The short-term variability impacts associated with high renewable energy sources (RESs) penetration in power system will significantly jeopardize the feasible and economically efficient operation of system while necessitating the enhancement of flexibility provision to guarantee the appropriate levels of reliability. To address these challenges, this paper introduces a unique unit commitment (UC) formulation with focus on the allocation and deployment of flexible ramp products. Alongside conventional generation units, emerging flexible resources have recently attracted much attention as desirable options to promote the flexibility degree in power system. Under this perspective, this paper develops a multi-resolution robust UC (RUC) incorporating flexible technologies in a co-optimized energy and reserve market. The proposed model not only optimizes the hourly commitment and dispatch scheduling of resources but also develops a novel nondeterministic flexible ramp product which can be adaptively adjusted into the net-load sudden variations based on intra-hourly intervals. To conquer the drawbacks of the conventional two-stage robust optimization including over-conservativeness, non-causality and heavy computational tractability, and to reduce the sub-optimality gaps brought by the conventional affinely adjustable robust (AAR) methodology, a novel augmented affinely adjustable robust (AAAR) strategy is recommended in the current paper. The superiority of the proposed approach upon the conventional AAR counterpart (AARC) is also investigated from both theoretical and practical aspects. Then, the merits of the coordinated operation of flexible resources are evaluated through the extensive comparisons. The applicability of the proposed model is validated by the results of the numerical tests conducted on both IEEE 24-bus reliability test system (RTS) and the IEEE 118-bus test system.
Link
doi:10.1016/j.ijepes.2022.108279
