Optimal scheduling for power system peak load regulation considering short-time startup and shutdown operations of thermal power unit. (October 2021)

• Record Type: Journal Article
• Authors: Shi, Yiwei; Li, Yipu; Zhou, Yun; Xu, Ran; Feng, Donghan; Yan, Zheng; Fang, Chen
• Is Part Of: International journal of electrical power & energy systems. Volume 131(2021)
• Publication Date: 2021-10
• Subjects: Power system peak load regulation -- Thermal power unit short-time startup and shutdown operations -- Unit commitment -- Optimal scheduling model; Electrical engineering -- Periodicals; Electric power systems -- Periodicals; Électrotechnique -- Périodiques; Réseaux électriques (Énergie) -- Périodiques; Electric power systems; Electrical engineering; Periodicals; 621.3
• DOI: 10.1016/j.ijepes.2021.107012
• Languages: English
• ISSNs: 0142-0615

Abstract

Highlights: The intrinsic capacity of the thermal units in the system peak load regulation is studied on the generation side. An improved linear UC model considering startup and shutdown trajectories of thermal power units is embedded with the peak load regulation compensation rules. A real prefecture-level urban power system, and its modified test systems are used to verify the proposed methodology. Abstract: To balance the peak–valley difference of the system load in electrical power systems, the peak load regulation problem has become a major barrier, resulting in challenges to unit commitment (UC). In addition to the new construction of specific system peak load regulation resources on the generation side and the demand response programs on the demand side, this paper focuses on the capacity of thermal power units in system peak load regulation. Considering the temporal distribution of system load off-peak hours, the potentiality of the deeper peak load regulation mode and the short-time startup and shutdown regulation mode of thermal power units are analysed. This paper presents an optimal scheduling model for power system peak load regulation considering the short-time startup and shutdown operations of a thermal power unit. First, an improved linear UC model considering the thermal units' startup and shutdown trajectories is established. Next, for different peak load regulation modes of thermal units, the corresponding peak load compensation rules are processed and converted into linear formulations. An integrated optimal scheduling model for power system peak load regulation with a suitable rolling optimization strategy is proposed. A real prefecture-level urban power system in southwest China and its modified test systems are used to test and verify the validity and effectiveness of the proposed methodology.