A new energy state-based modeling and performance assessment method for primary frequency control of thermal power plants

• Published in: Energy (Oxford) Vol. 276; p. 127594
• Main Authors: Hong, Feng, Ji, Weiming, Pang, Yalei, Hao, Junhong, Du, Ming, Fang, Fang, Liu, Jizhen
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2023
• Subjects: Capability assessment; Dynamic response; Energy state; Primary frequency control; Thermal power plant; Dynamic response; Energy state; Primary frequency control; Capability assessment; Thermal power plant
• ISSN: 0360-5442
• DOI: 10.1016/j.energy.2023.127594

Primary frequency control (PFC) has become increasingly important for the stable operation of power systems due to the development of renewable energy resources, and the thermal power units still need to provide satisfactory PFC services. The energy stored in metal and working fluid are the main impact factors for PFC. This paper proposed a universal assessment mechanism to evaluate PFC capability for thermal power plants under various working conditions by decomposing and quantifying the energy state, especially under flexible operating processes. A transient heat current model describes the dynamic process by constructing the relation of different parameters in overheated components at various energy states. In this study, the PFC dynamic response ability of a 600 MW supercritical power plant under various working conditions is quantified based on the proposed modeling. The maximum load regulation amount decreases from 6.0% to 1.69% with a decrease in the load. Compared to the theoretical calculation results with the experimental data of actual PFC tests, the proposed mechanism of the dynamic response of PFC assessment is more precise, with an accuracy of 97.85%, which has a significant meaning in guiding the PFC services in the power grid and regulating the power plants. •Constructed a new energy state-based model by heat current method.•Proposed a novel PFC capability assessment model under dynamic processes.•Considered the boiler and the turbine sides in the PFC simultaneously.•Validated the new model with various frequency deviations by field experiments.