Abstract
Abstract The paper presents the recent research in study of the strategies for the power plant flexible operation to serve the requirement of grid frequency control and load balance. The study aims to investigate whether it is feasible to bring the High Temperature Thermal Storage (HTTS) to the thermal power plant steam-water cycle, to identify the suitable thermal charge and discharge locations in the cycle and to test how the HTTS integration can help support grid operation via power plant dynamic mathematical modelling and simulation. The simulation software named SimuEngine is adopted and a 600 MW supercritical coal-fired power plant model is implemented onto the software platform. Three HTTS charging strategies and two HTTS discharging strategies are proposed and tested via the simulation platform. The simulation results show that it is feasible to extract steam from the steam turbine to charge the HTTS, and to discharge the stored thermal energy back to the power generation processes. With the integration of the HTTS charge and discharge processes, the power plant simulation model is also connected to a simplified GB (Great Britain) grid model. Then the study is extended to test the improved capability of the plant flexible operation in supporting the responses to the grid load demand changes. The simulation results demonstrate that the power plant with HTTS integration has faster dynamic responses to the load demand changes and, in turn, faster response to grid frequency services.
Highlights
The current balance between power generation and load demand is mainly managed through regulating the output of fossil fuel power plants
Many studies have been reported in the area of solar thermal power plant integration with Thermal Energy Storage (TES), in which TES plays an important role to time shifting of energy delivery in an economic way [5,6,7,8,9]
The main contributions of the paper include: the feasible strategies are proposed for High Temperature Thermal Storage (HTTS) charging and discharging processes; the HTTS integration processes are analysed from energy and exergy balance perspectives; further study is conducted to demonstrate HTTS integration for improving the performance of grid frequency control
Summary
The current balance between power generation and load demand is mainly managed through regulating the output of fossil fuel power plants. The paper reports the recent research progress in the integration of High Temperature Thermal Storage (HTTS) with a supercritical boiler power plant to enable the power plant cycle to operate more flexibly while maintaining its thermal efficiency. The thermal inertia of the once-through boiler is smaller than natural circulation boiler, so the capability of offering primary frequency reserve is decreased This motivates to utilize the HTTS in the supercritical coal-fired power plant to provide an. The main contributions of the paper include: the feasible strategies are proposed for HTTS charging and discharging processes; the HTTS integration processes are analysed from energy and exergy balance perspectives; further study is conducted to demonstrate HTTS integration for improving the performance of grid frequency control
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