Hybrid-timescale dispatch of heat and electricity integrated system considering dynamic heat flow

Abstract

In the electricity and heat integrated energy system, the transmission speed of heat energy is much slower than that of electricity. While the ignorance of the dynamic characteristic of heat system during the dispatch process often fails to satisfy the heat load. To address this issue and further improve the flexibility of the system, a dynamic linear model of heat pipeline is proposed, and a hybrid-timescale optimal dispatch strategy is established in this paper. Firstly, based on the finite difference method, the partial differential equation of heat pipeline is converted into a linear equality constraint. Then, a hybrid-timescale optimal dispatch model is established. By considering different dynamic characteristics of heat and power system, the calculation of dynamic linear model and dispatching of devices of power and heat system are realized under three different timescales. Finally, by using MATLAB, the effectiveness of the proposed dynamic model is validated compared with the conventional steady-state model and measured data. A series of simulation results verify that the proposed hybrid-timescale optimal dispatch strategy considering dynamic model helps the system to increase the supply rate of the heat load by 100% and decrease the economic cost,CO2andNOxemission by 0.79%, 0.2%, and 18.9%, respectively.