Hybrid Timescale Dispatch Hierarchy for Combined Heat and Power System Considering the Thermal Inertia of Heat Sector

To better accommodate the uncertainty introduced by renewables and loads, a hybrid timescale dispatch hierarchy for the combined heat and power system is constructed in this paper, which coordinates the stages of day-ahead dispatch, intraday rolling dispatch, real-time dispatch, and automatic generation control to decompose the uncertainty step by step. Considering the different features of heat and power sector, heating units should have different dispatch intervals from power units in each dispatch stage. Therefore, a method considering the extra operation and maintenance costs of frequent adjustment, the operation modes of district heating network (DHN), and the heat storage capacity of buildings is developed to determine the optimal dispatch interval of each unit. The thermal inertia of heat sector is also integrated into the dispatch model to improve wind power consumption. The model of buildings directly links the indoor temperature with the temperature of supplied water and can be easily applied to determine the state of DHN. Results of the case study validate the feasibility and effectiveness of the proposed dispatch method in terms of enhancing the economical efficiency and wind power consumption.