Research on Optimal Dispatch with Source-Load Coordination for Micro-energy Grid Based on Energy-Carbon Coupling Model

At present, the low-carbon dispatch of the integrated energy system focuses on the means of carbon reduction at the source side, while ignoring the low-carbon potential of the load side and the ability of carbon reduction for source-load coordination. Taking the micro energy grid coupled with power, heat and gas as the research object, an optimal dispatch method with source-load coordination of heterogeneous energy flow system based on energy-carbon coupling model is proposed, and a two-stage optimal dispatch framework of day-ahead and intra-day based on the process of source-load coordination is built. In the source side, the combined heat and power (CHP) units with adjustable heat-to-power ratio coupling with power-to-heat equipment are used for energy supply, and the dynamic carbon emission characteristic of each unit in the energy station is considered; In the grid side, the energy-carbon coupling model of power and heat energy is established by using the carbon emission flow theory, and the obtained distribution of carbon intensity is transferred to the load side; Based on this carbon information and considering the impact of time-sharing energy price, the load side guides the load to adjust behaviors of energy consumption in real time to respond to low-carbon demand, and feeds back the updated load to the source side to re-optimize the output of each unit, so as to realize the process of source-load coordination. The effectiveness of the proposed method is verified by analyzing the micro energy grid composed of the improved IEEE 33-node power grid and the Barry Island 32-node heat grid.