Optimal Energy Scheduling of Photovoltaic Natural Gas, Cooling, Heating and Power Co-supply Park Micro-network

Natural gas, cooling, heating and power co-supply park micro-network provides cooling, heating, power and natural gas supply functions, and has the advantage of energy cascade utilization. It can effectively improve the energy utilization rate and reduce the emission of pollutants. Aiming at the energy optimal dispatch pro-blem of natural gas, cooling, heating and power co-supply park micro-network, and taking the minimum operating cost as the objective function, a multi-period dynamic optimal scheduling model of the natural gas, cooling, heating and power co-supply park micro-network was established. It considered both the network operation characteristics of the cooling network, heating network, power supply network and natural gas supply network, and the influence of multiple energy storage devices including electricity storage, cooling storage and heating storage on the microgrid dispatch. Based on the scenario method, an optimal energy dispatching model of co-supply park micro-network considering the stochastic fluctuation of photovoltaic output was established, and the uncertain fluctuation of PV output was balanced by rapidly adjusting the stored power of the energy storage device. Taking a natural gas, cooling, heating and power co-supply park micro-network as an example, the correctness and effectiveness of the proposed optimal scheduling model were verified. The optimization results show that the proposed operation scheduling scheme of micro-network can effectively save the energy consumption and reduce its operating cost; the coordinated operation of multiple energy storage devices can more effectively reduce the operating cost of the micro-network and help to stabilize the uncertain fluctuations of PV power generation. © 2019, Editorial Department, Journal of South China University of Technology. All right reserved.