Multi-objective Optimal Configuration of AC/DC Microgrid Considering Electricity/Heat Coupling

With the development trend of the increasingly close electricity-heat connection and the maturity of AC/DC microgrid, a bi-level optimal configuration model considering electricity/heat coupling for AC/DC hybrid microgrid is proposed. This model takes the annual investment cost, annual CO2 emission and transmission loss as the optimization objectives with consideration of the electric/heat power balance, self-government and other operation constraints as well. The upper layer is the capacity planning model of each device in the microgrid, and the lower layer determines the operation strategy of each device in the microgrid. Through the joint optimization of the upper and lower levels, the capacity configuration of each device in the microgrid is studied. By comparing different planning scenarios, the influence of electricity/heat coupling system on optimization objectives is analyzed. Through annual equipment power output and power balance curve of typical days, the energy supply reliability of AC/DC microgrid with electricity/heat coupling system is illustrated. Finally, the rationality and effectiveness of the model are verified. © 2020 Automation of Electric Power Systems Press.