Reactive Power Optimization Model of Multi Energy System Based on Pipeline Pressure Characteristics

For electricity, heat and gas multi-energy systems the coupling relationship between heating and gas system pipe network pressure regulation and grid reactive power balance. This paper proposed a grid reactive power optimization model suitable for multi-energy systems, which based on the reactive power demand characteristics of the heat and gas system energy transmission process. First, the reactive power demand characteristics of the energy transmission process of the multi-energy system, the reactive power output characteristics of various power sources and their uncertainty were studied. A reactive power balance and its uncertainty model for multi-energy systems were established. Secondly, the pressure adjustable limit parameters of the energy medium transportation pipelines of the heating network, the gas network and the corresponding reactive power demand capacity were studied. A quantitative model for the reactive power adjustable capacity of heating and gas networks were established. Then, considering the uncertainty of the reactive power balance of the multi-energy system and the constraints of the source-network load-storage operation, the cost of reactive power balance and the minimum fluctuation of grid voltage were taken into consideration. A reactive power multi-objective dynamic evolutionary optimization model for multi-energy systems was established. Finally, based on the operating data of an electric heating gas multi-energy system. A multi-energy system reactive power optimization simulation model that comprehensively considers operating constraints and thermal and gas network constraints was established. The simulation results and analysis showed that the reactive power optimization control method proposed in this paper could make full use of the reactive power adjustable capacity of the gas network and heating network, and effectively improve the reactive power regulation capacity and voltage stability of the multi-energy system.