Abstract
This chapter introduces the mathematical model of multi-energy systems, which consists of electric power, district heating and natural gas systems. The integration of multiple energy systems has become a promising solution for the future renewable based energy system. Integrated energy systems can improve energy efficiency and reduce CO2 emissions. The electric power and district heating system are introduced and interconnected through coupling devices in both the energy source side and energy consumption side. Combined heat and power plant generates electricity and heat simultaneously, whereas heat pumps and electric boilers produce heat by consuming electric power. Further on, this chapter describes the modeling of the natural gas network and establishes the connection of the natural gas network to different energy sectors to achieve the optimal economic operation of the multi-energy system. An overview of natural gas modeling is given, and a mathematical model is formulated.
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