Optimal Planning Model for Integrated District Energy Systems Considering Electricity and Gas Distribution Networks

In this paper, an optimal planning model is developed for the integrated district energy system to explore the synergy between different energy forms. The individual operating characteristics of electric distribution networks and natural gas pipes are both taken into account, as well as the coupling components. The nonlinearity lying in the energy transportation and conversion is managed by the piecewise linearization method. Thus, a mixed integer second-order cone programming (MISOCP) model is constructed which can be solved by the off-the-shelf tool efficiently. The case studies have been carried out on the modified IEEE-33 system, which verifies the validility and effectiveness of the proposed method. The test results also show the investment and operation cost of district energy systems can be reduced significantly via the coordinated planning of electricity and gas distribution networks.