Abstract

In this paper, a mixed integer linear programming (MILP) method is proposed for calculating the optimal energy flow in a regional multiple energy system. A basic model of a regional multiple energy network consisting of electrical distribution network, natural gas network, heat network, electrical boiler and combined heat and power units (CHP) is presented first. The nonlinear gas transmission constraints and mass flow transmission constraints of heat network make the optimal energy flow hard to solve, thus a piecewise linear approximation method is applied to manage the two transmission constraints. Meanwhile, a new variable heat quantity is introduced to combine the hydraulic and thermal calculation together to use the piecewise linear method. Finally, an 85 bus electricity-gas-heat combined energy network is served for demonstrating the proposed method.

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