Integrated Heat and Electricity Dispatch Based on an Encrypted Equivalent Modeling Method of Heating Network

The dispatch problem of integrated energy systems faces a contradiction between the unified modeling and privacy protection issues as various energy systems belong to different sectors. An encrypted equivalent modeling method is proposed to construct the feasible region of district heating system (DHS) considering its thermal inertia and elasticity. A sensitivity modeling method is adopted to equivalently construct the feasible region of DHS and hide its absolute state information. The relative state information and structural parameters of DHS is further reduced and encrypted through the redundancy-constraint-elimination technology and an equivalent constraint-transformation technique. Then, based on the DHS equivalent model, a non-iterative dispatch model was constructed for thermal and power systems. The dispatch model can fully utilize the elasticity of DHS and guarantee to obtain the global optimization. Case studies verifies the equivalence of the proposed encrypted feasible region model of DHS and the improvement in solving efficiency for the optimal dispatch problem. The solution time is reduced by two orders of magnitude compared to the heat-power iterative solution method. The redundancy-constraint-elimination technology further reduces the solution time by more than half. Economy and flexibility improvement brought by the elasticity of DHS to power systems are also verified.