HAN He,ZHANG Peichao,DU Wei,et al.Joint Optimal Power Flow of District Heat-Electric System in Quantity Regulation Mode[J].Automation of Electric Power Systems,2021,45(2):30-36.
HAN He,ZHANG Peichao,DU Wei,et al.Joint Optimal Power Flow of District Heat-Electric System in Quantity Regulation Mode[J].Automation of Electric Power Systems,2021,45(2):30-36. DOI: 10.7500/AEPS20200707003.
Joint Optimal Power Flow of District Heat-Electric System in Quantity Regulation Mode
Quantity regulation is a basic regulation mode of district heating networks. First
aiming at the characteristics of the quantity regulation that the flow is variable and in the turbulent resistance square area
a second-order cone relaxation method for pressure drop of hydraulic branches is proposed
and a penalty cost term is introduced to ensure exact relaxation. Second
according to the characteristics of the stable thermal condition of quantity regulation
a equivalent heat loss method of thermal branches is proposed. The heat loss of the pipeline is equivalent to the load to form a lossless pipeline
which realizes the independent analysis of hydraulic and thermal models. Then
combined with the branch flow model of the distribution network
a joint power flow model of the district heat-electric system is built. Furthermore
a joint optimal power flow model with the form of convex-concave programming for the district heat-electric system is established. Finally
the optimization model is transformed into a second-order cone programming problem and solved sequentially. Simulation cases show that compared with the non-convex accurate model
the proposed method retains a high solution accuracy
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