Abstract
With the ever-growing interconnections of different kinds of energy systems, the integrated electric and heat system (IEHS) has been further developed during the past few years. In this paper, an optimal planning method considering the dynamics of heat system is proposed to minimize the sum of equipment investment cost and system operation cost. Different from power system, it usually takes a certain time for the temperature to transmit inside the pipeline in heat system because of its slow dynamics. The dynamic model of heat system, that can precisely describe the effect of heat loss and delay of heat transport, is established in form of differential equation based on the law of heat conservation. This differential equation is then discretized with the Lax-Wendroff method to reduce the computational complexity. The dynamic model of heat system is considered in the optimal planning method as constraints to achieve better economic benefits by making the most of the time-delay effect on temperature transmission. Simulation results prove that the above planning method is economical and effective.
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