Abstract
A solar-assisted natural gas distributed energy system (DES) with energy storage is proposed to determine the optimal configuration of the DES in this study. A mixed-integer nonlinear programming (MINLP) model is established considering the part-load performances of devices and the annual total cost (ATC) as objective. Taking an energy center in Jinan, China as the objective building, three scenarios of different structural DESs are designed in which different candidate devices of a certain type of equipment are listed, and the optimal configurations and the energy management strategies are studied. The results show that in comparison with the conventional DES (Scenario 1), the ATCs of the DES with solar energy (Scenario 2) and the solar-assisted natural gas DES with energy storage (Scenario 3) are decreased by 2.90% and 7.48%. The economy and flexibility of the power grid is verified to regulating the electrical load of DES. The sensitivities of the DES to energy price changes are analyzed and the DES is more sensitive to the natural gas price under the research ranges. The model and method can be applied to practical engineering and give guidance on device operation.
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