Abstract

Recently, multi-energy systems based on energy hub are introduced because of significant benefits in reducing energy and emission cost. This paper proposed an optimal schedule model of multi-energy hubs networks consisting of energy hubs, renewable sources, and energy storage which are connected by electrical and natural gas distribution networks. In the proposed mixed-integer nonlinear programming model, the objective is to minimize the operation, energy, and emission costs of energy hubs with both renewable sources and storage and energy distribution networks. The proposed schedule framework allows simultaneously selections of optimal operation structure of EHs together with the optimal operation parameters of energy distribution networks and therefore this model can maximize the profit of the entire large-scale multi-energy hubs network. Besides, the operation parameters and energy loss of both electrical and natural gas distribution networks are considered in conjunction with optimal operation of energy hubs and thus guarantee the operation and optimization of the network in all operational scenarios. The IEEE 5-bus test system is utilized to demonstrate the applicability of the proposed model. The simulation results show the feasibility of the proposed model, and demonstrate that the energy hubs, renewable sources, and energy storage in the proposed structure significantly enhance the efficiency of the multi-energy hubs network by reducing not only energy and operation costs but also emission.

Highlights

  • Energy Hub (EH) has been introduced and applied in multi-energy systems in combination with renewable resources because of its significant benefits in reducing energy and emission cost [1]-[3]

  • In each node of the energy distribution network, an EH with a typical structure introduced in figure 2 is connected to receive the energy from a distribution network

  • The total conversion efficiency of combined heat and power (CHP) is 0.85 with 40% converted to electricity and 45% converted to heat

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Summary

INTRODUCTION

Energy Hub (EH) has been introduced and applied in multi-energy systems in combination with renewable resources because of its significant benefits in reducing energy and emission cost [1]-[3]. Thang) stage is to schedule for the exchange power between the distribution network and the EHs with the constrained condition of each EH obtained in the first stage In these studies, the energy storage devices, which have a significant influence on the effectiveness of the EH integrated renewable sources, were not considered. The structure and optimal schedule model of a multi-energy hubs network consisting of EHs, renewable sources, energy storages, and both electrical and natural gas networks are proposed. Optimizing the energy and operation costs of all networks including EHs. Renewable sources and storage and energy distribution networks consisting of electric and natural gas distribution networks are simultaneously determined in a mixed-integer nonlinear programming problem.

NETWORK AND ENERGY HUB MODELING FORMULATION
Modeling of natural gas network
MATHEMATICAL MODEL
Objective function
Constraints
Test structure and assumptions of case study
CONCLUSION
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