Abstract
Improving electricity and heat utilization can speed up China’s decarbonization process in the northwest villages on the Qinghai-Tibet Plateau. In this paper, we proposed an architecture with zero-carbon-emission micro-energy network (ZCE-MEN) to increase the reliability and flexibility of heat and electricity. The advanced adiabatic compressed air energy storage system (AA-CAES) hybrid with solar thermal collector (STC) is defined as hybrid adiabatic compressed air energy storage system (HA-CAES). The ZCE-MEN adopts HA-CAES as the energy hub, which is integrated with power distribution network (PDN) and district heating network (DHN). The STC can greatly improve the efficiency of HA-CAES. Furthermore, it can provide various grades of thermal energy for the residents. The design scheme of HA-CAES firstly considers the thermal dynamics and pressure behavior to assess its heating and power capacities. The optimal operating strategy of ZCE-MEN is modeled as mixed-integer nonlinear programming (MINLP) and converts this problem into a mixed-integer linear programming problem (MILP) that can be solved by CPLEX. The simulation results show that the energy hub based on HA-CAES proposed in this paper can significantly improve ZCE-MEN efficiency and reduce its operation costs. Compared with conventional AA-CAES, the electric to electric (E-E) energy conversion efficiency of the proposed system is increased to 65.61%, and the round trip efficiency of the system is increased to 70.18%. Besides, operating costs have been reduced by 4.78% in comparison with traditional micro-energy network (MEN).
Highlights
In recent years, many nature reserves have been established in the Qinghai-Tibet Plateau due to increasing emphasis on environmental protection and sustainable development in China
Function This article assumes that the Hybrid adiabatic compressed air energy storage (HA-compressed air energy storage (CAES)) hub, the heat collected by Solar thermal collector (STC), and the heat pump are the thermal sources in the proposed Zero-carbon micro-energy network (ZCE-Micro energy network (MEN)), and the heat pump is the standby thermal source
A HA-CAES hub coupled with STC is installed at bus 2
Summary
Many nature reserves have been established in the Qinghai-Tibet Plateau due to increasing emphasis on environmental protection and sustainable development in China. Emission; 2) The coupling of the STC module with external heat source improves the inlet temperature of the turbine which improves the system efficiency; 3) Compared with traditional MEN, the operation of ZCE-MEN is optimized to reduce solar curtailment and operating costs. Where PCs,tAESG is the electricity generation of sth stage turbine at the time t ; ηCs AESG is the adiabatic efficiency of sth stage turbine; qmCs,tAESG is the mass flow rate of air of sth stage turbine; TCs,tAESG,in is the input temperature of the sth stage turbine; pCs,tAESG,in , and pCs,tAESG,out are the input and output air pressure of sth stage turbine. Where HCr,tAESG and HCncA,tESG are the thermal collected by rth stage cooler; ca is the constant pressure-specific heat of air; TET is the environment temperature. Where Hstt is the heat recovered by the system at period t ; Hsmtin and Hsmtax are limits of thermal that can be stored in the system
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