Multi-objective optimization and selection of hybrid combined cooling, heating and power systems considering operational flexibility

Wang, Jiangjiang; Liu, Yi; Ren, Fukang; Lu, Shaohua

doi:10.1016/j.energy.2020.117313

Cited by 66 publications

(11 citation statements)

References 35 publications

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“…The adjustable ability of the heat and electricity (β) is expressed as follows where Q u , max and E u , max are the maximum heat and electricity loads required by users, respectively (kW); and Q max and E are the maximum output heat and electric quantity of the coupled CHP system with TES, respectively (kW).…”

Section: Methodologiesmentioning

confidence: 99%

Thermodynamic and Economic Analysis of a Gas-Turbine Combined Heat and Power Plant Considering Operational Flexibility

Wang

Liu

2020

Energy Fuels

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The operational flexibility is improved to decouple the thermoelectric limitation of the combined heat and power (CHP) system and meet the dynamic changes of heat and electrical loads in an affordable economic and thermodynamic cost. A gas-turbine CHP system combined with thermal energy storage of molten salt is proposed in this paper. The thermodynamic models of components are constructed and simulated in Ebsilon, and the indicators are defined to evaluate thermodynamic and economic performances and operational flexibility of the coupled CHP system. The thermodynamic analysis indicates that under the design conditions, when CHP operates without thermal energy storage, gas turbine has the largest energy and exergy losses due to the combustion irreversibility, accounting for 51.28 and 55.76% of total energy and exergy losses, respectively. In addition, the effects of thermal energy storage capacity on system performances are analyzed and discussed. The results indicate that when the capacity of the thermal energy storage increases from 0 to 2000 kWh, the primary energy ratio is decreased by 4.56%, the exergy efficiency only declines by 0.74%, and the economic revenue of the system is also reduced by 15.70%. But the adjustable ability of the heat and electricity is increased by 44.84%. The optimal thermal energy storage size of the CHP plant is comprehensively determined according to the integrated benefits of energy, economic, and operation flexibility.

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Section: Methodologiesmentioning

confidence: 99%

Thermodynamic and Economic Analysis of a Gas-Turbine Combined Heat and Power Plant Considering Operational Flexibility

Wang

Liu

2020

Energy Fuels

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“…If the interaction is less, it is shown that the micro-grid has higher operational flexibility (Perera et al, 2013). Usually, the interaction can be evaluated in the grid integration level and the net interaction level, and they are respectively defined as (Wang J et al, 2020): (18) in which P L is the electricity load of users. The multi-objective functions are adopted to evaluate the performances of the micro-grid, and there are two cases to be constructed as follows: Case 1.…”

Section: Flexibility Performancementioning

confidence: 99%

Robust Optimization of Micro-Grid of Natural Gas and Renewable Energies Considering Operational Performances and Flexibility

Zhang

2022

Front. Energy Res.

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The micro-grid based on renewable and fossil energies relieves environmental pollution due to fuel pollutant emission and offsets renewable energies’ instabilities. A micro-grid integrated with wind, solar, and natural gas is proposed. Primary energy saving rate, annual total cost saving rate, and carbon dioxide emission reduction rate are employed to evaluate the energetic, economic, and environmental performances of micro-grid, and grid integration level and net interaction level between micro-grid and national grid are used to show its system operational flexibility. The multi-objective robust optimization model considering these indicators in non-dominated sorting genetic algorithm II is constructed, in which the linear regression models fitted using points in the neighborhood of each candidate solution are used to present sensitivity analysis for the selection process of optimal solutions. The simulations in a case study demonstrate the validation of the proposed optimization model. The results show that the primary energy saving rate, annual total cost-saving rate, and CO2 reduction rate are decreased by 1.7, 19.8, and 1.2%, respectively, when integrating system flexibility into optimization objectives.

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“…Due to the heat and electricity output from the CPC-PV/T subsystem, the hybrid system has a larger ability to adjust to the space heating output. Here, an excess adjustable ratio, , is defined as a ratio of the total space heating output from CPC-PV/T to the space heating load [32]:…”

Section: Flexibilitymentioning

confidence: 99%

Integrated performance analysis of a space heating system assisted by photovoltaic/thermal collectors and ground source heat pump for hotel and office building types

et al. 2021

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Multi-objective optimization and selection of hybrid combined cooling, heating and power systems considering operational flexibility

Cited by 66 publications

References 35 publications

Thermodynamic and Economic Analysis of a Gas-Turbine Combined Heat and Power Plant Considering Operational Flexibility

Thermodynamic and Economic Analysis of a Gas-Turbine Combined Heat and Power Plant Considering Operational Flexibility

Robust Optimization of Micro-Grid of Natural Gas and Renewable Energies Considering Operational Performances and Flexibility

Integrated performance analysis of a space heating system assisted by photovoltaic/thermal collectors and ground source heat pump for hotel and office building types

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