scholarly journals Operation optimization of multi-energy flow integrated energy system based on multi-objective

2020 ◽  
Vol 213 ◽  
pp. 02022
Author(s):  
Yongli Wang ◽  
Xin Chen ◽  
Lisha Fan ◽  
Minhan Zhou ◽  
Huanran Dong ◽  
...  
Keyword(s):  
Environmental Protection ◽  
Energy Flow ◽  
Gas Turbines ◽  
Energy System ◽  
Operation Strategy ◽  
Operation Optimization ◽  
Integrated Energy Systems ◽  
Integrated Energy System ◽  
Combined Cooling ◽  
Electric Loads

In order to solve the problem that most of the existing combined cooling, heating and power integrated energy systems only consider the investment cost of the system unit or the system environmental pollution affecting the overall optimization of the system, with the goal of system economy and environmental protection, the construction of gas turbines, gas boilers, The optimization model of the combined cooling, heating and power system of electric refrigerators and other units and the establishment of constraint conditions; according to the requirements of the cooling, heating, and electric loads in the dispatch cycle, as well as the energy supply efficiency of each equipment of the system, the starting and stopping power and other operating parameters are in the interval. Based on the respective data, a multi-energy flow regional integrated energy system economic dispatch optimization operation strategy optimized within the dispatch period is proposed. The results show that the operation strategy can take into account the economy and environmental protection of the system at the same time, make the system operation more optimized.

scholarly journals Research on Operation Optimization Strategy of Integrated Energy System Considering Ground Source Heat Pump

2020 ◽  
Vol 165 ◽  
pp. 01013
Author(s):  
Linfeng Wang ◽  
Kai Zhang ◽  
Nan Xu ◽  
Jingyan Wang ◽  
Danyang Zhang ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Energy System ◽  
Heat Pumps ◽  
Optimal Operation ◽  
Energy Prices ◽  
Operation Strategy ◽  
Ground Source Heat Pumps ◽  
Operation Optimization ◽  
Ground Source ◽  
Integrated Energy System

With the depletion of fossil energy and the popularity of renewable energy, a comprehensive energy system with the goal of improving system energy efficiency and consuming renewable energy is booming. Based on the combined heat, power, and heat generation, this paper builds a comprehensive energy system operation optimization model in conjunction with ground source heat pumps. It aims to find the optimal operation strategy based on the actual situation of the park’s load, equipment capacity, and energy prices. Using the linear programming method, a mathematical model with the best economic efficiency of the integrated energy system is established, the optimal operation strategy for a typical day is analyzed, and the annual operation is simulated. Finally, it compares with conventional energy supply methods and analyzes the contribution to the consumption of renewable energy.

scholarly journals Optimal Planning of Integrated Energy Systems Based on Coupled CCHP

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2621 ◽  
Author(s):  
Xiaofeng Dong ◽  
Chao Quan ◽  
Tong Jiang
Keyword(s):  
Power Generation ◽  
Energy Use ◽  
Clean Energy ◽  
Energy System ◽  
Power Lines ◽  
Gas Pipelines ◽  
Integrated Energy Systems ◽  
Integrated Energy System ◽  
Gas Price ◽  
Combined Cooling

With the widespread attention on clean energy use and energy efficiency, the integrated energy system (IES) has received considerable research and development. This paper proposed an electricity-gas IES optimization planning model based on a coupled combined cooling heating and power system (CCHP). The planning and operation of power lines and gas pipelines are considered. Regarding CCHP as the coupled hub of an electricity-gas system, the proposed model minimizes total cost in IES, with multistage planning and multi-scene analyzing. Renewable energy generation is also considered, including wind power generation and photovoltaic power generation. The numerical results reveal the replacing and adding schemes of power lines and gas pipelines, the optimal location and capacity of CCHP. In comparison with conventional separation production (SP), the optimization model which regards CCHP as the coupled hub attains better economy. At the same time, the influence of electricity price and natural gas price on the quantities of purchasing electricity and purchasing gas in the CCHP system is analyzed. According to the simulation result, a benchmark gas price is proposed, which shows whether the CCHP system chooses power generation. The model results and discussion demonstrate the validity of the model.

scholarly journals Research on Battery Energy Storage as Backup Power in the Operation Optimization of a Regional Integrated Energy System

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2990 ◽  
Author(s):  
Jianfeng Li ◽  
Dongxiao Niu ◽  
Ming Wu ◽  
Yongli Wang ◽  
Fang Li ◽  
...  
Keyword(s):  
Energy Storage ◽  
Simulation Optimization ◽  
Energy Systems ◽  
Energy System ◽  
Power Source ◽  
Battery Energy Storage ◽  
Operation Optimization ◽  
Integrated Energy Systems ◽  
Integrated Energy System ◽  
Battery Energy

Recently, integrated energy systems have become a new type of energy supply model. It is clear that integrated energy systems can improve energy efficiency and reduce costs. However, the use of a battery energy storage system (BESS) as a backup power source will affect the operating costs of a regional integrated energy system (RIES) in different situations. In this paper, a regional integrated energy system including wind turbines, photovoltaics, gas turbines and battery energy storage was introduced. In order to obtain the minimum operation cost, an operation optimization model was built. The schedule plans of each unit were optimized by a moth flame optimization (MFO) algorithm. Finally, three different scenarios were proposed for the simulation optimization. The simulation optimization results show that when the BESS is used as a backup power source, the operating cost of the system and the resulting pollutant emissions are less than the diesel generator (DG) set. Therefore, it is worthwhile to use BESS instead of DG as the backup power source in RIES.

scholarly journals Operation Optimization of Integrated Energy System under a Renewable Energy Dominated Future Scene Considering Both Independence and Benefit: A Review

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1103
Author(s):  
Jiajia Li ◽  
Jinfu Liu ◽  
Peigang Yan ◽  
Xingshuo Li ◽  
Guowen Zhou ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Renewable Resources ◽  
Energy Systems ◽  
Energy System ◽  
High Ratio ◽  
Grid Security ◽  
Operation Optimization ◽  
Integrated Energy Systems ◽  
Energy Flows ◽  
Integrated Energy System

An integrated energy system interconnects multiple energies and presents a potential for economics improvement and energy sustainability, which has attracted extensive attention. However, due to the obvious volatility of energy demands, most existing integrated energy systems cannot operate in a totally self-sufficient way but interact with the upper grid frequently. With the increasingly urgent demand for energy saving and emissions reduction, renewable resources have occupied a larger and larger proportion in energy system, and at last they may be dominant in the future. Unlike conventional fossil fuel generation, the renewable resources are less controllable and flexible. To ease the pressure and guarantee the upper grid security, a more independent integrated energy system is required. Driven by that, this paper firstly reviews the optimal strategies considering both independence and benefit from perspectives of individual efforts and union efforts. Firstly, the general optimization process is summarized in terms of energy flows modelling and optimization methods to coordinate supply–demand side and realize benefit maximization. Based on that, handling with uncertainty of high-ratio renewable energy is reviewed from uncertainty modeling methods and multi-stage operation strategy perspectives to make the strategy accurate and reduce the adverse effects on the upper grid. Then, the hybrid timescale characteristics of different energy flows are explored to enhance operation flexibility of integrated energy systems. At last, the coordination among different participants is reviewed to reduce the whole adverse effect as a union. Remarks are conducted in the end of each part and further concluded in the final part. Overall, this study summarizes the research directions in operation optimization of integrated energy systems to cater for a renewable energy dominated scene to inspire the latter research.

scholarly journals Optimization of integrated energy system for combined cooling, heating and power supply of new energy based on energy storage

2021 ◽  
Vol 2121 (1) ◽  
pp. 012015
Author(s):  
Tieyan Zhang ◽  
Junbao Yang ◽  
Yaru Wang ◽  
Min Li ◽  
Dawei Zhang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Power Supply ◽  
Energy Systems ◽  
System Optimization ◽  
Energy System ◽  
Optimal Operation ◽  
Integrated Energy Systems ◽  
New Energy ◽  
Integrated Energy System ◽  
Combined Cooling

Abstract With the development of science and technology, people also pay more and more attention to the development of new energy. Although there are also many studies on integrated energy systems now, integrated energy systems containing energy storage should also be further studied. This paper proposes an optimization of integrated energy system for combined cooling, heating and power supply of new energy based on energy storage, which analyzes the gas turbine, absorption refrigerating machine, electric refrigerator, photovoltaic power generation units, wind turbine and the work characteristics of the energy storage device. In this paper, an integrated energy system optimization model of new energy cogeneration with energy storage equipment is established. An example shows that the integrated energy system with energy storage can effectively solve the independent decoupling operation relationship among cool, heat and electricity. At the same time, the proposed model can also solve the energy interaction among cool, heat and electricity. In this way, the optimal operation of the integrated energy system can be realized.

scholarly journals Integrated Energy Multi-Objective Operation Optimization

2020 ◽  
Vol 185 ◽  
pp. 01067
Author(s):  
Zhao Liu ◽  
Mengjin Hu ◽  
Xianlong Zhao ◽  
Yongli Wang ◽  
Suhang Yao ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Energy Consumption ◽  
Energy Flow ◽  
Energy System ◽  
Demand Side ◽  
Renewable Energy Consumption ◽  
Operation Optimization ◽  
Integrated Energy System ◽  
System Energy ◽  
Demand Side Response

The Integrated Energy System (IES) offers a new approach to the energy dilemma. It introduces demand-side response into the Regional Integrated Energy System (RIES) and proposes an operational optimization model considering Integrated Demand Side Response (IDSR) in the framework of RIES. First of all, the typical cold\thermal\electric RIES is used as a framework to establish the multi-energy flow model of RIES based on the energy flow relationships among energy production, conversion and consumption. Then, from the perspective of energy transfer, the potential to enhance renewable energy consumption by carrying out RIES to transfer the system energy flow is analyzed. Finally, the RIES operation optimization model considering IDSR is established with the goal of the economy of system operation, considering the system energy balance and the operating constraints of each energy device, and the solution algorithm is designed. Taking the RIES in a certain region as an example, the proposed method and model were verified computationally, and the results showed that IDR can effectively improve system economics and increase the level of renewable energy consumption.

scholarly journals Improved Thermoeconomic Energy Efficiency Analysis for Integrated Energy Systems

Processes ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 137
Author(s):  
Sha Liu ◽  
Jiong Shen
Keyword(s):  
Energy Efficiency ◽  
Energy System ◽  
Energy Conversion Efficiency ◽  
Integrated Analysis ◽  
Thermal Cycles ◽  
Irreversible Loss ◽  
Integrated Energy Systems ◽  
New Information ◽  
Integrated Energy System ◽  
Combined Cooling

The structure of an integrated energy system is complex. Thermoeconomics can play a significant role in the analysis of IES because it makes up for the deficiency of traditional thermodynamic analysis and provides new information on the cost and energy conversion efficiency. When using thermoeconomics to analyze the energy efficiency of an IES, one key issue that needs to be solved is how to transfer irreversible loss across thermal cycles, so that the mechanism of system performance degradation can be fully revealed. To this end, an irreversible cost and exergy cost integrated analysis method based on improved thermoeconomics is proposed, in which the cumulative and transmission impact of irreversible loss across thermal cycles is evaluated using linear transformation of <KP> matrix. A case study on a 389MW combined cooling, heating, and power IES demonstrates the effectiveness of the proposed approach. The proposed approach can reveal the key links impairing the overall energy efficiency and transfer of irreversible loss across thermal cycles. The approach can be extended to various types of IES to provide directions for the assessment and optimization of the system.

scholarly journals An integrated multi-energy flow calculation method for electricity-gas-thermal integrated energy systems

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Mengting Zhu ◽  
Chengsi Xu ◽  
Shufeng Dong ◽  
Kunjie Tang ◽  
Chenghong Gu
Keyword(s):  
Calculation Method ◽  
Energy Flow ◽  
Energy System ◽  
Calculation Model ◽  
Flow Calculation ◽  
Gas Network ◽  
Integrated Energy Systems ◽  
Unit Value ◽  
Integrated Energy System ◽  
Simplified Calculation

AbstractThe modeling and multi-energy flow calculation of an integrated energy system (IES) are the bases of its operation and planning. This paper establishes the models of various energy sub-systems and the coupling equipment for an electricity-gas-thermal IES, and an integrated multi-energy flow calculation model of the IES is constructed. A simplified calculation method for the compressor model in a natural gas network, one which is not included in a loop and works in constant compression ratio mode, is also proposed based on the concept of model reduction. In addition, a numerical conversion method for dealing with the conflict between nominal value and per unit value in the multi-energy flow calculation of IES is described. A case study is given to verify the correctness and speed of the proposed method, and the electricity-gas-thermal coupling interaction characteristics among sub-systems are studied.

scholarly journals Optimal Operation Strategy of a Community Integrated Energy System Constrained by the Seasonal Balance of Ground Source Heat Pumps

2020 ◽  
Vol 12 (11) ◽  
pp. 4627
Author(s):  
Jianan Liu ◽  
Hao Yu ◽  
Haoran Ji ◽  
Kunpeng Zhao ◽  
Chaoxian Lv ◽  
...  
Keyword(s):  
High Efficiency ◽  
Energy System ◽  
Heat Pumps ◽  
Optimal Operation ◽  
Coefficient Of Performance ◽  
Operation Strategy ◽  
Ground Source Heat Pumps ◽  
Integrated Energy Systems ◽  
Ground Source ◽  
Integrated Energy System

Ground source heat pumps (GSHPs) are now widely used in community integrated energy systems (CIES) because of their high efficiency in energy conversion. However, the coefficient of performance (COP) of GSHPs is unstable if the soil temperature changes with seasonal imbalanced cooling and heating loads, thus downgrading the overall performance of CIES. In this paper, an annual optimization model for CIES that considers the seasonal balance of GSHPs is established. Then, a day-ahead operation strategy based on the pre-allocated load of the GSHP in the yearly balance is proposed while considering the uncertainties in daily conditions. The proposed strategy is validated on a practical CIES in China and assessed on a year-round time scale. The results show that the operation of CIES can be stable, economical and sustainable while ensuring the seasonal balance of the GSHP.

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