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نتیجه جستجو - Hybrid system

تعداد مقالات یافته شده: 28
ردیف عنوان نوع
1 PV generator and energy storage systems for laboratory building
ژنراتور PV و سیستم های ذخیره انرژی برای آزمایشگاه-2020
A microgrid contains a PV generator and energy storage system connected in a laboratory building. Power generation is scheduled to meet the load of the building to adjust optimally the generation exchange within the microgrid. In this study, the problem of decreasing the cost of energy under varied system constraints and user decisions is addressed. In addition, minimizing electricity costs of the utility grid is proposed as an optimization model. To minimize the using of the grid, ESS is scheduled according to the peak demand. The proposed algorithm schedules the charging and discharging of the battery. A switching control technique is implemented for optimal scheduling of the hybrid system. Simulation is performed using GAMS, the obtained results validate that the intended model can minimize the operation cost.
Keywords: Day ahead | PV generation | Optimization | Multi objective scheduling | Energy management
مقاله انگلیسی
2 Energy management of hybrid electric vehicles: A review of energy optimization of fuel cell hybrid power system based on genetic algorithm
مدیریت انرژی وسایل نقلیه الکتریکی هیبریدی: مروری بر بهینه سازی انرژی سیستم قدرت هیبریدی سلول سوختی بر اساس الگوریتم ژنتیکی-2020
Under the background of current environmental pollution and serious shortage of fossil energy, the development of electric vehicles driven by clean new energy is the key to solve this problem, especially the hybrid electric vehicle driven by fuel cell is the most effective solution. Many scholars have found that the output performance of hybrid system is an important reason to determine the life of fuel cell. Unreasonable output will affect the control characteristics of the drive system, resulting in a series of serious consequences such as the reduction of the life of fuel cell hybrid power system. Therefore, the energy management strategy and performance optimization of hybrid system is the key to ensure the normal operation of the system. At present, many excellent researchers have carried out relevant research in this field. Genetic algorithm is a heuristic algorithm, which has better optimization performance. It can easily choose satisfactory solutions according to the optimization objectives, and make up for these shortcomings by using its own characteristics. These characteristics make genetic algorithm have outstanding advantages in the iterative optimization of energy management strategy. This paper analyzes and summarizes the optimization effect of genetic algorithm in various energy management strategies, aiming to analyze and select the optimization rules and parameters, optimization objects and optimization objectives. This paper hopes to provide guidance for the optimal control strategy and structural design of the fuel cell hybrid power system, contribute to the research on improving the energy utilization efficiency of the hybrid power system and extending the life of the fuel cell, and provide more ideas for the optimization of energy management in the future.
Keywords: Fuel cell hybrid electric vehicle | Energy management strategy | Hybrid power system | Genetic algorithm |Optimization parameters and objectives
مقاله انگلیسی
3 Steering control law for double-gimbal scissored-pair CMG
قانون کنترل فرمان دو حلقه قیچی جفت CMG-2020
Because control moment gyroscopes (CMGs) can generate a large torque compared to reaction wheels, they are used as actuators for attitude control of large spacecraft. However, when the number of Single-Gimbal CMG (SGCMG) units is five or less, there can be internal singularities that cannot generate torque around the desired direction. To construct a system that has no internal singularities, six or more SGCMGs are required, because an orthogonally arrayed, three scissored-pair CMG system has no internal singularities. Because CMG singularities are disruptive for attitude control, a great deal of effort has been devoted to overcoming the CMG singularity problem; the various designs include Variable-Speed CMGs (VSCMGs), Double-Gimbal CMGs (DGCMGs), and Double-Gimbal Variable- Speed CMGs (DGVSCMGs). However, these designs still have problems, such as a slow response to torque generation commands about the wheel axis in VSCMGs and DGVSCMGs, and difficulty in precise attitude tracking when perturbation torque is generated to avoid singularities. To overcome the problems of the traditional CMG configurations, this paper proposes a new CMG system configuration that we call the Double-Gimbal Scissored-pair CMG (DGSPCMG) system. Because the DGSPCMG system is a hybrid system combining a Scissored-Pair CMG and a DGCMG, the DGSPCMG system does not have internal singularities except at the origin and along the x-axis. Moreover, this system can recover from an internal singularity by null motion only, and from outer singularities (saturation singularities) by steering the scissored-pair gimbals only. Thus, generation of perturbation torque is unnecessary for recovering from singularities, and a precise attitude tracking maneuver can be more easily achieved. This paper presents a conceptual design of a DGSPCMG system and describes a steering control law for the proposed system. Furthermore, the validity of the proposed steering control law is demonstrated through numerical simulations and results of comparison experiments are shown to demonstrate the advantage of the DGSPCMG over a VSCMG.
Keywords: Scissored-pair CMG | Double gimbal CMG | Steering control law | Singularities
مقاله انگلیسی
4 Nonlinear control and optimization of hybrid electrical vehicle under sources limitation constraints
کنترل غیرخطی و بهینه سازی وسیله نقلیه الکتریکی هیبریدی تحت محدودیت منابع-2020
This work presents a new contribution on energy management of hybrid electric systems for vehicle applications. The studied hybrid electrical vehicle is composed of fuel cell as a main source and the auxiliary system containing the battery and supercapacitor. A programmable load is used to emulate a vehicle load profile. Two methods are combined to smartly and optimally control the energy flow between the used sources. These methods are the Interconnection and Damping Assignment Passivity Based Control (IDA-PBC) and the Hamilton-Jacobi Bellman (HJB) optimization. The source limitation is considered here in terms of the battery state of charge. The experimental works validate the efficiency of the proposed control where the obtained results demonstrate that the used strategy allows regulating the power flow under a realistic load drive profile. The global stability proof is demonstrated using Lyapunov theory.
Keywords: Energy management | Hybrid system | Passivity based control | Constraints | Hamilton-Jacobi Bellman method
مقاله انگلیسی
5 Performance assessment of a hybrid solid oxide and molten carbonate fuel cell system with compressed air energy storage under different power demands
ارزیابی عملکرد سیستم اکسید جامد ترکیبی و سیستم سلولی سوخت کربنات مذاب با ذخیره انرژی هوای فشرده تحت تقاضای توان مختلف-2020
As electricity demand can vary considerably and unpredictably, it is necessary to integrate energy storage with power generation systems. This study investigates a solid oxide and molten carbonate fuel cell system integrated with a gas turbine (GT) for power generation. The advanced adiabatic compressed air energy storage (AA-CAES) system is designed to enhance the system flexibility. Simulations of the proposed power system are performed to demonstrate the amount of power that can supply to the loads during normal and peak modes of operation under steady-state conditions. The pressure ratios of the GT and AACAES and the additional air feed are used to design the system and analyze the system performance. The results show that a small additional air feed to the GT is certainly required for the hybrid system. The GT pressure ratio of 2 provides a maximum benefit. The AA-CAES pressure ratio of 5 is recommended to spare some air in the storage and minimize storage volume. Moreover, implementation of the GT and AA-CAES into the integrated fuel cell system allows the system to cope with the variations in power demand.
Keywords: Solid oxide fuel cell | Molten carbonate fuel cell | Gas turbine | Compressed air energy storage | Energy management system
مقاله انگلیسی
6 Hybrid energy management with respect to a hydrogen energy system and demand response
مدیریت انرژی ترکیبی با توجه به سیستم انرژی هیدروژن و پاسخ به تقاضا-2020
A Hybrid Energy System (HES) is a mechanism that combines multiple sources of energy connected together to achieve synchronised energy output. However, increased energy consumption, operator energy expenses, and the potential environmental impact of increased emissions from the exhaustion of non-renewable energy resources (fossil fuel) pose major challenges to HES. This research is to conduct energy management strategy based on a demand response (DR) program and a hydrogen storage system by designing a Program Logic Controller (PLC) unit. The hybrid system is evaluated by comparing different scenarios such as a hydrogen energy system and demand response. The purpose of this research is to reducing peak demand, minimise the cost of the system and also to extract surplus power generation out of the rate of the battery. This can be achieved by improving the system performances and by eliminating any degradation at the early stages. Organisations or companies must be sure their systems are working properly and that their investments will pay off.
Keywords: Energy management | Hybrid energy | Hydrogen energy | PLC and demand response
مقاله انگلیسی
7 Development of solid oxide fuel cell and battery hybrid power generation system
توسعه سلول سوخت جامد اکسید و سیستم تولید برق ترکیبی باتری-2020
Solid oxide fuel cell hybrid generation system is the best scheme for the load tracking of off-grid monitoring stations. But there are still potential problems that need to be addressed: preventing fuel starvation and ensuring thermal safety while meeting load tracking in hybrid power generation system. In order to solve these problems, a feasible hybrid power generation system structure scheme is proposed which combined SOFC subsystem and Li-ion battery subsystem. Then a model of the hybrid power generation system is built based on the proposed system structure. On this basis, an adaptive controller, include the adaptive energy management algorithm and current feedforward gas supply strategy, is applied to manage the power-sharing in this hybrid system as well as keep the system operating within the safety constraints. The constraints, including maintaining the bus voltage at the desired level, keeping SOFC operating temperature in safety, and mitigating fuel starvation are explicitly considered. The stability of the proposed energy management algorithm is analyzed. Finally, the developed control algorithm is applied to the hybrid power generation system model, the operation result proves the feasibility of the designed controller strategy for hybrid generation system and effectively prevent fuel starvation and ensure thermal safety.
Keywords: Solid oxide fuel cells | Hybrid system | Adaptive control | Energy management
مقاله انگلیسی
8 Energy management and control strategy for a DFIG wind turbine/fuel cell hybrid system with super capacitor storage system
مدیریت و استراتژی کنترل انرژی برای یک سیستم ترکیبی توربین بادی و سوختی DFIG با سیستم ذخیره سازی فوق العاده خازن-2020
This paper deals with a modeling and control of a hybrid power system based on fuel cell and wind turbine (WT) system based a Doubly Fed Induction Generator (DFIG). To improve the performance of the hybrid energy system, a super-capacitor storage system is associated with a fuel cell which is not able to compensate the fast variation of the load power demand. In this case, rule based energy management algorithm should be applied to share energy between three source elements in order to satisfy load power demand. The main originality of this work lies in the new topology of theWT-DFIG/Full cell/super capacitor hybrid power system which presents an easier accessibility of DC and AC grid. For the wind energy conversion system, the proposed control is the Maximum Power Point Tracking algorithm based a torque control loop (OTC). The wind turbine is equipped with a DFIG operated at variable speed which the control is based on direct power control. Simulation results show the effectiveness of the proposed control strategy and the energy management algorithm. A dSpace 1104 real-time board is used for management algorithm implementation. The obtained experimental results prove the efficiency of the proposed control strategy.
Keywords: Hybrid system | Fuel cell | Wind turbine | Super capacitor storage system | Direct power control | Energy management
مقاله انگلیسی
9 Optimized energy management strategy for grid connected double storage (pumped storage-battery) system powered by renewable energy resources
استراتژی مدیریت انرژی بهینه سازی شده برای سیستم ذخیره دوگانه متصل به شبکه (پمپ باتری ذخیره شده) که از منابع انرژی تجدید پذیر استفاده می شود-2020
This paper presents a grid-connected double storage system (DSS) consisting of pumped-storage hydropower (PSH) and battery. The system is supplied by photovoltaics and wind turbines. In the proposed hybrid system, batteries absorb excess renewable energy that cannot be stored in PSH and they cover loads that cannot be supplied from the water turbine. To improve the system performance, a novel energy management strategy for the DSS is proposed. The strategy is based on an optimized factor that governs the charging process of the DSS. The problem of the optimal system design is solved by a nondominated sorting genetic algorithm (NSGA-II). The multi-objective function considers simultaneously the minimal investment cost and minimal CO2 emissions. A comparative study of photovoltaic/wind/ pumped-storage hydropower and photovoltaic/wind/double storage system is performed to show the effectiveness of the proposed strategy in terms of system economic and environmental performance. The considered location of the PSH station is on Attaqa Mountain at Suez (Egypt). The results indicate the effectiveness of the proposed energy management strategy for the storage system from economic and environmental perspectives. Coupling the battery with the PSH reduces the electricity cost by 22.2% and results in minimal energy exchange with the national grid (5% of the annual demand). A sensitivity analysis shows the largest variation of the electricity cost with changing the capital cost of the solar and wind generators. Also, it is observed that when the load increases, the optimal size of the system components increases, but it isn’t proportional with the demand increase as could be expected.
Keywords: Pumped-storage hydropower | Battery | Double storage system | Renewable energy sources | NSGA-II | Hybrid energy system
مقاله انگلیسی
10 A cascaded energy management optimization method of multimode power-split hybrid electric vehicles
یک روش بهینه سازی مدیریت انرژی آبشار از وسایل نقلیه برقی هیبریدی تقسیم قدرت چند حالته-2020
A novel multimode power-split hybrid electric vehicle demonstrates significant advantages in energy conservation. The complicated structure and multiple operation modes, however, have brought significant challenges to energy management. The problems of operation mode selection, power allocation, and operating point selection need to be solved simultaneously. Traditionally, existing energy management strategies first have determined operation mode and then have solved power allocation and operating points. Moreover, traditional dynamic programming usually has not considered electric energy consumption and has deviated from the optimal solution. To solve these problems, a cascaded energy management strategy that integrates dynamic programming and equivalent consumption minimization strategy (DP þ ECMS) is proposed. An iterative method is used to optimize the equivalence factor. A vehicle model based on actual control strategy is established and validated by test results. Then fuel economy simulations are conducted. Results showed that DP þ ECMS could achieve 19.9% fuel economy improvement compared with the rule-based strategy for a new European driving cycle. In addition, simulation results of a Worldwide Harmonized Light-Duty Test Cycle demonstrated that DP þ ECMS performed well in real road driving conditions. This study introduces a novel multimode power-split hybrid system and provides a global energy management optimization method.
Keywords: Hybrid electric vehicle | Power-split hybrid system | Energy management | Dynamic programming
مقاله انگلیسی
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