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2017 IEEE 6th International Conference on Renewable Energy Research and Applications (ICRERA)最新文献

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Heat and mass transfer in a direct contact humidifier of a humidification-dehumidification desalination system 加湿-除湿海水淡化系统中直接接触式加湿器的传热传质
Alejandro Morales, D. Carvajal
A thermodynamic analysis of a direct contact humidifier in a Humidification-Dehumidification desalination system is presented. Applying mass and energy balances along the humidifier, a mathematical model was developed and a parametric study was carried out to study the effects of the inlet Temperature and mass flow rate of the seawater and air on the system performance. According to the obtained results, as the air mass flow rate increases, so the evaporation rate of the system does to a limit determined by the transversal area of the humidifier. In addition, increasing the sea water mass flow rate favors evaporation process because the temperature differences between the fluids gets bigger, however, increasing air mass flow represents a disadvantage in the energy consumption of the unit, so this is an important design parameter.
对加湿-除湿海水淡化系统中的直接接触式加湿器进行了热力学分析。利用加湿器的质量和能量平衡,建立了加湿器的数学模型,并进行了参数化研究,研究了海水和空气的入口温度和质量流量对系统性能的影响。根据所得到的结果,随着空气质量流量的增加,系统的蒸发速率会达到由加湿器横截面积决定的极限。另外,海水质量流量的增加有利于蒸发过程,因为流体之间的温差变大,而空气质量流量的增加对机组的能耗不利,因此这是一个重要的设计参数。
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引用次数: 4
Improvement of the performance of solar water heater based on nanotechnology 基于纳米技术的太阳能热水器性能改进
V. Msomi, O. Nemraoui
This paper reports on the performance improvement of the solar water heater (SWH) system through the incorporation of transparent nanomaterial called Fluorine doped Tin Oxide (FTO). Two identical solar water heaters were developed in order to study their performance. One system used normal glass while the other one used special glass. Thermocouples were installed in the inlet and the outlet for each system. The two thermocouples were to record the water temperature before entering the system and the water temperature leaving the system. The temperature data for the two systems are comparatively studied. It was discovered that the system with special glass produce water with higher temperature than the system with normal glass. This suggests That the incorporation of special glass allows more heat to be gained by the system.
本文报道了通过引入透明纳米材料氟掺杂氧化锡(FTO)来改善太阳能热水器(SWH)系统的性能。为了研究其性能,研制了两台相同的太阳能热水器。一个系统使用普通玻璃,而另一个系统使用特殊玻璃。热电偶安装在每个系统的入口和出口。两个热电偶记录进入系统前的水温和离开系统的水温。对两种体系的温度数据进行了比较研究。研究发现,使用特殊玻璃的系统比使用普通玻璃的系统产生更高温度的水。这表明,特殊玻璃的掺入允许系统获得更多的热量。
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引用次数: 12
Optimum location for operation of small size distributed generators 小型分布式发电机的最佳运行位置
N. Ghanbari, H. Golzari, H. Mokhtari, M. Poshtan
Optimizing the size and finding the best location of required number of micro gas turbine running Distributed Generators (DG) to minimize the active power losses is the focus of this paper. Since the excitation field of the synchronous machines discussed in this paper is produced by permanent magnets, the reactive power is not controlled. To minimize the active power losses and satisfy the demand load, a two-stage approach has been proposed for the allocation and sizing of DGs in a distribution system with time-varying loads. The strategic placement of DGs can help to reduce energy losses and maintain the voltage within an acceptable boundary. The proposed method has been tested on a 9-bus test system.
优化运行分布式发电机的微型燃气轮机的尺寸和最佳位置,使有功损耗最小化是本文研究的重点。由于本文所讨论的同步电机的励磁场是由永磁体产生的,所以无功功率不受控制。为使有功功率损耗最小并满足需求负荷,提出了一种时变负荷配电系统中分布式配电系统的两阶段分配和规模确定方法。dg的战略布局可以帮助减少能量损失并将电压保持在可接受的范围内。该方法已在一个9总线测试系统上进行了测试。
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引用次数: 14
Interpolation of intra-hourly electricity consumption and production data 每小时内电力消耗和生产数据的插值
Alo Allik, A. Annuk
This paper explores the problems of the averaging and interpolation of electricity consumption and distributed photovoltaic energy generation data on higher than hour resolution levels. The paper compares different interpolation methods, like linear and spline interpolation and discusses modelling approaches for the energy data reconstruction on the basis of minutely and hourly data. The results are compared by analyzing ramp rates, residuals and self-consumption values of the generated datasets, to find the deviation between modeled and measured high resolution data. As a practical result correction factors were proposed to reevaluate self-consumption calculations made with aggregated input data.
本文探讨了高小时分辨率水平下的电力消耗和分布式光伏发电数据的平均和插值问题。本文比较了不同的插值方法,如线性插值和样条插值,并讨论了基于分钟和小时数据的能量数据重建的建模方法。通过分析生成的数据集的斜坡率、残差和自消耗值,对结果进行比较,找出模型与实际高分辨率数据之间的偏差。作为一个实际结果,提出了修正因子来重新评估汇总输入数据的自我消耗计算。
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引用次数: 9
Solar irradiance forecasting using deep recurrent neural networks 利用深度递归神经网络预测太阳辐照度
Ahmad Alzahrani, P. Shamsi, M. Ferdowsi, C. Dagli
Solar irradiance prediction has a significant impact on various aspects of power system generation. The predictive models can be deployed to improve the planning and operation of renewable systems and can improve the power purchase process and bring several advantages to the power utilities. The irradiance is affected by several factors, such as clouds and dust, and it becomes challenging for physical models to predict and capture the dynamics. The statistical methods are commonly used to predict the irradiance. These methods include autoregressive moving average, support vector machine, and artificial neural network. Deficiencies and challenges of existing methods include low prediction accuracy, low scalability for big data, and inability to capture long-term dependencies. In this paper, a deep recurrent neural network is used to predict the solar irradiance. Deep recurrent neural network (DRNN) is an artificial neural network with more hidden layers to improve the complexity of the model and enable the extraction of high-level features. The neural network is trained, tested, and validated using real data from the National Resources in Canada. The simulation and experimental results are compared to other methods to illustrate the advantages using the proposed approach.
太阳辐照度预测对电力系统发电的各个方面都有重要的影响。该预测模型可用于改进可再生能源系统的规划和运行,并可改善购电过程,为电力公司带来诸多优势。辐照度受多种因素的影响,如云和尘埃,这对物理模型预测和捕获动力学变得具有挑战性。通常使用统计方法来预测辐照度。这些方法包括自回归移动平均、支持向量机和人工神经网络。现有方法的不足和挑战包括预测精度低、大数据可扩展性低、无法捕获长期依赖关系。本文采用深度递归神经网络对太阳辐照度进行预测。深度递归神经网络(Deep recurrent neural network, DRNN)是一种具有更多隐藏层的人工神经网络,其目的是提高模型的复杂性并能够提取高级特征。神经网络使用来自加拿大国家资源的真实数据进行训练、测试和验证。仿真和实验结果与其他方法进行了比较,说明了该方法的优越性。
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引用次数: 32
A predictive evaluation of global solar radiation using recurrent neural models and weather data 利用循环神经模型和天气资料对全球太阳辐射的预测评估
Rami Al-Hajj, A. Assi, Mohamad M. Fouad
This paper presents predictive models based on dynamic recurrent neural networks DRNNs with short term delay units to predict daily solar radiation intensity. The proposed approach aims to evaluate the daily global solar radiation using simple recurrent neural networks (SRNNs) with meteorological data. First, we present a reference model based on a feed-forward multilayer perceptron (MLP), then we present several recurrent models of the same structure but with various number of delay units that memorize the outcomes of the recurrent model to be used in subsequent iterations. The obtained comparative results showed advantage of DRNNs over simple MLPs when we deal with time series meteorological records. The performance of the proposed approach has been evaluated using statistical analysis.
本文提出了一种基于动态递归神经网络(DRNNs)的短期延迟单元预测太阳日辐射强度的模型。提出的方法旨在利用简单递归神经网络(SRNNs)和气象数据来评估每日全球太阳辐射。首先,我们提出了一个基于前馈多层感知器(MLP)的参考模型,然后我们提出了几个具有相同结构但具有不同数量延迟单元的循环模型,这些延迟单元可以记住循环模型的结果,以便在随后的迭代中使用。得到的对比结果表明,在处理时间序列气象记录时,DRNNs优于简单mlp。使用统计分析对所提出的方法的性能进行了评估。
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引用次数: 11
An integrated maintenance strategy for a power generation system under failure rate variation (case of wind turbine) 故障率变化下发电系统的集成维护策略(以风力发电机组为例)
Z. Hajej, N. Rezg, Maryem Bouzoubaa
In this work, we treat a simultaneously integrated maintenance optimization problem for a power generation system by studying the case of wind turbine. The generation system composed by a wind turbine system in order to satisfy a randomly power demand under a given service level and during a finite horizon. The goal of this work is to develop a jointly energy production and maintenance strategy optimization for the wind turbine production system. An economical energy production plan and an optimal maintenance strategy are determined in order to minimize the total cost of production, holding and maintenance by establishing a relationship between the energy production rates and the deterioration degree of the wind turbine. The key of this work is to reflect the impact of the variation of the energy production rates on the failure rate of the wind turbine. A numerical illustration is presented in order to apply the developed approach.
本文以风力发电机组为例,研究了发电系统的同步集成维修优化问题。在给定的服务水平和有限的水平下,为满足随机的电力需求,由风力发电系统组成的发电系统。本工作的目标是为风力发电机组生产系统制定联合能源生产和维护策略优化。通过建立发电量与风力机劣化程度之间的关系,确定经济的能源生产计划和最优的维护策略,以使生产、持有和维护的总成本最小。这项工作的关键是反映发电量的变化对风力机故障率的影响。为了应用所开发的方法,给出了一个数值说明。
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引用次数: 8
A dispatch method of combined heat and power plants with heat storage facilities for wind power accommodation 一种带蓄热设施的热电联产风电机组调度方法
Huan Ma, Qun Chen, K. Hu, Yuanhang Dai, Lei Chen, Fei Xu, Y. Min
An effective way to solve the problem of wind power curtailment is to install heat storage (HS) facilities in CHP plants. However, the existing power grid does not have the ability to schedule the heat storage facilities. In this paper, we have developed the combined heat and power dispatching system to schedule the power plants as well as the heat storage facilities for the maximum effect of wind power accommodation. The results show that cooperating with the existing scheduling system, the combined heat and power dispatching system has fine-tuned the initial schedules with the adjustment of the heat storage facilities to achieve the desired effect of improving the wind power consumption. Meanwhile, the maximum heat storage amount of the HS facility that limits the capacity of increasing wind power accommodation. What's more, the capacity can be affected when the heat load varies seasonally owing to the external characteristics of the CHP unit.
解决风电弃风问题的有效途径是在热电联产电厂安装蓄热设备。然而,现有的电网没有能力安排储热设施。在本文中,我们开发了热电联产调度系统,以调度发电厂和蓄热设施,以最大限度地发挥风电调节的作用。结果表明,热电联产调度系统配合现有调度系统,通过蓄热设施的调整对初始调度进行微调,达到了提高风电消纳的预期效果。同时,HS设施的最大蓄热量限制了风电容纳容量的增加。此外,由于热电联产机组的外部特性,当热负荷发生季节性变化时,还会影响热电联产机组的容量。
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引用次数: 4
Real time implementation of a single stage converter based solar-wind hybrid system 基于单级变换器的太阳风混合系统的实时实现
V. Rajini, W. M. Amutha
Increasing environmental pollutions, lack of power in remote places and demand for more energy makes us to seek new energy sources. Wind and solar hybrid energy have being popular ones owing to abundant, complement nature, ease of availability and convertibility to the electric energy. For hybridizing solar-wind system DC-AC or separate DC-DC converters are used one for each source. They will be connected to AD-DC or common DC-DC link to feed the loads according to the requirements. Such separate converters have the high count of elements and makes the system bulky and complex. This paper presents the performance comparison between separate cuk and buck converter and a single stage cuk-buck converter that integrates solar-wind renewable energy with battery backup using MATLAB/SIMULINK, to make best use of their operating characteristics and to achieve compactness and higher efficiency. FPGA controller is programmed for maintaining constant power at point of common coupling. An embedded controller based online state of charge estimation and battery charging system to suitably sink or source the input power based on the load demand is also carried out. Real time implementation of solar system with 1.5kW peak power, wind system with 1.4 kW and 48V, 200 Ah Lead-Acid batteries for powering 1200 Watts DC load is carried out to validate the theoretical approach.
日益严重的环境污染、偏远地区电力短缺以及对更多能源的需求促使我们寻求新能源。风能和太阳能混合能源因其丰富、互补、易于获得和可转换的特性而受到欢迎。对于混合太阳能-风系统,每个源使用DC-AC或单独的DC-DC转换器。它们将根据需要连接到AD-DC或普通DC-DC链路上馈电负载。这种独立的转换器具有很高的元件数量,使系统庞大而复杂。本文利用MATLAB/SIMULINK对分体式buck变换器和集成太阳能-风能可再生能源与备用电池的单级buck变换器进行了性能比较,以充分利用其工作特性,实现结构紧凑、效率高的目标。FPGA控制器被编程为在公共耦合点保持恒定功率。还设计了一种基于嵌入式控制器的在线充电状态估计和电池充电系统,以根据负载需求适当地吸收或来源输入功率。以峰值功率为1.5kW的太阳能系统、峰值功率为1.4 kW的风力系统、48V、200 Ah的铅酸蓄电池为1200瓦直流负载供电的实时实现为例,验证了理论方法。
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引用次数: 5
Study, modeling and simulation of the electrical characteristic of space satellite solar cells 空间卫星太阳能电池电特性的研究、建模与仿真
A. H. Dida, M. Bekhti
Currently, solar energy is the primary source of energy for space missions. The development of space systems is affected to many fields: the study of space itself, the science of materials and especially the field of energy. Indeed, solar panels are the only non-nuclear means that enable satellites in orbit to be fed continuously. The efficiency of these solar cells increases. Current triple junction solar cells reach 30% and the next generation will bring 35% in 5 years to peak at 40% In this research work, we had studied, modeled and simulated the electrical characteristics of the space satellite solar cells. Then, we had made a comparison between their efficiency to determine the best choice of solar cell which will bring the good performance to be used in the design of solar panel of our satellite. Finally, an experimental test bench was designed to study, measure and perform the electrical characterization of solar panel using the Arduino MEGA2560 board.
目前,太阳能是太空任务的主要能源。空间系统的发展影响到许多领域:空间本身的研究,材料科学,特别是能源领域。事实上,太阳能电池板是唯一的非核手段,可以使轨道上的卫星持续供电。这些太阳能电池的效率提高了。目前的三结太阳能电池达到30%,下一代将在5年内达到35%,达到40%的峰值。在本研究工作中,我们对空间卫星太阳能电池的电学特性进行了研究、建模和仿真。然后,我们对它们的效率进行了比较,以确定太阳能电池的最佳选择,从而将其良好的性能用于我们卫星太阳能电池板的设计。最后,设计了一个实验测试平台,利用Arduino MEGA2560板对太阳能电池板进行研究、测量和电学表征。
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引用次数: 13
期刊
2017 IEEE 6th International Conference on Renewable Energy Research and Applications (ICRERA)
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