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《International Journal of Hydrogen Energy》2020,45(27):13862-13875
Hydrogen has been a promising energy carrier to meet the world's energy needs as well as reduce pollutant emissions. Although many countries have policies and programs to expand hydrogen production, the potential for hydrogen production in different regions of Qatar has not yet been evaluated. Therefore, this paper, for the first time, evaluates the possibility of an average annual cogeneration of 14 kWh of electricity and 85 kg/day of hydrogen by a home-scale solar-wind system connected to the grid in Qatar. NASA's 20-year average of meteorological data, the electricity tariff and gasoline price in 2018, along with annual real interest rate, were used as inputs to HOMER software. The techno-econo-enviro analysis was done over a one-year period hour by hour. From the results, it was found that the lowest prices of hydrogen and electricity generated, with $ 2.092/kg and $ 11.495/kWh, were related to Grid and PV-Wind-Grid scenarios, respectively. Also, results indicated that Ar-Ruways station and PV-Wind-Grid scenario were the most environmentally suitable options that resulted in a CO2 emission rate of 1434 kg annually. To select just one station among five areas, a fuzzy method was deployed as a prioritization technique. Its results suggested that Doha Intl Airport site is the most suitable one for constructing solar-wind hybrid energy generation system. 相似文献
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基于核函数极限学习机的微电网短期负荷预测方法 总被引:6,自引:0,他引:6
针对以单个或集体用户为业主的用户侧小容量微电网,考虑到成本约束及用电特征的不确定性,提出了一种基于核函数极限学习机的微电网短期负荷预测方法。使用核函数极限学习机、启发式遗传算法和分时训练样本,建立了包含离线参数寻优与在线负荷预测的预测模型;通过模型参数的周期更新来保证算法最优参数的时效性,同时降低在线预测系统的计算复杂度与历史数据存储量。通过对不同容量、类型的用户侧微电网进行短期负荷预测,分析了预测结果的准确度、参数周期更新的效果、预测结果对经济运行的影响和预测方法的计算效率。 相似文献
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If electric power is supplied using an independent micro-grid connected to renewable energy, it can flexibly match the energy demand characteristics of a local area. And an independent micro-grid is expected to be effective in cutting greenhouse gas discharge and energy costs, as well as in eliminating the need for an emergency power supply system. Since the output of renewable energy is unstable, other energy equipment needs to cover the stability of output. Thus, the operating conditions of an independent micro-grid that supplies power with natural power sources and fuel cells are investigated. The operation conditions of a fuel-cell independent micro-grid with wind power generation were investigated by numerical analysis. Step loads and an apartment house power load model were analyzed using the dynamic characteristics of a fuel cell obtained from experiments. The output of wind power generation and fuel cells is controlled by proportional-integral control of an independent micro-grid for rapid power demand change. 相似文献
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《International Journal of Hydrogen Energy》2021,46(57):29706-29723
Mountain huts, as special, stand-alone, micro-grid systems, are not connected to a power grid and represent a burden on the environment. The micro-grid has to be flexible to cover daily and seasonal fluctuations. Heat and electricity are usually generated with fossil fuels due to the simple on-off operation. By introducing renewable energy sources (RESs), the generation of energy could be more sustainable, but the generation and consumption must be balanced. The paper describes the integration of a hydrogen-storage system (HSS) and a battery-storage system (BattS) in a mountain hut. The HSS involves a proton-exchange-membrane water electrolyser (PEMWE), a hydrogen storage tank (H2 tank), a PEM fuel cell (PEMFC) and a BattS consisting of lead-acid batteries. Eight micro-grid configurations were modelled using HOMER and evaluated from the technical, environmental and economic points of view. A life-cycle assessment analysis was made from the cradle to the gate. The micro-grid configurations with the HSS achieve, on average, a more than 70% decrease in the environmental impacts in comparison to the state of play at the beginning, but require a larger investment. Comparing the HSS with the BattS as a seasonal energy storage, the hydrogen-based technology had advantages for all of the assessed criteria. 相似文献
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针对光伏发电技术中太阳能池板的最大功率工作点展开研究,阐述了太阳能池板的发电原理及数学模型的建立.针对太阳能池板输出特性及最大功率跟踪的方法,对比分析了传统的恒定电压法、扰动观察法和电导增量法,总结优缺点后提出了改进型变步长电导增量法.在距离最大功率点较远的时候,采用较大的步长,缩减追踪时间,在最大功率点附近时,减小步长,增大追踪精度.利用Matlab仿真软件对传统和所提出的变步长电导增量法进行了仿真,仿真结果对比证明变步长增量法收敛速度快,效果良好.最后通过光伏发电并网试验系统进行了4.4 kW太阳能池板最大功率跟踪技术实验,跟踪实验误差为3%,符合微电网技术要求. 相似文献
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Multi-objective operation management of a renewable MG (micro-grid) with back-up micro-turbine/fuel cell/battery hybrid power source 总被引:2,自引:0,他引:2
As a result of today’s rapid socioeconomic growth and environmental concerns, higher service reliability, better power quality, increased energy efficiency and energy independency, exploring alternative energy resources, especially the renewable ones, has become the fields of interest for many modern societies. In this regard, MG (Micro-Grid) which is comprised of various alternative energy sources can serve as a basic tool to reach the desired objectives while distributing electricity more effectively, economically and securely. In this paper an expert multi-objective AMPSO (Adaptive Modified Particle Swarm Optimization algorithm) is presented for optimal operation of a typical MG with RESs (renewable energy sources) accompanied by a back-up Micro-Turbine/Fuel Cell/Battery hybrid power source to level the power mismatch or to store the surplus of energy when it’s needed. The problem is formulated as a nonlinear constraint multi-objective optimization problem to minimize the total operating cost and the net emission simultaneously. To improve the optimization process, a hybrid PSO algorithm based on a CLS (Chaotic Local Search) mechanism and a FSA (Fuzzy Self Adaptive) structure is utilized. The proposed algorithm is tested on a typical MG and its superior performance is compared to those from other evolutionary algorithms such as GA (Genetic Algorithm) and PSO (Particle Swarm Optimization). 相似文献
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随着城市负荷快速增长,供电可靠性要求不断提高,城市供给电能面临着越来越大的困难和挑战。柔性直流技术为城市构建高压电网和接入微电网提供了支持。柔性直流输电利用电压源换流器VSC的自换向特性运行,具有诸多优点。分析了当前城市配网面临问题和柔性直流输电原理及技术优势,从优越性、成本估计和微网接入等方面对柔性直流输电在城市电网中的应用进行了探讨。 相似文献
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