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本文研究带有风能随机供给的智能电网中传统能源的多周期买电问题,假设存在一个能源运营商集中负责智能电网传统能源的购买和消费。通过构建并求解动态规划模型,找到能源运营商在风能供给不确定性下的传统能源最优多周期买电策略。在最优买电策略下,能源运营商只有在当期电价足够小时才购买传统能源,其买电量与风能分布、价格信息和时间信息有关。在实际数据的基础之上,提供详实的数值实验对比研究了本文的最优买电策略和其他两种策略(实践中只考虑风能估计的策略和放弃利用风能的策略)在最小化总成本方面的效果,并验证了本文的最优买电策略在真实风能数据中的鲁棒性。 相似文献
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风速概率分布特性和风能概率密度特性研究是风电场风能资源评估的重点。本文使用混合威布尔模型进行风速和风能概率密度估计,从而研究风能资源分布特性。在本文中,混合分布的个数没有限制,通过AIC信息准则进行模型选择。结果与威布尔分布模型、正态分布模型和对数正态分布模型进行对比,通过计算Kolmogorov-Smirnov距离、判定系数和平方根误差评估模型的拟合效果。结果表明,混合威布尔分布模型与实际风速概率密度分布和风功率概率密度分布更加匹配,特别对于风功率密度概率密度来说。由此可见,用混合威布尔模型可以适用于较为复杂的风速与风功率密度分布状况,适合应用于风电场风能资源分布特性的研究以及区域风能资源的评估。 相似文献
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利用灰色系统理论分析方法,根据2010-2015年的发电量统计数据对我国可再生能源的发展态势进行研究.对包括水能、太阳能、风能、生物质能、海洋及地热能、核能等进行关联度分析.分析结果表明,这些因素中,核能及水能是可再生及非化石能源发电量的主要影响因素,生物质能是潜在的发展因素核能、水能及生物质能源的发电量都将呈现增长的趋势,太阳能则对可再生能源系统发电量影响力最小,在未来需加快发展. 相似文献
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《数学的实践与认识》2019,(20)
运用2018年全国研究生电工杯数学建模竞赛B题的数据资料,针对海南省主要城市商品住宅价格问题的第四问展开研究.在前三问中,首先通过搜集数据并对数据进行合理的处理,对海南省(主要考虑海口和三亚)商品住宅价格的影响因素进行定量分析,得出各因素之间的关系.问题四中,考虑限购政策,在综合分析房价影响因素的基础上,筛选新的指标,构建了基于改进粒子群算法模糊层次分析法——PSR模型的房地产调控政策对于房价影响的评价体系,得到了海南省的房地产宏观调控政策的对房价上涨的影响结果.最后,根据建立的评价体系利用matlab神经网络工具箱按月预测了2018年6月-2019年5月海南省(主要考虑海口和三亚)商品住宅价格. 相似文献
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柳叶 《数学的实践与认识》2018,(7)
针对大型风电场风能利用率低下的问题,从优化风机维护方案的角度出发,在假设风速服从瑞利分布的前提下,建立了两阶段多目标0-1规划模型,确定了所有风机每年2次的维护方案,方案以风电场风能利用率最大为目标,兼顾了维修人员的值班任务和维护任务的均衡,具有操作简单、可行性强的优势. 相似文献
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大型近海水平轴风力机转轮的空气动力学性能优化判据 总被引:1,自引:0,他引:1
以近海风能工程为研究目标,对具有不同特性参数(设计风速、叶尖线速度和转轮实度)的大容量(1~10 MW)风力机转轮的气动性能与几何特性进行分析与研究.首先提出大型机组转轮气动性能优化判据:在其直径最小的前提下具有尽可能高的年可用风能特性因数以及与之相关的风能利用系数,因而可捕获最多风能,使年发电量最大.接着给出影响它的几个主要气动参数,如转轮设计风速、叶尖线速度以及转轮实度,并分析风力机在近海气象条件下运转时上述两个气动指标随这些参数变化的规律.提供的气动分析方法及结果可作为大型近海风力机转轮气动性能的评价基础. 相似文献
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公共租赁房租金定价研究 总被引:7,自引:3,他引:4
公共租赁房租金的合理制定是我国保障性住房体系建立健全的又一核心问题.而当前我国公租房租金定价实践中出现的定价标准混乱、租金设置不合理现象严重制约了保障性住房体系的发展和城市住房困难居民居住条件的改善.针对这一难题,从福利经济学的研究视角出发,对公租房租金产生的根源进行了探究.首先利用经济学模型解释了公租房租金形成的机制,得出了合理租金价格制定的标准.然后结合基于GIS的反距离加权插值法(IDW)构建了公租房租金定价的区域成本综合定价模型,并以北京市为案例进行了公租房租金价格的实证测算及对比研究.最后,依据研究结论向住房和城乡建设部及地方各级住房和城乡建设委员会提出了相应的政策建议. 相似文献
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ZHENG ShiJun 《分析论及其应用》2004,20(3)
Schr(o)dinger operator is a central subject in the mathematical study of quantum mechanics.Consider the Schrodinger operator H = -△ V on R, where △ = d2/dx2 and the potential function V is real valued. In Fourier analysis, it is well-known that a square integrable function admits an expansion with exponentials as eigenfunctions of -△. A natural conjecture is that an L2 function admits a similar expansion in terms of "eigenfunctions" of H, a perturbation of the Laplacian (see [7], Ch. Ⅺ and the notes), under certain condition on V. 相似文献
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We study a class of self-similar processes with stationary increments belonging to higher order Wiener chaoses which are similar to Hermite processes. We obtain an almost sure wavelet-like expansion of these processes. This allows us to compute the pointwise and local Hölder regularity of sample paths and to analyse their behaviour at infinity. We also provide some results on the Hausdorff dimension of the range and graphs of multidimensional anisotropic self-similar processes with stationary increments defined by multiple Wiener–Itô integrals. 相似文献
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It is considered the class of Riemann surfaces with dimT1 = 0, where T1 is a subclass of exact harmonic forms which is one of the factors in the orthogonal decomposition of the spaceΩH of harmonic forms of the surface, namely The surfaces in the class OHD and the class of planar surfaces satisfy dimT1 = 0. A.Pfluger posed the question whether there might exist other surfaces outside those two classes. Here it is shown that in the case of finite genus g, we should look for a surface S with dimT1 = 0 among the surfaces of the form Sg\K , where Sg is a closed surface of genus g and K a compact set of positive harmonic measure with perfect components and very irregular boundary. 相似文献
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《高校应用数学学报(英文版)》2014,29(4)
正Applied Mathematics-A Journal of Chinese Universities,Series B(Appl.Math.J.Chinese Univ.,Ser.B)is a comprehensive applied mathematics journal jointly sponsored by Zhejiang University,China Society for Industrial and Applied Mathematics,and Springer-Verlag.It is a quarterly journal with 相似文献
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《数学研究及应用》2014,(6)
正Journal overview:Journal of Mathematical Research with Applications(JMRA),formerly Journal of Mathematical Research and Exposition(JMRE)created in 1981,one of the transactions of China Society for Industrial and Applied Mathematics,is a home for original research papers of the highest quality in all areas of mathematics with applications.The target audience comprises:pure and applied mathematicians,graduate students in broad fields of sciences and technology,scientists and engineers interested in mathematics. 相似文献
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A cumulative-capacitated transportation problem is studied. The supply nodes and demand nodes are each chains. Shipments from a supply node to a demand node are possible only if the pair lies in a sublattice, or equivalently, in a staircase disjoint union of rectangles, of the product of the two chains. There are (lattice) superadditive upper bounds on the cumulative flows in all leading subrectangles of each rectangle. It is shown that there is a greatest cumulative flow formed by the natural generalization of the South-West Corner Rule that respects cumulative-flow capacities; it has maximum reward when the rewards are (lattice) superadditive; it is integer if the supplies, demands and capacities are integer; and it can be calculated myopically in linear time. The result is specialized to earlier work of Hoeffding (1940), Fréchet (1951), Lorentz (1953), Hoffman (1963) and Barnes and Hoffman (1985). Applications are given to extreme constrained bivariate distributions, optimal distribution with limited one-way product substitution and, generalizing results of Derman and Klein (1958), optimal sales with age-dependent rewards and capacities.To our friend, Philip Wolfe, with admiration and affection, on the occasion of his 65th birthday.Research was supported respectively by the IBM T.J. Watson and IBM Almaden Research Centers and is a minor revision of the IBM Research Report [6]. 相似文献
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