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配电网光伏消纳能力定界模拟与消纳方案综合择优 被引量:22
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作者 薛蕾 井天军 +1 位作者 陈义 王维洲 《电网技术》 EI CSCD 北大核心 2020年第3期907-916,共10页
在分布光伏接入配电网的比例逐年递增的背景下,评估与优化配电网的光伏消纳能力具有重要意义。针对配电网高渗透率光伏的接入节点数量、接入位置和接入容量的三重不确定性规划难题,提出了基于随机场景模拟与定界划分评估的配电网光伏消... 在分布光伏接入配电网的比例逐年递增的背景下,评估与优化配电网的光伏消纳能力具有重要意义。针对配电网高渗透率光伏的接入节点数量、接入位置和接入容量的三重不确定性规划难题,提出了基于随机场景模拟与定界划分评估的配电网光伏消纳能力评估方法。首先以电压质量、变压器与线路传输容量为约束边界,对随机模拟场景的近似最大光伏消纳能力进行评估;然后分析了随机模拟场景分布性质,提出基于镜像埃尔朗抽样和场景分布性质的模拟效率的优化方法;最后通过多目标满意度距离从光伏消纳方案中比选出消纳容量、年运行电压安全裕度、配电网年均投资效益的综合最大的方案,保证配电网光伏的最大、安全和经济消纳。通过IEEE33节点系统的仿真分析,验证了所述方法的有效性及可行性。 展开更多
关键词 高渗透率光伏 配电网 消纳能力 随机模拟 定界评估
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On the Existence of Positive Solutions of Singular Second Order Boundary Value Problems 被引量:2
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作者 LIHe-cheng 《Chinese Quarterly Journal of Mathematics》 CSCD 2004年第1期101-106,共6页
This paper deals with the existence of positive solutions of the equation u'+f(t, u)=0 with linear boundary conditions. We show the existence of at least one positive solution if / is neither superlinear nor subli... This paper deals with the existence of positive solutions of the equation u'+f(t, u)=0 with linear boundary conditions. We show the existence of at least one positive solution if / is neither superlinear nor sublinear on u by a simple application of a fixed point Theorem in cones. 展开更多
关键词 boundary value problem positive soulution fixed point EXISTENCE
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Expanding the Definition and Measurement of Knowledge Economy: Integrating Triple Bottom Line Factors into Knowledge Economy Index Models and Methodologies 被引量:1
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作者 Denise A. D. Bedford 《Journal of Modern Accounting and Auditing》 2013年第2期278-286,共9页
The application of knowledge is a primary source of growth in the knowledge economy. The World Bank Group has developed a rigorous assessment methodology for assessing a country's ability to access and use knowledge ... The application of knowledge is a primary source of growth in the knowledge economy. The World Bank Group has developed a rigorous assessment methodology for assessing a country's ability to access and use knowledge to become more competitive in the knowledge economy of the 21st century. The World Bank's annual knowledge economy index is grounded on a four-pillar model: (1) economic incentives and institutional regime; (2) education and skills; (3) information and communication infrastructure; and (4) innovation systems. An argument can be made that the model lacks coverage of some key factors that pertain to intellectual capital and the production and consumption of knowledge. The model's heavy focus on economic incentives and open institutional regimes comes at a societal cost. This paper proposes an alternative knowledge economy index which is grounded in a more holistic and balanced view of a knowledge society. Adopting the perspective of triple bottom line shifts the purpose and design of a knowledge economy from one of aggregation and reporting to action and involvement. The World Bank's scorecard and indexing methodology are adaptable to this new perspective and a new set of indicators. 展开更多
关键词 knowledge economy index triple bottom line natural capital indicators human capital indicators societal regime intellectual capital economic indexes knowledge society
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