共查询到20条相似文献,搜索用时 46 毫秒
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在黑河—和林220 k V输电线路工程中,针对采用钢芯铝绞线(JL/G1A-400/35)、碳纤维导线(ACCC/LH-185/25、ACCC/LH-210/35、ACCC/LH-240/35)4种导线设计方案中的线路输送容量、电阻损耗、工程造价和年费用进行了计算对比分析。结果认为:虽然4种导线均能满足输送容量的要求,但JL/G1A-400/35型钢芯铝绞线静态投资低、年费用最低,且电阻损耗小,具有良好的节能效果,因此在该工程中推荐采用。 相似文献
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针对铝合金芯铝绞线载流量计算复杂的特点,提出了一种铝合金芯铝绞线载流量的简化算法。首先研究了计算导线载流量的理论方法,根据钢芯铝绞线和铝合金芯铝绞线的特点分析两者在载流量计算中的差异,提出铝合金芯铝绞线载流量的简化算法,并使用该简化计算法计算了某种铝合金芯铝绞线在不同环境温度下的载流量值。然后对该种导线进行载流量试验记录载流量实测值,对比载流量计算值与实测值,分析简化计算法产生误差的原因。试验结果表明,该简化算法计算量小且计算精度满足工程要求,为铝合金芯铝绞线载流量的分析提供参考。 相似文献
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开展节能导线的应用研究,对重覆冰区域风电送出线路的安全、经济运行具有重要意义。以湖南某110 kV风电送出线路工程为例,针对其重覆冰、低损耗小时数的特点,从电能损耗、覆冰弧垂及过载能力、经济费用等方面对3类节能导线、钢芯铝合金绞线和普通钢芯铝绞线进行了应用分析。分析结果表明:在15 mm中冰区和20 mm重冰区,JL3/G1A-400/50型钢芯高导电率铝绞线更优;在30 mm重冰区,考虑弧垂特性和排杆需要,不适合采用节能导线,推荐采用钢芯铝合金绞线。 相似文献
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《The Electricity Journal》2001,14(9):31-43
A centralized transmission regime silences market signals necessary to spur needed investments. A competitive solicitation process that backstops a competitive market for transmission investment allows market signals to flourish and provides comfort to those skeptical of market forces. 相似文献
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架空线路输电能力计算 总被引:2,自引:0,他引:2
基于对架空输电线路的导线选型方法与导线载流量计算方法的分析,得出了决定导线输电能力的主要因素,给出了 220、500 kV架空输电线路常用导线热稳极限载流量的推荐值,并提出了提高江苏电网架空线路输电能力的措施与建议。 相似文献
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基于风险的输电断面经济输电功率计算 总被引:1,自引:0,他引:1
为有效协调电力系统运行安全性和经济性,更合理评估输电断面最佳运行功率,文中基于安全稳定风险分析与定量评估,提出了输电断面经济输电功率的概念,即使得断面输电的经济效益与系统失稳风险代价之差获得最大值时的断面输电功率值,并将故障下使系统保持稳定的紧急控制代价作为系统失稳风险。给出了输电断面经济输电功率的实用化计算方法和调度运行应用的建议。实际大电网的算例表明,输电断面按经济输电功率运行,可在系统安全风险可控的基础上获得更好的经济性。 相似文献
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Armen H. Zemanian Yaw‐Ruey Chan Victor A. Chang 《International Journal of Circuit Theory and Applications》1999,27(3):293-310
Proposed herein is a new method for solving arbitrary networks of nonuniform transmission ladders and lines. Two cases are considered, the first occurring when all circuit elements are purely resistive and in general non‐linear and the second occurring when they are linear but in general have both resistive and reactive components. The first case arises for example when the DC operating point of a non‐linear interconnection network is to be determined, and the second arises for example when the transient behaviour of a network of linear, possibly nonuniform, RLCG transmission lines and ladders is desired. Moreover, our method eliminates the voltages at internal nodes of a ladder and only treats nodes at which three or more ladders or lines meet or just one ladder or line terminates. The internal node voltages are obtained at the end of our procedure with very little additional computation. This provides a computational advantage, which may save orders of magnitude in computation time. A similar facility accrues to cascades of distributed lines and ladders. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
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计及输电阻塞的帕累托最优多目标电网规划 总被引:5,自引:2,他引:3
在解除管制环境下,要求输电扩展规划有效缓解输电网络阻塞,文中分别以年阻塞盈余、线路投资费用和系统缺电成本为规划目标,基于帕累托(Pareto)多目标最优建立综合考虑阻塞问题、经济性和可靠性的多目标电网规划模型,并通过一种改进的强度帕累托进化算法(strength Pareto evolutionary algorithm,SPEA),实现对模型的求解。建立一种基于多维空间欧氏距离的排序方法,实现帕累托最优解集范围内的优化决策。18节点系统算例表明通过改进SPEA可以有效形成分布均匀的帕累托解集,并且所提多目标规划方法能够缓解和控制规划网络的输电阻塞。 相似文献
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《The Electricity Journal》2000,13(6):28-37
The creation of three consumer-owned, nonprofit transmission companies for the transmission systems of the Eastern, Western, and Texas Interconnections would allow the transmission system to be owned, operated, maintained, and planned in ways that minimize costs to consumers and damage to the environment. 相似文献
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Vojdani A.F. Imparato C.F. Saini N.K. Wollenberg B.F. Happ H.H. 《Power Systems, IEEE Transactions on》1996,11(1):41-51
This paper is based on the material presented at the IEEE 1994 Winter Power Meeting Panel on Transmission Access issues, sponsored by IEEE task force on transmission access. The paper contains short notes by four panelists on transmission access: (1) institutional issues; (2) planning and operation issues; (3) analytical issues; and (4) economic issues 相似文献