共查询到20条相似文献,搜索用时 62 毫秒
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研究了南方电网某地区配电网的优化规划设计,采用基于分布优化法,分析了该电网的电源及负荷情况,建立了电力电量平衡计算模型,进行了电力电量平衡计算,根据电源和负荷的容量、距离及地理位置确定了电压等级,并提出了多种可行的电网接线方案,编制了潮流计算程序,进行了潮流计算分析,比较了各种接线方案下的电网电压可靠性、导线和变压器设备的投资、电能损耗及运行费用等,确定了最优的电网接线方案。 相似文献
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经过这几年的探索,不少行业协会加强了组织建设,在实践中得到了巩固与发展,取得了可喜的成绩。有些协会在机构改革中落实了部分职能,有些协会在企业改革、调整结构与脱困工作中有所作为,找到了位置,取得了企业的支持,积累了宝贵的经验。 相似文献
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于凌宇 《电力电容器与无功补偿》2011,32(2):1-8
笔者对新世纪初推出的新型高端电源元件锂离子电容器进行了论述,介绍了其发展历史,分析了该产品的组成结构和工作机理,定性定量探讨了其优异性能,以案例研究了其应用领域,逐项展现了其一系列新产品,辩证阐明了其发展前景,科学预测了其发展趋势. 相似文献
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把多媒体用于生物学科教育中,改变了教师传统的教学模式,转变了学生被动的学习模式,拓展了教学资源,提高了教学质量,收到了良好的效果。 相似文献
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《Power Delivery, IEEE Transactions on》1998,13(1):73-77
IEEE Standard 1344, Synchrophasors for Power Systems, was completed in 1995. It sets parameters required to ensure that phasor measurement will be made and communicated in a consistent manner. It specifies requirements for the timing signal used for phasor synchronization and the time code needed for input to a measurement unit. GPS is the recommended time source and IRIG-B is the basic format used for time communication. The standard requires correlating phasors computed from unsynchronized and synchronized sampling to a common basis. Timetagging accurately and consistently is essential for wide area comparison of phase. The standard specifies information exchange and control message formats. These include data output, configuration, and command messages. It includes 7 annexes that discuss the concepts covered in the body of the standard 相似文献
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Yuan Chen Westergard L. Mojarradi M.M. Johnson T.W. Cozy R.S. Billman C. Burke G.R. Kolawa E.A. 《Device and Materials Reliability, IEEE Transactions on》2006,6(2):146-153
A design for reliability methodology has been developed for electronics for low-temperature applications. A hot carrier aging (HCA) lifetime projection model is proposed to take into account the HCA impact on technology, analysis of parametric degradation versus critical circuit path degradation, transistor bias profile, transistor substrate current profile, and operating temperature profile. The most applicable transistor size can be determined in order to meet the reliability requirements of the electronics operating under low temperatures. This methodology and approach can also be applied to other transistor-level failure and/or degradation mechanisms for applications with varying temperature ranges. 相似文献
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介绍了全寿命周期成本管理理念及110kV GIS远景间隔可采取的预留方式,并对变电站110 kV GIS远景间隔的各种预留方式进行分析比较。 相似文献