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2003年的8月,充满了忧患与希望。 李海军lihaijun2001@263.net美加大断电9·11阴影在美国人的记忆中尚未完全消除,当地时间8月14日下午,美国东北部和加拿大东部联合电网发生大面积停电事故,此次停电共损失负荷6180万kW。区区三条输电线路发生故障却导致了这么大的 停电事故,表面上的简单,掩藏的却是美国电力电网多年积弱、管制宽严失度等深层次问题。停电34分钟 惊扰英国伦敦美加大停电余波未平,英国人正在讨论电网安全问题,当地时间8月28日傍晚,伦敦和英格兰东南部部分地区发生重大停电事故,虽然断电只持续了30多分钟,但从最初的那一刻… 相似文献
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介绍了蓄电池组在全厂断电工况下的作用;对蓄电池在全厂断电工况下的持续供电时间进行了分析,为处理全厂断电事故提供了时间依据;最后,为了确保在核电厂全厂停电工况下蓄电池的必要供电时间,提出了对蓄电池的养护建议及蓄电池事故的处理预案。 相似文献
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在考虑了可中断用户的风险偏好及不同停电持续时间对用户停电损失的影响的基础上,建立了一种基于机会约束规划的可中断负荷定价模型,并运用在遗传算法中嵌入蒙特卡罗随机模拟的方法求解该模型。最后通过算例仿真分析了不同用户的中断补偿与停电持续时间的关系,以及用户风险偏好对中断补偿及用户收益的影响。 相似文献
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城市电网用户停电损失估算及评价方法研究 总被引:11,自引:0,他引:11
合理地估算和评价城市电网中各类用户的停电损失,为电力企业在提高城市电网的可靠性水平及应急电源优化配置的投资和决策方面提供依据。在对受停电影响造成的各类用户的经济损失进行分类调查的基础上,以峰荷时刻的停电损失为基准,建立了表示综合用户停电损失和停电持续时间关系的综合用户停电损失函数,用以估算每类用户的综合停电损失。基本计算过程为,根据各类用户的综合用户停电损失函数和停电次数的统计结果,采用停电损失评价率和每次事故停电损失2个指标来评价每类用户的停电损失。采用青岛地区53个重要用户的数据为实际算例,估算并评价了各类用户的停电损失。所得结果表明,所提出的估算和评价用户停电损失的方法,有助于电力企业确定不同可靠性水平下的应急电源优化配置成本。 相似文献
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考虑提前通知的可中断负荷管理模型 总被引:3,自引:0,他引:3
在可中断负荷管理中,提前通知用户中断供电可有效减少用户停电损失。采用金融期权理论,给出了提前通知中断选择在可中断负荷合同模型中的计人方法,并着重分析了电力公司有关如何选择提前通知中断或临时中断的合理决策方法。算例仿真表明,对于不同停电损失特性的用户,电力公司会选择不同的中断策略。现货市场价格越高,用户被提前通知中断供电的可能性越大,而且提前通知中断的时间对中断决策具有重要影响。这些结果表明了所述方法的合理性和有效性。 相似文献
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瞬间断电是互连电路常见的一种失效模式。其产生原因是动态接触电阻的瞬间变化导致传输信号或能量的瞬间中断。它是影响电连接器接触可靠性的关键环节。文章在详细阐述动态接触电阻和瞬间断电等物理意义和影响因素的基础上,重点介绍了用于监测瞬间断电失效现象的新型瞬断检测仪的原理、特点和应用,并讨论了该类仪器在实际使用中遇到的一些问题。 相似文献
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缺电成本及其调查估算方法的探讨 总被引:3,自引:0,他引:3
介绍了缺电成本的类型及其影响因素,通过构造用户停电损失函数和利用缺电功率、缺电电量方法以及通过近似构造停电损失评价率,分别介绍了缺电成本的三种调查估算方法,并以此阐述了缺电成本与经济可靠性的关系。缺电成本的调查估算方法在实地应用后,说明缺电成本的调查估算方法是可行的。 相似文献
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电力市场和过渡期电力系统可中断负荷管理(一)--可中断负荷成本效益分析 总被引:28,自引:2,他引:26
可中断负荷运行是电力市场环境下负荷侧管理的重要组成部分,与电力系统安全经济运行密切相关.可中断负荷的成本效益分析是可中断负荷研究的基础。对该方面的研究进行了综述,分析了提前通知时间、停电持续时间、停电发生时间、缺电比率等因素对可中断负荷成本的影响,并得到一些可供参考的结论;随后介绍了可中断负荷对提高系统可靠性、削弱价格尖峰、减少运行成本等方面的贡献:最后对相关问题进行总结。 相似文献
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FRIENDS (Flexible, Reliable and Intelligent ENergy Delivery System) is a new concept for a future power delivery system in which so‐called QCC (Quality Control Center) plays an important role to realize the customized power quality services and to connect a large number of distributed generators to distribution systems. In FRIENDS, QCCs are connected as a network through distribution cables to realize a reliable power supply. In this paper, a method to find the optimal network configuration of FRIENDS is proposed. The method can minimize the sum of facility installation cost and operational cost (distribution loss) under the constraint that the expected power interruption cost is less than a predetermined endurable value. The solution algorithm is based on tabu search, and employs a sensitivity analysis to select efficient facilities to be installed or to eliminate constraint violations. In the algorithm, single and double faults of power distribution system are taken into account to calculate the power supply reliability or expected power interruption cost. Several numerical real‐world examples are shown to demonstrate the validity of the algorithm. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 156(3): 32–40, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20264 相似文献
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浅谈客户停电时间管理 总被引:1,自引:0,他引:1
创国内先进供电企业工作对客户停电时间提出了新的要求。分析了国内外先进供电企业的客户停电时间现状,阐述了当前供电企业在客户停电管理上存在的问题,从如何做到客户不停电、控制客户停电范围和停电次数,以及优化停电作业等方面,对客户停电时间的管理进行探讨。 相似文献
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缺电成本及其估计方法 总被引:14,自引:2,他引:14
缺电成本用于稀量断电或限电时用户的经济损失。在电力市场中,它是一个很重要的参数,与供电可靠性、负荷控制和电价规划密切相关的。我国在这方面的研究还处一开始阶段。本介绍了缺电成本的概念、影响因素和估计方法。 相似文献
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Sirichai Wattanasophon Bundhit Eua-arporn 《IEEJ Transactions on Electrical and Electronic Engineering》2009,4(6):736-741
An objective of protection system design is to support the system to serve its customers with highly reliable and low-cost power supply. In this paper, a radial distribution protection system design is formulated as a binary integer programming problem to identify number, types, and locations of the protective devices in order to optimize system total cost. The formulated problem takes into account not only the reliability of system components' but also the cost of utility investment and customer interruption, which comprises permanent and momentary interruption. The proposed method has been tested with an actual system with satisfactory results, from which it clearly shows the necessity of the inclusion of the customer interruption cost into the design problem. Copyright © 2009 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
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Yutaka Sasaki Hiroyuki Kita Eiichi Tanaka Jun Hasegawa 《Electrical Engineering in Japan》2009,167(2):28-37
The authors have proposed the Flexible, Reliable and Intelligent ENergy Delivery System (called “FRIENDS”), which is a new concept for future power distribution systems. Also, a “micro grid” which is a similar concept to FRIENDS has been developed. In a micro grid, an independent distribution system can be constituted by a number of distributed generators. In this paper, FRIENDS, Micro grid, and conventional distribution systems are compared quantitatively in supply reliability and system cost through time sequential Monte Carlo simulations. In addition, for cost evaluation, interruption costs are included to show risk incurred by unsupplied energy. Finally, the authors search for preferable form with install and operation of distributed generators and network composition according to social cost including interruption cost and system cost. © 2009 Wiley Periodicals, Inc. Electr Eng Jpn, 167(2): 28–37, 2009; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20659 相似文献
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输电线路的利用份额及损耗分摊问题 总被引:3,自引:0,他引:3
对在电流追踪法的基础上 ,结合电力网络本身的特性 ,合理计算各发电公司所应承担的输电费用 ,正确计及各发电厂对各输电线路的利用份额问题进行了分析。提出了一种适合于电力系统的输电线路的利用份额及损耗分摊计算方法。数字仿真结果表明该方法是可行的 相似文献
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A power outage brings in economic losses for both the customers and the utilities. Studying these unwanted events and making solid predictions about the outcomes of the interruptions has been an attractive area of interest for the researchers for the last couple of decades. By making use of a customer survey study conducted in Finland, this paper benefits from both the reported cost data collected from customers and from the analytical data that are available and then presents a new hybrid approach to estimate the customer interruption costs of service sector customer segment. Making use of Value Added information of the customers is a common practice for the cost normalization purposes. This paper verifies the approach by comparing the findings of the customer survey and the econometric model suggested here. This study is a unique source in terms of providing a reliable, easy to apply, and a straightforward model for calculating the economic impacts of power outages. 相似文献