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基于小分段的中压架空线接线模式分析 总被引:1,自引:0,他引:1
线路分段数量与网架的紧密配合作为提高配电网可靠性手段之一,可以明显减少用户停电时间。文中在对可靠性与经济参数调研的基础上,将经济性和可靠性结合在一起,提出了一种高可靠性分段原则,继而提出了"小分段"的接线模式。研究表明,与国内习惯分段数(3~5段)相比,线路的分段数量大幅度增加,3~15km的10kV线路最优分段数增加为4~18段,有联络接线模式下系统平均停电持续时间指标从无分段的3.53~17.63h减小到分段后的0.67~2.19h,在保证社会经济效益的前提下显著提高了供电可靠性。最后,对影响最优分段数的参数进行了灵敏度分析,结果表明中压配电线路的最优分段数受到负荷开关单价、线路平均计划停运率、单位停电损失费用及负荷沿馈线分布情况的影响较大。 相似文献
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针对配电网规划方案可靠性测算中无法有效求解典型接线非整数分段情况下区域综合可靠性指标的问题,本文提出了一种基于典型接线最小分段偏差的线路配置组合方案可靠性测算方法.首先根据规划方案预设典型线路非整分段数、负荷总数;其次求解同时满足线路分段数预设量最小偏差和最优平均停电可用率指标(ASAI)的线路配置组合方案;最后采用故... 相似文献
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10 kV中压接线模式的选择受负荷密度、投资、可靠性等因素影响,是配电网规划与改造的关键。在不同负荷密度条件下,根据接线单元的供电能力确定所需数量。考虑多种因素对接线模式的投资成本和可靠性影响,结合用户停电损失综合函数,将可靠性与经济性进行属性转化。为了得到Pareto最优解,以影响接线模式的经济性、可靠性的线路参数建立初始种群,采用遗传算法(GA),以供电总成本最低为目标,获得任意负荷密度下的Pareto最优解集,从而建立中压接线模式的GA-Pareto优选模型。该理论已应用于中部某城市,为该市配电网建设提供理论依据。 相似文献
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基于空间GIS的城市中压配电网络智能规划(三)带开闭所接线模式的自动布局 总被引:5,自引:2,他引:3
在城市中压配电网中,除了变电站直供方式的接线模式外,还有一种可靠性更高的接线模式,即带开闭所的接线模式.文中首先在配电网空间地理信息系统(GIS)的环境下结合变电站选址定容的方法确定了开闭所的最佳数量和最优位置,然后对开闭所进线的最佳网络结构进行了自动布局,并运用多分段多联络接线模式自动布局的方法对开闭所出线进行了自动布局,提出了在不同负荷密度条件下多种接线模式灵活布局的一般性处理方法.最后通过对实际算例的分析验证了文中所述方法的可行性. 相似文献
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基于负载率的配电网变电站与开闭所规划 总被引:3,自引:2,他引:1
根据配电网中变电站和开闭所规划的特点,以负载率为主线,推导出用负荷密度和负载率表示的费用公式,并建立了以单位容量的年总费用最小为目标函数的变电站规划模型,用该数学模型进行了变电站经济供电半径、供电容量以及最优配置个数的规划。对于已建成变电站的区域又有新增负荷点的情况,根据负载率的大小考虑是否增设开闭所。根据负荷矩最小原则,将优化理论引入开闭所的规划,利用粒子群优化算法对变电站和开闭所进行选址。仿真结果表明利用粒子群优化算法进行变电站与开闭所的规划是可行的。 相似文献
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Fast restoration of critical loads and non-black-start generators can significantly reduce the economic losses caused by power system blackouts. In a parallel power system restoration scenario, the sectionalization of restoration subsystems plays a very important role in determining the pickup of critical loads before synchronization. Most existing research mainly focuses on the startup of non-black-start generators. The restoration of critical loads, especially the loads with cold load characteristics, has not yet been addressed in optimizing the subsystem divisions. As a result, sectionalized restoration subsystems cannot achieve the best coordination between the pickup of loads and the ramping of generators. In order to generate sectionalizing strategies considering the pickup of critical loads in parallel power system restoration scenarios, an optimization model considering power system constraints, the characteristics of the cold load pickup and the features of generator startup is proposed in this paper. A bi-level programming approach is employed to solve the proposed sectionalizing model. In the upper level the optimal sectionalizing problem for the restoration subsystems is addressed, while in the lower level the objective is to minimize the outage durations of critical loads. The proposed sectionalizing model has been validated by the New-England 39-bus system and the IEEE 118-bus system. Further comparisons with some existing methods are carried out as well. 相似文献
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改进的分步最优法在配电网开关配置中的应用 总被引:2,自引:0,他引:2
串接分段开关将馈电线分段,在技术上可以减少故障时间,缩小故障范围,提高配电网自动化程度。提出了一种开关配置模型,能够确定配置开关的总数以及每个开关的最佳安装位置,并采用改进的分步最优法进行求解。使开关配置在综合考虑设备投资、运行维护费用及系统可靠性基础上得到最佳的综合效益。采用改进的分步最优法求解多目标非线性优化问题,既避免了穷举法的“组合爆炸”问题,又能快速地得到最优解,而且能够非常灵活地处理任何复杂的树型馈线结构配电网。算例结果表明该算法的快速和有效性。 相似文献
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提出了一种变电站站址优化新方法,在保证电网网络结构满足供电可靠性要求的前提下,使电网建设及运行总费用最低。文中对与变电站站址相关的电网投资、运行费用作了分析,以变电站进出线投资及线路能耗折算综合总费用最小为目标函数,建立了进出线年综合费用最小模型。并探讨了利用该模型对多电压等级相互关联的多个变电站站址进行优化的方法,由于一开始并未确定上级电源点位置,需先利用出线年综合费用最小模型计算出电源变站址,然后再用进出线年综合费用最小模型对各待选站址进行整体优化。在实例计算中对进出线年综合费用最小、出线年综合费用最小及负荷矩最小三种模型进行了比较,结果表明进出线年综合费用最小模型能显著节省电网建设投资及运行总费用,是一种实用的变电站站址优化方法。 相似文献
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基于两联络接线模式的城市配网联络线优化 总被引:2,自引:1,他引:2
城市中压配电网规划和改造工作中,充分利用已有配电设备和线路走廊来提高配电网供电可靠性和传输能力至关重要。针对该问题,提出了一种基于两联络接线模式的分阶段双层联络线优化方法。外层优化是针对现状配电网应用遗传算法寻找最优的变电站遍历顺序;内层优化是基于外层优化的变电站遍历顺序,依次分阶段进行站间、站内联络线优化,形成两联络接线模式网架结构,并以所有联络线投资费用最小的优化方案为最终的联络线配置。通过实际规划算例计算,取得了较好的工程效果,为规划人员规划和改造配电网提供参考和借鉴。 相似文献
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Yasuhiro Hayashi Junya Matsuki Shinji Ishikawa Hirotaka Takano Eiji Muto Naoki Kobayashi 《Electrical Engineering in Japan》2009,167(1):56-65
In a distribution system, in order to enhance the reliability of power supply, the distribution feeder is divided into several sections by installing sectionalizing switches, and then each of the sectionalized sections is connected to a different feeder. For example, one feeder is divided into three sections by two sectionalizing switches, and then each of the divided sections is connected to the other feeder through sectionalizing switch. Since a distribution system with many feeders has many sectionalizing switches, the system configuration is determined by states (opened or closed) of sectionalizing switches. Usually, a power utility tries to obtain distribution loss‐minimum configuration among large numbers of configuration candidates. However, it is very difficult to determine the loss‐minimum configuration such that the mathematical optimality is guaranteed, because it is well known that determination of a distribution system's configuration is to decide whether each sectionalizing switch is opened or closed by solving a combinatorial optimization problem. In this paper, the authors propose a determination method of loss‐minimum configuration by which the mathematical optimality is guaranteed for a three‐sectionalized three‐connected distribution feeder network. A problem to determine the loss‐minimum configuration is formulated as a combinatorial optimization problems with four operational constraints ( feeder capacity, voltage limit, radial structure, and three‐sectionalization). In the proposed method, after picking up all partial configurations satisfied with radial structure constraint by using enumeration method, optimal combination of partial configurations is determined under the other operational constraints by using conventional optimization method. Numerical simulations are carried out for a distribution network model with 140 sectionalizing switches in order to examine the validity of the proposed algorithm in comparison with one of conventional meta‐heuristics (tabu search). © 2009 Wiley Periodicals, Inc. Electr Eng Jpn, 167(1): 56– 65, 2009; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20530 相似文献