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采用非线性规划方法解决电力市场中机组多时段报价与发电计划问题。建立了考虑抽水蓄能电站的多时段发电计划模型,在排序的基础上考虑输电约束和网损对发电计划的影响,用非线性优化方法进行计算,得到满足报价和电网约束的最优发电计划。对一个6节点母线系统进行了多时段发电交易计划分析,结果显示电网输电约束和传输损失对发电计划产生影响,多时段发电计划优化能带来更大的全局经济利益。 相似文献
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本文根据电网内火电站及抽水蓄能电站的工作特性,对电网内抽水蓄能电站的吸收电能和填谷电能进行了其相应耗煤指标的还原分析,并考虑了因抽水蓄能电站的参与而改善电网内火电机组的运行状态所节省的能量,建立了抽水蓄能电站能源回收率模型,据此模型计算结果表明:抽水蓄能电站的能源回收率同其日发电历时T_0成双曲线关系,能源回收率随T_0的缩短而急剧增加,越接近尖峰负荷,节煤效果越显著。在目前技术水平下,能源回收率大于1。本横型具有使用简便省力省时的特点。 相似文献
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抽水蓄能电站日调节与周调节方式运行优化模型 总被引:6,自引:2,他引:4
丘文千 《水电自动化与大坝监测》2004,28(5):51-54
提出了抽水蓄能电站的日调节与周调节方式运行优化模型。按电站抽水 — 发电循环效益最大化,满足电力电量平衡条件,满足库容、发电出力及抽水功率等限制条件,建立了基于混合整数线性规划的算法模型,可应用于电源规划的系统运行模拟,优化抽水蓄能电站的运行方式和发电计划;分析了系统发电成本、电站规模、负荷特性等对电站运行的影响。通过计算实例对算法模型的实用性、有效性做了说明。 相似文献
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抽水蓄能电站的运行原理是利用电力负荷低谷时的电能把水抽至上水库,将水能转化为电能,在电力负荷高峰时期再放水至下库发电,将水能转化为电能,它将电网负荷低谷时的多余电能,转变为电网高峰时期的高价电能,起到电网调峰的作用[1]。下面从世界抽水蓄能电站格局、中国抽水蓄能电 相似文献
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丘文千 《水电自动化与大坝监测》2006,30(4):0-0
为满足实际应用的要求,在随机生产模拟中运用负荷曲线分解技术和动态规划,提出了抽水蓄能电站及其系统的概率模拟与运行优化模型。模型以系统发电运行成本与缺电损失最小为目标,满足电站水库蓄水及库容限制条件,满足日或周的抽水—发电循环电力电量平衡条件,并考虑了抽水蓄能电站在抽水和发电方式下随机停运的影响。可应用于电源规划、发电计划和系统运行优化,可以更准确地模拟、分析和优化抽水蓄能电站及其系统的运行状况。通过算例对模型和应用进行了说明。 相似文献
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针对在火电电网中加入抽水蓄能的问题,基于MATLAB优化工具箱建立节能调度模型。以电网煤耗量最小为目标函数,计算在相同等效替代不同发电方式下,抽水蓄能电站在调峰填谷时对电网的节煤效益;并对某个具有一定过剩容量的实际纯火电电网进行计算、分析。在当前的电网负荷下,通过抽水蓄能机组替代中小容量机组进行抽水蓄能调峰填谷效益的计算,得到不同抽水蓄能容量代替中小容量机组时的电网能耗和最佳抽水蓄能容量,得出了"随着抽水蓄能发电效率的提高,对给定的电源结构,同样容量的抽水蓄能,节煤量增大"等结论。 相似文献
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工程概况及施工特性 桐柏抽水蓄能电站是一座日调节纯抽水蓄能电站。主副厂房和主变压器室均在地下。厂房内安装4台立轴单级混流可逆式水泵水轮机,单机发电容量300MW,抽水容量330MW,总发电装机容量1200MW,总抽水容量1344MW。在华东电网中承担调峰填谷、调频调相及紧急事 相似文献
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根据冗各电站地下厂房开挖支护的施工顺序,以隐式杆单元模拟锚杆,以壳单元模拟混凝土喷层,采用三维非线性有限元技术,对洞室群的开挖支护动态过程进行了模拟计算。通过三维非线性有限元计算分析得到:洞室群动态开挖过程中围岩应力变形的分布规律,围岩塑性区的发展规律,锚杆受力变化情况。计算结果表明:整个开挖过程中,洞周围岩位移变化规律正常,量值较小,塑性区主要分布在洞室周边,围岩稳定性较好;但在洞室交叉口处围岩的变形较大,出现较大范围的塑性区,在此基础上提出了支护措施优化方案,并对优化方案的效果进行了评价。 相似文献
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The relocation of unionacean mussels is commonly used as a conservation and management tool in large rivers and streams. Relocation has been used to recolonize areas where mussel populations have been eliminated by prior pollution events, to remove mussels from construction zones and to re-establish populations of endangered species. More recently, relocation has been used to protect native freshwater mussels from colonization by the exotic zebra mussel Dreissena polymorpha. We conducted a literature review of mussel relocations and evaluated their relative success as a conservation and management strategy. We found that 43% of all relocations were conducted because of construction projects that were forced to comply with the Endangered Species Act 1973 and that only 16% were monitored for five or more consecutive years. Most (43%) relocation projects were conducted from July to September, presumably a period when reproductive stress is relatively low for most species and the metabolic rate is sufficient for reburrowing in the substrate. The mortality of relocated mussels was unreported in 27% of projects; reported mortality varied widely among projects and species and was difficult to assess. The mean mortality of relocated mussels was 49% based on an average recovery rate of 43%. There is little guidance on the methods for relocation or for monitoring the subsequent long-term status of relocated mussels. Based on this evaluation, research is needed to develop criteria for selecting a suitable relocation site and to establish appropriate methods and guidelines for conducting relocation projects. 相似文献
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In the lower River Murray, Australia, populations of gastropods have declined markedly over the past 40 years. Of the native fauna of about 18 species, only the ancylid Ferrissia petterdi remains common (but in patches), and another five species feature in sporadic local resurgences. Until recently the viviparid Notopala was thought to be extinct. The introduced physid Physa acuta is widespread, but in low numbers. The decline probably is associated with flow regulation, high turbidity and the introduction of common carp. Snail populations have persisted, however, in irrigation pipelines fed from the river, where they periodically cause blockages. This paper reports the discovery of the only known populaion of Notopala hanleyi in a pipeline where the inner wall accumulates microbial and other organic matter, providing high quality food for snails. In the Murray before regulation most of the periphytic biomass was probably microbial, as fluctuating water levels would have maintained littoral communities in a highly productive, early state of succession his postulated that, by stabilizing seasonal water levels, regulation has promoted the production of filamentous green algae, an inferior food source, and so displaced snail populations from the open aquatic environment. 相似文献
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V. K. Konovalov O. V. Yashkin V. V. Ermakov 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2008,42(2):105-109
A system for removal and pneumatic transport of fly ash is examined, in which air pulses act on batches (pistons) of ash formed
in a duct. Studies are made of the effect of several physical parameters on the force required to displace a piston of ash
and these serve as a basis for choosing a system for removal and pneumatic transport of ash simultaneously from several hoppers
of an electric precipitator. This makes it possible to separate the ash particles according to size without introducing additional
components. Formulas are given for calculating the structural and dynamic parameters of this system and measurements of indirect
dynamic parameters are used to calculate the input-output characteristics of the system. In order to optimize the system,
configurations for summing several ducts into a single transport duct for pneumatic ash transport are proposed. Some variants
of dry ash utilization and the advantages of producing of size-separated particles are considered.
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Translated from élektricheskie Stantsii, No. 2, pp. 26–30 (2008). 相似文献
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Peter B. Bayley 《河流研究与利用》1991,6(2):75-86
The ‘flood pulse advantage’ is the amount by which fish yield per unit mean water area is increased by a natural, predictable flood pulse. Evidence for this increase is presented from tropical and temperate fisheries. It is argued that increasing multispecies fish yield by restoring the natural hydrological regime is consistent with increasing production of other trophic levels and with restoration from ecological and aesthetic viewpoints. When applied to a river-floodplain system, this restoration would provide a large, self-sustaining potential for recreation, commercial exploitation, and flood control. An interim ‘natural flood pulse’ restoration approach is proposed for systems modified for navigation. This approach approximates the natural hydrological regime in a river reach and is intended as a first step in the long process of restoring the watershed. 相似文献
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简述天湖水电站投运以来各种故障的表现形式,分析其原因,提出了相应的处理方法及措施,并对合理利用国内外设备提出建议。 相似文献