共查询到18条相似文献,搜索用时 390 毫秒
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针对云峰水库无防洪库容与下游防洪需求之间的矛盾,以防御常规洪水及100年一遇以下设计洪水为目标,基于现有的洪水预报方案,采用分步试算的调洪计算方法,将预报累积净雨、库水位及入库流量作为改变水库出流的判别指标,研究制定了云峰水库预报调度方案。结果表明,采用预报调度方案指导水库防洪调度能有效提高下游防洪能力,水库可在短时间内完成预泄,并有充足的退水余量确保水库回蓄,对水库兴利影响甚小,调度方案合理可行。分步试算的调洪计算方法能适应复杂的调度规则,有效解决了水位出流关系在控制水位处存在跳跃间断点的问题。 相似文献
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针对桓仁水库后汛二期弃水较多,洪水资源利用率不足,电厂效益低的问题,在分析桓仁水库后汛二期未来24h降水预报信息可利用性的基础上,制定了耦合洪水预报信息和降水预报信息的桓仁水库后汛二期实时防洪预报调度规则。风险分析结果表明,未来24h降水预报信息漏报时不会增加防洪风险,空报时也不会增加蓄水风险。应用所制定的洪水调度规则对13场实际洪水进行预报调度,在不降低原设计防洪标准的前提下,平均每场洪水减少弃水1.07×108 m3,增发电量1.96×106kW·h。研究成果可为水库后汛期洪水调度及资源化利用提供参考。 相似文献
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建立了一般水库群洪水调度系统的数学模型,并提出了补偿调度的求解方法,补偿调度的基本思路是:首先根据各水库的入库洪水过程,按照各水库的洪水调度规程从上至下进行独立调洪计算,再与区间洪水合成防洪控制点的流量过程;若出现超载水量,则从两方面调整各水库的泄洪策略(拦蓄与预泄),以达到避免或减少分洪水量的目的。所提出的通有型水库群洪水调度模型及补偿调度算法具有一般性,有利于编制开发通有型水库群洪水调度系统软件,其计算成果为制定人机交经方案提供了强有力的支持。 相似文献
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针对传统的洪水预报方案风险分析方法仅考虑设计变量的随机性而未考虑设计变量及失事准则的模糊性的不足,从考虑洪水预报失事准则的模糊性出发,计算了洪水预报系统的模糊风险。通过引入水平截集三角模糊数将预报失事准则模糊性转化为非模糊性,并结合传统的改进一次二阶矩(AFOSM)风险分析方法,给出了洪水预报各变量及系统的模糊风险区间值。实例应用表明,该方法得到的模糊风险能表示不同程度的风险值,比传统的风险确定值更符合实际,且可为决策者提供更多的决策信息。 相似文献
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随着绿色排水建设的推进,在现有城市排水系统基础上,研究排水管网与新型LID调控措施组合优化是一个亟待解决的现实问题。为此,提出了一种雨洪管理措施组合优化方法,基于水动力模拟软件SWMM和多目标优化算法GA进行联合求解,评估不同改造方案情境下的系统溢流量与建造费用之间的关系,研究管网改造和LID径流控制措施的个体作用和组合策略。案例研究表明,管网改造的工程经济性优于LID径流控制,采取适当的径流控制措施可帮助提高组合系统对雨洪的整体调控效果。此外,多目标优化方法的采用为两种改造措施提供了弹性的组合方案,亦对城市雨洪管理系统的建设具有一定的借鉴意义。 相似文献
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为了提高通胜山丘区来水模拟精度,解决通胜地区防洪安全问题,分析了洛阳河流域下垫面土地利用类型,并基于遗传算法构建水文模型进行洪水模拟。结果表明,近20年来,在现有气候、下垫面等变化环境下,洛阳河流域下垫面不同土地类型面积变化较大,快速城镇化使得旱地明显减少,水田增加11%,水面基本保持不变,水文模型参数也在发生动态变化,新水文参数与原始水文参数相差较大,前者模拟结果在径流深、洪峰、峰现时间、确定性系数4个方面均明显优于后者,可见基于遗传算法优化的水文模型参数能较好地反映现状下垫面水文情景。 相似文献
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A major challenge related to the design of a hybrid renewable energy hydrogen system is which energy sources to include and at what capacity, for regionally different potentials of renewable energy and hydrogen demand. In addition, once the plant is in operation, control variables need to be optimised. The problem resorts to an area of multiple criteria decision making referred to as multi-objective optimisation. The results obtained from these type of algorithms include not only one optimal solution, but a set of optimal solutions (Pareto front) thereby offering a system designer several options. This set of solutions can be hard to interpret and a method is needed to automatically extract useful design and control strategies from this information. A methodology that is quite successful in deriving human interpretable rules from this type of information is genetic fuzzy systems. In this work a k-means clustering algorithm is used to generate membership functions and a fuzzy rule-base is trained by means of a genetic algorithm. The genetic fuzzy system obtained is reduced by determining the minimum number of rules followed by a membership function reduction process. The reduced genetic fuzzy system is deemed more interpretable. Geographic weather data from three different sites are used to generate data to be used in the genetic fuzzy method. Results show that the technique provides valuable information that can be used for the design of such hybrid renewable energy hydrogen production systems. 相似文献
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Jie Yang Xi Li Jian Hua JiangLi Jian Lei ZhaoJin Guo Jiang Xiao Guang WuLin Hong Xu 《International Journal of Hydrogen Energy》2011,36(10):6160-6174
The tubular solid oxide fuel cell (SOFC) stack has important parameters that need to be identified and optimized for the control of high performance. In this paper, a simple SOFC electrochemical model which its parameters need to be optimized is introduced to implement stack control for high output power. A dynamic SOFC model is built based on three sub-models to provide a large numbers simulated data and different condition for optimization. Unlike the traditional parameter optimization method--simple genetic algorithm (SGA), an improved genetic algorithm (IGA) is introduced. The proposed method shows more accuracy and validity by comparing the different results using SGA and IGA methods, the simulated data, and experimental data. The models and IGA method are adapted to control processes. 相似文献