共查询到20条相似文献,搜索用时 46 毫秒
1.
针对金沙江—雅砻江梯级多业主水电站群联合调度补偿效益问题,建立了大规模混联水电站群联合优化调度模型,并提出离散微分动态规划(DDDP)和逐步优化算法(POA)相结合的自适应混合方法,实现大规模混联水电站群联合优化调度问题的高效求解。在此基础上,结合金沙江流域长系列历史径流资料,进行了不同建设运行和联合调度情景下梯级电站调度模拟,探究了金沙江中游梯级和雅砻江下游梯级的建设运行及联合调度对金沙江下游梯级的补偿作用。结果表明,金沙江中游梯级和雅砻江下游梯级建设运行可以增加金沙江下游梯级165.36×108kW·h的发电量;雅砻江下游梯级和金沙江下游梯级联合调度可增加梯级总发电量24.79×108kW·h,而金沙江中游梯级受较大保证出力的限制联合调度效益不够显著,可以通过降低其梯级保证出力,以便有效提高联合调度的补偿效益。 相似文献
2.
3.
流域梯级水库群汛前消落控制是水库调度的关键问题之一,而传统的判别系数法在确定水库群消落次序时未考虑弃水风险的存在,难以满足实际消落控制需求。为此,以金沙江下游梯级枢纽为例,构建了梯级水库汛前消落控制模型,针对不同典型来水并通过设定梯级各水库不同消落时机代入模型进行模拟调度,得到了梯级不同时机组合所对应的发电量和弃水量,从中推求出不同来水情景下兼顾发电和弃水的梯级水库最优消落时机。结果表明,确定的梯级消落控制方法能很好地适应不同的调度需求,可为金沙江下游梯级水库消落调度工程应用提供指导。 相似文献
4.
沅水流域梯级电站优化运行方式与效益分析 总被引:1,自引:1,他引:1
分析了当前丰枯、峰谷电价条件下沅水流域梯级电站联合调度方案以及优化运行产生的效益,提出了三板溪、托口、五强溪等调节能力较强的水库的水位控制方案,得出了相应的发电量和发电收入过程。同时分析了在优化运行情况下沅水全流域梯级电站对提高下游防洪能力所起的作用以及增加的发电效益。研究结果对沅水流域水库联合调度和水资源利用具有指导意义。 相似文献
5.
为更好地发挥经济及生态效益,建立了基于强化学习算法的梯级水库优化调度模型,以周尺度小浪底天然入库流量过程为基础,探讨梯级水库发电与生态目标之间的权衡,并将该模型应用于小浪底-西霞院梯级水库中,分别探讨了不同调度方案下发电最优、生态最优和发电-生态权衡的优化调度策略。结果表明,以发电最优为目标时,梯级水库多年平均发电量比常规调度增加了3.62%~7.92%;以生态最优为目标时,平均生态保证率比常规调度增加了31.68%~33.66%。结果为梯级水库多目标优化调度提供了一种可行方法。 相似文献
6.
为分析大渡河双江口水电站补偿调节对其下游梯级电站的发电补偿效益,建立了发电量最大化兼顾最小出力最大化的中长期水库群优化调度模型,采用逐步优化算法(POA)求解模型,比较分析了有无双江口水电站补偿下的梯级发电情况,研究了双江口水电站对大渡河梯级的发电补偿效益。结果表明,双江口水电站对下游梯级的发电补偿效益显著,其补偿调节可增加大渡河双江口以下24个梯级多年平均发电量约31.2×108kW·h,增加多年平均枯水期电量约60.2×108kW·h,提升多年枯水期平均出力166.6×104kW,提升多年枯水期最小出力205.5×104kW;按照目前上网电价水平,并考虑分期分时电价的情况下,双江口水电站的补偿调节可增加其下游24个梯级收入共计19.101×108元(含税)。 相似文献
7.
针对浑江梯级水库群汛期调度问题,建立了汛期洪水退水段梯级水库群发电优化调度模型,并用遗传算法对该模型进行求解.实例表明,该研究可减少弃水、增加发电效益,对指导汛期洪水退水段水库调度具有实用价值. 相似文献
8.
9.
10.
针对差分进化算法在进化过程中适应度的进化模式未考虑进化的外部环境与进化成分间的内在联系问题,结合电力市场环境下梯级水库中长期发电优化调度的特点,借鉴生态学对个体生存环境与种群竞争的关系,提出了协同差分演化算法在电力市场环境下梯级水库中长期发电优化调度中的应用.实例验证结果表明,该算法可靠、合理,计算精度与计算效率高,为求解电力市场环境下高维、复杂的梯级水库中长期发电优化调度模型提供了一种新途径. 相似文献
11.
12.
Peter J. Vassiliou 《Journal of Dynamical and Control Systems》2018,24(4):593-623
Let Pfaffian system ω define an intrinsically nonlinear control system on manifold M that is invariant under the free, regular action of a Lie group G. The problem of identifying and constructing static feedback linearizable G-quotients of ω was solved in De Doná et al. (2016). Building on these results, the present paper proves that the trajectories of ω can often be expressed as the composition of the trajectories of a static feedback linearizable quotient control system, ω/G, on quotient manifold M/G, and those of a separate control system, γ G , evolving on a principal G-bundle over a jet space. Furthermore, we point out that ω may not only have a static feedback linearizable quotient, ω/G but additionally, γ G itself may possess a static feedback linearizable reduction as well. This enables one to express the trajectories of an intrinsically nonlinear control system as the composition of the trajectories of static feedback linearizable control systems, thereby providing a geometric criterion for the explicit integrability of intrinsically nonlinear systems. Moreover, special integrability properties arise when G is solvable. Examples are presented in which the above phenomena are explicitly demonstrated. An important aspect of the examples is that they gather evidence for the conjecture that our sufficient conditions for explicit integrability are also necessary. 相似文献
13.
In this paper, we investigate the practical stability problem of nonlinear time-varying cascade systems. We give some sufficient
conditions that guarantee practical global uniform asymptotic stability and practical global uniform exponential stability
of such dynamical systems.
相似文献
14.
15.
16.
17.
O.St C. Headley 《Solar Energy》1973,15(3):245-258
This paper describes a new design for a tilted double-sided solar still with cascade water trays made of corrugated aluminium which are positioned 1·25 in. (3·2 cm) below the glass cover on insulated supports. The mean effective water depth is 0·7 in. (1·8 cm) which leads to high water temperatures (60° – 78°C) and a low thermal inertia (15 min) but is sufficient to ensure two days of maximum production before dry spots develop. Temperatures increase from the outer edges to the apex, hence the apex glass support is hollow and preheats the feed water when the still is fed continuously. At vapour temperatures of over 55°C the glass cover no longer condenses all the vapour so a secondary surface is positioned beneath the cascade, increasing the condensing ratio (ratio of condensing area to horizontal sunlight collector area) from about 1:1 to about 2:1 and allowing distillate collection from both surfaces. The cover produces 70–100 per cent of the distillate depending upon the vapour temperature. With batch feeding, thermal efficiencies of 60–75 per cent are usually obtained. These high efficiencies are due to the short distillation gap, the high condensing ratio, the low thermal inertia, and the fact that most heat transfer from the cascade to the condensing surfaces is accompanied by vapour transfer since radiative and conductive heat losses from the cascade are small. 相似文献
18.
19.
This paper looks at the similarities between the August 14, 2003 blackout and the Western System collapse of 1996. It was shown that the August 14 collapse resulted from system overloading that led to voltage deterioration in the system and consequently a "fast" collapse, similar to the July 2, 1996 collapse. 相似文献
20.
阐述了湾滩河流域梯级开发工程的自然环境分析了移民安置、工程施工对环境所产生的影响,针对不利影响,提出了相应的防治措施,使其得以控制或减免. 相似文献