共查询到20条相似文献,搜索用时 250 毫秒
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根据中期火电机组开机优化的特点,建立了兼顾传统模式及节能原则下电力运行的中期火电机组开机优化模型,并提出了一种改进的逐步优化算法(IPOA)对模型进行求解.算法以启发式搜索获得的初始可行解为基础,通过逐步优化算法(POA)对其不断改进,同时引入均化系统开机容量及合并单站开机容量峰值策略,使目标解从约束边界处沿目标等值线向可行域内部移动,为POA循环迭代提供搜索空间,有效地克服了POA易陷入局部最优的缺点.算法实现时,采用局部验证策略对开机容量峰谷持续时段约束进行简化判断,提高了计算效率.最后结合云南电网实际情况,对模型和算法进行了验证. 相似文献
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综合考虑综合能源系统(IES)在能效、经济、环境等多目标上的优化调度需求,提出一种IES的多目标优化调度模型及求解方法,以实现多能互补IES的节能减排、经济运行与环境友好调度运行。首先建立了满足IES在能效、经济、环境等方面的优化调度需求的多目标函数模型,并在能效目标函数中引入■效率,实现多能耦合系统的高效、高质量用能;其次建立了适用于多目标优化调度的IES数学模型,并通过模型凸松弛等方法保证模型的凸性,提高问题求解效率;再次建立了多目标优化调度问题帕累托前端的求解及运用方法,利用多目标凸优化问题的标量化方法进行模型转换,从而求解多目标凸优化问题,并提出筛选方法,用于从帕累托前端中筛选得到综合性能较好的调度方案;最后结合贵州省某IES算例仿真,验证了所建立多目标优化调度模型与求解方法在满足区域IES由于多能耦合而带来的多目标调度需求上的可行性。 相似文献
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梯级水库的发电调度问题本质上是一个高度非线性的数学规划问题,并且随着梯级规模的增大,其解空间变得极其庞大且无规则,这给梯级水库优化调度计算带来了巨大障碍。本文结合四川省某流域梯级电站的实际背景,把该梯级水电站发电收入最大作为目标函数,建立了包含约束条件的优化调度模型,运用逐步优化算法(POA)对模型进行寻优,克服了动态规划算法的"维数灾"问题,并考虑了电量约束比问题,最后给出了短期优化调度算例结果与分析,具有一定的实际应用价值。 相似文献
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针对当前各种启发式算法,如遗传算法(GA),粒子群算法(PSO),模拟退火算法(SA)等在求解水库优化调度中的不足,提出了将新型的集群智能算法-人工鱼群算法AFSA(Artificial Fish School Algorithm)用于求解水库优化调度问题。该算法通过模拟鱼群的一些基本行为,如捕食、聚群、追尾,来求解问题的最优解。根据水库优化调度问题的情况及数学模型,给出了基于人工鱼群算法的水库优化调度的求解策略,详细讨论了求解步骤,最后给出了实验仿真结果。结果表明该算法具有较强的局部搜索能力,同时也有更高的搜索效率,与其它方法相比,该算法能够找到更优解,验证了该算法的可行性和有效性。 相似文献
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建立了综合利用水库调度期内总缺水量最小为目标的一次优化模型,并将一次优化的水库放水过程作为来水过程,以总发电量最大为目标建立了水库二次优化调度模型。采用增量动态规划法对模型进行求解。通过在陕西省石头河水库中的应用,多种方式和方案的兴利优化调度结果表明,二次优化结果比用传统的模拟调度更为合理可靠。 相似文献
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This study presents a new method for deriving an operational model (rules) for the carryover storage reservoir water level at the end of year (WLE), which considered all of the operational information using an optimal model. To identify carryover storage reservoir WLE operation rules for a cascade reservoir system, the best approach is to exploit large databases using a data mining tool such as decision trees. Thus, we applied decision trees based on the iterative dichotomizer 3 (ID3) to the Wu Jiang cascade reservoir system to derive the carryover storage reservoir WLE operation rules. The rules derived can be used to guide optimal real-time operation in the long term. The results demonstrated that the solution derived using tree-based rules performed better than the existing design rules in terms of the power generation benefit, which satisfied the output of the cascade reservoir system. 相似文献
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Fuzzy rule-based model for hydropower reservoirs operation 总被引:3,自引:0,他引:3
Real-time hydropower reservoir operation is a continuous decision-making process of determining the water level of a reservoir or the volume of water released from it. The hydropower operation is usually based on operating policies and rules defined and decided upon in strategic planning. This paper presents a fuzzy rule-based model for the operation of hydropower reservoirs. The proposed fuzzy rule-based model presents a set of suitable operating rules for release from the reservoir based on ideal or target storage levels. The model operates on an ‘if-then’ principle, in which the ‘if’ is a vector of fuzzy premises and the ‘then’ is a vector of fuzzy consequences. In this paper, reservoir storage, inflow, and period are used as premises and the release as the consequence. The steps involved in the development of the model include, construction of membership functions for the inflow, storage and the release, formulation of fuzzy rules, implication, aggregation and defuzzification. The required knowledge bases for the formulation of the fuzzy rules is obtained form a stochastic dynamic programming (SDP) model with a steady state policy. The proposed model is applied to the hydropower operation of “Dez” reservoir in Iran and the results are presented and compared with those of the SDP model. The results indicate the ability of the method to solve hydropower reservoir operation problems. 相似文献
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R.K. Swain A.K. BarisalP.K. Hota R. Chakrabarti 《International Journal of Electrical Power & Energy Systems》2011,33(3):647-656
An efficient optimization procedure based on the clonal selection algorithm (CSA) is proposed for the solution of short-term hydrothermal scheduling problem. CSA, a new algorithm from the family of evolutionary computation, is simple, fast and a robust optimization tool for real complex hydrothermal scheduling problems. Hydrothermal scheduling involves the optimization of non-linear objective function with set of operational and physical constraints. The cascading nature of hydro-plants, water transport delay and scheduling time linkage, power balance constraints, variable hourly water discharge limits, reservoir storage limits, operation limits of thermal and hydro units, hydraulic continuity constraint and initial and final reservoir storage limits are fully taken into account. The results of the proposed approach are compared with those of gradient search (GS), simulated annealing (SA), evolutionary programming (EP), dynamic programming (DP), non-linear programming (NLP), genetic algorithm (GA), improved fast EP (IFEP), differential evolution (DE) and improved particle swarm optimization (IPSO) approaches. From the numerical results, it is found that the CSA-based approach is able to provide better solution at lesser computational effort. 相似文献
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水库群联合防洪预报调度方式对流域及城市防洪、水资源合理优化配置有重要意义。水库群联合调度不仅要考虑各水库自身约束和预报,还需考虑水库补偿关系,已有试算法经验性强、难以获得全局最优解。文章将优化技术与规划防洪预报调度相融合,提出考虑预报误差的预报调度规则的一般形式和求解思路,建立库群优化调度模型,优化求解各水库的防洪预报调度规则和汛限水位动态控制上限。以清河、柴河水库群为例进行研究,结果表明:联合防洪预报调度相比单库防洪预报调度,清河水库和柴河水库的汛限水位分别可多抬高0.4 m和0.3 m,最大可使汛期多蓄水0.62亿m3。研究结果可为水库群防洪预报调度提供参考和理论依据。 相似文献
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文章应用基于可信性理论的模糊潮流计算方法建立了输电网短期规划模型及其算法:首先根据当前电网负载水平评估结果采用灵敏度技术自动建立候选线路集;然后从候选线路集中选出线路形成不同的规划方案,建立输电网短期规划优化模型;最后用模糊潮流算法分析预想规划网架的运行性能,并通过遗传算法求解得到优化方案。算例分析证明了该模型与算法的有效性。文章的研究成果还可扩展应用于多重模糊因素共同作用下的电网规划。文章的模型与算法已在能量管理系统(energy management system,EMS)平台上实现,借助EMS系统提供的精确电网模型以及大量完整的电网运行数据,其规划结果的可信度得到了提高。 相似文献
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针对水库“以水定电”优化调度数学模型求解方法中,传统动态规划方法易陷入“维数灾”,而现代智能算法搜索效率低且易陷入局部最优解等不足。本文基于水库在高水头运行时耗水率小的特点,提出了水电站水库“以水定电”调度模型的快速求解方法——浮子算法。该方法在水电站满足保证出力和最小下泄流量等要求的前提下,尽可能提高水库调度期的运行水位以达到直接寻找优化调度解的目的。通过案例分析并与离散微分动态规划(DDDP)方法求解结果比较,本算法结果与DDDP算法十分接近,计算时间约为后者的50%。与其他算法联合使用,可在提高优化效果的同时缩短模型的求解时间,为水电站水库“以水定电”调度计划的制定和快速决策提供技术支持。 相似文献
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为充分发挥跨流域引水与区域水资源效益,城市供水水库群的联合调度成为水资源优化配置的关键。本文以深圳市西部城市供水系统的铁岗—石岩水库群为例,针对水库群供水"多对一"关系和水库群联合供水调度,建立水库群联合供水调度模型。本文首先针对"多对一"关系,分别采用主供水库添加联合调度线和构造"聚合水库"的方式建立供水调度模型;在石岩和铁岗水库调度图中分别设置提水线和提水限制线;然后将石岩—铁岗水库共同承担的供水任务分为4种供水方案,并采用模拟-优化的方式对水库群的调度规则进行求解。最后对各方案的调度效益进行对比与评价。 相似文献