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P. P. J. Van Den Bosch F. A. Lootsma 《Journal of Optimization Theory and Applications》1987,55(2):313-326
We investigate methods for solving high-dimensional nonlinear optimization problems which typically occur in the daily scheduling of electricity production: problems with a nonlinear, separable cost function, lower and upper bounds on the variables, and an equality constraint to satisfy the demand. If the cost function is quadratic, we use a modified Lagrange multiplier technique. For a nonquadratic cost function (a penalty function combining the original cost function and certain fuel constraints, so that it is generally not separable), we compare the performance of the gradient-projection method and the reduced-gradient method, both with conjugate search directions within facets of the feasible set. Numerical examples at the end of the paper demonstrate the effectiveness of the gradient-projection method to solve problems with hundreds of variables by exploitation of the special structure. 相似文献
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Jrg Doege Max Fehr Juri Hinz Hans-Jakob Lüthi Martina Wilhelm 《European Journal of Operational Research》2009,199(3):936-943
Since the 1990s power markets are being restructured worldwide and nowadays electrical power is traded as a commodity. The liberalization and with it the uncertainty in gas, fuel and electrical power prices requires an effective management of production facilities and financial contracts. Thereby derivatives build essential instruments to exchange volume as well as price risks. The challenge for participants in the newly competitive market environment is how to design, price and hedge derivative contracts in particular combination with the flexibility embedded in dispatch strategies of production assets. Accordingly, an adequate basis for management and investment decisions is needed which responds to the highly complex market situation. 相似文献
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科技的进步与发展,促使企业需要考虑"业务重组"、"流程再造",如何选择现代化通讯设备,搭建信息化管理平台,建设一套稳定、高效、安全的集群通信调度系统以达到最佳性价比,又保持足够的、经济的、可持续发展的空间,是所有机场面临的共同问题。 相似文献
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介绍了开发DMIS中ACC车次输入(自动和半自动)的界面,讨论了网络套接口的数据通信机制在本应用程序中的具体实现,还介绍了开发过程中的难点及其解决办法. 相似文献
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电力市场改革使得系统发生阻塞的概率越来越大,因而阻塞管理成了电力系统运行的一个主要问题。目前的电力市场多采用联营体与双边合同混合的交易模式。在同一个市场中,两类不同模式的交易之间存在很强的耦合性。当输电容量不充裕时,改变其中一类交易的电力调度都有可能对另一类交易产生直接影响。因此,如何很好地协调调度两类电力交易,是混合市场阻塞调度的一个重要问题。本文发展了一个适用于不同报价函数形式的通用统一清除价计算模型,并提出了一个新的混合市场阻塞协调调度数学模型,通过引入一个协调调度约束,能够直观地处理系统中两类交易的优先性,实现两类交易的协调调度。此外,模型允许在联营体市场中对被削减的合同出力进行再调度。这有利于充分利用发电容量和降低联营体市场的购电成本。最后,以IEEE单区域RTS-96系统为例,对所提出的模型进行了说明和分析。 相似文献
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王庆飞 《河南师范大学学报(自然科学版)》2007,35(3):161-164
在局域预测法的基础上重点分析了一种基于Lyapunov指数的混沌时间序列预测方法,并将这种方法应用于解决电力系统短期负荷分配问题,得到了较好的仿真预测结果. 相似文献
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Competitive analysis of a dispatch policy for a dynamic multi-period routing problem 总被引:1,自引:0,他引:1
We analyze an on-line algorithm (dispatch policy) for a dynamic multi-period routing problem. The objective is to minimize the total cost over all periods. We show that the competitive ratio of this policy for instances with customers located on the non-negative real line is . 相似文献
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电力经济环境负荷调度的模糊多目标模型 总被引:1,自引:0,他引:1
电力经济与环境负荷调度(Environmental/Economic Power Dispatch,EED)已成为当前经济与环境和谐发展下电力系统需考虑的问题。针对EED问题中以发电单元实际发电量作为决策变量的非线性燃料成本函数和微粒排放函数,引入模糊集方法构造发电单元实际发电量的模糊变量,以贴近电力系统中发电单元发电量的特点,使得EED问题的模糊化多目标模型更贴近实际,并采用一种改进遗传算法来找出EED问题模糊化多目标模型的优化方案。最后采用一个3发电单元的测试系统进行仿真并与其他方法进行对比,结果证明采用本文模型和方法得到的系统负荷调度方案在系统经济成本与微粒排放量上有明显的改善。 相似文献
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