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arXiv 1801.02259math.OC
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多阶段随机机组组合的对偶近似动态规划方法

A Dual Approximate Dynamic Programming Approach to Multi-stage Stochastic Unit Commitment

Jagdish Ramakrishnan, James Luedtke

摘要:

本文研究了多阶段随机机组组合问题,在该问题中,机组组合和发电决策可以在每个时段内进行调整。我们制定这个问题作为一个马尔可夫决策过程,这是“弱耦合”的意义上说,如果需求约束放松,问题分解成一个单独的,低维的,马尔可夫决策过程为每个发电机。我们演示了如何调整Barty,Carpentier和Girardeau的对偶近似动态规划方法(RAIRO运筹学,44:167-183,2010)来获得该问题的边界和策略。以前的方法让拉格朗日乘子只依赖于时间,这可能会导致弱下界。其他方法让乘数依赖于过去随机观测的整个历史;虽然这提供了一个强大的下界,但它处理大量样本路径或场景的能力有限。我们演示了如何桥接这些方法的随机机组承诺问题,让乘数取决于当前观察到的需求。这允许在强下界与场景数量的良好可伸缩性之间进行良好的权衡。我们说明了这种方法数值上的168阶段的随机机组组合问题,包括最小的故障,停机时间,和斜坡的限制。

英文摘要:

We study the multi-stage stochastic unit commitment problem in which commitment and generation decisions can be made and adjusted in each time period. We formulate this problem as a Markov decision process, which is "weakly-coupled" in the sense that if the demand constraint is relaxed, the problem decomposes into a separate, low-dimensional, Markov decision process for each generator. We demonstrate how the dual approximate dynamic programming method of Barty, Carpentier, and Girardeau (RAIRO Operations Research, 44:167-183, 2010) can be adapted to obtain bounds and a policy for this problem. Previous approaches have let the Lagrange multipliers depend only on time; this can result in weak lower bounds. Other approaches have let the multipliers depend on the entire history of past random observations; although this provides a strong lower bound, its ability to handle a large number of sample paths or scenarios is limited. We demonstrate how to bridge these approaches for the stochastic unit commitment problem by letting the multipliers depend on the current observed demand. This allows a good tradeoff between strong lower bounds and good scalability with the number of scenarios. We illustrate this approach numerically on a 168-stage stochastic unit commitment problem, including minimum uptime, downtime, and ramping constraints.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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