中文摘要：

机组组合与经济调度是两个不同范畴的优化决策问题,其优化过程在概念上有本质的区别.用经济调度中的拉格朗日乘子对机组组合中的乘子进行修正有概念含混的误区.文章在阐明机组组合与经济调度中拉格朗日乘子的差异及作用机理的基础上,提出了一种新的逆序排序机组组合中拉格朗日乘子的修正方法,并对机组的搜索范围及机组运行的经济指标作了相应的改进,使原有算法在精度和计算速度上均得到了显著提高.20机、26机及110机测试系统的计算结果表明了文中的改进方法是有效的,进一步增强了机组组合对大规模系统的适应性.

英文摘要：

Unit commitment （UC） and econonaic dispatch （ED） belong to optimization and decision-making problems in two different categories, and there are essential differences in their optimization processes conceptually. When Largrangian multipliers in ED are applied to modify the Largrangian multipliers in UC, the concept is indistinct. On the basis of expounding the difference between Largrangian multipliers in ED and the ones in UC and their mechanisms of action, a new method of modifying Largrangian multipliers in unit decommitment （UD） is proposed. The proposed method reduces search range and improves economical indices of units correspondingly, so the accuracy and calculation speed of original method are evidently enhanced. The calculation results from 20-, 26- and ll0-machine test systems show that the proposed method is effective, which can further enhance the adaptability of UC to large scale power system.