University of Mohaghegh Ardabili Journal of Operation and Automation in Power Engineering 2322-4576 7 1 2019 05 01 Unit Commitment by a Fast and New Analytical Non-iterative Method Using IPPD Table and “λ-logic” Algorithm حل مسئله در مدار قرارگیری نیروگاه ها با یک روش تحلیلی غیرتکراری و سریع، با استفاده از جدول IPPD و روش “λ-logic” 27 39 738 10.22098/joape.2019.4427.1351 EN R. Kazemzadeh Department of Electrical Power Engineering, Sahand University of Technology, Tabriz, Iran. M. Moazen Department of Electrical Engineering, Faculty of Engineering, University of Bonab, Bonab, Iran Journal Article 2018 01 28 Many different methods have been presented to solve unit commitment (UC) problem in literature with different advantages and disadvantages. The need for multiple runs, huge computational burden and time, and poor convergence are some of the disadvantages, where are especially considerable in large scale systems. In this paper, a new analytical and non-iterative method is presented to solve UC problem. In the proposed method, improved pre-prepared power demand (IPPD) table is used to solve UC problem, and then analytical “λ-logic” algorithm is used to solve economic dispatch (ED) sub-problem. The analytical and non-iterative nature of the mentioned methods results in simplification of the UC problem solution. Obtaining minimum cost in very small time with only one run is the major advantage of the proposed method. The proposed method has been tested on 10 unit and 40-100 unit systems with consideration of different constraints, such as: power generation limit of units, reserve constraints, minimum up and down times of generating units. Comparing the simulation results of the proposed method with other methods in literature shows that in large scale systems, the proposed method achieves minimum operational cost within minimum computational time. https://joape.uma.ac.ir/article_738_7406d105702c1db91b9cd7893c59a90f.pdf