Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 30, No. 9 (August 2017) 1336-1345    Article in Press

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  SELECTING EFFICIENT SERVICE-PROVIDERS IN ELECTRIC POWER DISTRIBUTION INDUSTRY USING COMBINATORIAL REVERSE AUCTION
 
R. Alaei and M. Setak
 
( Received: January 22, 2017 – Accepted: July 07, 2017 )
 
 

Abstract    In this paper, a combinatorial reverse auction mechanism is used for selecting the most efficient service-providers for resolving sustained power interruptions in multiple regions of an electric power distribution company’s responsibility area. Through this mechanism, supplying the required service in each region is assigned to only one potential service-provider considering two criteria including cost and service time. So, the corresponding winner determination problem of combinatorial reverse auction mechanism is formulated as a combinatorial optimization problem with two objectives: (1) minimizing the total requested cost, and (2) minimizing the average time for supplying the required service in multiple regions by potential service-providers. However, finding a feasible solution for the formulated problem as well as its solving is NP-complete. Since exact methods are failed in solving this kind of problems in a reasonable time, a problem specific NSGA-II which is an evolutionary algorithm for solving multi-objective optimization problems is developed to estimate the set of Pareto optimal solutions of the formulated bi-objective winner determination problem. In our developed NSGA-II, two problem-specific operators are proposed for creating initial feasible solutions and for converting infeasible solutions to feasible ones. Furthermore, a new method for determining the population size based on the size of problem instance is proposed. We conduct a computational experiment in which several randomly generated problem instances are solved using the proposed NSGA-II in different settings. Computational results of proposed algorithm in different settings are compared using a quality measure and statistical hypothesis tests. The results of performance comparison show that the proposed NSGA-II with a population size determined by proposed method and a different form of binary tournament method performs better in finding non-dominated solutions for different instances of formulated bi-objective winner determination problem.

 

Keywords    supplier selection, electric power distribution industry, combinatorial reverse auction, winner determination problem, multi-objective optimization, NSGA-II

 

چکیده    در این مقاله، از یک مکانیزم مناقصه ترکیبی برای انتخاب بهترین تأمین­کنندگان خدمات رفع خاموشی­ها در مناطق چندگانه واقع در محدوده مسئولیت یک شرکت توزیع نیروی برق استفاده می­شود. با استفاده از این مکانیزم، تأمین خدمات مورد نیاز در هر منطقه تنها به یک تأمین­کننده بالقوه با در نظر گرفتن دو معیار هزینه و مدت زمان تأمین خدمات تخصیص داده می­شود. بنابراین مسئله تعیین برندگان متناظر با مکانیزم مناقصه ترکیبی به صورت یک مسئله بهینه­سازی ترکیبی دو هدفه فرموله می­شود که توابع هدف آن عبارتند از: (1) کمینه­سازی هزینه کل درخواستی و (2) کمینه­سازی میانگین مدت زمان تأمین خدمات مورد نیاز در مناطق چندگانه توسط تأمین­کنندگان بالقوه خدمات. اما یافتن جواب موجه برای مسئله فرموله شده و نیز حل آن خیلی پیچیده است و روش­های دقیق قادر به حل این نوع از مسائل در مدت زمان معقول نمی­باشند. بدین دلیل از نسخه دوم الگوریتم ژنتیک با مرتب­سازی ناچیرگی که یک الگوریتم تکاملی برای حل مسائل بهینه­سازی چند هدفه است، برای تخمین مجموعه جواب­های پارتو مسئله دو هدفه فرموله شده استفاده می­شود. در این الگوریتم دو عملگر خاص مسئله برای ایجاد جواب­های موجه اولیه و تبدیل جواب­های غیرموجه به موجه و همچنین روش جدیدی برای تعیین اندازه جمعیت بر اساس اندازه مسئله ارائه شده است. عملکرد الگوریتم ارائه شده در تنظیمات مختلف با حل مجموعه­ای از مسائل نمونه که به صورت تصادفی ایجاد شده­اند، ارزیابی می­شود. کیفیت نتایج الگوریتم ارائه شده در تنظیمات مختلف با استفاده از یک سنجه مناسب و آزمون فرض­های آماری مقایسه می­شود. نتایج حاصل از مقایسه عملکرد نشان می­دهد که الگوریتم ارائه شده با اندازه جمعیت تعیین شده با روش جدید و با شکل متفاوتی از روش تورنمنت دودویی، عملکرد بهتری در یافتن جواب­های ناچیره مسئله دو هدفه تعیین برندگان در مکانیزم مناقصه ترکیبی دارد.

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