5901

5516

كارشناسي ارشد

قدرت

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

1389

ده،150ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

محمد اسماعيل همداني گلشن

اكبر ابراهيمي

21/2/90

مهندسي برق و كامپيوتر

ID5516

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Coordination of protective schemes in distribution and subtransmission systems including distributed generation Mohammad Sadegh Payam ms payam@ec iut ac ir 1 11 2010 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Persian M E Hamedani golshan hgolshan@cc iut ac ir Abstract Introducing Distributed Generation DG into the distribution and subtransmission systems has both positive and negative impacts One of the negative effects of DGs is on system protection This disturbance is caused by the change in value and direction of short circuits current due to DG implementation Fuse Recloser and directional over current relays are effective schemes for the protection of distribution and sub transmission systems respectively These protection systems are designed prior to implementation of DGs So that presence of DGs results in miss coordination of these schemes Several methods have been proposed to solve this problem These methods are expensive and have many constraints In this thesis this problem is dealt with revising protection schemes setting Actually instead of changing protection system structure or using new elements setting of current elements is changed In this thesis an optimized algorithm is proposed to design Fuse Recloser protection systems Proposed algorithm includes many steps In each step nominal values of Fuse and Recloser setting are designed using an optimization algorithm Also the effect of DGs in Fuse Recloser coordination is demonstrated and an optimized method is proposed to revise protection system Genetic Algorithm GA is used to solve this problem Several optimization techniques have been proposed to solve the overcurrent relay coordination problem In this thesis hybrid GA method is used to determine the optimal relay settings The hybrid GA method is designed to improve the convergence of conventional GA using a local LP optimizer There are two approaches for solving the relay coordination problem in presence of DGs minimizing relays operation time and minimizing number of relays setting changes Keywords Distributed Generations DGs Fuse Recloser Directional overcurrent relay coordination Hybrid genetic algorithm

محمد اسماعيل همداني گلشن

اكبر ابراهيمي