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Modified Techniques for Distribution System Reliability Improvement by Parallel Operation of Transformers

Authors: Ohn Zin Lin, Okka, Cho Cho Myint


It is important to consider the effects of transformers on distribution system because they have the highest impact on system reliability. It is generally said that parallel operation of transformers (POT) can improve the system reliability. However, the estimation approach can be also considered for accuracy. In this paper, we propose a three-state components model and equations to determine the reliability improvement by POT, and cooperation of POT and distributed generation (DG). Based on the proposed model and techniques, the effect of POT is analyzed in four different tests with the consideration of conventional distribution system, distribution automation system (DAS) and DG. According to the results, the reliability is greatly improved by cooperation of POT, DAS and DG. The proposed model and methods are applicable to not only developing countries which have conventional distribution system but also developed countries in which DAS has already installed.

Keywords: Reliability, Distribution System, dispersed generator, energy not supply, transformer parallel operation

Digital Object Identifier (DOI):

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[1] R. Billinton and S. Jonnavithula, “A Test System For Teaching Overall Power System Reliability Assessment”, IEEE Transactions on Power Systems, Vol. 11, No. 4, November 1996.
[2] L. G. W. da Silva, R. A. F. Pereira and J. R. S . Mantovani, “Optimized Allocation of Sectionalizing Switches and Control and Protection Devices for Reliability Indices Improvement in Distribution Systems”, 2004 IEEElPES Transmission & Distribution Conference & Exposition: Latin America.
[3] Kai Jiang and Chanan Singh, “New Models and Concepts for Power System Reliability Evaluation Including Protection System Failures”, IEEE Transactions on Power Systems, VOL. 26, NO. 4, November 2011.
[4] An Jing and Yang Jingyan, “Reliability evaluation for distribution system considering the correlation of wind turbines”, 2011 IEEE.
[5] P. Sritakaew and A. Sangswang, “Reliability Improvement of a Distribution System Using PV Grid Connected System with Tie Switch”, 2006 IEEE.
[6] Peyman Mazidi and G.N. Sreenivas, “Reliability Analysis of A Radial Distributed Generation Distribution System”, (IJEEE), ISSN (PRINT): 2231-5284, Volume-3 Issue-2, 2013.
[7] A.M. Abdullah, “New Method for Assessment of Distributed Generation Impact on Distribution System Reliability: Islanded Operation”, IEEE PES ISGT ASIA 2012.
[8] Mohammad Al-Muhaini, “Evaluating Future Power Distribution System Reliability Including Distributed Generation”, IEEE Transactions on Power Delivery, Vol. 28, No. 4, October 2013.
[9] I. Waseem and M. Pipattanasomporn, “Reliability Benefits of Distributed Generation as a Backup Source”, Power & Energy Society General Meeting, 2009. PES '09. IEEE.
[10] Stefania Conti, Santi Agatino Rizzo, Ehab F. El-Saadany, Mohammed Essam, and Yasser M. Atwa, “Reliability Assessment of Distribution Systems Considering Telecontrolled Switches and Microgrids”, IEEE Transactions on Power Systems, Vol. 29, No. 2, March 2014.
[11] Qinghai Meng and Tingzheng Wang, “Effects of Distribution Automation on Distribution System Reliability”, ITEC Asia-Pacific 2014.
[12] Karin Alvehag and Lennart Söder, “A Reliability Model for Distribution Systems Incorporating Seasonal Variations in Severe Weather”, IEEE Transactions on Power Delivery, Vol. 26, No. 2, April 2011.
[13] A.E.D.C. Tio and I.B.N.C. Cruz, “A Binary Formulation of SAIDI for the Predictive Reliability Assessment of Radial Distribution Systems with Tie-lines”, IEEE 2013 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC).
[14] Roy Billition and Ronald Allan, “Reliability Evaluation of Power System”, New York, 1984
[15] Prof. Krishna Vasudevan, Prof. G.Sridhara Rao and Prof. P.Sasidhara Rao, “Electrical Machines I”, India Institude of Technology Madras.
[16] E. Tom Jauch, “Factors in Choosing Transformer Paralleling Methods”, Transmission and Distribution Conference and Exhibition, 2005/2006 IEEE PES.
[17] Nick Jenkins, Ron Allan, Peter Crossley, Daniel Kirschen and Goran Strbac, “Embedded Generation”, 2008.
[18] Ohn Zin Lin and Hajime Miyauchi, “Optimal Replacement Time of Electrical Components Based on Constant-Interval Replacement Model: Equipment Inspection Method and Weibull Analysis”, Energy and Power Engineering, 2017, 9, 475-485.