A Voltage Based Optimal Relay Coordination using PSO in Distributed Generation Penetrated Distribution System
Authors: Bharat Pokharel, Nava Raj Karki, Netra Prasad Gyawali, Khagendra Thapa, Akhileswar Mishra
Abstract— Distribution system (DS) has always some degree of unsafety due to unavoidable chances of fault that may occurs in the system. The proper protection in DS is one of the biggest challenge before the power engineer due to increase in penetration level of various kind of distributed generations (DGs). Any type of fault that may occur on the DS should be cleared as soon as possible to prevent the supply outage for healthy part of the system. There are different types of safety equipment for their own assigned job. So depending upon the nature of fault, Location of fault and mode of operation of the distribution system, right equipment should operate in a right time at right condition. This becomes more complex when overcurrent based protection is used in DS having distributed generations of different topology, specifically inverter based type. This research presents the use of particle swarm optimization (PSO) technique to achieve the objective of the development of effective optimal protection coordination in DS using the fault voltage as relay actuating quantity. DIgSILENT Power Factory Tool and MATLAB platform are used for fault analysis and development of coordination program respectively. The developed program was tested for 6 node low voltage (LV) distribution network and 95 node medium voltage (MV) distribution network with injection of DGs. In the research it has been found that the PSO algorithm provides the faster operating time of primary relays resulting lower value of the objective function.
The developed effective coordination algorithm of voltage based relays with PSO is found to be practically, the more efficient, sensitive and discriminative method for relay coordination in both low and medium voltage of distribution system. The method shows that voltage based protection system is faster than current based protection system in DS with DGs.
Keywords: Protection, Relay, Voltage, PSO, DS, DGs
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Published In: International Conference on Role of Energy for Sustainable Social Development in ‘New Normal’ Era (RESSD-2020)
Date of Conference: 28th-29th December 2020
Conference Location: Kathmandu, Nepal
Publisher: IEEE Power and Energy Society Nepal Chapter
Cite the paper as:
B. Pokharel, N. R. Karki, N. P. Gyawali, K. Thapa, A. Mishra, “A Voltage Based Optimal Relay Coordination using PSO in Distributed Generation Penetrated Distribution System”, International Conference on Role of Energy for Sustainable Social Development in ‘New Normal’ Era, 28th-29th December 2020, Kathmandu, Nepal