This paper presents Big-M method and Dual Simplex method for optimum time coordination of over current relays in a distribution network. These methods are used to find the optimized values of time multiplier settings (TMS) of relays using linear programming problem (LPP). Objective function contains artificial variables in Big-M method. Dual simplex gives the optimum solution without introducing any artificial variables. Over current (OC) relay plays a major role in power distribution system. It protects electrical power systems against excessive current which are caused by faults like short circuits, ground faults, etc. The fault is cleared within a least possible time. Big-M and Dual simplex technique are presented in this paper for optimum time coordination of OC relays in a radial fed distribution system. © 2015 IEEE.

Gnana Swathika O V

Electrical

School of Electrical Engineering

Chennai Campus

Hema Malini

Gupta A

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Optimum Coordination of Overcurrent Relays in Distribution Systems Using Big-M and Dual Simplex Methods

2015 International Conference on Computational Intelligence and Communication Networks (CICN)

A microgrid is a localized grouping of electricity sources and loads i.e. it is a small-scale power grid that normally operates connected to the centralized grid but can also disconnect and function autonomously. This papers proposes a LabVIEW based Central Protection Center (CPC) that remotely monitors a grid-connected microgrid using a wireless medium. The microgrid is divided into zones for ease of monitoring. The CPC is capable of continuously capturing the current status of the grid in a zonalised manner. If a fault is diagnosed by the central protection center, then it issues appropriate overcurrent relay coordination to the microgrid network. © 2018 IEEE.

2018 Second International Conference on Electronics, Communication and Aerospace Technology (ICECA)

Wi-Fi Based Central Protection Center for Microgrids

Microgrids comprise low voltage distribution systems with distributed energy resources (DER) and controllable loads which can operate connected to the medium voltage grid or islanded in a controlled and coordinated way [1]. Microgrids are controlled units which report their current state to a central control unit called Central Protection Centre (CPC) thus increasing reliability of the system. This feature also increases the controllability, security and ease of power flow. By connecting load centers to a microgrid, uninterrupted power is supplied to households and industries with reduction in energy theft, interruptions and loss in energy. However the challenge lies in automating the entire process of monitoring, protection and control of all the grid parameters. This becomes more critical with inclusion of DERs as they are inconsistent sources of energy. In this paper the concepts of Internet of Things(IoT) is used to solve the issues of microgrid reconfiguration occurring due to faults, changing energy usage patterns and inclusion and removal of DERs. By using suitable processor based technology it is aimed to automate the process, reduce the cost and size of establishment and reduce the overall cost of energy to the supplier. © 2018 IEEE.

IoT Based Microgrid Automation for Optimizing Energy Usage and Controllability

Advances in Intelligent Systems and Computing Intelligent Engineering Informatics

Optimal Coordination of Overcurrent Relays Using Simulated Annealing and Brute Force Algorithms

Electrical power grids are the backbone of all electricity distribution in the modern world. Faults in the microgrid may lead to blackouts or equipment damage. It stands to reason that we design our microgrids in such a way that a fault in a part of a network is isolated and does not propagate to the entire network causing a full blackout. Industry requirements specify that any fault leading from physical damage to the line, insulator flashovers, or even human error, be isolated within the affected section within instants of occurrence. This is because effects resulting from power line faults, such as overcurrents and voltage dips, are often seriously damaging to industry equipment which is expensive to replace. Hence the grid design should incorporate fault isolation and clearance procedures in order to obtain a reliable and adaptive protection system. Overcurrent relays have been found to be good fault isolators in microgrids. The relay must be protect the MG against faults in grid-connected and islanded modes and sense faults in the main grid in the former with high selectivity, sensitivity and reliability. The time coordination of overcurrent relay in microgrids may be achieved using different optimization algorithms. The algorithms considered in this paper are the Dual-Simplex method and the Karmarkar Algorithm. These algorithms contribute to the identification of the Time-Multiplier Settings of the overcurrent relays used in the microgrid. © 2017 IEEE.

2017 2nd International Conference on Communication and Electronics Systems (ICCES)

Microgrid fault clearance with linear programming algorithms

2017 International Conference on Computing Methodologies and Communication (ICCMC)

Optimum coordination of overcurrent relays in distribution systems using differential evolution and dual simplex methods

International Journal of Electrical Power & Energy Systems

Optimal overcurrent relay coordination in power distribution system using a new approach

2009 International Conference on Power Systems

Optimum coordination of overcurrent relays in distribution system using genetic algorithm

IEEE Transactions on Power Delivery

An on-line relay coordination algorithm for adaptive protection using linear programming technique

Optimal coordination of directional overcurrent relays in interconnected power systems

Journal	Data powered by Typeset2015 International Conference on Computational Intelligence and Communication Networks (CICN)
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