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A. K. Mukhopadhyay

Bio: A. K. Mukhopadhyay is an academic researcher from University of Calcutta. The author has contributed to research in topics: Electric power system & Voltage optimisation. The author has an hindex of 2, co-authored 6 publications receiving 12 citations.

Papers
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Proceedings ArticleDOI
22 Nov 1989
TL;DR: In this article, the authors classified the common operating problems inherent in longitudinal power supply systems, including loadability, frequency dynamics, transient stability, power line oscillations, voltage control and stability problems.
Abstract: The common operating problems that are inherent in longitudinal power supply systems are classified. The main areas of this study are loadability, frequency dynamics, transient stability, power line oscillations, voltage control and stability problems. Typical longitudinal systems have been simulated to investigate these inherent problems. >

5 citations

Journal ArticleDOI
TL;DR: In this paper, an unique microprocessor based thyristor controlled method of controlling the VAR supply at the load node of a typical distribution system has been developed, which is a totally software dependent static VAR compensator enhancing its reliability and flexibility of control.
Abstract: An unique microprocessor based thyristor controlled method of controlling the VAR supply at the load node of a typical distribution system has been developed. The developed model is a totally software dependent static VAR compensator (SVC) enhancing its reliability and flexibility of control. The conventional hardware complexity being eliminated, a prototype working model has been developed for application in the laboratory. The developed scheme has also been found to be advantageous due to its symmetrical and accurate triggering control and quick response.

3 citations

Journal ArticleDOI
TL;DR: In this paper, a microprocessor based scheme has been developed for indicating phase sequences and the single-phase condition together with line to line, line to ground and double phase to earth faults of a three-phase supply and circuits.

2 citations

Journal ArticleDOI
TL;DR: In this paper, a microprocessor based ultra high speed relay has been developed for protection of a transmission line against open circuit fault which operates on the principle of continuous tracing of the line current waveforms thus eliminating sequence filters, and it requires less than one cycle to operate even in the worst possible fault condition.
Abstract: A modern power system consisting of multi-bus EHV/UHV transmission links to increase the capacity and reliability of the system, requires faster and reliable operation of relays and circuit breakers for its protection. The present day available relays for protection of transmission lines against open circuit fault are not sufficient for application in EHV/UHV circuits for their larger operating time. In the present paper, a microprocessor based ultra high speed relay has been developed for protection of a transmission line against open circuit fault which operates on the principle of continuous tracing of the line current waveforms thus eliminating sequence filters, and it requires less than one cycle to operate even in the worst possible fault condition. Application of a microprocessor enhances the accuracy, reliability and speed of operation of the device eliminating complicated hardware and dead band in operation. The use of zero crossing detectors in signal processing keeps the signals free f...

1 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, a generalized algorithm has been developed on the basis of Newton-Raphson load flow method for system simulation, which demonstrates that the magnitude of global stability can be ascertained on off-line basis for any variation of load in an interconnected network.

35 citations

Journal ArticleDOI
TL;DR: A novel guided search approach based on Edmond’s Maximal Spanning Tree Algorithm to achieve the optimal radial configuration for an arbitrary power network rapidly and efficiently is presented.
Abstract: The topological changes and re-configuration can be brought into an existing power network by operation of sectionalizing switches on the feeder lines. Distribution networks can be operated either in meshed or in radial configuration. While primary meshed distribution networks have advantages like lower short circuit current, reduced overall conductor length and increased reliability and fault tolerance, the radial networks on the other hand stand-out on their merits of simple installation and easier relay coordination. An optimal radial network can operate at higher efficiency owing to its reduced power losses and can offer higher voltage stability. Transformation of a primary meshed network to a radially reconfigured optimal network requires selection of the “best” set of switches on the feeders that are to be opened or closed so that each feeder can be operated close to its maximum loadability limit and the resulting optimal network operates at its lowest feasible value of power loss and highest voltage stability index. This theoretical concept of optimal power network radialization is however difficult to implement in practice due to the heavy computational burden and unacceptably long searching time as the number of feasible alternative configurations is usually massive for large power networks. Given the extent of the search space, the heuristic search approaches are usually more practical and common in power network reconfiguration. This paper presents a novel guided search approach based on Edmond’s Maximal Spanning Tree Algorithm to achieve the optimal radial configuration for an arbitrary power network rapidly and efficiently. Efficacy of the proposed method has been tested on 30-node and 57-node mesh distribution networks with encouraging results.

15 citations

Journal ArticleDOI
TL;DR: In this article, a novel application of graph theory, supported by Kruskal's maximal spanning tree algorithm, is proposed to search for the optimal network topology and to optimally convert an interconnected meshed network into a radial system to achieve best operati...
Abstract: —Alteration of power network topology is often required to meet important objectives, such as restoring connectivity, minimizing power losses, maintaining stability, maximizing power transfer capability etc., and is achieved by switching of circuit breakers and other switching devices in the power network. Primary power distribution networks are often interconnected and meshed but should be transformed to radial topology to achieve various operational advantages. Distribution networks also need to be reconfigured after faults to restore power at all the load points. Reconfiguring a power network, however, is a complicated multi-constrained optimization problem, as there may exist many feasible switching combinations in a large power network. This article proposes a novel application of graph theory, supported by Kruskal's maximal spanning tree algorithm, to search for the optimal network topology and to optimally convert an interconnected meshed network into a radial system to achieve best operati...

13 citations

Journal ArticleDOI
TL;DR: In this article, a microcomputer based fault protection scheme for indicating various types of faults in a radial transformer feeder in subtransmission or distribution circuits and its protection against those faults was developed.
Abstract: This investigation aims to develop a comprehensive microcomputer based fault protection scheme for indicating various types of faults in a radial transformer feeder in subtransmission or distribution circuits and its protection against those faults. The type of fault in the feeder can also be determined by observing the phase angles of the primary currents of the transformer with which the feeder is connected at its secondary. This method dispenses off conventional electromagnetic relays and HRC fuses in feeder protection schemes. The developed system provides necessary information regarding the faulted phase and displays appropriate symbols on the display screen of the microcomputer about the type of fault

7 citations

Proceedings ArticleDOI
01 Jul 2017
TL;DR: A novel methodology for selecting critical operating conditions (including operating point and contingency) for frequency stability studies and it is shown that some of the selected critical operating points have a worse dynamic performance than the one that would be normally chosen with the traditional worst-case approach.
Abstract: Transmission System Operators must regularly perform different stability studies in order to detect hazard situations in the system and to define proper corrective measures Due to the high computational burden required by dynamic simulations, the number of study cases must be strongly limited to only a few cases Ideally, only worst cases from a system stability point of view should be identified and used However, the increased complexity of power system dynamics under high levels of variable generation technologies makes it more difficult to define worst-case scenarios for stability assessments This paper proposes a novel methodology for selecting critical operating conditions (including operating point and contingency) for frequency stability studies The methodology considers key factors influencing the system frequency stability, such as the power imbalance, the frequency nadir, the system inertia, the ROCOF and the short circuit level at the point of the contingency The proposed methodology is validated considering the northern power system of Chile The dynamic simulations show that the proposed methodology is able to identify critical operating conditions for frequency stability assessments Furthermore, obtained results show that for the system under study, some of the selected critical operating points have a worse dynamic performance than the one that would be normally chosen with the traditional worst-case approach

6 citations