Browsing by Author "Vittal, K.P."

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A heuristic approach to distributed generation source allocation for electrical power distribution systems
(Iran University of Science and Technology, 2010) Manjunatha Sharma, K.; Vittal, K.P.
The recent trends in electrical power distribution system operation and management are aimed at improving system conditions in order to render good service to the customer. The reforms in distribution sector have given major scope for employment of distributed generation (DG) resources which will boost the system performance. This paper proposes a heuristic technique for allocation of distribution generation source in a distribution system. The allocation is determined based on overall improvement in network performance parameters like reduction in system losses, improvement in voltage stability, improvement in voltage profile. The proposed Network Performance Enhancement Index (NPEI) along with the heuristic rules facilitate determination of feasible location and corresponding capacity of DG source. The developed approach is tested with different test systems to ascertain its effectiveness.
A low SNR approach to substation communication using powerline for EMI reduction
(2012) Itagi, R.L.; Vittal, K.P.; Sripati, U.
Use of space time code concatenated with BCH (Bose Choudhari Hocquenghem) code is analyzed for performance in powerline channel with impulse noise. Performance of BCH-Space time code is worked in this paper for application of narrowband power line communication. BCH code (63, 36) with t=5 is designed and implemented in TMS320C6713 Digital Signal Processor, which is interfaced with Matlab version 7.4, where power line channel and impulse noise are simulated. These results are compared with Turbo coded OFDM scheme for powerline channel. From the results, reduction in carrier power requirement is found for BCH Space time code. Space time code has now become popular in wireless communication, as application in multipath channel. Since power line can provide different uncorrelated paths to realize multipaths effect, it is possible to apply space time code for powerline channel. In this paper, powerline is modelled as a multipath channel and impulse noise as Middleton class-A noise, on Matlab 7.4 platform. The BCH code of n=63, k=36, t=5, is designed and tested in a Digital Signal Processor (DSP) TMS320C6713. Interfacing is done using JTAG from processor to Matlab where power line, impulse noise and space time code are simulated. The performance of the system as communication system for narrowband PLC is tested for different channel and noise conditions. The results are used to find SNR requirement at a Pe (Probability of error) of the order of 10 -5 and for carrier signal strength to be within EMI (Electro Magnetic Interference) and EMC(Electro Magnetic compatibility) limits. Use of a BCH code with more better error correcting capacity, will further reduce the SNR requirement, hence will reduce carrier power. Â© 2012 IEEE.
Adaptive distance relaying scheme in series compensated transmission lines
(2010) Srivani, S.G.; Vittal, K.P.
The introduction of the capacitance in series with the line reactance adds certain complexities to the effective application of impedance based distance relays. The paper reviews series compensated line protection challenges and proposes the state of art relay with an integrated scheme in harmony with the present power system scenarios Development of the proposed scheme is in the specific area of incorporating the adaptive features like adaptive Relay setting as the compensation level changes in the series compensated lines of the transmission system for optimum reliability. Upon extensive testing on different data set of fault cases with fault resistance and varying percentage compensation level, performance of the developed method ensures that the proposed scheme overcomes the overreach / underreach problem of the distance relay in series compensated lines and is found to be quite promising.
Adaptive distance relaying scheme in series compensated transmission lines
(2010) Srivani Iyengar, S.G.; Vittal, K.P.
The introduction of the capacitance in series with the line reactance adds certain complexities to the effective application of impedance based distance relays. The paper reviews series compensated line protection challenges and proposes the state of art relay with an integrated scheme in harmony with the present power system scenarios Development of the proposed scheme is in the specific area of incorporating the adaptive features like adaptive Relay setting as the compensation level changes in the series compensated lines of the transmission system for optimum reliability. Upon extensive testing on different data set of fault cases with fault resistance and varying percentage compensation level, performance of the developed method ensures that the proposed scheme overcomes the overreach / underreach problem of the distance relay in series compensated lines and is found to be quite promising.
Adaptive Protection ofÂ Solar PV Microgrid Without ESS
(Springer Science and Business Media Deutschland GmbH, 2024) Meitei, L.P.; Vittal, K.P.; Pinto, J.A.
Conventional sources play a major role inÂ todayâ€™s power scenario. However, the trend has now been shifted toward non-conventional sources, viz., Solar, wind, tidal, etc. considering the depletion rate of fossil fuels, transmission losses and environmental impacts. As a result, Microgrids are getting popular nowadays due to its high reliability, nature of operation, and low operational cost. In this paper, an adaptive protection scheme is developed in MATLAB for a solar PV Microgrid without Energy Storage Systems (ESS) which can operate in both Grid connected mode (GCM) and Islanded Mode (IM). Â© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2024.
Adaptive protection schemes for feeders with the penetration of SEIG based wind farm
(2013) Rones, V.A.S.; Vittal, K.P.
Due to the increasing penetration of Distributed Generation (DG), conventional distribution overhead feeder protection schemes are prone to potential threats. In order to cope up with this, adaptive feeder protection schemes are required. This work involves the development and evaluation of an adaptive Overcurrent feeder protection scheme and an adaptive Recloser and Sectionalizers feeder protection scheme to vanquish the impacts of wind based DG which is highly intermittent in nature. PSCAD� is used to carry out simulations. MATLAB based software package for distribution system conductor sizing and protection coordination studies are also presented. � 2013 IEEE.
Adaptive protection schemes for feeders with the penetration of SEIG based wind farm
(2013) Rones, V.A.S.; Vittal, K.P.
Due to the increasing penetration of Distributed Generation (DG), conventional distribution overhead feeder protection schemes are prone to potential threats. In order to cope up with this, adaptive feeder protection schemes are required. This work involves the development and evaluation of an adaptive Overcurrent feeder protection scheme and an adaptive Recloser and Sectionalizers feeder protection scheme to vanquish the impacts of wind based DG which is highly intermittent in nature. PSCADÂ® is used to carry out simulations. MATLAB based software package for distribution system conductor sizing and protection coordination studies are also presented. Â© 2013 IEEE.
Air gap mixed eccentricity severity detection in an induction motor
(2011) Samaga, R.; Vittal, K.P.
Non invasive fault detection unit for an induction motor has become an integral part of industrial drives. As the current is the primary quantity to get affected by the non uniform air gap flux, Motor Current Signature Analysis is preferred as compared to vibration analysis for mixed eccentricity fault detection in an induction motor. In this paper, Power Spectral Density analysis is performed on the stator current data samples obtained from modeling and simulation of the induction motor. An Eccentricity Severity Factor is defined and is shown that this factor increases with increase of air gap eccentricity in the machine. Hence it can be used as a measure to assess the degree of eccentricity in the machine. � 2011 IEEE.
Air gap mixed eccentricity severity detection in an induction motor
(2011) Rajalakshmi Samaga, R.; Vittal, K.P.
Non invasive fault detection unit for an induction motor has become an integral part of industrial drives. As the current is the primary quantity to get affected by the non uniform air gap flux, Motor Current Signature Analysis is preferred as compared to vibration analysis for mixed eccentricity fault detection in an induction motor. In this paper, Power Spectral Density analysis is performed on the stator current data samples obtained from modeling and simulation of the induction motor. An Eccentricity Severity Factor is defined and is shown that this factor increases with increase of air gap eccentricity in the machine. Hence it can be used as a measure to assess the degree of eccentricity in the machine. Â© 2011 IEEE.
An integrated adaptive distance relaying scheme in series compensated transmission lines
(Universitatea Politehnica din Timisoara blucretiu@yahoo.com, 2011) Srivani Iyengar, S.G.; Vittal, K.P.
The introduction of the capacitance in series with the line reactance adds certain complexities to the effective application of impedance based distance relays. The paper reviews series compensated line protection challenges and present modern solution to improve the distance relay performance. The work presents development and evaluation of an integrated adaptive distance protection scheme. Development of the proposed scheme is in the specific area of incorporating the Adaptive features like adaptive Relay setting as the compensation level changes in the series compensated lines of the transmission system for optimum reliability. Upon extensive testing on different data set of fault cases with fault resistance and varying percentage compensation level, performance of the developed method ensures that the proposed scheme overcomes the overreach/underreach problem of the distance relay in series compensated lines and is found to be quite promising.
An ontology aided gso optimized extreme learning for situation recognition in coal mining environment
(Institute of Advanced Scientific Research, Inc. dheep.infotel@gmail.com, 2017) Ramesh, S.; Vittal, K.P.
A wireless sensor network (WSN) is a wireless network comprising of spatially distributed autonomous devices utilizing sensors for monitoring the physical or environmental situations. WSN has been applied in many fields such as healthcare monitoring, coal mine safety monitoring system and also in military. To detect the seismic activities in the coal mining environment, several techniques such as Bord and Pillar model, Bayesian Decision method etc., were introduced and carried out. In this paper, we have proposed anOntology aided Fuzzy Cognitive Maps (FCM) based feature correlation extraction technique for the multi attribute sensor data.Further, the Galactic Swarm Optimization (GSO) algorithm optimized Extreme Learning Machine (ELM) is used. The correlation extraction technique gives the better solution to determine the similarity between the semantically related heterogeneous sensor reading data and resolves the semantic ambiguity problem of heterogeneous sensors present in the coal mining Environment. © 2017, Institute of Advanced Scientific Research, Inc. All rights reserved.
Analysis of Pollution Level Near Mining Area using Neural Network
(Grenze Scientific Society, 2024) Bantwal, R.; Vittal, K.P.
The curve fitting analysis is performed on time-stamped signal values. Then a situational analysis graphical user interface (GUI) is developed to analyze the data which is from a mining area. The resulting waveform plots and the designed GUI are presented. The data is from the mining area namely Singrauli. Five environmental parameters related to pollution, namely CO, SO2, PM10, PM2.5, and Ozone are considered for the analysis using neural network. Â© Grenze Scientific Society, 2024.
Assessment of distributed generation source impact on electrical distribution system performance
(2010) Sharma, M.; Vittal, K.P.
The recent trends in electrical power distribution system operation and management are aimed at improving system conditions in order to render good service to the customer. The reforms in distribution sector have given major scope for employment of distributed generation (DG) resources which will boost the system performance. This paper proposes a heuristic technique for allocation of distribution generation source in a distribution system. The allocation is determined based on overall improvement in network performance parameters like reduction in system losses, improvement in voltage stability, improvement in voltage profile. The proposed Network Performance Enhancement Index (NPEI) along with the heuristic rules facilitate determination of feasible location and corresponding capacity of DG source. A Priority list is prepared with decreasing values of NPEI so that the designer can select most feasible location. The developed approach is tested with different test systems to ascertain its effectiveness. © 2010 AECE.
Comprehensive study of mixed eccentricity fault diagnosis in induction motors using signature analysis
(2012) Rajalakshmi Samaga, B.L.; Vittal, K.P.
Modeling and simulation studies of an induction motor always help in identifying the parameter to characterize the asymmetrical fault in the machine. Hence in this paper, an air gap eccentric induction motor is modeled using multiple coupled circuit approach and 2D-Modified Winding Function Theory. The machine model is simulated under different eccentricity conditions to obtain the motor current spectra, power spectra and power factor spectra to detect the eccentricity related frequency components and the results are compared. All these analysis are based on the variation in the amplitude of mixed eccentricity related frequency component in these parameters with the variation in the level of eccentricity in the machine. A new fault severity detection method based on co-variance analysis is presented to predict the degree of deterioration in the health of the machine due to air gap eccentricity from the installation stage. © 2011 Elsevier Ltd. All rights reserved.
Computation of electric field and thermal properties of 3-phase cable
(Universitas Ahmad Dahlan thsutikno@ieee.org, 2012) Rajagopala, K.; Vittal, K.P.; Lunavath, H.
In this paper the electric field distribution, potential distribution and temperature distribution in a 3-phase underground cable in common ground enclosure is analyzed and presented. Unlike 3-Phase screened cable the stress distribution in a belted cable is not radial. A 3-phase high voltage power cable buried in soil can be used to investigate its electrical and thermal properties. In the present study the voltage distribution of an underground cable of 132 kV is analyzed using FEM and its ampacity and temperature distribution is calculated by analytical method. Further their performance parameter is verified using Comsol Multiphysics software. The results obtained using comsol software is also compared with the results of CSM model which is obtained through literature review. © 2012 Universitas Ahmad Dahlan.
Computer controlled intrusion-detector and automatic firing-unit for border security
(2010) Vittal, K.P.; Ajay, P.P.; Ajay, S.B.; Rao, C.H.S.
This paper describes a novel computer-controlled intrusion-detector and automatic firing unit, which may be used for the surveillance of borders, either of a country, or of areas requiring high security, especially in regions of extreme climatic conditions, where it is difficult to deploy personnel. This system not only detects intrusion but also provides a video-coverage of the suspicious area, for remote vigilance, via a satellite based communication system. It is also provided with automatic firing mechanisms which can be used to automatically locate and fire at the target. Thus, several kilometres of the borders, which would have otherwise required several hundred personnel, can be effortlessly monitored with this system, with only a few personnel. Since, the actual firing occurs only after an authoritative personnel has doubly confirmed the presence of an intruder, chances of firing at innocent people are completely ruled out. As thermal cameras are used for imaging, this system is immune to changes in ambient conditions, and therefore, is equally suited for operation during the night. This paper also throws light on the prototype of this system, which has been successfully developed. � 2010 IEEE.
Computer controlled intrusion-detector and automatic firing-unit for border security
(2010) Vittal, K.P.; Ajay, P.P.; Shenoy, S.B.; Srinivas Rao, C.H.S.
This paper describes a novel computer-controlled intrusion-detector and automatic firing unit, which may be used for the surveillance of borders, either of a country, or of areas requiring high security, especially in regions of extreme climatic conditions, where it is difficult to deploy personnel. This system not only detects intrusion but also provides a video-coverage of the suspicious area, for remote vigilance, via a satellite based communication system. It is also provided with automatic firing mechanisms which can be used to automatically locate and fire at the target. Thus, several kilometres of the borders, which would have otherwise required several hundred personnel, can be effortlessly monitored with this system, with only a few personnel. Since, the actual firing occurs only after an authoritative personnel has doubly confirmed the presence of an intruder, chances of firing at innocent people are completely ruled out. As thermal cameras are used for imaging, this system is immune to changes in ambient conditions, and therefore, is equally suited for operation during the night. This paper also throws light on the prototype of this system, which has been successfully developed. Â© 2010 IEEE.
DC Fault Protection in Multi-terminal VSC-Based HVDC Transmission Systems with Current Limiting Reactors
(Korean Institute of Electrical Engineers, 2019) Muniappan, M.; Vittal, K.P.
Multi-terminal VSC-based HVDC transmission system is the recent interest for grid integration of large-scale offshore wind farms. Protection of multi-terminal voltage source converters (VSC)-based HVDC transmission systems against DC faults is challenging. This paper presents a single-ended protection scheme for DC faults in a three-terminal VSC-HVDC transmission system. The under-voltage criterion is used to distinguish the DC faults from the transient and normal conditions. The rate of change of DC voltage and current as well as the variation of transient energy is used to discriminate the internal faults from the external faults. The DC fault current has very high value within a few milliseconds during the transient phases such as the capacitor discharging and diode freewheeling stages. Therefore, current limiting reactors are introduced in series with the DC circuit breaker to maintain the DC fault current within the breaker capacity. The single-ended protection scheme is tested with the three-terminal VSC-HVDC transmission system with current limiting reactors for various DC fault conditions. The DC fault data is generated from PSCAD/EMTDC simulation and the protection scheme is tested in MATLAB environment. Test results show that the proposed protection scheme gives reliable protection for the DC faults in a three-terminal VSC-HVDC transmission system. © 2019, The Korean Institute of Electrical Engineers.
Design and modelling an attack on multiplexer based physical unclonable function
(Seventh Sense Research Group, 2020) Venkata, A.M.; Jeeru, D.R.; Vittal, K.P.
This paper deals with study of the physical unclonable functions and specifically the design of arbiter based PUF (APUF) and extends the work on different types of attacks on the PUF designs to break the security of the device, which includes advanced computational algorithms. Machine learning (ML) based attacks are successful in attacking existing designs. So in this, the resistance of the modified, proposed design of APUF is examined by modelling the attack based on the logistic regression a MLbased algorithm. The design is validated on Basys-3 Artix -7 FPGA board with a part number (xc7a35tcpg236-1). © 2020 Seventh Sense Research Group. All rights reserved.
Design and simulation of quadrilateral relays in ac transmission lines with vsc-based hvdc systems under phase-to-ground fault condition
(Politechnica University of Bucharest Splaiul Independentei 313 - Sector 6 Bucharest 77206, 2019) Muniappan, M.; Vittal, K.P.
Voltage source converters (VSC)-based high voltage direct current (HVDC) transmission system can be used to integrate the offshore wind power generation with an AC grid. Due to the interconnection of VSC-HVDC system with the AC grid, an operation of distance relays might get affected. Also, fault resistance plays a significant role in the performance of ground relays. The ground faults have higher fault resistance causes the accuracy of the ground relay gets affected significantly. In this paper, the three-zone quadrilateral characteristic-based distance relay is designed to protect the AC transmission lines under phase-to-ground fault with fault resistance. Simulation studies are carried out to test the performance of the quadrilateral relay under phase-to-ground fault including various fault resistance cases in an AC transmission line with the effect of VSC-HVDC system. The impact of the dynamic conditions of the VSC-HVDC system on the performance of the quadrilateral relays under phase-to-ground fault with fault resistance cases is presented. Also, the performance comparison of the quadrilateral relay with the mho relay under such conditions is presented. © 2019, Politechnica University of Bucharest. All rights reserved.