Qualification: 
M.Tech, B-Tech
angelts@am.amrita.edu

Angel T. S. currently serves as Assistant Professor(Sr. Grade) in the Department of Electrical and Electronics Engineering at Amrita School of Engineering, Amritapuri. She has completed B. Tech. in EEE from Mar Athanasius College of Engineering, Kothamangalam in the year 2009 and M. Tech. in Power Systems from College of Engineering, Trivandrum in the year 2012. She is currently pursuing her Ph.D.

Research Interests: ANN and Fuzzy Logic for Artificial Intelligence Applications in Smart Grid, Machine Learning and Deep Learning Applications in Smart Grid, Evolutionary Optimization Techniques for Smart Grid/Microgrid Operation and Control. Monitoring, Analysis, and Protection of Power System, Power Electronics Application in Smart Grid and Micro Grid.

Publications

Publication Type: Conference Paper

Year of Publication Title

2020

K. Raveendran, R. Sachin, S., Christy, A., and T. S. Angel, “Intelligent monitoring system for submersible motor protection”, in Proceedings of the World Conference on Smart Trends in Systems, Security and Sustainability, WS4, 2020.

2019

G. S. Ayyappan, Nikhil, N. K., Raja, R. M., T. S. Angel, and Babu, R. B., “Electrical Motor Maintenance Techniques and Life Cycle Assessment- A Review with Case Studies”, in Proceedings of the 2019 2nd International Conference on Power and Embedded Drive Control, 2019.[Abstract]


Electric motors are one of the biggest consumers of electricity across the world. They account for almost 40-45% of the electricity utilized by the industry. This growth is almost two times fast as the comprehensive demand for energy across the world and it is the highest since 2010. Therefore, the use of electrical motors should be in an efficient way, so that energy consumption will be kept under minimum value. Life Cycle Assessment (LCA) of an electric motor is the method of finding the whole impact it will have during the total lifetime Predictive maintenance is one of the few methods for making the motor work in its full potential. This study focuses on different LCA techniques and maintenance techniques of electric motors. © 2019 IEEE.

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2017

S. P. Anjana and T. S. Angel, “Intelligent demand side management for residential users in a smart micro-grid”, in 2017 International Conference on Technological Advancements in Power and Energy ( TAP Energy), Kollam, India, 2017.[Abstract]


Demand Side Management (DSM) is a vital function of smart grid to manage energy. The DSM can attain reduction in energy utilization, energy usage efficiency enrichment and cost saving via information technologies and developed optimal methods. The demand side management strategy for residential users in a smart micro-grid is proposed. The proposed Demand Side Management system for demand response applications which can anticipatorily and efficiently control and manage the operation of various appliances to keep the total power consumption below a specified power limit. To do so loads are managed according to their priority. In proposed system, the graphical user interface (GUI) view will be used to monitor and control appliances status, power consumption and to calculate the instantaneous cost. Hardware results indicate the effectiveness of the proposed DSM algorithm.

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2017

S. M. Sam and T. S. Angel, “Performance optimization of PID controllers using fuzzy logic”, in 2017 IEEE International Conference on Smart Technologies and Management for Computing, Communication, Controls, Energy and Materials (ICSTM), Chennai, India, 2017.[Abstract]


The controllers extensively used in the control industry are of the PID type. The performance of these controllers depends on the values of the Proportional, Integral and Derivative, (P, I and D) parameters. Tuning of these parameters is a tedious task which requires experience and expert knowledge of the calibration engineer. This paper proposes a fine tuning method for these parameters using fuzzy logic. The PID Controller is initially tuned using Ziegler Nichols Closed Loop method and Relay auto tuning and then finely tuned using fuzzy logic. The output response is drastically improved when fuzzy logic is used for fine tuning and the results validating the same are simulated using MATLAB/Simulink.

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2017

A. S. Neethu and T. S. Angel, “Smart fault location and fault classification in transmission line”, in 2017 IEEE International Conference on Smart Technologies and Management for Computing, Communication, Controls, Energy and Materials (ICSTM), 2017.[Abstract]


Transmission lines are the essential link between power stations and consumers, which carries bulk amount of power to the required premises. So protection of transmission lines become more predominant and need exact fault location on transmission line. This paper presents a better way for finding fault location using discrete wavelet transform (DWT) and artificial neural network (ANN) and one algorithm is developed for finding the type of fault using wavelet transform. The simulation is carried out using MATLAB software.

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2017

N. Balakrishnan, T. S. Angel, and Lekshmi R. Chandran, “PV-battery system for smart green building using transformer coupled DC-DC converter”, in 1st IEEE International Conference on Power Electronics, Intelligent Control and Energy Systems, ICPEICES 2016, 2017.[Abstract]


Power from Solar is absolutely perfect for use with irrigation systems for gardens; allotments; greenhouses and also for supporting the main grid. Since the power generation of PV system is highly depends upon the environmental conditions such as availability of sunlight; atmospheric temperature; wind speed etc. Combining a storage device with PV is one of the viable solutions to deal with the intermittency of renewable energy sources. Conventional methods of combining these components involve multistage converters and single-stage converters. The no of stages and switches increases the overall efficiency of the system decreases. In the conventional system an individual converter is used for maximum power point tracking and also a battery charge controller. These two individual converters are not used in every time. Transformer coupled dual input DC-DC converter is discussed in the system which integrates both the MPPT and battery charging discharging control. A coordinated control is used for making the system to work in four different modes of operation and there by satisfying the efficient MPPT and battery current tracking. The system is simulated and studied under various conditions in MATLAB/Simulink platform. © 2016 IEEE. More »»

2016

J. G. Tharakan and T. S. Angel, “Improved control technique of an active magnetic bearing subjected to voltage saturation”, in proc. of International Conference on Advancements in Automation, Robotics and Sensing (ICAARS 2016), PSG college of technology, Coimbatore , 2016.

2015

S. Aneesh and T. S. Angel, “Quadrilateral relay based distance protection scheme for transmission lines under varying system conditions”, in Proceedings of IEEE International Conference on Technological Advancements in Power and Energy, TAP Energy 2015, 2015, pp. 35-39.[Abstract]


Quadrilateral relay provides flexible protection during high fault resistance of ground and phase faults. This is advantageous for protection of phase-to-earth faults on short lines, non-effectively earthed systems and feeders with extremely high tower footing resistance. It also provides fault impedance coverage for both phase to phase and phase to ground faults. The proposed work intends the development of a numerical quadrilateral distance relay that can retain its function even under a major change in system configuration. The proposed relaying scheme is analyzed by coding the relay logic and simulating the system with transmission network in MATLAB/Simulink. Different factors influencing the performance of quadrilateral relay are studied and verified. It is observed that the scheme is adaptive to the system variations and mal trips are reduced. © 2015 IEEE.

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2015

Aa Rajeev, T. S. Angel, and Khan, F. Zb, “Fault location in distribution feeders with optimally placed PMU's”, in Proceedings of IEEE International Conference on Technological Advancements in Power and Energy, TAP Energy 2015, 2015, pp. 438-442.[Abstract]


Instrumenting power networks with phasor measurement units (PMUs) facilitates several tasks including optimum power flow, system control, contingency analysis, fault detection etc. For the above purposes, PMU's are not required to place in all the bus in a power system. Also because of higher cost, optimal placement of PMU's are done by using the binary search algorithm. The algorithm for optimal placement is tested for a 7 bus and standard IEEE 14 & 30 bus systems. Once the PMU's are placed optimally, the next step involved is the fault location and diagnosis scheme which is capable of accurately identifying the location of a fault upon its occurrence. The proposed fault location method can be used to identify the fault in both ring and radial type distribution feeders. This scheme consists of three independent steps which are running parallel to obtain the exact location of the fault. The proposed algorithm is tested for eight different faults in an 11 bus radial test system and a 14 bus ring system. © 2015 IEEE.

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2015

A. Rajeev and T. S. Angel, “Optimally Placed PMU's for Fault Detection in Distribution Networks”, in Proc. of IEEE international conference on Electrical, Electronics, Signals, Communication and Optimization (EESCO) , -2015 , VIT Vishakapatnam, 2015.

2014

U. M and T. S. Angel, “Interfacing of permanent magnet synchronous generator wind energy system to gridusing a solid state transformer”, in proc.of International Conference on Computing of Power, Energy & Communication- ICCPEIC -2014, Adhiparasakthi Engineering College, Melmaruvathur, kanchipuramdt, 2014.

2014

T. S. Angel, “Interfacing of Permanent Magnet Synchronous Wind energy System to grid using a solid state transformer”, 2014.

2013

N. G. Nayana and T. S. Angel, “Soft switching Techniques for high voltage gain in Asymmetrical full bridge converter”, in Proceedings of National Conference on Technological Advancements in Power and Energy, 2013.[Abstract]


This paper explore the techniques of Asymmetrical full bridge converter with high voltage gain. It achieved zero voltage switching of all power switches, zero current switching of output diodes. Prototype of the converter is developed, experimented and validated using the asymmetrical pulse width modulation techniques. The proposed converter achieved a gain of 12 with zero switching losses, no conduction losses and a fixed switching frequency.

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2013

A. Sudhakaran and T. S. Angel, “Permanent magnet synchronous wind generator for microgrid dynamic performance improvement”, in 2013 Annual International Conference on Emerging Research Areas, AICERA 2013 and 2013 International Conference on Microelectronics, Communications and Renewable Energy, ICMiCR 2013 - Proceedings, Kerala, 2013.[Abstract]


Microgrids (MGs) and Distributed Generation are becoming a significant area of research because of their peculiar distinctiveness. Microgrids are composed of generating sources which can be renewable, placed near the customer side. Also, they have the intrinsic property of islanding i.e. the disconnection of either the MG from the main grid or a part of the MG from the rest of the MG. In this paper, the behavior of a MG during grid connected and islanded operation is investigated. A control approach is proposed in this paper to be applied on a PMSG, for providing both voltage and frequency regulation capabilities, and thereby to provide an improvement in the dynamic behavior of a microgrid system. Also a pitch angle control strategy and a switch mode control strategy with MPPT have been implemented. The MATLAB/SIMULINK software is used to develop the simulation model. © 2013 IEEE.

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2012

T. S. Angel, and S andBindu, “Back up Wide Area Protection Techniques for Power Transmission Grids using PMU”, in National Conference on Technological Trends (NCTT), , CET, Trivandrum, 2012.

2012

T. S. Angel, “Back up wide area protection technique for power transmission grid using PMU”, in National Conference Paper, 2012.

Publication Type: Journal Article

Year of Publication Title

2019

T. S. Angel, A.S., N., V., R. P., and P., K., “WT and ANN based smart fault location for interconnected power transmission grids”, Compusoft, An International Journal of Advanced Computer Technology, vol. (, no. 2, pp. 3042-3046, 2019.[Abstract]


Transmission lines which carries bulk amount of power from generating units to the end users are more prone to fault, since they exposed to atmosphere. Thus the protections of transmission lines are vital in maintaining the continuity in services, and to reduce its impact on rest of the power system. Locating the fault in an interconnected power system is necessary to ensure good selectivity in the protection scheme. This paper proposes a smart approach for locating the fault in interconnected power transmission grids with the help of discrete wavelet transform (DWT) and artificial neural network (ANN), the combined use of WT and ANN ensures an adaptive and accurate scheme for locating the fault. The proposed algorithm is analyzed and validated on a nine bus system using MATLAB/Simulink software.

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2014

T. S. Angel and S., S., “Soft Computing Technique for online monitoring of voltage stability margin of a wind penetrated power system”, World Academy of Science Engineering and Technology, February 21st 2014, vol. 1, 2014.

Publication Type: Conference Proceedings

Year of Publication Title

2019

AnirudhVijay, T. S. Angel, and Lokesha, D., “Energy Reserve Management in Automobile Airbag Control Unit”, Proceedings of the 4th IEEE International Conference on Recent Trends on Electronics, Information, Communication and Technology, RTEICT 2019. pp. 1262-1269, 2019.[Abstract]


Energy management in electric vehicles is one prominent aspect in terms of enhancing mileage and economy. Airbag Control Units (ACUs) are ECUs (Electronic Control Units) which decide on the deployment of airbags by processing the information (crash input) from peripheral and internal sensors in the scenario of an unavoidable crash. The energy reserve capacitors used in the ACU (Airbag Control Unit) are provided so that once a crash event occurs and Loss of Battery (LOB) occurs in turn, the airbags can still be powered with their help as an emergency supply system. The disadvantage of limited time availability of the ERC as a power source makes it defective in cases of delayed deployment needs. These needs are cases which are further discussed in the introduction. This work is intended to research on a novel algorithm which coordinates between three alternative power sources, namely the main battery, ERC and a backup battery, to make the system more compatible to various unattended crash scenarios and in systems which utilize manual input as determining factor for deployment loops. Another parallel objective of this work resides in the application and analysis of fuzzy-logic based crash classification for enhanced performance and speed. © 2019 IEEE.

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2013

S. Aryamol and T. S. Angel, “Power Quality Enhancement of a Grid Connected Wind PMSG Using a STATCOM- Control Scheme”, National Conference on Technological Advancements in Power & Energy. pp. 65-69, 2013.[Abstract]


Supplementing wind power into an electric grid affects the power quality. The influence of the wind turbine in the grid system concerning the power quality measurements are the active power, reactive power, voltage variation, harmonics, flicker and electrical behaviour of switching operation and these are measured according to national/international guidelines. This paper demonstrates the power quality issues due to installation of wind turbine with permanent magnet synchronous generator (PMSG) to the grid. A STATCOM is connected at the point of common coupling with a battery energy storage system (BESS) to alleviate the power quality issues. The STATCOM control scheme for the grid connected wind energy generation system for power quality improvement is simulated using MATLAB/Simulink. The simulation results show that the STATCOM provides reactive power support to the load and the power factor at the source side is maintained at unity.

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