Qualification: 
M.Tech
mini_sujith@blr.amrita.edu

Mini Sujith currently serves as Vice Chairperson and Assistant Professor(S.G) at the Department of Electrical and Electronics Engineering, Amrita School of Engineering, Bengaluru Campus. She joined Amrita, Bengaluru Campus in 2002 and has 9 years of Industrial Experience. She is currently pursuing Ph.D. in Electrical Drives and Control. She is a member of Institute of Electrical and Electronics Engineers(IEEE) and IEEE Power Electronics Society and currently serves as adviser for IEEE-PELS student branch at Amrita, Bengaluru Campus.

Education

YEAR DEGREE/PROGRAM INSTITUTION
Registered in  the year-2012 Ph.D(Pursuing) R.V College of Engineering, Bangalore, Visvesvaraya Tecnological University(VTU)
2006-2008 M.Tech-Power Electronics R.V College of Engineering, Bangalore, Visvesvaraya Tecnological University(VTU)
1998 Advanced Diploma in Software Exports Technologies Asset International certified Computer Courses, APTECH Ltd
1988 B.Tech - Electrical Engineering T.K.M College of Engineering, Kollam, Kerala University

Publications

Publication Type: Journal Article

Year of Publication Publication Type Title

2016

Journal Article

Mini Sujith, Joshi, M., B. Satheesh, H., and N, D. M., “Active LC Clamp dv/dt Filter for Voltage Reflection due to Long Cable in Induction Motor Drives ”, International Journal of Electrical and Computer Engineering (IJECE) , vol. 6, pp. 1456 - 1469 , 2016.[Abstract]


This paper presents an active LC clamped dv/dt filter to mitigate the over voltages appearing across the motor terminals. The over voltages at motor terminal is due to voltage reflection effect of long motor cable connected between high frequency PWM inverter having high dv/dt switching waveforms and ac motor drives. The voltage reflection due to fast switching transients can be reduced by increasing the rise time and fall time of inverter output voltage pulses. The most commonly available mitigating technique is a passive dv/dt filter between inverter and cable. Since, size, cost and losses of passive LC dv/dt filter is more, an active dv/dt filtering technique is used to reduce over voltage at motor terminals. Active LC clamp filtering technique used here consists of a small LC filter designed for a single motor cable length which can be used for any lengths of cable up to 1000m only by changing the active control of the PWM pulses to achieve the desired voltage slope during voltage transition period. The basic principle of active dv/dt filer used here is to charge and discharge the capacitor in the filter with modified PWM pulses to increase the rise time and fall time of output voltage pulses without any extra devices to handle the transient response of the LC filter. Detailed investigation is carried out by simulation using MATLAB-Simulink software with active control of common LC clamp dv/dt filter suitable for various cable lengths ranging from 100 m to 1000 m. Comparative analysis is done with active dv/dt filter designed with a common LC clamp filter and active LC clamp dv/dt filter designed for various cable lengths and also with diode clamped passive dv/dt filter. The results proves the effectiveness of the active common LC dv/dt filter to mitigate the over voltages at motor terminal for cable lengths up to 1000m. More »»

2015

Journal Article

Mini Sujith, Backer, S., Satheesh, B. H., and M.N, D., “MRAS Speed Observer for Low Speed Estimation in Sensorless DTC-SVM Induction Motor Drives”, International Journal of Applied Engineering Research , vol. 10, no. 17, pp. 37751-37757, 2015.

2015

Journal Article

Mini Sujith, Saranya, C., B Satheesh, H., and Dinesh, M. N., “Low Speed Estimation in Sensorless Direct Torque Controlled Induction Motor Drive using Extended Kalman Filter”, International Journal of Power Electronics and Drive Systems, vol. 6, 2015.[Abstract]


Sensorless Direct Torque Control (DTC) is a powerful control scheme for high performance control of induction motor (IM) drives, which provides very quick dynamic response with simple structure and a decoupled control of torque and flux. The performance of the DTC drive greatly depends on the accuracy of the estimated flux components, torque and speed, using monitored stator voltages and currents. Low speed estimation is a great challenge because of the presence of transient offset, drift and domination of ohmic voltage drop. Extended Kalman filter (EKF) is a non linear adaptive filter which performs the process of finding the best estimate from the noisy data based on state space technique and recursive algorithm. This paper mainly focuses on the accurate estimation of speed ranging from very low speed to rated speed using the equation of motion. A new state space model of the IM is developed for estimation in EKF, with load torque as an input variable and not as an estimated quantity which is the case in most previous studies. The developed algorithm is validated using MATLAB-Simulink platform for speeds ranging from low speed to rated speed at rated torque and at various torque conditions. An exhaustive analysis is carried out to validate the performance of DTC Induction motor drive especially at the low speeds. The results are promising for accurate estimation of speed ranging from low speed to rated speed using EKF. More »»

Publication Type: Conference Paper

Year of Publication Publication Type Title

2014

Conference Paper

Mini Sujith, ,, and Dinesh, M. N., “LC Clamp Filter for Voltage Reflection due to Long Cable in Induction Motor Drives”, in Emerging Research Areas: Magnetics, Machines and Drives (AICERA/iCMMD), 2014 Annual International Conference on, 2014.[Abstract]


In many industrial applications, Pulse Width Modulated (PWM) inverter-fed induction motors needs long cables. The PWM inverter output voltage pulses behave like
travelling waves on these cables. This phenomenon causes voltage reflection that results in over voltage at the motor terminals. Over voltage at the terminals of the motor is attributed by the rise time of the inverter pulses, length of the power cable that connects the inverter

More »»

2014

Conference Paper

Mini Sujith, Sreenivasan, R., and Dinesh, M. N., “Low Speed Estimation of DTC Controlled Induction Motor Drive Using MRAS”, in Electronics, Communication and Computational Engineering (ICECCE), 2014 International Conference on, 2014.[Abstract]


Direct Torque controlled (DTC) induction motor drive gives direct control of stator flux and electromagnetic torque. Conventional speed sensors are replaced in sensor less DTC to improve the reliability, noise immunity and to reduce the complexity of the system. In sensor less DTC the rotor speed estimation at low speeds is degraded by the stator resistance parameter variations due to temperature, dead time effects and voltage drop.

More »»

2014

Conference Paper

V. Vijayan, Mini Sujith, and Manjunath, H. V., “Analysis and Implementation of a High Boost DC-DC Converter for Renewable Energy Power Systems”, in Emerging Research Areas: Magnetics, Machines and Drives (AICERA/iCMMD), 2014 Annual International Conference on, 2014.[Abstract]


A high conversion ratio dc-dc converter suitable for renewable energy applications has been investigated and presented here. A high-boost dc-dc converter is designed with high voltage conversion ratio for fuel cell or photovoltaic systems. The proposed system consists of a current-fed half bride at the input side, an active-clamp circuit and an output voltage-doubler with three stages of boosting operations.

More »»

2014

Conference Paper

Mini Sujith, Anu, K. M., and Dinesh, M. N., “HFSI—A Promising Solution to Very Low Speed Issues in DTC-SVM Induction Motor Drive”, in Emerging Research Areas: Magnetics, Machines and Drives (AICERA/iCMMD), 2014 Annual International Conference on, 2014.[Abstract]


The stator flux and electromagnetic torque are directly controlled in a DTC system using space vector modulation technique. In DTC, torque and flux ripples increases at low speeds. A DTC-SVM induction motor drive at very low speeds is investigated here and High Frequency Signal Injection (HFSI) method is adopted to mitigate the low speed issues. In this method a sinusoidal wave of small amplitude and high frequency is injected.

More »»
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