Ms. Preetha PK currently serves as Assistant Professor (Sel. Gr.) and Vice Chairperson at the Department of Electrical and Electronics Engineering at Amrita School of Engineering, Amritapuri. Ms. Preetha has completed  B.Tech in Electrical & Electronics Engineering and M.Tech. in Power Systems from College of Engineering, Trivandrum in the year 1995 and 1997 respectively. She is currently pursuing her Ph.D. at the department of Electrical and Electronics Engineering, Amritapuri campus of Amrita University

Ms. Preetha joined the department in 2007. Prior to coming to Amrita, she was a faculty at Fr. Conceicavo Rodrigues Institute of Technology, Navi Mumbai from 1999 to 2007. From 1998-1999 she was with the department of Electrical & Electronics Engineering,Kumaraguru College of Technology, Coimabatore. 

Ms. Preetha is a member of IEEE and a life time member of ISTE.  She was conferred with the Certificate of Appreciation for her achievements during the academic year 2014-2015 from Amrita Vishwa Vidyapeetham, Amritapuri. 



Publication Type: Conference Paper
Year of Conference Publication Type Title
2015 Conference Paper P. K. Preetha, “Power Factor correction circuit with One Cycle Controlled bridgeless zeta converter for display monitors in hospitals”, in TENCON 2015 - 2015 IEEE Region 10 Conference, Holiday Inn, Sands Cotai Central Macao SAR, China, 2015.[Abstract]

Development in the field of electrical engineering is quick and commendable. Even though the nonlinear power electronic equipments introduce power quality issues, their use is unavoidable. Most of the medical equipments make use of power electronic devices. Serious issues include low input power factor and increased ripples in the input current. Many bridgeless topologies have been introduced to mitigate the above mentioned problems. Common topologies make use of buck, boost, Cuk and Sepic converters. In this paper bridgeless zeta converter with one cycle control for display monitors in hospitals has been proposed. With one cycle control, input perturbations are avoided in one switching cycle. The converter is designed to supply the load of 50W and 24V. MATLAB/Simulink model has been analyzed for various conditions. A laboratory prototype of the converter has also been made and tested for the designed values. Results of simulation have been verified with the hardware system. Power factor has been observed to be above 0.97.

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2015 Conference Paper P. K. Preetha, “Analysis of star-star-delta_utilized transformer under balanced and unbalanced load conditions”, in IEEE IAS Conference 2015 at Annual meeting'15, Dallas, Texas, 2015.
2015 Conference Paper P. K. Preetha, “Comparison of PWM AND modified one cycle control for bridgeless zeta ac-dc converter”, in IEEE International Conference on Power and Advanced Control Engineering, Bangalore, 2015.
2015 Conference Paper P. K. Preetha, “Electromagnetic Analysis of Transformer using SOLIDWORKS”, in IEEE International Conference on Technological Advancvements in Power & Energy, TAP Energy 2015, Amrita ViswaVidyapeetham, India, 2015.
2015 Conference Paper P. K. Preetha, “STATCOM based control scheme for power quality improvement”, in International Conference on Recent Innovations in Engineering and Technology, Travancore College of Engineering, 2015.
2015 Conference Paper P. K. Preetha, “Power Quality Improvement using FC-TCR with closed loop control”, in International Conference on Recent Innovations in Engineering and Technology, Travancore College of Engineering, 2015.
2015 Conference Paper P. K. Preetha, Jacob, S., and Nair, P. S. C., “An equivalent circuit model for star-star-delta-utilized distribution transformer”, in IEEE Region 10 Annual International Conference, Proceedings/TENCON, 2015, vol. 2015-January.[Abstract]

In the recent years there has been excessive use of nonlinear loads in power distribution network resulting in the injection of harmonics into the utility power system. The triplen harmonics due to non-linear loads circulate in the conventional delta-star distribution transformer resulting in excessive power losses. Star-star-delta-utilized transformer is a modified distribution transformer configuration suggested recently which helps in recovering and utilizing the power wasted due to circulating harmonics in the transformer delta winding. This is achieved by connecting a load across the zero potential terminals of the tertiary delta winding of the transformer. This paper presents a three phase equivalent circuit model for the star-star-delta-utilized transformer. The proposed dependent source model is simulated and compared with the performance of the available transformer model of MATLAB Simulink. The results show that at steady state the performance of the proposed model can replicate the performance of the Simulink model. © 2014 IEEE.

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2014 Conference Paper P. K. Preetha, “Dependent source equivalent circuit model of Star-Star-Delta_Utilized distribution transformer”, in IEEE TENCON, Bangkok, Thailand, 2014.
2014 Conference Paper P. K. Preetha, Sana, A., Anusha, B., P, K., P.V, N. Azeez, Nair, D. Manjula G., and K.R., A., “Solar LED Street Light With Brightness Control”, in Second National Conference on Power Electronics in Sustainable Energy Development(NCPE2014), Amrita VishwaVidyapeetham, Coimbatore, 2014.
2013 Conference Paper P. K. Preetha, “Effects of drainage power recovery on power quality”, in National Conference on Technological Advancements in Power & Energy (TAP Energy 2013, 2013.
2011 Conference Paper P. K. Preetha, “A novel method for recovery of drainage power from distribution transformers”, in IEEE PES International Conference on Innovative Smart Grid Technologies (ISGT 2011), 2011.
2007 Conference Paper P. K. Preetha, “PLC based Master Controller for Wound Rotor Induction Motor”, in National conference organized by Fr.C.R.C.E, Mumbai, 2007.
Publication Type: Journal Article
Year of Conference Publication Type Title
2014 Journal Article P. K. Preetha and Nair, P. S. Chandra, “Drainage Power Recovery from Distribution Transformers”, Hydel Technical Journal of KSEB Engineer’s Association (KSEBEA), vol. 60, pp. 27-30, 2014.
Publication Type: Conference Proceedings
Year of Conference Publication Type Title
1997 Conference Proceedings P. K. Preetha, “Synchronous Voltage Source (SVS) for Dynamic Compensation of AC Transmission Systems”, 2nd National Seminar on Modern Trends in Power Engg& Development conducted by KSEB & published subsequently in the proceedings of the Seminar. 1997.
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