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www.stmjournals.comSTM JOURNALSScientific Technical Medical
Journal of
Jan - April 2014
ISSN: 2321-4244
Power Electronics & Power Systems
JoPEPS
conducted
üDesign Parameters Of Three-phase Self-excited Induction Generator For
Desired Performance Under Unbalanced Operations
üDirect Power Control Of Brushless Dc Motor Drive
üImplementation Of Real Time Pricing In Deregulated Power Sector
üThe Transient Response And Frequency Characteristics Of Power Transformers
Having Non-uniform Winding Insulation
üVoice based Control of Appliances using LabVIEW
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Journal of Power Electronics & Power Systems
Journal of Power Electronics & Power Systems
(ISSN: 2321– 4244)
?Power Transmission, Distribution and Generation
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I take the privilege to present the hard copy compilation for the [Volume 4 Issue (1)] of Journal of
Power Electronics & Power Systems. The intension of JoPEPS is to create an atmosphere that
stimulates creativeness, research and growth in the area of Journal of Power Electronics & Power
Systems.
The development and growth of the mankind is the consequence of brilliant Research done by
eminent Scientists and Engineers in every field. JoPEPS provides an outlet for Research findings
and reviews in areas of Power Electronics & Power Systems found to be relevant for National and
International recent developments & research initiative.
The aim and scope of the Journal is to provide an academic medium and an important reference for
the advancement and dissemination of Research results that support high level learning, teaching and
research in the domain of Power Electronics & Power Systems.
Finally, I express my sincere gratitude and thanks to our Editorial/ Reviewer board and Authors for
their continued support and invaluable contributions and suggestions in the form of authoring write-
ups/ reviewing and providing constructive comments for the advancement of the journals. With
regards to their due continuous support and co-operation, we have been able to publish quality
Research/Reviews findings for our customers base.
I hope you will enjoy reading this issue and we welcome your feedback on any aspect of the Journal.
Dr. Archana Mehrotra
Director
STM Journals
Director's Desk
STM JOURNALS
1. Design Parameters of Three-phase Self-excited Induction Generator for Desired Performance under Unbalanced Operations Yatender Chaturvedi, Kanwarjit Singh Sandhu 1
2. Direct Power Control of Brushless DC Motor Drive Abolfazl Halvaei Niasar, Mozhgan Behzadi Shahrbabak 13
3. Implementation of Real Time Pricing in Deregulated Power SectorVed Parkash, Yog Raj Sood 25
4. The Transient Response and Frequency Characteristics of Power Transformers having Non-uniform Winding InsulationMohamed M. Saied 37
5. Voice based Control of Appliances using LabVIEWJ.E Arthi, M. Jagadeeswari 53
ContentsJournal of Power Electronics & Power Systems
JoPEPS (2014) © STM Journals 2014. All Rights Reserved
Journal of Power Electronics & Power Systems ISSN: 2321-4244
Volume 4 Issue 1
www.stmjournals.com
Design Parameters of Three-phase Self-excited Induction
Generator for Desired Performance under
Unbalanced Operations
Yatender Chaturvedi*, Kanwarjit Singh Sandhu
Department of Electrical Engineering, National Institute of Technology, Kurukshetra, India
Abstract Self-excited induction generators are widely used for power generation using wind
energy in remote and windy locations. However, the load in such generating units may
become unbalance and sometimes the excitation capacitance may be unbalance due to
aging effect or manufacturing tolerance. All this reflect a strong need for the analysis of such machines under unbalanced operations. In this paper, proposed model as presented
has been framed in order to decide the design parameters of SEIG for desired
performance under unbalanced load and excitation as well. The simulation results on 15 kw machine have been used to frame the recommendations.
Keywords: Self-excited induction generator (SEIG), wind energy, unbalanced
operation, degree of unbalance, renewable energy
JoPEPS (2014) © STM Journals 2014. All Rights Reserved
Journal of Power Electronics & Power Systems ISSN: 2321-4244
Volume 4 Issue 1
www.stmjournals.com
Direct Power Control of Brushless DC Motor Drive
Abolfazl Halvaei Niasar*, Mozhgan Behzadi Shahrbabak
Faculty of Electrical & Computer Engineering, University of Kashan, Kashan,
P.O.Box: 87317-51167, Iran
Abstract Recently, due to significant increase in demands of electric motors, design and
manufacturing of high efficiency motors and related variable speed drives have been
regarded by many suppliers. Among several kinds of motors, the brushless DC (BLDC) motor has many advantages including high torque capability. In this paper, for the first
time, the possibilities of direct power control (DPC) of BLDC motors fed by a voltage
source inverter have been studied. Principles of this method have been separately
evaluated. The BLDC motor has been driven with three control method. The results show
that the DPC technique enjoys all advantages of pervious method such as fast dynamic and ease of implementation, without having the previous method problems. The Simulations
were carried out for the closed-loop speed control systems under various load conditions to
verify the proposed methods. A modified DPC method with 12 sectors is presented to improve the performance of the direct power control method for BLDC motor drive.
Theoretical analysis and performance of the developed controller is confirmed via simulation at different speed and under various disturbances.
Keywords: Direct power control (DPC), brushless DC motor (BLDCM), hysteresis
control, automotive, drive
*Author for Correspondence E-mail: [email protected]
JoPEPS (2014) © STM Journals 2014. All Rights Reserved
Journal of Power Electronics & Power Systems ISSN: 2321-4244
Volume 4 Issue 1
www.stmjournals.com
Implementation of Real Time Pricing in
Deregulated Power Sector
Ved Parkash1*, Yog Raj Sood
2
1NIT Hamirpur, Himachal Pradesh, India
2Electrical Department NIT Hamirpur, Himachal Pradesh, India
Abstract This paper proposes an approach for implementation of Real Time Pricing in deregulated power sector. In this paper, combined model consisting of the pool,
bilateral and multilateral transaction of deregulated power sector has been considered.
In deregulated power sector, power schedule is decided 24 h ahead of real market but
some of the market participants are diverted from their commitments regarding either
supply of scheduled generation or withdrawal of scheduled demand from the pool. Due to these reasons, the power system deviates from the optimized solutions. So there is an
urgent need for implementation of real time pricing for unscheduled interchange
revenue paid by such defaulter market participants. In this paper, frequency based technique has been implemented for determination of unscheduled interchange revenue
paid by such defaulter market participants. The whole transmission system has been divided into three sections; prevailing frequency in these regions can be assumed due
to unscheduled interchange occurring in the system. In this paper, real time pricing has
been implementation to generalized deregulated model.
Keywords: Availability based tariff, deregulated power sector, independent
system operator, unscheduled interchange, central electricity regulatory
commission, locational marginal price
© STM Journals 2014. All Rights Reserved (2014)JoPEPS
Journal of Power Electronics & Power Systems ISSN: 2321-4244
Volume 4, Issue 1
www.stmjournals.com
The Transient Response and Frequency Characteristics
of Power Transformers having Non-uniform
Winding Insulation
Mohamed M. Saied* Independent Researcher, Giza, Cairo, Egypt
Abstract This paper presents a Laplace-domain distributed-parameter technique for analyzing the
transient and frequency response of power transformers having non-uniform winding
insulation. Stronger winding insulation near the windings source side terminals is
usually applied in order to mitigate the concentration of the transient voltage stresses
close to these locations. This will result in a location-dependent inter-turn capacitance distribution. The suggested procedure for analyzing such windings is based on the
cascade connection of several equivalent two-ports. The s-domain expressions for the
corresponding surge impedances and propagation constants for the different sections will therefore be location-dependent. Analytical closed-form expressions for the complex
input impedance as well as the voltage and current distributions along the different winding sections could then be obtained. The windings series and parallel resonance
frequencies and the corresponding impedance values can then be easily found. Applying
numerical Laplace inversion, the windings response to any applied voltage or current stimuli is also computed. Furthermore, the presented method can identify the locations of
excessive voltage or current stress concentrations along the winding and the way they are affected by the non-uniformity of the capacitance distribution. The result of detailed
parameter study has been presented in order to demonstrate the effect of both the non-
uniform capacitance distribution and of the transformers neutral treatment on the windings frequency and transient responses. In particular, the visualization of the
modified locations and magnitudes of the overstresses as well as the changes in their
resonance frequencies are also discussed. The effect of the windings copper and insulation losses and of the source internal resistance on the computation accuracy is
also addressed.
Keywords: Power transformer, equivalent circuit, power system transients,
simulation, transformer winding, distributed parameters, voltage distribution,
high-frequency model, non-uniform insulation
JoPEPS (2014)© STM Journals 2014. All Rights Reserved
Journal of Power Electronics & Power Systems ISSN: 2321-4244
Volume 4 Issue 1
www.stmjournals.com
Voice based Control of Appliances using LabVIEW
J.E Arthi1*, M. Jagadeeswari
2
1P.G Scholar, Department of Electrical and Electronics Engineering [P.G] Power Electronics and
Drives, Sri Ramakrishna Engineering College, India 2Professor & Head, Department of Electronics and Communication Engineering [P.G] VLSI,
Sri Ramakrishna Engineering College, India
Abstract A voice based control of appliances for home and office automation become increasingly important and interesting. Automation with the voice provides better time management.
These also improve the quality of our lives by automating some of the electrical home appliances such as light source, A/V equipment, computer, security device, etc. In this
paper a voice based control of devices using LabVIEW is implemented. User can input
the control command through the head phone. Different frequencies are assigned to the device when the spoken command matches with that frequency the device responds.
LabVIEW is used to process and recognize the voice signal then the signals is used to send commands to the control unit to control a wide range of mains appliances in homes
and offices.
Keywords: Automation, voice control, frequency matching, LabVIEW