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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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

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Systems.

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I hope you will enjoy reading this issue and we welcome your feedback on any aspect of the Journal.

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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: halvaei@kashanu.ac.ir

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