Journal of power electronics & power systems(vol4, issue1) by STM Journals Publication

JoPEPS Journal of

Power Electronics & Power Systems

ISSN: 2321-4244 Jan - April 2014

üDesign Parameters Of Three-phase Self-excited Induction Generator For conducted

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 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 writeups/ 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.

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Journal of Power Electronics & Power Systems

Contents

1. Design Parameters of Three-phase Self-excited Induction Generator for Desired Performance under Unbalanced Operations Yatender Chaturvedi, Kanwarjit Singh Sandhu

2. Direct Power Control of Brushless DC Motor Drive Abolfazl Halvaei Niasar, Mozhgan Behzadi Shahrbabak

3. Implementation of Real Time Pricing in Deregulated Power Sector Ved Parkash, Yog Raj Sood

4. The Transient Response and Frequency Characteristics of Power Transformers having Non-uniform Winding Insulation Mohamed M. Saied

5. Voice based Control of Appliances using LabVIEW J.E Arthi, M. Jagadeeswari

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

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

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 Sood2 1

NIT Hamirpur, Himachal Pradesh, India Electrical 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

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 nonuniform 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

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. Jagadeeswari2 1

P.G Scholar, Department of Electrical and Electronics Engineering [P.G] Power Electronics and Drives, Sri Ramakrishna Engineering College, India 2 Professor & 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