Journal of power electronics & power systems (vol4, issue2) by STM Journals Publication

ISSN: 2321-4244

JoPEPS

Journal of Power Electronics & Power Systems

May-August 2014

üDesign and Simulation of IRFOC üMitigation of Flicker & Harmonics in Grid Connected DFIG üSingle-Input Fuzzy Logic Controllers for Separately Excited DC Motor üTime and Frequency Response of Transformer Windings üControl of Induction Motor Drive üEvaluation of Reliability in Five-Phase Induction Motor

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I take the privilege to present the hard copy compilation for the [Volume 4 Issue (2)] 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 and Simulation of IRFOC for SPWM Inverter-fed Induction Motor Considering Core Loss and Stray Load Loss Mohammad Abdul Mannan, Md. Ehtashamul Haque, Rupak Kanti Dhar

2. Mitigation of Flicker and Harmonics in Grid Connected DFIG for Power Quality Improvement Sanjeev Kumar Bhalla, R. K. Jarial, Y.R. Sood

3. Single-Input Fuzzy Logic Controllers for Efficiency Maximized Separately Excited DC Motor Mohammad Abdul Mannan, Toshiaki Murata, Junji Tamura

4. The Time and Frequency Response of Shielded Transformer Windings Mohamed M. Saied

5. Direct Power Control of Induction Motor Drive Abolfazl Halvaei Niasar, Hossein Rahimi Khoei

6. Evaluation of Reliability in Five-Phase Induction Motor Operated at Low Speed by V/F Control Method using FPGA Manjesh

Journal of Power Electronics and Power Systems ISSN: 2249-863X(online), ISSN: 2321-4244(print) Volume 4, Issue 2 www.stmjournals.com

Design and Simulation of IRFOC for SPWM Inverter-fed Induction Motor Considering Core Loss and Stray Load Loss Mohammad Abdul Mannan, Md. Ehtashamul Haque*, Rupak Kanti Dhar Department of Electrical and Electronic Engineering, American International University-Bangladesh, Kemal Ataturk Avenue, Banani, Dhaka-1213, Bangladesh Abstract The principle of field oriented control (FOC) or vector control (VC) of induction motors (IMs) is based on the control of both the magnitude and the phase of each phase current and voltage to achieve the decoupling control strategies between flux and torque. To control the flux and the torque precisely based on the FOC, core losses (CL) and stray load losses (SLL), which are generally neglected, should be considered in the mathematical model of IM to design the controller. In order to achieve the precise flux and torque control of IM, some of literatures have proposed to detuning method for FOC of IM to compensate the effects of CL and SLL. But it has seen that the mathematical modeling of detuning process is very complex which makes the complexity in the case of implementation also. In this paper, a novel FOC of IM with consideration of both CL and SLL is proposed. In this novel FOC of IM includes the decoupling control strategy which is easier than the detuning strategy. The effectiveness of proposed FOC of IM considering CL and SLL has been verified by the simulation work which has been done by using Matlab/Simulink. The simulation results show that the speed control with decoupling of flux and torque control for high performance of IM with considering CL and SLL based the proposed FOC can be achieved.

Keywords: Induction motor, Core loss, Stray Load loss, Field-oriented control, PI controller

Journal of Power Electronics and Power Systems ISSN: 2249-863X(online), ISSN: 2321-4244(print) Volume 4, Issue 2 www.stmjournals.com

Mitigation of Flicker and Harmonics in Grid Connected DFIG for Power Quality Improvement Sanjeev Kumar Bhalla1*, R. K. Jarial2, Y.R. Sood2 1

School of Electronics & Electrical Engineering, Lovely Professional University, Phagwara, Punjab, India 2 Department of Electrical Engineering, National Institute of Technology, Hamirpur, India

Abstract This paper focuses on the mitigation of voltage harmonics and flicker of a grid connected doubly fed induction generator for wind energy conversion system. The harmonics have been mitigated by an active series filter and flicker levels have been minimized by optimal control of wind turbine output reactive power. The effectiveness of the proposed mitigation strategies has been analyzed for various grid conditions and different wind speeds. The flicker levels and voltage harmonics have been successfully reduced as per prescribed standards. The proposed system thus ensures that voltage impurity is not passed on to the grid and high power quality is maintained.

Keywords: Doubly Fed Induction Generator (DFIG), Wind Energy Conversion Systems (WECS), Power Quality (PQ), Active Series Filter (ASF), Pulse Width Modulation (PWM), Point of Common Coupling (PCC)

Journal of Power Electronics and Power Systems ISSN: 2249-863X(online), ISSN: 2321-4244(print) Volume 4, Issue 2 www.stmjournals.com

Single-Input Fuzzy Logic Controllers for Efficiency Maximized Separately Excited DC Motor Mohammad Abdul Mannan1*, Toshiaki Murata2, Junji Tamura2 Dept. of EEE, American International University â&#x20AC;&#x201C; Bangladesh, 83/B Road 14 Kemal Ataturk Avenue, Banani, Dhaka, Bangladesh 2 Dept. of EEE, Kitami Institute of Technology, 165Koen-cho, Kitami, Hokkaido, Japan

Abstract In this paper, three single-input fuzzy logic controllers are designed to control field current, armature current and speed of efficiency maximized separately excited DC motor. The necessary of field controller is to maximize the efficiency by tracking the optimized field current for different operating points. In contrary to the conventional fuzzy logic controller which requires at least two inputs variables and nine rules, the proposed controller requires one input and seven rules. However, the performance of the controller is not degraded. The proposed single-input fuzzy logic controllers can be realized by using a simple look-up table which makes faster fuzzy calculation even using an inexpensive digital processor. Using the Matlab/Simuink simulations, it can be shown that the proposed controller exhibits good performance by reducing the steady-state error, and overshoot problems and robustness under the variation of load torque.

Keywords: Single-input fuzzy logic controller, efficiency maximization, field current controller, armature current controller, speed controller, separately excited DC motor

Journal of Power Electronics & Power Systems ISSN: 2249-863X(online), ISSN: 2321-4244(print) Volume 4, Issue 2 www.stmjournals.com

The Time and Frequency Response of Shielded Transformer Windings Mohamed M. Saied* IEEE Senior Member, Professor (Emeritus), Independent Researcher, Giza, Cairo, Egypt Abstract A distributed-parameter model is presented for the transient and frequency analysis of power transformers’ windings in the presence of electrostatic shielding, a technique occasionally applied for improving their initial voltage distribution. The s-domain solution takes into account the windings’ circuit parameters with special emphasis on the additional distributed capacitances between the windings’ conductors and the conducting shield which is connected to the windings’ line terminal. The closeness of the resulting initial voltage profile to the ideal case of uniform distribution is suggested as a criterion for assessing the achieved improvement in the windings’ voltage stresses. This leads to the determination of the optimal shielding arrangement. The sensitivity of the modified initial and transient responses to step and double-exponential voltage stimuli is investigated. Moreover, the resulting change in the windings’ series and parallel resonance frequencies is also addressed.

Keywords: Power transformers, equivalent circuit, power system transients, transformer winding, shielding, distributed parameters, initial voltage distribution, high-frequency model, frequency response, resonance

Journal of Power Electronics & Power Systems ISSN: 2249-863X (online), ISSN: 2321-4244 (print) Volume 4, Issue 2 www.stmjournals.com

Direct Power Control of Induction Motor Drive Abolfazl Halvaei Niasar*, Hossein Rahimi Khoei Department of Electrical & Computer Engineering, University of Kashan, Kashan, Iran Abstract Different variable frequency strategies have been developed for control of induction motors including V/f scalar control; field oriented control (FOC), and direct torque control (DTC). Recently, direct power control (DPC) has been developed to control dual-fed induction generators (DFIGs) and permanent magnet synchronous generators (PMSGs). In this paper, DPC is employed for speed control of induction motors fed by a voltage source inverter. DPC is basically similar to DTC method in structure and response. Moreover, the measuring of feedback power is easier than prediction of feedback torque in DTC and there is no need to model parameters of the motor. Simulation results are presented in order to demonstrate the effectiveness of the proposed DPC technique.

Keywords: Induction motor drive, speed control, direct power control, hysteresis control

Journal of Power Electronics & Power Systems ISSN: 2249-863X (online), ISSN: 2321-4244 (print) Volume 4, Issue 2 www.stmjournals.com

Evaluation of Reliability in Five-Phase Induction Motor Operated at Low Speed by V/F Control Method using FPGA Manjesh* Department of Electronic Science, Bangalore University, Bangalore, Karnataka, India Abstract This paper presents the study of performance and reliability evaluation of five-phase induction motor by finding various parameters in the induction motor. Induction motors have increased demand for low cost and size, simple construction, least maintenance, operational simplicity and brush-less construction with cage rotor. Industrial applications demand high efficiency, and reliable and long life-time electrical machines. The fault modes of induction machines are very complex; many researchers are plagued to find fault evidences for reliability verifications. The reliability evaluation has been studied with various parameters, like efficiency, line current, working of motor with variable voltage with fixed frequency and measurement of torque at various loads. Harmonics have major effect on reliability of the motor, because the heat generated in the five-phase induction motor due to harmonics [1, 2] leads to probability of failure in the induction motor. The temperature at various parts of the five-phase induction motor has been estimated experimentally to evaluate the reliability of the Induction motor presented in this paper.

Keywords: Five phase, conduction mode, induction motor drive, PWM, EMI