i-manager's Journal on Electrical Engineering (JEE)


Volume 10 Issue 2 October - December 2016

Research Paper

Effect of Ambient Conditions on Performance of Power Transformers

Chilaka Ranga* , Ashwani Kumar Chandel**, Rajeevan Chandel***
* Research Scholar, Department of Electrical Engineering, National Institute of Technology, Hamirpur, Himachal Pradesh, India.
** Professor, Department of Electrical Engineering, National Institute of Technology, Hamirpur, Himachal Pradesh, India.
*** Professor, Department of Electronics and Communication Engineering, National Institute of Technology, Hamirpur, Himachal Pradesh, India.
Ranga, C., Chandel, A.K., and Chandel, R. (2016). Effect of Ambient Conditions on Performance of Power Transformers. i-manager’s Journal on Electrical Engineering, 10(2), 1-8. https://doi.org/10.26634/jee.10.2.8321

Abstract

Effect of ambient conditions on oil impregnated paper insulation is detrimental for an extensive performance of power transformers. In this paper, effect of load, moisture and ambient temperature on the dielectric properties of transformers have been investigated using a multi-regression technique. The proposed technique incorporates the data obtained from several diagnostic tests of transformers. Oil samples collected from different transformers owned by Himachal Pradesh State Electricity Board, India have been tested and analyzed using the proposed method. It has been observed from the analysis that the effect of moisture content on the transformers’ performance is much higher than the effect of load and ambient conditions. The present analysis estimates the oil temperature as per the expected load and ambient temperatures. It facilitates the operating schedule for transformers to improve their service life time.

Research Paper

Speed Control of Switched Reluctance Motor with Torque Ripple Reduction Using Fractional Order PID Controller and Cuckoo Search Algorithm

E. Shiva Prasad* , B.V. Sanker Ram**
* Assistant Professor, Department of Electrical and Electronics Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, India.
** Professor, Department of Electrical and Electronics Engineering, Jawaharlal Nehru Technological University, Hyderabad, India.
Prasad, E. S., and Ram, B. V. S. (2016). Speed Control of Switched Reluctance Motor with Torque Ripple Reduction Using Fractional Order PID Controller and Cuckoo Search Algorithm. i-manager’s Journal on Electrical Engineering, 10(2), 9-20. https://doi.org/10.26634/jee.10.2.8322

Abstract

The intelligent controller represents a combined performance of both the Fractional Order PID controller (FOPID) and Cuckoo Search Algorithm (CSA). In this paper, an intelligent controller for the speed control of Switched Reluctance Motor (SRM) drive system using multi-objective function is proposed. The innovation of the proposed method users in enhanced probing skills, ensures the cutback of the irrational arbitrary production and exhibits supreme skills in successfully addressing and adapting the intricate optimization issues. The FOPID is offered carte-blanche in tuning the constraints in view of the fact that the order of derivative and integral do not constitute the integers. It may pave the way for further vibrant accomplishment when compared to the conventional PID controller. Now, the CSA optimized the gain parameters of the controllers for the speed error and current error regulation loops of the SRM drive control mechanism. Further, the proposed control algorithm goes a long way in optimizing the commutation angles for bringing down the lofty torque ripples. Based on the proposed algorithm control parameters, the speed control of the SRM drive has been enhanced. The proposed intelligent control technique will be implemented in the MATLAB/Simulink platform.

Research Paper

Comparison between FSIG and DFIG wind turbines for wind farm stabilization

K. Sree Latha* , M. Vijaya Kumar**
* Research Scholar, JNTUA, Andhra Pradesh, India.
** Professor, Department of Electrical and Electronics Engineering, JNTU College of Engineering, Andhra Pradesh, India.
Latha, K. S., and Kumar, M.V. (2016). Comparison between FSIG and DFIG wind turbines for wind farm stabilization. i-manager’s Journal on Electrical Engineering, 10(2), 21-26. https://doi.org/10.26634/jee.10.2.8323

Abstract

One of the promising alternative energy sources is the renewable energy sources like wind, solar, etc. Out of the various renewable energy sources, wind energy sector has grown very significantly in India. Generation, utilization and grid penetration of wind energy into the electrical grid is increasing worldwide. As the wind power is fluctuating in nature, it causes stability problems. This paper presents a comparative study on the voltage control capabilities of fixed speed and variable speed induction generators during system disturbance and grid faults. Simulation results show that the DFIG has the capability to control grid voltages and thus is capable of stabilizing the system.

Research Paper

Design and Analysis of Traction Drive System for Hybrid Locomotives using 5-Phase Permanent Magnet Synchronous Motors as Traction Motors

C. Nagamani* , R. Somanatham**
* Research Scholar, University College of Engineering, Osmania University, Hyderabad, India.
** Head, Department of Electrical Engineering, Anurag Group of Institutions, Hyderabad, India.
Nagamani, C., and Somanatham, R. (2016). Design and Analysis of Traction Drive System for Hybrid Locomotives using 5-phase Permanent Magnet Synchronous Motors as Traction Motors. i-manager’s Journal on Electrical Engineering, 10(2), 27-45. https://doi.org/10.26634/jee.10.2.8324

Abstract

Retention of Passenger and Freight Trains working on Electric Traction at Stations in the event of Grid Failures / Locomotive Failures cause inconvenience to passengers and delay in delivery of freight, thereby causing losses in revenue. As Traction is a high Power Application, delivery of Power of the order of 1600 kW per Traction Motor would also cause stresses in the Switching Devices in a 3-j Converter System. In order to overcome stress on Switches, a new Drive System using 5-j Inverter driven Permanent Magnet Synchronous Motor as Traction Motors that can run on both Electric and Diesel-Electric Traction is proposed by the authors in this research paper.

Research Paper

Comparative Analysis of Different PWM Techniques in a Five Level Inverter

Sumit Kumar Singh* , Ankit Srivastava**
* Guest Faculty, Department of Electrical Engineering, Rajkiya Engineering College, (HBTU Campus), Kannauj, India.
** Guest Faculty, Department of Electrical Engineering, HBTU Kanpur, India.
Singh, S. K., and Srivastava, A.(2016). Comparative Analysis of Different PWM Techniques in Five Level Inverter. i-manager’s Journal on Electrical Engineering, 10(2), 46-52. https://doi.org/10.26634/jee.10.2.8325

Abstract

The multilevel inverter utilization has been increased since the last decade. These new type of inverters are suitable in various high voltage and high power applications due to their ability to synthesize waveforms with better harmonic spectrum and faithful output. This paper analyzes the Total Harmonic Distortion (THD) performance of a three phase 5- level inverter. The five level inverter is configured with RL load for the analysis. Three different Pulse Width Modulation (PWM) schemes are proposed for the analysis of five level inverter. The simulation results are presented to prove that THD is reduced with different Pulse Width Modulation scheme.