i-manager's Journal on Power Systems Engineering (JPS)


Volume 4 Issue 3 August - October 2016

Research Paper

Digital Simulation of Eight Bus System with DPFC by Employing Five Level Inverter

Akhib Khan Bahamani* , Sreerama Reddy G.M**, V. Ganesh***
* Research Scholar, JNTUA University, Anantapur, Andhra Pradesh, India.
** Professor and Head, Department of Electronics and Communication Engineering, C.B.I.T, Kolar, Karnataka, India.
*** Professor, Department of Electrical and Electronics Engineering, JNTUA, JNTUA College of Engineering, Pulivendula, Andhra Pradesh, India.
Bahamani, A. K., Reddy, G. S., and Ganesh, V. (2016). Digital Simulation of Eight Bus System with DPFC by Employing Five Level InverterPaper. i-manager’s Journal on Power Systems Engineering, 4(3), 1-11. https://doi.org/10.26634/jps.4.3.8267

Abstract

In recent times, Distributed Power Flow Controller is an important device within the family of FACTS Devices. This paper investigates Multi Level Inverter (MLI) based Distributed Power Flow Controller (DPFC) system for voltage sag mitigation and harmonic reduction. The DPFC employs a Shunt based Static Compensator (STATCOM) and multiple series converters to improve the power quality. DPFC was placed at the correct location in the power transmission system to gain advantages like improved voltage profile and reduced power loss. Circuit models are developed for Eight bus system with and without DPFC. The MATLAB/SIMULINK results obtained shows an improved performance in voltage sag mitigation, voltage quality of load busses, power quality improvement, comparison of the bus voltages with and without DPFC and reduction in load voltage harmonics. The results indicate that MLI based DPFC has improved in power quality and reduction in total harmonic reduction.

Research Paper

Decision Tree Technique of High Impedance Fault detection in Distribution Feeder

N. Rajasekhar Varma* , Sanker Ram**
* Associate Professor & HOD, Department of Electrical and Electronics Engineering, RSS College of Engineering and Technology, Anantapur, Andhra Pradesh, India.
** Professor, Department of Electrical and Electronics Engineering, Jawaharlal Nehru Technological University, College of Engineering, Hyderabad, Telangana, India.
Varma, N. R., and Ram, B. S. (2016). Decision Tree Technique of High Impedance Fault detection in Distribution Feeder. i-manager’s Journal on Power Systems Engineering, 4(3), 12-27. https://doi.org/10.26634/jps.4.3.8268

Abstract

Distribution lines subjected to vagaries of nature are prone to metal fatigue, which results in snapping of live conductors. These broken conductors, upon contact with earthed objects or, among themselves, cause High Impedance Faults (HIF) which are difficult to be detected, based on system parameters. The faults cause arcing grounds, which are prone to fire hazards, leading to loss of life and property. This paper presents a novel method of HIF in distribution feeders, using Wavelet and Decision Tree approaches. Wavelet approach has proved to be successful in understanding and evolving solutions to many problems in Power Quality, Power System Protection, and Transient Analysis. The technique adopted, uses Wavelet Transform (WT) in the pre-processing stage for feature extraction, which is used to prepare the necessary data, to be used in the Decision Tree. The current waveform, when measured at the relaying point, yields coefficients which are used as the inputs to the decision tree. A realistically developed HIF model using a typical IEEE 13 Radial Distribution System was used to determine the performance of the technique for different types of HIF and Capacitor switching, linear faults and non linear load switching, etc. The method was found to be robust, fast, and accurate.

Research Paper

Multi-Attributes Based Health Assessment of Power Transformers

Chilaka Ranga* , Ashwani Kumar Chandel**, Rajeevan Chandel***
* Ph.D Scholar, Department of Electrical Engineering, NIT, Hamirpur, HP, India.
** Professor and Head, Department of Electrical Engineering, NIT, Hamirpur, HP, India.
*** Professor, Department of Electronics and Communication Engineering, NIT, Hamirpur, HP, India.
Ranga, C., Chandel, A. K., and Chandel, R. (2016). Multi-Attributes Based Health Assessment of Power Transformers. i-manager’s Journal on Power Systems Engineering, 4(3), 28-38. https://doi.org/10.26634/jps.4.3.8269

Abstract

Condition monitoring of power transformers improves the reliability and the safety of an electrical power system. It protects the transformers from fire hazards, and avoids a huge revenue loss to the utilities. The health status of transformers is decided by their several influencing factors. An accurate health assessment of transformers based on various influencing factors has been a challenging task for the researchers as well as the diagnostic experts. In the present paper, a new multi-criterion technique for assessing the health condition of the transformers has been proposed. The main aspects of transformers have been taken into consideration in evaluating their present health status. The overall outcome of the proposed model depends upon all considered attributes as a whole, but not on any single attribute. Hence the proposed approach determines the more reliable and accurate health condition of transformers. It removes the over influence of the attributes in an exact decision making. It also overcomes the shortcomings of the conventional health assessment methods of transformers. Final calculated factors imply what kind of action needs to be implemented for optimal performance and life extension of the transformers.

Research Paper

Optimal Conductor Selection Using Grey Wolf Optimization

M. Laxmidevi Ramanaiah* , M. Damodar Reddy**
* Research Scholar, Department of Electrical and Electronics Engineering, Sri Venkateswara University College of Engineering, SV University, Tirupati, India.
** Professor, Department of Electrical and Electronics Engineering, Sri Venkateswara University College of Engineering, SV University, Tirupati, India.
Laxmidevi, R. M., and Reddy, M. D. (2016). Optimal Conductor Selection Using Grey Wolf Optimization. i-manager’s Journal on Power Systems Engineering, 4(3), 39-43. https://doi.org/10.26634/jps.4.3.8270

Abstract

Conductor selection plays an important role in distribution system. The usual approach is to select the conductor with the least cost. This has an adverse effect on the losses. There is a need to determine the conductors in such a way that there is reduction in the cost of conductor and reduction in losses. Initially, the type of conductors are selected based on flat voltage profile. To reduce the cost of losses incurred on energy and cost of depreciation and interest, the optimization method named as Grey Wolf Optimization (GWO) is proposed. Also the increase in load which can be applied to the network without changing the configuration of the conductors obtained after optimization is determined. The systems used to test the given objective are 16 bus, 22 bus, and 24 bus systems with MATLAB.

Research Paper

SVPWM controlled Inverter for Solar Power Generation

Mayank Tyagi* , Ritesh Sharma**
* M.Tech Scholar, Department of Electrical and Electronics Engineering, Ajay Kumar Garg Engineering College, Ghaziabad, Uttar Pradesh,
** Assistant Professor, Department of Electrical and Electronics Engineering, Ajay Kumar Garg Engineering College, Uttar Pradesh, India.
Tyagi, M., and Sharma, R. (2016). SVPWM controlled Inverter for Solar Power Generation: A Review. i-manager’s Journal on Power Systems Engineering, 4(3), 44-52. https://doi.org/10.26634/jps.4.3.8271

Abstract

ln this paper, performance of solar photovoltaic power system using State Vector Pulse Width Modulation technique is studied. As we know the solar photovoltaic power generation is getting a wide attention because of its clean and renewable energy, which is the need of the hour to use as an alternate to the conventional energy. However, the power produced by solar PV system contains some power quality problems such as low output voltage, harmonics, ripples, and poor power factor. SVPWM techniques can be applied to reduce such problems. Such methods will be studied in this paper of solar PV power generation containing boost converter.