Volume 3 Issue 1                         January – March 2015

An Efficient Topology and Control Strategy for Multilevel Voltage Source Inverters [pp 01-05]
Kurariya Pratiksha, Thakur Chitra
Abstract: Application of multilevel converters because of its superior performance gaining the popularity in industrial applications. As mentioned the superior performance which largely influenced by the high quality output waveform of multilevel converters in comparison to two-level inverters. In this paper, firstly a multilevel converter topology with efficient placement of switches for increasing the voltage levels in the output waveform is presented and then an efficient low complexity minimal component digital control block is developed to control the converter. The presented multilevel converter requires minimum number of switching and controlling devices. Particular attention has been given to the control circuitry to obtain optimal control of the waveform with minimum number of gates ….

Calculation & Performance of an Evaporative Cooling System (EAC) on Conventional Bus [pp 07-13]
Kolewar Arun Kumar, Dr. Shrivastava, Shrivastava Nitin
Abstract: India is counted as hot countries amongst all over the world, because sun rays falling directly and horizontally most part of the it , living surroundings for the duration of summer go extreme with temperature rising up to 46° C. The environment further goes worse when the humidity levels are very low. The situations go harsh while travelling. This research paper has been performed to provide suitable way out to this problem keeping this background in preview. The research has been targeted to provide air conditioning comfort in rural travelling conditions and to initiate the idea, a conventional bus conditions are chosen for experimentation. A cheap means of airconditioning has been designed which can be used for local and mass transport means. The idea is to provide air-conditioning comfort to common ….

A Literature Review on Various Topologies used in Multilevel Voltage Source Inverters. [pp 14-19]
Kurariya Pratiksha, Thakur Chitra
Abstract: This paper presents a brief study of some most common multilevel inverter topologies and control techniques. The advantages of multilevel inverter topologies such as such as low power dissipation on power switches, lower harmonic distortion and electromagnetic interference generation are made it a preferable choice for the application in medium and high power systems. However the quality of output power also depends upon the applied switching technique to control the inverter and is responsible for producing the required output while maintaining the harmonic distortion at the lowest possible value. Besides ….

A Comparative Study for Retrofitting of ….[pp 20-26]
Narayan Lalit, Arya Abhishek & Khare Sachin
Abstract: The Montreal Protocol has sealed the use of Halogenated Hydrocarbons; keeping in view they affect the environment in the form of Ozone layer depletion and Global warming. Thus one of the major thrust areas is to identify substitute of Halogenated Hydrocarbons, especially CFCs. The substitute refrigerant should be eco-friendly, chemically stable and compatible with existing refrigeration systems with transport and thermal properties similar to or better than CFCs. Since the refrigeration system use CFC- 12 as refrigerant universally, the search for a suitable alternative for CFC-12 is inevitable.HFC-134a is currently the leading alternative to CFC-12. Other promising substitutes are R-423 as a binary ….

TCSC switching with IGBT to enhance the switching operation and to improve stability [pp 27-33]
Sahu Praveen Kumar, Bisen Prity
Abstract: This paper presents test results for a power system using TCSC switched by IGBT’s to compensate the inductive impedance of the synchronous generator and control the active power injection. Different switching angles were evaluated at some compensation levels and simulations are do n e to analyze the effectiveness and robustness of the proposed controller project. Due to the use of IGBT switching several enhancements are levied which are studied herewith.

Analysis of Various Properties of Textile Tarpaulins Made From High Density…. [pp 34-38]
Dubey Ritesh, Jain Abhishek, Dr. Choudhary Keshavendra
Abstract: There are lot of plastic materials and products being used in various application and sometimes it requires knowing the life time of the products used in some critical application. These predictions of service life enable to understand and benchmark product life cycles in the application field.In this project work I have studied the Mass and Breaking Strength of tarpaulin as a function of time with the constant exposure to the plastic product at 70o c for 23 week .The above mentioned properties were studied periodically as per is 7903.The life time prediction studies were carried out as per ASTM D3045 from the studies it has been observed that 5-20% property determination is taking place during exposure.