Indexing

Abstract: The study investigated the viability of using hybrid models of renewable power generation in certain geographical areas where the climate is suitable. A real model of the set-up was created and the data obtained was compared to simulated models to improve accuracy. The data from both the real set-up and the simulated model were then compared to climatic conditions in certain rural areas of India. As of submission of this report, wind is not a prevalent source of energy in the southern Indian state of Karnataka; this project aims to conclude whether such non-utilisation is justified or whether it would be beneficial if such hybrid models be used in certain areas of suitable conditions.

Keywords: Hybrid Models, Investigated The Viability, Off-Grid Rural Areas.
Title: Investigating the Feasibility of Solar Wind Hybrid Systems for Off-Grid Rural Areas
Author: Pavan Chitta
ISSN 2349-7815
International Journal of Recent Research in Electrical and Electronics Engineering (IJRREEE)
Paper Publications

Abstract: Synchronous generators under sudden loss of excitation behave as an induction generator, supplying active power to the system and absorbing reactive power from the system. In general the armature current exceeds its rated value. Hence, the reference power is reduced in steps to keep the armature currents within limits. The voltage profile around the faulty machine becomes unacceptably poor and in addition there is exchange of pulsating power with the system. Hence, the general practice is to switch off the machine by the action of an offset type MHO-relay. Recently, the capacitive VAR-generation of a H.T. system has gone up due to addition of EHV/SHV lines, such that there is no or little problem in supplying the faulty machine with its required VAR. Also, the magnetizing current drawn by modern turbo generators has reduced much due to the use of smaller air-gaps for economic design of the rotor. The combined effect has been assessed, and it has been found that it is permissible to run the machine for a relatively long duration under LOE without staking on its health. It may be allowed to run the machine for 30-60 minutes under LOE, within which time the fault may be detected and removed and the machine resynchronized. However, this is not possible for hydro-generators drawing large magnetizing currents.

Keywords: Synchronous generator, Governor Action, Newton-Raphson method, Excitation system, Loss of excitation, Mho-relay.
Title: Performance Evaluation of Synchronous Generator under Sudden Loss of Excitation
Author: Sohorab Hossain, Subimal Roy Burman, Sourish Sanyal, Amaranth Sanyal, Raju Basak
International Journal of Recent Research in Electrical and Electronics Engineering (IJRREEE)
ISSN 2349-7815
Paper Publications

Abstract: It is a difficult task to make proper adjustment of towing vehicles, keeping the motion secured and predetermined. In older days the control was manual. Now-a-days automatic feedback control systems are used. The specifications are very stringent due to imposition of govt. and industrial rules. There are constraints on steady state accuracy, transient performance and stability margins. The requirements are contradictory. If the steady state accuracy is realized, the transient requirements and the stability margins cannot be maintained.  It is difficult to fulfil the requirements by modifying the feedback or adding feed-forward. It is expedient to add a compensator in the forward or feedback path. In this paper, the design of a towing aircraft has been taken up. Its block diagram and transfer function are given. The gain has been fixed up to keep the steady state error within prescribed limits. The transient performance has been shaped and stability ensured by adding a lag compensator of chosen parameters.

Keywords: Towing Air-Craft, Forward Path Gain, Feedback Path, Transient Performance indices, frequency-domain analysis, and stability margins.
Title: Design of Compensator for Roll Control of Towing Air-Crafts
Author: Avik Ghosh, Sourish Sanyal, Amar Nath Sanyal, Raju Basak
ISSN 2349-7815
International Journal of Recent Research in Electrical and Electronics Engineering (IJRREEE)
Paper Publications