Indexing

Abstract: The main aim of this paper is to increase yields of aqua-culture farmers by creating ponds where aquatic animals are made to develop in their natural habitat. Water quality determines the ultimate success or failure of an aqua culture. The farmer must record and mange water quality all through the growing season. Water quality parameters affect respiration, feeding, metabolism and reproduction of aquatic animals. The parameters which are to be kept at certain optimal levels in water are dissolved oxygen, temperature, pH level.
Theses parameters can vary a lot during the period of day and can rapidly change depending on external environmental conditions. Hence it is necessary to monitor these parameters with high frequency, if not continuously, for timely analysis and action. This need accurate real-time information system and performance in order to maximize their potential. It is found that the current manual water quality monitoring entails tedious process and is time consuming. The parameters such as temperature, pH level of the water can be measured. The measured values from the sensors can be processed by ardunio board and send to Raspberry pi board through usb. Finally, the sensor data can be viewed on internet using IOT platform (UBIDOTS).

Abstract: Deployable potential of renewable energy sources in India is massive (~1000 GW) even if 10% of which is deployed properly will fulfill demand of the largest load centers of India even by 2035. Grid Integration of such systems is not easy due to fluctuations in weather conditions but can be estimated on basis of past trends. Planning of transmission lines properly with good regulations will really be a great help to ever increasing demand of the country. 

Abstract: This paper presents a FPGA based modulation scheme and a close loop controller is designed for paralleled Z-source inverter systems which is applicable for alternative energy sources. A modulation scheme is proposed based on simple shoot-through principle with interleaved carriers to give enhanced ripple reduction in the system. FPGA based programming language is used to generate twelve switching pulses and shoot through pulse. A control method is proposed to equalize the amount of power injected by the inverters in the grid-connected mode .The modulation and controlling methods are proposed to have maintainability, and improved reliability of supply can be achieved. DsPic based system is used to obtain the control circuit. The performance of the proposed paralleled Z-source inverter configuration is validated with simulations carried out using Matlab. Moreover, a prototype is build to obtain the experimental verifications.
Keywords: Controller, DG System, FPGA, Grid connected mode, Parallel Inverters, Simple shoot through, Z Source.
Title: FPGA Based Modulation and Control of Paralleled Z source Inverter Applicable for DG Systems
Author: Gopika T G, Pradip C
ISSN 2349-7815
International Journal of Recent Research in Electrical and Electronics Engineering (IJRREEE)
Paper Publications

Abstract: Multilevel inverter topology has emerged in recent times as a very important in different are of high power medium voltage energy control. In this paper, cascaded multilevel inverter is used to reduce the total harmonic distortion. A cascaded multilevel inverter consists of series H-bridge (single phase, full-bridge) inverter units. Cascaded multilevel inverters are very popular and has many applications in electric utilities and for industrial drives. When these inverters are used for industrial drives directly, the THD of the output voltage of inverters is very significant, as the performance of drive depends very much on the quality of voltage applied to drive. A multilevel inverter in high power rating improves the performance of the system by reducing harmonics. In this paper the operation of 5-level cascaded H-bridge inverter is simulated for resistive load. By changing the conduction angle of inverter units, change in THD of output voltage is analysed. The simulation is done by MATLAB software.

Abstract: Power quality is very important aspect in power system. The harmonics in power system are produced by various electronic devices. Conventional inverters produce more harmonics and distortions in power system which can be reduced by filters with increase in size and cost. Multilevel inverter reduces the harmonic contents and achieves sinusoidal signals without extra circuitry. For output step-pulse waveform, it is necessary to obtain the conducting angles of switching devices. The predominant lower-order harmonics can be eliminated. In this paper simulation of 5-level inverter for lagging power factor load is done and by using constant-K filter the output voltage and current harmonic distortion is analysed at different combination of conduction angles. A comparative performance of filter is also presented for different values of filter cut-off frequency.
Keywords: Multilevel Inverter, Conduction angle, Harmonic distortion, Harmonic factor, Filter, Cut-off frequency.

Abstract: Transmission lines functions as arteries that carry electricity from power stations to regions where the power is needed. Therefore, it is vital to control the construction and maintenance costs of these lines because while the frequency of transmission line faults resulting in power loss due to natural cause of lightning is not yet reduced. Lightning is one of the most natural and serious cause of over voltage. The effects lightening on overhead transmission line have always been a matter of concern in studies of power distribution, transmission line and up gradation of transmission system. General transmission lines get very much affected by lightening thunder (leader stroke), the magnitude and shape of the lightening on overhead transmission line will be in undetermined and unpredictable form. It takes place for some microseconds to milliseconds and as it arises (immerges on object), it causes an serious damage to the system where it immerges. In this paper, we obtain analysis of 330kV and 132kV overhead transmission line structure and lightning protection to reduce the potential damage to Electric Power System.