Abstract:The Electronic based FACTS controllers are static equipment. Its principle purpose is to control AC transmission. The parameters of FACTS are enhancement of controllability, ability of power transfer, control of line impedance, load angle and the magnitude of bus voltage. A unified power controller is to be a static device and this system device should have quick reactive transmission. This paper focuses on the issues like voltage sag and swell of power quality. DPFC is used to moderate the voltage variation and improve power quality and also used to couple the phase controllable bridges to produce current which is injected into a transmission line by using series of transformers. The UPFC is a combination of a static synchronous compensator (STATCOM) and a static synchronous series compensator (SSSC) which is coupled with common DC link. The DPFC eliminates the common dc link between the shunt and series converters and also it performs in transmission line to exchange real power between converters at the 3rd harmonic frequency. The DPFC employs several 1-phase converters like D-FACTS concepts as the series compensator. These concepts reduce the rating of the components and offer a high reliability. Since the DPFC can immediately control the active and reactive power flow and the voltage magnitude, it implies a great potential for power oscillation damping. The case study contains a DPFC located in an exceedingly single-machine infinite bus power grid with 2 parallel transmission lines that simulated in MATLAB/Simulink. The bestowed simulation results of a DPFC device wont to improve the facility quality.

Keywords:Power Quality, voltage Sag and voltage Swell, Unified Power Flow Controller, Distributed Power Flow Controller

Abstract:Wind power evolution in Northern Europe is foreseen to continue in the future with development of largescale wind power plants (WPPs) on far offshore. Integration scheme of these WPPs to the onshore grids would grow from point-to-point connection to a transnational multi-terminal network where the transmission capacity serves both to evacuate the wind power and to facilitate power trading between countries. In such a situation, application of multi-terminal VSC-HVDC transmission is considered the favorable technological solution. A control strategy which capable of accommodating different dispatch schemes is however required. This paper presents a control strategy for dispatching power in the future transnational network situation. The control strategy is developed based on the voltage margin method and is customized to comply with different dispatch schemes possibly be applied in the future transnational network. The control strategy is implemented on a multi-terminal VSC-HVDC network representing the future transnational network and its capabilities are confirmed through simulation studies for normal and abnormal operations.

Keywords:wind power plants (WPPs) , VSC-HVDC MATLAB ,Fault Ride Through(FRT) methods.

Abstract:Flexible AC Transmission System (FACTS) controllers, such as the Static Var Compensator (SVC), employ the latest technology of power electronic switching devices in electric power transmission systems to control voltage and power flow, and improve voltage regulation. Given a profit-driven, deregulated electric power industry coupled with increased load growth, the power transmission infrastructure is being stressed to its upper operating limits to achieve maximum economic returns to both generator and transmission system owners. In such an environment, system stability problems such as inadequate voltage control and regulation must be resolved in the most cost-effective manner toimprove overall grid security and reliability.

Keywords:FACTS, SVC, Var, voltage control

Abstract:This project mainly focused on distribution of quality of power. The main criteria required for all the devices is the voltage. It plays vital role in a power quality. In this project it is planned to provide a transformer with multiple taps and selecting the taps required for the moment will be automatically selected by the on-load changeover system which is operated by the controller. In this project as a project model computer acts as a controller with the aid of the Csoftware. In this project voltage transducers are used to sense the voltage and ADC to convert into digital signals. These digital signals arte interfaced with computer which in turns operates the on load tap changers. Suitable taps are selected and its drive relays are operated by the computer through opto-coupler and switching transistors

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Abstract:Nanotechnology ,when we talk about nanotechnology the first thing which came into our mind is the size and we imagine whole new different world on a Nano scale .and its really fascinating because nanotechnology is not just a technology it�s a revolution because it�s not just a technology which can be applied to specific area of research or specific field .it has the power to maximize all limitations which we are facing now a days in industrial ,medical ,manufacturing , electronics, and so many different fields .we are living in a digital world so as we are looking into future more and more the daily instruments goods which we use in our day to life are getting compact in size and much more comfortable to use light in weight and the quality of that product is getting better day by day. nanotechnology actually deals with materials on Nano scale its being used since last hundreds of years accidentally in the field of manufacturing. in 1980�s Drexler he is the man who actually thought that and really talked about the little robots on Nano scale which can actually position atoms in precise places we can call it molecular assemblers he is the futuristic person. But now a days also most academics and researchers especially who belong to chemistry, physics and manufacturing field they all are pushing down there limits to nanometer scale. But like every technology this also has challenging factors which manufacturing researchers are facing that fabrication on the Nano scale is very much difficult to achieve because we had developed fabrication units up to micro scale .apart from this scientist have developed so many other important products ,medicines with the help of nanotechnology

Keywords:electronics ,nanotubes, history(nanotechnology)