ABSTRACT
Urban electrical power systems with steep demand increase need easily located solutions with short lead time from decision to transmission. While AC cable solutions can offer sufficient power ratings, the problems of load controllability and short circuit power increase with every added circuit. These problems may be countered with Voltage Source Converter (VSC) based technology using Cables for transmission, such as HVDC Light. This technology offers up to 500 MW per station with small footprint, ideal for in feed to city ....etc

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A converter transformer is a main component in the HVDC transmission system. The converter transformer failure is the major cause of worry of electric power utilities. It is the top portions of the secondary windings of the converter transformers that fail leaving the primary winding unaffected. In this article, a practical HVDC system has been modelled to find the the causes for these failures. The MATLAB/SIMULINK environment has been used as the modelling environment. The possible solutions that emerged include providing passive filters on ....etc

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so i would likt to get more information..
and i need to special ppt materia..

thank you for your information and help. ....etc

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Abstract
This paper presents a general model of dual infeedHVDC system applying VSC-HVDC, which can be used as anelement in large multi infeed HVDC system. The model may havedifferent structure under different grid faults because of theaction of breakers. Hence power flow of the system based on thismodel is analyzed under steady state and different kinds of gridfault transient situations. Two main control methods applied onVSC-HVDC page link in this dual infeed HVDC system areinvestigated, and comparative analysis of them under transie ....etc

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Voltage Source Converter (VSC) based HVDC transmission systems are available in market for power rated between a few MVA to a few hundreds of MVA. The new system results in many application opportunities and new applications in turn bring up new issues of concern. This paper aims at exploring the HVDC transmission systems and also presents a comprehensive investigation on one of the concerned issues, which is the contribution of HVDC Light? to short circuit currents. Different AC network conditions, load conditions and fault types are considere ....etc

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BASIC HVDC AND CONVERTER OPERATION



Why HVDC rather than HVAC?
Long distances make HVDC cheaper
Improved page link stability
Fault isolation
Asynchronous link


Inverter operation ( = 140º)
Firing is delayed so much that the entire area enclosed between the voltage waveform and the zero line is of opposite polarity.

The equation written in terms of  is still correct:

Vd=Vdio -0.766-Id. Xc+Er
2
Vd=-Vdio x 0.8609
H ....etc

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Presented by
V.Kalyani
B.Padmini


VOLTAGE SOURCE CONVERTER TOPOLOGY FOR HVDC GRID CONNECTION OF OFFSHORE WIND FARMS
ABSTRACT
Large offshore wind farms are recently emerging as promising alternative power Sources. Long distances between offshore generation and onshore distribution grid demand new solutions for their connection to the AC network. HVDC systems based on voltage source converters (VSC) are a promising alternative to conventional AC transmission above a certain cable length. This paper p ....etc

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Need powerpoint presentation on hvdc light city infeed with hvdc light and extruded cables ....etc

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