Graduate Thesis Or Dissertation
 

Simulation of a high voltage direct current transmission system in an electromagnetic transients program using semiconductor terminals

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9z903348g

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  • In high voltage direct current(HVDC) systems transmission technology, a.c. power is converted(rectified) to d.c. power by means of a controlled rectifier bridge. This d.c. power is then transmitted through a d.c. link to another converter(inverter) where it is converted back to a.c. power by means of another controlled rectifier bridge. The power thyristor is the the main semiconductor element of these converter circuits. Modern interest in HVDC system technology has been on the increase since the 1950's owing to the reduced costs of transmission of d.c.(as opposed to a.c.) power for a transmission distance over 500 miles. Research in this area is generally done using an HVDC system simulated on the basis of the equivalent circuits of the converters. Also the control of the converter circuits is based on the input or output a.c. voltage waveforms. The HVDC system is simulated in the Electromagnetic Transients Program using the actual circuits of the converters. This provides the means to expose the behavior of the HVDC system under steady-state and as well as transient conditions. Furthermore, the effect of different control strategies can be verified in detail. The thesis presents the results of thyristor control entirely based on the waveform of the voltage directly across the individual thyristors rather than on the basis of idealized waveforms. The characteristics of the HVDC system which under ideal conditions can be theoretically predicted, could be confirmed by the solutions obtained from the simulations. These results have been discussed in detail. Suggestions for slight modifications necessary to make the simulation programs more comprehensive for large scale research purposes are included.
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file details NwaChukwuDavidO1987.pdf 2017-08-22 Pubblico Scaricare