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Technologies > Conclusion
HVDC is a technology with continuous advancements and it is going to
be dominant in the next few years. The potential change from CSC to VSC is going
to make HVDC much more efficient, since VSC can offer higher efficiency, faster
switching and by using less components make systems smaller and cheaper. Also, given
the fact that VSC can make the change in power flow much easier, it will allow the
creation of HVDC grids, multi-terminal networks that are much more efficient than
point to point HVDC transmission and AC grids.
The creation of such grids depends on the development of HVDC circuit
breakers that can efficiently handle fault situations in such high voltage ratings
and currents. Electromechanical breakers can work up to a few hundreds of kilo-volts,
but changes are required so that they can cost less and interrupt faster than they
do at the moment. On the other hand, solid-state circuit breakers are much faster
than the electromechanical ones, but can work up to 150kV and their on-state losses
are too high.
We can see that the creation of appropriate circuit breakers can lead
to great changes in the area of energy transmission. Dr Uhlmann’s statement
that “It can be safely stated that a DC circuit-breaker will be available
at the time the need for such arise” has become much more relevant today,
since with the advancements in the HVDC field and the uprising need for energy transport,
circuit breakers are the only thing that stops the creation of HVDC grids which
can change the way power is transferred all over the world.
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