On 29/07/18 17:58, Michael J. Mahon wrote:
> High voltage semiconductors and high frequency switching are changing the
> landscape of power transmission and conversion. The “smart grid” of the
> future will have a lot less iron cores.;-)

It is possble and even likely that HVDC will replace AC grids. It
already is used to interconnect different grids. In is inherently lower
loss due to capacticance not being a feature. (charging up all that line
to line and line to earth capacitance loses energy in the tranmsission
line resistance, just as much as in phase currennt does).



But it has a problem: in a normal grid the rotating masses of all the
gnetrators snd their turbibes mean that a sudden load change or
generator loss can tap this store of spinning mass energy, and a voltage
drop followed by a slowly falling frequency is a good signal to use to
determine wahat extra power needs to be fed in.

That mecahnism's functionality needs replicating with a DC grid. Maybe
big capacitors on the lines would provide some inherent storage.






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