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Romy the Cat wrote:

I just watched a film about the construction of the Dubai’s famous Burj Al Arab Hotel. The program told that the engineers come across the problems with high harmonic distortions of electricity that powered up the Hotel (220 suites with 14kVa (!!!) consumption in each suite, all on dimmers). They use an interesting method to fix it. They read the harmonic distortions in real time and then they inject the same contra-phase distortions into the power lines, effectively killing all distortions from power lines and restoring the sinewave's shape. It works like the active noise cancelation systems Bose uses in their headphones. That might be a very interesting direction to look...

http://www.shadaly.com/continuous_feed-forward_ac_voltage_regulator_6653824.html

There is an commercial devise that operates on above principle:

http://www.exactpower.com/products/ep15a/index.html

http://www.exactpower.com/products/ep15a/reservepower.html

http://www.exactpower.com/products/ep15a/feedforward.html

http://www.exactpower.com/products/ep15a/specifications.html

This principle should NOT provide any decupling from the grid at all but it theoretically should kill the harmonics in real time. I have no idea what sonic consequence the principle has. Did anyone ever try it for Sound?

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