Saving Energy with Active Filters
By Kurt Schipman / Published on Fri, 2006-11-10 00:15An active filter has been installed in a ferry boat, and after one year of operation, 18,000 liter of fuel saving is observed. Other ferries are subsequently equipped as well with active filters, and similar results confirmed.
In this new minute lecture, in partnership with ABB, 4 case studies are introduced, each showing how installing active filters can have an energy saving effect in vessels, extruder lines, ac motors and stadium flood lights.
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Comments
Are these energy savings for real?
By Hans De Keulenaer / Published on Mon, 2007-01-15 17:14We received quite a few reactions to this minute lecture, which I tried to summarise in this open question on the forum:
http://www.leonardo-energy.org/drupal/node/1453
See also Kurt Schipman's comments to these reactions
Hans De Keulenaer
Manager - Leonardo ENERGY Initiative
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I miss a precise description
By Stefan Fassbinder / Published on Fri, 2007-02-16 10:09I miss a precise description of the observation made. Over which time span was it observed? Which distance? Weather conditions? Loading (cargo / freight) of the ship? Speed? How high has the accidental variance of fuel consumption been before the filter installation?
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Saving Energy with Active Filters
By Colin Hargis / Published on Mon, 2007-02-19 12:11It is possible to be a little more scientific about this question of losses associated with harmonics.
The source of the harmonics is the non-linear load, so the losses are exported from the load at harmonic frequencies. The power could be measured for each harmonic from the magnitude and phase angle of the harmonic voltages and currents at the load terminals. I am not aware of an instrument which does this automatically, but it would not be too difficult to export time data from an oscilloscope into a suitable calculator.
As a reality check, consider the following argument:
For a 6-pulse system the 5th harmonic current is typically around 30%. Permitted harmonic voltage is 8% maximum, normally we plan for 5% or less. So the VA product at 5th harmonic in this case is 2.4% at most. To get the power we need to know the phase angle - which we don't, but on the basis that our calculations assume a predominantly inductive source impedance, we should guess that it is unlikey to be higher than 0.2, say.
The power loss associated with 5th harmonic now becomes 0.48%.
This is a crude estimate, but it does show that for harmonics to be associated with power loss as high as 10%, (as opposed to 10% of losses) they need to be extraordinarily high.
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