<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt"><div><span>The first thought that comes to mind is recative power is not real power, and is normally solved with pavsive devices like capacitor banks. There are things like switchable capacator banks that canvary the reactive power by having diffreent amount of capacators to the line. </span></div><div><span></span> </div><div><span>So although I think inverters can reactive correction, why not use a capacitive device? </span></div><div><span>Darryl</span></div><div><br></div> <div style="font-family: arial, helvetica, sans-serif; font-size: 12pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <font size="2" face="Arial"> <div style="margin: 5px 0px; padding: 0px; border: 1px solid rgb(204, 204, 204); height: 0px; line-height: 0; font-size: 0px;"
class="hr" contentEditable="false" readonly="true"></div> <b><span style="font-weight: bold;">From:</span></b> "boB@midnitesolar.com" <boB@midnitesolar.com><br> <b><span style="font-weight: bold;">To:</span></b> RE-wrenches <re-wrenches@lists.re-wrenches.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Saturday, February 4, 2012 8:05 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [RE-wrenches] Apparent power<br> </font> </div> <br>
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Sounds like a voltage source (and sinking) inverter to me.<br>
<br>
These types can cause current distortion which the UL1741 / IEEE
1547 specs try to prevent.<br>
<br>
Apparent must be able to turn that mode on and off I would
imagine. It's not too difficult to do. No wonder<br>
they talk about micro-grids.<br>
<br>
The old Trace SW series was a voltage source inverter, even when
grid tied and is basically why they had<br>
to add that extra inductor box between SW and the grid when selling.
It could actually help the grid wave-<br>
form voltage if it was distorted because of non-linear loads.<br>
<br>
boB<br>
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On 2/4/2012 5:26 PM, Comet Systems wrote:
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<div>As I understand the issue they claim to be able to address,
the utilities often need a source of reactive power close at the
system delivery points, the customer sites, because reactive
power does not transmit well through the lines and transformers
and uses up transmission resources better used for real power.
The reactive power is used as a method of voltage control. </div>
<div>Therefore, it is reasonable that the utilities would pay a
premium for a reactive power source which would be close to the
customers and under their control. The idea has some merit and
could be a significant direction for solar pv, but whether an
electronic inverter can adequately generate reactive power at
will, to act as a compensation device and whether that is the
highest and best use for that power source is to be
demonstrated. Interesting idea, though.</div>
-- <br>
Chris Mason
<div>President, Comet Systems Ltd</div>
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