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Peter:<br><br>
Excellent topic. Just two weeks ago I was working on two Xantrex
XW6048 inverters connected to identical Kohler RES15 generators.
One inverter would connect to the generator, one would not. I
looked at the waveform with a very old, very cheap service scope.
The waveforms from both generators looked triangular.<br><br>
I looked at the waveform at an on-grid location and the waveform looked
triangular, but less so. Now I can't trust my scope. I ask
the same question you are: What tool do we use to check power
quality? Can we judge a sine wave by it's appearance?<br><br>
William Miller<br><br>
<br><br>
<br>
At 10:43 AM 6/5/2012, Parrish, Peter wrote:<br>
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Content-Type: multipart/alternative;<br>
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<font size=2>I would like to follow up on a discussion of under what
conditions an anti-islanding compliant inverter would have problems with
the utility power quality and off grid inverters would have with
generator-derived power quality. I think that Bill Brooks pointed to a
document a while ago about specific transient events, and we all know (or
should know) the +/- 10% VAC and +/- 0.1 Hz requirements. Bill would you
be so kind as to point us there again? <br><br>
What I would like to understand is the following: Is there a power
quality analyzer (e.g. Fluke 430 Series II) out there can asses power
quality and predict compatibility with the various grid-tied and off grid
inverters? <br><br>
As far as off-grid inverters are concerned, what I imagine is a follows:
-- Fire up a generator (e.g. Honda Eu3000iS), load it down with a
reasonable resistive load (e.g. 1,500 kW), and look at VAC, freq,
harmonic distortion, transient events -- and come up with a way to assess
whether or not an off-grid inverter would work with the
generator<br><br>
As far as grid-tied is concerned, monitor utility power and provide the
same answer for grid-tied inverter.<br><br>
- Peter Parrish Peter T. Parrish, Ph.D., Chair Alternative Energy
Department, College of the Canyons Room 700F 17200 Sierra Hwy. Santa
Clarita, CA 91351 peter.parrish@canyons.edu O: (661) 362-3888 C: (323)
839-6108</font></blockquote></body>
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