[RE-wrenches] Power Quality

[William Miller]

Peter:

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.

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?

William Miller




At 10:43 AM 6/5/2012, Parrish, Peter wrote:
>Content-Language: en-US
>Content-Type: multipart/alternative;
> 
>boundary="_000_C97976CE00E1154DBC70321CCE6BC4B309AF31A6EXCHMBX1StaffCa_"
>
>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?
>
>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?
>
>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
>
>As far as grid-tied is concerned, monitor utility power and provide the 
>same answer for grid-tied inverter.
>
>- 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 at canyons.edu O: (661) 362-3888 C: (323) 839-6108
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20120605/c0ec11a4/attachment-0003.html>