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:
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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 [email protected] O: (661) 362-3888 C: (323) 839-6108
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