power quality problems [RE-wrenches]

[Tom Elliot, Guffey Energy Works]

Actually, this same issue is coming up on Maui as well with about 250MW of 
grid generation capacity and a 30MW windfarm.  The windfarm is contractually 
limited to 10% of the grid but actually winds up providing around 8%.  The 
problem here is that the windfarm has tighter tolerances for frequency 
variation than does the grid and they had to loosen it a bit to keep the 
windfarm from dropping off the grid in response to fluctuations (though keep 
it within acceptable limits) because the windfarm dropping off is what 
really causes grid problems.  Each island is literally an island of power 
unto itself with nothing to buffer usage and supply problems.  If one big 
diesel generator drops offline or the windfarm drops offline there are real 
problems.

Tom


----- Original Message ----- 
From: "Todd Cory, Mt. Shasta Energy Services" <toddcory at finestplanet.com>
Subject: Re: power quality problems [RE-wrenches]



This brings up a question I have long held, namely at what percentage of
renewables being added to an electrical grid, will the ability of the
utility to regulate the grid become ineffective? This is probably what
is going on with the scenario in Hawaii.

Todd

Marco Mangelsdorf wrote:

>We appear to be having power quality issues with our local utility.  I've
>replaced the grid-tie 4 kW inverter twice now and my customer is still
>seeing the bugger trip off-line frequently during the day.  There happens 
>to
>be an 11 MW windfarm not more than 10 miles from the site and I know that
>frequency drift is an issue, so I have widened the frequency window of the
>inverter (with the utility's knowledge and approval).
>
>


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