Posted by Eeyore on April 3, 2009, 3:16 am
Alistair Gunn wrote:
> In alt.energy.renewable vaughn twisted the electrons to say:
> > > You can predict when a convential plant's going to need to be shut down
> > > for maintenance, you can't (necessarily) predict when it might end up
> > > shut down for other reasons :-
> > Whoa! Temporarily borrowing energy from privately owned vehicle
> > batteries *might* be useful to help bridge a momentary peak in energy
> > demand, but it would do nothing to bridge a longer-term maintenance outage.
> <nods> But I never suggested that you could use EV batteries to do that,
> I was merely commenting on the suggestion that only wind/solar had
> unpredictable outages!
> Using EV batteries as a grid power storage medium it not totally without
> merit, but I think there are much better ways of achieving the same goal
> such as Dynamic Demand.
WTF is 'dynamic demand' ?
Graham
Posted by Alistair Gunn on April 3, 2009, 11:12 am
In alt.energy.renewable Eeyore twisted the electrons to say:
> > Using EV batteries as a grid power storage medium it not totally without
> > merit, but I think there are much better ways of achieving the same goal
> > such as Dynamic Demand.
> WTF is 'dynamic demand' ?
Have all large domestic electrical draws monitor the incoming power, and
adjust down (temporarily) how much power they're consuming if the grid
frequency is dropping. This is already done, albeit on a much larger and
less finely grained manner <http://en.wikipedia.org/wiki/Reserve_service> .
--
These opinions might not even be mine ...
Let alone connected with my employer ...
Posted by vaughn on April 3, 2009, 2:03 pm
>> WTF is 'dynamic demand' ?
> Have all large domestic electrical draws monitor the incoming power, and
> adjust down (temporarily) how much power they're consuming if the grid
> frequency is dropping. This is already done, albeit on a much larger and
> less finely grained manner <http://en.wikipedia.org/wiki/Reserve_service> .
It IS being done in a finely grained manner in some areas. Here in Florida,
I can get a slightly reduced electric rate if I allow FP&L to install a
relay that will shut off my water heater and central AC (if necessary) for a
few minutes each hour. Most folks would never notice the difference The
system connects to the phone line via a modem. (I can't take advantage of
that deal because 1, I have gas DHW, and 2) conserve by using window units
in conjunction with my centtral AC).
On a larger scale, our Regional Sewage Plant gets a significant reduction in
power rate by agreeing to "throw the switch" and operate off of their own
turbo-generators in times of peek demand. .
Vaughn.
Posted by Eeyore on April 5, 2009, 10:27 pm
vaughn wrote:
> The system connects to the phone line via a modem.
NOT by varying the frequency of the mains I note.
Graham
Posted by Bill Carter on April 4, 2009, 4:24 am
Eeyore wrote:
>
> Alistair Gunn wrote:
>
>> In alt.energy.renewable vaughn twisted the electrons to say:
>>>> You can predict when a convential plant's going to need to be shut down
>>>> for maintenance, you can't (necessarily) predict when it might end up
>>>> shut down for other reasons :-
>>> Whoa! Temporarily borrowing energy from privately owned vehicle
>>> batteries *might* be useful to help bridge a momentary peak in energy
>>> demand, but it would do nothing to bridge a longer-term maintenance outage.
>> <nods> But I never suggested that you could use EV batteries to do that,
>> I was merely commenting on the suggestion that only wind/solar had
>> unpredictable outages!
>>
>> Using EV batteries as a grid power storage medium it not totally without
>> merit, but I think there are much better ways of achieving the same goal
>> such as Dynamic Demand.
>
> WTF is 'dynamic demand' ?
Its something that you could have found out about with a simple google
search.
> > > You can predict when a convential plant's going to need to be shut down
> > > for maintenance, you can't (necessarily) predict when it might end up
> > > shut down for other reasons :-
> > Whoa! Temporarily borrowing energy from privately owned vehicle
> > batteries *might* be useful to help bridge a momentary peak in energy
> > demand, but it would do nothing to bridge a longer-term maintenance outage.
> <nods> But I never suggested that you could use EV batteries to do that,
> I was merely commenting on the suggestion that only wind/solar had
> unpredictable outages!
> Using EV batteries as a grid power storage medium it not totally without
> merit, but I think there are much better ways of achieving the same goal
> such as Dynamic Demand.