In message <344e0d5f-e79f-fcfa-eba5-4cf50e047...@comcast.net>, Peter Reilley
writes:
>If a solar farm also included a battery bank then they would be able to supply
>VAs along with Watts just like a conventional generator.
The large MW size solar farms can already do that but with capac
In message <006a1c6a-0b2f-16fd-5fef-64352ff14...@earthlink.net>, jimlux writes:
>On 2/9/17 4:03 PM, Poul-Henning Kamp wrote:
>>
>> In message <63beea7a-f9fc-6e1d-b855-2c7056de3...@earthlink.net>, jimlux
>> writes:
>>
>>> I think also of the issues from distributed generation - co
They may well be willing to pay for more expensive equipment because they
can make money from it. large industrial electricity users pay for the VAs
that they use. Even though they are not energy the utility has to
supply them.
The utility charges for this service.
If a solar farm also incl
One issue with power factor corrected power supplies is that in the short
term (as a minimum, at the line frequency), they do behave like resistors
(current goes up when voltage goes up) but as they have a slow voltage
regulation loop to provide regulated output, they do behave like constant
power
Hi,
I know. In practice many of the operators in the US is working together
to get smarter, share experiences and learn from each other and others.
Good folks.
Cheers,
Magnus
On 02/11/2017 04:08 PM, Bob Camp wrote:
Hi
To be fair to these guys, they have a number of challenges that have noth
In message <9fd9beca-832a-4c38-9799-4a31625f7...@n1k.org>, Bob Camp writes:
>Not an easy thing.
Not even close, which is precisely why the "50/60 Hz or bust" mindset
doesn't work any longer.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since
Hi
To be fair to these guys, they have a number of challenges that have nothing to
do with technology. They cross link to other companies and have little control
over how each one operates. Here in the US, we have multiple regulatory
agencies (it happens at the state, federal, and international
Work is already underway to improve the relicense of power grid
operations. They is smarting up quickly. The PMU/synchrophasor
measurements depend on UTC and before it can be used full-blown for
operation the single point of failure needs to be handled.
Cheers,
Magnus
On 02/09/2017 11:19 PM,
Hi Jim,
On 02/09/2017 11:39 PM, jimlux wrote:
On 2/9/17 1:31 PM, Poul-Henning Kamp wrote:
In message
<4fbdd81ddf04fc46870db1b9a747269202916...@mbx032-e1-va-8.exch032.ser
verpod.net>, "Thomas D. Erb" writes:
I was wondering if anyone was familiar with this proposal, is this
a uncoupli
On Thu, 9 Feb 2017 17:19:49 -0500, you wrote:
>Isn't this "hard" lock to UTC creating a single point of failure? A
>solar burst, an EMP, or
>a software error could leave us all in the dark. After all, smart
>inverters could be
>programmed to act like big lumps of rotating iron and be compatibl
On Thu, 9 Feb 2017 19:06:51 -0500, you wrote:
>One simplistic way to look at all this is that a switcher presents a negative
>resistance load. If you drop voltage, current goes up. OCXOs happen
>to share this issue. Negative resistances are *not* what most power source
>guys want in their cont
On Thu, 09 Feb 2017 23:39:24 +, you wrote:
>It is harder than it sounds.
>
>Small solar inverters are the best, they an regulate down at milliseconds
>notice, and many jurisdictions impose asymetric frequency bands on
>them to exploit this.
>
>Big inverters, no matter what you put behind them,
In message <043966d4-def4-4bc4-ba9d-ec46070fd...@comcast.net>, Peter Reilley wr
ites:
>Even in the old days a lot of devices were constant load, independent of
>voltage (within reason).
>Anything regulated such as electric heat, electric hot water, and
>refrigerators are constant load.
Even in the old days a lot of devices were constant load, independent of
voltage (within reason).
Anything regulated such as electric heat, electric hot water, and
refrigerators are constant load.
Synchronous motors (most motors) are frequency dependent. They do get
less efficient at lower
vol
On 2/9/17 4:03 PM, Poul-Henning Kamp wrote:
In message <63beea7a-f9fc-6e1d-b855-2c7056de3...@earthlink.net>, jimlux writes:
I think also of the issues from distributed generation - consider a
rooftop solar installation with 20 or so MicroInverters, all "slaved" to
the line. Just from
Hi
> On Feb 9, 2017, at 6:55 PM, Poul-Henning Kamp wrote:
>
>
> In message
>
> , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes:
>> On 9 February 2017 at 21:31, Poul-Henning Kamp wrote:
>>
>>>
>>> The only other possible "balance signal" is the voltage, and it
>>> suffers from a
In message <63beea7a-f9fc-6e1d-b855-2c7056de3...@earthlink.net>, jimlux writes:
>I think also of the issues from distributed generation - consider a
>rooftop solar installation with 20 or so MicroInverters, all "slaved" to
>the line. Just from manufacturing variations, I suspect each
In message <28842754-1752-40e8-b3d5-f486a5da9...@n1k.org>, Bob Camp writes:
>> to such an extent that many of them are totally
>> incapable of even imagining anything else, and they all just "know"
>> that DC is "impossible”.
>
>Except we’ve had HVDC distribution running around for many d
In message
, "Dr. David Kirkby (Kirkby Microwave Ltd)" writes:
>On 9 February 2017 at 21:31, Poul-Henning Kamp wrote:
>
>>
>> The only other possible "balance signal" is the voltage, and it
>> suffers from a host of noise mechanisms, from bad contacts and
>> lightning strikes to temperat
Hi
If you are talking about big power gizmos, putting a GPSDO on them is pretty
simple
cost and system wise. Given the fact that 10 ns sync is not required, the
actual implementation
might be pretty cheap.
Bob
> On Feb 9, 2017, at 5:19 PM, Peter Reilley wrote:
>
> Isn't this "hard" lock t
In message , Peter Reilley wr
ites:
>Isn't this "hard" lock to UTC creating a single point of failure? A
>solar burst, an EMP, or
>a software error could leave us all in the dark.
Well, to be honest, all of those things would wreck havoc with
any big grid...
The bigger concern is what
> On Feb 9, 2017, at 4:31 PM, Poul-Henning Kamp wrote:
>
>
> In message
> <4fbdd81ddf04fc46870db1b9a747269202916...@mbx032-e1-va-8.exch032.ser
> verpod.net>, "Thomas D. Erb" writes:
>
>> I was wondering if anyone was familiar with this proposal, is this
>> a uncoupling of line frequen
On 2/9/17 1:31 PM, Poul-Henning Kamp wrote:
In message <4fbdd81ddf04fc46870db1b9a747269202916...@mbx032-e1-va-8.exch032.ser
verpod.net>, "Thomas D. Erb" writes:
I was wondering if anyone was familiar with this proposal, is this
a uncoupling of line frequency from a time standard ?
Th
On 9 February 2017 at 21:31, Poul-Henning Kamp wrote:
>
> The only other possible "balance signal" is the voltage, and it
> suffers from a host of noise mechanisms, from bad contacts and
> lightning strikes to temperature, but worst of all, it takes double
> hit when you start big induction motor
Isn't this "hard" lock to UTC creating a single point of failure? A
solar burst, an EMP, or
a software error could leave us all in the dark. After all, smart
inverters could be
programmed to act like big lumps of rotating iron and be compatible with
the current
system.
Pete.
On 2/9/2017 4:3
In message <4fbdd81ddf04fc46870db1b9a747269202916...@mbx032-e1-va-8.exch032.ser
verpod.net>, "Thomas D. Erb" writes:
>I was wondering if anyone was familiar with this proposal, is this
>a uncoupling of line frequency from a time standard ?
The interesting thing about this is that all res
I was wondering if anyone was familiar with this proposal, is this a uncoupling
of line frequency from a time standard ?
The purpose of proposed Reliability Standard PRC-012-2 is to ensure that
remedial action schemes do not introduce unintentional or unacceptable
reliability risks to the bulk
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