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Grid matters

dspp
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Grid matters

#259074

Postby dspp » October 20th, 2019, 11:55 am

I was aware of this, which is now being reported.

https://www.theguardian.com/uk-news/201 ... d-troubles

I'm pretty sure I have seen it reported before. Their plans were were extremely credible. Anyway this and similar issues probably deserve a thread of their own.

regards, dspp

dspp
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Re: Grid matters

#259087

Postby dspp » October 20th, 2019, 1:15 pm

ReallyVeryFoolish wrote:More convenient, more impact, arguably easier and less risk of being caught blowing up major substations, I'd have thought? But then again, who knows how terrorists think about stuff.


The plans I saw actually were for the major HV substations, just as you suggest. I think to journalists this is what they call a "power station".

regards, dspp

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Re: Grid matters

#259125

Postby supremetwo » October 20th, 2019, 4:18 pm

It is in the BBC documentary series, Spotlight on the Troubles: A Secret History

https://www.bbc.co.uk/programmes/m0008c4b

Though the cynic in me wonders at the timing of its transmission - a Brexit frightener?

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Re: Grid matters

#259372

Postby XFool » October 21st, 2019, 10:32 pm

dspp wrote:The plans I saw actually were for the major HV substations, just as you suggest. I think to journalists this is what they call a "power station".

There is course one such - connecting North London to the grid - quite near to the old Inglis Barracks in North London, which the IRA bombed in 1988.
Last edited by XFool on October 21st, 2019, 10:37 pm, edited 3 times in total.

XFool
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Re: Grid matters

#259373

Postby XFool » October 21st, 2019, 10:34 pm

supremetwo wrote:It is in the BBC documentary series, Spotlight on the Troubles: A Secret History

https://www.bbc.co.uk/programmes/m0008c4b

Though the cynic in me wonders at the timing of its transmission - a Brexit frightener?

Groan!

dspp
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Grid matters

#346296

Postby dspp » October 8th, 2020, 7:54 pm

courtesy JohnKempReuters

The value of international electricity trading

(Ofgem) commissioned University College
London (UCL) in May 2019 to conduct research regarding cross-border electricity trading
between Great Britain and connected European Union markets,

https://www.ucl.ac.uk/bartlett/sustaina ... _final.pdf

- dspp

dspp
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Re: Grid matters

#347854

Postby dspp » October 15th, 2020, 6:30 am

National Grid warns of short supply of electricity over next few days
System operating at reduced capacity due to low wind speeds and unplanned power plant outages

“Unusually low wind output coinciding with a number of generator outages means the cushion of spare capacity we operate the system with has been reduced,” the company told its Twitter followers.

“We’re exploring measures and actions to make sure there is enough generation available to increase our buffer of capacity.”

A spokeswoman for National Grid said the latest electricity supply squeeze was not expected to be as severe as recorded last month, and added that the company did not expect to issue an official warning in the next 24 hours.



etc

https://www.theguardian.com/business/20 ... t-few-days

- dspp

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Re: Grid matters

#348204

Postby 88V8 » October 16th, 2020, 10:52 am

As we get more 'renewables' we're going to need an awful lot of batteries for those days when the wind don't blow and the sun don't shine.
It would be nice to think that some panjandrum has a strategic plan for the alignment of greening and storage.

V8

dspp
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Re: Grid matters

#376647

Postby dspp » January 13th, 2021, 4:17 pm

Thread updated to be "Grid matters", dspp

dspp
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Re: Grid matters

#376649

Postby dspp » January 13th, 2021, 4:20 pm

If you recall the outage last year in mostly eastern England this is one of the matters arising, dspp

(courtesy JohnKempReuters)

new inertia measurement tools planned for Great Britain’s electricity system

https://www.nationalgrideso.com/news/so ... ity-system

-----
11th December 2020 - Balancing the grid

As Electricity System Operator it’s our job to keep the grid stable, including managing its key properties such as voltage or frequency – and, increasingly, levels of something called inertia.

Our electricity control room is developing two new tools to manage this key characteristic – part of a pioneering world first approach to measuring and managing power grid inertia.

In this blog, the Head of our Control room Rob Rome explains more.

First things first – what is inertia?
If you look in the dictionary, inertia is defined as an object’s tendency to continue in its existing state of rest or motion. In other words, it stays still if it’s still, or keeps it moving if it’s moving. For moving objects, only an external force (like friction) will make it stop.

This makes inertia incredibly important to the stable operation of the electricity system. Many generators producing electricity for the grid have spinning parts – they rotate at the right frequency to help balance supply and demand, and then can spin faster or slower if needed.

The kinetic energy ‘stored’ in these spinning parts is our system inertia. If there’s a sudden change in system frequency, these parts will carry on spinning – even if the generator itself has lost power – and will slow down that change (what we call the rate of change of frequency) while our control room restores balance.

Inertia behaves a bit like the shock absorbers in your car’s suspension, which dampen the effect of a sudden bump in the road and keep your car stable and moving forward.

What’s the new approach?
The calculations we currently use for inertia management (monitoring which transmission-connected generators are running and adding an estimate of inertia from embedded generation and demand) help make our system one of the most reliable in the world.

However, the increase in renewable generation means this is becoming more complex and it’s important we continue to plan for the future. Working in partnership with Reactive Technologies and GE Digital we have developed two new approaches due to go live in our electricity control room in the coming months.

dspp
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Re: Grid matters

#376685

Postby dspp » January 13th, 2021, 5:43 pm

"NREL and several collaborating institutions have published the Research Roadmap on Grid-Forming Inverters, a comprehensive guide to understanding inverter-dominated power systems.

The roadmap provides a system-wide perspective on the integration of inverter-based resources. The report distinguishes between grid-following inverter controls, which depend on traditional generation to operate, and grid-forming measures, which enable inverters to operate flexibly within either hybrid or 100% inverter-based power systems. Although grid-following controls are more commonplace, the roadmap explores the needs and next steps toward implementing grid-forming inverter controls and capabilities, which are expected to define future power systems."

https://www.tdworld.com/test-and-measur ... 6625890F1B

https://www.nrel.gov/docs/fy21osti/73476.pdf

- dspp

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Re: Grid matters

#376716

Postby scotview » January 13th, 2021, 6:50 pm

dspp,
Interesting nrel document, a wee glimpse at our future. Will grid forming inverter systems put more responsibility on consumers or suppliers for power factor correction? PF and it's correction seems to be important for stability and to wring every ounce of juice out of a grid that may rely on battery storage during low generation periods.

But maybe I have misunderstood.

dspp
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Re: Grid matters

#379579

Postby dspp » January 22nd, 2021, 11:22 am

"A new high-voltage subsea cable linking the UK to France has begun importing enough electricity to power 1m British homes. The delayed power cable, which is the second interconnector linking the UK to France, will stretch 149 miles along the seafloor between Hampshire in the UK and Normandy in France. The interconnector, known as IFA2, is expected to meet about 1.2% of Britain’s electricity demand"

https://www.theguardian.com/business/20 ... lectricity

- dspp

dspp
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Re: Grid matters

#380599

Postby dspp » January 25th, 2021, 1:46 pm

"National Grid should lose role as electricity system operator, says Ofgem
Regulator says there could be conflict of interest in company also owning energy networks"


https://www.theguardian.com/business/20 ... y-networks

1. If there is a conflict of interest then why has it taken Ofgem 30-years to notice ?

"Jonathan Brearley, the chief executive of Ofgem, said: “The energy system needs to go undergo the biggest transformation in over a century to meet Britain’s ambitious climate goals. Ofgem is recommending the creation of an independent body to help deliver the fundamental changes in how we use energy.”"

2. er, the people who are supposed to do that are called Ofgem .........

3. This all smacks of inserting another layer of deniability and incompetence and lucrative patronage posts between the politicians responsible, and the realities of engineering & economics.

Plus ca change,

dspp

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Re: Grid matters

#380626

Postby Urbandreamer » January 25th, 2021, 2:59 pm

dspp wrote:2. er, the people who are supposed to do that are called Ofgem .........

3. This all smacks of inserting another layer of deniability and incompetence and lucrative patronage posts between the politicians responsible, and the realities of engineering & economics.

Plus ca change,

dspp


Let us be clear. We are talking about the people who in Jun 2019 said "We've cut £8bn from companies spending plans, because we don't think they've justified their proposals are value for money". (RIIO-2 Draft Determinations)

Then in August that year we had extensive power cuts.

Of course this was because the likes of NG were not doing enough, according to Mr Brearley.

“As the energy market changes, it is vitally important we future-proof the networks to ensure consumers continue to benefit from one of the most reliable electricity systems in the world.”

https://eandt.theiet.org/content/articl ... power-cut/

One wonders how they should do that without spending money.

A while ago (it was on the HYP board) I commented that I had sold my SSE on shares 22 July 2020 because the writing was on the wall then. Ofgem wants to make the decisions then blame and fine those who must comply.

dspp
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Re: Grid matters

#381537

Postby dspp » January 28th, 2021, 1:35 pm

ENTSO-E : System separation in the Continental Europe Synchronous Area on 8 January 2021 – 2nd update
"On 8 January 2021 at 14:05 CET the synchronous area of Continental Europe was separated into two parts due to outages of several transmission network elements in a very short time. ENTSO-E has published the first information on the event already on 8 January 2021, followed by an update with geographical view and time sequence on 15 January 2021. Since then, ENTSO-E has analysed a large portion of relevant data aiming to reconstruct the event in detail. This second update presents the key findings of detailed analyses, which have a preliminary character subject to new facts, which will emerge in the still ongoing investigation."

https://www.entsoe.eu/news/2021/01/26/s ... nd-update/

- dspp

dspp
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Re: Grid matters

#383809

Postby dspp » February 5th, 2021, 9:41 am

The microgrid holy grail of the libertarians remains mudstuck, expect to hear more about VOR along with intermittency

"Attempts to Commercialize Microgrids Fall Short in California
Too little is being done to effectively address the widespread needs of California communities before the next fire season."


"Importance of valuing resilience [Value Of Resilience, VOR]
From the beginning of the proceeding, the Clean Coalition, a California nonprofit, has taken a position during the comment process that the success of microgrids as technology is incumbent on developing a standardized VOR. Other parties concur. Since resilience is one of the main benefits a microgrid provides an end-user, it is undoubtedly a primary reason for deploying a microgrid. But without a proper methodology in place to quantify VOR, that value has been assumed to be zero — so it has not been accounted for when determining if a microgrid is economically feasible."


https://www.tdworld.com/microgrids/arti ... 7613890F7N

and

https://clean-coalition.org/news/elusiv ... uantified/

etc, dspp

dspp
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Re: Grid matters

#387041

Postby dspp » February 15th, 2021, 7:04 pm

US continental supergrid nobbled by Trump
https://www.theatlantic.com/politics/ar ... on/615433/

(I'm sure I posted some of that first Seams study on TLF a few years ago. Anyway, good news is that NREL is hiring again.)

- dspp

dspp
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Re: Grid matters

#391407

Postby dspp » March 2nd, 2021, 10:13 am

courtesy JohnKempReuters a link to a historical piece on the 50Hz vs 60Hz thing

https://www.djtelectricaltraining.co.uk ... quency.pdf

My memory is that Japan is even more complex than depicted. I seem to recall two different voltages leading to in effect three different zones.

regards, dspp

dspp
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Re: Grid matters

#391490

Postby dspp » March 2nd, 2021, 12:27 pm

Ofgem faces National Grid challenge over energy earnings plan
Other network companies including Scottish Power and SSE also expected to take on regulator

etc https://www.theguardian.com/business/20 ... nings-plan

- dspp


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