Category Archives: Grids & Networks

The Celestial Shooting Gallery, Part Four: “You Have Nothing to Worry About (click) Worry About (click) Worry About (click)…”

Stability Model of an experimental distribution grid

A stability map of a simple power grid. Each point on this image represents an operating state of a simple power grid consisting of a few generators. Bluish regions constitute stable working states, red unstable and ‘salt-and-pepper’ represent chaotic behavior. One can tune a grid for stability by controlling the phasing of generators and transformers on the grid and such settings suffice for day-to-day operations. It is difficult to decide where, or by how much, abnormalities such as geomagnetic storms might push a system into red, unstable regions, or, worse, salt-and-pepper regions where the system oscillates between states. It is easy to find cases on the map where chaotic regions lie very close to stable regions, indicating that the destabilizing push need not be large at all. James Thorp, Cornell University, published in IEEE Spectrum

People paid to worry about the North American power grid regard geomagnetic storms as “high impact, low-frequency” events, spawning the inevitable acronym: HILF. Low frequency, in that a geomagnetic storm as intense as May 1921, at 5,000 nano-Teslas/minute, or the 1859 Carrington Event, best guess: 7,500 nano-Teslas/minute, might not happen in our lifetimes, the lifetimes of our children, or even our grand children. If signature traces in Arctic ice core samples are correct, these are ‘500 year events.’ When it comes to deciding where to put that preventative maintenance dollar, storm-proofing Oklahoma elementary schools against EF 5 tornadoes seems a far more practical spend than the hardening of electrical grids against a half-theoretical event that might not even happen in 500 years.

What pulls planners up short is the high impact part: the utter god-awfulness of a power grid that crashes and which then can’t boot itself up. There is a self-referential dependency: fixing a dysfunctional power grid requires it to be functional, as key aspects of the manufacturing of transformers need electricity.

Nor can one expect the cavalry to ride in anytime soon, as the vast geographic reach of geomagnetic storms means that one strong enough to take down the North American grid may very likely take down Eurasian grids as well – entire hemispheres could wind up in the toilet, and we only have two hemispheres. That and the statistical variableness to it all: the Carrington 1859 and May 1921 storms, nominally two ‘500 year events’ were, in fact, separated by only sixty-two years.

Where does the buck stop? Continue reading →

Celestial Shooting Gallery, Part Three: When a CME Hits the Atmosphere

Failed GSU transformer at Salem River, NJ

A Generator Step Up (GSU) transformer failed at the Salem River Nuclear Plant during the March 1989 geomagnetic storm. The unit is depicted on the left; some of the burned 22kV primary windings are shown on the right. Though immersed in cooling oil, the windings became hot enough to melt copper, at about 2000 degrees F. John Kappenman, Metatech

Coronal Mass Ejections are mainly charged particles, protons and electrons. When a CME arrives at Earth, the charged protons and electrons come under the influence of the Earth’s own magnetic field, the magnetosphere. Charged particles spin around the lines of magnetic force that comprise the magnetosphere, which diverts most of CME harmlessly around the planet, keeping Earth’s surface tranquil.

If the ejection is large enough, however, it can distort the shape of the magnetosphere, occasionally causing magnetic flux lines to snap and reconnect. When this happens, charged particles leak in and follow the magnetosphere’s flux lines down to the Earth’s ionosphere. There, they strike oxygen and nitrogen molecules and strip them of electrons. These ionized gases glow, giving rise to the ethereal beauty of the auroras around the north and south poles. Unfortunately, these excess charged particles also produce immense electrojets.

Continue reading →

Celestial Shooting Gallery, Part Two: The Physics of Geomagnetic Storms

On August 31, 2012 a long filament of solar material that had been hovering in the sun’s atmosphere, the corona, erupted out into space at 4:36 p.m. EDT. The coronal mass ejection, or CME, traveled at over 900 miles per second. The CME did not travel directly toward Earth, but did connect with Earth’s magnetic environment, or magnetosphere, causing aurora to appear on the night of Monday, September 3. The image above includes an image of Earth to show the size of the CME compared to the size of Earth. NASA Goddard Spaceflight Center

Thursday, May 2nd, 2013, a coronal mass ejection (CME) hurled nearly one billion tons of charged particles from the sun’s corona at an outward velocity of one million miles per hour – 270 miles per second.

In less than a half hour, 2,700 virtual Empire State Buildings, 340,000 tons apiece – give or take a few gorillas – erupted from an active region of the Sun’s surface called AR1748, a northern latitude sunspot. AR1748 had just become visible on the western limb of the Sun’s surface when it ejected this mass, so the vast bulk of it hurled outward, not toward us in Libra, but more or less toward Cancer, at right-angles to us. In practical terms, it shot wide of its mark. Still an impressive shot. The CME had been triggered by an M class solar flare, the second largest in a five step scheme (An, Bn, Cn, Mn, Xn; for n a relative magnitude). It had been the largest coronal mass ejection observed thus far in 2013.

And it was still early in the day for AR1748.

Continue reading →

Celestial Shooting Gallery, Part One: The Day We Lost Quebec

John Kappenman reconstructed the electrojets which formed in the ionosphere late in the March 13, 1989 geomagnetic storm which compromised the Hydro-Quebec power grid in Canada. Concurrently, the eastward jet induced ground currents that severely strained the electrical distribution grid of northern continental United States, resulting in a transformer failure at the Salem Nuclear Power Plant, in New Jersey. Courtesy of Metatech

Nearly a quarter century ago, on March 13, 1989, a geomagnetic storm led to the collapse of the Hydro-Quebec electrical grid system, which furnishes power to much of the province of Quebec, Canada. So pervasive were abnormal currents, that protective circuit breakers tripped throughout the system, bringing the entire grid to a halt in about one and a half minutes. The grid’s self-protective systems were geared toward local abnormalities happening in particular places. In contrast, ground induced currents created abnormalities everywhere. The good news was that most of the hardware protected itself. The bad news was that six million customers were without power for as long as nine hours, and where transformer damage did occur, outages continued for another week.

Further south, the United States experienced a close shave. A second surge in the March 13 storm generated similar ground induced currents in the northern United States, with large current spikes observed from the Pacific Northwest to the mid-Atlantic states, one spike destroying a large GSU transformer at the Salem Nuclear Power Plant in New Jersey. According to John Kappenman, of the Metatech Corporation “It was probably at this time that we came uncomfortably close to triggering a blackout that could have literally extended clear across the country.”

Continue reading →

The limits of network security: tension between convenience and safety

Map of Queensland, Australia

Long ago, 2000, and far away, in Australia, a malevolent hacker targeted the sewerage system. Courtesy of the site AssembleIt.Net, excerpted from Australia’s Hacked History

In April 2000 a man, Vitek Boden was arrested and charged with offences relating to the unlawful entry into Maroochy Shire Council’s sewerage system and environmental damage. His attack via wireless technology altered electronic data that led to malfunctions of the sewerage system. This caused a clean up cost of $13,110 and untold damage to the environment. The Crown’s case against Boden relied heavily on circumstantial evidence which exposed several areas for criticism for the defendant.

Continue reading →

Solar-powered parking meter

Urban Planning: A brief history of the Minneapolis skyways

Posted in its entirety from Jason Kottke’s blog. We did not know about this system, but think it’s worth considering for a number of reasons: it gets people walking in inclement weather rather than taking their vehicles or not travelling at all; probably stops the weather from entirely shutting down Minneapolis, and, to the extent it’s reducing vehicle and pedestrian traffic, likely reducing accidents, property damage, death and injury. An example of excellent urban transportation planning.

A brief history of the Minneapolis skyways

If you’ve ever been to downtown Minneapolis, you’ve likely used the large network of above-grade covered walkways that now stretches into nearly every corner of the downtown area. I’d always assumed they were built to help downtown workers and residents avoid cold weather during the winter, but that’s not the case.

Rather, the skyway system originally emerged from a twofold desire. First, planners in the 1940s and 50s were very concerned about managing increasingly dense pedestrian flows, and viewed skyways as a way to maximize the use of urban space for both people and automobiles (Byers 1998 154). Second, business owners were interested in maximizing their property values, and saw the skyways an opportunity to double the amount of valuable retail space in their downtown buildings (Byers 1998 159).

I used to work in downtown Minneapolis, and the skyways were great in the winter. To be able to take a walk and get lunch without having to bundle up in coat, hat, mittens, scarf, etc. was almost like living in a warm climate…and that’s no small thing during a long, dark Mpls winter. (via ?than)

via kottke.org – home of fine hypertext products.

We’re aware of the Chicago system of underground streets, the abandoned postal tube systems in the United States and others (See, e.g. Multilevel streets in Chicago – Wikipedia, the free encyclopedia). To the extent we’ve failed to exploit these opportunities, or used and abandoned them, they constitute wasted assets. See also Minneapolis Skyway System (Wikipedia entry); Leif Petterson’s Take the Skyway on Vita.MN (The Twin Cities Going-Out Guide).

Bob Gohn/Pike Research: The Class Warfare of Dynamic Pricing

Excerpted from The Class Warfare of Dynamic Pricing, by Bob Gohn, on the Pike Research Blog

Dynamic pricing for electricity has long been the holy grail of the smart grid, particularly for smart metering. The rationale is that if the retail price of electricity actually reflected the true time-based costs instead of a blurred monthly average, then consumers would become more efficient buyers, benefiting themselves, suppliers, the environment, and society. If we can choose to buy less during demand peaks when generation costs are highest, and buy more when the grid is underutilized, then overall electricity bills will go down, peak demand is reduced, and the associated environmental impacts are lessened. Everyone wins – so who’s to complain?

Well, quite a few consumer interest groups are complaining, ranging from the AARP to utility watchdog groups. While some complaints fit within the ongoing smart metering paranoia, there are legitimate concerns as well, including:

Low-income, elderly, and other disadvantaged groups may not be able to shift to off-peak use, and hence may face higher bills. Images of grandma turning off her oxygen, shivering in the cold or sweating out a heat wave because of smart meters are persuasive.

There is a general assumption that consumers will happily make “comfort vs. cost” tradeoffs in energy use. This is counter to the trend toward flat rate pricing elsewhere, including the telecom industry, heretofore the master of time-of-use pricing.

While there is little argument against “opt-in” dynamic pricing programs, most agree that dynamic pricing must be mandatory or implemented as an “opt-out” program to achieve the desired benefits. This muddles the message of enabling “consumer choice” via smart metering.

Underlying all these concerns is an assumption that for someone to win with dynamic pricing, someone else has to lose. The goal may be to reduce demand peaks and fill underutilized valleys, effectively lowering the average, but it is true that some will likely pay more with dynamic rates. The question is who?

Interestingly, opposition to dynamic pricing can be found on both ends of our politically polarized spectrum. Those toward the right fear Big Brother taking control of their thermostats and appliances (here, utilities = government). Those bent leftward see the social good of universal electricity being corrupted, leaving the vulnerable unprotected (here, utilities = big business). I am sure smart grid advocates would love to unite Tea Party and Occupy Wall Street folks, but not this way!

You can read the rest of The Class Warfare of Dynamic Pricing, by Bob Gohn, on the Pike Research Blog. We make only this observation – when uneven distribution of wealth is so extreme that the less-fortunate suffer morbidity and mortality for want of adequately efficient shelter, protection from extremes of temperature, the unevenness of that wealth distribution – it matters not whether we’re talking about housing stock and its efficiency, or energy to heat or cool it, we are inclined to set aside ideology, and find ways to insulate houses, provide clean and warm clothing and food, and prohibit energy companies from executing non-payment shutoffs absent a court order. We can then discuss ideology, or yell at each other, or do what passes for political discourse these days – later. If this makes me intellectually dishonest, I’ll take the weight for that.

Brookings, SAP, NRG, and the City of New York on our Energy Future

NRG Energy

Tweet Will moving to the new energy future – deploying Solar, Wind and other sustainable alternatives create 2.7 Million New Jobs?

At “How Cities and Companies Can Work Together to Operate in the New Energy-Constrained Economy” a panel discussion (press release), Bruce Katz, Vice President and Director of the Metropolitan Policy Program, Brookings Institution, said “2.7 million new jobs” will be created in moving to the clean energy / low carbon economy.

Mr. Katz also noted that two out of three Americans – 200 million people – live in the 100 biggest metropolitan areas, and those 200 million people are responsible for 75% of our GDP. High carbon energy is no longer cheap. The people in those metropolitan areas, and elsewhere, therefore, must act. Continue reading →

Alan Sorum on appropriate power technology in Alaska

From Alan Sorum’s essay, Appropriate Use of Technology for Power Generation in Alaska.

Alaska does not currently support large-scale electric utilities. There also needs to be a minimal number of customers served by each power line to justify its construction. Weather can be severe and cause failures in the system. This increases costs and accessibility for repairs. Many residents live beyond the economical limits of connection to commercial electric utilities.

Small-scale power systems in rural Alaska offer potential improvements in power distribution, generation and efficiency.

Distribution performance can be improved by the use of small-scale power generators. Smaller generators can be placed much closer to the actual point of consumption. Disruptions to the power supply are reduced and access for line repairs is much easier. Short power lines lose less power in transmission, and the power delivered is “cleaner”, since there are fewer opportunities for broken insulators and lightning storms.

Gas or diesel fired co-generation produces power efficiently, utilizing fuel cells and waste heat for community needs. Hybrid generation systems feature a primary generator, powered by diesel, natural gas. wind or hydro. A computerized inverter allows the primary to charge large banks of storage batteries. During periods of low consumption, the generator shuts down and the system runs off of power from the batteries. Trace Engineering builds a system like this that also allows wind or small hydro to charge the batteries.

Saving energy within a household has the greatest impact on the overall costs for an entire system. There are many ways to save energy in a household. These include super-insulation, using energy efficient light bulbs and appliances, installing high-performance windows and improved conservation techniques.

Rural residents are vulnerable to high costs of power, poor weather conditions, power distribution failures and lack of available support services. The rural versus urban appropriation of state resources will continue to generate debate in Alaska. It is likely funds provided for the power cost equalization program will continue to decline.

Small-scale power generation systems that utilize renewable energy resources could be a bright spot in the future of Alaska. Rural residents can expect improvements to their quality of life with the advent of affordable and reliable electrical power. Using appropriate technology for power generation and distribution makes good sense for the natural capitalists living in rural areas of our state.

Alaska is an extreme example of the necessity of distributing, decentralizing, or localizing power grids – and making consumption as frugal as possible.

Popular Logistics found Sorum’s essay on Google’s Knol system. We think it may have been first published on Suite101.com.

Mr. Sorum has also written good pieces on marine safety and emergency communications, which we hope to excerpt in the near future.