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Sunday, November 08, 2009

A Problem With Wind Power

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In a recent post critical of Al Gore and his hyperbole about wind turbine generated electricity, I hinted at issue of these generators actually having a parasitic relationship with the rest of the power grid.

You may be interested in the following: A Problem With Wind Power by Eris Rosenbloom and the subsection: Energy consumption in wind facilities.

Among the wind turbine functions that use electricity are the following:†s
  • yaw mechanism (to keep the blade assembly perpendicular to the wind; also to untwist the electrical cables in the tower when necessary) -- the nacelle (turbine housing) and blades together weigh 92 tons on a GE 1.5-MW turbine

  • blade-pitch control (to keep the rotors spinning at a regular rate)

  • lights, controllers, communication, sensors, metering, data collection, etc.

  • heating the blades -- this may require 10%-20% of the turbine's nominal (rated) power

  • heating and dehumidifying the nacelle -- according to Danish manufacturer Vestas, "power consumption for heating and dehumidification of the nacelle must be expected during periods with increased humidity, low temperatures and low wind speeds"

  • oil heater, pump, cooler, and filtering system in gearbox

  • hydraulic brake (to lock the blades in very high wind)

  • thyristors (to graduate the connection and disconnection between generator and grid) -- 1%-2% of the energy passing through is lost

  • magnetizing the stator -- the induction generators used in most large grid-connected turbines require a "large" amount of continuous electricity from the grid to actively power the magnetic coils around the asynchronous "cage rotor" that encloses the generator shaft; at the rated wind speeds, it helps keep the rotor speed constant, and as the wind starts blowing it helps start the rotor turning (see next item); in the rated wind speeds, the stator may use power equal to 10% of the turbine's rated capacity, in slower winds possibly much more

  • using the generator as a motor (to help the blades start to turn when the wind speed is low or, as many suspect, to maintain the illusion that the facility is producing electricity when it is not,‡ particularly during important site tours) -- it seems possible that the grid-magnetized stator must work to help keep the 40-ton blade assembly spinning, along with the gears that increase the blade rpm some 50 times for the generator, not just at cut-in (or for show in even less wind) but at least some of the way up towards the full rated wind speed; it may also be spinning the blades and rotor shaft to prevent warping when there is no wind§
It may be that each turbine consumes more than 50% of its rated capacity in its own operation. If so, the plant as a whole -- which may produce only 25% of its rated capacity annually -- would be using (for free!) twice as much electricity as it produces and sells. An unlikely situation perhaps, but the industry doesn't publicize any data that proves otherwise; incoming power is apparently not normally recorded.
These articles are three years old, so there will be a lot of "yes, but" new technology, etc. Those same "yes, butters" will gladly point to 40-year old fossil fuel or nuclear plants and deride the technology employed therein.

The big difference is that new technologies have been deployed that fix 40-year old problems, but the problems of three years ago remain. It might be worthwhile having some real systemwide analysis for wind turbine electric power generation before following Al Gore's advice and installing the products in which he has investments and is hawking under the guise of the next energy answer.

2012 IS GETTING CLOSER

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There is always an easy solution to every human problem—neat, plausible, and wrong.
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“The Divine Afflatus,” A Mencken Chrestomathy, chapter 25, p. 443 (1949)
... and one could add "not all human problems really are."
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FEDERAL RESERVE & HOUSING

SEARCH BLOG: FEDERAL RESERVE for full versions... or use the Blog Archive pulldown menu.

February 3, 2006 Go back to 1999-2000 and see what the Fed did. They are following the same pattern for 2005-06. If it ain't broke, the Fed will fix it... and good!
August 29, 2006 The Federal Reserve always acts on old information... and is the only cause of U.S. recessions.
December 5, 2006 Last spring I wrote about what I saw to be a sharp downturn in the economy in the "rustbelt" states, particularly Michigan.
March 28, 2007
The Federal Reserve sees no need to cut interest rates in the light of adverse recent economic data, Ben Bernanke said on Wednesday.
The Fed chairman said ”to date, the incoming data have supported the view that the current stance of policy is likely to foster sustainable economic growth and a gradual ebbing in core inflation”.

July 21, 2007 My guess is that if there is an interest rate change, a cut is more likely than an increase. The key variables to be watching at this point are real estate prices and the inventory of unsold homes.
August 11, 2007 I suspect that within 6 months the Federal Reserve will be forced to lower interest rates before housing becomes a black hole.
September 11, 2007 It only means that the overall process has flaws guaranteeing it will be slow in responding to changes in the economy... and tend to over-react as a result.
September 18, 2007 I think a 4% rate is really what is needed to turn the economy back on the right course. The rate may not get there, but more cuts will be needed with employment rates down and foreclosure rates up.
October 25, 2007 How long will it be before I will be able to write: "The Federal Reserve lowered its lending rate to 4% in response to the collapse of the U.S. housing market and massive numbers of foreclosures that threaten the banking and mortgage sectors."
November 28, 2007 FED VICE CHAIRMAN DONALD KOHN
"Should the elevated turbulence persist, it would increase the possibility of further tightening in financial conditions for households and businesses," he said.

"Uncertainties about the economic outlook are unusually high right now," he said. "These uncertainties require flexible and pragmatic policymaking -- nimble is the adjective I used a few weeks ago."
http://www.reuters.com/

December 11, 2007 Somehow the Fed misses the obvious.
fed_rate_moves_425_small.gif
[Image from: CNNMoney.com]
December 13, 2007 [from The Christian Science Monitor]
"The odds of a recession are now above 50 percent," says Mark Zandi, chief economist at Moody's Economy.com. "We are right on the edge of a recession in part because of the Fed's reluctance to reduce interest rates more aggressively." [see my comments of September 11]
January 7, 2008 The real problem now is that consumers can't rescue the economy and manufacturing, which is already weakening, will continue to weaken. We've gutted the forces that could avoid a downturn. The question is not whether there will be a recession, but can it be dampened sufficiently so that it is very short.
January 11, 2008 This is death by a thousand cuts.
January 13, 2008 [N.Y. Times]
“The question is not whether we will have a recession, but how deep and prolonged it will be,” said David Rosenberg, the chief North American economist at Merrill Lynch. “Even if the Fed’s moves are going to work, it will not show up until the later part of 2008 or 2009.”
January 17, 2008 A few days ago, Anna Schwartz, nonagenarian economist, implicated the Federal Reserve as the cause of the present lending crisis [from the Telegraph - UK]:
The high priestess of US monetarism - a revered figure at the Fed - says the central bank is itself the chief cause of the credit bubble, and now seems stunned as the consequences of its own actions engulf the financial system. "The new group at the Fed is not equal to the problem that faces it," she says, daring to utter a thought that fellow critics mostly utter sotto voce.
January 22, 2008 The cut has become infected and a limb is in danger. Ben Bernanke is panicking and the Fed has its emergency triage team cutting rates... this time by 3/4%. ...

What should the Federal Reserve do now? Step back... and don't be so anxious to raise rates at the first sign of economic improvement.
Individuals and businesses need stability in their financial cost structures so that they can plan effectively and keep their ships afloat. Wildly fluctuating rates... regardless of what the absolute levels are... create problems. Either too much spending or too much fear. It's just not that difficult to comprehend. Why has it been so difficult for the Fed?

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Michigan, United States
Air Force (SAC) captain 1968-72. Retired after 35 years of business and logistical planning, including running a small business. Two sons with advanced degrees; one with a business and pre-law degree. Beautiful wife who has put up with me for 4 decades. Education: B.A. (Sociology major; minors in philosopy, English literature, and German) M.S. Operations Management (like a mixture of an MBA with logistical planning)