Category Archives: Uncategorized

Control of the prime mover, governors, how it is done and why it matters

The previous article described the relationship between power imbalance and rate of frequency change for the first few seconds after a disturbance in power balance. Important as those few seconds are, the few seconds of energy being provided by the … Continue reading

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Frequency stability and energy balance. A description of the interaction between frequency and grid energy flow.

In an earlier post I gave a definition of a stable power system. A stable power system is one that continuously responds and compensates for power/ frequency disturbances, and completes the required adjustments within an acceptable timeframe to adequately compensate … Continue reading

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Generator types; synchronous versus asynchronous. What goes on inside the machines?

There are two main types of alternating current machine used for the generation of electricity; synchronous and asynchronous.  The difference between them begins with the way the magnetic field of the rotor interacts with the stator.  Both types of machine … Continue reading

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Energy balance, imbalance and a definition of grid stability

The previous article described the grid as having no energy storage, and indeed there is no useful storage in the grid itself.  However, there is energy storage in the form of rotating kinetic energy of certain generators, and the quantity … Continue reading

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Electric current is generated ‘on demand’. There is no stored electric current in the grid.

Here’s the second article in the series on electric power system stability: The electric current delivered when you turn on a switch is generated from the instant you operate the switch. There is no store of electric current in the … Continue reading

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The Decadal Global Climate Bet – Now at the half way mark

Updated to December 2015 (month 60/120): We’re now at the half way mark; and the present decade is still running cooler than the preceding decade. The average temperature anomaly for the previous decade is 0.202 C. The average temperature anomaly … Continue reading

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The Decadal Global Climate Bet – October 2015 Update

Updated to October 2015 (month 58/120): The present decade is still running cooler than the preceding decade. I wonder when we’ll begin to see the heating effect of the big El Nino? There’s not much sign of it yet. More … Continue reading

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The Decadal Global Climate Bet – Dec 2014 update, 4 years into the race

Four years ago, early 2011, a decadal global temperature bet was made. And with all the hype about 2014 being the hottest year, now is a good time to check out progress with ‘the bet’. But first a little background … Continue reading

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A Decadal Global Climate Bet – a second view of the race

About six months ago I posted a short article and a graph attempting to show the progress of a global decadal climate bet.  The graph compared the temperature of the two decades Jan 2001 through Dec 2010 and Jan 2011 … Continue reading

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Earth hour poetry

A friend wrote a poem about earth hour which I thought was worth sharing.  Very succinct.  So with thanks to Mike Smith for allowing me to share ‘By Cripes’ with you: By cripes, these days it’s really quite confusing Trying to decide … Continue reading

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