Category Archives: Electricity

Analysis of an under frequency event

Let’s take a closer look at the under frequency event that occurred at 9.51am on Thursday June 15th 2017, in the North Island of New Zealand. This is quite a long post with quite a bit of technical detail. The … Continue reading

Posted in Electricity, Power System Stability | 5 Comments

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

Posted in Electricity, Power System Stability | 17 Comments

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

Posted in Electricity, Power System Stability | 1 Comment

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

Posted in Electricity, Power System Stability | 2 Comments

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

Posted in Electricity, Power System Stability | 1 Comment

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

Posted in Electricity, Power System Stability | 5 Comments

Electric Power System Stability

I intend to do a few essays about electric power system stability.  I aim to share some concepts about power generation and grids, and in particular how electrical stability is achieved. Some types of generation provide grid stability, other types … Continue reading

Posted in Electricity, Power System Stability | 5 Comments

Professor John Christy on climate change

It’s great that some mainstream media are beginning to look at and talk about what is really happening with climate change. Here’s another interview that’s worth a listen. The person being interviewed is Prof. John Christy.  He is one of THE genuine experts on this topic.  John works at the … Continue reading

Posted in Climate Science, Economics, Electricity, Energy, Environment | Leave a comment