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Yes indeed, I was able to add my comment now. Thank you!

I tried to comment on one of the articles on the site (about PLC languages) but got a message saying "You are not allowed to post comments". Any idea why that happened and if I can do anything about it?

In principle, there seem to be options to set email and other preferences in your 'account'; click the button in the top right corner of the browser window. I just discovered this and it is too early to say if they actually work (i.e. I haven't received any email notifications yet; will report...

Dear faaramin, There is no simple answer to your question. The magnitude of the frequency variation due to a disturbance, e.g. a generator tripping, depends on a number of factors, of which the main ones are: - The magnitude of the loss of generation relative to the total load (or...

To add a note of caution to Bill's recommendations, in many practical cases the derivative action of a PID controller acts only on the signal measurement, not on the error. To make this explicit, it can be written as PI-D, but that is not always done. So if you rely on the 'kick' aspect of...