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With todays power supply systems switching and harmonic transients are taken care of very easily. Capacitive and inductive transients and associated harmonics are regulated in an almost instantanious manner by high speed inductive and capacitive switched regulators spread accross the country and controlled by high speed high volume SCR's, other solid state devices and high speed mechanical switches such as Joslyne switches and by rotating synchronous condensors which add to the stability of the power system by adding further to the rotating mass adding a softening effect to any such load changes.
With the requirement of the system to hold rotating mass in reserve at all times allows for short term overload to be carried without the system shutting down. In this situation frequency may fall slightly until the reserve mass can be deployed but even in this situation reductions in frequency below the rated 50 cycles is regulated heavily to maintain frequency stability above 49.7 hz.
Not to many portables can maintain a 25% overload and maintain stability for 5 minutes or more.
We are very fortunate in Australia to have the electricity system we have which can handle a system disturbance which would shut down many such systems around the world.
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