On 02/05/2013 09:40, The Natural Philosopher wrote:

Tell that to the German factories running synchronous motors that are
having f to intsall massive UPS/inverters because sudden fluctuations in
the mains frequency due to sun coming out/wind gust coming along are
destroying the machines the motors drive.



I have to point out that the solar inverters have a very stringent
frequency range over which they are allowed to operate.

They will drop out if the grid exceeds that range.