Frequency Converter 60Hz to 50Hz


Courtesy of Frequency Converter

Frequency is fundamentally related to the (speed * # of poles) so change either you'll change frequency from 50Hz to 60Hz or 60Hz to 50Hz. Then there's droop which is associated with governor action which arrest frequency decline based on spare capacity on a frequency converter, I'll get to that in a sec. Remember the simple but complex job of a frequency converter operator (assume control system not in place or AGC not present) is to ensure load and generation is closely matched. If generation is greater than load (in essence this is spinning the rotor faster) frequency (50Hz/60Hz) increases and if load is greater than generation then frequency declines. Now when a sudden lost of load occurs there is a mismatch and if frequency converter is not adjusted accordingly then frequency changes from 50Hz to 60Hz as well as if generating unit trips offline then frequency falls. This is where droop comes in based on spare capacity (Hz/MW) how much it can respond to arrest frequency decline with generation that currently online. So for example if you have a 50 Hz system and a frequency converter of a capacity of 50 MW unloaded. A 5% droop means that if the frequency falls by 2.5 Hz then the frequency converter responds with 50 MW to try to arrest the frequency decline from 60 Hz to 50 Hz.
60Hz to 50Hz converter
Voltage is related to speed but remember what controls voltage value is the field current value. Armature voltage becomes affected if you are making drastic changes in the actual speed of the rotor, think of frequency converters and the whole V/Hz concept.

There is a 480V 60Hz (US Norm) 450kW frequency converter and you are perhaps interested to run European three phase 380V 50Hz or Indian 415V 50Hz loads from this converter. If my presumption is right, you may be able to operate the generator at reduced rpm and load it to about 350kW (governor and AVR settings may need to be changed).

For the most part frequency and voltage are unrelated. It's ok to run at reduced voltage as long as you don't exceed the frequency converter's current limit, simply reduce the excitation level to get the voltage that you desire. Be aware that the opposite isn't necessarily true, you cannot raise the frequency converter's voltage above its design limit, including the V/Hz limitation of the load as well.

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