System voltage regulation and VFD
System voltage regulation and VFD
(OP)
The system we are designing has 80% VFD loads. We are trying to figure out the ideal way of controlling system voltage. We are planning to change the taps on the supply tranformer to boost the system voltgae at full load conditons. However, if all VFDs are not running, the rest of the loads should be designed to withstand overvoltgae it might cause. The size of supply transformer is 10MVA. We prefer not to use on load tap changer since it tends to react too sensitively to voltage fluctuations. Any suggestions?





RE: System voltage regulation and VFD
Keith Cress
kcress - http://www.flaminsystems.com
RE: System voltage regulation and VFD
RE: System voltage regulation and VFD
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If we learn from our mistakes I'm getting a great education!
RE: System voltage regulation and VFD
The drives and the motors should be supplied for yr worst condition. This may mean for example, that the motor nominal voltage is lower than the corresponding drive nominal input voltage such that when the input volts are low the output volts at nominal motor speed are still available to achieve the nominal torque. This should already be a consideration due to the voltage drops one gets across input and output reactors and motor cables.
Your other loads should be able to cope with the voltage drop due to the transformer impedance at full load.
RE: System voltage regulation and VFD
Bill
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"Why not the best?"
Jimmy Carter
RE: System voltage regulation and VFD