What are good solutions for medium-voltage frequency converters to handle voltage fluctuations?
Thread Content
The unit is equipped with several sets of medium-voltage frequency converters coupled with fans; this is particularly important, as there is a concern that power fluctuations could cause the system to stop operating. I would like to make modifications to improve stability. The inverter comes with a voltage drop protection feature with a delay of 2 seconds; it is said that a maximum voltage drop of 50% is allowable. But I don’t think this is reliable How about adding a DC power supply?
Generally, decent frequency converters have a power-loss bypass function that uses the rotational inertia of the load to charge in reverse and maintain the DC bus, thereby ensuring continuous output from the frequency converter; a time duration of a few hundred milliseconds is usually sufficient. As for several seconds, it depends on the specific operating conditions. There are hardly any cases where a power supply is connected directly to the DC bus; the cost and complexity make this approach unsuitable
Adding an anti-transient voltage module to the control circuit will suffice; transient voltages within 1S will not cause the unit to shut down.
I don’t know what the power capacity is; an emergency power supply can be added, which generally ensures continuous power supply