Issues regarding harmonic suppression in frequency converters
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I would like to ask about various low-voltage frequency converters used in chemical plants: apart from adding reactors at the output side, what other effective methods are there for suppressing harmonics? Thank you. Additionally, there are several motors in the factory that use frequency converters to increase their rotational speed to 4000 revolutions per minute; does such operating condition cause significant damage to the frequency converters? Are there any methods to prevent failures and estimate lifespan? Thank you.
I’m a beginner; I’m not sure whether active filters are useful or not
The principle of an inverter is to use numerous rectangular waves arranged to form sine wave curves at different frequencies in order to drive the motor. Rectangular waves all contain spike pulses, and high-end inverters handle this issue relatively better. The common approach is to improve the anti-interference performance of other instrumentation devices. The core component of the inverter can be adjusted to the highest set frequency; however, for different motors, it is necessary to consider their intended use, particularly whether the transmission components such as bearings can handle high-speed operation.
Thank you for your reply. A few days ago, a frequency converter that had been in use for 7–8 years suffered damage to its rectifier board and silicon stacks after frequency adjustment. It is suspected that the prolonged operation under high load led to breakdowns due to fluctuations after frequency adjustment; I was wondering if this could be the cause.
Are there any reliable brand recommendations and practical examples? Thank you
Firstly, harmonics control can also be achieved using active filters； Secondly, increasing the speed causes greater damage to the motor; determine whether your motor is an inverter-driven motor and by how many times the speed is increased.
The problem is that the rectifier circuit burning out seems to have nothing to do with high frequency, right?
Received. May I ask if you have any recommended brands and models for active filters? Thank you