FREQUENCY-CONTROLLED ELECTRIC DRIVE WITH SUPERCAPACITORS OPERATION DURING POWER SUPPLY INTERRUPTIONS
This paper is dedicated to the investigation of frequency-controlled electric drive’ sensitivity to mains voltage interruptions. To prevent drive shutdown due to short-time mains voltage disruptions it is proposed to connect a supercapacitor bank directly to the frequency converter’ s DC link. Frequency-controlled electric drive mathematical model that allows investigation of mains voltage interruption is considered, as well as a formula for supercapacitor bank capacity calculation using required uninterruptible work time. In conclusion there is a comparison given for simulation results, experimental results, and formula calculation results.