The reactor in the circuit generally has two functions: | ||||||
(1) Suppress surge (voltage and current); (2) Suppress harmonic current. | ||||||
Reactors are divided into input reactors, output reactors and DC reactors in the use of frequency converters. | ||||||
Different reactors have different functions on the frequency converter. | ||||||
input reactor | ||||||
It is used to limit the current impact caused by the sudden change of power grid voltage and switching overvoltage, | ||||||
smooth the peak pulse contained in the power supply voltage, | ||||||
or smooth the voltage defects generated during the commutation of bridge rectifier circuit, | ||||||
effectively protect the frequency converter and improve the power factor. | ||||||
It can not only prevent the interference from the power grid, | ||||||
but also reduce the pollution of harmonic current generated by the rectifier unit to the power grid. | ||||||
output choke | ||||||
The main function is to compensate the influence of the distributed capacitance of the long line (20-200m), | ||||||
reduce the motor ground leakage current, suppress the output harmonic current, | ||||||
improve the output high-frequency impedance, and effectively suppress dv/dt. | ||||||
Reduce the high-frequency leakage current, protect the frequency converter and reduce the equipment noise. | ||||||
DC reactor | ||||||
t is connected between the DC rectification link and inverter link of the frequency conversion system. | ||||||
Its main purpose is to limit the AC component superimposed on the DC current to a specified value, | ||||||
keep the rectifier current continuous, reduce the current pulse value, | ||||||
make the inverter link operate more stably and improve the power factor of the frequency converter. | ||||||
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