Abstract
This article discusses the problem of sufficient inductance of AC line reactor at the input of frequency converter. Author provided some simulations for frequency converter loaded by induction motors with different rated powers. For all induction motors the following characteristics of phase current consumed by frequency converter from the grid considered. Instantaneous peak current during the frequency acceleration of induction motor. Amplitude of the current in steady state mode after the end of induction motor acceleration. Instantaneous peak current during additional charge of DC-link capacitance through the shunting contact of charging resistance. Instantaneous peak current when charging DC-link capacitance through the charging resistance - the most stable characteristic, which is practically does not depend on the presence and nominal of the line reactor. It is advisable to demand to inductance of the line reactor, that is, to percent impedance or short-circuit voltage, %, that the considered in computational experiments peak and amplitude values of currents remain not higher than the last above mentioned. It can be stated that with the increase of induction motor rated power, the sufficient value of short-circuit voltage, %, also increases.
Highlights
Frequency Converter (FC) for feeding three-phase induction motors (IM) today is a mass-used device in automation systems of various technological processes
It is advisable to demand to inductance of the line reactor, that is, to vsc, %, that the considered in computational experiments peak and amplitude values of currents remain not higher than the last above mentioned
The most stable characteristic of current consumed by FC from the grid is the instantaneous peak current when charging through the charging resistance
Summary
Frequency Converter (FC) for feeding three-phase induction motors (IM) today is a mass-used device in automation systems of various technological processes. During FC turn-on to voltage the initial charge process of capacitance Cd starts through charging resistance R, which will be shunted by switch K after some time. Manufacturers recommend when powered the FC group from the single power supply to equip every FC by individual line reactor, matching continuous current, and not use the single line reactor for an entire group of FC [7]. In 2018 the dependence of price P, rubles, of line reactor rated to current I, A (current consumed by one phase of FC) can be described by the expression P = 237.58 ⋅ I + 1301.9. 1.5 times more expensive than a single reactor rated for 50 A
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