Abstract
Frequency converters, used for induction motors regulation, cause higher voltage harmonic in power net. Level of harmonic depends upon inverter and power net parameters; sometimes power net parameters make more influence for electric energy quality than frequency converter parameters. In this research some models of frequency converters were analyzed, comparing simulation results each with other and with real converter voltages and currents measurement results. Analysis of voltage harmonics in power nets with frequency inverters was done in this article, analyzing influence of power net parameters to power quality. Ill. 14, bibl. 7, tabl. 2 (in English; abstracts in English and Lithuanian).DOI: http://dx.doi.org/10.5755/j01.eee.117.1.1055
Highlights
Induction motors are widely used in various industry enterprises
In industry enterprise power network frequency converters usually are connected to 0,4 kV bus
Numerical integration rectifier model and its current from electric supply net It is necessary to say that authors of this article have a deal with modeling of frequency converters input currents for some time [5, 6], but previous models have several disadvantages comparing with model, designed here
Summary
Induction motors are widely used in various industry enterprises. Its construction is simple, motor work reliability is high, costs is not high. Voltage and frequency is changing according to necessary induction motor speed and load In this time frequency converter takes from power net non sinusoidal current, with may cause voltage non sinusoid in power net and to disturb normal job of other customers. Choke is inductance; voltage drop in choke for nominal current is about 3-5 % These solutions typically reduce the THDI (total harmonic distortion of current) to a level less than 48 %. In order to overcome these disadvantages, for example, the ALTIVAR 21 drive integrates new reduced capacitor technology [1] This technology makes it possible to obtain a THDI less than 35 % without having to add a choke, offering the following advantages: optimized technology through the reduction of current harmonics by decreasing the value of filter capacitors [1]. Method advance is greater reduction of current harmonics compared with traditional solutions: line chokes and DC chokes
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