Open AccessApplication of common-mode-free control topology to a two-level inverter
Author(s) -
Konstantin Vostrov,
V Frolov
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/643/1/012118
Subject(s) - waveform , converters , inverter , induction motor , sine wave , computer science , bearing (navigation) , asynchronous communication , galvanic isolation , control theory (sociology) , common mode signal , electronic engineering , topology (electrical circuits) , voltage , electrical engineering , engineering , control (management) , digital signal processing , telecommunications , artificial intelligence , analog signal , transformer
The use of asynchronous motors in electric drive systems has become widespread and convenient. Also, since the frequency converters became wide-spread and popular devices, induction motors became the most popular machine type in both constant- and variable-speed applications. However, the conventional two-level frequency converter’s output three-phase waveform is not fully repeating ideal sine waves provided from the grid. The so-called common-mode voltage appears because of specifics of the converter operation and works as the source of harmful parasitic phenomena of bearing currents. Flowing through the motor bearings, these currents providing a list of undesirable effects, finally causing the bearing properties degradation and early system failure. Current paper deals with the novel control method described earlier and show the method implementation by the means of the two-level frequency converter.