Abstract
Due to the operation of power semiconductor switching converters, the content of harmonic currents, which these switching converters take from the feed array, is still increasing. One of the possible ways of minimizing these currents is the use of pulse switching converters. On one hand, the original, characteristic harmonic ones are minimized, but, on the other hand, new frequencies caused by the modulation frequency appear in the current spectrum. The level of the currents of these frequencies is small and is scarcely dependent on the load of the converter. It may happen that the proportional value of the monitored harmonic one is high, although the absolute value is low. In the article presented, there is a description of the activity of the pulse voltage rectifier and an analysis of the current taken. The other part contains the results of the harmonic analysis of the stated current, including both the absolute and proportional values according to the load. In the conclusion, there are results of measurements of pulsed switching converters taken from the real measurement.
Highlights
Due to the operation of power semiconductor switching converters, the content of harmonic currents, which these switching converters take from the feed array, is still increasing
The other part contains the results of the harmonic analysis of the stated current, including both the absolute and proportional values according to the load
Conventional controlled rectifiers designed for speed regulation of DC motors were characterized by both the consumption of harmonic currents and, especially, the variable power factor
Summary
Conventional controlled rectifiers designed for speed regulation of DC motors were characterized by both the consumption of harmonic currents and, especially, the variable power factor (proportional to the steering angle of the converter). A significant increase of negative effects of the converters on the power network occurs with the increase of frequency converters with a DC voltage intermediate circuit. These converters usually contain uncontrolled rectifiers at the input. It is a rectifier working to capacitive load; the values of harmonic currents are very high. Equation (1) advantage is that it applies to conventional controlled rectifiers, to calculation of the harmonic ones with intermittent currents, to calculation of harmonic voltage converters as well as to frequency converters or other rectifiers working to capacitive loads.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
