1 / 10

Power Semiconductor Systems II

Power Semiconductor Systems II. Author: Ales Havel E-mail: ales.havel@vsb.cz Phone number: 4287 Headquarters: E227 Web page: http://homen.vsb.cz/~ hav278 /. Content of the presentation. Main types of frequency converters AC-DC converters DC-DC converters DC-AC converters

aysel
Download Presentation

Power Semiconductor Systems II

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Power Semiconductor Systems II Author: Ales Havel E-mail:ales.havel@vsb.cz Phone number: 4287 Headquarters: E227 Web page: http://homen.vsb.cz/~hav278/

  2. Content of the presentation • Main types of frequency converters • AC-DC converters • DC-DC converters • DC-AC converters • AC-AC converters • Direct frequency converters • Cycloconverters • Indirect frequency converters • Converters with voltage type of the DC link • Converters with current type of the DC link

  3. Power converters • A power semiconductor converter is an electrical device for converting electrical energy.

  4. Cycloconverters • Characteristics: • Creation of output AC voltage without the need of DC link • Output frequency is always lower than the input frequency • Large number of thyristors (36 for 3 phase cycloconverter) • but relatively low switching power losses • Relatively complex control due to large number of switches • Non-sinusoidal consumption of mains current, therefore large • consumption of reactive power and wide spectra of harmonics Wiring diagram of one phase of total three-phase cycloconverter

  5. Cycloconverters Principal block wiring topologies of three-phase cycloconverters Without common node With common node

  6. Cycloconverters • Utilization of cycloconverters: • Low speed three-phase synchronous motors with field windings • High power low speed drives with relatively low demands on dynamics Principal of creation of output voltage and current

  7. Cycloconverters – load waveforms Output frequency: 25Hz Load parameters: R = 7Ω, L = 10mH Control parameters: alpha = 0°

  8. Cycloconverters – load waveforms Output frequency: 25Hz Load parameters: R = 7Ω, L = 10mH Control parameters: alpha = 30°

  9. Cycloconverters – load waveforms Output frequency: 25Hz Load parameters: R = 7Ω, L = 50mH Control parameters: alpha = 0°

  10. Thank You for your attention

More Related