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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

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Power Semiconductor Systems II

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  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

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