3 Phase VSC SPWM (Triple-n harmonics)

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SUMMARY

The discussion centers on the acceptance of triple-n harmonics in the output voltage spectrum of Voltage Source Converters (VSCs) when utilizing Sinusoidal Pulse Width Modulation (SPWM) with a frequency modulation index that is a large odd integer multiple of 3. Participants clarify that in three-phase current systems, triple-n harmonics naturally cancel out, which is a key reason for their acceptance in this context. The acronym definitions for VSC and SPWM are also provided for clarity.

PREREQUISITES
  • Understanding of Voltage Source Converters (VSC)
  • Knowledge of Sinusoidal Pulse Width Modulation (SPWM)
  • Familiarity with harmonic analysis in electrical systems
  • Basic concepts of three-phase electrical systems
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  • Research the principles of harmonic cancellation in three-phase systems
  • Study the effects of frequency modulation index on SPWM performance
  • Explore advanced harmonic analysis techniques for VSC applications
  • Learn about the design considerations for minimizing harmonics in power electronics
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Electrical engineers, power electronics specialists, and anyone involved in the design and analysis of Voltage Source Converters and their harmonic performance.

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Why is it that we accept triple-n harmonics in the output voltage spectrum of VSCs?

Assume we are using SPWM where the frequency modulation index is selected to be a large odd integer multiple of 3.

Thanks again!
 
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Sorry I don't understand the acronyms.

In case this is three-phase current, triple-n harmonics cancel out naturally.
 
Enthalpy said:
Sorry I don't understand the acronyms.

In case this is three-phase current, triple-n harmonics cancel out naturally.

Sorry about the acronyms, I thought they were commonly used.

VSC = Voltage Source Converter

SPWM = Sinusoidal Pulse Width Modulation

Can you explain further how the triple-n harmonics cancel out naturally? And by "triple-n" do they just mean the harmonics that are integer multiple of 3?
 

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