3 Phase VSC SPWM (Triple-n harmonics)

AI Thread Summary
Triple-n harmonics are accepted in the output voltage spectrum of Voltage Source Converters (VSCs) using Sinusoidal Pulse Width Modulation (SPWM) because they naturally cancel out in three-phase systems. This cancellation occurs due to the symmetrical nature of the three-phase current, where harmonics that are integer multiples of three do not contribute to the line-to-line voltage. The discussion clarifies that "triple-n" refers to harmonics that are multiples of three. Understanding these concepts is crucial for optimizing VSC performance in applications. The cancellation of these harmonics helps improve overall system efficiency and reduces distortion.
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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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