Performance Parameters of Inverters

Harmonic factor of nth harmonic, HFn
It is a measure of individual harmonic contribution. HFn versus the control parameter gives the harmonic profile of the inverter. Small HFn value is desired.
H{F_n} = \frac{{{V_{on}}}}{{{V_{o1}}}}for{\rm{ }}n > 1
Total harmonic distortion, THD
It is a measure of closeness in shape between a waveform and its fundamental component (sinusoidal waveform). THD = 0 means sinusoidal wave.
THD = \frac{1}{{{V_{o1}}}}\sqrt {\sum\limits_{n = 2,3,...}^\infty {V_{on}^2} }
Distortion Factor, DF
DF indicates the amount of HD that remains in a particular waveform after the harmonics of that waveform have been subjected to the second order attenuation (i.e. divided by n2)
DF = \frac{1}{{{V_{o1}}}}\sqrt {{{\sum\limits_{n = 2,3,...}^\infty {\left( {\frac{{{V_{on}}}}{{{n^2}}}} \right)} }^2}}
DF of nth harmonic component, DFn
D{F_n} = \frac{{{V_{on}}}}{{{V_{o1}}{n^2}}}for{\rm{ }}n > 1
Lowest-order harmonic LOH
LOH is that harmonic component whose frequency is closest to the fundamental one. Its amplitude is normally > 3% of the fundamental component. High LOH is desired.
LOH \ge 3\% \times {V_{o1}}
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1 comment:

  1. kishoreJuly 17, 2017 at 12:48 PM

    You done a great job Admin. You shared a valuable information about Harmonic Calculations. Harmonic distortions are one of the most common and irritating problems in industrial environment. We need to identify the source of harmonics and suppress them for a quality supply of power. We need to measure these harmonics at various points in the system and perform proper scientific analysis as per international standards. To know more please visit , Harmonic Analysis

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