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A 3-phase Voltage Source Inverter is operated in 180° conduction mode. Which one of the following statements is true?
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- Both pole-voltage and line-voltage will have 3rd harmonic components
- Pole-voltage will have 3rd harmonic component but line-voltage will be free from 3rd harmonic
- Line-voltage will have 3rd harmonic component but pole-voltage will be free from 3rd harmonic
- Both pole-voltage and line-voltage will be free from 3rd harmonic components
- Both pole-voltage and line-voltage will have 3rd harmonic components
Correct Option: B
Line voltage,
| For n = 3, VL = 0. as cos |  |  | = 0 | |
| 6 |
Pole voltage,
For n = 3, VP ≠ 0.
Hence it is not free from third hormonics.
