Consider the following statements regarding the HVDC transmission system:
1. The modern HVDC systems use 12-pulse converters.
2. In the HVDC system generation is ac and distribution is dc.
3. No compensation is required in HVDC.
4. In the HVDC system current harmonics on the dc side and voltage harmonics on the ac side of converters are predominant.
Which of the following statement are correct?
1
1, 2 and 3 only
2
2, 3 and 4 only
3
1 and 3 only
4
1, 3 and 4 only