12-pulse Operation of Converter
If two full converter are connected in either series or parallel combination, it gives twelve pulse output, thus the name "12-pulse operation of converter". Few precaution must be taken for the connection of it which is described in the detailed description of this topic.
Summary
If two full converter are connected in either series or parallel combination, it gives twelve pulse output, thus the name "12-pulse operation of converter". Few precaution must be taken for the connection of it which is described in the detailed description of this topic.
Things to Remember
1) A three phase bridge rectifier gives a six pulse output voltage. When two three phase bridge rectifier are connected either in series or parallel combination, it gives 12 pulses output voltage.
2) 12 pulse output voltage which is better than that of three-phase bridge rectifier in terms of rectifier efficiency and has also lower harmonics content present in it (i.e low ripple content).
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12-pulse Operation of Converter
12-pulse Operation of Converter
A three phase bridge rectifier gives a six pulse output voltage. When two three phase bridge rectifier are connected either in series or parallel combination, it gives 12 pulses output voltage which is better than that of three-phase bridge rectifier in terms of rectifier efficiency and has also lower harmonics content present in it (i.e low ripple content). And the most important point to be cared about when two three phase bridge rectifier are connected in series is that the input supply voltage supplied to first and second three phase bridge rectifier must have phase displacement of 30 degrees and this can be introduced by the use of the star-star transformer and Star-Delta transformer
When two three phase bridge rectifier are connected in a parallel combination,it is necessary to insert an interphase reactance between the bridges in order to adjust the instantaneous voltage difference between two bridges.Both the use of star-delta transformer and use of interphase reactance can be viewed on the diagram below.
References
1) M.H.Rashid. Twelve-Pulse Converter. Delhi: Pearson, 2013.
Lesson
HVDC Power Transmission
Subject
Electrical Engineering
Grade
Engineering
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