Harmonics caused by imbalanced transformer impedances and imperfect twelve-pulse operation in HVDC conversion
- 1 September 1976
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Apparatus and Systems
- Vol. 95 (5) , 1732-1737
- https://doi.org/10.1109/t-pas.1976.32272
Abstract
In substituting a degree of imbalance between the phase impedances of HVdc converter transformers for the usual assumption of equal impedances, the generated ac harmonics are modified and triplen (non-characteristic) harmonics are produced. They are analysed and assessed; and are not expected to be serious provided due attention is paid to impedance balancing. Certain normal harmonics for 6-pulse operation are ideally eliminated by 12-pulse operation. An analysis is made of the extent of residual 6-pulse harmonics due to the imperfect balance of 12-pulse bridge operation. The paper provides a basis for specifying certain design tolerances.Keywords
This publication has 5 references indexed in Scilit:
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