High-pulse series converters for HVDC systems

In this work a novel concept has been developed, whereby series-connected c onverters with any desired number of pulses can be obtained without complic ated circuitry. A complete theoretical treatment and experimental verificat ion are carried out in this paper to fully validate the concept. This gener alization is achieved by adding an extra circuitry to a conventional conver ter connection. Besides, pure natural commutation is used and the concept i s equally valid for rectification and inversion. Also, the application of t he concept on HVdc systems, to reduce harmonics that are normally injected into the ac and dc networks, is analyzed. Therefore, the elimination of har monic filters and their inherent complexities in conventional installations may be possible.