ABSTRACT
This chapter presents the details of the parallel and interleaved operation of parallel three-phase hardware. It demonstrates that interleaved operation of three-phase systems is a viable solution for medium and high power converters, especially in applications with low voltage and high current. The idea is to use power converter modules from an existing series production and to add especially manufactured hardware that can support parallel connection of these modules, while using revised or additional software. Many versions of vector control implemented by the industry within standard three-phase power converters have considered only the control, without any controller for the zero sequence. An alternative solution is to select the same zero state in all power converters whenever a zero state is necessary. Circulation currents between power converters can appear if the switching pattern in one or more converter legs is different from one power stage to another.
