Starting a three-phase multiport Active Bridge DC-DC converter

摘要

The invention relates to a method for starting and operating an n-port three-phase active bridge converter (10), where n is a number of any ports (1, ..., n) and n ≥ 2, each one Port (1, ..., n) is operable as an input or output port, wherein each of the ports (1, ..., n) has a first, second and third phase branch (16), each of the first, second and third phase leg of the other n-1 ports, and wherein each phase leg has an upper active switch (17) and a lower active switch (19), with a phase shift (20) between the phase legs (16) of each port, the ports capable of converting a DC voltage (U) into an AC voltage (v) and vice versa, the ports (1, ..., n) being connected via a three phase transformer (25) or via three separate single phase transformers (25) are each connected to each of the respective phase branches (16) of each of the n ports (1, ..., n) n are to transmit power between the ports (1, ..., n), wherein the switches (17, 19) of the phase branches (16) are operated by a control unit (30) according to the method (200), at least to reduce an initial DC offset (32) in a magnetizing current I _M at least in the starting phase, and a system having an n-port three-phase active bridge converter suitable for performing the method.