Power supply device for a nonlinear, time-varying load

摘要

A power supply device for a nonlinear, time-varying load has a multi-phase power system. The load and a reactive power compensator are connected to the phases of the power system. The reactive power compensator is embodied as a multilevel converter with multiple strands, each connected to one of the power system phases and to the other strands at a common star point. The power supply device has a filter circuit that filters harmonics of load and converter currents. The filter circuit has multiple strands, each connected to one of the power system phases and to the other strands at a common star point of the filter circuit, which is connected to the common star point of the multilevel converter such that the common star point of the multilevel converter is connected to the power system phases both via the strands of the multilevel converter and via the filter circuit.

主权项

1. A power supply device for a nonlinear, time-varying load, comprising:
a power system having a plurality of phases, wherein the nonlinear, time-varying load and a reactive power compensator are connected to the phases of the power system, wherein the reactive power compensator is embodied as a multilevel converter having a plurality of strands, wherein each strand of the multilevel converter is connected to one of the phases of the power system and to the other strands at a common star point, a filter circuit configured to filter harmonics of load and converter currents, wherein the filter circuit has a plurality of strands, each strand being connected to one of the phases of the power system and to the other strands at a common star point of the filter circuit, wherein the common star point of the multilevel converter is connected to the common star point of the filter circuit such that the common star point of the multilevel converter is connected to the phases of the power system both via the strands of the multilevel converter and via the filter circuit, and wherein the connection via the filter circuit provides a low-resistance connection of the common star point of the multilevel converter to the phases of the power system with respect to the power zero sequence system of the power system and a high-resistance connection with respect to the power positive sequence system of the power system and to the power negative sequence system of the power system.