A novel approach to minimize line-current harmonics in interfacing power electronics equipment with 3-phase utility systems

摘要

A novel approach is presented to achieve nearly sinusoidal line current rectification of three-phase utility voltages by DC link current modulation. Significant benefits of this approach are: only two transistor switches are required; a regulated DC voltage is provided at the output, thus simplifying the design of the rest of the power electronics equipment; the output DC voltage, which can be quite large, is automatically shared equally by two series-connected capacitors; and the usual disadvantages of passive filters are avoided. This approach can be applied to most of the power electronics equipment with three-phase utility input, as well as to interface generation using renewable energy resources such as wind and solar power.