DC link voltage ripple of voltage-source active rectifiers

摘要

The paper deals with the DC link voltage ripple of voltage-source active rectifiers switched by PWM. The DC link voltage is maintained constant by a converter control; it fluctuates around the desired value. Therefore the first part of the paper describes the influence of voltage-source active rectifier parameters on the DC link voltage ripple. The effects of capacitors, loads and switching frequencies on the DC link voltage ripple are investigated. Also the paper discusses the influence of the DC link voltage ripple on current harmonics drawn from the grid by voltage source active rectifiers. The harmonics in the input current spectrum appear around the switching frequency. The last section analyzes the deviations of the current harmonics caused by the DC link voltage ripple.