Power factor corrector for bipolar unbalanced load and asymmetrical three-phase power supply

摘要

This paper describes the issue of controlling three-phase power factor corrector (PFC) for unbalanced bipolar load and input asymmetrical three-phase voltage. The method of direct power control was chosen. By means of the suggested mathematical description, the compromise to provide satisfactory harmonic composition and to stabilize output voltage, when the difference of average bipolar voltages of output capacitors is min, was found. The prototype was presented. It has 400 V, 50 Hz input voltage and 50 kVA power. The paper is of great interest for those developers of three-phase PFCs who challenging to develop units with high efficiency factor and reliable control system.