초록 ▼

An active interphase reactor for twelve-pulse diode rectifiers is disclosed. The system draws near sinusoidal currents from a power utility. In one embodiment, a low kVA (0.02 P.sub.o (PU)) active current source injects a triangular current into an interphase reactor of a twelve-pulse diode rectifie

An active interphase reactor for twelve-pulse diode rectifiers is disclosed. The system draws near sinusoidal currents from a power utility. In one embodiment, a low kVA (0.02 P.sub.o (PU)) active current source injects a triangular current into an interphase reactor of a twelve-pulse diode rectifier. This modification results in near sinusoidal utility input currents with less than 1% THD. In alternative embodiments, a low kVA, 12-pulse system with an autotransformer arrangement (kVA rating of 0.18 P.sub.o (PU)) is implemented with the proposed active interface reactor. The resulting systems draw clean power from the utility and are suitable for powering larger kVA ac motor drive systems.

대표청구항 ▼

[ What is claimed is:] [1.] A utility interface for drawing current from a three-phase electric utility, comprising:a primary transformer, coupled to said three-phase electric utility, for generating first and second three-phase input signals;first and second rectifiers, coupled to said transformer

[ What is claimed is:] [1.] A utility interface for drawing current from a three-phase electric utility, comprising:a primary transformer, coupled to said three-phase electric utility, for generating first and second three-phase input signals;first and second rectifiers, coupled to said transformer to receive said first and second three-phase input signals, respectively, for rectifying said first and second three-phase input signals and for producing first and second DC output currents, respectively, between respective positive and negative outputs of said first and second rectifiers;a first zero sequence blocking transformer having first and second windings each having first and second terminals, said first terminal of said first winding being coupled to said positive output of said first rectifier and said first terminal of said second winding being coupled to said negative output of said first rectifier;a second zero sequence blocking transformer having first and second windings each having first and second terminals, said first terminal of said first winding being coupled to said positive output of said second rectifier and said first terminal of said second winding being coupled to said negative output of said second rectifier;said second terminal of said first zero sequence blocking transformer's second winding being coupled to said second terminal of said second zero sequence blocking transformer's second winding;an interphase reactor having a primary winding coupled between said second terminal of said first zero sequence blocking transformer's first winding and said second terminal of said second zero sequence blocking transformer's first winding, said interphase reactor further having a secondary winding;an active current source, coupled across said secondary winding of said interphase reactor, for injecting a compensation current into said primary winding of said interphase reactor.