Active neutral current compensator

Details Active neutral current compensator Active neutral current compensator

1994-07-08

1996-11-12

Wong, Peter

Electricity: power supply or regulation systems

For reactive power control

Using converter

323211, 363 40, G05F 170

Patent

active

055743560

ABSTRACT:
An active power conditioner for mitigating zero-sequence currents in electrical distribution by items wherein a multi-phase, neutral-forming structure employs a controllable voltage source, which source is controlled by a current-responsive voltage controller, to cancel an equivalent impedance of the multi-phase, neutral-forming structure so that zero-sequence currents are shunted to ground, thereby effectively nullifying the zero-sequence current respective to the source. The multi-phase neutral-forming structure may include multi-phase, neutral-forming autotransformers, zig-zag autotransformers, grounded-wye/unloaded-delta transformers and the like. While zero-sequence fundamental harmonic currents may be selectively shunted to ground, positive- and negative-sequence currents may remain essentially unaffected. The compensating action employed herein may be purely reactive in nature and thus consume little real power.

REFERENCES:
patent: 4967334 (1990-10-01), Cook et al.
patent: 5343079 (1994-08-01), Mohan et al.
patent: 5416688 (1995-05-01), Levin

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