Method and device for balancing a three-phase system

Details Method and device for balancing a three-phase system Method and device for balancing a three-phase system

1991-08-08

1992-09-15

Stephan, Steven L.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 37, 363 96, 363 98, H02M 748

Patent

active

051483629

ABSTRACT:
A method and a device balance a three-phase system (18) formed by means of an invertor (12) from a dc voltage source (10), the output (R', S', T') of said invertor (12) being provided with a filter (14) followed by a neutral grounding transformer (16). Positive and negative phase-sequence system components (u.sub.1s, u .sub.1c, u.sub.2c, u.sub.2s) are formed from the measured voltages (u.sub.R, u.sub.S, u.sub.T). These measured voltages (u.sub.R, u.sub.S, u.sub.T) form positive and negative phase-sequence system manipulated variables (U.sub.St.phi., U.sub.St1c, U.sub.St2c, U.sub.St2s). The positive and negative phase-sequence system manipulated variables (U.sub.St1c, U.sub.St2s, U.sub.St2c) are transformed by means of a transformation device (50) into phase-to-neutral voltage manipulated variable (U.sub.Str, U.sub.Sts, U.sub.Stt) and routed to angularly symmetrical drive units 76, 78, 80). A three-phase system (18) formed can thus be kept balanced, with means of the multivariable control systems, even with an unbalanced load.

REFERENCES:
patent: 4922400 (1990-05-01), Cook
patent: 4977492 (1990-12-01), Kirchberg et al.
patent: 4994956 (1991-02-01), Kirchberg et al.
patent: 5008801 (1991-04-01), Gleanon
patent: 5055992 (1991-10-01), Cook
patent: 5057989 (1991-10-01), Hirose et al.

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