Method and device for balancing the circuits of a three-phase sy

Details Method and device for balancing the circuits of a three-phase sy Method and device for balancing the circuits of a three-phase sy

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

051483610

ABSTRACT:
A method and a device balance a three-phase system (18) that is produced by means of an invertor (12) from a d.c. voltage source (10), such that the output (R',S',T') of this invertor (12) is equipped with a filter (14) to which a neutral grounding transformer (16) has been added. In keeping with the invention, absolute values (u.sub.R.sup.*, u.sub.S.sup.*, u.sub.T.sup.*), each of which is fed into a regulator device (34, 42; 36, 44; 38, 46) are formed from measured phase-to-phase voltages (u.sub.RL, u.sub.SL, u.sub.TL). Each absolute value produces a phase-to-phase voltage manipulated variable (U.sub.StR, U.sub.StS, U.sub.StT) such that by means of a transformer device (54), these phase-to-phase voltage manipulated variables (U.sub.StR, U.sub.StS, U.sub.StT) are transformed into phase-to-neutral manipulated variables (U.sub.Str, U.sub.Sts, U.sub.Stt) and are fed into angularly symmetrical control units (96, 98, 100). In this way, using a simple mono-phase control of absolute values, a three-phase system (18) with an asymmetrical load can remain symmetrical and, while retaining the symmetry of angle, the absolute values of the invertor (12) are controlled in an asymmetrical fashion.

REFERENCES:
patent: 4719557 (1988-01-01), Forstbauer et al.
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patent: 4977492 (1990-12-01), Kirchberg et al.
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patent: 5055992 (1991-10-01), Cook
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Siemens Forschungs- und Entwicklungs-Berichte, vol. 6, No. 1, Oct. 1977, pp. 29-38, Berlin, DE; W. Meusel et al.: Coordinate Transformations of Multi-Term Regulation Systems for the Compensation and Symmetrization of Three-Phase Supplies.

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