Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1990-09-21
1992-02-25
Beha, Jr., William H.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
307 45, 307 87, 363 79, H02J 326, H02M 1084, H02M 5458
Patent
active
050918397
ABSTRACT:
To maintain a defined three-phase voltage system at the output terminals of a transformer device TE, for example, a transformer in a delta/wye connection where the primary-side neutral point is unconnected, even when an asymmetrical load is connected to it and to the secondary-side neutral point, single-phase transformers are used, whose primary windings are supplied with voltage by a pulse-width modulated, three-phase invertor in a bridge connection. Through the use of voltage regulators, the actual values of the secondary-side line voltages form the control voltages for each bridge-arm pair. The closed-loop control circuits of the three phase voltages are broken down in accordance with the structure of the transformer device by means of a break-down element. The setpoint values can be calibrated to a synchronizing voltage, and/or a current control for the conductor currents is superposed on the voltage regulators.
REFERENCES:
patent: 4063143 (1977-12-01), Forstbauer
patent: 4367522 (1983-01-01), Forstbauer et al.
patent: 4719557 (1988-01-01), Forstbauer et al.
Gaul Hartmut
Mueller Albert
Beha Jr. William H.
Siemens Aktiengesellschaft
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