Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1988-09-23
1989-09-26
Beha, Jr., William H.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 72, H02M 744
Patent
active
048705578
ABSTRACT:
A quasi-harmonic neutralized static power converter comprises one or more threephase phase shifting transformers having open primary windings fed at opposite ends by poles in separate ones of an associated pair of six-pulse bridge inverter circuits. The secondary winding of at least one of the phase shifting transformers is a delta winding or a wye winding connected to a neutral line. In order to block zero sequence currents which would be induced in such secondaries, a zero sequence blocking transformer is inserted in either the primary of secondary of any one of the phase shifting transformers. Preferably, the zero sequence blocking transformer has three identical zero sequence blocking windings wound on a common core. Each of the zero sequence windings is connected in series with a separate one of the windings in the selected transformer primary or secondary. In the case of a wye secondary connected to a neutral line, a single zero sequence winding in the neutral line can block the zero sequence current in all three phases.
REFERENCES:
patent: 3671846 (1972-06-01), Corey
patent: 3876923 (1975-04-01), Humphrey et al.
patent: 3903469 (1975-09-01), Ravas
B. D. Bedford et al., Principles of Inverter Circuits, copyright 1964, by John Wiley & Sons, Inc., pp. 252, 267, 269, 308, 309.
Gordon S. Stobbelaar et al., "10MVA Powering Conditioning System for Lean Acid Battery Energy Storage System,"]copyright 1987, by General Electrical Company, USA, pp. 1222-1234.
Bendix VSCF Technology, Allied Signal Technologies, pp. 1-12.
Beha Jr. William H.
Studebaker B. R.
Westinghouse Electric Corp.
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