Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1996-05-15
1997-05-27
Wong, Peter S.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 96, H02M 112
Patent
active
056337884
ABSTRACT:
A control system for a pulse-width modulation controlled power converter composed of self-turn-off devices. The control system includes a voltage command value generator for the power converter, a carrier wave generator and a circuit for correcting at least one of the voltage command value and the frequency of the carrier wave to generate as a corrected voltage command value and a corrected carrier wave. The control system further includes a gate pulse signal generator for receiving a first signal and a second signal and for comparing the first and second signals to generate gate pulse signals to the self-turn-off devices for controlling the power converter based on a comparison result. The voltage command value is taken as e (-1.ltoreq.e.ltoreq.+1), and a level setting value is taken as E.sub.a (0<E.sub.a <1). The gate pulse signal generator receives the voltage command value and the carrier wave as the first and second signals when -E.sub.a .ltoreq.e.ltoreq.+E.sub.a. The gate pulse signal generator receives one of the voltage command value and the corrected voltage command value as the first signal and one of the carrier wave and she corrected carrier wave as the second signal when e<-E.sub.a or +E.sub.a <e.
REFERENCES:
patent: 5285365 (1994-02-01), Yamato et al.
patent: 5341286 (1994-08-01), Inoue et al.
1991 IEEE Industry Applications Society Annual Meeting vol. 1, Papers Presented at the 1991 Industry Applications Conference 26th IAS Annual Meeting, Sep.28-Oct. 4, 1991 pp. 847-853.
Miura Kazutoshi
Tanaka Shigeru
Han Y. J.
Kabushiki Kaisha Toshiba
Wong Peter S.
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