Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1990-03-08
1992-10-13
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 41, H02M 545
Patent
active
051556715
ABSTRACT:
A power converter comprising a current-type inverter is disclosed, in which an output of a converter unit is applied as an input to the inverter unit through a DC reactor, and AC power is supplied to a load from the inverter unit. A ripple component of the DC input of the inverter unit is detected, and the switching elements of the inverter unit are controlled by modulation rate if they are to be subjected to PWM control, thus completing a sinusoidal waveform of the output of the inverter unit. Specifically, since the input to the inverter unit is allowed to contain a ripple, the DC reactor is reduced in size. The output of the inverter unit is a sinusoidal AC power containing no high harmonics and therefore the load is free of effects of high harmonics.
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Inaba et al., "One-chip Microprocessor-based PWM Control Method on Current Source Inverter System", IEEE National Conference, 1987.
Ando Takeki
Fukuda Satoshi
Hokari Sadao
Inaba Hiromi
Nakamura Kiyoshi
Beha Jr. William H.
Hitachi , Ltd.
Hitachi Elevator Engineering and Service Co., Ltd.
Hitachi Engineering Co. Ltd.
Peckman Kristine L.
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