Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1997-02-07
1998-07-14
Berhane, Adolf
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 95, 363131, H02M 112
Patent
active
057814236
ABSTRACT:
In a pulse width modulation control method and system for an electric power converter, in order to suppress the occurrence of lower order harmonics and fractional order harmonics in a direct current component even in a condition where a carrier frequency is several times as small as the frequency of a command value, pulse width modulation pulses for driving semiconductor elements in the electric converter are calculated by comparing a command signal from a command value generating means with a carrier signal having a continuous triangular-wave and a constant period. For this purpose, there is provided a means for separately calculating a time product of a command value of the command signal from the command value generating means and a time product of the pulse width modulation pulses and for calculating a difference value representing a difference between both time products. The pulse width modulation pulse is then calculated using the calculated difference value to compensate the command signal received from the command value generating means.
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Inarida Satoru
Miyake Wataru
Nakata Kiyoshi
Suzuki Masato
Yasuda Kouji
Berhane Adolf
Hitachi , Ltd.
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