Control apparatus for power converter
AssigneeHitachi, Ltd.
InventorsSeiji Ishida, Toshiaki Okuyama, Takashi Ogawa, Tetsuo Kojima, Kiyoshi Nakata
Life of this patent
Estimating the term…
Abstract
Filter capacitor voltage “Ecf1” is detected and then after d-axis voltage correction value “dvd”, q-axis voltage correction value “dvq”, q-axis current correction value “diq”, and frequency correction value “dω1” have been computed from the AC components of “Ecf1” and the results have been added to the corresponding d-axis voltage command, q-axis voltage command, q-axis current, and frequency command, the DC current of the power converter is controlled. Thus, the AC components included in the DC current are offset and the AC components are suppressed effectively.
Claims20
A power converter control apparatus for sending an alternating-current voltage command, subject to a voltage command and a frequency command, to a power converter for converting a direct-current voltage into a variable alternating-current voltage of a variable frequency, said power converter control apparatus comprising:
- a detector for detecting an amount of electricity generated at the direct-current side of the power converter,
- a high-pass filter for removing direct-current components from the detected amount of electricity,
- a voltage corrector for correcting said voltage command in accordance with an output signal from said high-pass filter, and
- a frequency corrector for correcting said frequency command in accordance with said output signal from said high-pass filter,
- wherein an alternating-current voltage command is issued in accordance with output signals from said frequency corrector and said voltage corrector.
A power converter control apparatus having
- a voltage control unit for issuance of a first d-axis voltage command and a first q-axis voltage command, and
- a frequency control unit for output of a first frequency command,
- and capable of sending an alternating-current voltage command, subject to a voltage command and a frequency command, to a power converter for converting a direct-current voltage into a variable alternating-current voltage of a variable frequency,
- wherein said power converter control apparatus comprises:
- a detector for detecting an amount of electricity generated at the direct-current side of the power converter,
- a high-pass filter for removing direct-current components from the detected amount of electricity,
- a q-axis voltage corrector for correcting said q-axis voltage command in accordance with an output signal from said high-pass filter and sending a second q-axis voltage command, and
- a frequency corrector for correcting said frequency command in accordance with an output signal from said high-pass filter,
- wherein an alternating-current voltage command is issued in accordance with output signals from said frequency corrector and said second q-axis voltage command.
Dependencies are inferred from the claim text.