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Title:
CONTROL DEVICE AND CONTROL METHOD FOR PLURALITY OF POWER CONVERTERS
Document Type and Number:
WIPO Patent Application WO/2019/138620
Kind Code:
A1
Abstract:
When a control device comprising a plurality of control units controls a plurality of power converters for converting a DC power interposed by a plurality of smoothing filter capacitors to an AC power and each supplying the AC power to an AC motor, a current command narrowed amount is unbalanced between the control units due to a detection error of the filter capacitor voltage and therefore an imbalance between the control units occurs also in a regenerative power amount. In order to solve this problem, this control device is provided with: a plurality of voltage detectors for detecting the voltages of respective smoothing filter capacitors; a plurality of first control units for separately controlling respective power converters on the basis of the voltage detection values obtained from the voltage detectors corresponding to the power converters; and a second control unit for calculating a common current command narrowed amount for the plurality of first control units on the basis of the respective voltage detection values obtained from the plurality of voltage detectors and outputting the common current command narrowed amount to the respective first control units. Each of the first control units performs control on the basis of the common current command narrowed amount output by the second control unit during light load regenerative control.

Inventors:
LI, Kang (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
SHINOMIYA, Takeshi (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
ISHIKAWA, Katsumi (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
Application Number:
JP2018/037585
Publication Date:
July 18, 2019
Filing Date:
October 09, 2018
Export Citation:
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Assignee:
HITACHI, LTD. (6-6 Marunouchi 1-chome, Chiyoda-ku Tokyo, 80, 〒1008280, JP)
International Classes:
H02M7/48; B60L9/18
Foreign References:
JP2008005620A2008-01-10
JP2009072049A2009-04-02
JP2002159104A2002-05-31
Attorney, Agent or Firm:
Patent Corporate Body Dai-ichi Kokusai Tokkyo Jimusho (5-12, Iwamotocho 3-chome Chiyoda-k, Tokyo 32, 〒1010032, JP)
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