Title:
POWER CONVERSION DEVICE AND POWER CONVERSION DEVICE CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2017/018209
Kind Code:
A1
Abstract:
Provided is a power conversion device equipped with a power-swing detection function for a rotary machine with an embedded permanent magnet, and also provided is an apparatus (for example, a rotary machine driving apparatus or refrigeration apparatus) using the power conversion device. The power conversion device comprises the following: a frequency detection unit for generating a digital signal having information on the rotation speed, rotation direction, and magnetic pole position of the rotary machine, such digital signal generated on the basis of the induced voltage of the rotary machine when the rotary machine is in a free run state; a speed reproducer for estimating the rotation speed, rotation direction, and magnetic pole position of the rotary machine on the basis of the digital signal generated in the frequency detection unit; and a power-swing determination unit for determining the power swing state of the rotary machine on the basis of the rotation speed, rotation direction, and magnetic pole position estimated by the speed reproducer.
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Inventors:
IWASE YUUTA (JP)
OHASHI HIRONORI (JP)
TAGUCHI YOSHIYUKI (JP)
KOBAYASHI YOUHEI (JP)
OHASHI HIRONORI (JP)
TAGUCHI YOSHIYUKI (JP)
KOBAYASHI YOUHEI (JP)
Application Number:
PCT/JP2016/070623
Publication Date:
February 02, 2017
Filing Date:
July 13, 2016
Export Citation:
Assignee:
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD (JP)
International Classes:
H02P6/16; H02P6/18
Foreign References:
| JP2009124870A | 2009-06-04 | |||
| JP2007166695A | 2007-06-28 |
Other References:
See also references of EP 3331151A4
Attorney, Agent or Firm:
INOUE Manabu et al. (JP)
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