Kabushiki Kaisha Yaskawa Denki

Other

Toshihiro Hanada

Hideaki Iura

Keisei Inoki

Shinichi Akimoto

Hiroyuki Imayoshi

Mitsunori Sato

Takahiro Saeki

Masashiro Tanaka

Hirotaka Karakama

Yoichi Yano

Shoji Konakahara

Takahiro Uchino

Ryusuke Komiya

Kengo Nakahara

A power conversion deviceincludes a matrix converter circuitincluding a plurality of switching elements and being configured to perform bidirectional power conversion between alternating current power on a primary side and alternating current power on a secondary side, a power conversion control unitconfigured to switch on and off the plurality of switching elements in unison with a carrier wave to cause an alternating current on the secondary side to follow a control command, and a carrier wave changing unitconfigured to change, based on a nearness level between a frequency on the primary side and a frequency on the secondary side, a frequency of the carrier wave.

Power conversion device, power conversion method, and program

The power conversion device may include: power conversion circuitry configured to perform a power conversion for outputting a driving power to an induction motor; and control circuitry. The control circuitry may be configured to: receive a master command phase from a master power conversion device; generate a voltage command having a command phase in a rotating coordinate system based on a torque target value, wherein a rotating magnetic field for driving a rotor of the induction motor is generated to rotate with the rotating coordinate system; calculate a rotation phase of the rotating coordinate system based on a command phase difference between the master command phase and the command phase to reduce the command phase difference; and control the power conversion circuitry to output the driving power to the induction motor, in synchronization with the master power conversion device, based on the rotation phase and the voltage command.

Power conversion device

A power conversion apparatus includes: matrix converter circuitry configured to perform bidirectional power conversion between a primary side and a secondary side; and control circuitry configured to: calculate a deterioration level based on a secondary side current of the matrix converter circuitry, a carrier frequency, and a primary-secondary frequency difference between a primary side frequency and a secondary side frequency of the matrix converter circuitry; and output a deterioration notification in response to determining that the deterioration level exceeds a predetermined level.

Bidirectional power conversion

A power conversion device includes a power conversion circuitry configured to convert DC power into AC power by switching on/off a plurality of switching elements to switch each of a plurality of phase voltages to a voltage level selected from one of three levels including a first voltage, a second voltage higher than the first voltage, and a third voltage higher than the second voltage. A control circuitry is configured to control the plurality of switching elements so as to convert DC power into AC power without producing a combination of the first voltage and the third voltage between any two phases of the plurality of phase voltages.

Power conversion device with selective voltage control

A matrix converter includes a power converter circuit connectable on one side thereof with an alternating-current supply via a high-frequency filter and connectable on another side thereof with an alternating-current motor; a snubber circuit connected with a one-side line for connecting the high-frequency filter and the power converter circuit; a discharge switch discharging a charge accumulated in the snubber circuit depending on a voltage of the snubber circuit; and a control circuit configured to execute controlling the power converter circuit on the basis of a carrier frequency in test such that a test voltage is applied to the alternating-current motor, changing the carrier frequency in test on the basis of an operation state of the discharge switch, and determining constants of the alternating-current motor on the basis of a response state of the alternating-current motor at the time when the test voltage is applied.

Matrix converter and method for determining constants of alternating-current motor

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Fukuoka, Japan

Toshihiro Hanada