Inverter control device and power conversion device

A technology of power conversion device and control device, which is applied in the direction of output power conversion device, AC motor control, control electromechanical transmission device, etc., and can solve the problems of bad influence of control and increase of output voltage, etc.
CN102017395AActive Publication Date: 2011-04-13DAIKIN IND LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
DAIKIN IND LTD
Publication Date
2011-04-13

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Abstract

A DC voltage value from a DC voltage detection unit (201) is directly inputted to a voltage correction unit (202) without using a compensator or a filter. Accordingly, a voltage correction unit (202) can rapidly perform a correction process even upon a sudden voltage change such as an instantaneous power supply stop, an instantaneous voltage lowering, or a recovery from an instantaneous voltage lowering. Moreover, since a limit unit (212) limits a link resonance compensation amount to a predetermined range, it is possible to prevent an excessive fluctuation of a link resonance compensation amount upon a sudden voltage change. Moreover, the link resonance compensation amount limited to the predetermined range by the limit unit (212) is inputted to a compensator (206) of an appropriate control band in control calculation units (204 - 208). Accordingly, it is possible to avoid response of a higher speed than is necessary and perform stable control.
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Description

technical field

[0001] The present invention relates to a technique for controlling a DC-AC converter for driving an AC motor. Background technique

[0002] In general, in a voltage-type DC / AC conversion device having a smoothing capacitor in a DC link, constant output voltage control is performed to suppress fluctuations in the output voltage due to fluctuations in the DC input voltage. figure 1 A schematic configuration of a conventional DC / AC conversion device that performs constant output voltage control is shown. in addition, figure 1 In the diagram, the control system is briefly shown, and the output current detection unit 160 is arranged between the direct current conversion unit 140 and the motor 150, but any configuration can be used as long as the current output to the motor 150 can be detected. It is a configuration in which a shunt resistor is placed in the DC connection part to detect the current.

[0003] figure 1 The DC-to-AC conversion device includes a D...

Claims

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