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AC motor control device

An AC motor and control device technology, applied in AC motor control, motor control, motor generator control and other directions, can solve problems such as insufficient performance, and achieve the effect of suppressing electrical oscillation and stabilizing drive control

Active Publication Date: 2016-08-17
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For example, there is the following problem: if the torque command Tm * is zero, the attenuation operation amount DAMPCN cannot be used to operate the inverter input power Pinv, and when the capacitor voltage Efc oscillates due to interference such as overhead line voltage fluctuations, the performance of suppressing the oscillation of the capacitor voltage Efc is insufficient

Method used

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  • AC motor control device
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Examples

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Embodiment approach

[0023] figure 1 It is a block diagram showing a configuration example of the AC motor system of the embodiment. like figure 1 As shown, the AC motor system of this embodiment has: a DC power supply 1; an LC filter circuit composed of a reactor 2 and a capacitor 3 for suppressing the high-order harmonic current from flowing out to the power supply side; (capacitor voltage) Efc is converted into an inverter 4 of an arbitrary frequency AC voltage; an AC motor 6; and an AC motor control device 50 for driving and controlling the AC motor.

[0024] The AC motor control device 50 is composed of a vector control unit 30 and an attenuation control unit 40, and is input with a signal ωr from a speed detector 7 that detects the rotational speed of the AC motor 6, and signals from the current detectors 5a to 5c that detect the motor current. Iu, Iv, Iw, and the voltage Efc of the capacitor 3 . In addition, in the present embodiment, the current detectors are provided for each of the th...

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Abstract

The AC motor control device controls the drive of the AC motor (6), and includes an attenuation control unit (40) that calculates an attenuation operation amount that suppresses fluctuations in the capacitor voltage, and the attenuation control unit (40) calculates the fluctuation ratio of the capacitor voltage , based on the fluctuation ratio and a predetermined value, the damping operation amount is calculated, wherein the predetermined value is set as a value within a predetermined range centering on the maximum torque of the AC motor, and the damping control unit (40) based on the damping The torque command or current command of the AC motor (6) is generated by manipulating the quantity, and the control is performed based on the torque command or the current command, so that the current flowing through the inverter (4) changes in the direction of suppressing the voltage fluctuation of the capacitor.

Description

technical field [0001] The present invention relates to a control device for an AC motor for driving and controlling the AC motor. Background technique [0002] The technology of using an inverter to drive and control an AC motor has been widely used in the industry. This technology has been widely used in electric railways in the past, but when the above-mentioned system is applied to electric railways powered by direct current, it is known that the DC Electrical oscillation occurs in the LC filter circuit on the side of the capacitor, and the voltage across the capacitor (capacitor voltage) oscillates, making the control of the motor unstable. However, damping control for suppressing the above oscillation is disclosed in the following Patent Document 1 method. [0003] The following patent document 1 discloses a structure in which the damping operation amount, which is the square value of the fluctuation ratio of the capacitor voltage Efc, and the torque command Tm * ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/06H02P21/00H02P21/05H02P21/22H02P23/04H02P23/07H02P27/04
CPCH02P21/05H02P27/08H02P2205/05B60L15/025B60L2240/421B60L2240/423B60L2240/427B60L2240/429H02P6/28B60L50/51H02P21/04Y02T10/64Y02T10/70
Inventor 北中英俊
Owner MITSUBISHI ELECTRIC CORP
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