Control apparatus for AC motor

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: 2014-01-01
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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  • Control apparatus for AC motor
  • Control apparatus for AC motor
  • Control apparatus for AC motor

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. Such as 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...

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PUM

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Abstract

The purpose of the present invention is to attain a control apparatus for an AC motor, wherein electrical oscillation of an LC filter circuit can be inhibited even when the magnitude of a torque command is small or nearly zero, and driving of an AC motor can be controlled with stability. The control apparatus for an AC motor controls the driving of an AC motor (6), and is provided with a damping control unit (40) that calculates the amount of damping to be executed for inhibiting fluctuation of a capacitor voltage. The damping control unit (40) calculates the fluctuation degree of the capacitor voltage, calculates the amount of damping to be executed on the basis of this fluctuation degree and a prescribed value set as a value within a prescribed range centering around the maximum torque of the AC motor, generates a torque command or a current command for the AC motor (6) on the basis of this amount of damping to be executed, and controls the current flowing through an inverter (4) to change so as to inhibit the fluctuation of the capacitor voltage, on the basis of the torque command or the current command.

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 Applications(China)
IPC IPC(8): H02P27/06H02P21/00H02P21/05H02P21/22H02P23/04H02P23/07H02P27/04
CPCH02P6/002H02P21/05H02P21/04H02P27/08H02P2205/05B60L15/025B60L2240/421B60L2240/423B60L2240/427B60L2240/429H02P6/28B60L50/51Y02T10/64Y02T10/70
Inventor 北中英俊
Owner MITSUBISHI ELECTRIC CORP
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