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AC rotating machine control device

A technology for control devices and rotating electrical machines, which is applied in the direction of AC motor control, electromechanical transmission control, motor generator control, etc. It can solve problems such as adverse effects and harmonic component amplification, and achieve the effect of suppressing excessive overmodulation

Active Publication Date: 2021-09-21
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in the power connection path connected to the inverter and the DC power supply, the LC resonance circuit is formed by the smoothing capacitor of the inverter, and when the frequency of the harmonic component of the power supply current matches the resonance frequency of the power connection path, the power supply current The harmonic components of the DC power supply are amplified, which may cause adverse effects on the DC power supply and other devices connected to the DC power supply

Method used

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  • AC rotating machine control device
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Examples

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Embodiment approach 1

[0038] An AC rotating electric machine control device 1 (hereinafter simply referred to as the control device 1 ) according to Embodiment 1 will be described with reference to the drawings. figure 1 It is a schematic configuration diagram of the AC rotating electrical machine 2 and the control device 1 according to the present embodiment.

[0039] 1-1. AC rotary motor

[0040] The AC rotating electric machine 2 has a stator and a rotor provided with multi-phase windings. In this embodiment, three-phase coils Cu, Cv, and Cw of U-phase, V-phase, and W-phase are provided. Set three-phase winding Cu, Cv, Cw for star connection. In addition, it is also possible to set up a three-phase winding for delta connection. The AC rotating electrical machine 2 is a permanent magnet type synchronous rotating electrical machine, and a permanent magnet is provided on a rotor.

[0041] The AC rotating electrical machine 2 includes a rotation sensor 16 that outputs an electrical signal corres...

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Abstract

Provided is an AC rotating machine control device capable of suppressing an actual modulation rate from exceeding a target value of the modulation rate or suppressing a stable deviation from the target value of the modulation rate. The AC rotating machine control device (1) calculates an actual value (Mr) of a modulation rate, which is a ratio of an amplitude of a fundamental component of an applied voltage to a half value of a power supply voltage (VDC), on the basis of a voltage command value and a detected value (VDC) of the power supply voltage, and calculates a predicted value (Mrp) of the actual value of the modulation rate on the basis of the actual value (Mr) of the modulation rate. The current command value is varied such that a predicted value (Mrp) of the actual value of the modulation rate approaches a target value of the modulation rate.

Description

technical field [0001] The present application relates to a control device for an AC rotating electric machine. Background technique [0002] In AC rotating electric machine control devices, in order to improve efficiency and increase output, the amplitude of the voltage applied to the three-phase windings is sometimes controlled to be in an overmodulated state exceeding half of the power supply voltage. On the other hand, if the control is in an overmodulation state, the voltage applied to the winding includes a harmonic component, and the power supply current also includes a harmonic component. In addition, in the power connection path connected to the inverter and the DC power supply, the LC resonance circuit is formed by the smoothing capacitor of the inverter, and when the frequency of the harmonic component of the power supply current matches the resonance frequency of the power connection path, the power supply current The harmonic components of the DC power supply a...

Claims

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Application Information

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IPC IPC(8): H02P27/08H02P21/14H02P21/05
CPCH02P27/08H02P21/14H02P21/05
Inventor 原田信吾
Owner MITSUBISHI ELECTRIC CORP
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