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Control device and control method for four-quadrant converter

A four-quadrant converter and control device technology, applied in output power conversion devices, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of low input power factor, bad sine, and high harmonic content of input current , to achieve the effect of reducing the input harmonic content and improving the power factor

Inactive Publication Date: 2013-06-05
CHINA CNR CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the control of the four-quadrant converter mainly adopts the double closed-loop structure of the voltage outer loop and the current inner loop, including the voltage controller and the current controller. When above, due to the relatively high input current harmonics, the sinusoidal degree is not good, and the input power factor is relatively low
Especially in the case that the switching frequency of the four-quadrant converter is low due to the low characteristics of the switching device, the worse the sine degree of the input waveform, the lower the input power factor

Method used

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  • Control device and control method for four-quadrant converter
  • Control device and control method for four-quadrant converter

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Embodiment 1

[0024] figure 1 It is a schematic structural diagram of a control device for a four-quadrant converter provided in Embodiment 1 of the present invention. Such as figure 1 As shown, the control device for the four-quadrant converter provided in this embodiment can be specifically applied to the control of the four-quadrant converter 11 .

[0025] The control device for the four-quadrant converter provided in this embodiment specifically includes a voltage sampling module 12 , at least two current sampling modules 13 , a voltage control module 14 , at least two current control modules 15 and at least two pulse width modulation modules 16 . The voltage sampling module 12 is connected to the output of the four-quadrant converter group, and the voltage sampling module 12 is used to sample the output voltage of the four-quadrant converter group to generate a voltage sampling signal, wherein the four-quadrant converter group includes outputs connected in parallel At least two four-...

Embodiment 2

[0032] figure 2 It is a schematic structural diagram of a voltage control module of a control device for a four-quadrant converter provided in Embodiment 2 of the present invention. Such as figure 2 As shown, the control device for the four-quadrant converter provided in this embodiment is based on the first embodiment, and the voltage control module 14 may specifically include a first comparator 141 , a proportional-integral controller 142 and a multiplier 143 . The first comparator 141 is connected to the voltage sampling module 12, and the first comparator 141 is used to compare the voltage sampling signal with a given voltage to generate a voltage error signal. The proportional-integral controller 142 is connected to the first comparator 141, and the proportional-integral controller 142 is used for controlling and adjusting according to the error signal to generate a first current command. The multiplier 143 is connected to the proportional-integral controller, and the...

Embodiment 3

[0037] Figure 4 It is a flow chart of the control method of the four-quadrant converter provided by the third embodiment of the present invention. Such as Figure 4 As shown, the control method for the four-quadrant converter provided in this embodiment can be specifically implemented in the control device for the four-quadrant converter provided in any embodiment of the present invention, which will not be repeated here.

[0038] The control method of the four-quadrant converter provided in this embodiment specifically includes:

[0039] Step 10, the voltage sampling module samples the output voltage of the four-quadrant converter group to generate a voltage sampling signal, wherein the four-quadrant converter group includes at least two four-quadrant converters connected in parallel;

[0040] Step 20, the voltage control module generates a first current command according to a given voltage and a voltage sampling signal, and generates a second current command according to ...

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Abstract

The invention provides a control device and a control method for a four-quadrant converter. The control device comprises a voltage sampling module, at least two current sampling modules, a voltage control module, at least two current control module and at least two pulse width modulation (PWM) modules. The voltage control module generates a first current instruct according to a given voltage and a voltage sampling signal generated by the voltage sampling module, and generates a second current instruct according to the first current instruct and a collected grid phase. The at least two current control modules generate modulation voltage instructs according to the second current instruct and current sampling signals generated by the at least two current sampling modules. The at least two PWM modules regulate a carrier phase preset value, and generate and output PWM signals according to the carrier phase preset value and the modulation voltage instructs. The control device and the control method for the four-quadrant converter enable specified subharmonics in output current of a plurality of four-quadrant converters to be mutually offset, and therefore the purpose of reducing input harmonic content is achieved, and the power factor is improved.

Description

technical field [0001] The invention relates to electric equipment control technology, in particular to a control device and method for a four-quadrant converter. Background technique [0002] The four-quadrant converter is a power electronic conversion device, because its energy can flow in both directions, the output DC voltage is constant, the input power factor is high, and the harmonic content is small, it is widely used in AC drive electric locomotives and has relatively high requirements for power quality. High industrial converters. [0003] In the prior art, the control of the four-quadrant converter mainly adopts the double closed-loop structure of the voltage outer loop and the current inner loop, including the voltage controller and the current controller. When the power is on, due to the relatively high harmonic content of the input current, the sinusoidal degree is not good, and the input power factor is relatively low. Especially when the switching frequency...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02M1/42
CPCY02B70/126Y02B70/10
Inventor 耿辉邹代厚王雪迪
Owner CHINA CNR CORPORATION