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Overmodulation control method and device

A control method and over-modulation technology, which is applied in the direction of converting irreversible DC power input into AC power output, can solve problems such as low control accuracy, and achieve the effect of improving efficiency and solving low control efficiency.

Active Publication Date: 2015-03-25
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Embodiments of the present invention provide an overmodulation control method and device to at least solve the technical problem of low control accuracy when using the existing method for overmodulation control

Method used

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  • Overmodulation control method and device

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Embodiment 1

[0029] According to an embodiment of the present invention, an embodiment of an overmodulation control method is provided, such as figure 1 As shown, the method includes: .

[0030] S102. Obtain a first reference voltage and a second reference voltage, wherein the values ​​of the first reference voltage and the second reference voltage are obtained by transforming the alternating current in the control circuit;

[0031] S104. Calculate the vector angle and modulation ratio of the voltage vector to be modulated according to the first reference voltage and the second reference voltage;

[0032] S106, judge whether the vector angle of the voltage vector to be modulated is within the overmodulation angle range corresponding to the modulation ratio, and when it is judged that the vector angle is outside the overmodulation angle range, compare the voltage vector to be modulated in the control circuit according to the modulation ratio Overmodulation control is performed.

[0033] O...

Embodiment 2

[0083] According to an embodiment of the present invention, an overmodulation control device for implementing the above overmodulation control method is also provided, such as Figure 6 As shown, the device includes:

[0084] 1) An acquisition unit 602, configured to acquire a first reference voltage and a second reference voltage, wherein the values ​​of the first reference voltage and the second reference voltage are obtained by transforming the AC current in the control circuit;

[0085] 2) Calculation unit 604, configured to calculate the vector angle and modulation ratio of the voltage vector to be modulated according to the first reference voltage and the second reference voltage;

[0086] 3) a first judging unit 606, configured to judge whether the vector angle of the voltage vector to be modulated is within the overmodulation angle range corresponding to the modulation ratio;

[0087] 4) The control unit 608 is configured to perform over-modulation control on the volt...

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Abstract

The invention discloses an overmodulation control method and device. The method includes the steps that a first reference voltage and a second reference voltage are obtained, wherein the value of the first reference voltage and the value of the second reference voltage are obtained according to AC transformation in a control circuit; a vector angle and a modulation ratio of a voltage vector to be modulated are calculated according to the first reference voltage and the second reference voltage; whether the vector angle of the voltage vector to be modulated is within an overmodulation angle range corresponding to the modulation ratio is judged, and when it is judged that the vector angle is out of the overmodulation angle range, overmodulation control is performed on the voltage vector to be modulated in the control circuit according to the modulation ratio. The overmodulation control method and device solve the technical problem that control accuracy is low when an existing mode is adopted to perform overmodulation control.

Description

technical field [0001] The present invention relates to the field of electronic circuits, in particular to an overmodulation control method and device. Background technique [0002] At present, in the control process of the existing inverter circuit, the overmodulation method usually adopted is Space Vector Pulse Width Modulation (SVPWM, Space Vector Pulse Width Modulation), that is to say, it is judged that the vector to be controlled is in each sector of the space vector The overmodulation area where it is located, and then according to the modulation ratios corresponding to different overmodulation areas, overmodulation control is performed on the above vector. However, the modulation ratios of the above-mentioned different over-modulation regions are all obtained only based on the output voltage amplitude. Since the output voltage amplitude has no deviation within one cycle of over-modulation, this leads to the use of traditional over-modulation control methods, not only...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
CPCH02M7/48
Inventor 景铁龙武建飞胡晰怡
Owner GREE ELECTRIC APPLIANCES INC