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Three-phase three-wire inverter and its output current control method and control system

A three-phase three-wire, output current technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as bus voltage imbalance, sampling deviation, transformer saturation, etc., to avoid the introduction of common mode signals and suppress DC components Effect

Active Publication Date: 2018-09-28
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0002] Theoretically, the output current of the three-phase three-wire inverter is sinusoidal alternating current, but in actual application, it is affected by factors such as bus voltage imbalance, circuit parameter deviation, sampling deviation, and switch tube parameter difference, resulting in the actual three-phase three-wire Inevitably there will be a DC component in the inverter output current
If effective measures are not taken to suppress the DC component in the output current of the three-phase three-wire inverter, the operating point of the connected transformer may shift, resulting in transformer saturation and other problems.

Method used

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  • Three-phase three-wire inverter and its output current control method and control system

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Embodiment Construction

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0042] see figure 1 , the embodiment of the present invention discloses a three-phase three-wire inverter output current control method to achieve the purpose of suppressing the DC component in the output current of the three-phase three-wire inverter, including:

[0043] Step S01: Sampling respectively to obtain the DC component and the AC component in the output current of the three-phase three-wire inverter;

[0044] Step S02: performing common-mode and di...

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Abstract

The application discloses a three-phase three-wire inverter and its output current control method and control system. The control method includes: separately sampling the DC component and the AC component in the output current of the three-phase three-wire inverter; The component is separated from the common mode and the differential mode, and the differential mode signal is extracted; the differential mode signal is processed by the regulator; the processed differential mode signal is superimposed on the AC component, which is used as the feedback value of the current loop; wherein, the The current loop described above is used to control the output current of the three-phase three-wire inverter at a given value, thereby achieving the purpose of suppressing the DC component in the output current of the three-phase three-wire inverter.

Description

technical field [0001] The present invention relates to the technical field of power electronics, and more specifically, relates to a three-phase three-wire inverter and its output current control method and control system. Background technique [0002] Theoretically, the output current of the three-phase three-wire inverter is sinusoidal alternating current, but in actual application, it is affected by factors such as bus voltage imbalance, circuit parameter deviation, sampling deviation, and switch tube parameter difference, resulting in the actual three-phase three-wire It is inevitable that there will be a DC component in the output current of the control inverter. If effective measures are not taken to suppress the DC component in the output current of the three-phase three-wire inverter, the operating point of the connected transformer may shift, resulting in transformer saturation and other problems. Contents of the invention [0003] In view of this, the present i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14
CPCH02M1/14H02M1/0003H02M1/0038
Inventor 张涛罗伟伟
Owner SUNGROW POWER SUPPLY CO LTD
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