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A three-level inverter and its bus voltage balance control method and control device

A three-level inverter, three-level inverter technology, applied in the output power conversion device, electrical components, AC power input into DC power output and other directions, can solve the problem of slow discharge speed, increased hardware cost, restart Long waiting time etc.

Active Publication Date: 2018-05-25
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The principle of this method is simple, but due to the power limitation of the discharge circuit, the discharge speed is slow, usually on the order of minutes, so the restart waiting time is longer; and the hardware cost is increased

Method used

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  • A three-level inverter and its bus voltage balance control method and control device
  • A three-level inverter and its bus voltage balance control method and control device
  • A three-level inverter and its bus voltage balance control method and control device

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Embodiment Construction

[0029] 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.

[0030] see image 3 , the embodiment of the present invention discloses a bus voltage balance control method for a three-level inverter, so as to quickly restore the bus voltage balance state of the three-level inverter without increasing hardware costs, including:

[0031] Step 301: In the shutdown state of the three-level inverter, obtain VPos and VNeg, wherein VPos and VNeg represent the modulus values ​​of the positive and negative bus voltages of the thre...

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Abstract

The invention discloses a three-level inverter and a bus voltage balance control method and control apparatus therefor. The control method comprises the steps of if judging that VPos-VNeg is greater than Vthrs in a down state of the three-level inverter, controlling S2 and S0 to be subjected to complementary breakover, and keeping the S1 turned off until that VPos-VNeg is less than or equal to Vthrs, restoring the down state of the three-level inverter; and if judging that VNeg-VPos is greater than Vthrs, controlling S1 and S0 to be subjected to complementary breakover, and keeping the S2 turned off until that VNeg-VPos is less than or equal to Vthrs, restoring the down state of the three-level inverter, wherein S2, S0 and S1 are representing switch tubes that are correspondingly switched on when the three-level inverter outputs the levels of +VPos, 0 and -Vneg. The three-level inverter can rapidly restore the bus voltage balancing state without increasing the hardware cost.

Description

technical field [0001] The present invention relates to the technical field of power electronics, and more specifically, relates to a three-level inverter and its bus voltage balance control method and control device. Background technique [0002] The main circuit structure of the three-level inverter is as follows: figure 1 As shown, it includes a three-level inverter bridge 100, an output filter circuit 200, a grid-connected switch 300, a positive bus capacitor C2 and a negative bus capacitor C1, etc., wherein: C2 and C1 are connected in series to support and balance the bus voltage (that is, the three-level The DC side voltage of the inverter bridge 100); the so-called bus voltage balance means that the modulus values ​​of the positive bus voltage VPos and the negative bus voltage -VNeg are equal, and it is considered in engineering that as long as the deviation between the two does not exceed the maximum allowable deviation value Vthrs, it can be regarded as a bus volta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483
Inventor 丁杰潘年安邹海晏陶磊
Owner SUNGROW POWER SUPPLY CO LTD
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