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A T-type three-level inverter and its midpoint balance control method

A three-level inverter, midpoint technology, applied in electrical components, conversion devices for converting AC power input to DC power output, output power, etc., can solve the midpoint voltage fluctuation, complex control process, and poor adjustment speed And other issues

Active Publication Date: 2019-01-11
SHENZHEN GARLE ELECTRIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the midpoint voltage fluctuation problem is an important common problem in three-level inverters
This method can not only reduce the switching loss, but also balance the midpoint voltage, but the need to switch will cause control errors and the adjustment speed is poor
To sum up, the above methods all need to detect multiple variables at the same time, and the control process is relatively complicated.

Method used

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  • A T-type three-level inverter and its midpoint balance control method
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  • A T-type three-level inverter and its midpoint balance control method

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Embodiment Construction

[0058] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0059] Such as figure 1As shown, it is a schematic diagram of the application environment of the mid-point balance control method based on voltage differential prediction of the T-type three-level inverter of the present invention. The circuit structure of the non-isolated T-type three-level grid-connected inverter includes the positive pole of the DC voltage Udc connected to the positive pole of the capacitor Cp on the DC bus, the collector of the first switching tube Sa1, the collector of the second switching tube Sb1, the third The collector of the switching tube Scl; the negative pole of the DC voltage Udc is respectively connected with the negative pole of the capacitor Cn under the DC bus, the emitter of the fourth switching tube Sa4, the emitter of the fifth switching tube Sb4, and the emitter of the sixth switching tube Sc4; The negativ...

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Abstract

The invention discloses a T-type three-level inverter, which discloses in detail the input-output relationship of each unit and their respective functions; point balance control method. The invention overcomes the limitations of the neutral point voltage balance control method based on zero-sequence voltage injection in the prior art, that is, the zero-sequence voltage component factor is either 1 or 0. Although the adjustment speed is fast, the system is easy to get out of control, which is not conducive to the stability of the system In addition, there are many variables in the traditional detection method, and the computer has a large amount of calculation. The method of the invention has the advantages of less signal collection, fast reduction of mid-point voltage fluctuation, low hardware cost, simple program, small calculation amount, strong practicability, strong robustness, etc., and can ensure the stability of the inverter in the whole range. .

Description

technical field [0001] The invention belongs to the technical field of three-level grid-connected inverter control, and specifically relates to a T-type three-level inverter, and the invention also relates to the midpoint balance control of the T-type three-level inverter based on voltage differential prediction method. Background technique [0002] In recent years, the three-level inverter has become one of the ideal choices for high-voltage and high-power applications due to its advantages of large capacity, high withstand voltage level, low output current harmonic content, and low switching loss. Among the many three-level topologies, the T-type three-level inverter uses fewer devices than other three-level inverter topologies. When outputting positive and negative levels, the current flows through fewer devices, and the corresponding The conduction loss is less, especially at present, the output voltage of the photovoltaic array does not exceed 1000V, and the T-type thr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M1/0012H02M7/4835
Inventor 安少亮李均妮孙向东王建渊杨惠
Owner SHENZHEN GARLE ELECTRIC TECH CO LTD
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