T-shaped three-level inverter and neutral-point balance control method therefor

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

Active Publication Date: 2016-11-09
SHENZHEN GARLE ELECTRIC TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

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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 ne

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  • T-shaped three-level inverter and neutral-point balance control method therefor
  • T-shaped three-level inverter and neutral-point balance control method therefor
  • T-shaped three-level inverter and neutral-point balance control method therefor

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Embodiment Construction

[0057] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0058] 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-shaped three-level inverter, and discloses the input/output relation of all units and the functions of each unit in detail. The invention also discloses a neutral-point balance control method for the T-shaped three-level inverter based on voltage differential prediction. The method overcomes the limitations of a neutral-point balance control method based on zero sequence voltage injection in the prior art, i.e., a zero sequence voltage component being one or zero. Although the adjustment speed is high, a system is liable to lose control and the stability of the system is not facilitated. Moreover, there are more variables in conventional detection, and the calculation burden of a computer is heavy. The method is small in number of collected signals, and the speed of reduction of neutral-point voltage fluctuation is high. The method is low in hardware cost, is simple in program, is small in calculation burden, is high in practicality, is high in robustness, and can guarantee the full-range work stability of the inverter.

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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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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