Method for controlling voltage output of hybrid H-bridge cascaded inverter

A cascading inverter, voltage output technology, applied in output power conversion devices, electrical components, single-grid parallel feeding arrangements, etc., can solve problems such as increasing switching loss, reducing efficiency, and increasing the number of power switches. Achieve the effect of improving conversion efficiency and reducing the number of power switches

Inactive Publication Date: 2011-09-28
TSINGHUA UNIV +1
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Problems solved by technology

However, if this modulation method is not controlled, when the voltage output by the H-bridge inverter unit 11 is converted, the switching times of the power switch will increase, thereby increasing the switching loss and reducing the efficiency.

Method used

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  • Method for controlling voltage output of hybrid H-bridge cascaded inverter
  • Method for controlling voltage output of hybrid H-bridge cascaded inverter
  • Method for controlling voltage output of hybrid H-bridge cascaded inverter

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] The method of the present invention is based on "the grid-connected controller 4 controls the switching states of the power switches Sa1-4 of the H-bridge inverter 1, so that the AC side of each H-bridge inverter unit 11 outputs 1, -1 and 0 three different voltages, so as to control the working state of the H-bridge inverter 1", so that the H-bridge inverter 1 can output more kinds of voltages, so that the voltage output by the AC side of the H-bridge inverter 1 changes with time The waveform is better close to the ideal sine wave waveform, which meets the requirements of grid connection. The inventive method comprises the following steps:

[0033] 1) if figure 2 , image 3 As shown, an H-bridge inverter 1 with a DC voltage source of 3 voltage levels is set: the structure of the H-bridge inverter 1 is the same as the existing structure, the...

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Abstract

The invention relates to a method for controlling voltage output of a hybrid H-bridge cascaded inverter. The method comprises the following steps of: 1) installing an H-bridge inverter of a direct-current voltage source having 3 voltage stages, wherein the voltage stages of three direct-current buses are represented by low voltage V1=V0, middle voltage V2=2V0 and high voltage V3=4V0, and a total output voltage value V on the alternating-current side of the H-bridge inverter 1 is in accordance with the equation V=x*V1+y*V2+z*V3; 2) presetting an ideal sine wave in a synchronization controller in an inverter system; and 3) controlling an on or off state of a power switch in the H-bridge inverter by the synchronization controller by a voltage stage modulation method or a carrier pulse width modulation method so that a total output waveform on the alternating-current side of the H-bridge inverter approximates to the preset ideal sine waveform. By the method, the switching loss can be reduced and the energy conversion efficiency can be improved.

Description

technical field [0001] The present invention relates to a method for controlling the voltage output of an inverter, in particular to a method for controlling the voltage output of a hybrid H-bridge cascaded inverter (hereinafter referred to as "H-bridge inverter"). Background technique [0002] Currently, if figure 1 As shown, the inverter system includes an H-bridge inverter 1 for DC (direct current, direct current)-AC (alternating current, alternating current) conversion, a direct current power supply 2, a filter 3, a grid-connected controller 4 and a sampling unit ( not shown in the figure). Among them, such as figure 2 As shown, the H-bridge inverter 1 includes three H-bridge inverter units 11 connected in series, and each H-bridge inverter unit 11 is powered by a DC power supply (such as figure 1 V in 1 , V 2 and V 3 ), each DC power supply is connected to the H-bridge inverter unit 11 through a DC bus. The H-bridge inverter unit 11 includes power switches Sa1, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M1/12
Inventor 孙凯陆晓楠马毅为黄立培五十岚征辉
Owner TSINGHUA UNIV
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