Seven-level full-bridge active power filter based on novel topology and topology method

A power filter, seven-level technology, applied in active power filtering, electrical components, circuit devices, etc., can solve problems such as grid harmonic pollution, and achieve the effects of simple operation, reduced total cost, and reduced complexity

Inactive Publication Date: 2020-02-07
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

At present, the application of active power filters in my country is still dominated by low-voltage and small-capacity systems. Compared with developed c...

Method used

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  • Seven-level full-bridge active power filter based on novel topology and topology method
  • Seven-level full-bridge active power filter based on novel topology and topology method
  • Seven-level full-bridge active power filter based on novel topology and topology method

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Embodiment 1

[0039] (1) The working principle of the seven-level inverter topology of the improved H-bridge:

[0040] Such as figure 2 The seven-level inverter single-phase topology of the improved H-bridge is shown, which is formed by adding two switch tubes and a capacitor to the H-bridge inverter structure, where the voltage of the capacitor C1 is twice the voltage of the capacitor C2 times, that is, Uc1=2*Uc2, where the voltage of capacitor C1 and the voltage of capacitor C2 are 1 / 3 and 1 / 6 of the DC bus voltage respectively, and the maximum voltage that the switching tube can bear is only 1 / 6 of the DC bus voltage, so it can effectively reduce Reduce the number of switching tubes and reduce the withstand voltage level of switching tubes and DC capacitors.

[0041] The switching states of the novel 11-level neutral-point clamped active power filter proposed by the present invention are shown in Table 1, where U dc=3*U C2 .

[0042]

[0043] (2) Harmonic current detection

[004...

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Abstract

The invention discloses a seven-level full-bridge active power filter based on novel topology and a topology method. The seven-level full-bridge active power filter comprises an active power filter. The active power filter is composed of a carrier wave stacking core control unit, a signal detection circuit, a power supply circuit, a protection circuit, a driving unit and a power unit. A system main circuit is composed of an inductor connected with a power grid and a novel seven-level converter. The signal detection circuit and the power unit are connected with a three-phase alternating currentpower grid and a three-phase nonlinear load; the power unit is connected with the signal detection circuit; the signal detection circuit is connected with the carrier wave stacking core control unit;the carrier wave stacking core control unit is connected with the driving unit; and the driving unit is connected with the power unit. The seven-level full-bridge active power filter adopts novel 7-level APF topology, is obtained by increasing two switching tubes and one capacitor in an H-bridge inverter structure, and has the advantages of being small in the number of high-frequency switches, low in voltage of the switching tubes and the capacitor, easy to extend to multiple levels, large in number of output levels of the device, small in harmonic wave and the like.

Description

Technical field: [0001] The invention relates to a novel topology-based seven-level full-bridge active power filter and a topology method. Background technique: [0002] Active power filter is one of the key technologies for suppressing grid harmonics and compensating reactive power. At present, the application of active power filter in our country is still dominated by low-voltage and small-capacity systems. Compared with developed countries, there is a big gap in research and application level, which is not suitable for the increasingly serious harmonic pollution of domestic power grids. With the deepening of my country's power quality control work and the improvement of domestic attention to harmonic problems, active filter technology will be widely used in my country, and the market potential is huge. [0003] Compared with the two-level APF, it is found that the multi-level APF has obvious advantages. It not only reduces the withstand voltage requirements of the power ...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/1821Y02E40/20
Inventor 高晗璎李志影胡增山刘旭
Owner HARBIN UNIV OF SCI & TECH
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