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

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 ...

AI Technical Summary

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 countries, there is a large gap in research and application levels. This is not suitable for the increasingly serious harmonic pollution of domestic power grids.

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