Active power electric filter circuit based on three-phase bridge inversion circuit and work method thereof

Abstract

The present invention provides an active power electric filter circuit based on a three-phase bridge inversion circuit and a work method thereof, relates to a filter circuit, and especially relates to an active power electric filtering circuit based on the three-phase bridge inversion circuit. The present invention provides an active power electric filter circuit based on three-phase bridge inversion circuit and the work method thereof with small switch loss, the much number of output level, the high output voltage grade, the small output waveform fluctuation, the small electric power loss, the little number of direct current side capacitors, the simple control algorithm, small device size and low cost. The collector of a power switch tube 1 with an anti-parallel diode, the collector of a power switch tube with an anti-parallel diode and the collector of a power switch tube 5 with an anti-parallel diode are connected in order. The structure is simple, and the high level output is realized, the filtering effect is good, the output waveform is stable, the number of required devices is few, the loss is reduced and the package size is decreased.

Description

technical field [0001] The invention relates to a filter circuit, in particular to an active power filter circuit based on a three-phase bridge inverter circuit. Background technique [0002] As a new type of harmonic and reactive power compensation device, active power filter can realize dynamic compensation. At present, the most widely used main circuits of multi-level active power filters are diode-clamped and flying-capacitor-clamped. However, these main circuit topologies require a large number of power switch tubes, which increases the switching loss and device volume of the multi-level active power filter, and also greatly increases the cost of the device. [0003] The State Intellectual Property Office published an invention patent application on March 11, 2015 (application number: 2014107564236, name: an active filter system with a modular multilevel converter and its control method) using a cascaded , the use of switching tube devices is less, and the power consu...

AI Technical Summary

Problems solved by technology

Using cascading, there are many capacitors on the DC side, and the control algorithm is complex

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