Hybrid active power filter and SVPWM method based on filter

Abstract

The invention discloses a hybrid active power filter and an SVPWM (Space Vector Pulse Width Modulation) method based on the filter. The hybrid active power filter comprises an active power filter (APF), single-tuned passive filters (PPFs) and an isolation transformator, wherein an inverter of the active power filter adopts a three-phase four-switch structure; four IGBT (Insulated-Gate Bipolar Transistor) devices form two bridge arms; a capacitor on the DC side forms a third bridge arm; the output terminal of the active power filter is connected with the secondary side of the isolation transformator; the secondary side of the isolation transformator is connected in parallel with a fundamental shunt inductor; and the primary side of the isolation transformator is connected in series with the seventh single-tuned passive filter and connected to a power grid after being connected in parallel with a non-linear load. According to the invention, the passive filters are used to filter the fifth, the seventh and eleventh major character harmonics caused by the non-linear load, meanwhile, a certain of reactive power is compensated, and branch circuits of the active power filter dynamically control the residual harmonics in real time.

Description

technical field [0001] The invention relates to a hybrid active power filter and a SVPWM method based on the filter, belonging to the technical field of power electronics. Background technique [0002] Electric energy is the main and indispensable important energy in the production and people's life of modern society. The increasingly serious harmonic pollution and the higher and higher power quality requirements form a pair of increasingly sharp contradictions. In recent years, due to the harmonic problem of the power grid, the supplementary capacitor cannot be put into operation due to frequent tripping, and even causes an explosion in severe cases. The microcomputer protection device often malfunctions or even refuses to operate, causing accidents. The existence of wave additional loss and the shortened service life have caused huge economic losses to power supply and power consumption enterprises. [0003] Enterprise electrical energy-saving new technologies and new equ...

AI Technical Summary

Problems solved by technology

The parallel resonant injection type APF does not have reactive power compensation capability; the capacity requirement of the series resonant injection type APF active filter is small, but it has a harmonic channel between the active power filter and the passive filter, causing active The compensation current injected by the power filter may flow into the passive filter and the system, which will unnecessarily increase the burden on the passive filter, and will also affect the effect of harmonic suppression

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