Single-phase active power filter control method

Abstract

The invention discloses a single-phase active power filter control method which comprises the following steps: a single-phase active power filter mathematical model is established; the unknown part ofthe single-phase active power filter is approximated by using the double hidden layer regression neural network, and a double hidden layer regression neural network fractional sliding mode controlleris obtained; and the single-phase active power filter is controlled according to the double hidden layer regression neural network fractional sliding mode controller. The double hidden layer regression neural network comprises two hidden layers and two regression layers. The two hidden layers make the neural network have high fitting ability, and the two regression layers make the neural networkstore more information, have higher association ability and have better approximation effect. Compared with the intermittent order adjustment of integer order sliding mode control, fractional order sliding mode control has more adjustable order degrees of freedom, which makes the control results have better optimization space. The real-time tracking and compensation of the command current can be realized and the reliability is high.

Description

technical field [0001] The invention discloses a single-phase active power filter control method and relates to the technical field of single-phase active power filter control. Background technique [0002] The rapid development of power electronics technology has brought various conveniences to people's lives. However, with the large-scale use of various nonlinear electronic devices, it has brought harm to the power grid. For example, the switching action of power electronic devices will cause a large number of harmonic voltages or harmonic currents in the power grid, which seriously affects the power quality and increases Additional loss of power system equipment. [0003] At present, the methods of suppressing harmonics mainly include active filters and passive filters; at present, passive filters are mainly used in China to deal with harmonics in power grids. However, the compensation characteristics of passive filters are single, and are easily affected by system impe...

AI Technical Summary

Problems solved by technology

However, the compensation characteristics of passive filters are single, and are easily affected by system impedance, causing resonance phenomena, amplifying harmonics, and then burning compensation devices, and can only effectively deal with specific harmonics. People gradually shift the focus of research to single-phase Active power filters; compared with passive filters, active filters have the advantages of large dynamic range of harmonics that can be filtered out, and fast dynamic compensation for harmonic currents; although the cost of active filters is relatively high, However, with the increase of harmonic standard requirements, the cost of active filters will increase with the increase of filter branches, while the cost of active filters is almost unchanged, so active filters are considered to be the most important in the future Harmonic Suppression Device

[0004] At present, the advanced control theory system of single-phase active power filter has not been formed at home and abroad. The modeling method of active filter varies from person to person, and the control methods adopted are also various, which leads to the stability and reliability of the system. lower sex

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