Non-singular terminal sliding mode control method of active power filter based on single feedback neural network

Abstract

The invention discloses a non-singular terminal sliding mode control method of an active power filter based on a single feedback neural network, which is characterized by comprising the following steps of: step 1, establishing a mathematical model of the active power filter; step 2, approximating an unknown part of the system by utilizing the single feedback neural network to obtain a single feedback neural network non-singular terminal sliding mode controller which comprises a control law and an adaptive law; and step 3, controlling the active power filter according to the single feedback neural network non-singular terminal sliding mode controller. The method has the advantages that the single feedback neural network can randomly set a central vector and an initial value of a base width,and the central vector and the base width can be automatically stabilized to an optimal value along with a designed adaptive algorithm according to different inputs. The non-singular terminal slidingmode control not only can enable the system state to converge rapidly within a limited time, but also avoid the singularity problem of a common terminal sliding mode. The method can achieve the real-time tracking compensation of the instruction current, and is high in reliability.

Description

technical field [0001] The invention relates to a non-singular terminal sliding mode control method of an active power filter based on a single feedback neural network, in particular to a non-singular terminal sliding mode control method of an active power filter based on a single feedback neural network in three-phase parallel Application in the control of voltage type active power filter. Background technique [0002] Due to the rapid development of power electronics technology, a large number of electronic devices have poured into all walks of life. However, with the large-scale use of various nonlinear electronic devices, such as rectifiers and switching power supply devices, the harm they bring is becoming more and more serious. 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 the extra loss of power system equipm...

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Problems solved by technology

[0004] At present, there is no advanced control theory system for systematic active power filters at home and abroad. The modeling methods of active power filters vary from person to person, and the control methods adopted are also various, resulting in relatively low stability and reliability of the system. Low

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