Terminal sliding mode control method for active power filter

Abstract

The invention discloses a terminal sliding mode control method for an active power filter, and the method comprises the following steps: S1, establishing a single-phase active power filter mathematical model, defining a state variable i as x, and obtaining an expression of a second derivative of x; S2, defining a tracking error and a first derivative thereof, defining a terminal sliding mode surface to obtain an equivalent control item, then defining a switching control item, and adding the equivalent control item and the switching control item to obtain a terminal sliding mode controller; S3, approximating the equivalent control item by using a double-hidden-layer recurrent neural network. According to the invention, the method can maintain the stability of an original controller, can simplify the control law, can achieve the better control precision, effectively reduces the distortion rate of power grid current, and improves the active power filter compensation effect.

Description

technical field [0001] The invention particularly relates to a terminal sliding mode control method of an active power filter, which belongs to the technical field of intelligent control. Background technique [0002] At present, the development of power electronic technology has brought great convenience to industrial production and personal life, but it also has great negative effects. wave, the grid circuit is no longer a standard sine wave. The existence of harmonic currents often affects the quality of the power grid, causing various circuit problems, and even fires in severe cases. Therefore, how to suppress harmonic currents is a research hotspot in today's power grid system. [0003] The common harmonic suppression method is passive filter, which has become the most widely used harmonic compensation method in the industrial field due to its convenient installation and low cost. But the passive filter can only compensate the harmonic current of a specific harmonic, ...

AI Technical Summary

Problems solved by technology

A large part of the harmonic compensation performance of the active power filter is limited by the control method, and some existing control methods cannot maximize the advantages of the active power filter

This is because the control accuracy of the traditional control method is often not high, which leads to the performance of the active power filter cannot be fully utilized, and a better compensation effect cannot be achieved.

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