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Active power filter adaptive sliding mode control based on disturbance observation

A power filter, adaptive sliding mode technology, applied in active power filter, circuit device, AC network circuit, etc., can solve the problem of low current control accuracy

Active Publication Date: 2020-10-20
HOHAI UNIV CHANGZHOU
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the current control accuracy of the traditional control algorithm is not high, the present invention provides an adaptive sliding mode control of active power filter based on disturbance observation, which can quickly realize tracking without static error and achieve lower grid current distortion Rate

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  • Active power filter adaptive sliding mode control based on disturbance observation
  • Active power filter adaptive sliding mode control based on disturbance observation
  • Active power filter adaptive sliding mode control based on disturbance observation

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Embodiment Construction

[0090] In order to enable those skilled in the art to better understand the technical solutions in the application, the technical solutions in the embodiments of the application are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the application, and Not all examples. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0091] figure 1 It is the schematic diagram related to the present invention, figure 1 It shows that the harmonic current is detected from the load current by the sensor as the reference signal r. Firstly, a fast non-singular terminal sliding mode surface is designed, and the equivalent control term u can be obtained according to the sliding mode surface eq ;Secondly, considering the unknown disturbance of the system, using the state variable ...

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Abstract

The invention discloses an active power filter adaptive sliding mode control method based on interference observation, and the method comprises the following steps: S1, defining a switching function H, building a single-phase active power filter kinetic equation according to the definition of the switching function H and the Kirchhoff theorem, and obtaining a universal mathematic model of a secondderivative of x; S2, defining a differential equation of a finite time disturbance observer; S3, defining a tracking error, a first-order derivative of the tracking error and a fast nonsingular terminal sliding mode surface, solving an equivalent control item through the sliding mode surface, solving a disturbance compensation item through a disturbance observer differential equation, and obtaining an ideal fast nonsingular terminal sliding mode control law; and S4, constructing a double-hidden-layer recurrent neural network, outputting a switching gain approaching a switching control item through the network, finally realizing a self-adaptive fast nonsingular terminal sliding mode control law, and performing stable proving. According to the invention, static-error-free tracking can be realized rapidly and a low power grid current distortion rate can be achieved.

Description

technical field [0001] The invention relates to an adaptive sliding mode control of an active power filter based on disturbance observation, and belongs to the technical field of intelligent control. Background technique [0002] Since most of the energy sources in production and life are grid systems, it is necessary to ensure the safe operation of grid systems. In the actual power grid system, the power grid is often affected by the load side of the user, that is to say, if there are a large number of nonlinear devices on the load side, it will inevitably generate harmonic current, and once the harmonic current is incorporated into the power grid, it will Harms such as resonance, circuit loss, affecting the communication quality of nearby equipment, etc., even endanger the normal operation of the power grid system in severe cases. At present, the most economical way of harmonic compensation is to perform harmonic compensation at the grid-connected point on the user side. ...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01H02J2203/20Y02E40/20
Inventor 陈云费峻涛陈放
Owner HOHAI UNIV CHANGZHOU
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