An Adaptive Dynamic Terminal Sliding Mode Control Method for Active Power Filters

A power filter and dynamic terminal technology, which is applied in adaptive control, general control system, control/regulation system, etc., can solve the problem of high grid current distortion rate, inability to give full play to the performance of active power filter, and low control accuracy. problem, to achieve the effect of good control accuracy, simplified control law, and reduced distortion rate

Active Publication Date: 2022-04-08
HOHAI UNIV CHANGZHOU
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Problems solved by technology

The control precision of the traditional control method is often not high, which leads to the performance of the active power filter cannot be fully utilized, and in addition
Existing controllers have high grid current distortion rate

Method used

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  • An Adaptive Dynamic Terminal Sliding Mode Control Method for Active Power Filters
  • An Adaptive Dynamic Terminal Sliding Mode Control Method for Active Power Filters
  • An Adaptive Dynamic Terminal Sliding Mode Control Method for Active Power Filters

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Embodiment Construction

[0094] figure 1 It is a schematic diagram of an adaptive dynamic terminal sliding mode control method of an active power filter according to the present invention. The schematic diagram is intended to explain: the harmonic current is detected from the load current as a reference signal r, and the dynamic terminal is constructed based on the terminal function Sliding mode surface, and then design the switching control item to ensure the stability of the system, and use the double hidden layer recurrent neural network to approximate the equivalent control item, the designed control law outputs a harmonic compensation signal x after passing through the active power filter , using negative feedback to make the error of the system tend to zero, and finally achieve the purpose of tracking the reference harmonic current quickly and without static error.

[0095] A source power filter adaptive dynamic terminal sliding mode control method of the present invention comprises the followin...

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Abstract

The invention discloses an adaptive dynamic terminal sliding mode control method of an active power filter, comprising the following steps: S1, establishing a single-phase active power filter mathematical model, defining a state variable i as x, and obtaining the second order derivative of x The expression of ; S2, define the tracking error and its first-order derivative and define the dynamic terminal sliding mode surface, get the equivalent control item, then define the switching control item, and add the equivalent control item and the switching control item to get the dynamic terminal sliding mode modulo controller; S3, using a double-hidden-layer recurrent neural network to approximate the equivalent control term. The invention provides an active power filter self-adaptive dynamic terminal sliding mode control method, which can quickly realize static-deviation-free tracking and achieve a lower power grid current distortion rate.

Description

technical field [0001] The invention relates to an adaptive dynamic terminal sliding mode control method of an active power filter, and belongs to the technical field of intelligent control. Background technique [0002] Harmonic current suppression technology has become a research hotspot in recent years. At present, the main harmonic suppression technologies include passive filters and active filters; passive filters are usually composed of inductors and capacitors, which are suitable for filtering out low-order harmonics , and can only filter out harmonics of specific harmonics, but because of its simple structure and low manufacturing cost, it is widely used in industrial fields, but the compensation accuracy of passive filters is not high, and will eventually be replaced by active power filters . Active power filter is a new type of harmonic compensation device. It is an active compensation device. In addition to compensating harmonics, it can also perform reactive pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04H02J3/00
CPCG05B13/042H02J3/01
Inventor 陈云费峻涛陈放
Owner HOHAI UNIV CHANGZHOU
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