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Intelligent current tracking control method of active filter based on t‑s fuzzy modeling

A technology of source filter and current tracking, which is applied to networks using active components, electrical components, impedance networks, etc., and can solve problems such as current tracking control without active power filters

Inactive Publication Date: 2017-08-15
HOHAI UNIV CHANGZHOU
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Problems solved by technology

However, so far, although the existing patents have studied the control of active power filters from different aspects, they have not applied the T-S fuzzy model and Lyapunov theory to the current tracking control and dynamic control of active power filters. compensate

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  • Intelligent current tracking control method of active filter based on t‑s fuzzy modeling
  • Intelligent current tracking control method of active filter based on t‑s fuzzy modeling
  • Intelligent current tracking control method of active filter based on t‑s fuzzy modeling

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Embodiment Construction

[0085] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0086] The principle block diagram of the inventive method is as figure 2 shown.

[0087] 1. Overview of active power filter

[0088] The invention mainly studies the parallel voltage type active power filter, which is used to eliminate the harmonic pollution caused by the three-phase diode bridge rectification load. Its main circuit structure is as figure 1 .

[0089] The basic working principle of the active power filter is to generate a compensation current that is equal in size and opposite in direction to the harmonic component of the load current in real time by detecting the harmonic component in the load current in real time. wave components.

[0090] According to the circuit theory and Kirchhoff's theorem, the mathematical model of the active filter in the abc coordinate system is as follows:

[0091]

[0092] Among them, v ...

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Abstract

The invention discloses an intelligent current tracking control method used for an active filter and based on T-S fuzzy modeling and relates to current control methods used for active power filters. The method comprises the steps that a T-S model of the active filter is established on the basis of a nonlinear model of the active filter and is composed of three control rules, and a fuzzy dynamic system model of the active filter is obtained by means of single-point fuzzification, product inference and center equal weighed defuzzification; a reference model is designed according to an expected dynamic response; a partial linear state feedback controller is designed for each T-S fuzzy submodel based on a parallel distributed compensation method, so that the trajectory of the fuzzy dynamic system model of the active filter tracks the trajectory of the reference model; because of uncertainty of parameters and existence of external interference, parameters of the T-S fuzzy model of the active filter are unknown, and a parameter estimator is designed; moreover, an improved self-adaptive control algorithm is designed based on the Lyapunov theory, so that global asymptotic stability of current control errors and parameter estimated errors is achieved.

Description

technical field [0001] The invention belongs to the active power filter technology, in particular to an active filter intelligent current tracking control method based on T-S fuzzy modeling. Background technique [0002] With the popularization and application of modern power electronic technology, there are more and more various power electronic devices. The working performance and service life of equipment and electrical equipment, and even endanger the safety of the power system. Currently, external filters are mainly used for treatment. Filters are divided into two types: passive filters and active filters (APF). Since the passive filter can only compensate specific harmonics and other defects, the current research on the control of electric energy problems mainly focuses on the active filter. The active filter can track and compensate the harmonics with changing frequency and amplitude. It can not only compensate each harmonic, but also suppress flicker and compensate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H21/00H03H11/00
Inventor 侯世玺费峻涛
Owner HOHAI UNIV CHANGZHOU
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