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Sliding-mode control method for fuzzy PI parameter self-turning feedback linearization of active filter

A technology of feedback linearization and parameter self-tuning, applied to harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., can solve problems such as difficult control methods

Inactive Publication Date: 2013-09-18
HOHAI UNIV CHANGZHOU
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Problems solved by technology

Due to the nonlinear characteristics of the active filter model, control methods such as intelligent control and adaptive control are difficult to apply

Method used

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  • Sliding-mode control method for fuzzy PI parameter self-turning feedback linearization of active filter
  • Sliding-mode control method for fuzzy PI parameter self-turning feedback linearization of active filter
  • Sliding-mode control method for fuzzy PI parameter self-turning feedback linearization of active filter

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Embodiment Construction

[0055] Below in conjunction with accompanying drawing and specific embodiment, the present invention will be further described:

[0056] A fuzzy PI parameter self-tuning feedback linearization sliding mode control method for parallel active filters, such as figure 1 shown, including the following steps

[0057] 1) Detect load current, compensation current and parallel active filter access point voltage;

[0058] Let the three-phase symmetrical supply voltage source be (V Sp cos(wt), V Sp cos(wt-2π / 3), V Sp cos(wt-4π / 3)), compensation circuit resistance R c for R c =(R ca , R cb , R cc ), compensation circuit inductance L c for L c =(L ca , L cb , L cc ), the DC capacitance is C dc , supply current I S for I S =(I Sa , I Sb , I Sc ), load current I L for I L =(I La , I Lb , I Lc ), compensation current I c for I c =(I ca , I cb , I cc ), the active filter access point voltage V con for V con =(V cona ,V conb ,V conc ), the DC side voltage is V ...

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Abstract

The invention discloses a sliding-mode control method for fuzzy PI parameter self-turning feedback linearization of an active filter. By a fuzzy PI parameter self-turning feedback linearization method, according to actual error in voltage control of the direct-current side of the active filter, fuzzy reasoning is performed according to a preset fuzzy rule so as to realize self-adaptive regulation of feedback linearization control law parameters, and accordingly, stability and adaptability of the voltage of the direct-current side are improved effectively. An integral position tracking sliding-mode controller is capable of effectively reducing harmonic content of supply current after compensation and improving harmonic compensation effect of the active filter. Further, since a synchronous coordinate transformation based unit sinusoidal-signal computing method is utilized, unit synchronous sinusoidal-signals can be computed accurately on the condition of high harmonics of supply voltage, and can be used for computing of reference supply current. The sliding-mode control method has the advantages that the harmonic compensation effect is good, the voltage of the direct-current side of the system has good dynamic and static characteristics, and system performance keeps good even when the power supply contains the harmonic voltage and non-linear loads change.

Description

Technical field: [0001] The patent of the invention belongs to the active power filter technology, in particular to a fuzzy PI parameter self-tuning feedback linearization sliding mode control method of the active filter. Background technique: [0002] With the development of power electronics technology, the nonlinear load in the power system has increased a lot. The use of various time-varying devices and inverters causes a large number of harmonics and sub-harmonics to flow into the grid, resulting in a decline in power quality. As an effective device for harmonic compensation, active filters are widely used in various fields of harmonic compensation. Three-phase three-wire circuit is widely used in high-voltage transmission system because of its simple structure and mature technology, and it is a typical form of multi-phase alternating current. Many non-linear loads are directly connected to the three-phase grid, causing a large amount of harmonics to be injected into ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 李天华费峻涛
Owner HOHAI UNIV CHANGZHOU
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