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Active filter auto-disturbance rejection control method based on fuzzy PI compound control

A technology of active disturbance rejection control and composite controller, which is applied in active power filtering and AC network to reduce harmonics/ripples, etc. It can solve the problem that only specific harmonics can be compensated, impedance characteristics have a great influence, and are not applicable, etc. problem, to achieve the effect of ensuring harmonic compensation, improving dynamic performance index, and simplifying design

Inactive Publication Date: 2016-02-03
HOHAI UNIV CHANGZHOU
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Problems solved by technology

The control effect of passive filters on harmonics is greatly affected by the impedance characteristics of the system, and is easily affected by changes in temperature, harmonics and nonlinear loads, and its filtering performance is unstable
In addition, passive filters can only filter out harmonics of a specific order, so they are not suitable for places with complex harmonics
There are defects such as compensation for specific harmonics, so the current treatment of power problems is mainly focused on active filters

Method used

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  • Active filter auto-disturbance rejection control method based on fuzzy PI compound control
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  • Active filter auto-disturbance rejection control method based on fuzzy PI compound control

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Embodiment Construction

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0043] figure 1 It is a schematic flow chart of an embodiment of the active filter active disturbance rejection control method based on fuzzy PI composite control provided by the present invention, as figure 1 shown, including:

[0044] S101. Establish a mathematical dynamic model of the active power filter.

[0045] Among them, according to figure 2 The equivalent circuit diagram of the active power filter establishes a mathematical dynamic model as

[0046] ...

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Abstract

The invention discloses an active filter auto-disturbance rejection control method based on fuzzy PI compound control, which comprises that a mathematic dynamic model of an active filter is established; based on the mathematic dynamic model, the fuzzy PI compound control is used to control a direct current capacitor voltage, and an active current of a main circuit of the active electric filter is input by an output power grid; according to the active current, an auto-disturbance rejection controller is used to work out a control law; and the control law is input into a PWM controller to generate a signal which controls an inverter to be switched on or switched off, a switching tube in the main circuit is controlled, and an alternating current compensation current is generated and injected into the power grid to realize current compensation and idle elimination. The active filter auto-disturbance rejection control method based on the fuzzy PI compound control disclosed by the invention can ensure real-time tracking of an instruction current by the compensation current and can effectively reduce harmonic waves.

Description

technical field [0001] The invention relates to the technical field of active power filtering, in particular to an active filter active disturbance rejection control method based on fuzzy PI composite control. Background technique [0002] With the progress and development of society, people's living standards are improving day by day, and a large number of electrical equipment is put into daily production and life, followed by a large number of harmonic and reactive power pollution in the power grid, which Seriously affect the quality of electric energy. The existence of harmonic voltage or harmonic current in the power grid will increase the additional loss of power system equipment, cause problems such as failure of measurement and automatic control instruments, affect the efficiency of equipment, and may cause fires due to overheating of lines in severe cases. [0003] At present, external harmonic compensation devices are mainly used to compensate harmonics, and filter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/20
Inventor 刘倪宣费峻涛
Owner HOHAI UNIV CHANGZHOU
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