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Method for controlling active power filter based on model reference self-adaptive fuzzy control

A power filter, self-adaptive fuzzy technology, applied in active power filtering, AC network to reduce harmonics/ripples and other directions, can solve the limitation of the rapid development of active power filtering technology, the actual system can not play the optimal control performance and other problems to achieve the effect of stable control system

Inactive Publication Date: 2014-05-07
HOHAI UNIV CHANGZHOU
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Problems solved by technology

[0004] The new intelligent control method has been greatly developed, but most of the control methods need to approximate the mathematical model of the active filter when applied to the active filter system, but such a control scheme will include the influence of modeling errors , the controller designed in this way can not exert the optimal control performance for the actual system, thus limiting the rapid development of active power filter technology

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  • Method for controlling active power filter based on model reference self-adaptive fuzzy control

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[0133] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0134] see figure 1 and figure 2, an active power filter current control method based on model reference adaptive fuzzy control, by combining the advantages of fuzzy approximation, fuzzy control and adaptive control, it can greatly improve the compensation performance and system The robust performance to achieve fast and highly adaptable control objectives is conducive to the rapid promotion of active power filters. Specifically include the following steps,

[0135] The first step is to establish a dynamic model of the active power filter

[0136] 1) Decompose the working process of the single-phase shunt active power filter into two modes within one switching cycle, and set the switching frequency of the four switching tubes VT1-VT4 as f s ,...

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Abstract

The invention discloses a method for controlling an active power filter based on model reference self-adaptive fuzzy control. The method comprises the steps that (1) a dynamic model of the active power filter is established; (2) a reference model is selected and a state space model of the reference model is shown as the formula (14); (3) a generalized state tracking error of the active power filter is defined as that e=xm-x (15); (4) T-S fuzzy approaching output of a non-linear portion of the active power filter is designed; (5) a current self-adaptive controller, composed of a T-S fuzzy control item and a sliding mode control item, of the active power filter is designed; (6) a system is proved to be stable through the stability theory and it is guaranteed that the tracking error e converges at zone; (7) a PI controller is used for controlling voltage across the direct current side of the active power filter. According to the method, the compensation performance and the robustness of the active power filter can be greatly improved, the power quality is effectively improved, and the method is beneficial to rapid popularization of the active power filter.

Description

technical field [0001] The invention relates to an active power filter control method based on model reference self-adaptive fuzzy control, and belongs to the technical field of active power filter. Background technique [0002] The high-frequency development and wide application of power electronic technology is an inevitable trend. It can bring more and more convenience to our production and life. On the contrary, the power quality problems caused by the nonlinear characteristics of power electronic devices will be more severe. , the characteristics of harmonics will be more complicated. As an effective device for compensating harmonics and reactive power, the active power filter can offset the harmonic current generated by the nonlinear load by injecting a compensation current with the same amplitude and opposite phase as the harmonic current into the power grid, which can effectively overcome the The traditional passive filter compensates essential problems such as sing...

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/20
Inventor 马凯琪费峻涛
Owner HOHAI UNIV CHANGZHOU
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