Self-adaption fuzzy sliding control method for active filter based on fuzzy approximation

An adaptive fuzzy and source filter technology, applied in fuzzy logic-based systems, active power filtering, harmonic reduction devices, etc., to reduce chattering, improve robustness and adaptability

Inactive Publication Date: 2013-01-02
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, there is no comprehensive ap...

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  • Self-adaption fuzzy sliding control method for active filter based on fuzzy approximation
  • Self-adaption fuzzy sliding control method for active filter based on fuzzy approximation
  • Self-adaption fuzzy sliding control method for active filter based on fuzzy approximation

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Embodiment Construction

[0015] Below in conjunction with accompanying drawing, the specific implementation of the present invention will be further described:

[0016] The invention patent mainly studies the most widely used parallel voltage type active power filter. In practical applications, most of them are used for three-phase, so the main research is for the situation of three-phase three-wire system. Its main circuit structure is as figure 1 .

[0017] The basic working principle of the active power filter is to detect the voltage and current of the compensation object, and calculate the command signal i of the compensation current through the calculation circuit of the command current * c , the signal is amplified by the compensation current generation circuit to obtain the compensation current i c , the compensation current offsets the harmonics and reactive currents to be compensated in the load current, and finally obtains the desired power supply current.

[0018] According to circuit...

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Abstract

The invention discloses a self-adaption fuzzy sliding control method for an active filter based on fuzzy approximation, relates to a control system for an active power filter and particularly belongs to application of the self-adaption fuzzy sliding control method on control of the active power filter. The control system doesn't rely on an accurate model of a controlled object, is good in dynamic and static performance, has good self adaption and robustness, and can guarantee stability of the whole system. The system is mainly designed based on fuzzy control, sliding control, self adaption control and lyapunov stability theory, can improve robustness and adaption of the system to non linear load change and system parameter unmatching, and furthermore has capacity on achieving harmonic compensation under complex power grid environment. In addition, the system carries out fuzzy approximation on a switch item of a controller, and a novel self-adaption fuzzy controller is designed to effectively reduce buffeting.

Description

technical field [0001] The patent of the invention belongs to the active power filter technology, and in particular relates to an adaptive fuzzy control method of an active power filter. Background technique [0002] With the rapid development of power electronics technology, various semiconductor switching devices are widely used. While power electronics technology improves people's production and life, it also brings power quality problems. The so-called power quality problems refer to problems such as current and voltage waveform distortion, phase distortion, and low power factor caused by nonlinear loads in the power grid. It is an effective measure for harmonic suppression to adopt power filter device to absorb the harmonic generated by the harmonic source nearby. At present, parallel passive filters are mainly used in China to deal with harmonic currents in the power grid. However, since passive filters can only effectively deal with specific harmonics, people gradu...

Claims

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Application Information

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IPC IPC(8): H02J3/01G06N7/02
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 侯世玺费峻涛华民刚戴卫力
Owner HOHAI UNIV CHANGZHOU
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