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Back-stepping sliding-mode adaptive fuzzy control method of active power filter

A power filter and sliding mode self-adaptive technology, applied in active power filter, electrical components, circuit devices, etc., can solve the problems that the control scheme is difficult to achieve the control effect, and it is difficult to obtain the mathematical model of the controlled object. Deterministic, good effect, strong robust effect

Inactive Publication Date: 2016-11-09
HOHAI UNIV CHANGZHOU
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Problems solved by technology

[0003] Because it is difficult to obtain the precise mathematical model of the controlled object, it is difficult for the traditional control scheme to achieve the ideal control effect

Method used

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  • Back-stepping sliding-mode adaptive fuzzy control method of active power filter
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  • Back-stepping sliding-mode adaptive fuzzy control method of active power filter

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Embodiment Construction

[0050] The following is further described with reference to the drawings and specific embodiments.

[0051] 1. Establish the mathematical model of active power filter

[0052] The present invention studies a relatively widely used parallel voltage type active power filter. In practical applications, the application of three-phase alternating current accounts for the majority, so it is mainly used in the case of three-phase three-wire system, and the main circuit structure refers to figure 1 .

[0053] Active power filter is mainly composed of three parts, namely harmonic current detection module, current tracking control module and compensation current generation module. The harmonic current detection module usually adopts the fast detection of harmonic current based on instantaneous reactive power theory. The compensation current usually takes place using PWM control. The compensation current should be the same phase and opposite to the amplitude of the detected harmonic current...

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Abstract

The invention discloses a back-stepping sliding-mode adaptive fuzzy control method of an active power filter. The method comprises the steps of (1) building a mathematic model of the active power filter; and (2) designing a fractional order-based back-stepping sliding-mode adaptive fuzzy controller. By the back-stepping sliding-mode adaptive fuzzy control method of the active power filter, real-time tracking of harmonic current can be ensured; the dynamic property of a system is strengthened; the robustness of the system is improved; and good property can still be kept when an external load changes. The condition that the active power filter runs along a sliding-mode track is ensured through designing a sliding-mode variable controller; aiming at the defects of the back-stepping control law, the fuzzy controller is adopted to approach a nonlinear part in the active power filter; real-time tracking of instruction current and strengthening of the robustness of the system can be ensured through designing the adaptive fuzzy controller; fractional order modules are introduced into the sliding-mode controller and the adaptive controller; and compared with an integer order, the fractional order has the advantage that a tunable item is added, so that the overall performance of the system is improved.

Description

Technical field [0001] The invention relates to the technical field of active power filter adaptive fuzzy control, in particular to a fractional-order three-phase parallel voltage type active power filter inversion sliding mode adaptive fuzzy control method. Background technique [0002] The development of power electronic technology has brought various conveniences to our lives. However, as more and more power electronic equipment loads are added to the power grid, the fundamental wave current is distorted into a nonlinear load due to sinusoidal voltage. Harmonic currents have caused a lot of power quality problems, which have been bothering us. Nowadays, capacitors capable of compensating reactive power are widely used in the power grid. At a certain frequency, it may meet the conditions of series or parallel resonance. However, when the sub-harmonic is large enough, it will cause dangerous overvoltage or overcurrent, which often leads to The damage of electrical components an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH02J3/00H02J3/01H02J2203/20Y02E40/20
Inventor 曹頔雷单单王腾腾费峻涛
Owner HOHAI UNIV CHANGZHOU
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