Fractional order terminal sliding mode-based AFNN control method of active power filter

Abstract

The invention discloses a fractional order terminal sliding mode-based AFNN control method of an active power filter. The method comprises the steps of designing a mathematical model of an active filter, a fractional order-based nonsingular terminal sliding mode controller and a fractional order-based adaptive fuzzy neural network controller; and controlling the active power filter by using output of a fractional order-based nonsingular terminal sliding mode adaptive fuzzy neural network controller. According to the AFNN control method, the disadvantage that a nonsingular inversion terminal sliding mode control strategy needs accurate system information is overcome and the robustness is improved; good performance can still be kept when an external load changes; operation of the active power filter along a sliding mode track is ensured through designing the sliding mode controller; for the disadvantages of an inversion control law, an AFNN controller is adopted to approach a nonlinear part in the active power filter. A fractional order module is introduced into the sliding mode controller and the adaptive controller, so that an adjustable item is added by a fractional order in comparison with an integer order, and the overall performance of a system is improved.

Description

technical field [0001] The invention relates to the technical field of adaptive fuzzy control of an active power filter, in particular to an AFNN control method of an active power filter based on a fractional-order terminal sliding mode. Background technique [0002] The development of power electronic technology has brought various conveniences to our life. However, with the addition of more and more power electronic equipment loads in the grid, due to the nonlinear load applied by the sinusoidal voltage, the fundamental current is distorted into Harmonic current, resulting in a large number of power quality problems. [0003] Capacitors that can compensate reactive power are widely used in the power grid. At a certain frequency, the series or parallel resonance conditions may be met, but when the harmonic is large enough, it will cause dangerous overvoltage or overcurrent, which often leads to Damage to electrical components and equipment seriously affects the safe operat...

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Problems solved by technology

[0005] However, when using mathematical model simulation, because the object in the active power filter control is a complex nonlinear system, it is difficult to obtain an accurate mathematical model of the controlled object, so the traditional control scheme is difficult to achieve the ideal control effect

So far, it has not mentioned how to build an accurate mathematical model of the controlled object, so it has certain research and application value

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