Adaptive Fuzzy Sliding Mode Control Method for Active Power Filter Based on Fractional Order

Abstract

The invention discloses a fractional order-based adaptive fuzzy sliding-mode control method for an active power filter. The method specifically comprises the following steps: (1) building a mathematic model of the active power filter as shown in the specification; and (2) designing a fractional order-based adaptive fuzzy sliding-mode controller as shown in the specification. The fractional order-based adaptive fuzzy sliding-mode control method can ensure real-time tracking on a harmonic current, strengthens the dynamic performance of a system, improves the robustness of the system and can still keep good performance 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; the fractional order-based adaptive fuzzy sliding-mode controller is designed for approaching the nonlinear part in the active power filter; real-time tracking on an instructional current can be ensured and the robustness of the system can be strengthened by designing an adaptive fuzzy controller; a fractional order module is introduced to the sliding-mode controller and the adaptive controller; and compared with an integral order, a tunable item is added, so that the overall performance of the system is improved.

Description

technical field [0001] The invention relates to an adaptive fuzzy sliding mode control method of an active power filter, in particular to an application of a fractional order-based adaptive fuzzy sliding mode control method to a three-phase parallel voltage type active power filter. Background technique [0002] Capacitors for compensating reactive power are widely used in the power grid. At a certain frequency, it may meet the condition of series or parallel resonance. When the harmonic is large enough, it will cause dangerous overvoltage or overcurrent, which often leads to electrical components and Equipment damage seriously affects the safe operation of the power system. In addition, the flow of harmonic currents in the grid will cause active power loss on the line. The additional line loss caused by the skin effect of the wire is relatively large; severe harmonic distortion reduces the breaking capacity of the circuit breaker and may damage the circuit breaker. In civi...

AI Technical Summary

Problems solved by technology

Compared with the extensive use of APF in foreign countries, my country's active filter technology is still in the research and test stage, and only a few prototypes are put into operation in industrial applications, which is not suitable for the increasingly serious harmonic pollution in my country.

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