LCLCL type active power filter control method based on repeated sliding-mode control

Abstract

The invention relates to an LCLCL type active power filter control method based on repeated sliding-mode control, and belongs to the field of an active power wave filter control. A slide mode switching function is built by a linear combination of three error variables of the current error, wave filtering capacitance voltage error and grid-connected harmonic current error output by an inverter; thesliding mode control effect is solved through index reaching law; by aiming at the sliding mode surface drift problem due to system modeling incompleteness and system parameter uncertainty, the repeated control is used for replacing multi-proportional resonance control to be added into a sliding mode surface; the harmonic current error item x3a is compensated; a repeated sliding mode composite control strategy is provided; the whole harmonic compensation is realized; the steady state error is further reduced; the frequency adaptivity is enhanced.

Description

technical field [0001] The invention belongs to the field of active power filter control, in particular to an LCLCL type active power filter control method based on repeated sliding mode control. Background technique [0002] Sliding mode control is a variable structure control, the essence of which is that in the vicinity of the prescribed sliding manifold (sliding mode surface), the controlled state motion trajectory vector always points to the sliding manifold, and this movement is imposed by the switch control strategy The discontinuous control action is guided to achieve, and finally the trajectory of the controlled object tends to the desired equilibrium point. During the sliding mode switching process, the system trajectory is only affected by the sliding mode surface, and has nothing to do with the control object parameters and disturbances, so the dynamic response of the system is fast and the robustness is strong [39]. The ideal sliding mode control method require...

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Problems solved by technology

[0004] Aiming at the adverse effect of the impedance change of the mine power grid on the robustness of the traditional feed-forward repetitive control system, the present invention proposes a control method for the LCLCL active power filter based on the repetitive sliding mode control, which solves the problem that the LCLCL filter is transmitted by the controlled object. Robustness issues when functions change

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