Active power filter self-adaptive fuzzy control system and method

Abstract

The invention discloses an active power filter self-adaptive fuzzy control system and an active power filter self-adaptive fuzzy control method. The active power filter self-adaptive fuzzy control system comprises an active power filter and a self-adaptive controller which is used for controlling the active power filter to work. The self-adaptive controller is designed according to a mathematical model of the active power filter, and by adoption of a self-adaptive fuzzy algorithm for designing controller parameters on the basis of a fuzzy theory and a Lyapunov method, the self-adaptive controller is updated automatically on line and can update the parameters in real time to ensure that tracking errors are converged to zero and the robustness of the system to parameter changes is improved; and a monitoring controller is added to ensure the boundedness and the global stability of the parameters.

Description

technical field [0001] The invention relates to an adaptive control system in a power system, in particular to an adaptive fuzzy control system of an active power filter and a method thereof. Background technique [0002] With the increase of nonlinear loads in the power system, the power quality of the power grid is getting worse and worse, and the harmonic content is also greatly increased. Harmonics not only affect the normal operation of electrical equipment, but also have a great impact on the work of communication equipment. The active power filter is an effective device for compensating harmonics and reactive power. The active power filter can offset the harmonic current generated by the load by injecting a certain compensation current into the grid. It has high controllability and Rapid response, because it is difficult to obtain an accurate digital model of the controlled object, it is difficult for the traditional control scheme to achieve the ideal control effect....

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Problems solved by technology

[0002] With the increase of nonlinear loads in the power system, the power quality of the power grid is getting worse and worse, and the harmonic content is also greatly increased. Harmonics not only affect the normal operation of electrical equipment, but also have a great impact on the work of communication equipment. The active power filter is an effective device for compensating harmonics and reactive power. The active power filter can offset the harmonic current generated by the load by injecting a certain compensation current into the grid. It has high controllability and Rapid response, because it is difficult to obtain an accurate digital model of the controlled object, it is difficult for the traditional control scheme to achieve the ideal control effect

[0003] It can be seen that the above-mentioned existing active power filter control scheme obviously still has inconvenience and defects in use, and needs to be further improved urgently.

In order to solve the problems existing in the control scheme of the active power filter, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and there is no suitable solution for the general control system. To solve the above problems, this is obviously a problem that the relevant industry is eager to solve

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