Active filter current control method insensitive to load current components

Abstract

The invention provides an active filter current control method insensitive to load current components, and belongs to the technical field of filters. The invention aims to solve the problem that an existing active filter may contain some compensation capacitor current in output current through detection and calculation, so that the phenomenon of inaccuracy and unstable control of the active filtercan be caused. The method is characterized in that an inner ring of a series-parallel converter adopts a passive controller to design and track current, and a port controlled dissipation hamilton PCHD model is established, an inner ring passive controller is designed by adopting a virtual damping injection method; a transition process is arranged by a tracking differentiator by the outer ring according to the system bearing capacity, so that the system overshoot is reduced, the nonlinear function is adopted for performing nonlinear combination on the error, and the control precision is improved. The result shows that the dynamic static property is excellent, the robustness is relatively strong, the feasibility of the adopted mixed passive control is verified, and a new idea is provided for the control strategy.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to an active filter current control method insensitive to load current components. Background technique [0002] The new generation of distribution network is characterized by the close integration of distributed power sources and loads. Therefore, power quality problems such as harmonics generated by nonlinear loads will have a huge impact on distributed energy sources, and attention must be paid to the governance of harmonics. Although the passive filter is a filtering method with a simple structure, its filtering effect is limited, it is easy to have series and parallel resonance with the power grid, and its volume is huge, so it is not suitable for application in low-voltage applications. As a new type of harmonic control tool, active filters are widely used in the field of harmonic control as a substitute for passive filters. [0003] In order to improve the compensation effec...

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Problems solved by technology

[0005] In order to solve the technical problems existing in the prior art: the existing active filter cannot directly detect the current of the nonlinear load, and can only calculate the load current through the grid current and the output current of the active filter, which leads to the detection of The load current contains the current of some compensation capacitors, which will lead to unstable control of the active filter

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