Decoupling and delay compensation method of complex vector pi controller for grid-connected converter

A delay compensation and controller technology, applied in the direction of irreversible DC power input conversion to AC power output, output power conversion device, electrical components, etc., can solve the problems affecting the current loop control performance, feedback decoupling effect, feedback Inaccurate decoupling items and other issues, to achieve the effect of broadening the scope of use and increasing the phase angle margin
CN107395040BActive Publication Date: 2020-03-31SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHEAST UNIV
Publication Date
2020-03-31

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Abstract

The invention discloses a complex vector PI controller decoupling and delay compensation method of a grid-connected converter. Based on the vector model of the controlled object, the zero point of the controller is directly set at the pole of the controlled object to obtain Complex coefficient current controller model; for the one-shot delay of digital control and the inherent zero-order hold characteristic of the converter, the system delay transfer function is calculated, and the current loop is realized by connecting the delay compensation item in series after the complex vector PI controller delay compensation. The invention provides a simple and effective method for the current loop design of the grid-connected converter, suppresses the current coupling problem of d and q axes of the current loop to the greatest extent, increases the phase angle margin of the system through delay compensation, and improves the current Ring stability and improved dynamic response performance.
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Description

technical field

[0001] The invention belongs to the technical field of converter current control, in particular to a method for decoupling and delay compensation of a complex vector PI controller of a grid-connected converter. Background technique

[0002] With the increasingly serious problems of energy shortage and environmental pollution, the development and utilization of new energy sources such as solar and wind energy are accelerating, and new distributed power generation technologies have attracted more and more attention. In the distributed grid-connected power generation system, most of the electric energy generated by the energy conversion device must be converted into alternating current with the same frequency and phase as the grid voltage through the grid-connected converter before it can be fed into the grid. The grid-connected converter plays an essential interface between the new energy power generation device and the grid, and becomes an important part of th...

Claims

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