Quarter period repeated controller for converter

Abstract

The invention discloses a quarter period repeated controller for a converter. In an existing repeated control technology, periodical external drive signals can be completely tracked or inhibited, and the front whole period of control and output signals can be stored. The controller comprises a given element, a periodical feedback element, and a signal transformation module and subtraction / addition element. A periodically symmetric reference signal is generated in the given element; the periodic feedback element is constructed; the signal conversion module is constructed according to the law of attraction, and the output signal of the signal conversion module is used for the allowance of the repeated controller; and the output signal of the repeated controller is served as the input of a controlled object. Specific controller parameter setting can be performed according to the index of the convergence performance of a representation system, and a monotone decreasing area, an absolute attraction layer and a steady state error boundary in the convergence process of representing tracking error can be provided. The quarter period repeated controller is capable of effectively restraining the symmetry signal interference, improving the control precision and greatly reducing memory usage.

Description

technical field [0001] The invention belongs to the technical field of repetitive control, in particular to a quarter-cycle repetitive controller for inverters. Background technique [0002] Repeated control is a control method based on the internal model principle. The essence of the internal model principle is to implant the dynamic model of the external signal of the system (that is, the internal model) into the control system to form a high-precision feedback control system, so that the system can follow the input signal without static error. To design a repetitive controller according to the principle of internal model, it is necessary to put the generation polynomial of the periodic signal into the closed-loop system to form a periodic delay feedback link. Regardless of the waveform of the input signal, as long as it repeats in the fundamental cycle, the output of the controller will accumulate the input signal cycle by cycle to completely suppress the periodic interf...

AI Technical Summary

Problems solved by technology

[0012] In order to overcome the shortcomings of existing full-cycle repetitive controllers and half-cycle repetitive controllers that cannot effectively process more complex symmetrical signals and consume a large amount of memory, the present invention provides a quarter-cycle controller for inverters. Duplicate controllers for efficient processing of more complex symmetric signals, significantly reducing memory footprint

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