A Repeated Control Method of Inverter Based on Law of Attraction

Abstract

The invention discloses an inverter repetition control method based on the law of attraction. The equivalent interference second-order difference compensation term is embedded into the arctangent attraction law; according to the arctangent attraction law, the e / v signal conversion module is constructed, and its output signal is used for the correction amount of the repetitive controller; then the output signal of the repetitive controller is calculated As an input to the inverter object, make the inverter system follow the reference signal changes. The specific controller parameter tuning can be carried out according to the absolute attraction layer, the steady-state error band and the index of the maximum number of steps required for the tracking error to enter the steady-state error band for the first time. The invention provides a discrete repetitive controller based on arctangent attraction law designed in time domain, with good control precision, completely suppressing interference signals of homogeneous harmonics and even harmonics, and effectively suppressing fractional harmonics.

Description

technical field [0001] The invention relates to a repetitive control method of an inverter based on the law of attraction, which is suitable for inverter power sources and also for periodical operation processes in industrial control. Background technique [0002] Repetitive controllers are a control technique with a "periodic learning" property. This control technique adopts the positive feedback form 1 / (1-e -Ts ) to construct an internal model of a periodic signal with a period of T, and embed it in a stable closed-loop system, the output of the internal model will accumulate the input signal cycle by cycle to form a control effect, and solve the cycle tracking of the reference signal or the suppression of the periodic interference signal question. At present, it has been widely used in motor servo system, power electronic inverter, hard disk / CD servo system and other repetitive operation processes. [0003] Computer control technology is used in actual engineering, and...

AI Technical Summary

Problems solved by technology

[0004] In practice, the inverter control technology under the periodic reference signal is used, and the system is mostly implemented in a discrete manner, which has chattering problems and cannot completely suppress the periodic interference signal

For the chattering problem caused by intermittent characteristics, the commonly used method is continuous processing, such as continuous functions such as saturation function and arctangent function instead of symbolic functions, but this processing will reduce the convergence speed and robustness of the system

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