Inverter repetitive control method based on attraction law

Abstract

The invention discloses an inverter repetitive control method based on the attraction law. The method includes the steps of substituting an equivalent interference second order difference compensationterm into an arc tangent attraction law, establishing an e / v signal conversion module according to the arc tangent attraction law, using output signals of the e / v signal conversion module as the modification amount of a repetitive controller, and then calculating output signals of the repetitive controller as the input of an inverter object so that an inverter system can change along with reference signals. The parameters of the controller can be specifically set according to an absolute attraction layer, a steady-state error belt and the index of the maximum number of steps required when tracking errors enter the steady-state error belt for the first time. The discrete repetitive controller which is designed according to the time domain, has high control precision, completely restrains homogeneous harmonic and even harmonic interference signals, effectively restrains fractional integral harmonic waves and is based on the arc tangent attraction law is provided.

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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