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Discrete repetitive control method for inverter

A technology of repetitive control and repetitive controller, applied in general control systems, adaptive control, control/regulation systems, etc., can solve problems such as reducing the convergence speed and robustness of the system, chattering problems, and non-periodic interference signal suppression.

Active Publication Date: 2019-11-15
TAIZHOU UNIV
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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 saturation function, hyperbolic tangent function, and unit vector continuous function instead of symbolic function, but this processing will reduce the convergence speed and robustness of the system. Rod

Method used

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  • Discrete repetitive control method for inverter
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  • Discrete repetitive control method for inverter

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Embodiment

[0123] Closed-loop control is performed on the inverter output waveform. Such as Figure 5 As shown, the inverter system used is composed of a given sinusoidal signal part, a repetitive controller, a PWM modulation part, an inverter main control circuit and a sampling circuit. The given sinusoidal signal, repetitive controller and PWM modulation module are all realized by DSP control board, and the rest are realized by inverter hardware circuit. The entire inverter control system is given the expected signal that needs to be output by DSP, and after PWM modulation, it drives the high and low pulse signals of the power switch tube of the inverter to realize on and off. The output signal of the inverter is restored to a sinusoidal signal through the LC filter, and the signal data such as the required voltage and current are sampled by the voltage sensor and the current sensor and returned to the DSP, and then the input signal is corrected after repeating the action of the contr...

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Abstract

The invention discloses a discrete repetitive control method for an inverter. An equivalent interference second-order differential compensation technology is adopted to construct a law of attraction with an interference suppression effect; and an e / v signal conversion module is constructed according to the law of attraction, and an output signal of the e / v signal conversion module is used for a correction of a repetitive controller. The specific controller parameter setting can be carried out according to specific expressions for an absolute attraction layer, a steady-state error band and themaximum step number required for a tracking error to enter the steady-state error band for the first time in a convergence process of a representation system. The discrete repetitive controller is capable of completely eliminating the homogeneous harmonics and the even harmonics, effectively inhibiting fractional harmonics and improving the control precision.

Description

technical field [0001] The invention relates to a discrete repetitive control method for inverters, which is suitable for inverter power supplies 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 the control system is...

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Application Information

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IPC IPC(8): G05B13/04H02M7/5387
CPCG05B13/042H02M7/5387
Inventor 林志明邬玲伟陈光梅盼朱莺莺
Owner TAIZHOU UNIV
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