A current control method with impedance estimator for single-phase PWM rectifier

2012 Third International Conference on Intelligent Control and Information Processing Pub Date : 2012-07-15 DOI:10.1109/ICICIP.2012.6391416

Weihang Yan, Heng Du, Shijie Yan

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引用次数: 2

Abstract

Current control is one of the simplest methods due to the current waveform is tracks the voltage waveform rapidly in AC side for single-phase PWM rectifier. If the voltage is not a normal sinusoidal signal, the current waveform will be distorted, so the power factor is not controlled and the current with harmonics will contaminate power supply. A current control method based on impedance estimation is proposed to solve the problem. In this new method, voltage with harmonics is decomposed into Fourier series. Their fundamental component is extracted in order to be tracked and controlled. What's more, an impedance estimator calculating resistor and reactor in controller is used to compensate the error voltage, which is generated by harmonics, the measurement of time delay and parameters variation. So the system not only realizes high power factor, sinusoidal current and stable DC link voltage, but also meet the application demand of the capability of power regeneration to the power supply. The results of experiment show that the proposed method is effective and practicable.

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基于阻抗估计的单相PWM整流器电流控制方法

电流控制是单相PWM整流器最简单的控制方法之一，因为电流波形可以快速跟踪交流侧的电压波形。如果电压不是正弦波信号，电流波形就会失真，使功率因数得不到控制，带有谐波的电流就会污染电源。针对这一问题，提出了一种基于阻抗估计的电流控制方法。该方法将含谐波的电压分解成傅里叶级数。提取它们的基本成分是为了跟踪和控制。此外，在控制器中采用计算电阻和电抗器的阻抗估计器对谐波、时延测量和参数变化产生的误差电压进行补偿。该系统不仅实现了大功率因数高、电流平稳、直流链路电压稳定，而且满足了对电源再生能力的应用需求。实验结果表明，该方法是有效可行的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2012 Third International Conference on Intelligent Control and Information Processing

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