Improved voltage harmonic control for sensorless shunt active power filters

E. Lavopa, P. Zanchetta, M. Sumner, P. Bolognesi
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引用次数: 4

Abstract

A new control method for active filters based only on voltage detection at the Point of Common Coupling (PCC) is proposed. This technique allows using the active filter as a plug-and-play sensorless device, as it is possible to compensate the harmonics produced by the distorting loads just by measuring the PCC voltage, without needing to measure the distorting load current, and just with an approximate knowledge of the grid characteristics. A harmonic extraction structure is designed to calculate the active filter compensating current in the reference frames rotating at different harmonic frequencies. All the harmonic frames are decoupled so to avoid interactions between the control loops. A real-time implementation of Discrete Fourier Transform is utilized for accurate estimation of the fundamental phase and the harmonics amplitudes and phases. No low-pass or band-pass filters are needed for the harmonic identification.
改进无传感器并联有源电力滤波器的电压谐波控制
提出了一种新的基于共耦合点电压检测的有源滤波器控制方法。这种技术允许使用有源滤波器作为即插即用的无传感器设备,因为可以通过测量PCC电压来补偿由扭曲负载产生的谐波,而不需要测量扭曲负载电流,只需要对电网特性有大致的了解。设计了一种谐波提取结构,用于计算以不同谐波频率旋转的参照系中的有源滤波器补偿电流。所有的谐波框架都被解耦,以避免控制回路之间的相互作用。利用离散傅里叶变换的实时实现来精确估计基本相位和谐波幅值和相位。谐波识别不需要低通或带通滤波器。
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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