As a side effect caused by new technologies, supraharmonics attracted the attention of researchers in recent years. Mitigation and analysis of supraharmonics distortions are of great importance to guarantee the power quality (PQ) available in the power grids since such distortions can cause serious damage to the grid-connected equipment. However, there are few works in literature reporting techniques for supraharmonics analysis, and PQ equipment is rarely capable of performing measurements in the supraharmonic range. This work proposes a supraharmonic estimation system utilizing a digital filter bank through a multirate digital signal processing technique. The polyphase decomposition applied in the decimating filter bank enables the simplification of the system implementation. Both synthetic and real signals are used to evaluate the technique in analyzing supraharmonic distortions. The proposed method shows a good application prospect in accurately measuring supraharmonics and with a significant reduction in computational complexity compared with the method presented in the IEC 61000-4-30 standard.

作为新技术带来的副作用，超谐波技术近年来引起了研究人员的关注。超谐波失真的缓解和分析对于确保电网中可用的电能质量（PQ）至关重要，因为这种失真会严重影响并网设备。但是，在文献报告技术中，用于超谐波分析的工作很少，并且PQ设备很少能够在超谐波范围内执行测量。这项工作提出了一种通过多速率数字信号处理技术利用数字滤波器组的超谐波估计系统。抽取滤波器组中应用的多相分解可以简化系统实现。合成信号和实际信号均用于评估超谐波失真分析中的技术。与IEC 61000-4-30标准中提出的方法相比，该方法在准确测量超谐波方面显示出良好的应用前景，并且显着降低了计算复杂度。