Fast and accurate acquisition of voltage components is the basic requirement for grid-tied inverters to realize various control under unbalanced grids. In view of this situation, a delay sampling period filter, which rapidly separates each voltage component by delaying two sampling periods in dq frame, is proposed in this article. In view of the noise interference, a delay operation period filter (DOPF) is proposed to scale the operation period and limit the noise to an acceptable range. The complete positive sequence components (PSC) extraction method based on the developed DOPF+ moving average filter (MAF) algorithm is presented, combing the advantages of DOPF and MAF for eliminating the double-frequency ac components and high-frequency noise, respectively. Finally, the feasibility and priority of the DOPF+MAF algorithm and PSC extraction method have been verified by the physical experimental results.

中文翻译：

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不平衡网格中抗噪声的快速正序分量提取方法

电压分量的快速准确采集是并网逆变器实现不平衡电网下各种控制的基本要求。针对这种情况，本文提出了一种延迟采样周期滤波器，它通过在 dq 帧中延迟两个采样周期来快速分离每个电压分量。针对噪声干扰，提出了延迟操作周期滤波器（DOPF）来缩放操作周期并将噪声限制在可接受的范围内。结合DOPF和MAF在消除双频交流分量和高频噪声方面的优点，提出了基于所开发的DOPF+移动平均滤波器(MAF)算法的完全正序分量(PSC)提取方法。最后，