A Method for Extracting the Fundamental-Frequency Positive-Sequence Voltage Vector Based on Simple Mathematical Transformations
A Method for Extracting the Fundamental-Frequency Positive-Sequence Voltage Vector Based on Simple Mathematical Transformations
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DOI：
10.1109/tie.2008.2009525
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发表时间：
2009-05
影响因子：
7.7
通讯作者：
H. Souza;F. Bradaschia;F. Neves;M. Cavalcanti;G. Azevedo;J. P. Arruda
中科院分区：
文献类型：
--
作者：
H. Souza;F. Bradaschia;F. Neves;M. Cavalcanti;G. Azevedo;J. P. Arruda
在本文中，提出了一种新的用于获得基本频率正序电网电压的新方案。该方法基于四个简单的数学转换。其中两个在固定参考框架中，能够从原始信号中消除奇数。其他两个转换是在同步旋转的参考框架中实现的，以消除均匀的谐波。最后一个转换块的输出是用于检测正序电压向量的频率和位置的同步参考框架相锁定环的输入。通过应用扭曲和不平衡的信号，通过模拟和实验来验证所提出的算法，其中包含正和负序列成分。结果与理论上预测的那些一致，并表明所提出的方案具有在网格连接转换器同步算法中使用的巨大潜力。
In this paper, a novel scheme for obtaining the fundamental-frequency positive-sequence grid voltage is proposed. The method is based on four simple mathematical transformations; two of them are in the stationary reference frame, which are able to eliminate odd harmonics from the original signals. The other two transformations are implemented in a synchronously rotating reference frame in order to eliminate even harmonics. The output of the last transformation block is the input to a synchronous reference-frame phase-locked loop for detecting the frequency and position of the positive-sequence voltage vector. The proposed algorithm was verified through simulations and experiments by applying distorted and unbalanced signals, containing positive and negative-sequence components. The results are in agreement with those theoretically predicted and indicate that the proposed scheme has a great potential for use in grid-connected converter synchronization algorithms.