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An Open-Loop Fundamental and Harmonic Phasor Estimator for Single-Phase Voltage Signals
IEEE Transactions on Industrial Informatics ( IF 12.3 ) Pub Date : 2019-10-30 , DOI: 10.1109/tii.2019.2950404
Motakatla Venkateswara Reddy , Ranjana Sodhi

This article proposes a novel technique for fundamental and selective harmonic phasor estimation of a single-phase voltage signal based on open-loop voltage signal processing approach, under adverse distorted conditions. At heart, a modified fast discrete Stockwell transform (FDST) is used for the phasor estimation. The performance of the FDST is improved by incorporating a new frequency-dependent Gaussian window for capturing the time-localized variations of individual frequency component. The modified window has four parameters, which are selected based on the statistical properties of the given input voltage signal. Furthermore, under off-nominal frequency conditions the spectral leakage problem, faced by the S-transform, is avoided by proposing a modified sample value adjustment based preprocessing stage. Various static and dynamic tests were considered according to the IEEE Standard 1159, IEEE Standard C37.118.1a-2014, and EN-50160 standards under harmonics and interharmonics scenarios. The performance of the proposed method is validated using synthetic voltage signals, simulated voltage signals on 6-bus microgrid model developed in power system computer aided design (PSCAD), and hardware implementation on dSPACE 1103. The rigorous test cases reveal that the proposed phasor measurement unit has a good adaptability to grid frequency drifts, a good harmonic and dc-offset rejection capability, and a very good steady state as well as dynamic response.

中文翻译:

单相电压信号的开环基本和谐波相量估计器

本文提出了一种在逆向失真条件下基于开环电压信号处理方法的单相电压信号基波和选择性谐波相量估计的新技术。从本质上讲,改进的快速离散斯托克韦尔变换(FDST)用于相量估计。FDST的性能通过合并一个新的依赖于频率的高斯窗口来捕获单个频率分量的时间局部变化而得以改善。修改后的窗口具有四个参数,这些参数是基于给定输入电压信号的统计属性进行选择的。此外,在偏离标称频率的条件下,通过提出基于修改的样本值调整的预处理阶段,可以避免S变换所面临的频谱泄漏问题。根据IEEE标准1159,IEEE标准C37.118.1a-2014和EN-50160标准,在谐波和间谐波情况下考虑了各种静态和动态测试。使用合成电压信号,在电力系统计算机辅助设计(PSCAD)中开发的6总线微电网模型上的模拟电压信号以及在dSPACE 1103上的硬件实现,验证了该方法的性能。严格的测试案例表明,所提出的相量测量该单元对电网频率漂移具有良好的适应性,具有出色的谐波和直流偏移抑制能力,以及非常好的稳态和动态响应。
更新日期:2020-04-22
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