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A recursive harmonic current detection method without fictitious orthogonal components for single-phase system
International Journal of Electrical Power & Energy Systems ( IF 5.2 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.ijepes.2020.106421
Xiongmin Tang , Cong Zou , Zipeng Huang , Miao Zhang

Abstract Detecting the harmonic currents fast and precisely in non-linear loads are very important to suppress harmonics. Among different detection methods, the detection method based on instantaneous reactive power theory is considered as one of the simplest and most attractive techniques. However, the speed and accuracy of the detection method for single-phase system are seriously affected by the fluctuation of the output of low-pass filters (LPFs) and the correctness of fictitious orthogonal components. To address these issues, the inherent relations between the output of LPFs and the harmonic currents of the loads are discussed. A recursive module is proposed to suppress the fluctuation of the output of LPFs, which is mainly caused by the two dominant harmonic currents in non-linear loads. Based on recursive modules, a recursive harmonic current detection method, which is little affected by the two dominant harmonic currents, is presented in the paper. In addition, to eliminate the effects of inaccurate orthogonal current in traditional detection methods, coordinate transformation modules without the use of fictitious orthogonal components are adopted. Simulation and experimental results show that the proposed current detection method has high detection accuracy in steady-state scenarios and fast dynamic responses under load change, voltage sag and frequency variation can be achieved with the proposed detection method.

中文翻译:

一种无虚拟正交分量的单相系统递归谐波电流检测方法

摘要 快速准确地检测非线性负载中的谐波电流对于抑制谐波非常重要。在不同的检测方法中,基于瞬时无功功率理论的检测方法被认为是最简单和最具吸引力的技术之一。然而,低通滤波器(LPF)输出的波动和虚拟正交分量的正确性严重影响了单相系统检测方法的速度和精度。为了解决这些问题,本文讨论了 LPF 输出与负载谐波电流之间的内在关系。提出了一种递归模块来抑制 LPF 输出的波动,这主要是由非线性负载中的两个主要谐波电流引起的。基于递归模块,论文提出了一种受两种主要谐波电流影响较小的递归谐波电流检测方法。此外,为了消除传统检测方法中正交电流不准确的影响,采用了不使用虚拟正交分量的坐标变换模块。仿真和实验结果表明,所提出的电流检测方法在稳态场景下具有较高的检测精度,并且可以通过所提出的检测方法实现负载变化、电压骤降和频率变化下的快速动态响应。采用不使用虚拟正交分量的坐标变换模块。仿真和实验结果表明,所提出的电流检测方法在稳态情况下具有较高的检测精度,并且可以通过所提出的检测方法实现负载变化、电压骤降和频率变化下的快速动态响应。采用不使用虚拟正交分量的坐标变换模块。仿真和实验结果表明,所提出的电流检测方法在稳态情况下具有较高的检测精度,并且可以通过所提出的检测方法实现负载变化、电压骤降和频率变化下的快速动态响应。
更新日期:2021-02-01
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