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A modified active frequency islanding detection method based on load frequency and chopping fraction changes
International Transactions on Electrical Energy Systems ( IF 2.3 ) Pub Date : 2021-07-19 , DOI: 10.1002/2050-7038.13033
Ahmed G. Abo‐Khalil 1, 2 , Ali M. Eltamaly 3, 4 , Walied Alharbi 1 , Abdel‐Rahman Al‐Qawasmi 1 , Mohammad Alobaid 5 , Ibrahem M. Alarifi 5
Affiliation  

To carry out the study and simulations of anti-islanding systems, it is necessary to take into account the generic system proposed by the IEEE 929-2000 and IEEE 1547 standards, where the network, the RLC load, and PV inverter are connected in parallel to the PCC. The IEEE 929-2000 standard defines the quality factor to have a standard test condition. The paper presents a modified Active Frequency Drift (AFD) algorithm to detect the islanding of grid-connected photovoltaic (PV) systems with low harmonics levels without degrading their power factor. Severe issues such as deterioration in power quality and electric shock can occur when a PV inverter operates in islanding mode. Various islanding detection techniques have been investigated in the literature in the last two decades among which, AFD is a typical method. However, a prominent drawback of AFD is its relatively large Non-Detection Zone (NDZ). The improved AFD method that this paper suggests allows the frequency of the inverter current to be controlled slightly lower (or higher) than the frequency of the terminal voltage. The islanding condition is detected by calculating the changing parameter that relates to the change of the chopping fraction and the line frequency periodically. The frequency deviation is then detected to determine the chopping and a changing parameter, which accumulates to the threshold value when the inverter is shut down. The proposed algorithm overcomes the conventional AFD issues by improving the accuracy of detection, eliminating the NDZ, and reducing the current harmonic distortion. The proposed method is validated with the help of simulated and experimental results of a 350 W PV inverter using IEEE Standards.

中文翻译:

一种改进的基于负载频率和斩波分数变化的有源频率孤岛检测方法

为了进行反孤岛系统的研究和模拟,需要考虑 IEEE 929-2000 和 IEEE 1547 标准提出的通用系统,其中网络、RLC 负载和光伏逆变器并联连接到 PCC。IEEE 929-2000 标准定义了具有标准测试条件的品质因数。本文提出了一种改进的有源频率漂移 (AFD) 算法,以检测具有低谐波水平的并网光伏 (PV) 系统的孤岛,而不会降低其功率因数。光伏逆变器在孤岛模式下运行时,可能会出现电能质量恶化和触电等严重问题。在过去的二十年里,文献中已经研究了各种孤岛检测技术,其中,AFD 是一种典型的方法。然而,AFD 的一个突出缺点是其相对较大的非检测区 (NDZ)。本文提出的改进的 AFD 方法允许将逆变器电流的频率控制在略低于(或高于)端电压的频率。通过计算与斩波分数和线路频率的周期性变化相关的变化参数来检测孤岛状况。然后检测频率偏差以确定斩波和变化的参数,当逆变器关闭时,该参数累积到阈值。所提出的算法通过提高检测精度、消除NDZ和减少电流谐波失真来克服传统的AFD问题。
更新日期:2021-07-19
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