IETE Journal of Research ( IF 1.5 ) Pub Date : 2020-12-27 , DOI: 10.1080/03772063.2020.1863162 Sindhura Rose Thomas 1, 2 , Bindu M. Krishna 3 , Usha Nair 1
ABSTRACT
A novel passive method based on Permutation Entropy (PE) is proposed for fast, efficient, and differential detection of islanding from other disturbance events in power system. The extremely remarkable attributes of PE such as efficient and fast detection of change in dynamics as well as computational and conceptual simplicity can be appropriately utilized to devise a thresholding system that can differentiate the change in dynamics of islanding event from the non-islanding ones with negligible Non-Detection Zone (NDZ). As NDZ is the most critical issue of existing passive islanding detection methods, which overshadows its beneficial characteristics, this new approach can prove to be a suitable alternative with an added benefit of faster detection. The method is evaluated with grid connected single as well as multi-DG systems and its robustness against effects of load quality factors, active and reactive power mismatches is investigated. Results show that this method can detect the islanding disturbance and differentiate it from other disturbances within half a cycle. The performance of the proposed method is evaluated with photovoltaic (PV) sources and also validated on IEEE 14 bus model. Results indicate the suitability of the PE method for the common DG source of PV for a wide range of power mismatches including the worst cases and also its robustness against false tripping during DG switching. The results verify the credibility and advantage of the proposed PE thresholding method and its suitability for adopting into existing networks for passive islanding detection.
中文翻译:
排列熵阈值:一种用于孤岛检测的非线性信号处理方法
摘要
提出了一种基于排列熵 (PE) 的新型无源方法,用于从电力系统中的其他扰动事件中快速、高效和差异化地检测孤岛现象。PE 的极其显着的属性,例如动态变化的高效和快速检测以及计算和概念的简单性,可以适当地用于设计一个阈值系统,该系统可以区分孤岛事件和非孤岛事件的动态变化,可以忽略不计非检测区 (NDZ)。由于 NDZ 是现有被动孤岛检测方法中最关键的问题,这掩盖了其有益特性,因此这种新方法可以证明是一种合适的替代方法,具有更快检测的额外好处。该方法在并网的单 DG 和多 DG 系统中进行了评估,并研究了其对负载质量因素、有功和无功功率不匹配影响的鲁棒性。结果表明,该方法能够在半个周期内检测出孤岛扰动并与其他扰动区分开来。所提出方法的性能通过光伏 (PV) 源进行评估,并在 IEEE 14 总线模型上进行了验证。结果表明 PE 方法适用于 PV 的公共 DG 电源,适用于各种功率失配,包括最坏的情况,并且它对 DG 切换期间的误跳闸具有鲁棒性。结果验证了所提出的PE阈值化方法的可信度和优势及其适用于现有网络的被动孤岛检测。