结合小波包能量熵和Goertzel算法的改进谐波阻抗测量的孤岛检测方法

李卓雅; 曾成碧; 苗虹

doi:10.19912/j.0254-0096.tynxb.2024-1609

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太阳能学报 ›› 2026, Vol. 47 ›› Issue (1) : 313-322. DOI: 10.19912/j.0254-0096.tynxb.2024-1609

结合小波包能量熵和Goertzel算法的改进谐波阻抗测量的孤岛检测方法

李卓雅, 曾成碧, 苗虹

作者信息 +

ISLANDING DETECTION METHOD BASED ON AN IMPROVED HARMONIC IMPEDANCE MEASUREMENT METHOD COMBINING WAVELET PACKET ENERGY ENTROPY AND GOERTZEL ALGORITHM

Li Zhuoya, Zeng Chengbi, Miao Hong

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文章历史 +

摘要

针对降低扰动对电能质量的影响、提高测量精度和减小检测盲区3个方面,提出一种结合小波包能量熵和Goertzel算法的改进谐波阻抗测量的孤岛检测方法。该方法根据PCC处谐波电压信号特征采用小波包能量熵和谐波电压变化率的Goertzel算法提高疑似孤岛状态的判断,对系统疑似孤岛状态,提出改进注入式谐波阻抗测量的孤岛检测,以降低间歇注入扰动信号对系统电能质量的影响。考虑检测精度、电能质量与检测盲区,提出注入谐波电压限值选定原则,在PCC注入该限值谐波电压,获得谐波阻抗及其灵敏度系数p,实现系统孤岛状态的最终判定。通过Matlab仿真验证所提方法有效性。

Abstract

An islanding detection method combining wavelet packet energy entropy and Goertzel algorithm to improve the harmonic impedance measurement is proposed to reduce the impact of disturbances on power quality, improve the measurement accuracy and reduce the detection blind zone. The method adopts the wavelet packet energy entropy and the Goertzel algorithm for harmonic voltage change rate to improve the judgement of the suspected islanding state according to the characteristics of the harmonic voltage signal at the PCC point （point of common coupling）, and proposes to improve the islanding detection of the injected harmonic impedance measurement for the suspected islanding state of the system in order to reduce the impact of intermittent injected disturbing signals on the power quality of the system. Considering the detect ion accuracy, power quality and detection blind area, the principle of selecting the limit value of injected harmonic voltage is proposed, and the harmonic voltage with this limit value is injected at the PCC point to obtain the harmonic impedance and its sensitivity coefficient p, which realises the final determination of the system islanding state. The effectiveness of the proposed method is verified by Matlab simulation.

导出引用

李卓雅, 曾成碧, 苗虹. 结合小波包能量熵和Goertzel算法的改进谐波阻抗测量的孤岛检测方法[J]. 太阳能学报. 2026, 47(1): 313-322 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1609

Li Zhuoya, Zeng Chengbi, Miao Hong. ISLANDING DETECTION METHOD BASED ON AN IMPROVED HARMONIC IMPEDANCE MEASUREMENT METHOD COMBINING WAVELET PACKET ENERGY ENTROPY AND GOERTZEL ALGORITHM[J]. Acta Energiae Solaris Sinica. 2026, 47(1): 313-322 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1609

中图分类号： TM743

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