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

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

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (1) : 313-322. DOI: 10.19912/j.0254-0096.tynxb.2024-1609

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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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.

Key words

wavelet analysis / power quality / measurement errors / islanding detection / harmonic impedance measurement

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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

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