基于电磁辐射时延估计的串联光伏直流电弧故障定位方法

doi:10.19595/j.cnki.1000-6753.tces.220076

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Abstract

Series DC arc faults can cause severe electric fire hazards for photovoltaic (PV) systems due to no natural zero crossing in the arc current. Except for identifying an arc fault, locating the hidden trouble points is also a priority that needs to be addressed in preventive maintenance for PV systems. A fault location method based on generalized cross-correlation delay estimation using arc electromagnetic radiation signal was proposed to solve this issue. An experimental platform was built to investigate the arc features for the arc fault location, as shown in Fig.A1.

Fig.A1 Schematic diagram of experimental device circuit
The arc electromagnetic radiation signals are collected and analyzed in time and frequency domains. These signals demonstrate significant transient changes in amplitude during the early stage of an arc, which is proportional to the current changing rate. Accordingly, the Vivaldi antenna with relatively balanced antenna performance was selected to measure the arc electromagnetic radiation by performance comparison, which has a bandwidth of 100 MHz to 1 GHz. The time delay of the arc radiation varying as a function of the distance can be used for the arc fault location. Therefore, an antenna array of four Vivaldi antennas was applied for the arc fault location, as shown in Fig.A2. The antennas were deployed at the vertex of a regular triangular pyramid with a 1 m edge length.

Fig.A2 Measure the location of antenna and arc faults
The maximum likelihood weighting algorithm was used to reduce the influence of signal noise. At the same time, the least square method was used to fit the peak value of the cross-correlation spectrum of radiation signals to improve the accuracy of spectrum calculation.
Finally, experimental results show that the location error of the proposed method is within 15 %, as shown in Tab.A1. This paper provides a basis for applying the arc fault location strategy based on arc electromagnetic radiation.
Tab.A1 Actual value of fault arc location

Key words： Photovoltaic system series DC arc fault location Vivaldi broadband antenna generalized cross-correlation delay estimation

Received: 16 January 2022

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TM501+.2

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	Wang Yao
	Ma Tongtong
	Zhao Yuchu
	Zhu Chen
	Xing Yunqi

Cite this article:

Wang Yao,Ma Tongtong,Zhao Yuchu等. Series DC Arc-Fault Location Method Based on Electromagnetic Radiation Delay Estimation for Photovoltaic Systems[J]. Transactions of China Electrotechnical Society, 2023, 38(8): 2233-2243.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.220076 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I8/2233

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