THRESHOLD EVALUATION OF DISTRIBUTION NETWORK LINE LOSS RATE CONSIDERING PHOTOVOLTAIC FLUCTUATION

Zhou Qun; Chen Canyu; Qing Yifan; Dian Yulin; Leng Minrui; Liu Xueshan

doi:10.19912/j.0254-0096.tynxb.2023-1019

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (10) : 354-362. DOI: 10.19912/j.0254-0096.tynxb.2023-1019

THRESHOLD EVALUATION OF DISTRIBUTION NETWORK LINE LOSS RATE CONSIDERING PHOTOVOLTAIC FLUCTUATION

Zhou Qun, Chen Canyu, Qing Yifan, Dian Yulin, Leng Minrui, Liu Xueshan

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Abstract

An evaluation method for the fluctuation threshold of 10 kV distribution network line loss rate is proposed in this article, which takes into account the fluctuation of photovoltaics, to address the issue of high leakage rate caused by the unreasonable judgment threshold of abnormal line loss rate after distributed photovoltaic access. Firstly, the grid connection form of distributed photovoltaic electricity and possible abnormal electricity situation are analyzed. Secondly, the long short term memory （LSTM） network is used to fit the nonlinear relationship between input features and line loss rate to predict line loss rate, replacing the method of calculating line loss rate based on measured data in power flow. Then, based on the weather type SCF index, Monte Carlo simulation is used to reflect the volatility of photovoltaic power generation,to obtain the probability density function of distribution network line loss rate considering the randomness of photovoltaic power generation, and use this to determine the abnormal judgment threshold of line loss rate. Finally, taking IEEE 37 bus distribution system as an example, the probability density distribution of daily line loss rate of distribution lines afterphotovoltaic access is actually evaluated under the condition of considering meteorological factors, and is compared with the traditional determination threshold of the grid.

Key words

distributed photovoltaic / line loss / distributed network / long short-term memory network / abnormal photovoltaic metering points / SCF index

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Zhou Qun, Chen Canyu, Qing Yifan, Dian Yulin, Leng Minrui, Liu Xueshan. THRESHOLD EVALUATION OF DISTRIBUTION NETWORK LINE LOSS RATE CONSIDERING PHOTOVOLTAIC FLUCTUATION[J]. Acta Energiae Solaris Sinica. 2024, 45(10): 354-362 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1019

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