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The probability analysis method of theoretical line loss (TLL) is an emerging TLL assessment method in recent years, which can consider the impact of random changes in load, power source, and other factors on the line loss rate, and can accurately evaluate the distribution range of line loss rates in a specific power grid in the long, medium, and short term. A monthly probability theoretical line loss calculation method of low-voltage network (LVN) based on simultaneous power and electricity is proposed in this paper. This method firstly converts hourly calculations of line loss into every 20 minutes calculations, which can shorten the calculation interval based on the first power, last power, and electricity collected in every hour by the user&#x2019;s smart meter. Then, based on improved K-means clustering method (KCM) and non-parametric Kernel density estimation, the load probability distribution model is established, and the acceptance-rejection sampling method (ARSM) is used to generate the power random samples of each user&#x2019;s load for every 20 minutes in a month. The three phase power flow of each simulation sample is calculated by using the injection Newton&#x2019;s method. Then, the monthly TLL is accumulated. Finally, based on the IEEE-13 buses and IEEE-33 buses standard distribution system, the simulation results showed that the proposed method can more accurately and effectively calculate the monthly probability TLL of LVN compared with the line loss calculation method based on daily and hourly electricity.

Monthly Probability Theoretical Line Loss Calculation Method of Low Voltage Distribution Network Based on Simultaneous Power and Electricity