Матричний метод визначення показників надійності розгалужених розподільних електричних мереж

Abstract

The reliability of 10 kV electrical distribution networks due to the considerable length and radial construction scheme is significantly low. According to the Resolution of the National Commission for Regulation ofPublic Utilities No 1175 of 05.10.2018 “On Approval of the Procedure for Establishing (Forming) Tariffs for Electricity Distribution Services” there are long-term goals of achieving SAIDI indicators of 150 minutes for urban areas and 300 minutes for rural areas and Resolution of the National Commission for Regulation of Economic Competition No 1550 of 12.08.2020 \"Procedure for ensuring quality standards of electricity supply and providing compensation to consumers for non-compliance\" which regulates the quality standard of electricity supply and regulates compensation to consumers for non-compliance with these standards.Reclosers are used to increase the reliability of electricity supply, to reduce the number of de-energized consumers in case of short circuits by sectioning the overhead power line and the possibility of reserving it another substation and to install short circuit indicators that significantly reduce the duration of damage. The topical issue is the choice of places to install reclosers, which will provide the greatest effect of improving the reliability of electricity supply.This article proposes a matrix method for determining the reliability of electrical distribution networks, which simplifies the calculation and partially automates the determination of the location of reclosers. The method is based on the use of a path matrix (transfer current ratio). The method allows to consider the affiliation of detached segments of overhead power line to the trunk and branches, according to their differentiated impact on reliability. The method applicability was tested on the power distribution line “F-11 of Khmelnytskyi REM” with an overall long of 44.68 km (the length of the main trunk line is 22.15 km). The expediency of dividing the line into three sections with the installation of two sectional reclosers, and one more recloser used for redundancy the adjacent line is shown. Preset value of the SAIDI indicator (300 min.) is reached after setting additional six short-circuit indicators.