Standardisation of MV substation configurations in HV/MV substations

摘要

To serve the increasing use of electric power the electric power system has been developed in the past century. In the Stedin service area a significant amount of substations dated from the mid 60ties to the mid 80ties. Due to several reasons these substations are nominated to be replaced. Replacement of a substation gives the opportunity to reconsider the basic assumptions taken 40 years ago and adapt them to current needs.In this paper a standard MV (here: 10, 13 and 23kV) substation configuration is defined. Therefore five different busbar configurations are considered and evaluated via a multi criteria analysis. The results of the multi criteria analysis show that the two sections single and double busbar concept emerge dominantly. It can be concluded that:1. it is preferred to have two sections in separate rooms.2. the single busbar concepts scores slightly better than the double busbar concept.Applying a single busbar concept leads to straightforward distribution grid design which makes it possible to apply distribution automation functions, such as Self Healing Grids, more easily.These concepts are applied in a case study of the replacement of 50/10 kV substation Utrecht Leidseveer. In simulation software a reliability model of the current situation, application of two sections single busbar concept and the application of two sections double busbar concept have been setup. The reliability model has been used to evaluate the three concepts on the SAIFI and SAIDI parameters. For the single busbar concept is was necessary to adapt the distribution grid which is incorporated in the reliability model accordingly. It turned out that the single and double busbar concept perform better on the SAIFI parameter than the current situation. On the SAIDI parameter the current situation and the single busbar concept behave more or less the same while the double busbar concept performance is worse. On one hand this has to do with the operation of the current substation while on the other hand the healthy busbar is not directly available after a busbar failure in a double busbar system.The overall conclusion of this paper is that both the multi criteria analysis as well as the reliability evaluation of the busbar concepts show that the two section single busbar emerge best.