Optimalizace plánovaných odstávek v distribučních sítích

Abstract

This article deals with the scheduled shutdowns of distribution system facilities. These outages are necessary for the maintenance operations, modernisation of facilities, building of new facilities and to satisfy customers’ requirements. Study presented is based on data about outages that occurred from 2008 to 2012 in the significant part of the Czech Republic distribution system that provides electricity to approx. 958 000 customers on the area of 11067 km2. Analysis conducted on the data considers alternative causes of outages. These causes are put into three categories according to the voltage levels: HV, MV and LV. Moreover, analysis covers impact of outages on the customers. Impact is quantified by reliability indicators. By employing the data analysis, article provides calculation of costs both of individual outage and of total scheduled outages in one year period. Furthermore, this article provides multi-criteria optimization of outage costs which indicates possible optimal level of cost reductions. For this specific purpose, specialized software is developed. Software makes use of the data results of the analysis mentioned above. Moreover, in this paper are proposed and discussed in detail opportunities to reduce the number of outages and to reduce impact of scheduled shutdowns on continuous distribution indicators. Opportunities proposed are as follows:  coordination of outages in the same facility  optimization of maintenance operations according to the preventive maintenance rules  ways of live-line working  usage of reserve energy resources  building of alternative operating routes In addition, this paper provides proposal of optimisation process that could be used with IT systems available in distribution companies.