Modelling DC backup system with Simpow

Abstract

Oskarshamn Nuclear Power Plants DC backup systems are vital parts of the operation. In case of fault in or outside the power plant this particular system has to continuously supply voltage in order to keep important loads in operation. The DC backup system of the Oskarshamn Nuclear Power Plant has not been modelled and the main purpose of this work is to model the DC backup system with Simpow software. In this master thesis work a small part of the DC backup system is modelled with Simpow. First the data concerning all the components is gathered from the Oskarshamn Nuclear Power Plant. All gathered information are put into the Simpow power simulation software. Converters in the software and at Oskarshamn Nuclear Power Plant are studied. A Simpow standard converter model is used and parameters are set according to the manufacturers data. The factory acceptance tests that are obtained from the manufacturer are used for Simpow standard model unknown parameter adjustments. A simple battery model is built in the simulation. The Simpow rectifier regulators behaviour is studied. Different values of the important parameters are shown in Chapter 5 figures in modelling steps. The simple battery model responses with different values for its parameters are studied and shown in Chapter 5 figures. After individual tests of the modelled components, simulations of the UPS system with four different scenarios are executed according to the manufacturers’ factory acceptance tests. This master thesis work concludes that the Oskarshamn Nuclear Power Plant DC backup system can be modelled with Simpow power simulation software.