Modeling of a Fault Ride Through in Transmission System with Distributed Hydropower Production

Abstract

As part of the development plan for the European Transmission Network, the European Network of Transmission System Operator (ENTSO-E) proposed the creation of a Network code dealing the requirements for the grid connections of generators (NC RfG) which came into effect on May 17th, 2016. The response to the ENTSO-E network code, the Norwegian Transmission System Operator (TSO) formulated updates to the Norwegian Power System. These updates were based on ENTSO-E requirements for synchronous Power Generating Modules of types B, C and D. With that in mind, the project for this thesis involved the testing of the Norwegian TSO recommended values on the distribution of hydropower generators based in the Telemark region. The testing was conducted using PowerFactory and OpenIPSL with a simulation of five cases. The simulation cases were designed to test a balanced three-phase short circuit occurring on the 300, 132, 66 and 22 kV sections of the central and regional transmission networks. Fault simulations on the 300 kV and 132 kV regional distribution networks showed positive results with few exceptions. The 66 kV and 22 kV networks were highlighted as the ones requiring improvement. This thesis report will present the studies and the simulations conducted along with the results and conclusions drawn from the simulations with the aim of finding an enhanced way forward in the area of power generation and transmission.