System Protection Schemes in Eastern Denmark

The Ph.D. project investigates different aspects of voltage stability in the power system of Eastern Denmark taking into account the large amount of wind power. In the project, a simple System Protection Scheme (SPS) against voltage instability in Eastern Denmark is developed. Phasor Measurement Units placed at strategic points are evaluated as an efficient tool for power system monitoring of important 400 kV and 132 kV transmission corridors in Eastern Denmark. Real-time phasor measurements are utilized for tracking power system dynamics during a number of severe power system disturbances that are characteristic for the Eastern Danish power system, such as wind farm rejection, cascading line outages and power oscillations. E.g. Nordic inter-area oscillation modes and damping were easily detected from phasor data during the outage of the 400 kV tie-line between Eastern Denmark and Sweden. One case study demonstrates that the recorded power system response is consistent with the simulation results. The PMU units could enable the system operator to detect catastrophic events in due time and issue remedial orders in the power system.

Autorentext

Joana Rasmussen was born in Skopje, Republic of Macedonia 1971. She received M.Sc. degree from from the Technical University of Denmark (DTU) in 1999 and a Ph.D. degree from DTU in 2006. Her industrial experience includes employment as engineer at the Danish Electrical Utilities (DEFU), Energinet.dk and the consultant company COWI A/S.