Title :
Short-circuit calculations considering converter-controlled generation components
Author :
Chen, Si ; Lund, Torsten ; Zamastil, Martin Høgdahl ; Akhmatov, Vladislav ; Abildgaard, Hans ; Gellert, Bjarne Christian
Author_Institution :
Energinet.dk, Fredericia, Denmark
Abstract :
Converter connected units are to a large extent replacing conventional synchronous machines. Most grid codes require reactive current injection from converter-controlled equipment in the power system during fault condition. At present, there is no standardized way of calculating the short circuit level in a system with a high penetration of power electronic converters. In this paper, three different methods (IEC60909, superposition and iterative) have been tested on a grid model of the West Danish power system, which has a high wind power penetration. The short-circuit currents at the short-circuit location calculated by means of these three methods show the results with a negligible difference based on the present-stage system model. However, this is because the converter-controlled wind turbines (WTs) at present constitute 7% of the installed capacity in the model. It is foreseen that the total contributed short-circuit current will be larger as the share of the converter-controlled WTs increases. The result achieved using the iterative method is more reasonable because the grid-voltage support from the converter-controlled WTs is represented in the iterative method but not in the IEC60909 or the superposition method.
Keywords :
iterative methods; power convertors; power electronics; power generation control; power grids; power system faults; short-circuit currents; wind turbines; IEC60909; West Danish power system; converter-controlled generation components; converter-controlled wind turbines; fault condition; grid codes; grid-voltage; iterative method; power electronic converters; reactive current injection; short-circuit calculations; superposition method; wind power penetration; Circuit faults; Generators; Impedance; Iterative methods; Synchronous machines; Wind power generation; Wind turbines; converter controlled wind turbines; iterative method; static short-circuit calculations;
Conference_Titel :
Energytech, 2012 IEEE
Conference_Location :
Cleveland, OH
Print_ISBN :
978-1-4673-1836-5
Electronic_ISBN :
978-1-4673-1834-1
DOI :
10.1109/EnergyTech.2012.6304664