Pedersen, Knud Ole Helgesen1; Nielsen, Arne Hejde1; Poulsen, Niels Kjølstad3
1 Department of Electrical Engineering, Technical University of Denmark2 Department of Informatics and Mathematical Modeling, Technical University of Denmark3 Department of Applied Mathematics and Computer Science, Technical University of Denmark
Methods for estimating the short-circuit impedance in the power grid are investigated for various voltage levels and situations. The short-circuit impedance is measured, preferably from naturally occurring load changes in the grid, and it is shown that such a measurement system faces different kinds of problems at different locations in the grid. This means that the best measurement methodology changes depending on the location in the grid. Three typical examples with different measurement problems at 400 kV, 132 kV and 400 V voltage level are discussed.
Iee Proceedings-generation Transmission and Distribution, 2003, Vol 150, Issue 2, p. 169-174