Dmitrova, Evgenia4; Wittrock, Martin Lindholm1; Jóhannsson, Hjörtur1; Nielsen, Arne Hejde1
1 Department of Electrical Engineering, Technical University of Denmark2 Center for Electric Power and Energy, Department of Electrical Engineering, Technical University of Denmark3 Electric power systems, Center for Electric Power and Energy, Department of Electrical Engineering, Technical University of Denmark4 Energinet.dk
This paper presents a method to determine suitable countermeasures against emerging aperiodic small disturbance rotor angle (ASD) instability. The method utilizes stability indicators, computed in real time, to define a criterion for ASD stability. Sensitivities of these stability i ndicators are then determined and used to identify the most in fl uential nodes for counter measures. To increase the computational speed, only nodes visited by a self-propagating graph, rooted at the vulnerable generator, will have their sensitivities calculated. The steady state voltages after a given counter measure are then determined, using a grid transformation coefficient (GTC) and a numerical, iterative solution to an equation system. The stability criteriacan then be assessed to evaluate the sufficiency of a suggested counter measure. The method is demonstrated on a synthetic 8-bus network and a 464-bus model of the Western Denm ark transmission grid. The method successfully demonstrates its ability to efficiently identify and evaluate counter measures for a large, practical system.
Ieee Transactions on Power Systems, 2015, Vol 30, Issue 4, p. 1784-1792
Power system control; Power System Security; Power system simulation; Power system stability