Marek Wancerz

Power system stability screening for long-term planning of transmission network development

Stability analyses of a power system are performed at short-term and mid-term planning of transmission network development. Increased load demands and market economics are pushing transmission networks closer and closer to their operational limits. Therefore it is necessary to perform even a simplified power system stability assessment also at long-term planning. The article shows that very simple criteria of angle stability and voltage stability based on short-circuit power can be used as screening filters for fast contingency selection. The suggested criteria have been verified for a real large-scale system.

Short-circuit power as important reliability factor for power system planning

Detailed stability analyses of a power system are performed at short-term and mid-term planning of transmission network development. At long-term planning, due to the uncertainty of power system data, the stability analyses are either omitted or performed in a simplified method. Currently, due to the economical and ecological reasons, the power system operators are interested to use the transmission network as close as possible to the thermal and stability limits. Therefore it is necessary to perform even a simplified power system stability assessment also at long-term planning. The paper shows that very simple criteria of angle and voltage stability based on short-circuit power can be used for the sake of long-term planning. The suggested criteria were verified for a real large-scale power system.