Damping Power System Oscillation with STATCOM

In their early years electric power systems did not reach far from the generating station. Since then power systems have been inter-connected to cover first regions and later nations. Today they extend over entire continents and contain a huge number of components that together serve to supply electric energy to the customers. The aim is to maintain the voltage and the frequency at their nominal values. To improve reliability both design and operation of power systems involve safety margins to the cost of some profit. Much effort today is spent on control and supervision that can reduce these margins, which also has environmental aspects. "Environmental and economic aspects make it difficult to build new power lines and to reinforce existing ones. The continued growth in demand for electric power must therefore to a great extent be met by increased loading of available lines. A consequence is that power system damping is reduced, leading to a risk of poorly damped power oscillations between the generators. This thesis proposes the use of controlled active loads to increase damping of such electro-mechanical oscillations. The focus is on structural aspects of controller power system damping by fact device Statcom ."