The work proposes and analizes complex network-based controllers for HVDC transmission
lines. Two different control approaches are studied: Distributed PID strategies,
which take into account just local information of the state of each single node,
and Global PID algorithms, in which the control action for each node depends on
the state of the whole network. Both control techniques are tested and numerically
validated on a model of the North Sea Transnational Grid, which is a project of connecting
already existing off-shore power plants in northern Europe countries with
each other and with mainland distribution stations.
The thesis is structured in seven chapters: the first chapter is an introducion
about HVDC transmission lines, the second contains the main theoretical aspects
of complex networks, the third and fourth chapter are more technical and they
are about the study case. The above indicated control strategies are compared
and discussed along with the simulation results in chapters five and six. Finally
conclusions and suggestions for further research works are drawn in chapter seven.
