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Hybrid Control of Voltage Collapse in Power Systems


T. Geyer, M. Larsson, M. Morari

vol. AUT02-12

For about two decades, power systems have been operated close to their stability limits mainly due to environmental constraints on the extension of the transmission capacity, increased electricity consumption and financial considerations resulting from the deregulation of the energy markets. This has increased the risk, that under heavy load a power system becomes unstable exhibiting slow voltage drops which may lead to a voltage collapse resulting in a black-out. Power systems incorporate not only nonlinear dynamics but also discrete events and some of the manipulated variables are discrete, too. After having approximated the nonlinear dynamics by PWA dynamics, the hybrid power system has been described by an MLD model. As a case study with four buses shows, MPC is capable of predicting and preventing a voltage collapse. Further work is needed to make the MPC scheme more robust and to enlarge the size of case study. The long-term aim is to develop a novel control scheme to avoid voltage collapse and widespread outages. Modern measurement devices allow the implementation of decision support tools that continuously monitor the system state and suggest preventive and emergency control actions to be taken by the operators. If these tools prove to work successfully, fully automatic control systems might be implemented that do not require operator intervention.

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(04)Technical Report

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% Autogenerated BibTeX entry
@TechReport { GeyLar:2002:IFA_167,
    author={T. Geyer and M. Larsson and M. Morari},
    title={{Hybrid Control of Voltage Collapse in Power Systems}},
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