Contributions to security of electric power systems

Electricity supply is a fundamental need of a modern society. A crucial property of electricity supply reliability, is achieved by keeping a power system in a secure state most of the time. A secure state means, that the risk of a disturbance to spread further and endanger the system integrity, resulting into supply interruptions, is minimal. Keeping a power system secure is a very challenging interdisciplinary multidimensional problem, which is affected by many factors. Besides the ones, which can not be influenced such as extreme weather condi¬ tions or natural disasters, there is a set of factors given by the design of the system and its operation, which can be denoted security concept. Recent trends have introduced conditions, in many power systems, in which a traditional security concept experiences shortcomings. This thesis proposes modifications of the principles of the existing se¬ curity concept. In case of several modifications, this thesis goes further into details. Explicitly, this thesis describes an index expressing the system security in an alternative manner to well known N-l criterion, proposes a control method handling a larger dimensional problems , which are typical for power systems, and suggests a framework for a better control impact evaluation. All detailed proposals are supported by simulation and computation examples.

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