Dynamic Properties of Interconnected Power Systems - A System Theoretic Approach

Standard methods of system theory and control engineering are used to investigate the stability and performance of power units connected in series. The systems are first modelled in a normal multi-input multi-output form, and the dynamic properties are characterized in terms of poles and zeros. The series connection of such systems is shown to be of a similar normal form, and the internal and input-output stability can then be analyzed based on the general theory. The "minor loop gain", which has long been used to study the stability of connected power systems, is shown to be a natural result of the system theoretic approach