Transient dynamics in electric power system with dc transmission: Fractal growth in stability boundary
نویسندگان
چکیده
This paper is concerned with transient dynamics and stability of an electric power system with dc transmission. Nowadays dc transmission systems are widely applied to conventional electric power systems. However, transient dynamics of ac/dc power systems, affected by active power which flows into dc transmissions, is not entirely understood. In this paper an unsymmetrical swing equation system is derived to analyze the transient dynamics of an ac/dc power system. The unsymmetry implies an unidirectional component of an external forcing which corresponds to both dc power and exciting power swing. This paper discusses a stability boundary and its qualitative change in the unsymmetrical swing equation system. The understanding of the stability boundary plays an important clue to grasp the transient dynamics of the ac/dc power system. We now reveal fractal structure growth in the stability boundary caused by the change of dc power flow. The existence of fractal boundary implies that the system behaviour becomes chaotic and unpredictable depending on the operation of the dc transmission.
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