Abstract
Power systems are a class of typical cyber-physical systems with switching-hybrid dynamics. With the innovation of power electronics technology and the implementation of power grid development strategy, the application of voltage source converter-based high voltage direct current (VSC-HVDC) transmission has been paid more and more attention. Firstly, the general small-signal model of the VSC-HVDC system is established, and its stability analysis is carried out by integrated modal analysis, participation factor analysis, and sensitivity analysis methods. It is clarified that the system controller parameters will have a significant impact on the stability of the VSC-HVDC system. Then, based on the switching system theory, the stabilising switching law of the bidirectional converter is derived, which makes the system energy attenuate fastest, and the stabilising switching controller is designed according to the switching law. Last, the effectiveness of the controller is verified by simulation, and the superiority of the stabilising switching control strategy is proved from the theoretical and simulation aspects by comparison with the traditional current vector control strategy.
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