In recent works, a method based on the eigenvalue decomposition technique, known as modal analysis, had been applied to the voltage stability analysis of multi-infeed HVDC power systems. In this method, not only the critical eigenvalues are useful in evaluating the voltage stability of the system, but their associated eigenvectors also contain information on the most severe disturbances to the system. In this paper, the use of these modal information for such analysis is further exploited. In particular, bus participation factors are used to identify the critical AC communication bus for effective remedial measures to be implemented. The significant influence of power system parameters on the bus participation factors are also investigated.
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