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Voltage stability and control modes in HVDC systems

In this paper, according to the classical definition of the voltage stability of a load connected to a generator through a transmission line, a criterion called voltage stability index (VSI) which can be used to determine the voltage stability of the converter AC bus is proposed. A numerical algorithm to calculate the VSI is also developed, which is based on the linearization of the AC/DC system equations. Using the algorithm, the voltage stability of a typical HVDC inverter AC bus under several common used control modes is investigated.