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In a contemporary bulk power system, the voltage instability phenomenon caused by insufficient power supply capability to load of constant power type is becoming an important problem. On the other hand, the increase of the short circuit capacity of power system is also becoming a serious problem, which may deteriorate the voltage stability. In this paper, the static and dynamic characteristics of power supply to each load in hybrid AC-DC power system are analyzed by using static and transient P-V curves respectively. In this analysis three kinds of DC transmission system control schemes are compared. It is made clear that the DC transmission system has an advantage of increasing power supply capability at an inverter node. Also made clear is that constant firing angle-constant current control makes it possible to provide the inverter node with a larger power than the two conventional control methods, such as constant current-constant voltage control and constant power -constant extinction angle control methods. Transient digital simulations show that the DC interconnection improves the voltage stability under opening of DC inerconnected line or one-line opening of AC double-circuit interconnected lines.

The Influence of AC-DC Parallel Interconnection on Voltage Stability of AC System