Abstract
Today's power systems are characterized in that more power demand is concentrated in urban areas, increasingly centralized power facilities are getting larger in size and located in remoter places, and power condensers tend to be upgraded in order to improve power factor. These movements each reduce the stability power limit, permitting the effect of a power failure to spread much further.
In such an interconnecting power system, when power is transmitted from a power source (a small system) in a remote place to a big city (a large system) with great power demand, a zero-power flow phenomenon, where power transmission is impossible when power flow in the interconnecting power system is zero, is expected to occur, depending on a combination of the size of branch load and its power factor. In future power systems that will extend further, have a larger capacity, and be more capacitive, such a phenomenon woud be more liable to take place. In this thesis, a new formula to analyze a zero-power flow phenomenon is derived, and using the formula, areas in which a zero-power flow phenomenon takes place are also discussed. With an experimental system simulating a practical 500kV power system, the occurrence of a zero-power flow phenomenon could be verified.
