Stability of ultra long distance AC power transmission lines with controlled shunt compensation devices

An overview of AC and DC transmission systems in China has been made and it is shown that many DC transmissions from 2500 to 4400 km can successfully be substituted by AC ones with certain set of controlled shunt compensation devices. Investigations of operating conditions and small signal stability for ultra long-distance power transmission lines as well as analysis of transient processes have been carried out. It is shown, that parallel operation of controlled shunt reactor and synchronous compensator at one node significantly expands the range of possible line lengths and allows the implementation of power transmission modes close to surge impedance power. A special line property, associated with impossibility of long line operation only with static compensation devices, at full angle of transmissions larger than 180 electrical degrees, does not appear in such a scheme.

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