Considerations of kVA capacity of power compensation systems for DC transmission system including wind turbine generating systems

An integrated wind turbine generating system in a DC transmission system with power compensation systems has been proposed and its steady-state performances have been analyzed. In this paper, the kVA capacity of the power compensation systems connected to the sending-end and the receiving-end grids and wind turbine generators is discussed. A set of system equations is first derived. The effects of the sending-end grid conditions on the kVA capacity of the power compensation systems are explored. It is shown that, although the effect of the sending-end grid power factor on the kVA capacity of the sending-end compensation system is small, the effect of the power factor on the kVA capacity of the receiving-end compensation system is large. The appropriate turns ratios of the transformers are also studied. Finally, the kVA capacity of the wind turbine generators is discussed.