For long distance transmission, the transmission capacity of
cables may be mainly occupied by the produced reactive
power, therefore ac transmission will meet difficulties. In this
situation high voltage direct current (HVDC) transmission
techniques may be used. The new technology, voltage source
converter based HVDC system, provides new possibilities for
performing voltage regulation and improving dynamic
stability of the wind farm as it will be possible to control the
reactive power of the wind farm and perhaps keep the voltage
during the faults clearance and fast reclosures in the onshore
transmission system.