A communication-less scheme that allows remote
offshore wind farms connected through HVDC links to participate
in primary frequency control and contribute to system
inertia is discussed in this paper. As a HVDC link decouples the
offshore system from the onshore side, real-time communication
of onshore frequency is normally required for the primary
frequency control loop of the wind farms. Dependance on remote
communication which could be unreliable at times is a problem.
To obviate the need for communication, appropriate droop
control on the offshore and onshore converters is used in this
paper to translate the variation in onshore frequency to an
equivalent variation on the offshore end. Thus the need for communicating
onshore frequency to the offshore side is mitigated
which ensures reliable operation. Such a communication-less
scheme is compared against the conventional approach involving
remote communication of onshore grid frequency to the wind
farm site. Along side physical and analytical justification, a case
study is presented to demonstrate that the communication-less
scheme performs similar to the conventional one in terms of
reducing grid frequency variations.