Communication-Free Inertia and Frequency Control for Wind Generators Connected by an HVDC-Link

Abstract

This letter introduces a communication-free control scheme that allows wind generators connected by an HVDC-link providing inertia and primary frequency control services to the mainland system. The scheme consists of making the offshore and onshore frequency deviations proportional. It relies on frequency regulation at the offshore converter and dc voltage control with power and frequency droops at the onshore converter. This letter provides a mathematical formulation of the system and a discussion on application challenges related to the control scheme.