Primary frequency regulation support through deloaded offshore renewable power generators with HVDC‐link

Abstract

Abstract Grid operation becomes a challenging task due to the high penetration of uncontrolled offshore renewable power generators into the mainland system through HVDC‐link system. As a result, system frequency may quickly go outside the acceptable range under severe frequency events. This paper proposes a coordinated control strategy for linearized models of deloaded offshore renewable power generators with HVDC‐link to make contributions in the mainland system during depressed frequency conditions to address the frequency regulation issue. Linearized models are used to obtain the power output from deloaded ORPG by adjusting droop value in proportional to frequency deviation and minimizing the frequency deviation of the mainland system. Inertia control scheme based on utilizing the different capacitors of HVDC‐link is proposed to further improve frequency regulation. Adding inertia from HVDC‐link helps to minimize the rate of change of frequency deviation. Finally, to improve both frequency deviation and rate of change of frequency deviation, case studies of offshore renewable power generators linking with HVDC in view of abrupt load deviations have been effectively shown on system model to validate the proficiency of control schemes in MATLAB/SIMULINKR.

Keywords

• Wind power plants
• Frequency control
• Control of electric power systems
• Distributed power generation
• Power system control
• d.c. transmission