Unified reference controller for flexible primary control and inertia sharing in multi-terminal voltage source converter-HVDC grids
Location: Canada
Publication date: 2016-10-11
Published in: IET Generation, Transmission & Distribution, October 2016
ref. DOI: 10.1049/iet-gtd.2016.0665

Local members

Alvaro Luna

PhD. Senior Researcher.

Jose Ignacio Candela

PhD. Senior Researcher. Project Responsible

Weiyi Zhang

Junior Researcher

Kumars Rouzbehi

Junior Researcher



Multi-terminal dc (MTDC) grids are expected to be built and experience rapid expansion in the near future as they have emerged as a competitive solution for transmitting offshore wind generation and overlaying their ac counterpart. The concept of inertia sharing for the control and operation of MTDC grids, which can be achieved by the proposed unified reference controller. The control objectives of the MTDC grids voltage source converter (VSC) stations are no longer limited to the stabilisation of MTDC grid, instead, the requirements of ac side are also met. The interaction dynamics between the ac and dc grid is analysed to illustrate the proposed concept. In addition, the voltage source converter stations can work in different operation modes based on the proposed unified control structure, and can switch among the operation modes smoothly following the secondary control commands. Simulation results exhibit the merits and satisfactory performance of the proposed control strategy for stable MTDC grid operation.