Operation and Coordinated Control of Multi-terminal VSC-HVDC Transmission System for Wind Power Generation

The multi-terminal DC (MTDC) is anticipated as a flexible and reliable solution for the large scale wind power transmission. This paper investigates the use of voltage source converter (VSC) based MTDC system for outward transmission of the large scale wind power. A MTDC system for aggregating and dispatching wind power is proposed firstly. And then the coordinated control strategy for the proposed MTDC system is discussed. Finally, a four-terminal MTDC system connecting two DFIG-based wind farms, the local and remote grids is simulated for demonstrating the performance of the MTDC system during wind speed variations and DC line faults. The results show that the proposed MTDC system and control strategy can reallocate the wind power in the DC network to achieve a constant power for long distant transmission to the load center.