Hybrid Multi-terminal HVDC System for Large Scale Wind Power

In this paper, a hybrid multi-terminal HVDC system, comprising current source converter (CSC) and voltage source converter (VSC), is proposed for the connection of large scale wind power into a main AC grid. In this system, VSCs are adopted at wind turbines terminal and the CSC is utilized at AC grid terminal. This proposed system combines advantages of conventional CSC-HVDC system and novel VSC HVDC system. The paper describes the principles and control strategies of the proposed system. The PSCAD/EMTDC program is used to validate the proposed system. Simulation results show that the hybrid multi-terminal HVDC system can transmit wind power into AC system stably