The wind-thermal bundling system based on a hybrid three-terminal HVDC transmission and the control strategies for each converter are raised to deliver large scale wind power to load center. This hybrid MTDC system consists of two line-communicated converters (LCC) which are connected to sending side, and one voltage source converter (VSC) at the grid side. The LCC1 controller at the wind farm side is designed to control active power and track maximum power while the LCC2 controller at the thermal power plant side, which is in DC current control mode, can compensate power fluctuation. VSC controller at the receiving end is proposed to control DC bus voltage and reactive power so it can operate the fault at the AC bus and the local load mutation. Simulation results demonstrate the effectiveness of the proposed control strategies. The proposed scheme combines advantages of both LCC and VSC HVDC systems and provides a new way to transmit long distance wind power to the main grid.