This paper introduces the overall structure and design scheme of the control and protection system for ±1 100 kV UHVDC, the self-supervision and fault handles about its special redundant device faults are especially discussed. For the faults of redundant pole control units, the supervision logic of the pole protection units are improved, so as to prevent all protection units from out of service simultaneously. For the faults of redundant converter control devices, the correlative converter will exit by the bypass switch close order from the control device for this pole. The methods will improve the reliability of the ±1 100 kV UHVDC, and the simulation results show the effects and feasibility of the methods.