Abstract:In view of the characteristics of China''s electric power development, this paper takes a thermal power plant in Northeast China as an example to discuss the possible sub-synchronous oscillation risk caused by HVDC transmission. This paper takes Xingren Power Plant as the research object, which combined with the grid structure of the power plant. The risk analysis method of sub-synchronous oscillation based on UIF is used to analyze the risk of torsional vibration of the unit shafting in Xingren Power Plant under DC island operation mode. In view of this situation, in order to eliminate the harmfulness of sub-synchronous oscillation to the safe and stable operation of units and power grids in Xingren Power Plant, the solution of installing TSR device in power plant is put forward in consideration of economy and safety and stability. This paper introduces the characteristics and functions of TSR device. The simulation waveform of divergent amplitude of modal 1 under DC islanding mode is used as the input of TSR device. The operation characteristics of TSR device under this excitation are verified. It shows that TSR device can effectively protect the safe and stable operation of shafting system of generating unit, and verifies the feasibility of this scheme. Behavior and the necessity of installing TSR devices are also verified.