Abstract：Based on the 2×660 MW units of a power plant in Ximeng area, this paper studies the problem of power system subsynchronous oscillation/resonance, and puts forward the joint suppression measure based on supplementary excitation damping control (SEDC) and generator terminal subsynchronous damping control (GTSDC). The mechanism of the two systems is verified by experiments, and the oscillation attenuation characteristics of the independent scheme and the joint scheme under different working conditions are studied. The results show that the joint suppression measure based on SEDC and GTSDC achieves efficient collaborative control through parameter matching and multi time scale coordination, and significantly improves the suppression effect and response speed. Two actual fault cases verify the effectiveness and reliability of the joint suppression measure. The research also found that the sig-nal-to-noise ratio suppression effect of the speed signal is very important, so the suggestions of optimizing the reliability of the speed measurement system are put forward. The reseatch of this paper shows that the joint suppression measure based on SEDC and GTSDC can effectively solve the problem of unit subsyn-chronous oscillation, improve the dynamic stability rate of power system, and provide a technical refer-ence for the treatment of subsynchronous oscillation of similar units.
疏佳铭, 王凯, 马志恒, 张琦雪, 魏志星. 锡盟某电厂次同步振荡及SEDC与GTSDC联合抑制措施的研究与应用[J]. 电气技术, 2025, 26(7): 62-68.
SHU Jiaming, WANG Kai, MA Zhiheng, ZHANG Qixue, WEI Zhixing. Research on subsynchronous oscillation and application of the joint suppression measure based on SEDC and GTSDC in a power plant in Ximeng. Electrical Engineering, 2025, 26(7): 62-68.
2025, Vol. 26 
