经直流送出火电机组轴系扭振保护的研究

Study on the protection of shaft torsional vibration of thermal power unit through direct current output

针对直流送出与交流串补送出中的次同步振荡的区别,从机组轴系精细化建模、关键危险截面的S-N曲线计算、保护判据、故障后数据扰动判别和记录等多个方面进行了详细的介绍,并提出了相应的针对性措施和改进建议。

Aiming to the difference of the SSO between DC and AC series compensation output, this paper introduces in detail several aspects, sueh as the fine modeling of the unit shaft, and S - N curves calcula｜ion of key dangerous sec, tion, protection criterion and identification and recording of data disturbanee after the fault, and the corresponding targeted measm^s and suggestions for improvement are put forward.