350MW燃气-蒸汽联合循环发电机组轴系扭振的仿真

Simulation of Shaft System Torsional Vibration for 350 MW Gas-Steam Combined Cycle Generator Units

针对东部电厂350 MW燃气-蒸汽联合循环发电机组建立了机网耦合扭振的仿真模型,对短路故障和调峰过程引起的暂态扭矩冲击作用进行了仿真计算。结果表明,在发电机近处发生三相对地短路故障时对轴系有比较严重的暂态扭矩冲击作用,低压汽轮机转子和发电机转子间的暂态扭矩最大,而在日常的调峰过程中,轴系扭矩变化平缓,没有暂态扭矩冲击作用。

In view of 350 MW gas-steam combined cycle generator units for Eastern Power Plant,the simulation model of coupling machine-net torsinal vibration is set up,the simulation calculation is made to the impact action of temporary torsinal moment which is resulted from short circuit fault and peak shaving process.The result indicates when the short circuit fault of three phases to ground happens near the generator,there is the more serious impact action of temporary torsinal moment to shaft system.The temporary torsinal moment within LP turbine rotor and generator rotor is largest.In the general peak shaving process,the torsinal moment changes gently,and is not the impact action of temporary torsinal moment.