Torsional Dynamics of Parallel Turbine Generators with Close Torsional Frequencies
The series compensation and HVDC are widely used in Chinese power grids to increase the transmission capability of long distance lines, which may cause subsynchronous oscillation (SSO).In the power plants, there may be parallel turbine generators with close torsional frequencies as large power plants are built in phases.In this paper, the mechanism and characteristics of torsional dynamics of parallel turbine generators with close torsional frequencies are studied.First, the frequency response characteristic of torsional oscillation is investigated and the results indicate that torsional oscillation is easy to stimulate by the perturbation at shaft torsional natural frequencies.Then the torque coupling relationship between parallel turbine generators with close torsional frequencies is analyzed, by which the mechanism of gen-grid and gen-gen oscillation modes is revealed.On this base, the characteristics of the two modes are analyzed and compared by eigenvalue method, and the torsional dynamics in an actual system is explained reasonably and clearly.The time domain simulation is conducted to demonstrate the correctness of the analysis conclusions.
Close torsional frequencies Gen-Gen Mode Gen-Grid Mode Parallel turbine generator Subsynchronous oscillation (SSO) Torsional dynamics
Peng Zhang Tianshu Bi
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University
国际会议
南京
英文
603-607
2015-09-21（万方平台首次上网日期，不代表论文的发表时间）