Abstract
Through the analysis of the control theory for steam turbine, the transfer function of the steam turbine control modes in the parallel operation was obtained. The frequency domain analysis indicated that different control modes of turbine control system have different influence on the damping characteristics of the power system. The comparative analysis shows the direction and the degree of the influence under the different oscillation frequency range. This can provide the theory for the suppression of the low-frequency oscillation from turbine side and has a guiding significance for the stability of power system. The results of simulation tests are consistent with the theoretic analysis.
Highlights
In recent years, with the increase in power demand, the size of power system has improved and the transmission power in main lines is increasing
The steam turbine control system provides negative damping to the grid when the oscillation frequency is higher than the boundary frequency and provides positive damping to the grid when the oscillation frequency is lower than the boundary frequency
The influences of turbine control system on power system are different in different control modes
Summary
With the increase in power demand, the size of power system has improved and the transmission power in main lines is increasing.
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