Simulation and Analysis of Power Oscillation of Secondary Reheat Unit Considering the Characteristics of the Valve

The power oscillation has a bad impact on the safety and economy of power plants and power grids, and the causes and solutions of the power oscillation problem of secondary reheat units are not mature. In order to quickly solve the power oscillation problem of the secondary reheat unit, a simulation and analysis method of the power oscillation of the secondary reheat unit considering the characteristics of the valve adjustment was proposed. By analyzing the influence of operating parameters and adjusting parameters on the characteristics of the valve, the modular modeling of the secondary reheat unit is carried out, and the power model considering the secondary reheating process and the actuator model considering the adjusting characteristics of the valve are proposed, then the optimized adjusting parameters are proposed based on this. The simulation analysis was carried out with reference to the actual power oscillation case, which verified the correctness of the theoretical analysis and the effectiveness of the proposed method are provided an effective decision-making reference for the cause finding of the power oscillation of the secondary reheat unit.