In the present power system stability analysis, BPA model for turbine and governor is commonly used. It simplifies the actual turbine system to a large extent, therefore the model simulation results may deviate from the actual conditions. In order to improve the actual data simulation accuracy, this paper compared the real and simulation data of power, high pressure cylinder (HPC) exhaust pressure and reheat pressure. Then calibrated and optimized the established model using the data of field operation. Meanwhile, the model modified method using actual data is given and guidance of parameters tests is offered.

With the rapid development of China's interconnected power grid, power system operation environment has become increasingly complex. The safety and stability of the power system requirements are also increasing. Turbine is an important basis for the analysis of power system stability. This paper studied the influence of turbine parameters related to network on the stability of the grid from the perspective of the frequency domain, and obtained the impact properties of turbine speed control system parameters related to different oscillation frequency of the power system. The conclusions are validated from time domain. So that when analyzing the stability of the power system, a more targeted turbine model according to different research purposes can be chosen because the parameters’ importance can show the necessity of the modules.

This article analysed the impact of speed regulation and power-frequency control on power system low-frequency oscillations from the perspective of its production theory. From the experimental results, it can be seen that the power-frequency control will make the low-frequency oscillations worse and longer, thus need to be modified in further research.

The liquid-solid fluidization bed is an effective method for removing hard ions from water. However, it is widely believed that the flow in the liquid-solid fluidization bed is homogeneous, which limits the transfer rates of heat, mass, momentum, and mixing. In this study, the results of the computational fluid dynamics (CFD) method showed significant heterogeneous particle–fluid patterns in the liquid-solid fluidization bed. On the other hand, simulations of the hydrodynamics behavior in the liquid-solid fluidized bed were first performed using different solid particle sizes, then particle classification, velocity distribution, and the vortical structures in the liquid-solid fluidized bed were assessed. In addition, a new model was proposed in this study to predict the flow behavior of the fluid-particle system used. The obtained results demonstrated the presence of the heterogeneous flow regime in the liquid-solid fluidized bed. The developed model for the onset of heterogeneous fluidization behavior revealed reasonable prediction results. Therefore, this model can be applied in future related studies on the hydrodynamics of the liquid-solid fluidized bed.

This article introduces the definition of delay rate in turbine electro-hydraulic control system and its significance in practical applications, and builds the simulation model to measure it. By introducing and analyzing the principal of current domestic delay rate measuring method that uses uplink and downlink ramp signal, it can be found that this kind of determination is affected by the speed largely, and simulation experiments show its validity. Aiming at solving problems of this method, a measuring method of static delay rate based on the frequency step disturbance has been put forward and simulated.