Realization method for heat-engine plant speed regulating system model in power system simulation

Abstract

The invention provides a realization method for a heat-engine plant speed regulating system model in power system simulation, wherein, not only a coordinated control system of a boiler and a steam turbine is simulated, but also a speed regulation control system of the stem turbine is simulated. A coordinated control system model comprises a realization method of the primary frequency control, the steam turbine master control, the boiler master control and the feedforward control. A model of the speed regulation control system of the steam turbine comprises a realization method of the primary frequency regulation and a valve actuator model. The realization method can correctly simulate the primary frequency regulation function of the heat-engine plant, realize different configuration ways of speed regulation control, in addition, the method can be applied to a boiler model and an automatic power generation control model and meet the requirements of the electromechanical transient state and medium-term and long-term dynamic simulation of the power system on dynamic system simulation of the heat-engine plant.

Description

technical field [0001] The invention relates to a simulation and calculation of a power system, in particular to a method for realizing a speed regulation system model of a thermal power plant in power system simulation. Background technique [0002] The digital simulation of power system has become the main tool for power system planning, design, operation and analysis. Models and parameters are important determinants of the accuracy of simulation results and directly affect the decision-making scheme based on them. In recent years, the accuracy of frequency response in power system stability simulation has attracted widespread attention from domestic and foreign power grid dispatching and research departments. The analysis of accidents related to power and frequency shows that due to the inaccurate model and parameters of the unit speed control system used in the current simulation, there is a large difference between the frequency response process in the stability simula...

AI Technical Summary

Problems solved by technology

However, the units in actual operation have a variety of control methods, and most units adopt the coordinated control method instead of the BF adjustment method, so the scope of application of the model is limited

[0016] 2) Does not reflect the coordinated control system model of the unit

Therefore, the existing model is not comprehensive and cannot reflect the dynamic characteristics of the speed control system of the unit

[0018] 3) It cannot correctly reflect the primary frequency modulation characteristics of the unit

However, the existing model can only be set in DEH. Therefore, it cannot correctly reflect the primary frequency regulation characteristics of all units, which will lead to deviations in grid frequency calculation.

[0020] 4) Does not consider the interface with the whole process simulation of electromechanical transient medium and long-term dynamics

[0021] In the medium and long-term dynamic simulation, the main steam pressure of the boiler is no longer constant, so the boiler and its control system model need to be considered, but the existing model has no interface with the boiler and its control system model

In addition, for existing thermal power units that adopt a coordinated control system, if the unit participates in automatic generation control (AGC), the interface is in the coordinated control system, so the existing speed regulation system model cannot be compared with that of a thermal power unit that adopts a coordinated control system. AGC model for interface

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