A Simulation Modeling Method for Steam Turbine Adjustment and Fast Closing Based on Machine-Network Coupling

Abstract

The invention discloses a turbine control valve switch simulation modeling method based on turbine-grid coupling. Currently, no complete turbine-grid side system coupling model is studied and built to simulate the work characteristics of a steam admission control system of a turbo generator unit control valve when an electrical power system has transient failures. According to the technical scheme, the method mainly comprises the steps that a turbine power signal and a synchronous motor revolving speed signal serve as feedback signals, wherein the turbine power signal is transmitted to a synchronous motor on a grid side, and the revolving signal output by the synchronous motor is used for revolving speed feedback; a turbine DEH control system model and a grid side single machine infinite bus system model are strongly coupled, and a turbine-grid coupling control valve switch simulation model for the transient failures of the electrical power system is built; according to the turbine control valve switch logic, a control logic is built. The turbine control valve switch simulation modeling method is closer to the control valve fast closing action under the practical transient failures of the electrical power system, the simulation accuracy is improved, and the effect of the control valve fast closing technology on protecting the stable operation of a unit is verified.

Description

technical field [0001] The invention relates to the technical field of electric power system simulation modeling, in particular to a simulation modeling method for fast-closing simulation modeling of a steam turbine of a super (super) critical unit based on machine-network coupling in the case of an instantaneous fault in a power grid. Background technique [0002] With the interconnection and gradual expansion of the UHV power grid, the stable operation of the power system is particularly important. In order to ensure the stability of the power system, it is required that the turbine generator can quickly and automatically reduce the output when the power grid fails, and it is also required to quickly restore the output of the unit when the power grid fault disappears. Therefore, when a transient failure occurs in the power system, the quick-closing action of the door adjustment can quickly reduce and then restore the power of the turbo-generator, reduce the imbalance betwe...

AI Technical Summary

Problems solved by technology

However, the parameters are usually simplified in the model, assuming that the generator’s quadrature-axis transient electromotive force and power angle are constant to approximate the influence of the excitation system. Such simplification has a great impact on the accuracy of the simulation results and cannot be simulated well. Actual operation of the grid side

[0006] At present, no research has established a complete coupling model of the steam turbine-grid side system to simulate the operating characteristics of the steam turbine-generator valve intake control system when a transient fault occurs in the power system. The study of door-to-door and quick-off is crucial

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