A primary frequency regulation control method for coal-fired units in the turbine following mode

Abstract

The invention discloses a primary frequency modulation control method of a coal-fired unit in a steam turbine following mode, which belongs to the technical field of automatic control of the coal-fired unit and can be used for the automatic control of primary frequency modulation during the actual operation of the coal-fired unit. By adding the primary frequency modulation load pull-back control logic and adopting the closed-loop control method, the set value of the main steam pressure can be dynamically corrected in real time, which can effectively avoid the reverse adjustment of the primary frequency regulation in the steam turbine following mode, and ensure that the primary frequency regulation performance of the unit in this mode is also excellent. Rapidity and accuracy, to meet the grid assessment requirements.

Description

technical field [0001] The invention relates to the technical field of automatic control of a coal-fired unit, in particular to a primary frequency modulation control method for a coal-fired unit in a turbine following mode. Background technique [0002] In recent years, with the large-scale access of new energy power and wind power, the network source structure has become more and more complex. In order to ensure the safety of the power grid, the regional power grids have successively issued "two detailed rules", which clearly require that the coal-fired units connected to the grid must have the function of primary frequency regulation, and the performance of the unit's primary frequency regulation must be strictly assessed. In addition, due to the pressure of environmental protection assessment, in order to increase the access capacity of new energy power, regional power grids encourage coal-fired units to have deep peak-shaving capabilities, and at the same time increase ...

AI Technical Summary

Problems solved by technology

This control method obtains the corresponding relationship between the pressure change and the load change under different main steam pressure conditions through experiments, and corrects the main steam pressure setting value to avoid the reverse adjustment of the primary frequency modulation in the pressure control mode, but this correction It is a static rough correction obtained under test conditions. It is a kind of feedforward open-loop control. To a certain extent, it can avoid the reverse adjustment of the next frequency modulation in the voltage control mode, but it still cannot achieve the control accuracy of the next frequency modulation in the coordination mode.

And when it is actually put into use, the actual working conditions are not necessarily the same as the test working conditions, so that there is a certain deviation between the static parameters obtained in the test and the actual control

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