Online evaluating method and device for primary frequency modulation capacity of turbine

Abstract

The invention discloses an online evaluating method for the primary frequency modulation capacity of a turbine.The method includes the steps of obtaining the current main steam pressure of a running unit of the turbine and the current opening degree of an adjusting valve in real time; calculating the primary frequency modulation capacity under the rated main steam pressure corresponding to the current opening degree of the adjusting valve according to the relation between the adjusting valve opening degree under the rated main steam pressure of the unit of the turbine and the corresponding primary frequency modulation capacity, wherein the primary frequency modulation capacity is the load increment corresponding to the full opening degree of the adjusting valve; modifying the primary frequency modulation capacity under the rated main steam pressure into the primary frequency modulation capacity corresponding to the current main steam pressure according to the relation between the main steam pressure and the primary frequency modulation capacity, and determining the current primary frequency modulation capacity.By means of the method, the running economy and safety of a power grid are improved.The invention further discloses an online evaluating device for the primary frequency modulation capacity of the turbine.

Description

technical field [0001] The invention relates to the technical field of steam turbine operation control, and more specifically, relates to an online evaluation method for the primary frequency regulation capability of a steam turbine, and also relates to an online evaluation device for the primary frequency regulation capability of a steam turbine. Background technique [0002] At present, large-capacity UHV transmission lines have been implemented one by one in my country, which has effectively promoted the national energy interconnection. However, if transmission failures such as DC transmission blockage occur, for power input provinces, the local power shortage will suddenly increase significantly. The frequency will drop off abruptly. At this time, if the primary frequency regulation function of the thermal power unit works as designed, it will reduce the frequency drop of the grid and reduce the impact of the accident. Therefore, it is very important to accurately grasp t...

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Problems solved by technology

[0005] In view of this, the first object of the present invention is to provide an online evaluation method for the primary frequency regulation capability of a steam turbine, which can effectively solve the problem of poor grid operation security caused by the primary frequency regulation capability deviating from the design value. The second purpose is to provide an online evaluation device for the primary frequency regulation capability of steam turbines

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