Determining method and device of bypass pressure setting value

Abstract

An embodiment of the invention provides a determining method and device of a bypass pressure setting value. The method includes: according to a real-time process variable of a bypass control system, predicting variance trend and rate of main steam pressure of a bypass control system and variance trend and rate of main steam temperature by a prediction algorithm of a state observer; according to the predicted variance trend and rate of the main steam pressure, the predicted variance trend and rate of the main steam temperature, actual operation condition of the bypass control system and bypass operation characteristics, calculating a given function of the bypass pressure setting value; entering the predicted variance trend and rate of the main steam pressure and the predicted variance trend and rate of the main steam temperature into the given function of the bypass pressure setting value, and calculating the bypass pressure setting value. The determining method and device has the advantages that precision of the bypass pressure setting value is improved and the actual condition of a random set of the bypass pressure setting values can also be improved so as to allow adapting.

Description

technical field [0001] The invention relates to the technical field of gas-steam combined cycle units, in particular to a method and device for determining a bypass pressure setting value. Background technique [0002] The steam turbine bypass system plays an important role in improving the start-up performance of the unit, reducing the thermal stress of the steam turbine, improving the load adaptability of the unit and protecting the unit. [0003] The gas-steam combined cycle unit has the characteristics of short start-up preparation time and fast start-stop, etc., and shoulders the heavy responsibility of power grid peak regulation. At this time, the automatic bypass control system is particularly important. With the improvement of thermal automation level in power plants, APS (Automatic Start-Stop Control System) makes the start-up and stop of gas-steam combined cycle units more efficient and convenient, greatly reducing the operating intensity of operators, and the auto...

AI Technical Summary

Problems solved by technology

[0007] The biggest disadvantage of the above bypass control strategy is that the bypass pressure setting value follows the single criterion and lags behind. When the operating conditions of the unit change, the adaptability is poor, and it cannot be adaptively adjusted according to the actual situation of the unit. The bypass pressure setting value is accurate. The temperature is low, which prolongs the start-up rush time of the unit and reduces the operating efficiency of the unit

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