Boiler main steam temperature control method with frequent fluctuation of AGC load instruction of power grid

Abstract

The invention discloses a boiler main steam temperature control method with frequent fluctuation of an AGC load instruction of a power grid, and belongs to the technical field of boiler main steam temperature control. According to the method, the variation trend of the main steam temperature of a boiler and the difference between the measured value of the main steam temperature of the boiler and the set value of the main steam temperature are comprehensively judged and controlled in advance through a main steam temperature super-differential feedforward control loop; and the desuperheating water jet control logic circuit for preventing the main steam temperature from overshooting is used for working conditions of frequent fluctuation of the AGC load instruction of the power grid, and the main steam temperature is controlled within a set range. According to the method, the main steam temperature regulation quality can be greatly improved, the fluctuation range of the main steam temperature of the boiler is reduced, and the unit efficiency is improved; after using this control scheme, the main steam temperature fluctuation range is reduced by 3-5 DEG C than before; and with the continuous development and maturity of the main steam temperature control technology, the foundation can be laid for improving the safe, stable and efficient economic operation of the unit and achieving the long-term goal of energy-saving optimization.

Description

technical field [0001] The invention belongs to the technical field of boiler main steam temperature control, and in particular relates to a boiler main steam temperature control method with frequently fluctuating grid AGC load commands. Background technique [0002] The main steam temperature is one of the main control parameters of the thermal power unit, and its control effect directly affects the safe and economical operation capability of the unit. The main steam temperature control system is a control system with multiple disturbance sources, among which the frequent changes of the unit AGC (Automatic Generation Control) load command is one of the main factors affecting the main steam temperature. [0003] When the AGC command of the unit changes repeatedly in a small period, for the steam temperature automatic adjustment system, it is equivalent to adding a small period of repeated disturbance to the main steam temperature system of the boiler. For the main steam tem...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is: to provide a boiler main steam temperature control method with frequent fluctuations in the AGC load command of the power grid to solve the problem that the traditional PID cascade control is commonly used in the current main steam temperature control system of thermal power units, which cannot solve the steam temperature fluctuation Big, overheating technical issues

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