A method for state-space steam temperature control of utility boilers

Abstract

The invention discloses a steam temperature control method in the state space of a power plant boiler, which relates to the technical field of automatic control of steam temperature. Different PID control types can be selected according to the differences in the on-site unit control DCS system, and the state space is used to control the steam temperature and parameter setting automatically. Optimizing, selecting optimized control indicators, optimizing control parameters, testing and optimizing the entire control system, and quickly realizing optimal control of steam temperature. The invention improves the long-term average steam temperature value of the generator set, and the minimum steam temperature control can be increased by more than 10°C; and reduces the coal consumption rate of the generator set by 1.20g / kw.h; the invention can keep the power station boiler in an automatic control state, The labor intensity of the operating personnel is greatly reduced; the small change of the superheated steam temperature improves the safe operation rate of the unit and prolongs the service life of the equipment.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a method for controlling steam temperature in a state space of a power plant boiler. Background technique [0002] Most of the automatic control systems of thermal power units are implemented by conventional classical control theory, and it is difficult to achieve ideal control effects for complex control loop systems. At present, the superheated steam temperature and reheated steam temperature control of power plant boilers almost all adopt the conventional cascade control system, and the steam temperature controlled objects of many units have a large lag, and the water injection valve has serious nonlinearity. When the unit load (steam flow) changes, the steam temperature deviates from the set value by more than 8-10°C, and the over-temperature is very frequent. The main and reheat steam temperature is an important parameter in the thermal system of the unit, and the...

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Problems solved by technology

[0002] Most of the automatic control systems of thermal power units are realized by conventional classical control theory, and it is difficult to achieve ideal control effects for complex control loop systems

At present, the superheated steam temperature and reheated steam temperature control of power plant boilers almost all adopt the conventional cascade control system, and the steam temperature of many units has a large lag of the controlled object, and the water injection valve has serious nonlinearity

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