Abstract
The methodology of creation of automatic control system (ACS) of water level in the steam generator is developed. The mathematical model of checking its working capacity is developed, which allows establishing the maximum deviations of water level without carrying out full-scale tests, without adjusting the settings of tripping actuation according to the water level in the drum. The foreign methods of PID-regulator adjustment in the cascade system of automatic water level control in the boiler drum are considered, on the basis of which an invariant cascade system of automatic control is proposed. The invariant Cascade-System of Automatic Control (CSAC) of water level in a boiler drum is offered. Simulation results of the invariant cascade-system of automatic control in comparison with CSAC, configured with best foreign method, showed a significant improvement in the quality of regulation in all the major disturbing influences. The results can be used in the development of adaptive control systems and other thermal power devices.
Highlights
Automation of power equipment of power plants is carried out in many directions, with one of the main being the regulation of the water level in the boiler drum
Three-pulse automatic control systems (ACS) of the water level in the drum are most widespread at thermal power plants (TPP) and nuclear power plants (NPP) [1,2,3]
From the compensation condition f2 taking into account the transfer function (17) we find the transfer function of the compensation device
Summary
Automation of power equipment of power plants is carried out in many directions, with one of the main being the regulation of the water level in the boiler drum (steam generator). The quality of regulation of the water level in the drum boilers of thermal power plants (TPP) and of steam generators of nuclear power plants (NPP) largely determine the reliability and efficiency of thermal power plants and nuclear power plants. Three-pulse automatic control systems (ACS) of the water level in the drum are most widespread at TPP and NPP [1,2,3]. The use of classical regulators with a rigid feedback device in these ACS increases the stability of the system, but does not provide quality control of the water level in the boiler drum [4, 5]. A typical three-pulse ACS of the water level in the boiler drum has such disadvantages as: necessity of availability of three measurement sensors (level, superheated steam flow and feed water) the presence of a static control error at the end of the transition process at the internal perturbation, as well as at the external perturbation of the flow rate of superheated steam with the phenomenon of “level swelling” [3]
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