SU840424A1 - Power unit automatic control system - Google Patents

Description

(54) AUTOMATIC REGULATED POWER UNIT SYSTEM

The invention relates to a power system and can be used in the automation of power units with direct-flow boilers. The systems of automatic control of the power unit are known, which contain a mode parameter controller with a reference for this parameter and sensors for the working medium parameter and the position of turbine control valves connected to the boiler capacity controller and dynamic converter 1. However, these systems do not provide high quality environment. Closest to the proposed technical essence and the achieved result is the automatic control system of the power unit, which contains a mode parameter controller with a sensor and a setpoint device, connected to the boiler capacity controller, a working medium parameter controller with its sensor and setter, connected to an intermediate controller, the first dynamic converter, the input of which is connected to the sensor of the working medium parameter, and the output - with the regulator of the mode parameter, and the second dynamic the converter, the input of which is connected to the setting unit of the mode parameter, and the output - to the intermediate controller. When the mode parameter (power unit capacity) deviates from the set value, the impact is applied to the boiler capacity regulator, and simultaneously the setpoint signal of this parameter through the dynamic converter (differentiator) acts on the intermediate regulator to prevent significant changes in the working medium parameter (vapor pressure before the turbine} 2. A disadvantage of the known system is the reduced quality of the control process. The purpose of the invention is to improve the quality of the control process. Lena goal is achieved by the fact that the setpoint parameter of the working medium is additionally connected to the input of the first dynamic converter and connected to the input of the second dynamic converter with the setting point of the mode parameter via the mode parameter regulator .In Fig. The system diagram is shown where the vapor parameter is steam pressure , in front of the turbine, in Fig. 2 is the same, where the mode parameter is the power of the power unit. The system contains regulator 1 of the mode parameter with the setting unit 2 and the sensor 3. As the mode a variable parameter, the vapor pressure upstream of the turbine can be chosen (as in scheme n, power unit modality (as in the diagram in FIG. 2) or another similar parameter. The output of the regulator 1 is connected to the input of the regulator 4 of the boiler capacity, for example, to the input of the fuel regulator or the power regulator. The system also includes a regulator 5 of the working medium parameter with a setting device 6 and a sensor 7. As a parameter, this parameter can be taken, for example, pressure or temperature-medium in the intermediate section of the boiler channel or another parameter of the working medium. . The output of the controller 5 is connected to the intermediate controller 8, in ca. which may be a power regulator or a fuel regulator. The performance regulator 4 is equipped with a flow sensor 9 and a regulator 10, a regulator 8 - a flow sensor 11 and a regulator 1 The setting parameter 6 and 7 of the working medium parameter through the first dynamic converter 13 are connected to the regulators 1 of the mode parameter The output of this regulator 1 through the second the dynamic converter 14 is connected to the controller 8. In the case of the execution of the controller 1 mode. parameter in the form of a power unit power regulator (Fig. 2), a steam pressure sensor 16 upstream of the turbine can be connected to its input via differentiator 15. o The transfer function of the second dynamic transducer 14 should be selected as the ratio of the transfer function of the signal according to the mode Parameter when disturbed by the regulator 12 to the transfer ratio of the function at the same disturbance according to the signal about the working medium parameter. The system works as follows. When changing the mode parameter, for example, the vapor pressure before the turbine, the controller 1, acting on the controller 4 and through the dynamic converter 14 to the controller 8, changes the fuel consumption of the absorption water into the boiler. The inevitable divergence of the response signal of the sensor 7, which characterizes the state of the medium. in the intermediate section of the boiler path, to changes in the fuel and feedwater flow rates leads to the inclusion of the regulator 5 and to an additional change in the position of the regulator 12 of the fuel regulator 8 (or power supply). This change leads to a deviation of the mode parameter, for example, the vapor pressure in front of the turbine and in the absence of the first dynamic transducer 13 leads to a new turning on of the regulator 1, which in turn changes the consumption of fuel and feed water, etc. However, the introduction of the first dynamic converter 13 leads to the fact that the deviation of the vapor pressure in front of the turbine as a result of the movement of the regulator 12 is compensated by the deviation of the working medium parameter converted by the dynamic converter 13, as a result of which the regulator 1 practically does not enter operation. As a parameter of the working medium, the temperature, enthalpy, density of the medium, a combination of one of the above signals with the Transform through the integrating-differentiating element by vapor pressure (at the same point of the path as the main impulse, or before turbine), signal, characterization of water consumption for the first controlled injection, and t, p. The maintenance of the working environment parameter can be performed according to the scheme with a high-speed signal, including a controller, to the input of which the setting device 6 and the sensor 7 of the working environment parameter are connected, and through the actual differentiating element the feedwater (or fuel) flow sensor 1I and output signal dynamic converter. As a result of the application of my system, the maintenance of regime and technological parameters of the boiler and the power plant as a whole is significantly improved. Formula of the invention The system of automatic control of the power unit, containing a mode parameter controller with a sensor and a setpoint device, connected to the boiler capacity controller, a working medium parameter controller with its own sensor and setting unit, connected to an intermediate controller, the first dynamic converter whose input is connected with sensor working environment

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Phage 1 and the output are with the mode parameter controller, and the second dynamic converter, the input of which is connected to the mode parameter setting unit, and the output with the intermediate controller, which differs from that. that in order to improve the quality of the adjustment process, the setpoint parameter of the working medium is additionally connected to the input of the first dynamic converter, and the connection of the input of the second dynamic converter to the sensor of the mode parameter is made through the mode parameter controller. Sources of information taken into account in the examination 1. USSR author's certificate number 322501, cl. F 01 K 7/24, 1970. 2. USSR author's certificate No. 434178, kp. F O K 7/24, 1971.

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Claims (1)

Claim Power unit automatic control system ', containing a mode parameter regulator with a sensor and a setter connected to a boiler performance regulator, a medium parameter controller with its own sensor and setter, connected to an intermediate regulator, the first dynamic converter, the input of which is connected to a medium parameter 840424 6 and the output is with a mode parameter regulator, and the second dynamic converter, the input of which is connected to the mode parameter setter, and the output is with an intermediate regulator, characterized in that in order to improve the quality of the regulation process, the working medium parameter setter is additionally connected to the input of the first dynamic transducer, and the connection of the input of the second dynamic transducer with the mode parameter sensor is made through the mode parameter regulator.