RU1815337C - Parameters control technique for turbine hall auxiliary equipment at nuclear plant power unit - Google Patents

Abstract

Usage: heat power for automation of process control. SUMMARY OF THE INVENTION: After issuing a control signal, the parameters of the reference model are identified that associate the values of the adjustable parameter with the position of the executive organ. If the rate of change of the adjustable parameter is greater than the maximum setting or less than the minimum setting, when calculating the control action, the value calculated by the reference model is used. 1 ill.

Description

The invention relates to a power system and can be used in automation of process control.

The proposed control method is based on the construction of the mathematical equivalent of the sensor of the controlled parameter, taking into account the possible drifts of the most characteristic parameters, and the use of its software equivalent instead of the readings of the temporarily failed sensor. This simultaneously allows the control system to remain operational during occasional self-correcting sensor failures and impulse noise and to improve control accuracy.

Consider, as an example of identification of unknown parameters, a deterministic joint identification of the current slope of the flow rate characteristic of the control valve K and the time constant of the actuator T of the level controller.

 For such an object, linearized equations of state can be represented as

I

X-KU + A;

f

ig1,

(1)

te

where X is the adjustable level;

W is the position of the control valve;

U - ± 1, 0 - wide-modulated control signal.

Under the condition of constant perturbation A, after issuing a control action of duration m, the following algorithms for deterministic identification of unknown parameters T and K can be generated

f - gDU1

K (Xi-Xo) DT1

where DF is the observed change in the position of the executive body;

SB SP

with

CA VI

Xo - the value of X before issuing the control action :(

Xi is the steady-state value of X after the issuance of the control action.

In more complex cases of measuring interference and inconsistency of disturbances, these algorithms are supplemented by appropriate averaging algorithms based on the results of estimates at several control intervals.

The drawing shows an example block diagram of a device for implementing the proposed method.

The device comprises a control object 1 (for example, a steam turbine heater), an adjustable parameter sensor 2 (for example, a condensate level in a steam turbine heater), connected via a differentiator 3 to an adjustable parameter output signal converter 4, a regulator 5 connected via an executive organ 6 to the subject of regulation 1, the sensor 7 of the position of the Executive body 6, the reference model 8 of the object of regulation, switch 9,

The input of the switch 9 is connected to the output of the converter 4 of the output signal, and the first and second outputs respectively to the input of the controller 5 and the first input of the reference model 8, the second and third inputs of which are connected respectively to the output of the controller 5 and the sensor 7 of the position of the actuator 6, and the output of the reference model 8 is connected to the input of the controller 5.

The method is carried out as follows.

When adjusting the parameters of the technological object 1, a sensor 2 of the adjustable parameter is generated a signal according to the output parameter of the controlled object and the reliability of the readings of the sensor 2 of the adjustable parameter is monitored: the rate of change of the controlled parameter is continuously measured using a differentiator 3, the rate of change of the controlled parameter is compared with the minimum settings in the converter 4 and to the maximum.

The settings are selected in such a way as to ensure the transmission without distortion of the useful signal from the output of the adjustable parameter sensor 2 and the elimination (smoothing) of pulsed noise in the output signal.

If the rate of change of the adjustable parameter does not exceed the minimum and maximum settings, the signal from the output of the converter 4 through the switch 9 is fed to the controller 5, which

generates a control signal to the executive body 6.

In this case, after issuing the control signal, the parameters of the reference model 8 are identified, linking the values of the adjustable parameter with the position of the actuator: the position value of the actuator b, measured by the sensor 7, and the actuator

0, the signal from the output of controller 5 is fed to the inputs of the reference model 8 and is used to calculate the change in the controlled parameter.

If the rate of change of the adjustable parameter is greater than the maximum setting or less than the minimum rate, when forming the control action, the value calculated by the reference model 8 is used: the signal from the output of the converter 4 switches switch 9, and the first input of the reference model 8 comes from the second output switch 9 signal, allowing the passage of the signal from the output of the reference model 8

5 to the input of the controller 5.

Thus, in the process of regulation, the reliability of the readings of the sensor of the adjustable parameter is evaluated and its reliable readings are used to form the control action, if the readings of the sensor of the adjustable parameter are not reliable, the control action is generated using the value calculated from

5 using a reference model linking the values of an adjustable parameter with the readings of an actuator position sensor.

This ensures high quality control by transmitting without distortion the useful signal, eliminating impulse noise in the output signal and abnormal measurement errors, maintaining operability during episodic

5 self-correcting sensor failures. Formula A method for adjusting the parameters of technological equipment of a power plant of a power unit of a nuclear power plant by

0 measuring the adjustable parameter, determining its speed, monitoring the accuracy of the sensor of the adjustable parameter using a converter and supplying the converted signal through the reference

5, an input model of a controller forming a control action on an executive body, characterized in that. that, in order to improve accuracy, after issuing a control action, the parameters of the reference model that connect the value of the adjustable parameter with the position of the executive body are identified, the change in the controlled parameter is calculated using the reference model and its identified parameters

in case of false readings of the sensor of the controlled parameter, the calculated value of the controlled parameter is used when forming the control action.