SU1399824A1 - Method of stabilizing the position of plasma cord in tocamak reactor - Google Patents

Abstract

The invention relates to the automatic control of processes in thermo-nuclear installations and can be used in systems for controlling the equilibrium position of a plasma cord over a large radius in installations tokamak. The aim of the invention is to improve the accuracy of the stabilization of the position of the plasma cord in the tokamak. Uncontrolled disturbance 2 acts on the control object I, which is a plasma cord in a tokamak. The control field creates an actuator 3 consisting of control winding 4 and a correction-to-voltage converter 5 on this winding. The offset of the plasma cord and the current in the control winding are measured using measuring units 6 and 7. The model values of displacement and disturbances and their time derivatives are formed by the model 8 of the motion of the plasma pinn and the model 9 of disturbance. The output of the correction signal generating unit 11 is connected to the input of the actuator 3. By using the adaptation blocks 12-17, the parameters are adjusted with $ (L

Description

one

The invention relates to automatic process control in thermo-nuclear installations and can be used in systems for controlling the equilibrium position of a plasma cord over a large radius in tokamak-type thermo-nuclear installations.

The purpose of the invention is to improve the accuracy of the stabilization of the position of the plasma cord in the tokamak.

The method consists in that the parameters of the plasma cord motion model — the transmission coefficient or constant time — automatically adjust to the object's parameters — the plasma cord in the tokamak — during the entire discharge time. This provides a more accurate estimate of the uncontrolled disturbance and, thus, a more accurate compensation of the disturbance during the formation of the correction signal. Increasing the accuracy of compensation of disturbances leads to a further decrease in the magnitude of the static error in the displacement of the plasma column.

Adaptive approximation of the parameters of the plasma string motion model K T T to the parameters of the cord K, T itself minimizes the dynamic tracking error by the model bias values X and the WM disturbance of the measured bias value X and the uncontrollable value of the disturbance W

The drawing shows a structural diagram of a device that implements a method for stabilizing the position of a plasma cord in a tokamak.

The control object 1, which is a plasma cord in the tokamak, is affected by an uncontrolled disturbance 2 caused by a mismatch of the magnetic field required to balance the plasma cord and the magnetic field created by the external magnetic field.

them windings poloidal fields. A control field proportional to the current in control winding 1, creates an actuator 3. This device consists of a serial connection of control winding A and converter 5 of the correction signal Z to a voltage on winding U. When generating high power, the converter is relay and has a high Efficiency The offset X and the control current I, are measured using the corresponding measuring units 6 and 7. The model offset values X | and perturbations W and their temporary

0

five

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five

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derivatives

dxy dw

form5

dt dt

with model 8 plasma slug movement and model 9 perturbation. Comparison unit 10 generates a difference signal by comparing the magnitude of the measured displacement X and its model value X. The output of the correction signal generating unit 11 is connected to the input of the actuator 3.

The quality adaptation criterion forming unit 12 for determining the magnitude of the deviation of the coefficient K of model 8 from the coefficient K of object 1 is connected by two inputs to the outputs of object X and the plasma cord X motion model, and the input through filter 13 and integrator 1A to the first parametric input of model 8. Block

Forming the adaptation quality criterion to determine the magnitude of the deviation of the constant time T of the Model 8 from the constant time T of the object 1 is connected by two inputs to the output of the model 9 of the perturbation W and the current meter 1у 7, and the output through the filter

16 and integrator 17 - to the second parametric input of model 8.

The adaptation quality criterion shaping unit 12 determines the difference of the modules 1X1 - | Hm1, which is filtered by filter 13 and fed to the input of the integrator 14. . | X1. This corresponds to the equality К К, When changing К, this adaptation contour ensures the tracking of the value K for the changing value K.

The unit for forming the criterion adaptation determines the value of the product lyW, which is filtered by the filter 16 and fed to the input of the integrator 17. The output signal of the adaptation of the integrator 17 affects the value of T ", changing it in such a direction that the average value of the product tends to zero . The equality to zero of this product ensures the equality of the constant time T, T. When T changes, this adaptation circuit monitors the value of T "for the variable T. The maximum possible stabilization accuracy manifests itself in the complete elimination of the static error in the displacement of the plasma cord during total discharge in tokamak.

Claims (3)

1. A method for stabilizing the position of a plasma cord in a tokamak, including changing the control magnetic field, perpendicular to the plane of the plasma cord, in accordance with the magnitude of the correction signal generated by the motion model of the plasma cord and the perturbation model, by adding signals proportional to the measured displacement of the plasma cord of the cord and the model of the time derivatives of displacement and perturbation, which is characterized by the fact that 5 5 0 five 0 five To improve the accuracy of stabilizing the position of the plasma cord in the tokamak, an adaptation signal is generated by separating from signals proportional to the displacement, the control magnetic field, the model values of displacement and disturbance, the signal of the adaptation quality criterion characterizing the magnitude and sign of the deviation of one of the following parameters of the plasma cord motion : transmission coefficient or constant time, from the corresponding parameters of the plasma cord, and further filtering and integrating the signal criterion and adaptation qualities, continuously change the indicated parameters of the plasma-cord motion model in proportion to the formed adaptation signal in the direction of reducing the variation of the parameters of the plasma-cord motion model until the minimum value of this deviation is reached. 2. Method POP.1, which differs from the fact that the signal of the adaptation quality criteria is formed as a signal of the difference between the modules of the measured and model values of the displacement of the plasma cord. 3. Method POP1, which is different in that the signal of the adaptation quality criteria is formed by extracting the average values of the signal proportional to the control magnetic field and the signal proportional to the model value of the disturbance, then determining the signal of the difference between the signal proportional to the control magnetic field, and its average value, and the difference signal between the model value of the perturbation and its average value, and the subsequent multiplication of the received difference signals, the reciprocal constant value webbings motion model of the plasma column is varied in proportion to the adaptation signal.