SU1529174A1 - Multichannel control device - Google Patents

Abstract

The invention relates to power engineering and can be applied to control the neutron power of a water-cooled power reactor (VVER) of a nuclear power plant. The aim of the invention is to increase the static accuracy of the device. The goal is achieved due to the fact that in each control channel the adjustable parameter is compared with the reference signal and the result of the comparison is fed to the input of the three-position relay unit. The output signals of the "More" (or "Less") relay blocks are majorized and act on the regulator through an actuator. In addition, in each control channel, the adjustable parameter is differentiated and, in the presence of a majority signal, it is integrated and fed to the second input of the relay unit. In the absence of a major signal, the output of the differentiator is disconnected from the information input of the integrator and the latter is zeroed. 4 il.

Description

The invention relates to power engineering and can be used to control the neutron power of a water-cooled power reactor (VVER) of a nuclear power plant.

The aim of the invention is to increase the static accuracy of the device.

FIG. 1 shows a block diagram of the device; FIGS. 2 and 3 are block diagrams of the device, reflecting other possible ways of connecting the differentiator while maintaining the same static accuracy; in fig. 4 - timing diagrams illustrating the operation of the device.

The multichannel control device contains sensors 1, setpoints 2, relay control devices 3, error meters 4, relay blocks 5, differentiators 6, keys 7, integrators 8, first and second majority blocks 9 and JO, control block 11, actuator 12 regulatory authority 13 and element OR 14.

FIG. 4 are designated: Uj - output signal of the i-ro block of the device; Ujp is the response voltage of the relay unit 5; 11 total in ($ one signal at the input of the relay unit 5;

Uj is the return voltage of the relay unit 5.

As relay blocks 5, three-position relay blocks are used,

As the majority blocks 9 and 10, blocks with a logic m from n are used, where m 1,2 ... M; nel, 2 ... n

.

The device works as follows.

Consider the operation of the device when p 3 and gp 2,

At the input of the meter 4 mismatch, a signal is formed

) -K) and, (p) - UI (P)),

where and (p) - value-regulated

parameter at the output of sensor 1;

UjiCp) is the specified value of the parameter at the output of master 2;

K is the transfer coefficient of the error meter 4;

and ", (p) is the output signal of the error meter 4. On the output of the differentiator 6, a signal is generated.

ib (p) -Td and, (p),

where TD is the time constant of the differentiator.

At the input of the integrator 8 Firt-shirut- with the signal

) -

where T is the time constant of the integrator 8,

If there is no signal More (or Less) at the output of the majority block 9 (or 10) and the signal at the output of the LII unit 14, the information input of the HHterpaTopa 8 is disconnected from the output di (1) of the fermentation generator 6, and the voltage value at the output of the integrator 8 is zero (Ug O), With this, the value of the adjustable parameter is equal to the preset (figure 4, time interval 0-t

If the parameter deviates from the specified value by an amount exceeding the dead zone of the relay unit 5 (Ucp), the output. The last control signal appears. More (or Less). The operation of only one relay block 5 does not turn on the power supply.

e

Q

five

five

ABOUT

0

five

0

The complementary mechanism 12 and the operation of the element IPI 14. Only after the second relay unit 5 trips in the same direction, the majority block 9 generates a signal arriving at the input of the control unit 11, influences the controlled parameter and, as a result, changes it (FIG. 4 time interval,) The same signal through the element liini 14 connects the output of the differentiator 6 to the information input of the integrator 8 with the help of key 7, the differentiator 6 with its output signal U, depending on the rate of change of the value of the controlled parameter U, leads to a change in the output signal Ug of the integrator 8 in antiphase with the error signal U at the output of the error meter 4, thus delaying the change in the value of the signal U., to which the relay unit 5 responds, When reaching U2; / 4 the value of U is error 1 ) 4 has time to be reduced to zero, i.e., the adjustable parameter returns at time tj (FIG. 4) to the specified value.

In the absence of a signal at the output of the majority block 9 (or 10), the element OR 14 disconnects the information input of the integrator 8 from the output of differentiator 6 and the output signal of the integrator Ug with a constant time T decreases to zero (FIG. 4, time interval tj - tj). The device is ready for further work. The value of the constant time of the integrator's discharge T J is much less than the constant time of charge of Tu ,,

An example of the implementation of the control unit 11, the actuator 12 and the regulating organ 13 may be a nuclear power reactor control system with its own regulators.

Taking into account that neutron power is the primary parameter in the NPP technological process; The proposed device allows one to more accurately maintain the value of the neutroscopic power with respect to a given one, which ensures optimal operation of the AEM equipment, increasing its reliability.

Claims (1)

5 claims A multichannel regulating device, containing in each control channel a serially connected switch and integrator, as well as a sensor and setter, connected by outputs to the first and second inputs of the error meter, connected by an output to the first input of the relay unit, connected to the second input of the integrator, common for all channels control two major block, the inputs of the first of which are connected to the outputs More, the outputs of the second - to the inputs Less relay blocks of all channels I5 529I746 the control, and the outputs to the corresponding inputs of the 11ЛН element and the control unit connected by the output through the actuator to the regulator input, the output of the 11Ш1 element is connected to the control inputs of the keys of all the control channels, in order to detect the static accuracy of the device, a differentiator is connected to each control channel, connected by an input to a sensor output, and an output is connected to a key information input, the reset inputs of integrators of all control channels are connected to the output do element 1shi. ten 15 LI4JI .2 Ij gfuf.3 u CL 7 i M 4 1rig4