CN207704288U - A kind of main vapour pair PID controller parameter selection system - Google Patents

Abstract

A kind of main vapour secondary controller parameter selection system of the utility model, including temperature sensor, main PID assignment module, subtracter SUM1 modules, low temperature control logic module AND1, high-temperature control logic module AND2, high temperature comparison module HISELECT, low temperature comparison module LOSELECT.A kind of main vapour pair PID controller parameter described in the utility model selects system, by for main PID controller setting value, Stream temperature degree measured value is used as from the difference of main PID controller setting value by thermal module different in temperature selecting unit to the input value of secondary controller, it improves Stream temperature degree and controls to adjust quality, the whole input of Stream temperature degree automatic adjustment in the case of variable working condition is realized, and keeps excellent regulation quality in self-regulating process.

Description

A kind of main vapour pair PID controller parameter selection system

Technical field

The present invention relates to a kind of a kind of main vapour pair PID controller parameters of heat power station to select system.

Background technology

Stream temperature degree is one of main control parameters of fired power generating unit, its control effect directly affects the peace of unit Entirely, economical operation ability.Fired power generating unit Stream temperature degree control system generally uses traditional PID serials controls, this control at present Although scheme field adjustable processed is simple, the variable element of Stream temperature degree control system, the spy of big inertia, large dead time are not adapted to Property, automatic Control Quality is good when this causes Stream temperature degree automatic control system generally existing load steady, but load variations, During opening/stopping coal pulverizer etc., the fluctuation of Stream temperature degree is big, or even cannot put into automatically, and operations staff's labor intensity is caused to increase, Unit output and safety and economic benefit reduce.

At present the general PID control scheme of Stream temperature degree be bunch grade adjustment circuit, however its control during there are fatal The problem of：

When Stream temperature degree is higher than alarming value, due to increasing water spray so that the temperature after attemperator is greatly reduced, it is possible to Leading to cascade control system, there is a phenomenon where progressively close off pitch instruction so that Stream temperature degree can not decline for a long time, cause Overheating problem frequently occurs;

When Stream temperature degree is less than alarming value, due to reducing water spray so that the temperature after attemperator rises rapidly, it is possible to Cause cascade control system to be gradually opened pitch instruction, spray desuperheating phenomenon occurs so that on the Stream temperature degree some time It rises less than setting value, seriously affects safety and the economy of unit, main steam band water is likely to result in when serious.

Generate the above problem the setting value for having its source in secondary controller PID, under certain conditions due to attemperator after High temperature significantly change causes control to occur demodulating.

Invention content

In order to solve the above technical problems, the present invention proposes that a kind of main vapour pair PID controller parameter selects system.

A kind of main vapour pair PID controller parameter selection system, including temperature sensor, main PID assignment module, subtracter SUM1 modules, low temperature control logic module AND1, high-temperature control logic module AND2, high temperature comparison module HISELECT, low temperature Comparison module LOSELECT, HIGHMON2 thermal module, LOWMON1 thermal modules and LOWMON2 modules, main PID controller, pair PID controller, wherein temperature sensor are arranged in main vapour output end, and temperature sensor is connected to main PID assignment module to be subtracted The output of musical instruments used in a Buddhist or Taoist mass SUM1 modules, subtracter is separately connected HIGHMON2 thermal modules, LOWMON1 thermal modules and LOWMON2 moulds Block, the wherein output of LOWMON1 thermal modules and LOWMON2 modules are connected to OR3 modules by AND1 modules, pass through OR3 moulds Block is connected with output handover module, and HIGHMON2 thermal modules are connected by AND2 modules with output handover module, the output The input of handover module is connected with the output of main PID controller, and output is connected to the input terminal of secondary controller.

Preferably, the output handover module include the TRANSFER2 modules being sequentially connected, TRANSFER3 modules, RUNAVERAGE modules, TRANSFER4 modules, TRANSFER5 modules, TRANSFER2 modules are connected to main PID controller output End, the wherein output of OR3 modules are connected with TRANSFER3 modules, and AND1 modules are additionally provided with output all the way and are connected to TRANSFER4 In module, the output of AND2 connects in grade to TRANSFER5 modules.

Further, 3 DEG C of the HIGHMON2 modules set temperature, LOWMON1 modules be -3 DEG C, LOWMON2 modules be - 8℃。

Main vapour pair PID controller parameter described in the utility model selects system, will by for main PID controller setting value Stream temperature degree measured value is used as pair from the difference of main PID controller setting value by thermal module different in temperature selecting unit The input value of adjuster improves Stream temperature degree and controls to adjust quality, realizes the Stream temperature degree in the case of variable working condition and adjusts automatically The whole input of section, and excellent regulation quality is kept in self-regulating process.

Description of the drawings

Fig. 1 is the overall structure figure of embodiment 1.

Specific implementation mode

Embodiment 1

A kind of main vapour pair PID controller parameter described in the utility model selects system, including temperature sensor, main PID to assign It is worth module, subtracter SUM1 modules, low temperature control logic module AND1, high-temperature control logic module AND2, high temperature comparison module HISELECT, low temperature comparison module LOSELECT, HIGHMON2 thermal module, LOWMON1 thermal modules and LOWMON2 modules, Wherein temperature sensor setting is connected to subtracter SUM1 moulds in main vapour output end, temperature sensor with main PID assignment module The output of block, subtracter is separately connected HIGHMON2 thermal modules, LOWMON1 thermal modules and LOWMON2 modules, wherein The output of LOWMON1 thermal modules and LOWMON2 modules is connected to OR3 modules by AND1 modules, passes through OR3 modules and output Handover module is connected, and HIGHMON2 thermal modules are connected by AND2 modules with output handover module, the output handover module Input be connected with the output of main PID controller, output is connected to the input terminal of secondary controller.

The output handover module includes the TRANSFER2 modules, TRANSFER3 modules, RUNAVERAGE being sequentially connected Module, TRANSFER4 modules, TRANSFER5 modules, TRANSFER2 modules are connected to main PID controller output end, wherein OR3 The output of module is connected with TRANSFER3 modules, and AND1 modules are additionally provided with output all the way and are connected in TRANSFER4 modules, The output of AND2 connects in grade to TRANSFER5 modules.

3 DEG C of the HIGHMON2 modules set temperature, LOWMON1 modules are -3 DEG C, LOWMON2 modules are -8 DEG C.

When Stream temperature degree measured value and main PID controller setting value are in the block poor at 3 DEG C to -3 DEG C in subtracter SUM1 moulds Between when, AND1 modules and AND2 modules do not trigger, and OR3 modules negate, Stream temperature degree normal regulating, TRANSFER2 modules, The roads Y of TRANSFER3 modules are connected, and after being averaged by RUNAVERAGE modules, pass through TRANSFER4 modules, TRANSFER5 moulds The roads N of block export, setting value of the main PID controller output valve as secondary PID regulator.

When main PID controller output valve is subtracted each other with main PID controller setting value in subtracter SUM1 modules, value is higher than When 3 DEG C of setting value, after the output valve of two level attemperator increases by 2 DEG C, taken in LOSELECT modules with main PID controller output valve Greatly, HIGHMON2 modules trigger, and when Stream temperature degree is adjusted to auto state, AND2 is triggered, and the roads TRANSFER5 module Y are defeated Go out, as the setting value of secondary PID regulator, by the integral action of secondary PID controller, persistently opens pitch to reduce Stream temperature Degree, to ensure that the correct direction of control.

When Stream temperature degree measured value and main PID controller setting value are less than -3 DEG C or less in subtracter SUM1 moulds difference in the block When, compared with main PID controller output valve reduces the temperature after 2 DEG C in LOSELECT modules with two level attemperator, get the small value, when When measured value is less than -3 DEG C of setting value, the triggering of LOWMON1 modules, when Stream temperature degree is adjusted to auto state, AND1 modules are touched Hair, exports from the roads Y of TRANSFER4 modules, TRANSFER5 modules to secondary PID controller, the setting as secondary PID controller Value, controls that pitch is continuously off to improve Stream temperature degree by secondary PID controller, to ensure that the correct direction of control.

When Stream temperature degree measured value is less than -8 DEG C of setting value or less, LOWMON1 modules, the triggering of LOWMON2 module synchronizations, OR1 modules are connected, and are exported from AND1 modules to the roads Y of TRANSFER4 modules, from the roads Y of TRANSFER4 modules, TRANSFER5 Module is exported to secondary PID controller, by secondary PID controller, forces control pitch instruction quickly to be lowered, until pitch closes completely It closes, ensure that the correct direction of control, improve the rapidity of pitch action.

RUNAVERAGE modules are the average value output after inputting one minute, it is therefore an objective to during Three models switch Avoid output valve that saltus step occurs.

Claims (3)

1. a kind of main vapour pair PID controller parameter selects system, it is characterised in that：Including temperature sensor, main PID assignment mould Block, subtracter SUM1 modules, low temperature control logic module AND1, high-temperature control logic module AND2, high temperature comparison module HISELECT, low temperature comparison module LOSELECT, HIGHMON2 thermal module, LOWMON1 thermal modules and LOWMON2 modules, Wherein temperature sensor setting is connected to subtracter SUM1 moulds in main vapour output end, temperature sensor with main PID assignment module The output of block, subtracter is separately connected HIGHMON2 thermal modules, LOWMON1 thermal modules and LOWMON2 modules, wherein The output of LOWMON1 thermal modules and LOWMON2 modules is connected to OR3 modules by AND1 modules, passes through OR3 modules and output Handover module is connected, and HIGHMON2 thermal modules are connected by AND2 modules with output handover module, the output handover module Input be connected with the output of main PID controller, output is connected to the input terminal of secondary controller.

2. a kind of main vapour pair PID controller parameter selects system as described in claim 1, it is characterised in that：The output switching Module include the TRANSFER2 modules being sequentially connected, TRANSFER3 modules, RUNAVERAGE modules, TRANSFER4 modules, TRANSFER5 modules, TRANSFER2 modules are connected to main PID controller output end, wherein the output of OR3 modules with TRANSFER3 modules are connected, and AND1 modules are additionally provided with output all the way and are connected in TRANSFER4 modules, and the output of AND2 connects grade To TRANSFER5 modules.

3. a kind of main vapour pair PID controller parameter selects system as described in claim 1, it is characterised in that：The HIGHMON2 3 DEG C of thermal module set temperature, LOWMON1 modules are -3 DEG C, LOWMON2 modules are -8 DEG C.