CN207146353U - A kind of Stream temperature degree regulating system - Google Patents
A kind of Stream temperature degree regulating system Download PDFInfo
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- CN207146353U CN207146353U CN201720456178.6U CN201720456178U CN207146353U CN 207146353 U CN207146353 U CN 207146353U CN 201720456178 U CN201720456178 U CN 201720456178U CN 207146353 U CN207146353 U CN 207146353U
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Abstract
It the utility model is related to a kind of heat power station Stream temperature degree control system, a kind of Stream temperature degree regulating system, it is characterised in that the system includes：Subtracter SUM1, Stream temperature degree measured value and main PID controller design temperature are asked poor；First temperature selecting unit, including several thermal modules, set different temperature limits respectively, and the output valve of subtracter SUM1 modules selects its corresponding thermal module output in temperature selecting unit.The utility model proposes a kind of Stream temperature degree regulating system that can lift Stream temperature degree regulation quality, by setting main PID controller setting value, Stream temperature degree measured value is adjusted from the difference of main PID controller setting value by thermal module different in temperature selecting unit, improve Stream temperature degree and control to adjust quality, realize the Stream temperature degree in the case of variable working condition and automatically adjust whole input, and excellent regulation quality is kept in self-regulating process.
Description
Technical field
The present invention relates to a kind of heat power station Stream temperature degree control system.
Background technology
Stream temperature degree is one of main control parameters of fired power generating unit, and 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, big inertia, the spy of large dead time of Stream temperature degree control system 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 can not put into automatically, causes the increase of operations staff's labor intensity,
Unit output and safety and economic benefit reduce.
Stream temperature degree system has large delay, big inertial properties, it is difficult to controls, slightly controls bad, will produce bigger
Overshoot.The principal element for influenceing Stream temperature degree has：Main steam flow, main steam pressure, boiler combustion situation：Including total coal
Amount, total blast volume, coal pulverizer operation combination, tilting angle of burner, First air, Secondary Air and burnt wind etc., appoint in these influence factors
What changes on one side, may all cause the change of combustion centre, so as to influence the distribution of fire box temperature field so that main vapour
High temperature changes.
Stream temperature degree automatically controls finds that mostly control effect is undesirable by investigation, even very poor in the thermal power plant having,
Some long-times are not thrown automatically, even if having put into for having is automatic, automatic Control Quality also can not meet requirement.Stream temperature degree control
The optimization of system processed, it is the direction of thermal technology's automatic technique research.With the aggravation that power industry competes, in safety, economic benefit
Aspect obtains the especially Stream temperature degree optimization of positive effect, versatile, the convenient optimal control special-purpose software of installation and debugging will
Further development and application can be obtained in power plant.
At present, although there is much Advanced Control Techniques on Stream temperature degree, such as Predicting Technique, fuzzy technology, nerve
Network technology etc., but above-mentioned technology lays particular stress on theoretical property, and academic article is more, and based on simulating, verifying, engineering site application is poor, has
Strong for case although having field application example a bit, promotion and popularization property is poor, is unfavorable for engineering site debugging.
By the further investigation to Stream temperature degree control principle, find generation problem have its source in two level attemperator after
Temperature causes the high temperature to change, so as to cause the disorder of control, and this problem is by optimizing merely due to increasing and decreasing injection flow rate
Pid control parameter is helpless to improve Stream temperature degree regulation quality.
The current general control program based on PID is bunch grade adjustment, but it has fatal ask in control process
Topic：
1）When Stream temperature degree is higher than setting value, cascade control system makes it sometimes appear that pitch is progressively closing off situation
Winner's stripping temperature is unable to come down for a long time, causes overheating problem frequently to occur.
2）When Stream temperature degree is less than setting value, cascade control system goes out it sometimes appear that pitch is being gradually opened situation
Existing spray desuperheating phenomenon, causes temperature to rise for a long time less than setting value.
3）Boiler does not have quick Solution after burning deteriorates for sudden temperature rise, bust problem.
4）The serious nonlinear problem of pitch does not have effective solution.
The content of the invention
The present invention proposes a kind of Stream temperature degree adjusting method that can lift Stream temperature degree regulation quality.
A kind of Stream temperature degree adjusting method of the present invention, including main PID controller and secondary PID controller, comprise the following steps：
（1）A setting value is inputted to main PID controller；
（2）By Stream temperature degree measured value compared with main PID controller setting value, when deviation setting number range in, then
Secondary PID controller takes main PID controller output valve as setting value；
（3）When Stream temperature degree measured value is more than main PID controller setting value, after two level attemperator output valve is heated up,
Compared with main PID controller output valve, big number is taken, secondary PID takes the big number to be used as secondary PID controller setting value；
（4）When Stream temperature degree measured value is less than main PID controller setting value, after two level attemperator output valve is cooled,
Compared with main PID controller output valve, decimal is taken, secondary PID takes this small and is used as secondary PID controller setting value；
（5）Secondary PID controller setting value carries out in secondary PID controller defeated after PID arithmetic with two level attemperator output valve
Go out to pitch controller, the opening and closing of pitch is controlled by pitch controller.
Preferably, line slope feed-forward regulation is entered to Stream temperature degree, using Stream temperature degree measured value as slope feed-forward regulation
Input value, the output valve after slope feed-forward regulation, the feedforward as secondary PID controller are output to pitch controller, including：
（1）One main vapour temperature hysteresis is set according to main vapour output temperature, main PID controller setting value and main vapour are lagged into temperature
Degree asks poor, and its difference is a, while a is set into higher limit m, lower limit n；
（2）When a is less than n, and meet that the difference between Stream temperature degree measured value and main PID controller setting value is less than simultaneously
At 4 DEG C, slope feedforward work, it is exported is output to pitch controller as the feedforward of secondary PID controller；
（3）When a is more than m, and meet that the difference between Stream temperature degree output valve and main PID controller setting value is big simultaneously
When -4 DEG C, slope feedforward is started working, and it is exported is output to pitch controller as the feedforward of secondary PID controller；
（4）Under remaining state, slope feedforward does not work.
Further, it is described to set overtemperature to drop control by force Stream temperature degree, for main vapour output temperature, overtemperature warning value is set,
When Stream temperature degree measured value is higher than overtemperature warning value, the first pulse signal is triggered, link pitch controller, control pitch increase
Aperture；When Stream temperature degree measured value exceedes setting time higher than overtemperature warning value, the second pulse signal is triggered, link pitch control
Device processed, control pitch increases aperture again, untill Stream temperature degree measured value is less than warning value.
Further, the overtemperature warning value is to believe less than main -8 DEG C of PID controller setting value, the second pulse of triggering
Number setting time is 4 minutes.
Further, secondary PID controller is controlled by linear regulation between the output and input of the secondary PID controller
Output；The output that the output of secondary PID controller feedovers with slope is after seeking difference, with unit load respectively by integration and ratio
Example conversion, as the control with changed scale integral parameter of secondary PID controller, control the output quantity of secondary PID controller.
Further, pitch feedback regulation pitch aperture is passed through between the output and input of pitch controller；As secondary PID
When the difference of the temperature of setting value and two level attemperator is less than setting value and pitch aperture is less than setting value and Stream temperature degree oneself
Move when input state three meets, start pulse signal, interlock pitch controller, adjust pitch aperture.
A kind of Stream temperature degree adjusting method of the present invention, by setting main PID controller setting value, Stream temperature degree is surveyed
Difference Discrete control and regulation of the value with main PID controller setting value, Stream temperature degree is controlled to adjust quality and greatly improve, energy
Really realizing does not allow the Stream temperature degree in the case of variable working condition to automatically adjust whole input, and keeps excellent in self-regulating process
Regulation quality.
The present invention proposes a kind of Stream temperature degree regulating system.
The present invention proposes a kind of Stream temperature degree regulating system, and the system includes：
Subtracter SUM1, Stream temperature degree measured value and main PID controller design temperature are asked poor；
First temperature selecting unit, including several thermal modules, different temperature limits, subtracter SUM1 are set respectively
The output valve of module selects its corresponding thermal module output in temperature selecting unit；
Low temperature control logic module, the output valve of temperature selecting unit after low temperature control logic module computing by exporting；
High-temperature control logic module, the output valve of temperature selecting unit after low temperature control logic module computing by exporting；
High temperature comparison module, by two level attemperator output valve with being exported after the output valve of high-temperature control logic module；
Low temperature comparison module, by two level attemperator output valve with being exported after the output valve of low temperature control logic module；
Output switching module, it is defeated that the output valve of high temperature comparison module or low temperature comparison module is sent to secondary PID controller
Enter end；
Pitch controller, the output signal of secondary PID controller is received, control the opening and closing of pitch.
Preferably, slope feedforward control system is provided between the secondary PID controller output and input, it includes
Main vapour temperature hysteresis module, a main vapour temperature hysteresis value is set according to Stream temperature degree measured value；
Subtracter SUM2 modules, Stream temperature degree measured value and main vapour temperature hysteresis are asked poor；
Bound selecting module, sets several temperature limits, subtracter SUM2 modules through bound selecting module according to
Exported after different limit value selections；
Second temperature selecting unit, including several thermal modules, each module set some temperature values, by subtracter
The difference of SUM1 modules, exported after the selection of temperature selecting unit；
Logic control module, the output temperature of bound selecting module is exported to secondary PID controller after logic control
Output end；
Subtracter SUM4 modules, before being used as after secondary PID controller output valve and the summation of the output valve of Logic control module
Feedback amount is inputted to pitch controller input.
Further, the output quantity of the subtracter SUM4 inputs defeated to secondary PID controller after linear regulation system
Enter end, it includes proportion function module and integral function module, and unit load exports two paths of signals, wherein all the way with subtracter
Integration feedforward amount of the SUM4 output quantity after integration module product as secondary PID controller, another way pass through proportion function
Ratio feedforward amount of the module as secondary PID controller.
Further, the pitch controller drops by force control system provided with overtemperature, it include high temperature higher limit module,
3rd pulse module, the first pulse module, the first time delay module and M/A stations, the M/A stations are pitch controller；The high temperature
Higher limit module is provided with ceiling temperature, and its input connection Stream temperature degree measured value, it is exported provided with two-way, wherein defeated all the way
Go out and be connected with the 3rd pulse module, another way connects the first time delay module and the first pulse module respectively, the 3rd pulse module and
The output of first pulse module passes sequentially through M/A stations and is connected with pitch.
Further, be provided with pitch looped system between the output and input at M/A stations, the output that M/A stands with it is defeated
Pitch looped system, including temperature setting module, the second time delay module, logic module, subtracter are provided between entering
SUM3 modules, setting value limit module, the second pulse module；
（1）Main PID controller output valve exports after seeking difference by subtracter SUM3 modules with two level attemperator output valve, number
When value exceedes the setting value of temperature setting module, export to logic module；
（2）When the output valve at M/A stations is less than the setting value of numerical definiteness module, the conducting of the second time delay module, output is to patrolling
Collect line module；
（3）Main vapour is in automatic control state；
（4）When（1）、（2）、（3）When condition is satisfied by, logic module conducting, the second time delay module turns on, and signal is anti-
It is fed to M/A stations input.
The present invention proposes a kind of Stream temperature degree regulating system that can lift Stream temperature degree regulation quality, is led by setting
PID controller setting value, by the difference of Stream temperature degree measured value and main PID controller setting value by temperature selecting unit not
Same thermal module is adjusted, and improves Stream temperature degree and controls to adjust quality, realizes the Stream temperature degree in the case of variable working condition
Whole input is automatically adjusted, and excellent regulation quality is kept in self-regulating process.
Brief description of the drawings
Fig. 1 is a kind of overall structure figure of Stream temperature degree regulating system of the present invention.
Fig. 2 is the structure chart of embodiment 1
Fig. 3 is the structure chart of the slope feedforward control system of embodiment 2.
Fig. 4 is the structure chart of the linear regulation service system of embodiment 3.
Fig. 5 is the structure chart that control system drops by force in the overtemperature of embodiment 4.
Fig. 6 is the structure chart of the pitch auxiliary adjustment system of embodiment 5.
Fig. 7 is the FUNCTION3 function parameters of embodiment 3.
Embodiment
Embodiment 1.
A kind of Stream temperature degree regulating system of the present invention, subtracter SUM1, by Stream temperature degree measured value and main PID control
Device design temperature asks poor；
First temperature selecting unit, including several thermal modules, different temperature limits, subtracter SUM1 are set respectively
The output valve of module selects its corresponding thermal module output in temperature selecting unit；
Low temperature control logic module, the output valve of temperature selecting unit after low temperature control logic module computing by exporting；
High-temperature control logic module, the output valve of temperature selecting unit after low temperature control logic module computing by exporting；
High temperature comparison module, by two level attemperator output valve with being exported after the output valve of high-temperature control logic module；
Low temperature comparison module, by two level attemperator output valve with being exported after the output valve of low temperature control logic module；
Output switching module, it is defeated that the output valve of high temperature comparison module or low temperature comparison module is sent to secondary PID controller
Enter end；
Pitch controller, the output signal of secondary PID controller is received, control the opening and closing of pitch.
Its control method comprises the following steps：
（1）A setting value is inputted to main PID controller；
（2）By Stream temperature degree measured value compared with main PID controller setting value, when deviation setting number range in, then
Secondary PID controller takes main PID controller output valve as setting value；
（3）When Stream temperature degree measured value is more than main PID controller setting value, after two level attemperator output valve is heated up,
Compared with main PID controller output valve, big number is taken, secondary PID takes the big number to be used as secondary PID controller setting value；
（4）When Stream temperature degree measured value is less than main PID controller setting value, after two level attemperator output valve is cooled,
Compared with main PID controller output valve, decimal is taken, secondary PID takes this small and is used as secondary PID controller setting value；
（5）Secondary PID controller setting value carries out in secondary PID controller defeated after PID arithmetic with two level attemperator output valve
Go out to pitch controller, the opening and closing of pitch is controlled by pitch controller.
It is main in this embodiment when the deviation of Stream temperature degree measured value and main PID controller setting value is within ± 3 DEG C
Setting value of the output of PID controller as secondary PID controller, secondary PID controller export temperature according to the value with two level attemperator
The deviation of degree controls the aperture of pitch.
When Stream temperature degree measured value is more than more than 3 DEG C of main PID controller setting value, if making the output of main PID controller
Value is used as secondary PID controller setting value, is two level attemperator output temperature more than secondary PID measured values, i.e., secondary PID controller setting
Value is more than measured value, and because secondary PID controller is counteractive, pitch is gradually opened, the Stream temperature degree around two level attemperator
Reducing, the measured value of secondary PID controller diminishes, and secondary PID controller measured value is less than setting value, and pitch progressively closes off, but this
When Stream temperature degree do not reduce completely, Stream temperature degree more and more higher can be caused, in order to ensure to adjust the correctness in direction, this hair
It is bright two level attemperator output temperature is increased by 2 DEG C after compare with main PID controller output valve, big number is taken, as secondary PID control
Device setting value, when secondary PID controller setting value is more than 2 DEG C of measured value, pitch is gradually opened, and finally master is reduced with this
Stripping temperature, Stream temperature degree regulation quality can be greatly improved by the method for the invention.
When Stream temperature degree measured value is less than below main -3 DEG C of PID controller setting value, if making the output of main PID controller
Value is used as secondary PID setting values, is two level attemperator output temperature more than secondary PID measured values, i.e. secondary PID setting values are more than secondary PID
Measured value, because secondary PID controller is counteractive, pitch is gradually opened, but now Stream temperature degree does not raise really, leads
Cause Stream temperature degree more and more lower；Therefore in order to ensure the correctness in regulation direction, two level attemperator output temperature is subtracted 2 by the present invention
DEG C, compared with secondary PID setting values, get the small value, as the setting value of secondary controller, in such cases, secondary PID regulator is set
Definite value is less than 2 DEG C of measured value, and pitch progressively closes off, and the rise of Stream temperature degree, Stream temperature degree can be greatly improved by this scheme
Regulation quality.
In order to further realize realization that system is adjusted to Stream temperature degree, the first temperature selecting unit described in the present embodiment,
Including HIGHMON2 modules, LOWMON1 modules, LOWMON2 modules, wherein 3 DEG C of HIGHMON2 modules design temperature, LOWMON1
Module is -3 DEG C, LOWMON2 modules are -8 DEG C, the low temperature control logic module, including OR1 modules and AND1 modules；
The high-temperature control logic module is AND2 modules；The high temperature comparison module is HISELECT modules；It is described low
Warm comparison module is LOSELECT modules；Output switching module include TRANSFER2 modules, TRANSFER3 modules,
TRANSFER4 modules, the modules of TRANSFER 5, RUNAVERAGE modules, the pitch controller are stood for M/A；Also include OR3 moulds
Block, for the output of AND1 modules and AND2 modules to be exported into TRANSFER3 modules.
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.
When the difference of Stream temperature degree measured value and main PID controller setting value in subtracter SUM1 modules is at 3 DEG C to -3 DEG C
Between when, AND1 modules and AND2 modules do not trigger, and OR3 modules negate, Stream temperature degree normal regulating, TRANSFER2 modules,
The Y roads conducting of TRANSFER3 modules, after being averaged by RUNAVERAGE modules, passes through TRANSFER4 modules, TRANSFER5 moulds
The N roads output of block, setting value of the main PID controller output valve as secondary PID regulator.
When main PID controller output valve is subtracted each other in subtracter SUM1 modules with main PID controller setting value, its value is higher than
During 3 DEG C of setting value, after the output valve of two level attemperator increases by 2 DEG C, taken with main PID controller output valve in LOSELECT modules
Greatly, HIGHMON2 modules are triggered, and when Stream temperature degree is adjusted to auto state, AND2 is triggered, and TRANSFER5 module Y roads are defeated
Go out, as the setting value of secondary PID regulator, by the integral action of secondary PID controller, persistently open pitch to reduce Stream temperature
Degree, so as to ensure that the correct direction of control.
When Stream temperature degree measured value and difference of the main PID controller setting value in subtracter SUM1 modules are less than less than -3 DEG C
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, is exported to secondary PID controller, the setting as secondary PID controller from the Y roads of TRANSFER4 modules, TRANSFER5 modules
Value, by the integral action of secondary PID controller, equally Stream temperature degree can be improved with continuously off pitch, so as to ensure that control
The correct direction of system.
When Stream temperature degree measured value is less than below -8 DEG C of setting value, LOWMON1 modules, the triggering of LOWMON2 module synchronizations,
OR1 modules turn on, and are exported from AND1 modules to the Y roads of TRANSFER4 modules, from the Y roads of TRANSFER4 modules, TRANSFER5
Module is exported to secondary PID controller, by the integral action of secondary PID controller, forces pitch instruction is quick to lower, until pitch
Completely close, ensure that the correct direction of control, improve the rapidity of pitch action.
Embodiment 2
Stream temperature degree measured value is adjusted by slope feedforward control system on the basis of embodiment 1 for the present embodiment,
Slope feedforward control system is provided between the secondary PID controller output and input, it includes
Main vapour temperature hysteresis module, a main vapour temperature hysteresis value is set according to Stream temperature degree measured value；
Subtracter SUM2 modules, Stream temperature degree measured value and main vapour temperature hysteresis are asked poor；
Bound selecting module, sets several temperature limits, subtracter SUM2 modules through bound selecting module according to
Exported after different limit value selections；
Second temperature selecting unit, including several thermal modules, each module set some temperature values, by subtracter
The difference of SUM1 modules, exported after the selection of temperature selecting unit；
Logic control module, the output temperature of bound selecting module is exported to secondary PID controller after logic control
Output end；
Subtracter SUM4 modules, before being used as after secondary PID controller output valve and the summation of the output valve of Logic control module
Feedback amount is inputted to pitch controller input.
The present embodiment includes operating procedure：
（1）One main vapour temperature hysteresis is set according to main vapour output temperature, main PID controller setting value and main vapour are lagged into temperature
Degree asks poor, and its difference is a, while a is set into higher limit m, lower limit n；
（2）When a is less than n, and meet that the difference between Stream temperature degree measured value and main PID controller setting value is less than simultaneously
At 4 DEG C, slope feedforward work, its output for exporting with secondary PID controller asks poor, feedforward of the difference as secondary PID controller
It is output to pitch controller；
（3）When a is more than m, and meet that the difference between Stream temperature degree output valve and main PID controller setting value is big simultaneously
When -4 DEG C, slope feedforward is started working, and its output for exporting with secondary PID controller asks poor, and the difference is as secondary PID controller
Feedforward be output to pitch controller；
（4）Under remaining state, slope feedforward does not work.
Main vapour temperature hysteresis module of the present invention is LEADLAG1 modules, and bound selecting module includes LOWHMON3 moulds
Block and HIGHMON4 modules, second temperature selecting unit include LOWMON4 modules and HIGHMON5 modules, the LOWMON4 moulds
Block sets 4 DEG C of temperature, and the HIGMON5 modules set -4 DEG C of temperature；Lower limit n is provided with wherein in LOWMON3 modules,
Higher limit m is provided with HIGMON4 modules；The Logic control module includes AND3 blocks and AND5 modules, in addition to
TRANSFER6 modules, exported for by the signal output of OR4 modules to subtracter SUM4 modules, passing through subtracter SUM4 modules
To pitch controller, the opening and closing of pitch is controlled.
It is a that the Stream temperature degree measured value seeks difference with LEADLAG1 modules in subtracter SUM2 modules, and Stream temperature degree measures
It is b that value seeks difference with main PID controller setting value in SUM1 modules；
When a values are less than the n values in LOWMON3 low value modules, b values are less than LOWMON4 low value modules, meanwhile, Stream temperature degree
Automatically meet in input state, AND5 modules trigger condition, the output of OR4 modules, TRANSFER6 Y roads conducting, slope feedforward is defeated
Go out.
When a values are more than HIGHMON4 high level modules（M values）, b values are more than HIGHMON5 modules, and Stream temperature degree is put into automatically
State, the triggering of AND3 modules, the output of OR4 modules, the Y roads conducting of TRANSFER6 modules, slope feedforward work.
It can not meet condition in AND5 modules and AND3 modules condition, illustrate that the change of Stream temperature degree speed is little, main vapour
Temperature change is smooth, it is not necessary to carries out controls in advance.
The present embodiment can be controlled in advance by slope feedforward logical control method according to the variation tendency of Stream temperature degree
System, when temperature ascend to heaven speed it is larger when, in advance give pitch a preset aperture, increase desuperheating water, control Stream temperature degree in advance
Change, when temperature reduction of speed rate is larger, pitch is closed in advance, prevents Stream temperature degree rapid decrease.
Embodiment 3
Desuperheating water pitch it is non-linear, and influence one of major reason of Stream temperature degree Control platform, and this characteristic
In desuperheat penstock in the case of small guide vane, valve opening changes 3% under small guide vane for outstanding behaviours, identical with the change of big aperture
Aperture caused by attemperation water flow differ several times it is even more more, if this common desuperheating water valve characteristic school not in time
Just, the regulation quality of Stream temperature degree system will have a greatly reduced quality, and cause when valve opening is big, governing speed is too slow；Valve is opened
Hour is spent, governing speed is again too fast.In addition, valve frequent movement, can also serious mill be produced to valve element, executing agency
Damage, greatly increases maintenance load.Therefore Stream temperature degree regulation quality is improved, it is necessary to solve pitch nonlinear problem.
The present embodiment adds linear regulation system on the basis of embodiment 1 and embodiment 2, solves desuperheating water tune
The Nonlinear Adjustment problem of door, it includes proportion function module and integral function module, and unit load exports two paths of signals, wherein
Passed through all the way with the integration feedforward amount after the subtracter SUM4 integrated module product of output quantity as secondary PID controller, another way
Ratio feedforward amount of the proportion function module as secondary PID controller is crossed, to the proportional integration parameter as change, control and tune
The output of secondary PID controller is saved, proportion function module described in the present embodiment is FUNCTION6 modules, and integration module is
MULTIPLY modules.
Specifically, the output valve of subtracter SUM4 modules and unit load wherein export in MULTIPLY modules all the way
Product, integration feedforward amount of the product value as secondary PID controller, unit load another way pass through FUNCTION6 module conducts
The ratio feedforward amount of secondary PID controller, to control and adjust the output quantity of secondary PID controller, turning into influences secondary PID controller
Parametric variable, the time of integration in low instruction can be substantially increased, significantly weaken integration in small guide vane to the shadow of pitch
Ring.
FUNCTION3 function parameters are the output valve of subtracter SUM4 modules, as seen from Figure 7, when valve opening exists
When less than 15%, using system described in the present embodiment, instruction numerical value is reduced, basically reaches flow instruction and flow curve phase
Match somebody with somebody, increase the linearity of pitch.
Embodiment 4.
The control of Stream temperature degree most importantly prevents overtemperature in the present embodiment, must if the super set value calculation deviation of temperature
Must take immediate steps and temperature is lowered, while if because of therrmodynamic system reason, pitch in off position, due to follow-up operating mode
Changing, temperature is gradually being gone up, and needs pitch to depart from closed mode, can receive the right instructions of secondary PID controller at any time, this
Embodiment is on the basis of embodiment 1 and embodiment 2 and embodiment 3, and there is provided overtemperature to drop control system by force for increase, and it includes height
Warm higher limit module, the 3rd pulse module, the first pulse module, the first time delay module and M/A stations, the M/A stations are pitch control
Device processed；The high temperature higher limit module is provided with ceiling temperature, and its input connection Stream temperature degree measured value, it is defeated that it is provided with two-way
Go out, wherein output is connected with the 3rd pulse module all the way, another way connects the first time delay module and the first pulse module respectively, the
The output of three pulse modules and the first pulse module passes sequentially through M/A stations and is connected with pitch.
High temperature higher limit module is internally provided with a warning value, and the warning value is higher than main PID controller setting value 8
℃。
Specifically, the present embodiment high temperature higher limit module is HIGHMON1 modules, the 3rd pulse module is ONESHOT3 moulds
Block, the first pulse module are ONESHOT1 modules, the first time delay module ONDELAY2 modules, and it also includes OR2 modules, described the
OR2 modules are connected with M/A stations successively for the output of three pulse modules and the first pulse module.
When Stream temperature degree measured value is higher than 8 DEG C of standard value, the output of HIGHMON1 modules is 1, trigger pulse module
ONESHOT3, continue 3 seconds, the conducting of OR2 modules, M/A stand control pitch aperture increase by 3%；When Stream temperature degree measured value is higher than standard
When reaching 4 minutes during 8 DEG C of value, ONDELAY2 modules are triggered after being delayed 4 minutes, and ONESHOT1 modules are delayed 3 seconds, and OR2 modules are led
Logical, M/A stand control pitch apertures are further added by 3%.The present embodiment is negated module by ONDELAY2 modules, every 4 minutes desuperheating waters
Adjust door aperture increase by 3%, loop control, untill Stream temperature degree is less than standard value.
Embodiment 5
Pitch instruction is caused to be 0 always due to operating condition or because Stream temperature degree is always below setting value,
But when although Stream temperature degree measured value is less than setting value, it is gradually increased when approaching setting value, it necessarily shows two level
Temperature raises after attemperator, when the temperature after two level attemperator is bigger than setting value, triggers a pulse, departs from pitch and closes shape
State, it is ready to be adjusted, otherwise due to integration saturation or tracking, instruction remains as 0, if done not in time
In advance, then following Stream temperature degree can be raised significantly, be now adjusted and necessarily lagged, and can cause the frequent significantly ripple of Stream temperature degree
Dynamic even overtemperature.
Therefore the present embodiment sets pitch looped system, the output and input at M/A stations on the basis of embodiment 4
Between be provided with pitch looped system, including temperature setting module, the second time delay module, logic module, subtracter
SUM3 modules, setting value limit module, the second pulse module；
（1）Main PID controller output valve exports after seeking difference by subtracter SUM3 modules with two level attemperator output valve, number
When value exceedes the setting value of temperature setting module, export to logic module；
（2）When the output valve at M/A stations is less than the setting value of numerical definiteness module, the conducting of the second time delay module, output is to patrolling
Collect line module；
（3）Main vapour is in automatic control state；
（4）When（1）、（2）、（3）When condition is satisfied by, logic module conducting, the second time delay module turns on, and signal is anti-
It is fed to M/A stations input.
The present embodiment temperature setting module is HIGHMON3 modules, and the second time delay module is ONDELAY1 modules, logic line
Road module is AND4 modules, setting value limit module is LOWMON6 modules, the second pulse module is ONESHOT2 modules, wherein
The first input end of SUM3 modules connects main PID controller output, the connection two level attemperator output of the second input, HIGHMON3
Module is connected with the output of SUM3 modules；Pitch controller wherein all the way output be sequentially connected LOWMON6 modules with and
ONDELAY1 modules, output, the output of HIGHMON3 modules of ONDELAY1 modules are connected in AND4 modules, AND4 modules
Output passes through the MODODE module feedbacks that the manual operator MA of ONESHOT2 modules, OR2 modules and pitch controller stands to pitch control
Device processed.
When pitch instruction is less than 0.2, the triggering of LOWSUM3 modules, it is delayed 3 minutes through time delay module ONDELAY1 modules,
Now secondary PID controller measured value is that two level attemperator output temperature subtracts each other with secondary PID controller setting value in SUM3 modules,
If greater than 5 DEG C, then HIGHMON3 modules trigger, when Stream temperature degree automatically input state, and LOWSUM3 modules,
HIGHMON3 modules trigger simultaneously when, the triggering of AND4 modules, inputted after ONESHOT2 module delays by OR2 modules to pitch
The MODODE modules at the manual operator MA stations of controller, by MODODE module feedbacks to pitch controller, pitch aperture increases by 1%, this
When pitch aperture leave 0, depart from integration saturation or tracking mode, the right instructions of secondary PID controller can be received at any time.
Claims (5)
1. a kind of Stream temperature degree regulating system, it is characterised in that the system includes：
Subtracter SUM1, Stream temperature degree measured value and main PID controller design temperature are asked poor；
First temperature selecting unit, including several thermal modules, different temperature limits, subtracter SUM1 modules are set respectively
Output valve its corresponding thermal module output is selected in temperature selecting unit；
Low temperature control logic module, the output valve of temperature selecting unit after low temperature control logic module computing by exporting；
High-temperature control logic module, the output valve of temperature selecting unit after low temperature control logic module computing by exporting；
High temperature comparison module, by two level attemperator output valve with being exported after the output valve of high-temperature control logic module；
Low temperature comparison module, by two level attemperator output valve with being exported after the output valve of low temperature control logic module；
Output switching module, the output valve of high temperature comparison module or low temperature comparison module is sent to secondary PID controller input；
Pitch controller, the output signal of secondary PID controller is received, control the opening and closing of pitch.
A kind of 2. Stream temperature degree regulating system as claimed in claim 1, it is characterised in that：The secondary PID controller output with it is defeated
Slope feedforward control system is provided between entering, it includes
Main vapour temperature hysteresis module, a main vapour temperature hysteresis value is set according to Stream temperature degree measured value；
Subtracter SUM2 modules, Stream temperature degree measured value and main vapour temperature hysteresis are asked poor；
Bound selecting module, several temperature limits are set, subtracter SUM2 modules are through bound selecting module according to difference
Exported after limit value selection；
Second temperature selecting unit, including several thermal modules, each module set some temperature values, by subtracter SUM1
The difference of module, exported after the selection of temperature selecting unit；
Logic control module, the output temperature of bound selecting module is exported to secondary PID controller after logic control and exported
End；
Subtracter SUM4 modules, as feedforward amount after secondary PID controller output valve and the output valve of Logic control module are summed
Input to pitch controller input.
A kind of 3. Stream temperature degree regulating system as claimed in claim 2, it is characterised in that：The output quantity warp of the subtracter SUM4
To secondary PID controller input, it includes proportion function module and integral function module, unit for input after crossing linear regulation system
Load exports two paths of signals, wherein the output quantity with subtracter SUM4 is used as secondary PID control after integration module product all the way
The integration feedforward amount of device, another way pass through ratio feedforward amount of the proportion function module as secondary PID controller.
A kind of 4. Stream temperature degree regulating system as claimed in claim 3, it is characterised in that：The pitch controller is provided with overtemperature
Strong drop control system, it includes high temperature higher limit module, the 3rd pulse module, the first pulse module, the first time delay module and M/A
Stand, the M/A stations are pitch controller；The high temperature higher limit module is provided with ceiling temperature, its input connection Stream temperature
Measured value is spent, it is exported provided with two-way, wherein output is connected with the 3rd pulse module all the way, another way connects the first delay respectively
Module and the first pulse module, the output of the 3rd pulse module and the first pulse module pass sequentially through M/A stations and are connected with pitch.
A kind of 5. Stream temperature degree regulating system as claimed in claim 4, it is characterised in that：Set between the output and input at M/A stations
Have a pitch looped system, including temperature setting module, the second time delay module, logic module, subtracter SUM3 modules,
Setting value limits module；
（1）Main PID controller output valve exports after seeking difference by subtracter SUM3 modules with two level attemperator output valve, and numerical value surpasses
During the setting value of excess temperature setting module, export to logic module；
（2）When the output valve at M/A stations is less than the setting value of numerical definiteness module, the conducting of the second time delay module, export to logic line
Road module；
（3）Main vapour is in automatic control state；
（4）When（1）、（2）、（3）When condition is satisfied by, logic module conducting, the second time delay module is turned on, and signal is fed back to
M/A stations input.
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| CN201720456178.6U CN207146353U (en) | 2017-04-27 | 2017-04-27 | A kind of Stream temperature degree regulating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106997171A (en) * | 2017-04-27 | 2017-08-01 | 中国大唐集团科学技术研究院有限公司西北分公司 | A kind of Stream temperature degree adjusting method and regulating system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106997171A (en) * | 2017-04-27 | 2017-08-01 | 中国大唐集团科学技术研究院有限公司西北分公司 | A kind of Stream temperature degree adjusting method and regulating system |
| CN106997171B (en) * | 2017-04-27 | 2023-09-01 | 中国大唐集团科学技术研究院有限公司西北分公司 | Main steam temperature adjusting method |
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