CN113296549A - Deaerator liquid level control system and method based on time sequence control and inverse function operation - Google Patents
Deaerator liquid level control system and method based on time sequence control and inverse function operation Download PDFInfo
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Abstract
The invention belongs to the control technology, in particular to a deaerator liquid level control system and a deaerator liquid level control method based on time sequence control and inverse function operation.
Description
Technical Field
The invention belongs to the control technology, and particularly relates to a deaerator liquid level control system and method based on time sequence control and inverse function operation.
Background
In order to make the liquid level control of the deaerator more stable, many units are provided with two pipelines and valves which have different through-flow capacities and are arranged in parallel and used for controlling the flow of condensed water entering the deaerator, as shown in fig. 1. Generally, when the unit load is low and the water supply demand is not more than 1800t/h, the liquid level of the deaerator is controlled by a valve with small through flow, and when the unit load is high and the water supply demand is more than 1800t/h, the liquid level of the deaerator is controlled by a valve with large through flow or the liquid level of the deaerator is controlled by a large valve and a small valve together. The arrangement and control mode of the field deaerator liquid level control equipment of No. 5 and No. 6 units in Tianwan is the mode, and because valve position instructions need to be distributed to two valves, when the logic test of deaerator liquid level control is carried out, the original design is exposed, so that a plurality of problems exist, wherein the most fatal defect is that manual and automatic undisturbed switching of a regulator and the valves cannot be realized. These drawbacks have a very negative impact on the safe operation of the plant and therefore require an optimization of the existing control logic.
As shown in fig. 2, in the conventional control method, the output of the PI regulator is connected to the "auto command" pin of the manual operator of the regulator, and the "output value" of the manual operator of the regulator is further determined by a function F1(X) and function F2(X) distributing the total valve position command via function F1The instruction after the (X) operation acts directly on the small valve, via function F2And (X) the operated command acts on the big valve through the big valve manual operator. The manual operator module AMAN is used for realizing 'tracking mode', 'tracking value', 'automatic mode' PI regulation of undisturbed switchingThe important pins of the node module PID, such as 'tracking/automatic mode' and 'tracking value', are all configured. The method is characterized by mainly comprising the following steps:
1) lack of tracking logic of the PI regulator in the manual regulator non-automatic mode;
2) the manual operator of the regulator and the manual operator of the big valve lack tracking logic;
3) the small valve lacks a manual operator and associated control logic;
4) the valve has a single use mode, and can not be freely combined by manual control of a large valve and a small valve.
The problems thus posed are: when the manual regulator and the manual valve operator are operated automatically, undisturbed switching cannot be realized, severe oscillation of the PI regulator can be caused, and even shutdown and shutdown can be caused; the single manual automatic control of the small valve cannot be realized; the automatic free combination of the sizes and the hands of the deaerator cannot be realized, the control is not flexible enough, the applicability is poor, and the capacity of coping with fault working conditions and the online maintenance of the valve is weak.
Disclosure of Invention
The invention aims to provide a deaerator liquid level control system and a deaerator liquid level control method based on time sequence control and inverse function operation, which can realize careless switching of operation of a regulator manual operator and a valve manual operator.
The technical scheme of the invention is as follows:
the deaerator liquid level control system based on time sequence control and inverse function operation comprises a PI regulator, a regulator manual operator and a big valve manual operator, wherein the PI regulator sends an automatic control valve position general instruction signal to the regulator manual operator, converts the automatic control valve position general instruction signal into a big valve automatic control input signal through the regulator manual operator and sends the big valve automatic control input signal to the big valve manual operator;
the small valve manual operator is connected with the output end of the main valve position instruction distribution unit;
the undisturbed tracking value calculating unit is connected with the input end of the manual regulator;
two trigger tracking modes and an input automatic time sequence control unit, wherein one of the two trigger tracking modes is connected with the input end of the small valve manual operator, and the other trigger tracking mode is respectively connected with the input ends of the PI regulator, the regulator manual operator and the large valve manual operator;
the valve use mode judging unit is respectively connected with the total valve position instruction distributing unit, the triggering tracking mode connected with the input end of the small valve manual operator, and the input ends of the input automatic time sequence control unit and the undisturbed tracking value calculating unit;
the small valve manual operator independently sends an operation command to the small valve;
the valve use mode judging unit is used for judging the automatic working modes of the large valve and the small valve;
the main valve position instruction distribution unit is used for realizing the switching of different control ranges of a small valve independent automatic mode and a double valve automatic mode;
the trigger tracking mode and input automatic time sequence control unit is used for realizing the function of entering the tracking mode before the input is automatic and entering the automatic mode again in the next second after the upstream and downstream instructions are consistent;
and the undisturbed tracking value calculating unit is used for calculating tracking values in different modes.
The valve use mode judging unit outputs 4 working modes of a large valve independent automatic mode, a small valve independent automatic mode, a double valve automatic mode and a double valve manual mode by calling the manual and automatic states of the large valve and the small valve and through logic judgment, and the judging signals of the 4 working modes can be called by other area units.
The judgment signals of the 4 modes are respectively as follows:
when two conditions that the large valve is automatically put into the valve and the small valve is not automatically put into the valve are met, a signal of a single automatic mode of the large valve is output through the AND gate; when the two conditions that the small valve is automatically put into the valve and the large valve is not automatically put into the valve are met, a signal of a small valve independent automatic mode is output through the AND gate; when two conditions that the large valve is automatically put in and the small valve is also automatically put in are met, a signal of a double-valve automatic mode is output through the AND gate; when the two conditions that the large valve is not put into automation and the small valve is not put into automation are met, a signal of 'double-valve manual mode' is output through the AND gate.
The total valve position instruction distribution unit outputs a large valve opening instruction signal, the large valve opening instruction signal is directly transmitted to an automatic instruction interface of a large valve manual operator, or the small valve independent automatic mode and the non-small valve independent automatic mode are selectively output according to the manual automatic mode at the moment, and the output value is transmitted to the automatic instruction interface of the small valve manual operator.
The total valve position instruction distribution unit 3 passes through a function module F2(X) outputting a large valve opening command signal; passing function module F1(X) and F5(X) performing selective output of both a small-valve individual automatic mode and a non-small-valve individual automatic mode; wherein, F1(X) is y1＝2.5x1、0≤x1≤16、0≤y1≤40；F5(X) is y5＝2.78x5、0≤x5≤36、0≤y5≤100；F2(X) is y2＝1.19(x2-16)、16≤x2≤100、0≤y2≤100；x1、x2And x5All the signals are valve position total instruction signals and y acquired by corresponding functions1Small valve opening command, y, for "non-small valve individual automatic mode5Small valve opening command, y, for "small valve individual automatic mode2I.e., the large valve opening command.
The trigger tracking mode and input automatic time sequence control unit realizes input automatic operation by utilizing a pulse module and a delay module which are respectively connected with four signals of small valve input automatic, small valve switch manual, large valve switch manual and large valve input automatic, and generates tracking signals for a manual operator of the regulator and a PI regulator.
When the small valve is automatically switched, signals are respectively and simultaneously transmitted to the pulse module and the delay module, the signals transmitted to the pulse module are immediately triggered into 2-second pulse short tracking signals, the 2-second pulse short tracking signals are output to the tracking mode interface and the OR gate input pin of the small valve manual operator, the signals transmitted to the delay module are output after being delayed for 3 seconds, small valve switching automatic mode instruction signals are generated and are transmitted to the automatic mode interface of the small valve manual operator;
when the big valve is automatically switched, signals are respectively and simultaneously transmitted to the pulse module and the delay module, the signals transmitted to the pulse module are immediately triggered into 2-second pulse short tracking signals, the 2-second pulse short tracking signals are output to the big valve manual operator tracking mode interface and/or the gate input pin, the signals transmitted to the delay module are output after being delayed for 3 seconds, a big valve switching automatic mode instruction signal is generated and is transmitted to the big valve manual operator automatic mode interface;
when the small valve is manually switched, a signal is transmitted to the pulse module and immediately triggered into a 2-second pulse short tracking signal, and the 2-second pulse short tracking signal is output to an input pin of the OR gate;
when the big valve is switched manually, the signal is transmitted to the pulse module to be immediately triggered into a 2-second pulse short tracking signal, and the 2-second pulse short tracking signal is output to an input pin of the OR gate.
When the OR gate receives at least one 2-second pulse signal generated by the small valve operation automatic signal, the small valve switch manual signal, the large valve operation automatic signal and the large valve switch manual signal, the output of the OR gate generates a 2-second pulse short tracking signal of the regulator hand operator, and the 2-second pulse short tracking signal is transmitted to a tracking mode interface of the regulator hand operator.
When the signal of the manual regulator in the automatic state is '1', the manual regulator is directly converted into an instruction for starting automatic operation of the PI regulator and is transmitted to an automatic/tracking mode interface of the PI regulator, so that the PI regulator enters an automatic mode; when the signal of the manual regulator in the automatic state is '0', the manual regulator is directly converted into an instruction for starting tracking calculation of the PI regulator and is transmitted to an automatic/tracking mode interface of the PI regulator, so that the PI regulator enters a tracking mode.
The undisturbed tracking value calculating unit comprises two adders, namely a first adder and a second adder, and comprises three selection modules which are respectively a first selection module, namely a small valve independent automatic mode selection module, a second selection module, namely a large valve independent automatic mode selection module, and a third selection module, namely a double valve automatic mode selection module; the undisturbed tracking value calculation unit respectively passes the output values of the small valve manual operator through a function module F3(X) and F6(X) operation, the output value of the big valve manual operator passes through a function module F4(X) calculating;
warp F3(X) calculating and outputting a small valve tracking value signal under the small valve 'non-small valve independent automatic mode', and transmitting the small valve tracking value signal toA first adder inlet;
warp F6(X) calculating and outputting a small valve tracking value signal under a small valve independent automatic mode, and transmitting the small valve tracking value signal to the inlet of the first selection module;
warp F4(X) calculating and outputting a large valve tracking value signal, and respectively transmitting the large valve tracking value signal to inlets of a first adder and a second adder;
F3(X) and F4The output signal of (X) is operated by a first adder to form a tracking value signal in a double-valve automatic mode and is transmitted to a third selection module;
F4(X) and the signal of the correction constant are calculated by a second adder to form a tracking value signal in a large valve independent automatic mode, and the tracking value signal is transmitted to a second selection module;
the output of the third selection module is a final tracking value signal which is transmitted to a tracking value interface of the manual regulator operator 7.
When the small valve is in the single automatic mode, the outputs of the three selection modules are: the first selection module selects and outputs the channel F6(X) the small valve tracking value signal in the small valve single automatic mode is calculated, the second selection module selects and outputs the output value of the first selection module, the third selection module selects and outputs the output value of the second selection module, namely the final output value is F6(X) a small valve tracking value signal in a "small valve individual automatic mode" of operation;
when the big valve is in the single automatic mode, the outputs of the three selection modules are: the first selection module selects the output value to be transmitted to the second selection module, but the output value is not selected, the second selection module outputs the output value of the second adder, namely the tracking value signal in the large valve single automatic mode, and the third selection module selects the output value of the second selection module, namely the final output value is the tracking value signal in the large valve single automatic mode transported by the second adder;
when in the double-valve automatic mode, the output of the three selection modules is that when the first selection module and the second selection module select the output value to be transmitted to the third selection module, the output value is not selected. The third selection module outputs the output value of the first adder, namely the tracking value signal in the double-valve automatic mode, and the final output value is the tracking value signal in the large-valve single automatic mode transported by the second adder.
A deaerator liquid level control method based on time sequence control and inverse function operation utilizes a deaerator liquid level control system based on time sequence control and inverse function operation to carry out the following operations:
step 1) when a small valve or a large valve is automatically operated, an operation signal simultaneously enters a valve use mode judging unit and a triggering tracking mode and an automatic switching time sequence control unit;
step 2) the valve use mode judging unit immediately finishes the judgment of the valve working mode, generates a valve working mode signal and sends the valve working mode signal to the total valve position instruction distributing unit and the undisturbed tracking value calculating unit;
step 3) triggering a tracking mode and putting into an automatic time sequence control unit to immediately generate a valve tracking signal, and sending the valve tracking signal to a small valve manual operator or a large valve manual operator; generating a tracking signal of the regulator hand operator, and sending the tracking signal to the regulator hand operator; generating a PI regulation automatic/tracking signal, and sending the PI regulation automatic/tracking signal to a PI regulator;
step 4) the small valve manual operator or the large valve manual operator receives a tracking signal generated by triggering a tracking mode and switching into an automatic time sequence control unit and a signal for the valve to enter an automatic mode, and also receives a small valve manual operator or a large valve manual operator automatic control input instruction signal from a main valve position instruction distribution unit; when the small valve manual operator or the large valve manual operator receives a tracking signal generated by triggering a tracking mode and putting into an automatic time sequence control unit, the small valve manual operator or the large valve manual operator immediately enters the tracking mode, a tracking value is a last-moment output value of the small valve manual operator or the large valve manual operator and is output to a final valve position instruction signal of local equipment, and meanwhile, the final valve position instruction signal is also sent to a non-interference tracking value calculation unit;
step 5) receiving the valve working mode signal of the valve use mode judging unit and the final valve position instruction signal of the small valve manual operator and the large valve manual operator by the undisturbed tracking value calculating unit, calculating and generating a tracking value signal of the regulator manual operator, and sending the tracking value signal to the regulator manual operator;
step 6) the regulator hand operator receives a regulator hand operator tracking signal generated by a trigger tracking mode and an input automatic time sequence control unit and a regulator hand operator tracking value signal of a undisturbed tracking value calculation unit, generates an output instruction total valve position instruction signal in the regulator hand operator tracking mode, and sends the output instruction total valve position instruction signal to a total valve position instruction distribution unit and a PI regulator;
step 7) the PI regulator receives a trigger tracking mode and puts into an automatic time sequence control unit to generate a PI regulator tracking signal, an output instruction total valve position instruction signal from the regulator manual operator is called immediately, an output instruction in the PI regulator tracking mode is generated, and the output instruction is sent to the regulator manual operator;
and 8) receiving the valve working mode signal generated by the valve use mode judging unit and the output instruction total valve position instruction signal of the regulator manual operator by the total valve position instruction distributing unit, calculating and generating an automatic control input instruction of the small valve manual operator or the large valve manual operator, and transmitting the automatic control input instruction to the small valve manual operator or the large valve manual operator.
The invention has the following remarkable effects:
1) the manual automatic undisturbed switching of the regulator and the valve is realized by additionally arranging a valve use mode judging unit, a trigger tracking mode and input automatic time sequence control unit and an undisturbed tracking value calculating unit and reconfiguring;
2) by additionally arranging the small valve manual operator, the small valve can be more flexibly and independently controlled manually and automatically;
by additionally arranging the small valve manual operator and optimizing the configuration of the original large valve manual operator, the large valve and the small valve are controlled in 4 manual automatic combination modes, and more choices are provided for users.
Drawings
FIG. 1 is a diagram of the layout of a deaerator liquid level control pipeline and valves;
in the figure: 101. from condenser, 102, condensate pump, 103, large regulating valve, 104, small regulating valve, 105, electric bypass valve, 106, electric isolating valve, 107, to deaerator;
FIG. 2 is a schematic diagram of a liquid level control method of a conventional deaerator;
FIG. 3 is a schematic diagram of a deaerator liquid level control system based on time sequence control and inverse function operation;
FIG. 4 is a schematic diagram of a valve use mode determining unit;
FIG. 5 is a schematic diagram of a total valve position command distribution unit;
FIG. 6 is a schematic diagram of a triggered tracking mode and an engaged automatic timing control unit;
FIG. 7 is a schematic diagram of an undisturbed tracking value calculation unit;
in the figure: 1. a small valve manual operator; 2. a valve use mode judging unit; 3. a total valve position command distribution unit; 4. triggering a tracking mode and putting into an automatic time sequence control unit; 5. a undisturbed tracking value calculation unit; a PI regulator; 7. an adjuster manual operator; 8. big valve manual operator.
Detailed Description
The invention is further illustrated by the accompanying drawings and the detailed description.
As shown in fig. 2, the control system in the prior art includes a PI regulator 6, a regulator hand operator 7, and a large valve hand operator 8. The PI regulator 6 receives a set value signal and an actual value signal sent by an upstream control logic, converts the set value signal and the actual value signal into an automatic control valve position total command signal, sends the automatic control valve position total command signal to the regulator manual operator 7, and the regulator manual operator 7 converts the automatic control valve position total command signal into a valve position total command signal, respectively sends the valve position total command signal to X-axis input ends of a command function F1(X) and a function F2(X), and respectively sends the command signal to X-axis input ends of the command function F1(X) and the function F2(X) through the F1(X) calculating Y-axis output to form small valve opening command signal directly acting on small valve via F2And (X) calculating the Y-axis output of the large valve manual operator to form a large valve automatic control input signal, sending the large valve automatic control input signal to the large valve manual operator 8, and converting the large valve manual operator 8 into a final large valve opening command signal to be sent to the large valve.
Wherein the instruction function F1The mathematical expression of (X) is y1＝2.5x、0≤x1≤16、0≤y1Less than or equal to 40; instruction function F2The mathematical expression of (X) is y2＝1.19(x2-16)、16≤x2≤100、0≤y2≤100。
x1And x2Are all valve position total command signals, y1Is a small valve opening command, y2Is a large valve opening command。
As shown in fig. 3, in the newly designed control system,
1) a small valve manual operator 1 is additionally arranged and is used for independently operating the small valve.
2) And a valve use mode judging unit 2 is additionally arranged and is used for judging the automatic working modes of the large valve and the small valve.
3) And a total valve position instruction distribution unit 3 is additionally arranged and is used for realizing the switching of different control ranges of a small valve independent automatic mode and a double valve automatic mode.
4) The function of entering the tracking mode before the automatic switching is realized by adding a trigger tracking mode and an automatic switching time sequence control unit 4, and then entering the automatic mode in the next second after the upstream and downstream instructions are consistent is realized.
5) An undisturbed tracking value calculation unit 5 is additionally arranged and used for calculating tracking values in different modes, and the module is one of cores for realizing undisturbed switching.
6) And the PID of the manual operator module AMAN (comprising a small valve manual operator 1, a regulator manual operator 7 and a large valve manual operator 8 in the figure 3) and the PI regulator 6 are started to be used for tracking and externally inputting automatic pins, relevant signals of the triggering tracking mode and the inputting automatic time sequence control unit 4 and the undisturbed tracking value calculation unit 5 are called, and a new control method capable of realizing undisturbed switching is reconfigured.
As shown in fig. 4, the principle of the valve use mode determining unit 2 is as follows:
when two conditions that the large valve is automatically put into the valve and the small valve is not automatically put into the valve are met, a signal of a single automatic mode of the large valve is output through the AND gate; when the two conditions that the small valve is automatically put into the valve and the large valve is not automatically put into the valve are met, a signal of a small valve independent automatic mode is output through the AND gate; when two conditions that the large valve is automatically put in and the small valve is also automatically put in are met, a signal of a double-valve automatic mode is output through the AND gate; when the two conditions that the large valve is not put into automation and the small valve is not put into automation are met, a signal of 'double-valve manual mode' is output through the AND gate. The 4 operating mode signals may be invoked by other zone units.
The automatic state of the large valve and the small valve is called to carry out simple and configuration logic judgment, 4 working modes of a large valve independent automatic mode, a small valve independent automatic mode, a double valve automatic mode and a double valve manual mode are output, and a plurality of mode signals can be called by other area units.
As shown in fig. 5, the principle of the total valve position command distribution unit 3 is:
F1(X) is a command function of a non-small valve independent automatic mode, is used for converting a total valve position command into a small valve automatic command in the non-small valve independent automatic mode, and has a mathematical expression of y1＝2.5x1、0≤x1≤16、0≤y1≤40；F5(X) is a command function of 'small valve single automatic mode' and is used for converting a total valve position command into a small valve automatic command in 'small valve single automatic mode', and the mathematical expression of the command function is y5＝2.78x5、0≤x5≤36、0≤y5≤100；F2(X) is a big valve command function, is used for converting the total valve position command into a big valve automatic command, and has a mathematical expression of y2＝1.19(x2-16)、16≤x2≤100、0≤y2≤100。(x1、x2And x5Are all valve position total command signals, y1Small valve opening command, y, for "non-small valve individual automatic mode5Small valve opening command, y, for "small valve individual automatic mode2I.e., the large valve opening command).
When function module F2(X) receives the output value (i.e. the total valve position command) from the manual regulator 7 to a command function F2(X) X-axis input end, via F2(X) is calculated at F2(X) outputting a large valve opening command signal by the Y axis, and directly transmitting the large valve opening command signal to an automatic command interface of the large valve manual operator;
when function module F5(X) receives the output value (i.e. the total valve position command) from the manual regulator 7 to a command function F5(X) X-axis input end, via F5(X) is calculated at F5(X) Y-axis output small valve' small valve is automatic independentlyIn the mode, a small valve opening instruction signal is transmitted to the selection module;
when function module F1(X) receives the output value (i.e. the total valve position command) from the manual regulator 7 to a command function F1(X) X-axis input end, via F1(X) is calculated at F1A Y axis of the (X) outputs a small valve opening instruction signal under a small valve 'non-small valve independent automatic mode', and the small valve opening instruction signal is transmitted to the selection module;
receiving the data from F at the same time when the selection module5(X) and F1And (X) when the output value is larger than the preset value, selecting and outputting according to the manual-automatic mode. When the small valve is in the ' small valve single automatic mode ', the small valve single automatic mode ' is obtained from F5(X) a numerical output; when the small valve is in the "non-small valve single automatic mode", the small valve is coming from F1And (X) outputting the numerical value. The output value of the selection module is transmitted to an automatic command interface of the small valve manual operator.
As shown in fig. 6, the tracking mode and automatic start-up sequence control unit 4 is triggered to realize automatic start-up operation by a pulse module and a delay module which are connected to four signals, i.e., automatic small valve start-up, manual small valve stop-up, manual large valve stop-up, and automatic large valve start-up, respectively. Besides, it also generates tracking signals for the regulator hand operator, the PI regulator. The signal triggered by the unit is called by other units or modules. The method is mainly used for entering the tracking mode before the automatic input, and entering the automatic mode again in the next second after the upstream and downstream instructions are consistent.
When the small valve is automatically switched, signals are respectively transmitted to the pulse module and the delay module simultaneously. The signal transmitted to the pulse module is immediately triggered into a 2-second pulse short tracking signal and is output to a small valve manual operator tracking mode interface and an OR gate input pin. And the signal transmitted to the delay module is delayed for 3 seconds and then output to generate a small valve operation automatic mode instruction signal and transmit the small valve operation automatic mode instruction signal to the small valve manual operator automatic mode interface.
When the large valve is automatically switched, signals are respectively transmitted to the pulse module and the delay module simultaneously. The signal transmitted to the pulse module is immediately triggered into a 2-second pulse short tracking signal and is output to a large valve manual operator tracking mode interface and an OR gate input pin. And the signal transmitted to the delay module is delayed for 3 seconds and then output to generate a large valve operation automatic mode instruction signal and transmit the large valve operation automatic mode instruction signal to the large valve manual operator automatic mode interface.
When the small valve is manually switched, the signal is transmitted to the pulse module to be immediately triggered into a 2-second pulse short tracking signal, and the 2-second pulse short tracking signal is output to an input pin of the OR gate.
When the big valve is switched manually, the signal is transmitted to the pulse module to be immediately triggered into a 2-second pulse short tracking signal, and the 2-second pulse short tracking signal is output to an input pin of the OR gate.
When the OR gate receives at least one 2-second pulse signal generated by the small valve operation automatic signal, the small valve switch manual signal, the large valve operation automatic signal and the large valve switch manual signal, the output of the OR gate generates a 2-second pulse short tracking signal of the regulator hand operator, and the 2-second pulse short tracking signal is transmitted to a tracking mode interface of the regulator hand operator.
When the signal of the manual regulator in the automatic state is '1', the manual regulator is directly converted into an instruction for starting automatic operation of the PI regulator and is transmitted to an automatic/tracking mode interface of the PI regulator, so that the PI regulator enters an automatic mode; when the signal of the manual regulator in the automatic state is '0', the manual regulator is directly converted into an instruction for starting tracking calculation of the PI regulator and is transmitted to an automatic/tracking mode interface of the PI regulator, so that the PI regulator enters a tracking mode.
Because the time difference of 1 second exists between the time triggered by the 2-second pulse signal and the time triggered by the 3-second delay signal, the time sequence control effect of entering the tracking mode first and then entering the automatic mode is generated.
As shown in FIG. 7, the undisturbed tracking value calculation unit 5 is based on
In the undisturbed tracking value calculation unit 5, F3(X) is a tracking value operation function in a non-small valve single automatic mode, and the mathematical expression of the function is y3＝0.4x、0≤x3≤40、0≤y3≤16；F6(X) is a tracking value operation function in the single automatic mode of the small valve, and the mathematical expression of the function is y6＝0.36x6、0≤x6≤100、0≤y6≤36；F4(X) is a function of the operation of the tracking value of the large valve, the mathematical expression of whichFormula is y4＝0.84x4、0≤x4≤100、0≤y4≤84。(x3、x6Opening degree command, x, both for small valves4Is the opening command of the big valve, y3Small valve tracking value, y, for "non-small valve individual automatic mode6Small valve tracking value, y, for "small valve individual automatic mode4A large valve tracking value).
The undisturbed tracking value calculating unit 5 comprises two adders, namely a first adder and a second adder, and comprises three selection modules, namely a first selection module (a small valve single automatic mode selection module), a second selection module (a large valve single automatic mode selection module) and a third selection module (a double valve automatic mode selection module);
when function module F3(X) receiving the output value from the small valve manual operator 1 to a command function F3(X) X-axis input end, via F3(X) is calculated at F3(X) outputting a small valve tracking value signal in a small valve "non-small valve independent automatic mode" to an inlet of the first adder on the Y-axis;
when function module F6(X) receiving the output value from the small valve manual operator 1 to a command function F6(X) X-axis input end, via F6(X) is calculated at F6(X) outputting a small valve tracking value signal under a small valve independent automatic mode by the Y axis, and transmitting the small valve tracking value signal to the inlet of the first selection module;
when function module F4(X) receiving the output value from the big valve manual operator 8 to the command function F4(X) X-axis input end, via F4(X) is calculated at F4The Y axis of the (X) outputs a tracking value signal of the large valve, and the tracking value signal of the large valve is respectively transmitted to inlets of the first adder and the second adder;
from F3(X) and F4The signal of (X) is operated by a first adder to form a tracking value signal in a double-valve automatic mode and is transmitted to a third selection module;
from F4(X) and the signal of the correction constant are calculated by a second adder to form a tracking value signal in a large valve independent automatic mode, and the tracking value signal is transmitted to a second selection module;
the correction constant is 0-200.
When the small valve is in the single automatic mode, the outputs of the three selection modules are: the first selection module selects and outputs the channel F6(X) the small valve tracking value signal in the small valve single automatic mode is calculated, the second selection module selects and outputs the output value of the first selection module, the third selection module selects and outputs the output value of the second selection module, namely the final output value is F6(X) a small valve tracking value signal in a "small valve individual automatic mode" of operation.
When the big valve is in the single automatic mode, the output of the three selection modules is that the first selection module selects the output value to be transmitted to the second selection module but not selected. The second selection module outputs the output value of the second adder (the tracking value signal in the large valve single automatic mode), and the third selection module selectively outputs the output value of the second selection module, namely the final output value is the tracking value signal in the large valve single automatic mode transported by the second adder.
When in the double-valve automatic mode, the output of the three selection modules is that when the first selection module and the second selection module select the output value to be transmitted to the third selection module, the output value is not selected. The third selection module outputs the output value of the first adder (tracking value signal in the double-valve automatic mode), i.e. the final output value is the tracking value signal in the large-valve single automatic mode transported via the second adder.
The output of the third selection module is a final tracking value signal which is transmitted to a tracking value interface of the manual regulator operator 7.
A disturbance-free tracking value calculating unit 5 for calling the output values of the small valve manual operator 1 and the large valve manual operator 8 and reusing the output values and the output values of the total valve position command distributing unit 31(X)、F2(X)、F5F with inverse operation relation of (X) three instruction function modules3(X)、F4(X)、F6And (X) three tracking function modules, a change-over switch, an adder, a correction constant and a mode signal for calling the valve use mode judging unit 2, and finally generating undisturbed tracking value calculation capable of being matched with respective modes. The unit calculates the generated undisturbed tracking valueFor the small valve manual operator 1 to call.
According to the above description, as shown in fig. 3:
in the automatic control mode, the automatic control command signal is from top to bottom, and the transmission process is as follows
Step 1: the PI regulator 6 receives the trigger tracking mode and puts into the automatic time sequence control unit 4 to generate a PI regulator automatic signal, immediately carries out the traditional PI operation according to the SP and PV values of the upstream logic, and the output end of the PI regulator 6 generates an automatic instruction signal in the automatic regulation mode and sends the automatic instruction signal to the regulator manual operator 7.
Step 2: the output end of the regulator hand operator 7 generates a command main valve position command signal output in an automatic mode, and the command main valve position command signal is sent to the main valve position command distribution unit 3 and the PI regulator 6 (for a tracking mode, and details of a signal transmission part of the tracking mode are described).
And step 3: the total valve position instruction distribution unit 3 receives the valve working mode signal generated by the valve use mode judgment unit 2 and the output instruction total valve position instruction signal of the regulator hand operator 7, calculates and generates an automatic control input instruction of the small valve hand operator 1 or the large valve hand operator 8, and sends the automatic control input instruction to the small valve hand operator 1 or the large valve hand operator 8.
And 4, step 4: the small valve hand operator 1 or the large valve hand operator 8 receives a signal for triggering the tracking mode and switching into the automatic mode from the valve generated by the automatic time sequence control unit 4 and a small valve hand operator 1 or a large valve hand operator 8 automatic control input command signal from the main valve position command distribution unit 3, the small valve hand operator 1 or the large valve hand operator 8 immediately enters the automatic mode, an output value is automatically controlled input command signal from the small valve hand operator 1 or the large valve hand operator 8 of the main valve position command distribution unit 3, and the final valve position command signal and the undisturbed tracking value calculation unit 5 (used for the tracking mode, and the tracking mode signal transmission part is used for detailed description) are output to the local equipment.
In tracking mode, the tracking signal and tracking value are more complex, but generally follow the principle from the top to the bottom, and are passed as follows:
step 1: when the small valve or the large valve is automatically operated, the operation signal simultaneously enters the valve use mode judging unit 2 and the trigger tracking mode and the input automatic time sequence control unit 4.
Step 2: the valve operation mode judging unit 2 immediately completes the judgment of the valve operation mode, generates a valve operation mode signal, and sends the valve operation mode signal to the total valve position instruction distributing unit 3 and the undisturbed tracking value calculating unit 5.
And step 3: the trigger tracking mode and the input automatic time sequence control unit 4 immediately generate a valve tracking signal and send the valve tracking signal to the small valve manual operator 1 or the large valve manual operator 8; generating a regulator hand operator tracking signal, and sending the signal to the regulator hand operator 7; a PI regulation auto/tracking signal is generated and sent to the PI regulator 6.
And 4, step 4: the small valve hand operator 1 or the large valve hand operator 8 receives a tracking signal generated by triggering the tracking mode and the switching automatic sequence control unit 4 and a signal for enabling the valve to enter the automatic mode, and also receives an automatic control input command signal of the small valve hand operator 1 or the large valve hand operator 8 from the main valve position command distribution unit 3. When the small valve manual operator 1 or the large valve manual operator 8 receives a tracking signal generated by triggering a tracking mode and switching into the automatic time sequence control unit 4, the small valve manual operator 1 or the large valve manual operator 8 immediately enters the tracking mode, a tracking value is an output value of the small valve manual operator 1 or the large valve manual operator 8 at the last moment and is output to a final valve position instruction signal of local equipment, and meanwhile, the final valve position instruction signal is also sent to the undisturbed tracking value calculation unit 5.
And 5: the undisturbed tracking value calculating unit 5 receives the valve working mode signal of the valve use mode judging unit 2 and the final valve position command signals of the small valve manual operator 1 and the large valve manual operator 8, calculates and generates a tracking value signal of the regulator manual operator, and sends the tracking value signal to the regulator manual operator 7.
Step 6: the regulator hand operator 7 receives a regulator hand operator tracking signal generated by the trigger tracking mode and the input automatic time sequence control unit 4 and a regulator hand operator tracking value signal generated by the undisturbed tracking value calculation unit 5, generates an output command total valve position command signal in the tracking mode of the regulator hand operator 7, and sends the output command total valve position command signal to the total valve position command distribution unit 3 and the PI regulator 6.
And 7: the PI regulator 6 receives a trigger tracking mode and puts into the automatic time sequence control unit 4 to generate a PI regulator tracking signal, immediately calls an output command main valve position command signal from the regulator hand operator 7, generates an output command in the PI regulator 6 tracking mode, and sends the output command to the regulator hand operator 7.
And 8: the total valve position instruction distribution unit 3 receives the valve working mode signal generated by the valve use mode judgment unit 2 and the output instruction total valve position instruction signal of the regulator hand operator 7, calculates and generates an automatic control input instruction of the small valve hand operator 1 or the large valve hand operator 8, and sends the automatic control input instruction to the small valve hand operator 1 or the large valve hand operator 8.
Although the steps 1 to 8 are described respectively, actually, mutual calling signals exist among the steps, all the signals are generated at almost the same time, and the final valve position instruction is tracked to the manual regulator and the PI regulator through the 8 steps, so that the purpose of undisturbed tracking is achieved.
Claims (12)
1. The deaerator liquid level control system based on time sequence control and inverse function operation comprises a PI regulator, a regulator manual operator and a big valve manual operator, wherein the PI regulator sends an automatic control valve position general instruction signal to the regulator manual operator, converts the automatic control valve position general instruction signal into a big valve automatic control input signal through the regulator manual operator and sends the big valve automatic control input signal to the big valve manual operator; the method is characterized in that:
the small valve manual operator is connected with the output end of the main valve position instruction distribution unit;
the undisturbed tracking value calculating unit is connected with the input end of the manual regulator;
two trigger tracking modes and an input automatic time sequence control unit, wherein one of the two trigger tracking modes is connected with the input end of the small valve manual operator, and the other trigger tracking mode is respectively connected with the input ends of the PI regulator, the regulator manual operator and the large valve manual operator;
the valve use mode judging unit is respectively connected with the total valve position instruction distributing unit, the triggering tracking mode connected with the input end of the small valve manual operator, and the input ends of the input automatic time sequence control unit and the undisturbed tracking value calculating unit;
the small valve manual operator sends an operation command to the small valve independently;
the valve use mode judging unit is used for judging the automatic working modes of the large valve and the small valve;
the main valve position instruction distribution unit is used for realizing the switching of different control ranges of a small valve independent automatic mode and a double valve automatic mode;
the trigger tracking mode and input automatic time sequence control unit is used for realizing the function of entering the tracking mode before the input is automatic and entering the automatic mode again in the next second after the upstream and downstream instructions are consistent;
and the undisturbed tracking value calculating unit is used for calculating tracking values in different modes.
2. The deaerator liquid level control system based on the time sequence control and the inverse function operation as claimed in claim 1, wherein: the valve use mode judging unit outputs 4 working modes of a large valve independent automatic mode, a small valve independent automatic mode, a double valve automatic mode and a double valve manual mode by calling the manual and automatic states of the large valve and the small valve and through logic judgment, and the judging signals of the 4 working modes can be called by other area units.
3. The deaerator liquid level control system based on the time sequence control and the inverse function operation as claimed in claim 2, wherein: the judgment signals of the 4 modes are respectively as follows:
when two conditions that the large valve is automatically put into the valve and the small valve is not automatically put into the valve are met, a signal of a single automatic mode of the large valve is output through the AND gate; when the two conditions that the small valve is automatically put into the valve and the large valve is not automatically put into the valve are met, a signal of a small valve independent automatic mode is output through the AND gate; when two conditions that the large valve is automatically put in and the small valve is also automatically put in are met, a signal of a double-valve automatic mode is output through the AND gate; when the two conditions that the large valve is not put into automation and the small valve is not put into automation are met, a signal of 'double-valve manual mode' is output through the AND gate.
4. The deaerator liquid level control system based on the time sequence control and the inverse function operation as claimed in claim 1, wherein: the total valve position instruction distribution unit outputs a large valve opening instruction signal, the large valve opening instruction signal is directly transmitted to an automatic instruction interface of a large valve manual operator, or the small valve independent automatic mode and the non-small valve independent automatic mode are selectively output according to the manual automatic mode at the moment, and the output value is transmitted to the automatic instruction interface of the small valve manual operator.
5. The deaerator liquid level control system based on the time sequence control and the inverse function operation as claimed in claim 4, wherein: the total valve position instruction distribution unit passes through a function module F2(X) outputting a large valve opening command signal; passing function module F1(X) and F5(X) performing selective output of both a small-valve individual automatic mode and a non-small-valve individual automatic mode; wherein, F1(X) is y1＝2.5x1、0≤x1≤16、0≤y1≤40；F5(X) is y5＝2.78x5、0≤x5≤36、0≤y5≤100；F2(X) is y2＝1.19(x2-16)、16≤x2≤100、0≤y2≤100；x1、x2And x5All the signals are valve position total instruction signals and y acquired by corresponding functions1Small valve opening command, y, for "non-small valve individual automatic mode5Small valve opening command, y, for "small valve individual automatic mode2I.e., the large valve opening command.
6. The deaerator liquid level control system based on the time sequence control and the inverse function operation as claimed in claim 1, wherein: the trigger tracking mode and input automatic time sequence control unit realizes input automatic operation by utilizing a pulse module and a delay module which are respectively connected with four signals of small valve input automatic, small valve switch manual, large valve switch manual and large valve input automatic, and generates tracking signals for a manual operator of the regulator and a PI regulator.
7. The deaerator liquid level control system based on the time sequence control and the inverse function operation of claim 6, wherein:
when the small valve is automatically switched, signals are respectively and simultaneously transmitted to the pulse module and the delay module, the signals transmitted to the pulse module are immediately triggered into 2-second pulse short tracking signals, the 2-second pulse short tracking signals are output to the tracking mode interface and the OR gate input pin of the small valve manual operator, the signals transmitted to the delay module are output after being delayed for 3 seconds, small valve switching automatic mode instruction signals are generated and are transmitted to the automatic mode interface of the small valve manual operator;
when the big valve is automatically switched, signals are respectively and simultaneously transmitted to the pulse module and the delay module, the signals transmitted to the pulse module are immediately triggered into 2-second pulse short tracking signals, the 2-second pulse short tracking signals are output to the big valve manual operator tracking mode interface and/or the gate input pin, the signals transmitted to the delay module are output after being delayed for 3 seconds, a big valve switching automatic mode instruction signal is generated and is transmitted to the big valve manual operator automatic mode interface;
when the small valve is manually switched, a signal is transmitted to the pulse module and immediately triggered into a 2-second pulse short tracking signal, and the 2-second pulse short tracking signal is output to an input pin of the OR gate;
when the big valve is switched manually, the signal is transmitted to the pulse module to be immediately triggered into a 2-second pulse short tracking signal, and the 2-second pulse short tracking signal is output to an input pin of the OR gate.
8. The deaerator liquid level control system based on the time sequence control and the inverse function operation of claim 7, wherein: when the OR gate receives at least one 2-second pulse signal generated by the small valve operation automatic signal, the small valve switch manual signal, the large valve operation automatic signal and the large valve switch manual signal, the output of the OR gate generates a 2-second pulse short tracking signal of the regulator hand operator, and the 2-second pulse short tracking signal is transmitted to a tracking mode interface of the regulator hand operator.
9. The deaerator liquid level control system based on the time sequence control and the inverse function operation of claim 8, wherein: when the signal of the manual regulator in the automatic state is '1', the manual regulator is directly converted into an instruction for starting automatic operation of the PI regulator and is transmitted to an automatic/tracking mode interface of the PI regulator, so that the PI regulator enters an automatic mode; when the signal of the manual regulator in the automatic state is '0', the manual regulator is directly converted into an instruction for starting tracking calculation of the PI regulator and is transmitted to an automatic/tracking mode interface of the PI regulator, so that the PI regulator enters a tracking mode.
10. The deaerator liquid level control system based on the time sequence control and the inverse function operation as claimed in claim 1, wherein: the undisturbed tracking value calculating unit comprises two adders, namely a first adder and a second adder, and comprises three selection modules which are respectively a first selection module, namely a small valve independent automatic mode selection module, a second selection module, namely a large valve independent automatic mode selection module, and a third selection module, namely a double valve automatic mode selection module; the undisturbed tracking value calculation unit respectively passes the output values of the small valve manual operator through a function module F3(X) and F6(X) operation, the output value of the big valve manual operator passes through a function module F4(X) calculating;
warp F3(X) calculating and outputting a small valve tracking value signal under the small valve non-small valve independent automatic mode, and transmitting the small valve tracking value signal to an inlet of a first adder;
warp F6(X) calculating and outputting a small valve tracking value signal under a small valve independent automatic mode, and transmitting the small valve tracking value signal to the inlet of the first selection module;
warp F4(X) calculating and outputting a large valve tracking value signal, and respectively transmitting the large valve tracking value signal to inlets of a first adder and a second adder;
F3(X) and F4The output signal of (X) is operated by a first adder to form a tracking value signal in a double-valve automatic mode and is transmitted to a third selection module;
F4(X) and the signal of the correction constant are calculated by a second adder to form a tracking value signal in a large valve independent automatic mode, and the tracking value signal is transmitted to a second selection module;
the output of the third selection module is a final tracking value signal which is transmitted to the tracking value interface of the manual operator of the regulator.
11. The oxygen remover liquid level control system based on time sequence control and inverse function operation of claim 10, wherein:
when the small valve is in the single automatic mode, the outputs of the three selection modules are: the first selection module selects and outputs the channel F6(X) the small valve tracking value signal in the small valve single automatic mode is calculated, the second selection module selects and outputs the output value of the first selection module, the third selection module selects and outputs the output value of the second selection module, namely the final output value is F6(X) a small valve tracking value signal in a "small valve individual automatic mode" of operation;
when the big valve is in the single automatic mode, the outputs of the three selection modules are: the first selection module selects the output value to be transmitted to the second selection module, but the output value is not selected, the second selection module outputs the output value of the second adder, namely the tracking value signal in the large valve single automatic mode, and the third selection module selects the output value of the second selection module, namely the final output value is the tracking value signal in the large valve single automatic mode transported by the second adder;
when the output values of the three selection modules are transmitted to the third selection module but are not selected, the third selection module outputs the output value of the first adder, namely the tracking value signal in the double-valve automatic mode, and the final output value is the tracking value signal in the large-valve single automatic mode transported by the second adder.
12. The deaerator liquid level control method based on the time sequence control and the inverse function operation is characterized in that the deaerator liquid level control system based on the time sequence control and the inverse function operation is utilized to carry out the following operations:
step 1) when a small valve or a large valve is automatically operated, an operation signal simultaneously enters a valve use mode judging unit 2 and a triggering tracking mode and switching automatic time sequence control unit;
step 2) the valve use mode judging unit immediately finishes the judgment of the valve working mode, generates a valve working mode signal and sends the valve working mode signal to the total valve position instruction distributing unit and the undisturbed tracking value calculating unit;
step 3) triggering a tracking mode and putting into an automatic time sequence control unit to immediately generate a valve tracking signal, and sending the valve tracking signal to a small valve manual operator or a large valve manual operator; generating a tracking signal of the regulator hand operator, and sending the tracking signal to the regulator hand operator; generating a PI regulation automatic/tracking signal, and sending the PI regulation automatic/tracking signal to a PI regulator;
step 4) the small valve manual operator or the large valve manual operator receives a tracking signal generated by triggering a tracking mode and switching into an automatic time sequence control unit and a signal for the valve to enter an automatic mode, and also receives a small valve manual operator or a large valve manual operator automatic control input instruction signal from a main valve position instruction distribution unit; when the small valve manual operator or the large valve manual operator receives a tracking signal generated by triggering a tracking mode and putting into an automatic time sequence control unit, the small valve manual operator or the large valve manual operator immediately enters the tracking mode, a tracking value is a last-moment output value of the small valve manual operator or the large valve manual operator and is output to a final valve position instruction signal of local equipment, and meanwhile, the final valve position instruction signal is also sent to a non-interference tracking value calculation unit;
step 5) receiving the valve working mode signal of the valve use mode judging unit and the final valve position instruction signal of the small valve manual operator and the large valve manual operator by the undisturbed tracking value calculating unit, calculating and generating a tracking value signal of the regulator manual operator, and sending the tracking value signal to the regulator manual operator;
step 6) the regulator hand operator receives a regulator hand operator tracking signal generated by a trigger tracking mode and an input automatic time sequence control unit and a regulator hand operator tracking value signal of a undisturbed tracking value calculation unit, generates an output instruction total valve position instruction signal in the regulator hand operator tracking mode, and sends the output instruction total valve position instruction signal to a total valve position instruction distribution unit and a PI regulator;
step 7) the PI regulator receives a trigger tracking mode and puts into an automatic time sequence control unit to generate a PI regulator tracking signal, an output instruction total valve position instruction signal from the regulator manual operator is called immediately, an output instruction in the PI regulator tracking mode is generated, and the output instruction is sent to the regulator manual operator;
and 8) receiving the valve working mode signal generated by the valve use mode judging unit and the output instruction total valve position instruction signal of the regulator manual operator by the total valve position instruction distributing unit, calculating and generating an automatic control input instruction of the small valve manual operator or the large valve manual operator, and transmitting the automatic control input instruction to the small valve manual operator or the large valve manual operator.
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