CN101872159A - Temperature and pressure reducer control system and control method thereof - Google Patents
Temperature and pressure reducer control system and control method thereof Download PDFInfo
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- CN101872159A CN101872159A CN201010171662A CN201010171662A CN101872159A CN 101872159 A CN101872159 A CN 101872159A CN 201010171662 A CN201010171662 A CN 201010171662A CN 201010171662 A CN201010171662 A CN 201010171662A CN 101872159 A CN101872159 A CN 101872159A
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Abstract
The invention provides a temperature and pressure reducer control system and a control method thereof. The control system comprises a pressure transmitter and a regulating valve, wherein the regulating valve is connected with an electric motor; an I/A system is connected between the pressure transmitter and the electric motor; the inside of the I/A system is provided with a control unit; and the control unit is provided with an input module for receiving pressure signals, an output module used for outputting control signals and a fuzzy control module which contains a pressure difference computing module used for receiving the output data of the input module and an inference engine module used for receiving the output data of the pressure difference computing module. The method comprises the following steps: after the input module receives a pressure signal, the pressure data are transmitted to the pressure difference computing module, the pressure difference computing module calculates pressure difference, fuzzifies the pressure difference and outputs the pressure difference to the inference engine module, and the inference engine module outputs a controlling value. The method of the invention adopts the fuzzy control mode to control the regulating valve of the temperature and pressure reducer, thus the output steam pressure of the temperature and pressure reducer can be fast and stably controlled.
Description
Technical field
The present invention relates to a kind of control system of temperature-decreased pressure reducer, especially use the temperature-decreased pressure reducer control system of fuzzy control and the control method of this control system.
Background technology
Often need to use the steam of certain pressure intensity in the tow production run, as use 3.5 kilograms/square centimeter steam, the pressure of steam requires to be controlled between the 0.34-0.40 MPa.Use the mode of two back pressure turbine air feed arranged side by side to move in more existing production procedures, but the resource that consumes is bigger.In order to realize the purpose of energy-saving and emission-reduction, raising equipment service efficiency, need the work of a back pressure turbine unit operation pattern in the production procedure, but a steam turbine unit operation can cause the vapor pressure fluctuation bigger, therefore need to use a temperature-decreased pressure reducer and steam turbine paired running, to regulate the vapor pressure of output.The steam supply system that uses a back pressure turbine and a temperature-decreased pressure reducer paired running as shown in Figure 1.
Referring to Fig. 1, the back pressure turbine 2 level supply of equipment backward of flowing through of the steam part of steam supply equipment 1 output, the air intake opening of steam turbine 2 is provided with a variable valve 5 outward, can change the quantity of steam that flows to steam turbine 2 by the aperture of regulating variable valve 5, thereby change the air pressure of steam turbine 2 output steam.Be provided with a pressure unit 3 outside steam turbine 2 gas outlets, be used to detect the vapor pressure of steam turbine 2 outputs, and the pressure signal that detects is transferred in I/A (the Foxboro company Distributed Control System (DCS)) system 4.Be provided with control module in the I/A system 4, export control signals to motor 6, regulate the aperture of variable valve 5 by the rotation of motor 6 according to the pressure signal of pressure unit 3 transmission.
Because the vapor pressure of exporting during steam turbine 2 unit operations has than great fluctuation process, therefore need a temperature-decreased pressure reducer 12 and steam turbine 2 paired runnings, use temperature-decreased pressure reducer 12 to regulate the air pressure of output steam.
The air intake opening of temperature-decreased pressure reducer 12 also is provided with a variable valve 15 outward, and is provided with pressure unit 13 outside temperature-decreased pressure reducer 12 gas outlets, is used to detect the pressure of temperature-decreased pressure reducer 12 output steam.Pressure unit 13 is sent to I/A system 14 with detected pressure signal, is provided with control module in the I/A system 14, and control module is exported control signals according to the pressure signal that pressure unit 13 detects to motor 16.Motor 16 is electrically connected with variable valve 15, and to the aperture of variable valve 15 output current signals with regulating and controlling valve 15, thereby regulate the pressure that temperature-decreased pressure reducer 12 is exported steam.
Control module in the I/A system 14 includes a load module and an output module, is provided with a pid control module between load module and output module, and the therefore existing PID that is controlled to be to temperature-decreased pressure reducer 12 controls.After load module receives the pressure signal of pressure unit 13 outputs, be converted into digital signal, and be sent to pid control module, regulate the back to the output module output data by PID, output module becomes corresponding current signal according to the data-switching that is received, and exporting motor 16 to, motor 16 is regulated the aperture of variable valve 15 under the effect of current signal.
But, because can only carrying out fast and stable ground near the pressure surge interior very among a small circle set point, regulates pid control module, for example near 0.37 MPa, the pressure of temperature-decreased pressure reducer 12 output is regulated in very among a small circle, when temperature-decreased pressure reducer 12 output vapor pressure fluctuation ratios are violent, pid control module then can't promptly be regulated temperature-decreased pressure reducer 12, cause the vapor pressure fluctuation bigger, can't satisfy back level equipment work needs.
Summary of the invention
Fundamental purpose of the present invention provides the temperature-decreased pressure reducer control system that a kind of energy fast and stable ground is regulated temperature-decreased pressure reducer output vapor pressure.
Another object of the present invention provides a kind of temperature-decreased pressure reducer control method of using above-mentioned control system.
For realizing above-mentioned fundamental purpose, temperature-decreased pressure reducer control system provided by the invention comprises the pressure unit that detects the temperature-decreased pressure reducer output gas pressure, be arranged on the outer variable valve of temperature-decreased pressure reducer air intake opening, variable valve is connected with a motor, motor is used to regulate the aperture of variable valve, be connected with the I/A system between pressure unit and the motor, be provided with control module in the I/A system, control module is provided with: the load module that receives the pressure signal of pressure unit output, output module to motor output control signal, wherein, control module also is provided with the fuzzy control module, the fuzzy control module comprises: receive the pressure difference value computing module of load module output data, pressure difference value computing module internal memory contains pressure set points; And the inference machine module that receives pressure difference value computing module output data, the inference machine module stores has the fuzzy control rule data.
By such scheme as seen, the control module of temperature-decreased pressure reducer control system is provided with the fuzzy control module, and promptly the aperture of variable valve is used FUZZY ALGORITHMS FOR CONTROL control.Because FUZZY ALGORITHMS FOR CONTROL requires lower to the controlling object model, and response is very fast, FUZZY ALGORITHMS FOR CONTROL is carried out Fuzzy processing to the data of input, and control according to the input data after the obfuscation, it does not have harsh requirement to the input data area, even the vapor pressure fluctuation of temperature-decreased pressure reducer output is bigger, the fuzzy control module also can go out suitable controlling value according to the data of importing to the fuzzy control rule data computation apace, can regulate fast and effectively variable valve.
A preferred scheme is that the fuzzy control module also comprises the pressure change rate computing module to inference machine module output pressure rate of change data.Like this, the not single working pressure difference of fuzzy control module is gone back the working pressure rate of change and is set up fuzzy set as input parameter as input parameter, realizes two-dimentional fuzzy control, and the control effect is even more ideal.
Further scheme is, the fuzzy control module also comprises the pressure change rate amplification module that receives the load module output data, and the pressure change rate amplification module is to pressure change rate computing module output data.
Because one is less for the data of pressure change rate, therefore the pressure change rate data need be input to the pressure change rate computing module after amplifying, and can guarantee that the pressure change rate data are more accurate, improves the control effect.
For realizing another above-mentioned purpose, after the present invention uses the control method of above-mentioned control system to comprise that load module receives the pressure signal of pressure unit output, pressure data is transferred to the pressure difference value computing module, the pressure difference value computing module calculates the difference data between actual pressure value and the pressure set points, and to the inference machine module will be exported after the difference data obfuscation, the inference machine module is according to the difference data and the fuzzy control rule data computation of input and export controlling value, and output module will be exported controlling value and export motor to after simulated.
By such scheme as seen, input to the pressure difference value computing module after the pressure signal obfuscation of fuzzy control module with input, even the vapor pressure fluctuation of temperature-decreased pressure reducer output is bigger, the fuzzy control module is effective calculating pressure difference still, and calculate suitable controlling value apace, variable valve is controlled fast and effectively, thereby regulated the vapor pressure that temperature-decreased pressure reducer is exported apace.
Further scheme is, the temperature-decreased pressure reducer control system also has the pressure change rate computing module to inference machine module output pressure rate of change data, after the pressure change rate computing module receives the pressure signal of load module output, calculating pressure change rate signal data, and will input to the inference machine module after the pressure change rate data obfuscation.
This shows that fuzzy control module working pressure difference and pressure change rate use two-dimentional fuzzy control to control temperature-decreased pressure reducer output vapor pressure more accurately and efficiently as fuzzy control parameter, improve control of quality.
Description of drawings
Fig. 1 is the structural representation block diagram of existing steam supply system.
Fig. 2 is the control loop schematic block diagram of control system embodiment of the present invention.
Fig. 3 is the structured flowchart of control module among the control system embodiment of the present invention.
Fig. 4 is the process flow diagram of control method embodiment of the present invention.
The invention will be further described below in conjunction with drawings and Examples.
Embodiment
Temperature-decreased pressure reducer control system of the present invention comprises the variable valve that is positioned at the temperature-decreased pressure reducer air intake opening, be useful on the pressure unit that detects vapor pressure at temperature-decreased pressure reducer gas outlet peripheral hardware, the pressure signal that pressure unit detects is sent in the I/A system, be provided with control module in the I/A system, can export control signal to motor according to the pressure signal that detects, motor rotates under the driving of control signal, thereby drive the variable valve rotation, change the aperture of variable valve, and then change the vapor pressure of temperature-decreased pressure reducer output.
Referring to Fig. 2, the intrasystem control module of I/A of the present invention includes pid control module 26 and fuzzy control module 30, and pid control module 26 is selected a ground with module controls module 30 variable valve 15 is controlled.
In the present embodiment, behind pid control module 26 and the fuzzy control module 30 selector switch 17 is set, one end of selector switch 17 is to variable valve 15 output control signals, the other end is selected the control signal that a ground receives pid control module 26 or 30 outputs of fuzzy control module, and selector switch 17 concrete principle of work will be discussed later.
Referring to Fig. 3, the intrasystem control module of I/A of the present invention comprises load module 21, pressure difference value computing module 22, pressure change rate amplification module 23, pressure change rate computing module 24, inference machine module 25, pid control module 26, no disturbance handover module 27 and output module 28, and wherein pressure difference value computing module 22, pressure change rate amplification module 23, pressure change rate computing module 24 and inference machine module 25 are formed the fuzzy control module 30 of present embodiment.
Load module 21 receives the pressure signal that pressure units transmit, and is sent to pressure difference value computing module 22, pressure change rate amplification module 23 and pid control module 26 after the pressure signal of simulation is converted into digital signal.
Pressure difference value computing module 22 internal memories contain a pressure predetermined value, and calculate the pressure actual value of load module input and the difference between the pressure set points, simultaneously the pressure difference value that calculates are carried out obfuscation.For example, the domain that pressure difference value is set in the pressure difference value computing module for 0.015 ,-0.005,0 ,+0.005 ,+0.015}, then the fuzzy set of pressure difference value is: e (t)=negative big, negative little, zero, just little, honest={ NB, NS, ZO, PS, PB} so promptly realizes the obfuscation of pressure difference value.Pressure difference value computing module 22 exports the pressure difference value data after the obfuscation in the inference machine module 25 to.
As seen, when the difference between pressure actual value and the pressure predetermined value during greater than 0.015 MPa, it is NB or PB that the pressure difference value computing module then calculates the pressure difference value input parameter, under the violent situation of pressure surge, still can obtain fuzzy parameter apace.
Pressure change rate amplification module 23 receives the data of load modules input, and pressure difference value is carried out differential handle and obtain the pressure change rate data.In the present embodiment, the cycle period of pressure change rate amplification module 23 is 1 second, thus the pressure change rate data one is less, be not easy to embody pressure variety, therefore need carry out processing and amplifying to pressure.In the present embodiment, the pressure change rate amplification module amplifies 3600 times to the pressure change rate data, to embody the variation of vapor pressure.The domain of pressure change rate data be 6.5 ,-1.5,0 ,+2.0 ,+6.5}.
The pressure change rate data exported pressure change rate computing module 24 to after pressure change rate amplification module 23 will calculate the amplification that obtains, pressure change rate computing module 24 is with its obfuscation, and its fuzzy set is: Δ e (t)={ negative big, negative little, zero, just little, honest }={ NB, NS, ZO, PS, PB}, and the data after the obfuscation are sent to inference machine module 25.
Inference machine module 25 internal memories contain the fuzzy set of output controlling value, promptly export fuzzy set and are: Δ U (t)={ negative big, negative little, zero, just little, honest }=NB, NS, ZO, PS, PB}, the domain of Δ U (t) be 0.8 ,-0.3,0 ,+0.3 ,+0.8}.
And, inference machine module 25 also stores the fuzzy control rule data: Rule 1:IF e is PB and Δ e is PB THEN Δ U is NBRule 2:IF e is PS and Δ e is PB THEN Δ U is NBRule 3:IF e is ZO and Δ e is PB THEN Δ U is NB ... after inference machine module 25 receives the pressure difference value and pressure change rate data of pressure difference value computing module 22 and 24 outputs of pressure change rate computing module, according to the corresponding output valve of fuzzy control rule data computation, and output valve exports no disturbance handover module 27 to as controlling value.
For control module can more stably be regulated variable valve, pid control module 26 also is set in the present embodiment, pid control module 26 receives the data of load module output, after regulating by PID, to no disturbance handover module 27 output control datas.
No disturbance handover module 27 is equivalent to the selector switch 17 among Fig. 2, and it selects the data that a ground receives pid control module 26 or 25 outputs of inference machine module, and the data of output are sent in the output module 28.Simultaneously, no disturbance handover module 27 is exported the output data of himself to pid control module 26 and inference machine module 25, thereby the no disturbance that realizes PID control and fuzzy control is switched.
Under the PID control model, no disturbance handover module 27 receives the control data of pid control module 26 outputs.If the PID control model need be switched to Fuzzy Control Model, then there is not disturbance handover module 27 to pid control module 26 output signals, make pid control module 26 force automatically, force to follow the tracks of, and do not have disturbance handover module 27 and export self output data to pid control module 26.Like this, under Fuzzy Control Model, the output data that the output data of pid control module 26 will be followed no disturbance handover module 27 changes.
When switching back the PID control model from Fuzzy Control Model, because following no disturbance handover module 27 always, the output of pid control module 26 changes, therefore moment pid control module 26 the output data that can guarantee patterns of change does not have jumping characteristic and changes, thereby realizes no disturbance switching.
Similarly, no disturbance handover module 27 also exports the output data of self to inference machine module 25, the data of no disturbance handover module 27 outputs of inference machine module 25 uses this moment make the output valve of inference machine module 25 follow no disturbance handover module 27 output datas variation as input parameter.When the PID control model switches to Fuzzy Control Model, also can realize not having disturbance and switch, avoid the controlling value jumping characteristic of inference machine module 25 outputs to change.
Output module 28 receives the controlling value of no disturbance handover module 27 outputs, and with output controlling value convert corresponding simulating signal to, as current signal, and export simulating signal to motor, the aperture that motor is regulated variable valve according to current signal, thus the pressure that temperature-decreased pressure reducer is exported steam changed.
Referring to Fig. 4, using under the Fuzzy Control Model, load module 21 receives the pressure signal of pressure units input, and converts the pressure signal of simulation to digital signal and export pressure difference value computing module 22, pressure change rate amplification module 23 and pid control module 26, i.e. execution in step S1 to.
After pressure difference value computing module 22 receives pressure data, the difference between calculating pressure actual value and the pressure predetermined value, and will be sent to inference machine module, i.e. execution in step S2 after the pressure difference value obfuscation.
Simultaneously, after pressure change rate amplification module 23 receives pressure datas, calculating pressure rate of change data, and export pressure change rate computing module 24 to after will the pressure change rate data amplifying, i.e. execution in step S3.
After pressure change rate computing module 24 receives the pressure change rate data of pressure change rate amplification module 23 outputs, inference machine module 25, i.e. execution in step S4 will be sent to after its obfuscation.
Then, inference machine module 25 is according to data that received and the suitable controlling value of fuzzy control rule data computation, and controlling value is exported in the no disturbance handover module 27, i.e. execution in step S5.After no disturbance handover module 27 receives controlling value, to output module 28 output corresponding output data, i.e. execution in step S6.
At last, output module 28 becomes corresponding current signal to export motor to according to the data-switching that receives, i.e. execution in step S7.
Certainly, if under the PID control model, pid control module 26 receives the data of load modules 21, and according to the PID control law to no disturbance handover module 27 output datas.Before PID control model and Fuzzy Control Model switching, no disturbance switches fuzzy 27 will guarantee the no disturbance of switching to the output data of pid control module 26 or inference machine module 25 outputs self.
Because control valve opening changes when 0-10% changes, change small to steam flow, therefore need in no disturbance handover module 27, increase limitation function, force no disturbance handover module 27 output control valve openings to change between 10%-100%, regulate the aperture of variable valve effectively.
Because temperature-decreased pressure reducer control system of the present invention uses fuzzy control method that variable valve is controlled, and the characteristics that fuzzy control has is low to the requirement of controlling object model, response is fast, even the fluctuation of temperature-decreased pressure reducer output vapor pressure is violent, also can fast and stable ground be regulated by vapor pressure, to satisfy the tow production requirement.
Certainly, such scheme only is the preferable embodiment of the present invention, during practical application, more conversion can also be arranged, and for example cancels the pressure change rate amplification module, and the data of load module output directly export the pressure change rate computing module to; Perhaps, the fuzzy control module is the one dimension fuzzy control, and promptly only the working pressure difference is as input parameter etc., and these change does not influence enforcement of the present invention.
Claims (10)
1. the temperature-decreased pressure reducer control system comprises
Detect the pressure unit of temperature-decreased pressure reducer output gas pressure;
Be arranged on the outer variable valve of described temperature-decreased pressure reducer air intake opening, described variable valve is connected with a motor, and described motor is used to regulate the aperture of described variable valve;
Be connected with the I/A system between described pressure unit and the described motor, be provided with control module in the described I/A system, described control module is provided with:
Receive the load module of the pressure signal of described pressure unit output;
Output module to described motor output control signal;
It is characterized in that:
Described control module also is provided with the fuzzy control module, and described fuzzy control module comprises:
Receive the pressure difference value computing module of described load module output data, described pressure difference value computing module internal memory contains pressure set points;
Receive the inference machine module of described pressure difference value computing module output data, described inference machine module stores has the fuzzy control rule data.
2. temperature-decreased pressure reducer control system according to claim 1 is characterized in that:
Described fuzzy control module also comprises the pressure change rate computing module to described inference machine module output pressure rate of change data.
3. temperature-decreased pressure reducer control system according to claim 2 is characterized in that:
Described fuzzy control module also comprises the pressure change rate amplification module that receives described load module output data, and described pressure change rate amplification module is to described pressure change rate computing module output data.
4. according to each described temperature-decreased pressure reducer control system of claim 1 to 3, it is characterized in that:
Described control module also comprises the pid control module that receives described input block output data.
5. temperature-decreased pressure reducer control system according to claim 4 is characterized in that:
Described control module also comprises no disturbance handover module, and described no disturbance handover module receives the data of described inference machine module or described pid control module output, and to the output data of described inference machine module and described pid control module input feedback.
6. use the control method of temperature-decreased pressure reducer control system according to claim 1, comprise
After described load module receives the pressure signal of described pressure unit output, pressure data is sent to described pressure difference value computing module, described pressure difference value computing module calculates the difference data between actual pressure value and the described pressure set points, and to described inference machine module will be exported after the described difference data obfuscation, described inference machine module is according to the difference data and the described fuzzy control rule data computation of input and export controlling value, and described output module will be exported controlling value and export described motor to after simulated.
7. temperature-decreased pressure reducer control method according to claim 6 is characterized in that:
Described temperature-decreased pressure reducer control system also has the pressure change rate computing module to described inference machine module output pressure rate of change data;
After described pressure change rate computing module receives the pressure signal of described load module output, calculating pressure change rate signal data, and will input to described inference machine module after the described pressure change rate data obfuscation.
8. temperature-decreased pressure reducer control method according to claim 6 is characterized in that:
Described fuzzy control module also comprises pressure change rate amplification module that receives the load module output data and the pressure change rate computing module that receives described pressure change rate amplification module output data;
After described pressure change rate amplification module receives the pressure signal of described load module output, calculating is also amplified the pressure change rate data and is exported described pressure change rate computing module to, exports described inference machine module to after the pressure change rate data obfuscation after described pressure change rate computing module will amplify.
9. according to each described temperature-decreased pressure reducer control method of claim 6 to 8, it is characterized in that:
Described control module also comprises the pid control module that receives described input block output data and does not have the disturbance handover module;
After described no disturbance handover module receives the data of described inference machine module or the output of described pid control module, the data of self exporting are fed back to described inference machine module and described pid control module, and export the data of self exporting to described output module.
10. temperature-decreased pressure reducer control method according to claim 9 is characterized in that:
Described no disturbance handover module data to described output module output when the selection fuzzy control are more than or equal to 10%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105370959A (en) * | 2015-12-24 | 2016-03-02 | 河南华润电力首阳山有限公司 | Method and device for adjusting nonlinearity degree of valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105370959A (en) * | 2015-12-24 | 2016-03-02 | 河南华润电力首阳山有限公司 | Method and device for adjusting nonlinearity degree of valve |
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Open date: 20101027 |