CN113138590B - Logic system for improving temperature quality judgment reliability of DCS (distributed control system) - Google Patents
Logic system for improving temperature quality judgment reliability of DCS (distributed control system) Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/41845—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by system universality, reconfigurability, modularity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/33—Director till display
- G05B2219/33273—DCS distributed, decentralised controlsystem, multiprocessor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention provides a logic system for improving the temperature quality judgment reliability of a DCS, which comprises: the output end of the monitoring relay is connected with the S input end of the set priority trigger, the output end of the first comparison operation module is connected with one input end of the OR operation module, the output end of the undisturbed retaining module is sequentially connected with the first subtraction module, the absolute value module, the second comparison operation module and the non-operation module, the output end of the non-operation module is connected with the R input end of the set priority trigger, the output end of the set priority trigger is connected with the other input end of the OR operation module and the control end of the undisturbed retaining module, or the output end of the operation module is connected with the temperature quality judgment interface. The invention has the advantages that: only when the temperature data is restored to a value close to the value before the temperature mutation, the temperature is restored to the original level, the reset output of the set priority trigger is carried out, and the reliability of temperature quality judgment is logically improved.
Description
Technical Field
The invention relates to application of a DCS (distributed control system), in particular to a logic system for improving the temperature quality judgment reliability of the DCS.
Background
The distributed control system is called DCS for short, and can also be translated into a distributed control system or a distributed computer control system. The system adopts the basic design idea of control dispersion, operation and management centralization, adopts a structural form of multilayer classification and cooperative autonomy, is a product combining the computer technology, the communication technology and the graphic display in the control technology, and is a brand-new distributed computer control system for carrying out centralized monitoring, operation, management and dispersion on the production process by utilizing the computer technology. DCS is widely applied to various industries such as electric power, metallurgy, petrochemical industry and the like at present. The software system of the DCS provides quite abundant functional software modules and functional software packages for users, and control engineers use configuration software provided by the DCS to carry out appropriate 'assembly connection' on various functional software so as to generate various application software meeting the requirements of a control system.
Fig. 1 is a schematic diagram of a conventional DCS system for determining temperature and quality; the output terminal of the monitoring relay 90 is connected to the R input terminal of the set priority flip-flop 100, an input terminal of the or operation module 110, and an input terminal of the first non-operation module 151, the output terminal of the first non-operation module 151 is connected to the input terminal of the fifth delay module 25, and the output terminal of the fifth delay module 25 is connected to the S input terminal of the set priority flip-flop 100.
The working principle of fig. 1: the temperature data of the externally detected temperature element enters the temperature data input interface 181, passes through the second analog quantity switching module 12, the third delay module 23, the four dead time modules (31, 32, 33, 34), the arithmetic mean module 40, the linear function module 50, and enters the lower input end of the first analog quantity switching module 11; when the set priority flip-flop 100 outputs "1", the first analog quantity switching module 11 outputs data at the upper input end, that is, keeps output data unchanged; when the set priority flip-flop outputs "0", the first analog quantity switching module 11 outputs data of the lower input terminal. The value delayed by 1.5 seconds from the third delay module 23 passes through the fourth subtraction module 64 and enters the upper input end of the first division module 71; the result value of the multiplication module 80 enters the lower input end of the first division module 71; the value of the upper input end of the first division module 71 is divided by the value of the lower input end thereof, the obtained result is transmitted to the upper input end of the monitoring relay 90 and the first delay module 21, the first delay module 21 delays for 1 second and then transmits to the lower input end of the monitoring relay 90, and the value before 1 second and the value after 1 second are judged in the monitoring relay 90, that is, the judgment of the temperature change rate, for example, if the temperature rises for more than 5 degrees centigrade per second (the temperature drops without a limit), the temperature element is considered to be an abnormal fault; if there is no abnormality, the monitor relay 90 outputs a signal "0"; if there is an abnormality, the monitoring relay 90 outputs a signal "1" to the S input terminal of the set priority flip-flop 100, and the set priority flip-flop 100 outputs the signal "1" to the first analog quantity switching module 11, so that the output of the first analog quantity switching module 11 maintains the last value; the output signal "1" of the monitoring relay 90 is also inverted by the first non-operation module 151 to become a signal "0", and after 0.3 second delay of the fifth delay module 25, the signal "0" enters the R input end of the set priority flip-flop 100, so that the set priority flip-flop 100 resets and outputs the signal "0"; the monitoring relay 90 further outputs a signal "1" to the or operation module 110, and the result obtained by the first division operation module 71 is further transmitted to the first comparison operation module 131, so as to perform temperature overrun judgment, for example, whether the temperature exceeds 105 ℃ or is lower than 0.5 ℃, and if the temperature is not overrun, the first comparison operation module 131 outputs a signal "0"; if the temperature exceeds the limit, the first comparing operation module 131 outputs a signal "1", and the first comparing operation module 131 outputs the judgment result to the or operation module 110; if the or operation module 110 outputs "1" to the temperature quality determination interface 183, it indicates that the temperature quality is a dead spot, and if the or operation module 110 outputs "0" to the temperature quality determination interface 183, it indicates that the temperature quality is not a dead spot.
This existing DCS system has the following disadvantages: the output signal of the monitoring relay is subjected to inversion processing and then delayed for 0.3 second and then is transmitted to the R input end of the set priority trigger for resetting, the temperature actually detected outside on site suddenly changes to a higher value and is kept for more than 0.3 second, and the set priority trigger automatically resets for 0.3 second, so that the wrong higher value of the temperature is judged to be a reliable signal and is transmitted from the temperature data output interface, and therefore protection misoperation is caused. One of the factors of the or operation module for judging whether the temperature quality is a dead point is the judgment result of the monitoring relay on the temperature change rate.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a logic system for improving the temperature quality judgment reliability of a DCS, and the time delay automatic resetting mode of a position priority trigger in the background technology is replaced to improve the temperature quality judgment reliability of the DCS.
The invention is realized by the following steps: a logic system for improving the reliability of temperature quality judgment of a DCS comprises:
the temperature data providing end is connected with the upper input end of the monitoring relay, the input end of the first delay module, the input end of the first comparison operation module, the input end of the second delay module, the lower input end of the first subtraction module, the output end of the first delay module is connected with the lower input end of the monitoring relay, the output end of the monitoring relay is connected with the S input end of the set priority trigger, the output end of the first comparison operation module is connected with one input end of the OR operation module, the output end of the second delay module is connected with the input end of the undisturbed maintaining module, the output end of the undisturbed maintaining module is connected with the upper input end of the first subtraction module, the output end of the first subtraction module is connected with the input end of the absolute value module, the output end of the absolute value module is connected with the input end of the second comparison operation module, the output end of the second comparison operation module is connected with the input end of the non-operation module, the output end of the non-operation module is connected with the R input end of the set priority trigger, the output end of the set priority trigger is connected with the other input end of the OR operation module, the control end of the undisturbed maintaining module, or the output end of the operation module is connected with the temperature quality judging interface.
Further, the method also comprises the following steps:
the temperature data input interface is connected with the input end of a third delay module, the output end of the third delay module is connected with the upper input end of a first division module and the input ends of a plurality of invalid time modules, the output ends of the invalid time modules are connected with the input ends of an arithmetic averaging module in a one-to-one correspondence manner, the output end of the arithmetic averaging module is connected with the input end of a linear function module, the output end of the linear function module is connected with the lower input end of a first analog quantity switching module, the output end of the first analog quantity switching module is connected with the upper input end of the first analog quantity switching module and a temperature data output interface, the output end of a setting priority trigger is further connected with the control end of the first analog quantity switching module, a first constant signal generator is connected with the input end of a multiplication module, the output end of the multiplication module is connected with the lower input end of the first division module, and the output end of the first division module is the temperature data supply end.
Further, still include:
the output end of the third delay module is further connected with the lower input end of the second subtraction module, the output end of the arithmetic mean module is further connected with the input end of the fourth delay module, the output end of the fourth delay module is connected with the upper input end of the second subtraction module, the output end of the second subtraction module is connected with the upper input end of the second division module, the output end of the multiplication module is further connected with the lower input end of the second division module, the output end of the second division module is connected with the input end of the third comparison operation module, the output end of the third comparison operation module is connected with the input end of the non-operation module, and the output end of the non-operation module is connected with the control ends of the plurality of invalid time modules.
Further, still include:
the output end of the second analog quantity switching module is connected with the input end of the third delay module, the lower input end of the second analog quantity switching module is connected with the temperature data input interface, the upper input end of the second analog quantity switching module is connected with the test data input interface, and the control end of the second analog quantity switching module is connected with the first setting number adjusting module.
Further, still include:
the second number setting adjusting module is connected with the control end of the first delay module, the control end of the third delay module and the control end of the fourth delay module.
Further, still include:
the second constant signal generator is connected with the lower input end of the third subtraction module and the lower input end of the fourth subtraction module, the output end of the third delay module is further connected with the upper input end of the fourth subtraction module, the output end of the fourth subtraction module is connected with the upper input end of the first division module, the first constant signal generator is connected with the upper input end of the third subtraction module, and the output end of the fourth subtraction module is connected with the input end of the multiplication module.
Further, still include:
the input end of the temperature protection logic operation module is connected with the temperature data output interface, the temperature value of the temperature data output interface is set as T, the temperature threshold value of the temperature protection logic operation module is set as T1, T2 and T3, and when T is larger than or equal to T1, the first output end of the temperature protection logic operation module outputs a control signal;
when T1 is more than T and is more than or equal to T2, a second output end of the temperature protection logic operation module outputs a control signal;
when T2 is more than T and is more than or equal to T3, a third output end of the temperature protection logic operation module outputs a control signal;
and the control end of the temperature protection logical operation module is connected with the temperature quality judgment interface and is used for adjusting the working state of the temperature protection logical operation module.
Further, still include:
the first output end of the temperature protection logic operation module is connected with a hydraulic control loop of the water feeding pump small turbine, the second output end of the temperature protection logic operation module is connected with the high-temperature alarm, and the third output end of the temperature protection logic operation module is connected with the low-temperature alarm.
Further, still include:
the temperature sensor is connected with the temperature data input interface and used for detecting the temperature of the positioning thrust tile of the small steam turbine of the feed pump.
Further, still include:
the temperature data output interface is connected with a first input end of the display and is used for displaying the numerical value of the temperature;
the temperature quality judgment interface is connected with a second input end of the display and used for adjusting the numerical value color of the temperature.
The invention has the advantages that: 1. when the input temperature data is mutated into an unreliable value, the setting priority trigger does not adopt the original delayed automatic reset mode, but only when the temperature data is restored to a value close to the value before the temperature mutation, the temperature is restored to the original level, the reset output of the setting priority trigger is carried out, meanwhile, one of the conditions that whether the temperature quality is judged to be a dead point is changed from the original temperature change rate judgment to the output temperature credible judgment signal of the setting priority trigger, therefore, when the temperature data is mutated to a higher value and is kept for a certain time, the dead point is still judged, and the reliability of the temperature quality judgment is logically improved. 2. Set up second analog quantity switching module, switch different temperature data input as required, the simple operation. 3. The temperature protection logic operation module outputs corresponding operation signals according to signals transmitted by the temperature data output interface and the temperature quality judging interface, and efficiency is improved. 4. The invention is applied to the small steam turbine of the feed pump, and improves the working reliability of the small steam turbine of the feed pump. 5. The display displays the temperature value and the dead pixel condition in real time to remind the staff.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the module connection of the existing DCS system for judging the temperature quality.
Fig. 2 is a schematic block connection diagram of the logic system for improving the reliability of the temperature quality determination of the DCS system according to the present invention.
Fig. 3 is a schematic connection diagram of the temperature data input interface, the temperature data output interface, the temperature quality determination interface, the display and the temperature protection logic operation module according to the present invention.
Reference numerals: a first analog quantity switching module 11; a second analog quantity switching module 12; a first delay module 21; a second delay module 22; a third delay block 23; a fourth delay module 24; a fifth delay module 25; a first dead time module 31; a second inactivity time module 32; a third inactivity time module 33; a fourth inactivity time module 34; an arithmetic mean module 40; a linear function module 50; a first subtraction module 61; a second subtraction module 62; a third subtraction module 63; a fourth subtraction module 64;
a first division module 71; a second division module 72; a multiplication module 80; a monitor relay 90; setting a priority flip-flop 100; an OR operation module 110; an undisturbed maintenance module 120; a first comparison operation module 131; a second comparison operation module 132; a third comparing operation module 133; an absolute value module 140; a first non-operation block 151; a second not operation module 152; a first constant signal generator 161; a second constant signal generator 162; a first setting number adjusting module 171; a second position number adjustment module 172;
a temperature data input interface 181; a temperature data output interface 182; a temperature quality determination interface 183; a test data input interface 184; a temperature sensor 190; a temperature protection logic operation module 200; a hydraulic control circuit 210; a high temperature alarm 220; a low temperature alarm 230; a display 240.
Detailed Description
The embodiment of the invention provides a method for improving the reliability of temperature quality judgment of a DCS, solves the technical problem that a set priority trigger in the prior art judges a wrong temperature higher value as a reliable signal to be sent from a temperature data output interface so as to cause misoperation of protection, and achieves the technical effect of improving the reliability of temperature quality judgment.
In order to solve the above problems, the technical solution in the embodiments of the present invention has the following general idea:
the temperature data providing end transmits the temperature data to a second delay module for delay processing, then the temperature data enters an undisturbed maintaining module for judgment, if the temperature change rate exceeds the limit, a set priority trigger outputs a signal '1' to the control end of the undisturbed maintaining module, the undisturbed maintaining module maintains the original numerical value output, the absolute value is subtracted from the current numerical value through a first subtraction module, the absolute value is obtained, the absolute value enters a second comparison operation module, then non-operation is carried out, and finally the set priority trigger is reset. If the temperature change rate is not over-limit, setting a priority trigger to output a signal '0' to a control end of the undisturbed maintaining module, and enabling the undisturbed maintaining module to output the numerical value of an input end; the technical scheme of the invention not only can automatically reset and eliminate the interference of short pulse mutation, but also effectively solves the protection misoperation caused by long pulse mutation, when the temperature is recovered to be close to the value before the dead point, the logic judgment that the temperature signal is recovered to be normal is carried out, and the reset is carried out on the bit priority trigger, thereby achieving the function of cutting off the signal interference and preventing the protection misoperation.
In order to better understand the technical scheme, the technical scheme is described in detail in the following with reference to the attached drawings of the specification and specific embodiments.
Referring to fig. 1 to 3, the preferred embodiment of the logic system for improving the reliability of the temperature quality determination of the DCS system of the present invention.
The function of the macro command module and device of the DCS system in the figure is illustrated:
ASW: and the analog quantity switching module outputs data of the upper input end when the control end is 1, and outputs data of the lower input end when the control end is 0.
LG: and the first-order delay module delays the data for T seconds and outputs the delayed data.
PD: and an invalid time module, wherein K is a reference value of the counter, and N is the delay times.
AVE: and the arithmetic average module is used for averaging the data at the input end and outputting the averaged data.
LIN: and a linear function module, wherein K is the slope and B is the offset.
SUB: and the subtraction module subtracts the value of the lower input end from the value of the upper input end and outputs the subtracted value.
DIV: and the division module is used for removing the numerical value of the upper input end from the numerical value of the lower input end and outputting the numerical value.
G: and the multiplication module is used for multiplying the value of the input end by K and outputting the multiplied value.
MR: the monitoring relay subtracts the value of the lower input end from the value of the upper input end, and sends a signal '1' when the result is larger than an HL value or smaller than an LL value; otherwise, a signal "0" is sent.
FFS: the priority flip-flop is set, as long as the S input end is '1', the output is '1', when the S input end is '0', the R input end is '1', the output is '0', and when the S input end and the R input end are '0', the original numerical value is kept.
OR: and the input ends of the OR operation module are only one 1, and the output ends of the OR operation module are all 1.
BHL: and the undisturbed maintaining module keeps outputting the last numerical value when the control end is changed from 0 to 1, and switches the maintained numerical value to the numerical value of the input end at the change rate R and outputs the numerical value when the control end is changed from 1 to 0.
WCM: and the comparison operation module outputs a signal '1' when the input signal is greater than the HL value or less than the LL value, and otherwise outputs a signal '0'.
ABS: and the absolute value module is used for outputting the absolute value of the numerical value of the input end.
And (3) CMP: and when HL = LL, the comparison operation module outputs '1' when the value of the input end is greater than HL, and outputs '0' when the value of the input end is less than HL.
NOT: the non-operation module outputs "0" when the input is "1" and outputs "1" when the input is "0".
TP: and the delay module delays the data for T seconds and outputs the delayed data.
SG: and a constant signal generator for outputting a fixed value K.
The invention comprises the following steps: the temperature data providing terminal, i.e. the output terminal of the first division module 71, is connected to the upper input terminal of the monitoring relay 90, the input terminal of the first delay module 21, the input terminal of the first comparing operation module 131 (WCM), the input terminal of the second delay module 22, and the lower input terminal of the first subtraction module 61. The HL value of the monitoring relay 90 is set to 4.0, the LL value is set to-4.0; the delay time T of the first delay module 21 is set to 1 second; the HL value of the first comparison operation module 131 is set to 105, the LL value is set to 0.5; the delay time T of the second delay module 22 is set to 1 second. The output end of the first delay module 21 is connected with the lower input end of the monitoring relay 90, and the output end of the monitoring relay 90 is connected with the S input end of the setting priority trigger 100; the output end of the first comparing and operating module 131 is connected to one input end of the or operating module 110, the output end of the second delay module 22 is connected to the input end of the undisturbed maintaining module 120, the output end of the undisturbed maintaining module 120 is connected to the upper input end of the first subtracting module 61, and the change rate R of the undisturbed maintaining module 120 is set to 1.0. The output end of the first subtraction module 61 is connected to the input end of the absolute value module 140, the output end of the absolute value module 140 is connected to the input end of the second comparison operation module 132 (CMP), the output end of the second comparison operation module 132 is connected to the input end of the first non-operation module 151, and both the HL value and the LL value of the second comparison operation module 132 are 10.0. The output end of the first non-operation module 151 is connected to the R input end of the set priority flip-flop 100, the output end of the set priority flip-flop 100 is connected to the other input end of the or operation module 110 and the control end of the undisturbed holding module 120, or the output end of the operation module 110 is connected to the temperature quality determination interface 183. If the or operation module 110 outputs "1" to the temperature quality determination interface 183, it indicates that the temperature quality is a dead spot, and if the or operation module 110 outputs "0" to the temperature quality determination interface 183, it indicates that the temperature quality is not a dead spot.
The temperature data input interface 181 is connected to the input end of the third delay module 23 through the second analog quantity switching module 12, and the delay time T of the third delay module 23 is set to 1.5 seconds; specifically, the output end of the second analog quantity switching module 12 is connected to the input end of the third delay module 23, the lower input end of the second analog quantity switching module 12 is connected to the temperature data input interface 181, the upper input end of the second analog quantity switching module 12 is connected to the test data input interface 184, the control end of the second analog quantity switching module 12 is connected to the first setting number adjusting module 171, in this embodiment, the first setting number adjusting module 171 is set to be a constant output signal "1", so that the temperature data of the temperature data input interface 181 is directly transmitted to the third delay module 23; if the first setting number adjusting module 171 is set to output signal "0", the data of the test data input interface 184 is transmitted to the third delay module 23; and a second analog quantity switching module 12 is arranged, and different temperature data inputs are switched according to needs, so that the operation is convenient and fast.
The output end of the third delay module 23 is connected to the upper input end of the first division module 71 through the fourth subtraction module 64, the output end of the third delay module 23 is further connected to the input ends of the four invalid time modules, the output ends of the four invalid time modules are connected to the four input ends of the arithmetic averaging module 40 in a one-to-one correspondence manner, wherein N of the first invalid time module 3 is set to 1,K and is set to 50; the second dead time module 32 has N set to 2,K set to 50; the third dead time module 33 has N set to 3,K set to 50; the fourth dead time module 34 has N set to 4,K set to 50. The output end of the arithmetic mean module 40 is connected with the input end of the linear function module 50, the output end of the linear function module 50 is connected with the lower input end of the first analog quantity switching module 11, and K of the linear function module is set to be 1,B and is set to be 0; and the linear function module operates according to y = Kx + B, wherein y is an output end numerical value and x is an input end numerical value. The output end of the first analog switching module 11 is connected to the upper input end of the first analog switching module 11 and the temperature data output interface 182, and the output end of the set priority flip-flop 100 is further connected to the control end of the first analog switching module 11.
The first constant signal generator 161 is connected to the input end of the multiplication module 80 through the third subtraction module 63, the output end of the multiplication module 80 is connected to the lower input end of the first division module 71, and the multiplicand K of the multiplication module 80 is set to 0.01. The second constant signal generator 162 is connected to a lower input end of the third subtraction module 63 and a lower input end of the fourth subtraction module 64, an output end of the first delay module 21 is further connected to an upper input end of the fourth subtraction module 64, an output end of the fourth subtraction module 64 is connected to an upper input end of the first division module 71, the first constant signal generator 161 is connected to an upper input end of the third subtraction module 63, and an output end of the fourth subtraction module 64 is connected to an input end of the multiplication module 80. The fixed value K output from the first constant signal generator 161 is set to 200, and the fixed value K output from the second constant signal generator 162 is set to 0.
The output end of the third delay module 23 is further connected to the lower input end of the second subtraction module 62, the output end of the arithmetic mean module 40 is further connected to the input end of the fourth delay module 24, the output end of the fourth delay module 24 is connected to the upper input end of the second subtraction module 62, and the delay time T of the fourth delay module 24 is set to 5 seconds. The output end of the second subtraction module 62 is connected to the upper input end of the second division module 72, the output end of the multiplication module 80 is further connected to the lower input end of the second division module 72, the output end of the second division module 72 is connected to the input end of a third comparison operation module 133 (WCM), the output end of the third comparison operation module 133 is connected to the input end of the second non-operation module 152, the HL value of the third comparison operation module 133 is set to 0.2, and the ll value is set to-0.2. The output of the second non-operation module 152 is connected to the control terminals of the four dead time modules.
The control end of the invalid time module is also called a selector switch, and the invalid time module is used for sampling data; when the second non-operation module outputs a signal '1' to the control end of the invalid time module, taking data of the input end once in the invalid time module in K sampling periods, averaging the data sampled for N times continuously and then outputting the data; when the second non-operation module outputs a signal '0' to the control end of the invalid time module, the invalid time module directly outputs the data of the input end.
The second setting number adjusting module 172 is connected to the control end of the first delay module 21, the control end of the third delay module 23, and the control end of the fourth delay module 24. The second setting number adjusting module 172 sets a constant output signal "1" to make the delay module in a working state.
The input end of the temperature protection logic operation module 200 is connected with the temperature data output interface 182, the temperature value of the temperature data output interface 182 is set as T, the temperature threshold value of the temperature protection logic operation module 200 is set as T1, T2 and T3, and when T is greater than or equal to T1, the first output end of the temperature protection logic operation module 200 outputs a control signal; when T1 is more than T and is more than or equal to T2, the second output end of the temperature protection logic operation module 200 outputs a control signal; when T2 is more than T and is more than or equal to T3, a third output end of the temperature protection logic operation module 200 outputs a control signal; the control signals here are all signals "1". In the embodiment, T1 is set to 110 ℃, and T2 is set to 90 ℃; t3 was set to 60 ℃. The control end of the temperature protection logical operation module 200 is connected to the temperature quality determination interface 183, and is configured to adjust the working state of the temperature protection logical operation module 200. When the temperature quality judging interface outputs a signal '1', three output ends of the temperature protection logic operation module 200 simultaneously output signals fixed as '0', thereby freezing the three output ends; when the temperature quality determination interface outputs a signal "0", the temperature protection logic operation module 200 controls the corresponding output terminal to output a control signal after internal calculation according to the data transmitted from the temperature data output interface 182, thereby improving the efficiency. The temperature protection logic operation module 200 is a functional module in the existing DCS system.
The first output end of the temperature protection logic operation module 200 is connected with a hydraulic control loop 210 of the feedwater pump small steam turbine, and the hydraulic control loop 210 is located between a main steam valve and an adjusting steam valve of the feedwater pump small steam turbine. When T is larger than or equal to T1, the first output end of the temperature protection logic operation module 200 outputs a control signal to stop the hydraulic control loop 210, so that the small steam turbine of the water supply pump is stopped. The second output end of the temperature protection logic operation module 200 is connected with the high temperature alarm 220, and when T1 is greater than T and is not less than T2, the second output end of the temperature protection logic operation module 200 outputs a control signal to enable the high temperature alarm 220 to work. A third output terminal of the temperature protection logic operation module 200 is connected to the low temperature alarm 230. When T2 is greater than T and is not less than T3, the third output end of the temperature protection logic operation module 200 outputs a control signal to enable the low temperature alarm 230 to work to remind a worker. When T3 is more than T, the starting condition of the small steam engine of the feed water pump is allowed. The feed pump turbine is also called a feed pump turbine.
The temperature sensor 190 is connected with the temperature data input interface 181, and the temperature sensor 190 is used for detecting the temperature of a positioning thrust shoe of the small turbine of the feed water pump. The temperature sensor 190 transmits the temperature of the positioning thrust pad of the small steam turbine of the feed water pump to the temperature data input interface 181. The invention is applied to the small steam turbine of the feed pump, and improves the working reliability of the small steam turbine of the feed pump.
The temperature data output interface 182 is connected to a first input end of the display 240, and is configured to display a temperature value; the temperature value can be conveniently observed by the working personnel in real time. The temperature quality determination interface 183 is connected to a second input terminal of the display 240, and is configured to adjust a numerical color of the temperature. For example, when the temperature quality determination interface 183 outputs a signal "1", it indicates that the temperature quality is a dead point, and the color of the temperature value is changed to red; when the temperature quality determination interface 183 outputs a signal "0", it is indicated that the temperature quality is not bad, and the color of the temperature value is changed to green.
When the temperature quality is in a bad point, a worker closes the temperature protection logic operation module, performs preliminary inspection on a positioning thrust shoe of the water supply pump car, and if the temperature quality can be recovered, the water supply pump car continues to operate and restarts the temperature protection logic operation module; if the positioning thrust pad is damaged, the small steam turbine of the water feeding pump is shut down, and the positioning thrust pad is overhauled by a worker. If the temperature sensor is damaged, the worker can discuss through professional discussions, or shut down the small steam engine of the water supply pump, check and replace the temperature sensor, or take necessary measures, cut off the temperature of the dead point, and keep running continuously.
The working principle of the logic system for improving the temperature quality judgment reliability of the DCS is as follows:
(1) The temperature sensor detects the temperature of a positioning thrust pad of the small steam turbine of the water-feeding pump and transmits temperature data to a temperature data input interface, because the output signal of the first setting adjusting module is always '1', the second analog quantity switching module constantly transmits the temperature data of the temperature data input interface to the third delay module, after 1.5 seconds of delay processing of the third delay module, one path of the temperature data passes through four invalid time modules and then enters the arithmetic mean module to obtain an average value, the average value enters the linear function module, the linear function module directly outputs the average value without changing, the average value is transmitted to the lower input end of the first analog quantity switching module, when the setting priority trigger outputs '1', the data of the upper input end is output by the first analog quantity switching module, namely, the output data is kept unchanged, the input signal is equal to the output signal, the output signal is returned to the input end, the input signal is directly output by the first analog quantity switching module, the output signal is returned to the input end, and the original signal is kept and is not changed in a circulating manner; when the set priority trigger outputs '0', the data of the lower input end output by the analog quantity switching module is changed in real time. Setting a priority trigger to output a dependable judgment of temperature.
(2) Subtracting the value of a second constant number generator from the temperature value subjected to 1.5-second delay processing of the third delay module in the fourth subtraction module, and enabling the result value to enter the upper input end of the first division module, wherein the value of the second constant number generator is 0; the value of the first constant generator subtracts the value of the third constant generator from the value of the third subtraction module, the value of the first constant generator is 200, the result value enters the multiplication module and is multiplied by the set multiplicand 0.01, and the result value 2 of the multiplication enters the lower input end of the first division module; the numerical value of the upper input end of the first division module is divided by the numerical value of the lower input end of the first division module, the obtained result is transmitted to the upper input end of the monitoring relay, the first delay module, the first comparison operation module, the second delay module and the first subtraction module, the first delay module carries out delay processing for 1 second and then transmits the processed result to the lower input end of the monitoring relay, the numerical value before the 1 second and the numerical value after the 1 second are judged in the monitoring relay, namely the judgment of the temperature change rate, for example, the temperature of each second rises to exceed 5 ℃ (the temperature drops without limitation), and the temperature change of the positioning thrust tile of the small steam turbine of the water-feeding pump is considered to be abnormal; if there is no abnormality, the monitoring relay outputs a signal "0"; if the abnormal condition exists, the monitoring relay outputs a signal '1' to the S input end of the setting priority trigger, and the setting priority trigger outputs the signal '1' to the first analog quantity switching module, so that the output of the first analog quantity switching module keeps the last numerical value; the abnormal temperature data is prevented from being transmitted to the temperature data output interface. The second delay module delays for 1 second and then transmits the signal to the undisturbed retaining module, when the set priority trigger outputs a signal '1' to the control end of the undisturbed retaining module, the undisturbed retaining module retains and outputs a last numerical value, and when the set priority trigger outputs a signal '0' to the control end of the undisturbed retaining module, the undisturbed retaining module transmits the numerical value received by the input end of the undisturbed retaining module to the first subtraction module; the absolute value module obtains an absolute value through calculation of the first subtraction module, the second comparison module receives the absolute value, outputs the absolute value after comparison and calculation, and then obtains the inverse value through the first non-operation module and transmits the inverse value to the R input end of the setting priority trigger.
When the setting priority trigger outputs a signal '1' to the control end of the undisturbed maintaining module, the undisturbed maintaining module keeps outputting a last numerical value, normal data before the temperature untrustworthy signal is sent is maintained at the moment, the data and real-time data output by the first division module are subtracted through the first subtraction module, an absolute value is obtained through the absolute value module, comparison is carried out through the second comparison operation module, when the real-time data are close to the maintained data, the second comparison operation module outputs a signal '0', negation is obtained through the first non-operation module, the signal '0' is transmitted to the R input end of the setting priority trigger to be triggered and reset, and the signal '0' is output by the setting priority trigger after reset, so that automatic reset of temperature dependable judgment is realized.
When the setting priority trigger outputs a signal '0' to the control end of the undisturbed maintaining module, the undisturbed maintaining module does not keep outputting the last numerical value at the moment, but tracks a real-time value, namely outputs the numerical value transmitted by delaying 1s from the second delaying module in real time; in the first subtraction module, if the deviation between the value of the delay 1s and the current value is small, the second comparison operation module outputs a signal '0', and finally the signal is output as '1' through the first non-operation module, and the setting priority trigger is reset until the judgment of the next temperature change rate exceeds the limit; if the judgment of the temperature change rate is out of limit, the monitoring relay outputs a signal '1' to the S input end of the setting priority trigger, and the setting priority trigger outputs the signal '1'.
The undisturbed maintaining module can record normal data before the temperature untrustworthy signal is sent, a reference basis is provided for the state when the temperature returns to normal, only when the real-time data after passing through the first division module is close to the normal data before the temperature untrustworthy signal is sent, the temperature is judged to return to normal indeed, the input end of the set priority trigger R is reset by setting '1', and the data output of the first analog quantity switching module is opened.
(3) The output signal of the set priority trigger is also transmitted to an OR operation module and a control end of a non-interference holding block, temperature overrun value judgment is carried out in a first comparison operation module, for example, whether the received temperature value exceeds 105 ℃ or is lower than 0.5 ℃, and if the temperature value is not overrun, the first comparison operation module outputs a signal '0'; if the temperature exceeds the limit, the first comparison operation module outputs a signal '1', and the first comparison operation module outputs a judgment result to the OR operation module; therefore, when the temperature change rate is judged to be abnormal or the temperature overrun value is judged to be abnormal, or the operation module outputs '1' to the temperature quality judgment interface, and the temperature quality is a dead pixel; and if the OR operation module outputs '0' to the temperature quality judgment interface, the temperature quality is not a dead point.
(4) The temperature value after 1.5 seconds of delay processing of the third delay module is also transmitted to the lower input end of the second subtraction module, the result value of the arithmetic mean module is transmitted to the fourth delay module, the temperature value enters the upper input end of the second subtraction module after being delayed for 5 seconds by the fourth delay module, the result value is transmitted to the upper input end of the second division module by the second subtraction module, the result value is transmitted to the lower input end of the second division module by the multiplication module, the result value is transmitted to the third comparison operation module by the second division module after being calculated, and the comparison result of the third comparison operation module is transmitted to the control ends of the four invalid time modules after being inverted.
(5) If the temperature quality judgment interface outputs a signal '1' to the temperature protection logical operation module, three output ends of the temperature protection logical operation module fixedly output a signal '0'; the temperature quality judging interface outputs a signal '0' to the temperature protection logic operation module, and the temperature protection logic operation module selects a corresponding output end to output a control signal after calculating according to temperature data transmitted by the temperature data output interface; the display also displays the temperature value and the color thereof according to the temperature quality judging interface and the temperature data output interface, and reminds the staff.
(6) Compared with the background technology, when the input temperature data is mutated into an unreliable value, the setting priority trigger does not adopt the original time delay automatic reset mode, but only when the temperature data is restored to a value close to the value before the temperature mutation, the temperature is restored to the original level, the reset output of the setting priority trigger is carried out, and meanwhile, one of the conditions that whether the temperature quality judgment is a bad point is changed from the original temperature change rate judgment to the output temperature credible judgment signal of the setting priority trigger, so that when the temperature data is mutated to a higher value and is kept for a certain time, the bad point is still judged, and the reliability of the temperature quality judgment is logically improved.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.
Claims (10)
1. The utility model provides an improve logic system that DCS system temperature quality judges reliability which characterized in that includes:
the temperature data providing end is connected with the upper input end of the monitoring relay, the input end of the first delay module, the input end of the first comparison operation module, the input end of the second delay module and the lower input end of the first subtraction module, the output end of the first delay module is connected with the lower input end of the monitoring relay, the output end of the monitoring relay is connected with the S input end of the setting priority trigger, the output end of the first comparison operation module is connected with one input end of the OR operation module, the output end of the second delay module is connected with the input end of the undisturbed maintaining module, the output end of the undisturbed maintaining module is connected with the upper input end of the first subtraction module, the output end of the first subtraction module is connected with the input end of the absolute value module, the output end of the absolute value module is connected with the input end of the second comparison operation module, the output end of the second comparison operation module is connected with the input end of the first non-operation module, the output end of the first non-operation module is connected with the R input end of the setting priority trigger, the output end of the setting priority trigger is connected with the other input end of the OR operation module, the control end of the undisturbed maintaining module, or the output end of the temperature quality judging interface;
the monitoring relay subtracts the value of the lower input end from the value of the upper input end, and sends a signal '1' if the result is larger than an HL value or smaller than an LL value, or sends a signal '0' if the result is not larger than the HL value;
the first delay module delays the data for T seconds and outputs the data;
the second delay module delays the data for T seconds and outputs the data;
the first comparison operation module outputs a signal '1' when the input signal is greater than an HL value or less than an LL value, otherwise outputs a signal '0';
when HL = LL, the value of the input end is greater than HL, the output is '1', the value of the input end is less than HL, and the output is '0';
the first subtraction module subtracts the value of the upper input end from the value of the lower input end and outputs the subtracted value;
setting a priority trigger, wherein the output is 1 as long as the S input end is 1, when the S input end is 0, the R input end is 1, the output is 0, and when the S input end and the R input end are 0, the original numerical value is kept;
the OR operation module has the input ends of 1 and the output of 1;
the undisturbed maintaining module keeps outputting the last numerical value when the control end is changed from 0 to 1, and switches the maintained numerical value to the numerical value of the input end at a change rate R and outputs the numerical value when the control end is changed from 1 to 0;
the absolute value module is used for taking an absolute value of the numerical value of the input end and outputting the absolute value;
a first non-operation module, wherein when the input is '1', the output is '0', and when the input is '0', the output is '1';
if the OR operation module outputs '1' to the temperature quality judgment interface, the temperature quality is a dead pixel, and if the OR operation module outputs '0' to the temperature quality judgment interface, the temperature quality is not a dead pixel.
2. The logic system of claim 1, further comprising:
the temperature data input interface is connected with the input end of a third delay module, the output end of the third delay module is connected with the upper input end of a first division module and the input ends of a plurality of invalid time modules, the output ends of the invalid time modules are connected with the input ends of an arithmetic averaging module in a one-to-one correspondence manner, the output end of the arithmetic averaging module is connected with the input end of a linear function module, the output end of the linear function module is connected with the lower input end of a first analog quantity switching module, the output end of the first analog quantity switching module is connected with the upper input end of the first analog quantity switching module and a temperature data output interface, the output end of the setting priority trigger is further connected with the control end of the first analog quantity switching module, a first constant signal generator is connected with the input end of a multiplication module, the output end of the multiplication module is connected with the lower input end of the first division module, and the output end of the first division module is the temperature data supply end;
the third delay module delays the data for T seconds and outputs the data;
the first division module is used for removing the numerical value of the upper input end from the numerical value of the lower input end and outputting the numerical value;
the invalid time module is used for taking data of one-time input end in K sampling periods, averaging the data sampled for N times continuously and outputting the data, wherein K is a reference value of the counter, N is the delay times;
the arithmetic average module is used for averaging the data at the input end and outputting the data;
a linear function module, wherein K is a slope, B is an offset, the linear function module performs operation according to y = Kx + B, y is an output end numerical value, and x is an input end numerical value;
the first analog quantity switching module outputs data of an upper input end when the control end is 1, and outputs data of a lower input end when the control end is 0;
a first constant signal generator outputting a fixed value;
and the multiplication module multiplies the numerical value of the input end by the multiplicand and then outputs the numerical value.
3. The logic system of claim 2, further comprising:
the output end of the third delay module is also connected with the lower input end of the second subtraction module, the output end of the arithmetic mean module is also connected with the input end of the fourth delay module, the output end of the fourth delay module is connected with the upper input end of the second subtraction module, the output end of the second subtraction module is connected with the upper input end of the second division module, the output end of the multiplication module is also connected with the lower input end of the second division module, the output end of the second division module is connected with the input end of the third comparison operation module, the output end of the third comparison operation module is connected with the input end of the second non-operation module, and the output end of the second non-operation module is connected with the control ends of the plurality of invalid time modules;
the second subtraction module subtracts the value of the lower input end from the value of the upper input end and outputs the subtracted value;
the fourth delay module delays the data for T seconds and outputs the data;
the second division module is used for removing the numerical value of the upper input end from the numerical value of the lower input end and outputting the numerical value;
a third comparison operation module, which outputs a signal '1' when the input signal is greater than the HL value or less than the LL value, otherwise outputs a signal '0';
a second non-operation module, wherein when the input is '1', the output is '0', and when the input is '0', the output is '1';
when a second non-operation module outputs a signal '1' to a control end of the invalid time module, taking data of an input end once in K sampling periods in the invalid time module, averaging the data sampled for N times continuously and then outputting the data; when the second non-operation module outputs a signal '0' to the control end of the invalid time module, the invalid time module directly outputs the data of the input end.
4. The logic system of claim 2, further comprising:
the output end of the second analog quantity switching module is connected with the input end of the third delay module, the lower input end of the second analog quantity switching module is connected with the temperature data input interface, the upper input end of the second analog quantity switching module is connected with the test data input interface, and the control end of the second analog quantity switching module is connected with the first setting number adjusting module;
the second analog quantity switching module outputs data of an upper input end when the control end is 1, and outputs data of a lower input end when the control end is 0;
the first number setting adjusting module outputs a signal '1' or '0'.
5. The logic system of claim 3, further comprising:
the second number setting adjusting module is connected with the control end of the first delay module, the control end of the third delay module and the control end of the fourth delay module;
and the second setting number adjusting module outputs a signal '1'.
6. The logic system of claim 2, further comprising:
the second constant signal generator is connected with the lower input end of the third subtraction module and the lower input end of the fourth subtraction module, the output end of the third delay module is also connected with the upper input end of the fourth subtraction module, the output end of the fourth subtraction module is connected with the upper input end of the first division module, the first constant signal generator is connected with the upper input end of the third subtraction module, and the output end of the fourth subtraction module is connected with the input end of the multiplication module;
a second constant signal generator outputting a fixed value;
the third subtraction module subtracts the value of the lower input end from the value of the upper input end and outputs the subtracted value;
and the fourth subtraction module subtracts the value of the lower input end from the value of the upper input end and outputs the result.
7. The logic system of claim 2, further comprising:
the input end of the temperature protection logic operation module is connected with the temperature data output interface, the temperature value of the temperature data output interface is set as T, the temperature threshold value of the temperature protection logic operation module is set as T1, T2 and T3, and when T is larger than or equal to T1, the first output end of the temperature protection logic operation module outputs a control signal;
when T1 is more than T and is more than or equal to T2, a second output end of the temperature protection logic operation module outputs a control signal;
when T2 is more than T and is more than or equal to T3, a third output end of the temperature protection logic operation module outputs a control signal;
the control end of the temperature protection logical operation module is connected with the temperature quality judgment interface and is used for adjusting the working state of the temperature protection logical operation module;
when the temperature quality judging interface outputs a signal '1', three output ends of the temperature protection logic operation module simultaneously output signals fixed as '0', and when the temperature quality judging interface outputs a signal '0', the temperature protection logic operation module controls the corresponding output ends to output control signals according to data transmitted from the temperature data output interface.
8. The logic system of claim 7, further comprising:
the first output end of the temperature protection logic operation module is connected with a hydraulic control loop of the water feeding pump small turbine, the second output end of the temperature protection logic operation module is connected with the high-temperature alarm, and the third output end of the temperature protection logic operation module is connected with the low-temperature alarm.
9. The logic system of claim 8, further comprising:
the temperature sensor is connected with the temperature data input interface and used for detecting the temperature of the positioning thrust tile of the small steam turbine of the feed pump.
10. The logic system of claim 2, further comprising:
the temperature data output interface is connected with a first input end of the display and is used for displaying a temperature value;
the temperature quality judgment interface is connected with a second input end of the display and used for adjusting the numerical value color of the temperature.
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| CN101465538A (en) * | 2007-12-19 | 2009-06-24 | 贵阳铝镁设计研究院 | Temperature protection method for DCS system |
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| CN108153144A (en) * | 2017-11-29 | 2018-06-12 | 中核控制系统工程有限公司 | A kind of DCS redundant manipulators no-harass switch method |
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