CN108345295B - Analog quantity multi-measuring-point logic algorithm - Google Patents
Analog quantity multi-measuring-point logic algorithm Download PDFInfo
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- CN108345295B CN108345295B CN201810244040.9A CN201810244040A CN108345295B CN 108345295 B CN108345295 B CN 108345295B CN 201810244040 A CN201810244040 A CN 201810244040A CN 108345295 B CN108345295 B CN 108345295B
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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
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0256—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults injecting test signals and analyzing monitored process response, e.g. injecting the test signal while interrupting the normal operation of the monitored system; superimposing the test signal onto a control signal during normal operation of the monitored system
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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
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
Abstract
The invention discloses an analog quantity multi-measuring point logic algorithm, which comprises the following steps: step 100, setting four measuring points on a system to be measured; 200, taking one of the measuring points as a replacement measuring point, accessing the other three measuring points into an analog quantity three-selection value module through an algorithm block, outputting a measuring point signal value output through an analog quantity three-selection algorithm, outputting a system adjusting instruction through a PID algorithm, simultaneously replacing the measuring point with an open circuit in time through a switching block system, judging the quality of a measuring signal through a judging module, and setting a difference value by using a setting module for comparison, so that the signal test in an automatic control system is facilitated, most problems encountered in the operation of a daily unit are solved, the working environment and the working intensity of maintainers and operators are greatly improved, and the device can be applied to different automatic adjusting systems.
Description
Technical Field
The invention relates to the technical field of automatic control systems, in particular to an analog quantity multi-measuring point logic algorithm.
Background
In an automatic control system of a thermal power plant, three sets of measuring devices are generally configured and installed at pressure, temperature, flow rate, liquid level and other measuring points of some important equipment or process flow systems.
When the daily boiler furnace pressure automatic regulating system operates, the frequency and the amplitude of the change of the magnitude of the three measuring points are large, and when one measuring point is in fault, an operator can 'raise his mind and hang his bladder', and when an maintainer carries out defect treatment or regular inspection on a certain measuring point, the operator can also take care of 'walking thin ice', and the operator is afraid of the occurrence of errors.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an analog quantity multi-measuring point logic algorithm, which solves most problems encountered in the operation of a daily unit, greatly improves the working environment and the working intensity of maintainers and operators, can be applied to different working systems, and can effectively solve the problems provided by the background art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an analog quantity multi-point logic algorithm comprises the following steps:
step 100, setting four measuring points on a system to be measured;
and 200, taking one of the measuring points as a replacement measuring point, accessing the other three measuring points into an analog quantity three-selection value module through an algorithm block, outputting a measuring point signal value through an analog quantity three-selection algorithm, and outputting a system adjusting instruction through a PID algorithm.
Preferably, the four measuring points are respectively a measuring point I, a measuring point II, a measuring point III and a measuring point IV serving as a substitute measuring point;
when the signal values of the first measuring point, the second measuring point, the third measuring point and the fourth measuring point are judged by the quality judgment block and reach the preset qualified requirement, the analog quantity three selected value module outputs a middle value of the three measuring points to a downstream PID algorithm block;
when an electric signal open circuit condition occurs at any one of the measuring points I, II and III, the measuring point IV replaces the measuring point through the switching block, and the middle value after replacing the measuring point is output to the downstream PID algorithm block through the value module selected by the analog quantity III.
Preferably, the method further comprises the following steps: when an electric signal open circuit condition occurs at any one of the first measuring point, the second measuring point and the third measuring point, the output point of the quality judgment block of the measuring point is turned from '1' to '0', and the output points of the quality judgment blocks of other measuring points are all '1'.
Preferably, the method further comprises the following steps: the measuring point with the electric signal open circuit condition and other measuring points without the electric signal open circuit condition act together to send a 1-second pulse signal to the RS trigger, so that the switching block receives the signal of the alternate measuring point, namely the input end of the analog quantity three-selected-value module receives the signal of the alternate measuring point.
Preferably, the analog quantity three-selection algorithm includes:
firstly, performing quality judgment on input three measuring point signals through a quality judgment block;
when the quality of the input three measuring point signals meets the preset requirement, deviation value judgment is carried out, if the deviation value between every two measuring point signals is within an allowable range, the analog quantity three-selected-value module selects a middle value from the three measuring point signals to be output and transmits the middle value to a downstream PID algorithm block;
when the quality of one measuring point signal in the three measuring point signals does not meet the preset requirement and the quality of the other two measuring point signals meets the requirement, the measuring point signals which do not meet the requirement are automatically removed by the value module in the analog quantity three-selection, and the deviation value of the remaining two measuring point signals is judged;
if the deviation value between the remaining two measuring point signals is within the allowable range, the analog quantity three-selected-value module outputs the average value of the two measuring point signals as algorithm output;
if the deviation value between the remaining two measuring point signals exceeds the allowable range, the analog quantity three-selected-value module outputs the larger value of the two measuring point signals as algorithm output;
when two or three measuring point signals in the three measuring point signals do not meet the preset requirements, the system gives an alarm and prompts serious faults of the system.
Preferably, the quality determination method of the quality determination block includes:
firstly, setting a measurement reference of the whole quality judgment block;
then detecting whether external factors exist in the measuring point signals or not, and judging the quality of the measuring point signals after the external factor interference is eliminated;
and comparing the input measuring point signals with the measuring reference, and judging whether all the measuring point signals accord with the measuring reference.
Preferably, the extrinsic factor includes a site link condition.
Preferably, the PID algorithm block obtains an intermediate value output by the analog quantity three-selected-value module, and the intermediate value is used as the measured value PV.
Preferably, the number of the replacement measuring points can also be 2 or more than 2.
Compared with the prior art, the invention has the beneficial effects that:
through the logic algorithm of the invention, when a certain measuring point in an automatic regulating system is maintained, the measuring point can exit the automatic regulating system only by opening a circuit instantly or forcibly breaking a point in the logic by a signal of the certain measuring point, but the regulating system does not need to exit automatically.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic diagram of an analog quantity ternary selection value module according to the present invention;
FIG. 3 is a block diagram of the PID algorithm of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 3, the present invention provides an analog quantity multi-point logic algorithm, which comprises the following steps:
step 100, setting four measuring points on a system to be measured;
and 200, taking one measuring point as a replacement measuring point, accessing the other three measuring points into an analog quantity three-selection value module through an algorithm block, outputting a measuring point signal value through an analog quantity three-selection algorithm, and outputting a system adjusting instruction through a PID algorithm.
When a certain measuring point of the automatic regulating system is in a state and cannot be continuously and safely used, the measuring point in the state can be replaced by a substitute measuring point to ensure that the module for selecting the value of the analog quantity three can stably obtain three input signals, and when two or more measuring points are in the state, the system fault is directly judged and needs to be overhauled.
As a preferable mode of the present embodiment, 2 or more alternative measurement points may be provided to replace a plurality of measurement points when the plurality of measurement points are in a state.
In this embodiment, the four measuring points can be recorded as measuring point one, measuring point two, measuring point three and measuring point four as a replacement measuring point;
when the signal values of the first measuring point, the second measuring point, the third measuring point and the fourth measuring point are judged by the quality judgment block and reach the preset qualified requirement, the analog quantity three selected value module outputs a middle value of the three measuring points to a downstream PID algorithm block;
when an electric signal open circuit condition occurs at any measuring point of the measuring point I, the measuring point II and the measuring point III at a certain moment, the measuring point IV replaces the measuring point through the switching block, and the middle value after replacing the measuring point is output to the downstream PID algorithm block through the value module selected by the analog quantity III.
In the embodiment, when an electrical signal open circuit condition occurs at any one of the first measuring point, the second measuring point and the third measuring point, the output point of the quality determination block of the measuring point is inverted from "1" to "0" (namely, a "not" logic signal), the output points of the quality determination blocks of the other measuring points are all "1", at this time, the measuring point of the "0" signal and the other measuring points which show the "1" signal act together to send a 1 second pulse signal to the RS trigger, so that the switching block receives the signal of the alternate measuring point, that is, the input end of the analog quantity three-selected value module receives the signal of the alternate measuring point, thus the analog quantity three-selected algorithm median module always (strictly speaking, almost neglected switching time) selects a middle value from the signals of the three measuring points as the output of the algorithm block, and the control system works in the best state.
The analog quantity three-selection algorithm in the embodiment specifically comprises the following steps:
firstly, performing quality judgment on three input measuring point signals through a quality judgment block;
step two, when the quality of the input three measuring point signals meets the preset requirement, deviation value judgment is carried out, if the deviation values between every two measuring point signals are within an allowed range (only if the three deviation values are within the allowed range, the three measuring point signals are considered to be normal), an intermediate value is selected from the three measuring point signals by the analog quantity three-selected-value module to be output, and the intermediate value is transmitted to a downstream PID algorithm block; the PID algorithm block obtains a middle value output by the analog quantity three-selected-value module and takes the middle value as a measured value PV;
step three, when the quality of one measuring point signal in the three measuring point signals does not meet the preset requirement and the quality of the other two measuring point signals meets the requirement, the analog quantity three-selected value module automatically eliminates the measuring point signals which do not meet the requirement and judges the deviation value of the remaining two measuring point signals;
step four, if the deviation value between the remaining two measuring point signals is within an allowable range, the analog quantity three-selected value module outputs the average value of the two measuring point signals as algorithm output;
step five, if the deviation value between the remaining two measuring point signals exceeds the allowable range, the analog quantity three-selected value module outputs a larger value of the two measuring point signals as algorithm output;
and step six, when two or three measuring point signals in the three measuring point signals do not meet the preset requirements, the system gives an alarm and prompts serious faults of the system.
In the present embodiment, the quality determination method of the quality determination block is:
firstly, setting a measurement reference of the whole quality judgment block; then detecting whether external factors exist in the measuring point signals or not, and judging the quality of the measuring point signals after the external factor interference is eliminated; and comparing the input measuring point signals with the measuring reference, and judging whether all the measuring point signals accord with the measuring reference.
The logic algorithm is specifically described below by taking an automatic boiler furnace pressure system of a 600 megawatt thermal generator set as an example:
firstly, three sets of pressure measuring devices are arranged in a boiler furnace, the three sets of pressure measuring devices are respectively arranged at a measuring point I, a measuring point II and a measuring point III, measuring point signals obtained at the measuring point I, the measuring point II and the measuring point III are respectively X1, X2 and X3, and meanwhile, a set of pressure measuring device is additionally arranged to measure the pressure at the measuring point IV in the furnace, and the signal obtained by measurement is X4.
When X1, X2 and X3 measured at the first measuring point, the second measuring point and the third measuring point are in a normal state and an open circuit condition does not occur, the signals are output through an analog quantity three-selected value algorithm, X1, X2 and X3 measured at the first measuring point, the second measuring point and the third measuring point are respectively output to an A port, a B port and a C port of the analog quantity three-selected value algorithm, and algorithm judgment is carried out through the analog quantity three-selected value algorithm.
When an open circuit occurs in the first measuring point, the second measuring point and the third measuring point due to external factors, taking the first measuring point as an example, if the X1 of the first measuring point is open circuit, the output point X1 of the first measuring point in the logic is turned from "1" to "0", and the output points of the quality determination blocks of the other three measuring points X2, X3 and X4 are all "1", so that the negation of "0" of X1 is combined with "1" of X2, X3 and X4, and then a 1-second pulse signal is sent out to set an RS trigger (Q is 1), so that the output of the switching block system receives a signal of the fourth measuring point, the first measuring point is replaced by the fourth measuring point, that X4 is input to an a port, that is, the "a" input of the analog quantity three-selection algorithm block receives a signal of the fourth measuring point, and the analog quantity three-selection algorithm block performs operation processing on X4, X2 and X3.
When an open circuit occurs at the measuring point two or the measuring point three, the whole process starts to use the X4 at the measuring point four as a substitute measuring point for the three measuring points, namely the measuring point one, the measuring point two and the measuring point three, so that the whole measuring process can be stably carried out.
After the port A, the port B and the port C of the analog quantity three-selected value algorithm block respectively receive signals, the judgment and the output are carried out through the analog quantity three-selected value algorithm block.
When the signals of the port A, the port B and the port C meet the requirements and the difference value between the port A, the port B and the port C is within the set range of the setting module, the analog quantity three-selected-value algorithm block outputs the median value of the signals of the port A, the port B and the port C as output;
when one of the signals of the port A, the port B and the port C does not meet the quality requirement, and the other two signals meet the quality requirement (taking the signal of the port A as an example), the analog quantity three-selected-value algorithm block automatically eliminates the signal of the port A, and then difference comparison is carried out on the remaining signals of the port B and the port C;
if the difference value of the signals of the port B and the port C is within the set range of the setting module, the average value of the signals of the port B and the port C is output as output by the whole algorithm block;
and if the difference value between the port B and the port C is not set within the setting range of the module any more, outputting a larger signal value in the port B and the port C as output by the whole algorithm block.
When the signal quality of the port A, the signal quality of the port B and the signal quality of the port C do not meet the requirements, the analog quantity three-selected-value algorithm block outputs another measuring point signal meeting the requirements, and simultaneously alarms to prompt the system to have serious faults.
The signal output by the analog quantity three-selected value algorithm block is used as input PV of the PID algorithm block, meanwhile, the input PV is compared with the set value SP of the PID algorithm block, and the PID algorithm block outputs an instruction to adjust the output of the induced draft fan after operation, so that the air output and the air input of the boiler reach a stable state balance, and the boiler furnace works in a micro-positive pressure or micro-negative pressure state to protect the furnace from being damaged.
The optimization algorithm can be applied to an automatic boiler furnace pressure adjusting system, and can be applied to a steam drum water level, a feed water flow, a steam flow and other important automatic adjusting systems in a boiler feed water automatic adjusting system.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. An analog quantity multi-point logic algorithm is characterized in that: the method comprises the following steps:
step 100, setting four measuring points on a system to be measured;
200, taking one of the measuring points as a replacement measuring point, accessing the other three measuring points into an analog quantity three-choice value module through an algorithm block, outputting a measuring point signal value through an analog quantity three-choice algorithm, and outputting a system adjusting instruction through a PID algorithm;
the four measuring points are respectively a measuring point I, a measuring point II, a measuring point III and a measuring point IV serving as a substitute measuring point;
when the signal values of the first measuring point, the second measuring point, the third measuring point and the fourth measuring point are judged by the quality judgment block and reach the preset qualified requirement, the value module in the third analog quantity selection outputs a middle value of the first measuring point, the second measuring point and the third measuring point to a downstream PID algorithm block;
when an electric signal open circuit condition occurs at any one of the first measuring point, the second measuring point and the third measuring point at a certain moment, the output point of the quality judging block of the measuring point is turned from '1' to '0', the output points of the quality judging blocks of the other measuring points are all '1', at the moment, the measuring point of the '0' signal and the other measuring points which show '1' signals act together to send a pulse signal of 1 second to the RS trigger, the fourth measuring point replaces the measuring point through the switching block, and the middle value after the replacement of the measuring point is output to the downstream PID algorithm block through the value module selected from the third analog quantity.
2. The analog quantity multi-point logic algorithm according to claim 1, further comprising: when an electric signal open circuit condition occurs at any one of the first measuring point, the second measuring point and the third measuring point, the output point of the quality judgment block of the measuring point is turned from '1' to '0', and the output points of the quality judgment blocks of other measuring points are all '1'.
3. The analog quantity multi-point logic algorithm according to claim 2, further comprising: the measuring point with the electric signal open circuit condition and other measuring points without the electric signal open circuit condition act together to send a 1-second pulse signal to the RS trigger, so that the switching block receives the signal of the alternate measuring point, namely the input end of the analog quantity three-selected-value module receives the signal of the alternate measuring point.
4. The analog quantity multi-point logic algorithm as claimed in claim 1, wherein the analog quantity three-selection algorithm comprises:
firstly, performing quality judgment on input three measuring point signals through a quality judgment block;
when the quality of the input three measuring point signals meets the preset requirement, deviation value judgment is carried out, if the deviation value between every two measuring point signals is within an allowable range, the analog quantity three-selected-value module selects a middle value from the three measuring point signals to be output and transmits the middle value to a downstream PID algorithm block;
when the quality of one measuring point signal in the three measuring point signals does not meet the preset requirement and the quality of the other two measuring point signals meets the requirement, the measuring point signals which do not meet the requirement are automatically removed by the value module in the analog quantity three-selection, and the deviation value of the remaining two measuring point signals is judged;
if the deviation value between the remaining two measuring point signals is within the allowable range, the analog quantity three-selected-value module outputs the average value of the two measuring point signals as algorithm output;
if the deviation value between the remaining two measuring point signals exceeds the allowable range, the analog quantity three-selected-value module outputs the larger value of the two measuring point signals as algorithm output;
when two or three measuring point signals in the three measuring point signals do not meet the preset requirements, the system gives an alarm and prompts serious faults of the system.
5. The analog quantity multi-point logic algorithm as claimed in claim 3, wherein the quality judgment method of the quality judgment block comprises:
firstly, setting a measurement reference of the whole quality judgment block;
then detecting whether external factors exist in the measuring point signals or not, and judging the quality of the measuring electric signals after the external factor interference is eliminated;
and comparing the input measuring point signals with the measuring reference, and judging whether all the measuring point signals accord with the measuring reference.
6. The analog quantity multi-point logic algorithm is characterized in that the extrinsic factors comprise point connection conditions.
7. The analog quantity multi-point logic algorithm as claimed in claim 1, wherein the PID algorithm block obtains the intermediate value output by the analog quantity three-selected value module as the actual measurement value PV.
8. The analog quantity multi-point logic algorithm is characterized in that the number of the replacement points can be 2 or more than 2.
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