CN108490919A - Scattered control system equipment dependability appraisal procedure based on on-line condition monitoring - Google Patents
Scattered control system equipment dependability appraisal procedure based on on-line condition monitoring Download PDFInfo
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- CN108490919A CN108490919A CN201810344520.2A CN201810344520A CN108490919A CN 108490919 A CN108490919 A CN 108490919A CN 201810344520 A CN201810344520 A CN 201810344520A CN 108490919 A CN108490919 A CN 108490919A
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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
- G05B23/0243—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 model based detection method, e.g. first-principles knowledge model
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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
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Testing And Monitoring For Control Systems (AREA)
Abstract
The scattered control system equipment dependability appraisal procedure based on on-line condition monitoring that the present invention relates to a kind of, this method assess each equipment in scattered control system respectively, specially：(1) equipment to be assessed is monitored on-line；(2) fault message of the equipment in monitoring period of time is obtained；(3) the equipment mean free error time interval is sought；(4) the equipment operational reliability is determined according to mean free error time interval.Compared with prior art, assessment result of the present invention is objective reliable, can real time reaction equipment state, reference value is high.
Description
Technical field
The present invention relates to a kind of scattered control system equipment dependability appraisal procedures, more particularly, to one kind based in threadiness
The scattered control system equipment dependability appraisal procedure of state monitoring.
Background technology
Currently, being mostly based on the initial reliability index of equipment to the reliability evaluation of DCS in Power Plant equipment
Value carries out, but in power plant's actual moving process, due to the variation of environment etc., can cause reliably to sexually revise, so that initially
Reliability index can not the current reliability of objective and accurate description equipment, it is therefore desirable to which a kind of implementations appraisal procedure is disperseed to determine
Control system equipment operational reliability improves structure accuracy.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind being based on presence
The scattered control system equipment dependability appraisal procedure of monitoring.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of scattered control system equipment dependability appraisal procedure based on on-line condition monitoring, this method is to decentralised control
Each equipment in system is assessed respectively, specially：
(1) equipment to be assessed is monitored on-line；
(2) fault message of the equipment in monitoring period of time is obtained；
(3) the equipment mean free error time interval is sought；
(4) the equipment operational reliability is determined according to mean free error time interval.
Step (1) is specially：The status monitoring point for choosing equipment to be assessed, obtains the state of the status monitoring point in real time
Value.
Step (2) is specially：Determine whether the equipment occurs according to the state value of the status monitoring of equipment to be assessed point
Failure, the time that recording equipment breaks down if breaking down.
Step (3) mean free error time interval obtains in the following way：
MTBF indicates the mean free error time interval of equipment to be assessed, TiIndicate i-th event of equipment to be assessed
The time of barrier, MTBF0Indicate that the initial mean free error time interval of equipment to be assessed, n indicate to be assessed in monitoring period of time
Device fails total degree.
Step (4) is specially：
Equipment operational reliability grade to be assessed is set, is corresponding between the mean free error time of setting under each grade
Every range；
The mean free error time interval of the equipment to be assessed determined according to step (3) determines the equipment operational reliability
Grade.
Equipment in scattered control system includes DPU, I/O fastener and power-supply device.
Compared with prior art, the invention has the advantages that：
(1) present invention carries out real time on-line monitoring to each equipment in decentralized system, passes through mean free error time interval
It obtains objective effective reliability index value, lays the foundation for equipment dependability evaluation.
(2) reliability assessment result of the present invention is objective reliable, can real time reaction equipment state, reference value is high.
Description of the drawings
Fig. 1 is that the present invention is based on the flow chart elements of the scattered control system equipment dependability appraisal procedure of on-line condition monitoring
Figure.
Specific implementation mode
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.Note that the following embodiments and the accompanying drawings is said
Bright is substantial illustration, and the present invention is not intended to be applicable in it object or its purposes is defined, and the present invention does not limit
In the following embodiments and the accompanying drawings.
Embodiment
As shown in Figure 1, a kind of scattered control system equipment dependability appraisal procedure based on on-line condition monitoring, this method
Each equipment in scattered control system is assessed respectively, the equipment in scattered control system include DPU, I/O fastener and
Power-supply device.
The specific steps assessed each equipment include：
(1) equipment to be assessed is monitored on-line；
(2) fault message of the equipment in monitoring period of time is obtained；
(3) the equipment mean free error time interval is sought；
(4) the equipment operational reliability is determined according to mean free error time interval.
Step (1) is specially：The status monitoring point for choosing equipment to be assessed, obtains the state of the status monitoring point in real time
Value.
Step (2) is specially：Determine whether the equipment occurs according to the state value of the status monitoring of equipment to be assessed point
Failure, the time that recording equipment breaks down if breaking down.
Step (3) mean free error time interval obtains in the following way：
MTBF indicates the mean free error time interval of equipment to be assessed, TiIndicate i-th event of equipment to be assessed
The time of barrier, MTBF0Indicate that the initial mean free error time interval of equipment to be assessed, n indicate to be assessed in monitoring period of time
Device fails total degree.
Step (4) is specially：
Equipment operational reliability grade to be assessed is set, is corresponding between the mean free error time of setting under each grade
Every range；
The mean free error time interval of the equipment to be assessed determined according to step (3) determines the equipment operational reliability
Grade.
Specifically：
Step 1, on-line monitoring obtain DPU from the status monitoring point Y (t) to put into operation so farDPU；
On-line monitoring obtains I/O fasteners from the status monitoring point Y (t) to put into operation so farI/O；
On-line monitoring obtains power supply from the status monitoring point Y (t) to put into operation so farPower supply。
Step 2, according to Y (t)DPUValue, judges DPU on-line operation states；According to Y (t)I/OValue, judges that I/O fasteners are online
Operating status；According to Y (t)Power supplyValue, judges power supply on-line operation state；If there are malfunction, DPU, fastener, power supply are recorded
Fault time TDPUi、TI/Oi、TPower supply i(i=1,2 ... n), for the occurrence of different equipment (DPU, fastener, power supply) n here
Then difference executes step 3.
Step 3: correcting its initial mean free error time interval MTBF using the fault time of DPU0DPU, solve it and work as
Preceding mean free error time interval MTBFDPU：
Its initial mean free error time interval MTBF is corrected using the fault time of I/O fasteners0I/O, it is current to solve it
Mean free error time interval MTBFI/O：
Its initial mean free error time interval MTBF is corrected using the fault data of power supply0 power supply, it is current flat to solve it
Equal failure free time interval：
Known initial MTBF values, that is, equipment MTBF factory-said values are MTBF0DPU=2837442, MTBFOI/O=2149691,
MTBF0 power supply=1538461.
DPU is obtained from the fortune status monitoring point Y (t) to put into operation so far by step 1 for DPUDPU；Then second is carried out
Step, judges whether DPU breaks down so far from putting into operation, if so, then recording the fault time T of DPUDPUi, i=1,2 ..., n, note
The results are shown in Table 1 for record, otherwise terminates this Calculation of Reliability, i.e. MTBF values are still initial value, need not be corrected；Next into
Row step 3, according to the fault time T of DPUDPUiThe current mean free error time intervals DPU are calculated, calculating terminates, and calculates
The results are shown in Table 2.
I/O fasteners are obtained from the status monitoring point Y (t) to put into operation so far by step 1 for I/O fastenersI/O；Then into
Row second step, judges whether I/O fasteners break down so far from putting into operation, and the fault time T of I/O fasteners is recorded if havingI/Oi, i
=1,2 ..., n, the results are shown in Table 1 for record, otherwise terminates this Calculation of Reliability, i.e. MTBF values are still initial value, are not required to
It corrects；Followed by step 3, according to the fault time T of I/O fastenersI/OiCalculate the current Mean of I/O fasteners
Time interval, calculating terminate, and result of calculation is as shown in table 2.
Power supply is obtained from the status monitoring point Y (t) to put into operation so far by step 1 for power supplyPower supply；Then second is carried out
Step, judges whether power supply breaks down so far from putting into operation, the fault time T of recording power if havingPower supply i, i=1,2 ..., n,
The results are shown in Table 1 for record, otherwise terminates this Calculation of Reliability, i.e. MTBF values are still initial value, need not be corrected；Next
Step 3 is carried out, according to the fault time T of power supplyPower supply i, the current mean free error time interval of power supply is calculated, calculating terminates,
Result of calculation is as shown in table 2.
The failure logging of 1 DPU of table, fastener, power supply
| Equipment | Operating status point Y | Operating status | Time |
| DPU | 0 | Failure | When 20 days 8 October in 2011 |
| Fastener | 0 | Failure | When 11 days 9 January in 2012 |
| Power supply | 0 | Failure | At 2016 2 months 10 days 18 |
| Fastener | 0 | Failure | When 20 days 10 November in 2017 |
2 DPU of table, fastener, power supply correct front and back MTBF values
| DCS equipment | Initial MTBF values | Correct MTBF values |
| DPU | 2837442 | 2837442 |
| Fastener | 2149691 | 1100466 |
| Power supply | 1538461 | 1538461 |
Step 4 assesses DCS equipment dependabilities.
MTBF values can be used as the Appreciation gist of equipment dependability, accordingly can computing device crash rate and the phases such as reliability
The reliability index of pass.
Specifically：Set equipment operational reliability grade to be assessed, as include it is excellent, good, in, low four grades, often
The mean free error time interval of setting is corresponding under a grade；Then according to the average nothing of determining equipment to be assessed
Failure time interval determines the equipment operational reliability grade.
The equipment dependability computational methods of DCS in Power Plant based on on-line monitoring, are supervised according to equipment state
Measuring point judges the operating status at equipment each moment, and records its time to malfunction, and it is flat then to establish equipment on this basis
The computation model at equal failure free time interval, the current MTBF values of equipment can be found out by substituting into the fault time of equipment, according to
MTBF values can computing device crash rate and reliability, therefore the mean free error time interval MTBF value of equipment can be used as and set
The Appreciation gist of standby reliability.
The above embodiment is only to enumerate, and does not indicate that limiting the scope of the invention.These embodiments can also be with other
Various modes are implemented, and can make in the range of not departing from technical thought of the invention it is various omit, displacement, change.
Claims (6)
1. a kind of scattered control system equipment dependability appraisal procedure based on on-line condition monitoring, which is characterized in that this method
Each equipment in scattered control system is assessed respectively, specially：
(1) equipment to be assessed is monitored on-line；
(2) fault message of the equipment in monitoring period of time is obtained；
(3) the equipment mean free error time interval is sought；
(4) the equipment operational reliability is determined according to mean free error time interval.
2. a kind of scattered control system equipment dependability assessment side based on on-line condition monitoring according to claim 1
Method, step (1) are specially：The status monitoring point for choosing equipment to be assessed, obtains the state value of the status monitoring point in real time.
3. a kind of scattered control system equipment dependability assessment side based on on-line condition monitoring according to claim 1
Method, which is characterized in that step (2) is specially：Determine that the equipment is according to the state value of the status monitoring of equipment to be assessed point
Time no to break down, that recording equipment breaks down if breaking down.
4. a kind of scattered control system equipment dependability assessment based on on-line condition monitoring according to claim 1 or 3
Method, which is characterized in that step (3) mean free error time interval obtains in the following way：
MTBF indicates the mean free error time interval of equipment to be assessed, TiIndicate the ith failure of equipment to be assessed when
Between, MTBF0Indicate that the initial mean free error time interval of equipment to be assessed, n indicate equipment to be assessed in monitoring period of time
The total degree to break down.
5. a kind of scattered control system equipment dependability assessment side based on on-line condition monitoring according to claim 1
Method, which is characterized in that step (4) is specially：
Equipment operational reliability grade to be assessed is set, the mean free error time interval model of setting is corresponding under each grade
It encloses；
The mean free error time interval of the equipment to be assessed determined according to step (3) determines the equipment operational reliability etc.
Grade.
6. a kind of scattered control system equipment dependability assessment side based on on-line condition monitoring according to claim 1
Method, which is characterized in that the equipment in scattered control system includes DPU, I/O fastener and power-supply device.
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| CN201810344520.2A CN108490919A (en) | 2018-04-17 | 2018-04-17 | Scattered control system equipment dependability appraisal procedure based on on-line condition monitoring |
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| CN201810344520.2A CN108490919A (en) | 2018-04-17 | 2018-04-17 | Scattered control system equipment dependability appraisal procedure based on on-line condition monitoring |
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Citations (4)
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|---|---|---|---|---|
| US6671654B1 (en) * | 2000-11-28 | 2003-12-30 | Power Measurement Ltd. | Apparatus and method for measuring and reporting the reliability of a power distribution system |
| CN104268678A (en) * | 2014-09-15 | 2015-01-07 | 中国石油化工股份有限公司武汉分公司 | Preventative device maintenance method based on dynamic reliability |
| CN104821789A (en) * | 2015-05-06 | 2015-08-05 | 国家电网公司 | Method for detecting reliability of photovoltaic power generation system |
| CN105512812A (en) * | 2015-12-02 | 2016-04-20 | 中广核工程有限公司 | Nuclear power plant equipment fault early warning analysis method and system based on dynamic simulation model |
-
2018
- 2018-04-17 CN CN201810344520.2A patent/CN108490919A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6671654B1 (en) * | 2000-11-28 | 2003-12-30 | Power Measurement Ltd. | Apparatus and method for measuring and reporting the reliability of a power distribution system |
| CN104268678A (en) * | 2014-09-15 | 2015-01-07 | 中国石油化工股份有限公司武汉分公司 | Preventative device maintenance method based on dynamic reliability |
| CN104821789A (en) * | 2015-05-06 | 2015-08-05 | 国家电网公司 | Method for detecting reliability of photovoltaic power generation system |
| CN105512812A (en) * | 2015-12-02 | 2016-04-20 | 中广核工程有限公司 | Nuclear power plant equipment fault early warning analysis method and system based on dynamic simulation model |
Non-Patent Citations (1)
| Title |
|---|
| 代云飞: "《DCS系统可靠性评价研究与软件开发》", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
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Application publication date: 20180904 |