CN105510754A - Dual AD sampling inconsistency judging method for intelligent substation - Google Patents
Dual AD sampling inconsistency judging method for intelligent substation Download PDFInfo
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- CN105510754A CN105510754A CN201610043849.6A CN201610043849A CN105510754A CN 105510754 A CN105510754 A CN 105510754A CN 201610043849 A CN201610043849 A CN 201610043849A CN 105510754 A CN105510754 A CN 105510754A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention relates to a dual AD sampling inconsistency judging method for an intelligent substation. The method comprises the following steps that 1, dual AD sampling values of measured electrical quantity are acquired; 2, effective values and true effective values of fundamental waves of all cyclic waves of the dual AD sampling values of the measured electrical quantity are calculated separately; 3, whether the dual AD sampling values of the measured electrical quantity are valid or not is judged; 4, if yes, whether the dual AD sampling values are consistent or not is judged, wherein the judging method comprises the steps whether an absolute value of a difference value of the dual AD sampling values of the measured electrical quantity is larger than a preset threshold value or not is judged, and if yes, it is judged that the dual AD sampling values are inconsistent. According to the method, due to the fact that the validity of the AD sampling values of all ways is compared firstly, the possibility that misjudgment is caused due to the fact that in the judging process, the AD sampling values of all the ways are invalid, but the difference value of the dual AD sampling values meets the condition after being compared with the preset threshold value is avoided, and therefore, the judging accuracy is improved.
Description
Technical field
The invention belongs to intelligent substation technical field, to be specifically related in a kind of intelligent substation two AD and to sample inconsistent determination methods.
Background technology
Along with the iterative method that intelligent substation is built, the intellectuality of primary equipment, the networking of secondary device, I/O electrical connection terminal sub-interface based on the secondary system of intelligent substation equipment of IEC61850 standard working-out is progressively replaced by network communication interface, distributed function is realized by network communication, instead of the secondary circuit of traditional transformer station, make the concept of secondary circuit there occurs huge change.
Require according to standard GB/T/T14285: " except exit relay; during arbitrary component wear in device; device does not answer misoperation to trip "; arbitrary each component wear in the equipment such as electronic mutual inductor (A/D sampling circuit), merge cells (MU), Fiber connection, intelligent terminal, process-level network switch in intelligent substation; except exit relay, protection misoperation should do not caused to trip.
The acquisition system of electronic mutual inductor and merge cells all belong to a part for protection system, should configure by dual principle.Electric mutual inductor planted agent by two-way independently sampling system gather, every road sampling system should adopt two AD system, and access merge cells, each merge cells exports two-way digital sample values and enters a set of protective device by same paths.
Should take measures, when preventing one of double A/D data inputted abnormal, cause protection misoperation.
Application number be 201410632886.1 patent documentation " a kind of intelligent substation relay protecting method of sampling based on two AD " disclose a kind of two AD and to sample inconsistent determination methods; namely by the absolute value of more two AD sampled data amplitude difference, if absolute value is greater than setting value, judge that two AD sampling is inconsistent.The difference of two-way AD sampled value that what the method compared is tightly, do not judge the validity of each road AD sampled value, therefore judged result is inaccurate.
Summary of the invention
To the invention provides in a kind of intelligent substation two AD to sample inconsistent determination methods, to solve two problem that AD inconsistent determination methods judged result is unreliable, accuracy rate is low in prior art.
For solving the problems of the technologies described above, in intelligent substation of the present invention, two AD inconsistent determination methods of sampling comprises the steps:
1) the two AD sampled value of tested electric parameters is obtained;
2) first-harmonic effective value and the real effective of the two every cycle of AD sampled value of tested electric parameters is calculated respectively;
3) judge that whether the two AD sampled value of tested electric parameters is effective, formula is: AD10>0.05In and AD20>0.05In, wherein, AD10 is the first-harmonic effective value of tested electric parameters first via AD sampled value, AD20 is the first-harmonic effective value of tested electric parameters second road AD sampled value, and In is tested electric parameters secondary load voltage value or current value;
4) if effectively, then judge that whether two AD sampled value is consistent, determination methods is: whether the absolute value of the two AD sampled value difference of more tested electric parameters is greater than setting threshold value, if be greater than, then judges that two AD sampled value is inconsistent.
Described step 4) in judgment formula be: | AD1-AD2|>K × AD2, wherein, AD1 is the real effective of tested electric parameters first via AD sampled value, and AD2 is the real effective of tested electric parameters second road AD sampled value, and K is threshold value of adjusting.
Described step 4) in determination methods be: if meet | AD1-AD2| > setting value × In and
then judge that two AD sampled value is inconsistent, wherein, AD1, AD2 are respectively two AD sampled values of same road voltage or electric current.
After judging that two AD sampled value is inconsistent, provide warning information and the two AD sampled value of record.
Before whether the two AD sampled value of judgement is consistent, first read relevant configuration information, judge whether effectively to adjust threshold value, whether criterion drops into, if threshold value of adjusting is invalid, or when criterion does not drop into, do not carry out the judgement whether two AD sampled value is consistent.
Described configuration information comprise sample frequency, tested electric parameters secondary ratings, threshold value of adjusting and two AD sample inconsistent criterion throw move back control word.
Technique effect of the present invention is: the method is before whether the two AD sampled value of judgement is consistent, first judge that whether each road AD sampled value is effective, and then compare two-way AD sampled value, judge that whether two AD sampled value is consistent, owing to first comparing the validity of each road AD sampled value, avoid because each road AD sampled value is invalid in deterministic process, and the two difference satisfies condition after comparing with setting threshold value, thus cause the possibility of erroneous judgement, so improve the accuracy of judgement.
The present invention also carries out real-time diagnosis alarm to two AD samplings of electric parameters in intelligent substation; intelligent substation operation maintenance personnel by this can the sampling abnormal conditions of Timeliness coverage electronic mutual inductor, merge cells etc., thus take necessary measure to reduce even to avoid to occur the serious consequence that false protection or tripping cause.Method of the present invention solve existing couple of AD sampling abnormal time without monitoring, no alarm, without historical data, thus affect the problem of power system security reliability service and fault analysis.
Accompanying drawing explanation
Fig. 1 is that two AD samples the process flow diagram of inconsistent determination methods;
Fig. 2 to sample inconsistent determination methods schematic diagram for two AD.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail.
As shown in Figure 1, two AD of the present embodiment inconsistent determination methods of sampling comprises the steps:
1) the two AD sampled value of tested electric parameters is obtained;
2) first-harmonic effective value and the real effective of the two every cycle of AD sampled value of tested electric parameters is calculated respectively;
3) judge that whether the two AD sampled value of tested electric parameters is effective, formula is: AD10>0.05 × In and AD20>0.05 × In, wherein, AD10 is the first-harmonic effective value of tested electric parameters first via AD sampled value, AD20 is the first-harmonic effective value of tested electric parameters second road AD sampled value, and In is tested electric parameters secondary load voltage value or current value;
4) if effectively, then judge that whether two AD sampled value is consistent, determination methods is: whether the absolute value of the two AD sampled value difference of more tested electric parameters is greater than setting threshold value, if be greater than, then judges that two AD sampled value is inconsistent.
The present embodiment can before two AD samples inconsistent judgement, can read sample frequency, tested electric parameters secondary ratings, threshold value of adjusting, two AD inconsistent criterion of sampling throws and move back the relevant configuration information such as control word, when threshold value is invalid, or when criterion does not drop into, then do not perform two AD and to sample inconsistent judgement.
For step 4) in determination methods, concrete judgment formula is: | AD1-AD2|>K × AD2, wherein, AD1 is the real effective of tested electric parameters first via AD sampled value, AD2 is the real effective of tested electric parameters second road AD sampled value, and K is threshold value of adjusting.
As other embodiments, as shown in Figure 2, step 4) in determination methods can be: if meet | AD1-AD2| > 0.05In and
then judge that two AD sampled value is inconsistent, wherein, AD1, AD2 are respectively two AD sampled values of same road voltage or electric current.
After judging that two AD sampled value is inconsistent, provide warning information and the two AD sampled value of record.Intelligent substation operation maintenance personnel by this can the sampling abnormal conditions of Timeliness coverage electronic mutual inductor, merge cells etc., thus take necessary measure to reduce even to avoid to occur the serious consequence that false protection or tripping cause.
The method of the present embodiment is applicable to the sampled data of any sample frequency, any type.
Above embodiment only understands core concept of the present invention for helping; the present invention can not be limited with this; for those skilled in the art; every according to thought of the present invention; the present invention is modified or equivalent replacement; any change done in specific embodiments and applications, all should be included within protection scope of the present invention.
Claims (6)
1. in intelligent substation, two AD samples an inconsistent determination methods, it is characterized in that, comprises the steps:
1) the two AD sampled value of tested electric parameters is obtained;
2) first-harmonic effective value and the real effective of the two every cycle of AD sampled value of tested electric parameters is calculated respectively;
3) judge that whether the two AD sampled value of tested electric parameters is effective, formula is: AD10>0.05In and AD20>0.05In, wherein, AD10 is the first-harmonic effective value of tested electric parameters first via AD sampled value, AD20 is the first-harmonic effective value of tested electric parameters second road AD sampled value, and In is tested electric parameters secondary load voltage value or current value;
4) if effectively, then judge that whether two AD sampled value is consistent, determination methods is: whether the absolute value of the two AD sampled value difference of more tested electric parameters is greater than setting threshold value, if be greater than, then judges that two AD sampled value is inconsistent.
2. two AD samples inconsistent determination methods in intelligent substation according to claim 1, it is characterized in that, described step 4) in judgment formula be: | AD1-AD2|>K × AD2, wherein, AD1 is the real effective of tested electric parameters first via AD sampled value, AD2 is the real effective of tested electric parameters second road AD sampled value, and K is threshold value of adjusting.
3. two AD samples inconsistent determination methods in intelligent substation according to claim 1, it is characterized in that, described step 4) in determination methods be: if meet
then judge that two AD sampled value is inconsistent, wherein, AD1, AD2 are respectively two AD sampled values of same road voltage or electric current.
4. two AD samples inconsistent determination methods in intelligent substation according to claim 1, it is characterized in that, after judging that two AD sampled value is inconsistent, provides warning information and the two AD sampled value of record.
5. two AD samples inconsistent determination methods in intelligent substation according to claim 1, it is characterized in that, before whether the two AD sampled value of judgement is consistent, first relevant configuration information is read, judge whether effectively to adjust threshold value, whether criterion drops into, if threshold value of adjusting is invalid, or criterion is not when dropping into, do not carry out the judgement whether two AD sampled value is consistent.
6. two AD samples inconsistent determination methods in intelligent substation according to claim 4, it is characterized in that, described configuration information comprises sample frequency, tested electric parameters secondary ratings, threshold value of adjusting and two AD inconsistent criterion of sampling and throws and move back control word.
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Cited By (7)
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| CN106487095A (en) * | 2016-10-28 | 2017-03-08 | 广东电网有限责任公司电力调度控制中心 | Relay protection on-line monitoring method based on redundancy relationship and system |
| CN107991641A (en) * | 2017-10-27 | 2018-05-04 | 中国电力科学研究院有限公司 | It is a kind of based on optical fiber current mutual inductor independently double sampled sampling method for detecting abnormality and system |
| CN109001661A (en) * | 2018-05-31 | 2018-12-14 | 上海思源弘瑞自动化有限公司 | The consistency of double sampled value determines method, apparatus, terminal device and storage medium |
| CN109541351A (en) * | 2018-11-29 | 2019-03-29 | 南京国电南自电网自动化有限公司 | The inconsistent method of discrimination of current sample and processing method in protective relaying device |
| CN110311349A (en) * | 2019-06-19 | 2019-10-08 | 南京南瑞继保工程技术有限公司 | A kind of method of relay protection redundancy sampling and anomalous discrimination |
| CN110794201A (en) * | 2019-10-25 | 2020-02-14 | 积成电子股份有限公司 | double-AD inconsistency quick judgment method based on two-point product method |
| CN111983309A (en) * | 2020-08-28 | 2020-11-24 | 武汉鸿阳机电工程有限公司 | Method and device for detecting abnormality of sampling data |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106487095A (en) * | 2016-10-28 | 2017-03-08 | 广东电网有限责任公司电力调度控制中心 | Relay protection on-line monitoring method based on redundancy relationship and system |
| CN107991641A (en) * | 2017-10-27 | 2018-05-04 | 中国电力科学研究院有限公司 | It is a kind of based on optical fiber current mutual inductor independently double sampled sampling method for detecting abnormality and system |
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| CN110794201A (en) * | 2019-10-25 | 2020-02-14 | 积成电子股份有限公司 | double-AD inconsistency quick judgment method based on two-point product method |
| CN110794201B (en) * | 2019-10-25 | 2021-10-19 | 积成电子股份有限公司 | double-AD inconsistency quick judgment method based on two-point product method |
| CN111983309A (en) * | 2020-08-28 | 2020-11-24 | 武汉鸿阳机电工程有限公司 | Method and device for detecting abnormality of sampling data |
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