CN104410042A - Intelligent substation relay protection method based on double AD sampling - Google Patents
Intelligent substation relay protection method based on double AD sampling Download PDFInfo
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Abstract
The invention relates to an intelligent substation relay protection method based on double AD sampling and belongs to the technical field of relay protection of electric power systems. The intelligent substation relay protection method based on double AD sampling includes that leading double AD sampling data output from a voltage or current merging unit into a protection device, wherein one path of sampling data is used for protecting logic operation while the other path of sampling data is used for protecting the logic operation starting, judging the consistency between the double AD sampling data according to the relative deviation and absolute deviation between the two paths of double AD sampling data, if the double AD sampling data are inconsistent, closing a protection outlet related to the analog quantity so as to realize the intelligent substation relay protection. The intelligent substation relay protection method based on double AD sampling avoids the double AD sampling error, has high sensitivity and is capable of improving the protection reliability and protecting trip signals from output when the double AD sampling data are inconsistent.
Description
Technical field
The present invention relates to a kind of intelligent substation relay protecting method of sampling based on two AD, belong to Relay Protection Technology in Power System field.
Background technology
Intelligent substation is as the important support point of intelligent grid; relaying protection is as one of important secondary device of intelligent substation; it plays vital effect to guarantee power system security reliability service, but protection incorrect operation is also huge to the harm of electric power system.
Q/GDW441-2010 " intelligent substation Protection Technology specification " requirement; the relaying protection of 220kV and above should adopt duplicate system retrofit principle; each merge cells exports two-way digital sample values and enters protective device by same passage; the sampled data that in " intelligent substation general technical specifications ", regulation protective relaying device should adopt two-way different simultaneously; when certain circuit-switched data is invalid; alarm answered by protective device, reasonably retains or exits relevant defencive function.When one of two AD data are abnormal, protective device should be taken measures, and prevents protection misoperation.
During in order to prevent two AD sampled data arbitrary data exception; false protection for export; classical way is that employing two pieces independently protects CPU module; two-way AD sampled data is introduced respectively in two protection CPU module and is completed protection startup and action logic computing respectively; form hardware interlock relation, only have during two block protection CPU action simultaneously and just allow trip protection outlet.Adopt this pattern can increase hardware cost on the one hand, another aspect is also easy causes refused action or misoperation because hardware interlock circuitry fault causes interlocking inefficacy.
Summary of the invention
The object of this invention is to provide a kind of intelligent substation relay protecting method of sampling based on two AD, introduce respectively in two protection CPU module and complete protection to solve two-way AD sampled data respectively and to start and the hardware cost that causes of action logic computing is high and the problem of misoperation.
The present invention is for solving the problems of the technologies described above and providing a kind of intelligent substation relay protecting method of sampling based on two AD, and this relay protecting method comprises the following steps:
1) two AD sampled datas that merge cells exports all are accessed protective device;
2) amplitude and the phase information of two AD sampled data is calculated;
3) relative deviation of more two AD sampled data amplitude and absolute deviation, if deviation exceedes set point, then judges that sampling is abnormal, the locking protection exit that analog quantity is relevant therewith, otherwise open relevant protection act outlet logic.
Described two AD sampled datas are current data or voltage data.
If described two AD sampled data is current data, then step 3) in discriminant be:
Wherein AD1, AD2 are respectively the amplitude of two-way current sampling data, I
nfor electric current secondary rated value.
If described two AD sampled data is voltage data, then step 3) in discriminant be:
Wherein AD1, AD2 are respectively the amplitude of two-way voltage sample data, U
nfor rated line voltage.
One in described pair of AD sampled data differentiates for the protection of action logic; another road is the differentiation of protection enable logic; protection starting component definite value is 0.95 times of protection act definite value, and under guaranteeing two normal situation of AD sampled data, protection starts with action behavior consistency better.
If the abnormal rear instantaneous latch-up protection of described two AD sampled data, time delay 20ms sends out two AD sampling abnormality alarming.
The invention has the beneficial effects as follows: two AD sampled datas that voltage or electric current merge cells export are introduced protective device by the present invention; wherein a road sampled data is for the protection of action logic computing; another road sampled data is for the protection of enable logic computing; the consistency of two AD sampled data is differentiated according to the relative deviation of the two AD sampled data of two-way and absolute deviation; if inconsistent; the then locking protection exit that analog quantity is relevant therewith, thus realize the relaying protection of intelligent substation.Invention not only avoids the error of two AD sampling, and there is higher sensitivity, the reliability of protection act can be improved, ensure that trip protection signal does not export when two AD sampled data is inconsistent.
Accompanying drawing explanation
Fig. 1 is protective device data-acquisition loop schematic diagram;
Fig. 2 is the logical schematic that two AD sampled data is applied in relay protective scheme.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
The present invention is mainly used in the high-voltage relay protective device of intelligent substation, and the sampled data of each side current transformer two CT windings is introduced protective device by protective device simultaneously.Electronic current mutual inductor by two independently CT winding gather; each CT winding adopts the same merge cells of double A/D system access; the two-way A/D digital sample values that each merge cells exports a CT winding is led to process-level network and is entered protective device, as shown in Figure 1.Differentiate the consistency of two AD sampled data according to the relative deviation of the two AD sampled data of two-way in access protective device and absolute deviation, the detailed process of the method is as follows:
1. two AD sampled datas that merge cells exports all are accessed protective device; as shown in Figure 2; here protective device comprises protection act element, protection starting component and two AD sampled data anomalous discrimination element; two AD sampled data anomalous discrimination element carries out and computing with protecting together with starting component with protection act element after not gate computing again, and operation result is the control signal of trip protection outlet.
Wherein AD1 sampled data access protection act element; for the protection of action logic computing; AD2 sampled data access protection starting component; for the protection of enable logic computing; starting component action definite value is 0.95 times of protection act definite value; under guaranteeing two normal situation of AD sampled data, the consistency of protection startup and protection act is better, AD1 and AD2 sampled data all accesses two AD sampled data anomalous discrimination element.
2. calculate the corresponding amplitude of AD1 and AD2 sampled data and phase place respectively by Fourier algorithm, AD1 sampled data is for the protection of action logic computing, and AD2 sampled data is for the protection of enable logic computing.
3. compare the consistency that the relative deviation of the amplitude of AD1 and AD2 sampled data and absolute deviation differentiate two AD sampled data, deviation is excessive, and to be judged to sampled data abnormal, the locking protection exit that analog quantity is relevant therewith, otherwise open relevant relay protective scheme outlet.Here two AD sampled datas can be current data, also can be voltage datas, and the discrimination formula of different pieces of information is also different.
The two AD sampled data anomalous discrimination algorithm of electric current is as follows:
In formula, AD1, AD2 are respectively the amplitude of two-way current sampling data, I
nfor electric current secondary rated value.
The two AD sampled data anomalous discrimination algorithm of voltage is as follows:
In formula, AD1, AD2 are respectively the amplitude of two-way voltage sample data, U
nfor rated line voltage.
4. the abnormal rear instantaneous latch-up protection of pair AD sampled data, time delay 20ms sends out two AD sampling abnormality alarming.
5. the amplitude of the two AD sampled data of in real time display and phase place in a device, can view two AD sampled data easily and intuitively and whether the two is abnormal.
Claims (6)
1. based on the intelligent substation relay protecting method that two AD samples, it is characterized in that, this relay protecting method comprises the following steps:
1) two AD sampled datas that merge cells exports all are accessed protective device;
2) amplitude and the phase information of two AD sampled data is calculated;
3) relative deviation of more two AD sampled data amplitude and absolute deviation, if deviation exceedes set point, then judges that sampling is abnormal, the locking protection exit that analog quantity is relevant therewith, otherwise open relevant protection act outlet logic.
2. intelligent substation relay protecting method of sampling based on two AD according to claim 1, is characterized in that, described two AD sampled datas are current data or voltage data.
3. intelligent substation relay protecting method of sampling based on two AD according to claim 2, is characterized in that, if described two AD sampled data is current data, then step 3) in discriminant be:
Wherein AD1, AD2 are respectively the amplitude of two-way current sampling data, I
nfor electric current secondary rated value.
4. intelligent substation relay protecting method of sampling based on two AD according to claim 2, is characterized in that, if described two AD sampled data is voltage data, then step 3) in discriminant be:
Wherein AD1, AD2 are respectively the amplitude of two-way voltage sample data, U
nfor rated line voltage.
5. the intelligent substation relay protecting method of sampling based on two AD according to claim 3 or 4; it is characterized in that; one in described pair of AD sampled data differentiates for the protection of action logic; another road is the differentiation of protection enable logic; protection starting component definite value is 0.95 times of protection act definite value; under guaranteeing two normal situation of AD sampled data, protection starts with action behavior consistency better.
6. the intelligent substation relay protecting method of sampling based on two AD according to claim 3 or 4, is characterized in that, if the abnormal rear instantaneous latch-up protection of described two AD sampled data, time delay 20ms sends out two AD sampling abnormality alarming.
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044447A (en) * | 2015-08-27 | 2015-11-11 | 许继集团有限公司 | Double AD real-time monitoring acquisition circuit |
| CN105510754A (en) * | 2016-01-22 | 2016-04-20 | 许昌许继软件技术有限公司 | Dual AD sampling inconsistency judging method for intelligent substation |
| CN106655076A (en) * | 2016-12-29 | 2017-05-10 | 许继集团有限公司 | On-site relay protection reliability control apparatus and relay protection method |
| CN106684838A (en) * | 2016-12-29 | 2017-05-17 | 许继集团有限公司 | Local relay protection control device and relay projection method |
| CN106848996A (en) * | 2017-03-17 | 2017-06-13 | 云南电网有限责任公司 | A kind of protection exit method and device suitable for dual-cpu structure |
| CN107276011A (en) * | 2017-05-10 | 2017-10-20 | 许继电气股份有限公司 | A kind of protection device |
| 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 |
| CN109088400A (en) * | 2018-08-07 | 2018-12-25 | 许继集团有限公司 | A kind of distribution protecting method and system |
| CN109142839A (en) * | 2018-08-21 | 2019-01-04 | 南京南瑞继保电气有限公司 | A kind of binary channels mutually verifies electronic mutual inductor |
| 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 |
| CN109616998A (en) * | 2018-12-21 | 2019-04-12 | 南京国电南自电网自动化有限公司 | The inconsistent differentiation processing method of protective relaying device voltage based on dual processors sampling |
| 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 |
| CN110927436A (en) * | 2019-11-05 | 2020-03-27 | 成都智达电力自动控制有限公司 | Current channel sampling abnormity detection method of transformer substation relay protection device |
| CN110988515A (en) * | 2019-11-06 | 2020-04-10 | 汪祺航 | Voltage channel sampling abnormity detection method of transformer substation relay protection device |
| CN112230700A (en) * | 2020-09-29 | 2021-01-15 | 许继电源有限公司 | Output voltage control device |
| CN113050476A (en) * | 2021-02-26 | 2021-06-29 | 许继集团有限公司 | High-precision ADC acquisition control system suitable for double-MCU hardware architecture |
| CN114583657A (en) * | 2021-12-31 | 2022-06-03 | 国电南京自动化股份有限公司 | Relay protection starting method for improving reliability of single-CPU double-AD sampling system |
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| CN105044447B (en) * | 2015-08-27 | 2018-05-11 | 许继集团有限公司 | Double AD monitor Acquisition Circuit in real time |
| CN105044447A (en) * | 2015-08-27 | 2015-11-11 | 许继集团有限公司 | Double AD real-time monitoring acquisition circuit |
| CN105510754A (en) * | 2016-01-22 | 2016-04-20 | 许昌许继软件技术有限公司 | Dual AD sampling inconsistency judging method for intelligent substation |
| CN106655076B (en) * | 2016-12-29 | 2019-05-14 | 许继集团有限公司 | Site reliability of relay protection control device and relay protecting method |
| CN106655076A (en) * | 2016-12-29 | 2017-05-10 | 许继集团有限公司 | On-site relay protection reliability control apparatus and relay protection method |
| CN106684838A (en) * | 2016-12-29 | 2017-05-17 | 许继集团有限公司 | Local relay protection control device and relay projection method |
| CN106848996A (en) * | 2017-03-17 | 2017-06-13 | 云南电网有限责任公司 | A kind of protection exit method and device suitable for dual-cpu structure |
| CN107276011A (en) * | 2017-05-10 | 2017-10-20 | 许继电气股份有限公司 | A kind of protection device |
| 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 |
| CN109001661B (en) * | 2018-05-31 | 2021-02-09 | 上海思源弘瑞自动化有限公司 | Method and device for determining consistency of double sampling values, terminal equipment and storage medium |
| CN109088400A (en) * | 2018-08-07 | 2018-12-25 | 许继集团有限公司 | A kind of distribution protecting method and system |
| CN109142839A (en) * | 2018-08-21 | 2019-01-04 | 南京南瑞继保电气有限公司 | A kind of binary channels mutually verifies electronic mutual inductor |
| 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 |
| CN109541351B (en) * | 2018-11-29 | 2020-12-29 | 南京国电南自电网自动化有限公司 | Current sampling inconsistency judging method and processing method in relay protection device |
| CN109616998A (en) * | 2018-12-21 | 2019-04-12 | 南京国电南自电网自动化有限公司 | The inconsistent differentiation processing method of protective relaying device voltage based on dual processors sampling |
| 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 |
| WO2020253301A1 (en) * | 2019-06-19 | 2020-12-24 | 南京南瑞继保电气有限公司 | Method for redundant sampling and abnormality determination for relay protection |
| 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 |
| CN110927436A (en) * | 2019-11-05 | 2020-03-27 | 成都智达电力自动控制有限公司 | Current channel sampling abnormity detection method of transformer substation relay protection device |
| CN110988515A (en) * | 2019-11-06 | 2020-04-10 | 汪祺航 | Voltage channel sampling abnormity detection method of transformer substation relay protection device |
| CN112230700A (en) * | 2020-09-29 | 2021-01-15 | 许继电源有限公司 | Output voltage control device |
| CN113050476A (en) * | 2021-02-26 | 2021-06-29 | 许继集团有限公司 | High-precision ADC acquisition control system suitable for double-MCU hardware architecture |
| CN114583657A (en) * | 2021-12-31 | 2022-06-03 | 国电南京自动化股份有限公司 | Relay protection starting method for improving reliability of single-CPU double-AD sampling system |
| CN114583657B (en) * | 2021-12-31 | 2023-12-22 | 国电南京自动化股份有限公司 | Relay protection starting method for improving reliability of single-CPU double AD sampling system |
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