CN104410042B - A kind of intelligent substation relay protecting method based on double AD samplings - Google Patents
A kind of intelligent substation relay protecting method based on double AD samplings Download PDFInfo
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- CN104410042B CN104410042B CN201410632886.1A CN201410632886A CN104410042B CN 104410042 B CN104410042 B CN 104410042B CN 201410632886 A CN201410632886 A CN 201410632886A CN 104410042 B CN104410042 B CN 104410042B
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Abstract
The present invention relates to a kind of intelligent substation relay protecting method based on double AD samplings, belong to Relay Protection Technology in Power System field.Double AD sampled datas that voltage or electric current combining unit export are introduced protection device by the present invention; wherein sampled data is used for protection act logical operation all the way; another way sampled data, which is used to protect, starts logical operation; the uniformity of double AD sampled datas is differentiated according to the relative deviation of the double AD sampled datas of two-way and absolute deviation; it is if inconsistent; the then locking protection exit related to this analog quantity, so as to realize the relay protection of intelligent substation.Invention not only avoids the error of double AD samplings, and there is higher sensitivity, the reliability of protection act can be improved, ensure that trip protection signal does not export in the case where double AD sampled datas are inconsistent.
Description
Technical field
The present invention relates to a kind of intelligent substation relay protecting method based on double AD samplings, belongs to power system relay guarantor
Protect technical field.
Background technology
Important support point of the intelligent substation as intelligent grid, secondary important as intelligent substation of relay protection are set
One of standby, it protects incorrect operation to electricity to ensureing that power system security reliability service plays vital effect
The harm of Force system is also huge.
Q/GDW441-2010《Intelligent substation Protection Technology specification》It is required that 220kV and above after
Electric protection should use duplicate system retrofit principle, and each combining unit output two-way digital sample values enter protection by same passage and filled
Put, simultaneously《Intelligent substation general technical specifications》Middle regulation protective relaying device should use the different sampled data of two-way, when
When certain circuit-switched data is invalid, protection device should alert, and reasonably retain or exit the defencive function of correlation.When one of double AD data are different
Chang Shi, protection device should take measures, and prevent protection misoperation.
During in order to prevent double AD sampled data any data exceptions, for export, classical way is to use two to false protection
The protection CPU module of block independence, two-way AD sampled datas be introduced into respectively two protection CPU modules in be respectively completed protection start and
Action logic computing, hardware interlock relation is formed, just allow trip protection to export only two block protection CPU are acted simultaneously when.Adopt
Hardware cost on the one hand can be increased with this pattern, on the other hand also easily because hardware interlock circuitry failure causes interlocking failure to be made
Into refused action or malfunction.
The content of the invention
It is an object of the invention to provide a kind of intelligent substation relay protecting method based on double AD samplings, to solve two-way
AD sampled datas are introduced into two protection CPU modules the hardware being respectively completed caused by protection startup and action logic computing respectively
The problem of cost is high and malfunctions.
The present invention provides a kind of intelligent substation relay protection side based on double AD samplings to solve above-mentioned technical problem
Method, the relay protecting method comprise the following steps：
1) double AD sampled datas that combining unit exports are accessed into protection device；
2) amplitude and phase information of double AD sampled datas are calculated；
3) relative deviation and absolute deviation of relatively more double AD sampled data amplitudes, if deviation exceedes setting value, judgement is adopted
Sample is abnormal, the locking protection exit related to this analog quantity, otherwise opens related protection act outlet logic.
Described double AD sampled datas are current data or voltage data.
If double AD sampled datas are current data, discriminate is in step 3)：
Wherein AD1, AD2 is respectively the amplitude of two-way current sampling data, InFor the secondary rated value of electric current.
If double AD sampled datas are voltage data, the discriminate in step 3) is：
Wherein AD1, AD2 is respectively the amplitude of two-way voltage sample data, UnFor rated line voltage.
One kind in double AD sampled datas is used for protection act logic discrimination, and another way starts logic for protection and sentenced
Not, 0.95 times that starting element definite value is protection act definite value is protected, it is ensured that in the case of double AD sampled datas are normal, protection is opened
It is dynamic preferable with action behavior uniformity.
If instantaneous latch-up protection after double AD sampled datas exceptions, the double AD samplings abnormality alarmings of delay 20ms hairs.
The beneficial effects of the invention are as follows:Double AD sampled datas that voltage or electric current combining unit export are introduced and protected by the present invention
Protection unit, wherein sampled data is used for protection act logical operation all the way, another way sampled data, which is used to protect, starts logic fortune
Calculate, the uniformity of double AD sampled datas is differentiated according to the relative deviation of the double AD sampled datas of two-way and absolute deviation, if differing
Cause, then the locking protection exit related to this analog quantity, so as to realize the relay protection of intelligent substation.The present invention not only avoids
The error of double AD samplings, and there is higher sensitivity, the reliability of protection act can be improved, in double AD sampled datas not
Ensure that trip protection signal does not export in the case of consistent.
Brief description of the drawings
Fig. 1 is protection device data-acquisition loop schematic diagram；
Fig. 2 is the logical schematic that double AD sampled datas are applied in relay protective scheme.
Embodiment
The embodiment of the present invention is further described below in conjunction with the accompanying drawings.
Present invention is mainly applied in the high-voltage relay protection device of intelligent substation, protection device is by each side Current Mutual Inductance
The sampled data of two CT windings of device introduces protection device simultaneously.Electronic current mutual inductor is carried out by two independent CT windings
Collection, each CT windings use the same combining unit of double A/D system access, one CT winding of each combining unit output
Two-way A/D digital sample values lead to process-level network and enter protection device, as shown in Figure 1.According to the two-way in access protection device
The relative deviations of double AD sampled datas and absolute deviation differentiate the uniformity of double AD sampled datas, and the detailed process of this method is such as
Under：
1. double AD sampled datas that combining unit is exported access protection device, as shown in Fig. 2 protection device here
Including protection act element, protection starting element and double AD sampled datas anomalous discrimination elements, double AD sampled datas anomalous discriminations
Element is carried out again together with protection act element and protection starting element after NOT gate computing and computing, operation result are to protect
The control signal of shield tripping operation outlet.
Wherein AD1 sampled datas access protection act element, for protection act logical operation, the access of AD2 sampled datas
Starting element is protected, starts logical operation for protecting, starting element action definite value is 0.95 times of protection act definite value, it is ensured that
In the case of double AD sampled datas are normal, protection starts and the uniformity of protection act is preferable, AD1 and AD2 sampled datas connect
Enter double AD sampled data anomalous discrimination elements.
2. the corresponding amplitude of AD1 and AD2 sampled datas and phase, AD1 hits are calculated by Fourier algorithm respectively
Start logical operation according to for protection act logical operation, AD2 sampled datas are used to protect.
3. compare relative deviation and the absolute deviation of the amplitude of AD1 and AD2 sampled datas to differentiate double AD sampled datas
Uniformity, deviation is excessive to be judged to sampled data exception, the locking protection exit related to this analog quantity, otherwise open related protection
Logic export.Here double AD sampled datas can be current data or voltage data, the discrimination formula of different pieces of information
Also it is different.
The double AD sampled data anomalous discrimination algorithms of electric current are as follows：
AD1, AD2 are respectively the amplitude of two-way current sampling data in formula, InFor the secondary rated value of electric current.
The double AD sampled data anomalous discrimination algorithms of voltage are as follows：
AD1, AD2 are respectively the amplitude of two-way voltage sample data in formula, UnFor rated line voltage.
4. instantaneous latch-up protection after pair AD sampled data exceptions, the double AD samplings abnormality alarmings of delay 20ms hairs.
5. the amplitude and phase of the double AD sampled datas of real-time display in a device, it can easily and intuitively view double AD and adopt
Sample data and whether the two abnormal.
Claims (4)
1. a kind of intelligent substation relay protecting method based on double AD samplings, it is characterised in that the relay protecting method includes
Following steps：
1) double AD sampled datas that combining unit exports are accessed into protection device；
2) amplitude and phase information of double AD sampled datas are calculated；
3) relative deviation and absolute deviation of relatively more double AD sampled data amplitudes, if deviation exceedes setting value, judge that sampling is different
Often, the locking protection exit related to this analog quantity, related protection act outlet logic is otherwise opened；
Described double AD sampled datas are current data, then discriminate is in step 3)：
Wherein AD1, AD2 is respectively the amplitude of two-way current sampling data, InFor the secondary rated value of electric current.
2. the intelligent substation relay protecting method according to claim 1 based on double AD samplings, it is characterised in that described
Double AD sampled datas be voltage data, then the discriminate in step 3) is：
Wherein AD1, AD2 is respectively the amplitude of two-way voltage sample data, UnFor rated line voltage.
3. the intelligent substation relay protecting method according to claim 1 or 2 based on double AD samplings, it is characterised in that
It is used for protection act logic discrimination all the way in double AD sampled datas, another way starts logic discrimination for protection, and protection is opened
Dynamic element definite value is 0.95 times of protection act definite value, it is ensured that in the case of double AD sampled datas are normal, protection starts and action
Behavior congruence is preferable.
4. the intelligent substation relay protecting method according to claim 1 or 2 based on double AD samplings, it is characterised in that
If instantaneous latch-up protection after double AD sampled datas exceptions, the double AD samplings abnormality alarmings of delay 20ms hairs.
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| CN201410632886.1A CN104410042B (en) | 2014-11-11 | 2014-11-11 | A kind of intelligent substation relay protecting method based on double AD samplings |
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| CN201410632886.1A CN104410042B (en) | 2014-11-11 | 2014-11-11 | A kind of intelligent substation relay protecting method based on double AD samplings |
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| CN104410042A CN104410042A (en) | 2015-03-11 |
| CN104410042B true CN104410042B (en) | 2018-02-02 |
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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 |
| 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 |
| CN106684838B (en) * | 2016-12-29 | 2019-05-14 | 许继集团有限公司 | Site relay protection controlling device and relay protecting method |
| 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 |
| CN106848996B (en) * | 2017-03-17 | 2020-02-21 | 云南电网有限责任公司 | Outlet protection method and device suitable for double-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 |
| 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 |
| CN109088400B (en) * | 2018-08-07 | 2020-08-11 | 许继集团有限公司 | Distributed protection 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 |
| 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 |
| CN109616998B (en) * | 2018-12-21 | 2020-06-09 | 南京国电南自电网自动化有限公司 | Method for judging and processing voltage inconsistency of relay protection device based on double CPU sampling |
| CN110311349B (en) * | 2019-06-19 | 2021-05-28 | 南京南瑞继保工程技术有限公司 | Relay protection redundant sampling and abnormity discrimination 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 |
| 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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| JP2011010886A (en) * | 2009-07-02 | 2011-01-20 | Hoya Corp | Electronic endoscope |
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| CN203399089U (en) * | 2013-07-10 | 2014-01-15 | 贵州电力试验研究院 | Bi-AD sampling loop for merging unit |
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