CN102856890B - Adaptive current differential protection method applied to high-compensation-degree series compensation system - Google Patents
Adaptive current differential protection method applied to high-compensation-degree series compensation system Download PDFInfo
- Publication number
- CN102856890B CN102856890B CN201210335431.4A CN201210335431A CN102856890B CN 102856890 B CN102856890 B CN 102856890B CN 201210335431 A CN201210335431 A CN 201210335431A CN 102856890 B CN102856890 B CN 102856890B
- Authority
- CN
- China
- Prior art keywords
- current
- differential protection
- electric current
- protection
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000003044 adaptive effect Effects 0.000 title abstract 3
- 230000004154 complement system Effects 0.000 claims description 11
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 230000004069 differentiation Effects 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000205 computational method Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides an adaptive current differential protection method applied to a high-compensation-degree series compensation system. The method includes: a protection starting element acts when a series compensation line fails; judging whether current is in phase reversal or not; if not, using a first current differential protection algorithm for recognition of internal and external faults; if yes, using a second current differential protection algorithm for recognition of internal and external faults; and obtaining protection action characteristics in different states according to different differential protection algorithms. Using the adaptive current differential protection method can improve sensitivity of current differential protection in current reversal of internal faults of the high-compensation-degree series compensation system, prevent differential protection refused actions, and improve safety and reliability in system operation.
Description
Technical field
The invention belongs to transmission line field, specifically relate to one and be applicable to the reverse differential protecting method of high compensativity string complement system (" high compensativity " refers to the compensated transmission system that compensativity is greater than 50%) electric current.
Background technology
Modern transmission system, in order to improve its transmission capacity and steady state stability limit, adopts the mode installing series compensation capacitance additional to realize usually.Install the transmission system after series compensation capacitance additional and be called string complement system.The ratio of series compensation capacitance capacitor value and total track length resistance value is called the compensativity of circuit.Along with the enhancing of system, the equivalent system impedance value to serial supplementary line two ends bus also reduces gradually.When serial compensation capacitance capacitor value is greater than institute's installation side bus equivalence system impedance value, go here and there mend egress line trackside occur single-phase through high resistance earthing fault time, there will be the reverse phenomenon of electric current, namely flow to the electric current advanced system equivalent electrical source voltage (after should be current hysteresis without the string added time equivalent electromotive force) of fault point from bus.This fault signature has a strong impact on the performance of differential current protection, tripping when can cause differential current protection zone internal fault under serious conditions.Namely content of the present invention is the solution proposed for this practical problem.
Summary of the invention
For improving the sensitivity of differential current protection action when serial supplementary line troubles inside the sample space electric current is reverse, the invention provides and a kind ofly be applicable to the reverse self adaptation differential protecting method of serial supplementary line electric current.Effectively can be improved the sensitivity of serial supplementary line differential current protection when high resistance ground causes electric current reverse by the method, prevent the refused action of protection component.
For achieving the above object, the invention provides one and be applicable to high compensativity string complement system self-adaptive current differential protecting method, it is characterized in that, described differential current protection method comprises the following steps:
(1). serial supplementary line breaks down, then protection starting element movement;
(2). judge that whether the electric current in serial supplementary line is anti-phase;
(3) if. be judged to not occur electric current reverse, then in current differential protection algorithm, utilize following formula to carry out internal fault external fault identification;
Described electric current
for the steady-state value of circuit both sides phase current.K value is ratio brake coefficient.
(4) if. be judged to there occurs electric current reverse, then in current differential protection algorithm, utilize following formula to carry out internal fault external fault identification;
Described electric current
for the steady-state value of circuit both sides phase current.K value is ratio brake coefficient.
(5). draw string complement system current differential protection operating characteristics under electric current positive or anti-phase two kinds of situations according to current differential protection algorithms different in step (3), (4).
The invention provides in technical scheme, in described step 3, utilize formula
(wherein k value is taken as 0.6) is as protection act criterion.
The invention provides in technical scheme, in described step 4, utilize formula
(wherein k value is taken as 1/3) is as protection act criterion.
In selecting technology scheme provided by the invention, described electric current is the steady-state value of circuit both sides phase current.
Compared with the prior art; one provided by the invention be applicable to high compensativity string complement system electric current reverse time current differential protection method; can improve troubles inside the sample space electric current reverse time protection act sensitivity, prevent the tripping of differential protection, bring favorable influence to relay protection of transmission line.
Accompanying drawing explanation
Fig. 1 is high compensativity string complement system serial supplementary line fault schematic diagram;
Fig. 2 is serial supplementary line electric current reverse self adaptation differential protection calculation process.
Embodiment
According to Figure of description, technical scheme of the present invention is described in further details below.
Be illustrated in figure 1 high compensativity string complement system serial supplementary line fault schematic diagram.
Be illustrated as two ends power-supply system, E1 and E2 is respectively sending end and receiving end power supply; M, N are respectively two side bus; Serial compensation capacitance C is installed on the outlet of M side bus, and compensativity (ratio of serial compensation capacitance and line inductance) is greater than 50%; Fault point string mend and to side bus between; M side protection electric current is for flow to circuit by bus M, and N side protection electric current is for flow to circuit by bus N.
Be illustrated in figure 2 serial supplementary line electric current reverse self adaptation differential protection calculation process, one is applicable to high compensativity string complement system self-adaptive current differential protecting method, comprises the following steps:
(1). serial supplementary line breaks down, then protection starting element movement;
(2). utilize the reverse method of discrimination of electric current to carry out the reverse differentiation of electric current;
(3) if. be judged to not occur electric current reverse, then utilize formula in current differential protection algorithm
(wherein k value is taken as 0.6) carries out internal fault external fault identification as protection act criterion; This criterion when electric current do not occur electric current reverse, have higher sensitivity for troubles inside the sample space.
(4) if. be judged to there occurs electric current reverse, then utilize formula in current differential protection algorithm
(wherein k value is taken as 1/3) carries out internal fault external fault identification as protection act criterion; This criterion, when electric current generation electric current is reverse, has higher sensitivity for troubles inside the sample space.
(5). draw protection act characteristic according to different computational methods.
By step 3 and 4, the differential algorithm under different situations is optimized, can improve high compensativity system generation electric current oppositely after, the sensitivity of differential protection.
After serial supplementary line fault, protection starting element movement.This side is utilized to protect collection electric parameters whether the reverse differentiation of electric current occurs.According to differentiation result, utilize the electric current of protection installation place and the protected circuit offside collected
with
carry out different differential protection property calculation and compare, obtaining differential differentiation result.
It is to be understood that content of the present invention and embodiment are intended to the practical application proving technical scheme provided by the present invention, should not be construed as limiting the scope of the present invention.Those skilled in the art inspired by the spirit and principles of the present invention, can do various amendment, equivalent replacement or improve.But these changes or amendment are all in the protection range that application is awaited the reply.
Claims (1)
1. be applicable to a high compensativity string complement system self-adaptive current differential protecting method, it is characterized in that, described differential current protection method comprises the following steps:
(1). serial supplementary line breaks down, then protection starting element movement;
(2). judge that whether the electric current in serial supplementary line is reverse;
(3) if. be judged to not occur electric current reverse, then in current differential protection algorithm, utilize following formula to carry out internal fault external fault identification;
wherein in this formula, k value is taken as 0.6;
Described electric current
for the steady-state value of circuit both sides phase current, k value is ratio brake coefficient;
(4) if. be judged to there occurs electric current reverse, then in current differential protection algorithm, utilize following formula to carry out internal fault external fault identification;
wherein in this formula, k value is taken as
Described electric current
for the steady-state value of circuit both sides phase current, k value is ratio brake coefficient;
(5). draw string complement system current differential protection operating characteristics under electric current forward or backwards two kinds of situations according to current differential protection algorithms different in step (3), (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210335431.4A CN102856890B (en) | 2012-09-11 | 2012-09-11 | Adaptive current differential protection method applied to high-compensation-degree series compensation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210335431.4A CN102856890B (en) | 2012-09-11 | 2012-09-11 | Adaptive current differential protection method applied to high-compensation-degree series compensation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102856890A CN102856890A (en) | 2013-01-02 |
| CN102856890B true CN102856890B (en) | 2015-05-13 |
Family
ID=47403201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210335431.4A Active CN102856890B (en) | 2012-09-11 | 2012-09-11 | Adaptive current differential protection method applied to high-compensation-degree series compensation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102856890B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296648B (en) * | 2013-05-19 | 2016-09-14 | 国家电网公司 | The transmission line of electricity compositeresistant differential protection method of the anti-phase impact of anti-current |
| CN103296647B (en) * | 2013-05-19 | 2016-06-01 | 国家电网公司 | Directional current differential protection method of power transmission line |
| CN103762564B (en) * | 2014-01-14 | 2016-10-19 | 昆明理工大学 | A kind of transient energy direction protection method of band SSSC transmission line of electricity |
| CN103779845B (en) * | 2014-02-14 | 2017-03-08 | 华北电网有限公司 | A kind of method improving serial supplementary line current differential protection performance |
| CN104201658B (en) * | 2014-09-17 | 2018-01-19 | 国家电网公司 | A kind of differential guard method of transmission line of electricity based on virtual stalling current |
| CN105576623B (en) | 2016-01-29 | 2020-01-17 | 中国电力科学研究院 | Self-adaptive half-wavelength line differential protection method based on time difference method |
| CN105929304B (en) * | 2016-05-11 | 2019-03-01 | 中国南方电网有限责任公司 | A method of electric current occurs for protection installation place reversed when assessment serial supplementary line failure |
| CN106646124B (en) * | 2016-12-09 | 2019-03-26 | 国网江苏省电力公司淮安供电公司 | A kind of feeder fault self-adapting diagnostic method of Thief zone distributed generation resource |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034802A (en) * | 2007-04-24 | 2007-09-12 | 北京四方继保自动化股份有限公司 | Impedance protection method of serial compensation capacitance direction based on the voltage compensation |
| CN101651338A (en) * | 2009-08-20 | 2010-02-17 | 北京四方继保自动化股份有限公司 | Method for protecting negative sequence current differential |
| CN101667726A (en) * | 2009-08-20 | 2010-03-10 | 北京四方继保自动化股份有限公司 | Positive sequence current differential protection method |
| CN102570418A (en) * | 2011-12-20 | 2012-07-11 | 中国电力科学研究院 | Method and device for identifying current inverting of series compensated line |
-
2012
- 2012-09-11 CN CN201210335431.4A patent/CN102856890B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034802A (en) * | 2007-04-24 | 2007-09-12 | 北京四方继保自动化股份有限公司 | Impedance protection method of serial compensation capacitance direction based on the voltage compensation |
| CN101651338A (en) * | 2009-08-20 | 2010-02-17 | 北京四方继保自动化股份有限公司 | Method for protecting negative sequence current differential |
| CN101667726A (en) * | 2009-08-20 | 2010-03-10 | 北京四方继保自动化股份有限公司 | Positive sequence current differential protection method |
| CN102570418A (en) * | 2011-12-20 | 2012-07-11 | 中国电力科学研究院 | Method and device for identifying current inverting of series compensated line |
Non-Patent Citations (2)
| Title |
|---|
| 一种灵敏可靠的输电线路电流差动保护判据;王海港等;《电网技术》;20060531;第30卷(第10期);第90-93页 * |
| 电力电缆光纤纵差保护判据仿真;董雪源;《中国优秀硕士学位论文全文数据库》;20071231;正文第8-10、26-40页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102856890A (en) | 2013-01-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102856890B (en) | Adaptive current differential protection method applied to high-compensation-degree series compensation system | |
| CN102427223B (en) | Method for judging lock by zero sequence voltage and current | |
| CN105337256B (en) | A kind of residual voltage compensating element, blocking method for multiple-circuit on same tower | |
| CN106981861B (en) | Method for preventing misoperation in longitudinal fault zero-sequence longitudinal protection of double-circuit lines on same tower | |
| CN103730906A (en) | Method for coordination control over restraint in mixed direct-current transmission phase-commutation failure | |
| CN102868150B (en) | Full-current differential protection braking coefficient adaptive regulating method for transmission line | |
| CN103633629B (en) | Guard method based on wavelet transformation and the HVDC transmission line of energy spectrum analysis | |
| CN103595032B (en) | Method for the zero-sequence direction component locking for the multiple-circuit on same tower that do not replace | |
| CN103219712A (en) | Power transmission line one-phase malfunction property identification method based on natural frequency | |
| CN106571620B (en) | A kind of failure judgment method of both-end direct current line of flexible direct current power transmission ground short circuit | |
| CN105044543A (en) | Electric reactor fault determination method after PT disconnection | |
| CN103675538B (en) | A kind of utilization recovers single fault distinguishing method forever that voltage power frequency detects | |
| CN101183789B (en) | Method for setting compound characteristic impedance suitable for series capacity compensation circuit | |
| CN103048567A (en) | Method for judging parallel reactor-containing transmission line malfunction properties based on wave form estimation | |
| CN105071355A (en) | Differential protection method of long-distance ultra-high voltage direct-current (UHV DC) transmission line | |
| CN104600679B (en) | A kind of traction substation current protection method of feeder line | |
| CN108493903B (en) | Voltage-free energy-pumping reactor differential protection method and device | |
| CN108120902B (en) | Method for rapidly judging transmission line fault | |
| CN101106266A (en) | A method for realizing transformer protection based on guiding nano principle | |
| CN100557915C (en) | Serial compensation capacitance directional impedance protection method based on voltage compensation | |
| CN103779835A (en) | Transformer winding turn-to-turn short circuit relay protection method based on iron loss reactive power characteristic | |
| CN113488972B (en) | High-voltage direct-current transmission line protection method and system based on current time domain accumulation | |
| CN109103846B (en) | Energy extraction reactor protection method and system based on phase comparison and amplitude comparison principle | |
| CN103296648B (en) | The transmission line of electricity compositeresistant differential protection method of the anti-phase impact of anti-current | |
| CN103151764B (en) | Electric transmission line one-phase grounding fault full-component voltage protection method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |