CN101345410A - Design method for judging out-of-step separation based on application compensating impedance principle - Google Patents
Design method for judging out-of-step separation based on application compensating impedance principle Download PDFInfo
- Publication number
- CN101345410A CN101345410A CNA2008100219329A CN200810021932A CN101345410A CN 101345410 A CN101345410 A CN 101345410A CN A2008100219329 A CNA2008100219329 A CN A2008100219329A CN 200810021932 A CN200810021932 A CN 200810021932A CN 101345410 A CN101345410 A CN 101345410A
- Authority
- CN
- China
- Prior art keywords
- line
- phasor
- impedance
- circuit
- voltage
- 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.)
- Granted
Links
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a design method for judging out-of-step separation based on application impedance compensation principle. The design method can automatically obtain the real-time impedance value of the line; use the impedance compensation principle to judge out-of-step separation method according to the real-time impedance value as a line compensating impedance value and automatically identify whether the power system on the two sides of the tie line is in an out-of-step oscillation state, the out-of-step center is on the line, and correspondingly open and lock the implement of the out-of-step separation controlled action, thereby achieving the out-of-step separation control which are safe, reliable and fast action and preventing power system stabilization destruction and large area blackout caused by emergent events.
Description
Technical field
The present invention relates to a kind of power domain autocontrol method, especially relate to a kind of method for designing of judging the step-out off-the-line based on application compensating impedance principle.
Background technology
Construction along with extra-high voltage grid, contact between each regional power grid is strengthened greatly, stability characteristic (quality) is complicated more, press for the grid disconnection control technology under the further investigation dire emergency, comprise the adaptability research of traditional off-the-line criterion, the coordination Research on Control of different section off-the-line, the research of off-the-line control new criterion etc.
The off-the-line controlling schemes of tradition criterion design exists more problem.(1) criterion only can reflect a class or a few class step-out characteristic, and most criterions are imperfection also; (2) present most of criterion all is at two machine systems, and for the multifrequency asynchronous oscillation, criterion may lose efficacy, and when serious the system stability situation is worsened more; (3) in the complicated electric power system, the parameter tuning of device is difficulty very, even can't adjust; (4) the cooperation difficulty between the disconnection device of the many covers in system.Because all adopting to measure on the spot, these criterions judge, under the interconnected situation of big electrical network, the step-out disconnection device between adjacent sites cooperates comparatively difficulty, even there is assistant criteria to judge the active region scope, also be to judge qualitatively, mostly can only lean on by the overreach remedy such and insufficient.Thereby in the complicated electric power system, the step-out off-the-line criterion of measuring based on this locality is difficult to satisfy simultaneously rapidity and selectivity.
How effectively distant place electric parameters is combined with electric parameters on the spot, correctly describe and the detection system oscillatory occurences, being one is worth the problem furtherd investigate.In addition, even also focus mostly on the interconnection of oscillation center place, implementing off-the-line for the research of step-out off-the-line.Generally, system must implement off-the-line in oscillation center during step-out, and traditional step-out disconnection device is all can accurately judge the necessary condition that oscillation center is a control action.But formation along with the gaint power system of China's national network, and the construction of extra-high voltage grid, originally weak regional power grid of getting in touch, electrical link is tight day by day, oscillation center is not often on the contact section, this just makes the configuration of step-out disconnection device, and adjusting of parameter all can be brought new challenge.Actual electric network is in service, and the situation of having calmed down the system power vibration after the interconnection off-the-line of oscillation center has effectively taken place not to be in.Off-the-line control problem when interconnection is in the non-oscillatory center presses for research.
The phasor measuring technique of widely using is the important method that solves Da Qu interconnected network step-out off-the-line control problem at present, but for various reasons, the wide area phasor measuring technique is not applied to mainly still be applied in electrical network analysis and monitoring field in the real-time power network control as yet at present.But intuitively, whether the center that can accurately discern asynchronous oscillation based on the step-out off-the-line criterion of circuit both end voltage phasor is positioned on this circuit, thus total length that can protection circuit.Because it has clear and definite protection range, thereby can solve in the complication system matching problem of step-out disconnection device between adjacent sites.
At present, how to obtain has 2 kinds based on circuit both end voltage phasor main method, and first method is to adopt compensation principle, existing employing in engineering at present, briefly be exactly according to the line impedance value of adjusting in advance,, obtain the voltage phasor of offside according to the voltage and current phasor of this side.Second method is to adopt PMU (Phasor Measurement Unit) phasor measuring set, by synchronous time mark and high-speed communication system, obtains the voltage phasor of circuit both sides simultaneously.Two kinds of methods respectively have pluses and minuses, it is simple, reliable that the former installs realization, one-sided judgement, do not relate to communication system, meet the requirement of three lines of defence reliability, but owing to relate to prior impedance setting, the adaptability that electric network composition is changed is not enough, and in some network, the precise impedance value also is difficult to calculate; The latter is owing to be to calculate circuit both sides voltage phasor in real time, strong to the electric network composition adaptive capacity, there is not the definite value that to adjust, but device is realized complicated, needs bilateral to install, and synchronous time mark is required high, high-speed communication system is required high, in case communication accident or synchronised clock failure accidents take place, will cause device to withdraw from fully, do not satisfy the three lines of defence reliability requirement.
If comprehensively the advantage of above-mentioned two kinds of methods will provide an otherwise effective technique outlet for the step-out off-the-line control problem that solves existing Da Qu interconnected network.
Summary of the invention
1, goal of the invention
The objective of the invention is: the real-time impedance value that obtains circuit automatically, and according to this real-time impedance as the line build-out resistance value, utilization is judged step-out off-the-line method based on compensating impedance principle, automatically whether the electric power system of identification interconnection both sides is in the asynchronous oscillation state, whether the asynchronous oscillation center is on this circuit, and the execution of correspondingly open or locking step-out off-the-line control action.
2, technical scheme
To achieve these goals, the present invention takes following technical scheme to realize.This technical scheme comprises the following steps:
(1) is installed in the step-out disconnection device that the circuit both sides have synchronised clock, uses wherein measurement module to measure the circuit both sides in real time and unify busbar voltage phasor V1, V2 and line current phasor I1, I2 under the markers;
(2) by the high-speed communication module of step-out disconnection device itself and the high-speed communication network of electric power system, target voltage phasor and electric current phasor when the both sides device exchanges the band that collects;
(3) real-time computational scheme equivalent impedance Z=2 (V1-V2)/(I1+I2) according to the Z that calculates, preserves the compensating impedance Z as circuit
L
(4), just refresh this compensating impedance value if communication is normal always; If communication abnormality, the last resistance value of the preservation just often of then will communicating by letter is as this line build-out resistance value;
(5) according to the line build-out resistance value Z that obtains
L, a side voltage and current phasor V1, I1, can calculate the voltage phasor V2 ' of offside;
(6), can obtain two phase difference of voltage Δ θ according to voltage phasor V1 and V2 ';
(7) according to the Changing Pattern of differential seat angle Δ θ between the voltage phasor of both sides, application is based on the step-out off-the-line criterion of impedance-compensated principle, can judge whether system asynchronous oscillation takes place and whether the asynchronous oscillation center is dropped on this circuit, and the execution of correspondingly open or locking step-out off-the-line control action.
Among the present invention, disclosed a kind of improvement of electric power system step-out off-the-line criterion method for designing.This method is based on the wide area real-time measurement system, utilize communication system just often to calculate the line impedance value in real time, according to this actual track resistance value, employing is declared based on the step-out off-the-line of impedance-compensated principle and is crouched, automatically identify whether the electric power system of interconnection both sides is in the asynchronous oscillation state, whether the asynchronous oscillation center is on this circuit, and the execution of correspondingly open or locking step-out off-the-line control action.Compare with relying on the method that obtains the compensating impedance value of adjusting in advance, this method has solved and can not adapt to the key difficult problem that the operation of power networks state changes automatically, has also solved the problem of overcompensation simultaneously, and actuating range is very clear and definite.The flow process of this method is referring to Fig. 1.The voltage phasor V that relates in this method, the calculating of electric current phasor I, the step-out off-the-line criterion that reaches based on compensating impedance principle all is ripe algorithms, not in this description.
3, beneficial effect
Based on applying of the method applied in the present invention, will realize the control of the tangible electric power system step-out of safe and reliable, actuating range off-the-line, stabilization of power grids destruction and the large area blackout of avoiding accident to cause.
(1) adopts the application compensating impedance principle of measuring in real time based on wide area to judge the electric power system step-out off-the-line control device of step-out off-the-line method design, can effectively solve the coarse problem of conventional step-out disconnection device determination range
(2) adopted the application compensating impedance principle of measuring in real time based on wide area to judge the electric power system step-out off-the-line control device of step-out off-the-line method design, can effectively solve since rely on fully that the wide area real-time measurement system carries out that the step-out judgement causes communication reliability is required very high problem;
(3) adopted the application compensating impedance principle of measuring in real time based on wide area to judge the electric power system step-out off-the-line control device of step-out off-the-line method design, can effectively solve conventional compensating impedance principle and judge that step-out off-the-line method changes the problem of bad adaptability to electric network composition;
(4) adopted the application compensating impedance principle of measuring in real time based on wide area to judge the electric power system step-out off-the-line control device of step-out off-the-line method design, can effectively solve many cover step-out disconnection devices and constitute the problem that is difficult to mutual cooperation after the step-out off-the-line system;
Adopted the application compensating impedance principle of measuring in real time based on wide area to judge the electric power system step-out off-the-line control device of step-out off-the-line method design, need to introduce the wide area real-time measuring data, but the technology comparative maturity that increases does not influence traditional reliability based on decision logic in the step-out off-the-line control method of compensating impedance principle.
Description of drawings
Fig. 1 is the inventive method flow chart.
Embodiment
Be a preferred embodiment of the present invention below, comprised the criterion explanation of the electric power system step-out disconnection device that adopts method realization of the present invention.Other features, objects and advantages of the present invention also can be found out from the explanation of embodiment and accompanying drawing 2.
As shown in Figure 2, have the high-speed communication passage between step-out disconnection device A and the step-out disconnection device B, the clock of device A is by the clock synchronization of high-speed communication passage with device B.
(1) busbar voltage phasor U is calculated in device A sampling
AWith line current phasor I
A, and mark phasor U
A, I
AMarkers; Busbar voltage phasor U is calculated in device B sampling
BWith line current phasor I
B, and mark phasor U
B, I
BMarkers.
Target phasor U when (2) device A obtains to be with by the high-speed communication passage continuously
B, I
B
(3) device A is according to the phasor U under the same markers
A, I
AWith phasor U
B, I
B, according to phasor calculation formula Z=2 (U
A-U
B)/(I
A+ I
B), obtain line impedance Z
LAnd preserve.
(4) device A is according to the phasor U that samples and calculate on the spot
A, I
AAnd the line impedance Z that calculates
L, according to phasor calculation formula U '=U
A-I
A* Z
L, obtain circuit offside B point voltage phasor U '
B
(5) device A can obtain voltage phasor U in view of the above
AAnd U '
BBetween differential seat angle Δ θ '.
(6) device A is according to the Changing Pattern of Δ θ ', can judge whether system oscillation center has taken place dropped on asynchronous oscillation on this circuit.
From as can be seen above, only on traditional step-out disconnection device, introduced the notion of wide area measurement, with regard to complete solution because the employing people is the problems such as the step-out off-the-line actuating range that brings is inaccurate, criterion adaptive system changing capability is not strong of adjusting.
The present invention is illustrated according to the preferred embodiment, should be appreciated that but the foregoing description does not limit the present invention in any form, and all employings are equal to replaces or the technical scheme that form obtained of equivalent transformation, all drops within protection scope of the present invention.
Claims (1)
1, a kind of method for designing based on application compensating impedance principle judgement step-out off-the-line is characterized in that, may further comprise the steps:
(1) is installed in the step-out disconnection device that the circuit both sides have synchronised clock, uses wherein measurement module to measure the circuit both sides in real time and unify busbar voltage phasor V1, V2 and line current phasor I1, I2 under the markers
(2) by the high-speed communication module of step-out disconnection device itself and the high-speed communication network of electric power system, target voltage phasor and electric current phasor when the both sides device exchanges the band that collects;
(3) real-time computational scheme equivalent impedance Z=2 (V1-V2)/(I1+I2) according to the Z that calculates, preserves the compensating impedance Z as circuit
L
(4), just refresh this compensating impedance value if communication is normal always; If communication abnormality, the last resistance value of the preservation just often of then will communicating by letter is as this line build-out resistance value;
(5) according to the line build-out resistance value Z that obtains
L, a side voltage and current phasor V1, I1, can calculate the voltage phasor V2 ' of offside;
(6), can obtain two phase difference of voltage Δ θ according to voltage phasor V1 and V2 ';
(7) according to the Changing Pattern of differential seat angle Δ θ between the voltage phasor of both sides, application is based on the step-out off-the-line criterion of impedance-compensated principle, can judge whether system asynchronous oscillation takes place and whether the asynchronous oscillation center is dropped on this circuit, and the execution of correspondingly open or locking step-out off-the-line control action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100219329A CN101345410B (en) | 2008-08-19 | 2008-08-19 | Design method for judging out-of-step separation based on application compensating impedance principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100219329A CN101345410B (en) | 2008-08-19 | 2008-08-19 | Design method for judging out-of-step separation based on application compensating impedance principle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101345410A true CN101345410A (en) | 2009-01-14 |
| CN101345410B CN101345410B (en) | 2011-04-06 |
Family
ID=40247332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100219329A Active CN101345410B (en) | 2008-08-19 | 2008-08-19 | Design method for judging out-of-step separation based on application compensating impedance principle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101345410B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064524A (en) * | 2010-11-10 | 2011-05-18 | 中电普瑞科技有限公司 | Electrical power system desynchronization and rapid disconnection judging method |
| CN102590673A (en) * | 2012-02-24 | 2012-07-18 | 辽宁省电力有限公司抚顺供电公司 | Parameter tester for transmission line |
| CN102749517A (en) * | 2012-07-11 | 2012-10-24 | 北京四方继保自动化股份有限公司 | Method for monitoring and analyzing oscillation impedance measurement track of electric power system |
| CN103235199A (en) * | 2013-05-15 | 2013-08-07 | 武汉大学 | Out-of-step separation judgment method based on frequency difference of buses at two ends of branch |
| CN103296643A (en) * | 2013-03-19 | 2013-09-11 | 昆明理工大学 | Comparative isolated island detection and protection method based on wide range information phase difference |
| CN102668298B (en) * | 2009-09-30 | 2014-10-15 | 阿尔斯通技术有限公司 | Phase angle drift detection method for loss of mains/grid protection |
| CN105372553A (en) * | 2015-10-11 | 2016-03-02 | 国电南瑞科技股份有限公司 | Electric power system synchronism loss judging and synchronism loss oscillation center positioning methods based on wide area bus information |
| CN106556776A (en) * | 2016-11-10 | 2017-04-05 | 华北电力大学 | A kind of asynchronous oscillation center catching method based on oscillation energy |
| CN111244971A (en) * | 2020-01-13 | 2020-06-05 | 中国南方电网有限责任公司 | Pilot out-of-step disconnection system and method |
| CN111864747A (en) * | 2020-08-13 | 2020-10-30 | 国网黑龙江省电力有限公司电力科学研究院 | Power grid oscillation splitting judgment method taking voltage as criterion |
-
2008
- 2008-08-19 CN CN2008100219329A patent/CN101345410B/en active Active
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102668298B (en) * | 2009-09-30 | 2014-10-15 | 阿尔斯通技术有限公司 | Phase angle drift detection method for loss of mains/grid protection |
| CN102064524A (en) * | 2010-11-10 | 2011-05-18 | 中电普瑞科技有限公司 | Electrical power system desynchronization and rapid disconnection judging method |
| CN102064524B (en) * | 2010-11-10 | 2014-03-12 | 中电普瑞科技有限公司 | Electrical power system desynchronization and rapid disconnection judging method |
| CN102590673A (en) * | 2012-02-24 | 2012-07-18 | 辽宁省电力有限公司抚顺供电公司 | Parameter tester for transmission line |
| CN102749517A (en) * | 2012-07-11 | 2012-10-24 | 北京四方继保自动化股份有限公司 | Method for monitoring and analyzing oscillation impedance measurement track of electric power system |
| CN103296643B (en) * | 2013-03-19 | 2017-02-22 | 昆明理工大学 | Comparative isolated island detection and protection method based on wide range information phase difference |
| CN103296643A (en) * | 2013-03-19 | 2013-09-11 | 昆明理工大学 | Comparative isolated island detection and protection method based on wide range information phase difference |
| CN103235199A (en) * | 2013-05-15 | 2013-08-07 | 武汉大学 | Out-of-step separation judgment method based on frequency difference of buses at two ends of branch |
| CN105372553A (en) * | 2015-10-11 | 2016-03-02 | 国电南瑞科技股份有限公司 | Electric power system synchronism loss judging and synchronism loss oscillation center positioning methods based on wide area bus information |
| CN105372553B (en) * | 2015-10-11 | 2018-09-14 | 国电南瑞科技股份有限公司 | A kind of judgement of electric system step-out and asynchronous oscillation center positioning method based on wide area busbar information |
| CN106556776A (en) * | 2016-11-10 | 2017-04-05 | 华北电力大学 | A kind of asynchronous oscillation center catching method based on oscillation energy |
| CN111244971A (en) * | 2020-01-13 | 2020-06-05 | 中国南方电网有限责任公司 | Pilot out-of-step disconnection system and method |
| CN111244971B (en) * | 2020-01-13 | 2023-05-02 | 中国南方电网有限责任公司 | Longitudinal out-of-step splitting system and method |
| CN111864747A (en) * | 2020-08-13 | 2020-10-30 | 国网黑龙江省电力有限公司电力科学研究院 | Power grid oscillation splitting judgment method taking voltage as criterion |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101345410B (en) | 2011-04-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101345410B (en) | Design method for judging out-of-step separation based on application compensating impedance principle | |
| RU2525841C2 (en) | Protection of parallel lines of power supply grid | |
| US9568516B2 (en) | Determining status of electric power transmission lines in an electric power transmission system | |
| CN101860000B (en) | Quick identification method for permanent fault before single-phase reclosing of power transmission line | |
| CN104466945A (en) | Method for analyzing loop closing risks based on interconnection switch in power distribution network | |
| CN111327029B (en) | Substation dynamic small resistor in-situ protection system and method thereof | |
| CN104362599A (en) | Method for protecting low-voltage bus of intelligent substation | |
| CN104316836B (en) | Online grid fault detection method based on relative protection entropy and nominal transition resistance | |
| CN101521407B (en) | Three-segment out-of-step self-adaptive disconnecting method | |
| CN102231515B (en) | Control protection method, device and system for series capacitor device | |
| EP3757581B1 (en) | Intelligent electronic device operation during power swing | |
| US20220131366A1 (en) | Primary and system protection for an electric power delivery system | |
| CN103490404A (en) | Tuning method of following-setting-type arc suppression coil of power distribution network system and fault line selection method | |
| CN105510754A (en) | Dual AD sampling inconsistency judging method for intelligent substation | |
| CN107064714B (en) | MMC-HVDC electric transmission line fault detection method based on unilateral transient current | |
| CN104515934A (en) | HHT (Hilbert-Huang transform)-based microcomputer small-current earth-fault line selection device | |
| CN106501572A (en) | High voltage DC breaker shnt capacitor out-of-balance current monitoring device and method | |
| CN105548943A (en) | CVT capacitor online monitoring method based on CVT secondary voltage monitoring | |
| CN105137285A (en) | Power distribution network grounding fault line selection method and system | |
| CN104319905A (en) | Quick self-healing system of power distribution network | |
| CN109031033B (en) | Fault branch identification method and system based on T node current | |
| CN106154115A (en) | Distributed feed line automatization terminal and distribution line failure judgement system, method | |
| Yin et al. | The research and the development of the wide area relaying protection based on fault element identification | |
| CN107561404B (en) | Voltage line selection method of resonant grounding system | |
| Tutvedt et al. | Smart fault handling in medium voltage distribution grids |
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 | ||
| ASS | Succession or assignment of patent right |
Free format text: FORMER OWNER: NANJING NARI CO., LTD. Effective date: 20130220 Owner name: NANJING NARI CO., LTD. Free format text: FORMER OWNER: STATE GRID ELECTRIC POWER RESEARCH INSITITUTE Effective date: 20130220 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130220 Address after: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Patentee after: Nanjing Nari Co., Ltd. Address before: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Patentee before: State Grid Electric Power Research Insititute Patentee before: Nanjing Nari Co., Ltd. |
|
| ASS | Succession or assignment of patent right |
Owner name: NARI TECHNOLOGY DEVELOPMENT CO., LTD. Free format text: FORMER OWNER: NANJING NARI CO., LTD. Effective date: 20140103 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 210003 NANJING, JIANGSU PROVINCE TO: 210061 NANJING, JIANGSU PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20140103 Address after: 210061 D10, Nanjing high tech Industrial Development Zone, Jiangsu, China Patentee after: NARI Technology Development Co., Ltd. Address before: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Patentee before: Nanjing Nari Co., Ltd. |