CN106324427A - Fault identification method for multi-terminal DC transmission system - Google Patents
Fault identification method for multi-terminal DC transmission system Download PDFInfo
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- CN106324427A CN106324427A CN201510342884.3A CN201510342884A CN106324427A CN 106324427 A CN106324427 A CN 106324427A CN 201510342884 A CN201510342884 A CN 201510342884A CN 106324427 A CN106324427 A CN 106324427A
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Abstract
The invention discloses a fault identification method for a multi-terminal DC transmission system. The fault identification method comprises the steps of: 1) dividing a multi-terminal DC line into a plurality of unit lines; 2) arranging a measurement protection device used for fault identification at each end of each unit line, acquiring DC currents and voltages simultaneously by means of the measurement protection devices, and judging fault directions by utilizing variations of the DC currents and voltages; 3) isolating a current converter if the measurement protection device at one end of one unit line judges that the fault direction is a current converter side, or, isolating the line if an internal fault occurs when the measurement protection device judges that the fault direction is a DC line side while the measurement protection devices at other ends of the unit line judges that the fault direction is a same-direction DC line side, and not isolating the line if an external fault occurs when the fault direction judged by the measurement protection devices at other ends of the unit line where the end locates is an opposite-direction DC line side. The fault identification method greatly improves the reliability and accelerates the speed of fault identification, adapts to the latest demand of a primary system, and has high engineering practical value.
Description
Technical field
The present invention relates to multi-terminal HVDC transmission field, particularly relate to a kind of Multi-end flexible direct current transmission
Line fault recognition methods.
Background technology
The energy source distribution of China and electric network composition determine D.C. high voltage transmission and have wide application
Prospect.Traditional two ends direct current is only capable of realizing point-to-point dc power transmission, when multiple exchanges
When using direct current interconnection between system, needing a plurality of DC power transmission line, this will be greatly improved investment
Cost and operating cost, therefore multi-terminal direct current transmission system with its economy, flexibly, reliable etc.
Feature is of increased attention.Switching device technology is entirely controlled along with high-power electric and electronic
And the maturation of Technology of HVDC based Voltage Source Converter and development, Multi-end flexible direct current transmission is mutual at many electrical networks
Development potentiality in the fields such as company, distributed power generation, city power distribution manifests day by day.For multiterminal
For system, location and isolated fault circuit in time, for the direct current of two ends, meaning is heavier
Greatly.Simultaneously because the own feature of wholly-controled device used in Multi-end flexible direct current transmission system,
Resistance to relatively low, to fault location and isolation rate request ratio in customary DC by stream and overvoltage capabilities
Height at least an order of magnitude wanted by half control type device.
The patent of Application No. 201110350643.5 provides a kind of multi-terminal direct current transmission system
Pilot protection method for direct current line current abrupt change, centralised arrangement make use of each station electric current
In variable quantity information distinguishes district and external area error, it is judged that fault widow time is that 3ms arrives
Between 30ms.
The patent of Application No. 201210537259.0 provides a kind of Modular multi-level multi-terminal
Flexible direct current system direct current fault handling method, proposes to use electric current anti-when bipolar earth fault
Always judge, use when monopolar grounding fault electric current to reduce with voltage in the same direction and judge.
Flexible straight at the multiterminal of many level block inverter pattern of employing wholly-controled device at present
In the case of stream power transmission engineering, it is low all to there is sensitivity in prior art, the problem that speed of action is slow.
Summary of the invention
It is an object of the invention to provide a kind of highly sensitive, be swift in motion reliable multiterminal element
Fault recognition method for electric transmission line.
In order to reach above-mentioned purpose, the technical solution used in the present invention is: a kind of multiterminal are flexible straight
Stream fault recognition method for electric transmission line, it is characterised in that comprise the steps:
1) multiterminal element circuit being separated into multiple unit line, the unit line after separation is two
End system, or be multi-terminal system；
2) each end at each unit line is all configured to the measurement protection device of Fault Identification,
Each protection device of measuring gathers DC current and voltage simultaneously, and utilizes DC current and voltage to become
Change failure judgement direction；
3) if the measurement protection device failure judgement direction of certain one end of a certain unit line is the change of current
Device side, then isolate inverter；If failure judgement direction is AC line trackside, and its place unit
In the fault direction that judges of other end be AC line trackside in the same direction, then be troubles inside the sample space, isolate this
Unit line；If the fault direction that other end in certain place, one end unit described judges is reverse
AC line trackside, then be external area error, do not isolate this unit line.
Further, described step 1) according to actual needs multiterminal element circuit is divided into many
Individual unit line.
Further, it is actually needed and includes primary connection and/or protection domain.
Further, described step 2) in by judging rate of change and the DC voltage of DC current
Variable quantity failure judgement direction.
Compared with prior art, the present invention has the beneficial effect that:
Propose brand-new by multiterminal element circuit as required flexibly lattice become arbitrarily relatively
The method of separate unit, independent judgment and identification, extension is convenient, it is not necessary to change original structure.
Use above-mentioned employing DC current simultaneously and DC voltage change as the side of Protection criteria
After case, reliability and the speed of Fault Identification are greatly enhanced, and have adapted to the up-to-date need of primary system
Ask, there is stronger engineering practical value.
Accompanying drawing explanation
Fig. 1 is five end flexible direct current circuit connection diagrams；
Fig. 2 is fault direction decision logic figure
Detailed description of the invention
The present invention is described in more detail with specific embodiment below in conjunction with the accompanying drawings.
A kind of Multi-end flexible direct current transmission line fault recognition methods, comprises the steps:
1) multiterminal element circuit being separated into multiple unit line, the unit line after separation is two
End system, or be multi-terminal system；
2) each end at each unit line is all configured to the measurement protection device of Fault Identification,
Each protection device of measuring gathers DC current and voltage simultaneously, and utilizes DC current and voltage to become
Change failure judgement direction；
3) if the measurement protection device failure judgement direction of certain one end of a certain unit line is the change of current
Device side, then isolate inverter；If failure judgement direction is AC line trackside, and its place unit
In the fault direction that judges of other end be AC line trackside in the same direction, then be troubles inside the sample space, isolate this
Unit line；If the fault direction that other end in certain place, one end unit described judges is reverse
AC line trackside, then be external area error, do not isolate this unit line.
Preferably, described step 1) according to actual needs by multiterminal element circuit separate
For multiple unit lines.It is actually needed and includes primary connection and/or protection domain.Described step
2) the variable quantity failure judgement direction of rate of change and DC voltage by judging DC current in.
In certain five end flexible direct current engineering, primary connection circuit such as Fig. 1, i.e. end 2 pass through respectively
DC line L12 and end 1, by DC line L23 and end 3, by DC line L24
Being connected with end 4, end 4 is connected with end 5 by DC line L45.Q1, Q2, Q3,
Q4, Q5, Q21, Q24, Q23, Q42, Q45 position is configured with corresponding DC current
And voltage measurement.
According to positioning the most accurate principle after fault, this five ends flexible direct current can be separated into five
Line unit, i.e. end 1-end 2 line unit, end 2-end 3 line unit, end 2-end 4 line
Road unit, end 4-end 5 line unit, and bus unit in the station of end 2 and end 4.At this
Separate under situation, if judging at the Q1 of end 1 that fault direction is inverter side in station, then
Isolation end 1 inverter；If judging at the Q1 of end 1 that fault direction is outer DC line of standing
Side, and simultaneously end 2Q21 at judge fault direction be stand outer AC line trackside time, fault is fixed
Position, in end 1 to the line unit of end 2, need to isolate L12 circuit and remove fault.
(assuming that Q42, can also not have at Q45 according to an actual installation dc switch situation
Installing dc switch), or standby location principle this five ends flexible direct current is separated into 3 lines
Road unit, i.e. end 1-end 2 line unit, end 2-end 3 line unit, end 2-end 4-end 5
Bus unit in line unit, and the station of end 2.In the case of this separation, if end 5
Judge at Q5 that fault direction is inverter side in station, then isolation end 5 inverter；If end
At the Q5 of 5 failure judgement direction for stand outer AC line trackside time, in addition it is also necessary to end 4 Q2 with
Judge when fault direction is to stand outer AC line trackside at the Q24 of end 2 the most simultaneously, the most permissible
In fault location is the line unit holding 2-end 4-end 5, need to be by isolation L24 and L45
Circuit removes fault.
In this specific embodiment, as in figure 2 it is shown, failure judgement direction use following logic:
DC current variable quantity is more than in 2ms after 1.0pu/ms, and DC voltage is less than 0.5pu,
And continuing 200us, then failure judgement direction is in station；DC current variable quantity is less than-1.0pu/ms
In rear 2ms, DC voltage is less than 0.5pu, and continues 200us, then failure judgement direction is
Outside standing.In above-mentioned decision logic, DC current positive direction is in slave station outside directed to station.
Claims (4)
1. a Multi-end flexible direct current transmission line fault recognition methods, it is characterised in that include
Following steps:
1) multiterminal element circuit being separated into multiple unit line, the unit line after separation is two
End system, or be multi-terminal system；
2) each end at each unit line is all configured to the measurement protection device of Fault Identification,
Each protection device of measuring gathers DC current and voltage simultaneously, and utilizes DC current and voltage to become
Change failure judgement direction；
3) if the measurement protection device failure judgement direction of certain one end of a certain unit line is the change of current
Device side, then isolate inverter；If failure judgement direction is AC line trackside, and its place unit
In the fault direction that judges of other end be AC line trackside in the same direction, then be troubles inside the sample space, isolate this
Unit line；If the fault direction that other end in certain place, one end unit described judges is reverse
AC line trackside, then be external area error, do not isolate this unit line.
2. a kind of Multi-end flexible direct current transmission line fault identification side as claimed in claim 1
Method, it is characterised in that: described step 1) according to actual needs multiterminal element circuit is divided into
Multiple unit lines.
3. a kind of Multi-end flexible direct current transmission line fault identification side as claimed in claim 2
Method, it is characterised in that: it is actually needed and includes primary connection and/or protection domain.
4. a kind of Multi-end flexible direct current transmission line fault identification side as claimed in claim 1
Method, it is characterised in that: described step 2) in by judging rate of change and the unidirectional current of DC current
The variable quantity failure judgement direction of pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510342884.3A CN106324427A (en) | 2015-06-18 | 2015-06-18 | Fault identification method for multi-terminal DC transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510342884.3A CN106324427A (en) | 2015-06-18 | 2015-06-18 | Fault identification method for multi-terminal DC transmission system |
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| Publication Number | Publication Date |
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| CN106324427A true CN106324427A (en) | 2017-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510342884.3A Withdrawn CN106324427A (en) | 2015-06-18 | 2015-06-18 | Fault identification method for multi-terminal DC transmission system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107919656A (en) * | 2017-12-09 | 2018-04-17 | 天津大学 | HVDC transmission line Non-unit protection method based on specific frequency voltage |
| CN109375054A (en) * | 2018-09-26 | 2019-02-22 | 南方电网科学研究院有限责任公司 | Fault line selection method of direct current transmission system |
| CN114498583A (en) * | 2022-01-20 | 2022-05-13 | 北京交通大学 | Protection and control cooperation-based direct current line impedance phase protection method |
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|---|---|---|---|---|
| CN1870377A (en) * | 2006-06-28 | 2006-11-29 | 南京南瑞继保电气有限公司 | Method for quickly identifying DC pole bus earth fault using voltage as axiliary decision basis |
| CN102255293A (en) * | 2011-07-26 | 2011-11-23 | 西安交通大学 | Single-ended electrical quantity full-line quick-action protection method for recognizing faults inside and outside high-voltage direct-current transmission line region |
| CN102403699A (en) * | 2011-11-08 | 2012-04-04 | 西安交通大学 | Self-adaptive current differential protection method for direct-current lines |
| CN102510050A (en) * | 2011-11-08 | 2012-06-20 | 西安交通大学 | Pilot protection method for direct current line current abrupt change of multi-terminal direct current transmission system |
| CN103066573A (en) * | 2012-12-13 | 2013-04-24 | 国网智能电网研究院 | Modular multi-level multi-terminal flexible direct current system direct current fault handling method |
-
2015
- 2015-06-18 CN CN201510342884.3A patent/CN106324427A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1870377A (en) * | 2006-06-28 | 2006-11-29 | 南京南瑞继保电气有限公司 | Method for quickly identifying DC pole bus earth fault using voltage as axiliary decision basis |
| CN102255293A (en) * | 2011-07-26 | 2011-11-23 | 西安交通大学 | Single-ended electrical quantity full-line quick-action protection method for recognizing faults inside and outside high-voltage direct-current transmission line region |
| CN102403699A (en) * | 2011-11-08 | 2012-04-04 | 西安交通大学 | Self-adaptive current differential protection method for direct-current lines |
| CN102510050A (en) * | 2011-11-08 | 2012-06-20 | 西安交通大学 | Pilot protection method for direct current line current abrupt change of multi-terminal direct current transmission system |
| CN103066573A (en) * | 2012-12-13 | 2013-04-24 | 国网智能电网研究院 | Modular multi-level multi-terminal flexible direct current system direct current fault handling method |
Non-Patent Citations (2)
| Title |
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| LIANXIANG TANG等: "Protection of VSC-multi-terminal HVDC against DC faults", 《IEEE 33RD ANNUAL IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE》 * |
| 施世鸿: "多端直流线路保护研究", 《电力建设》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107919656A (en) * | 2017-12-09 | 2018-04-17 | 天津大学 | HVDC transmission line Non-unit protection method based on specific frequency voltage |
| CN109375054A (en) * | 2018-09-26 | 2019-02-22 | 南方电网科学研究院有限责任公司 | Fault line selection method of direct current transmission system |
| CN114498583A (en) * | 2022-01-20 | 2022-05-13 | 北京交通大学 | Protection and control cooperation-based direct current line impedance phase protection method |
| CN114498583B (en) * | 2022-01-20 | 2023-01-17 | 北京交通大学 | Protection and control cooperation-based direct current line impedance phase protection method |
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