CN106684841B - Flexible direct current network system direct-current short circuit fault protecting method and device - Google Patents
Flexible direct current network system direct-current short circuit fault protecting method and device Download PDFInfo
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- CN106684841B CN106684841B CN201710063382.6A CN201710063382A CN106684841B CN 106684841 B CN106684841 B CN 106684841B CN 201710063382 A CN201710063382 A CN 201710063382A CN 106684841 B CN106684841 B CN 106684841B
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- 238000001514 detection method Methods 0.000 description 17
- 230000005540 biological transmission Effects 0.000 description 8
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- 238000010586 diagram Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
Abstract
The present invention relates to a kind of flexible direct current network system direct-current short circuit fault protecting method and devices; part between DC line side inverter and proximal end feed(er) reactor is divided into the first, second protection zone; wherein; region is the first protection zone between the reactor and dc circuit breaker of proximal end route; it is the second protection zone between dc circuit breaker and inverter, and the short trouble in the first, second protection zone is protected accordingly.This method can effectively identify the short trouble protection of the first, second protection zone; when short trouble occurs for any protection zone; the normal operation that all will not influence another protection zone ensure that the problem of fault-free route is not cut by mistake, realize that short trouble is accurately and quickly isolated on DC line.
Description
Technical field
The invention belongs to flexible HVDC transmission system technical field of relay protection, and in particular to flexible direct current network system is straight
Flow short-circuit fault protecting method and device.
Background technique
Currently, the high pressure flexible direct current transmission of electricity using modularization multi-level converter (MMC) is to solve extensive new energy
Concentrate the important channel sent outside.By taking the Zhangbei County in China area as an example, the wind-powered electricity generation of Zhangbei County and Kangbao County area is passed through into flexible direct current
The Fengning sent outside to Beijing and Ji Bei is concentrated in transmission of electricity, needs to build four end flexible DC transmission nets.Using flexible direct current power grid into
When row long distance power transmission, it is contemplated that economy should not use direct current cables between converter station, and should use direct current overhead transmission line,
But the application of direct current overhead transmission line increases the probability that short trouble occurs for DC side.
Existing flexible DC transmission route protection is mainly for both-end or multi-terminal system, and there is presently no feasible differences
Method, by the short trouble protection on DC line between breaker and reactor and the short circuit between breaker and inverter
Error protection is distinguished, in the prior art, when on the route between inverter and reactor (including breaker and reactor it
Between route between breaker and inverter) any one place when short trouble occurs, can all start corresponding protection act,
For example, existing protection not only disconnects on above-mentioned DC line when short trouble occurs for b point on DC line as shown in Figure 2
Breaker 1. such as breaker also will disconnect the breaker on the All other routes being connected with inverter MMC, 2. such as breaker, and
Breaker where actually need to only disconnecting b point when short trouble occurs for b point on DC line is that is, straight where isolation b point
Flow Line, All other routes can continue to operate normally.
Summary of the invention
The object of the present invention is to provide a kind of flexible direct current network system direct-current short circuit fault protecting method and devices, are used for
Solve the problems, such as the short trouble protection cutting fault-free route in the prior art between inverter and reactor.
In order to solve the above technical problems, the present invention proposes a kind of flexible direct current network system direct-current short circuit error protection side
Part between one side inverter and proximal end feed(er) reactor is divided into the first, second two for a DC line by method
Protection zone, the first protection zone include the region between the reactor and dc circuit breaker of proximal end route, the second protection zone
Including the region between dc circuit breaker and inverter；
First protection zone is held using dc circuit breaker electric current and proximal end route reactor current as differential input
Row differential protection, if short trouble occurs in the first protection zone, at least sending corresponding line proximal end dc circuit breaker tripping
Instruction；
For the second protection zone, all routes being connected with change of current valve outlet DC bus current, with inverter it is close
End dc circuit breaker electric current is differential input, executes differential protection, if the second protection zone internal fault, at least sending and the change of current
The trip command of the connected all route proximal ends breaker of device.
Further, first protection zone, the second protection zone differential protection be with difference current change rate be sentence
According to differential protection.
Further, it is also corresponding on the DC line when short trouble occurring in first, second protection zone
Distal end dc circuit breaker issues trip command.
It further, further include between proximal end feed(er) reactor and distal line reactor for a DC line
Third protection zone traveling-wave protection and the protection of voltage jump amount are performed simultaneously for third protection zone, if generation region in
Short trouble then issues corresponding line both ends dc circuit breaker trip command.
In order to solve the above technical problems, the present invention proposes a kind of flexible direct current network system direct-current short circuit error protection dress
It sets, including with lower unit:
For to a DC line, the part between one side inverter and proximal end feed(er) reactor is divided into first,
The second two protection zones, the first protection zone include the region between the reactor and dc circuit breaker of proximal end route, and second
Protection zone includes the unit in the region between dc circuit breaker and inverter；
For to the first protection zone, using dc circuit breaker electric current and proximal end route reactor current as differential input,
Differential protection is executed, if short trouble occurs in the first protection zone, at least sending corresponding line proximal end dc circuit breaker is jumped
The unit of lock instruction；
For to the second protection zone, all routes being connected with change of current valve outlet DC bus current, with inverter
Proximal end dc circuit breaker electric current is differential input, differential protection is executed, if the second protection zone internal fault, at least issues and change
Flow the unit of the trip command of the connected all route proximal ends breaker of device.
Further, first protection zone, the second protection zone differential protection be with difference current change rate be sentence
According to differential protection.
It further, further include for the DC line when short trouble occurring in first, second protection zone
Upper corresponding distal end dc circuit breaker issues the unit of trip command.
It further, further include for nearly end line reactor and distal line reactor to a DC line
Between position be defined as third protection zone, for third protection zone, be performed simultaneously traveling-wave protection and voltage jump amount protected
Shield issues the unit of corresponding line both ends dc circuit breaker trip command if short trouble occurs in region.
The beneficial effects of the present invention are: the part between DC line side inverter and proximal end feed(er) reactor is divided into
First, second protection zone, wherein region is the first protection zone between the reactor and dc circuit breaker of proximal end route, directly
Flowing is the second protection zone between breaker and inverter, and is carried out to the short trouble in the first, second protection zone corresponding
Protection.This method can effectively identify that the short trouble of (the first protection zone) between breaker and reactor on DC line is protected
The short trouble protection of (the second protection zone) between shield and breaker and inverter, when short circuit occurs for any protection zone
Failure all will not influence the normal operation of another protection zone, ensure that the problem of fault-free route is not cut by mistake, realize direct current
Short trouble is accurately and quickly isolated on route.
Detailed description of the invention
Fig. 1 is flexible direct current network system direct-current short circuit error protection allocation plan schematic diagram of the present invention；
Fig. 2 is Converter DC-side short trouble subregion schematic diagram；
Fig. 3 is the short trouble isolation schematic diagram of the first protection zone；
Fig. 4 is the short trouble isolation schematic diagram of the second protection zone；
Fig. 5 is the short trouble isolation schematic diagram of third protection zone；
Fig. 6 is protection act logical schematic.
Specific embodiment
A specific embodiment of the invention is further described with reference to the accompanying drawing.
A kind of embodiment of flexible direct current network system direct-current short circuit fault protecting method of the present invention:
For a DC line, the part between one side inverter and proximal end feed(er) reactor is divided into first,
2 two protection zones, the first protection zone include the region between the reactor and dc circuit breaker of proximal end route, and second protects
Shield region includes the region between dc circuit breaker and inverter；Nearly between end line reactor and distal line reactor
Position is defined as third protection zone.
First protection zone is held using dc circuit breaker electric current and proximal end route reactor current as differential input
Row differential protection, if short trouble occurs in the first protection zone, at least sending corresponding line proximal end dc circuit breaker tripping
Instruction.For the second protection zone, the proximal end for all routes being connected with change of current valve outlet DC bus current, with inverter is straight
Stream circuit breaker current is differential input, executes differential protection, if the second protection zone internal fault, is at least issued and inverter phase
The trip command of all route proximal ends breaker even.For third protection zone, executes traveling-wave protection and voltage jump amount is protected
Shield issues corresponding line both ends dc circuit breaker trip command if short trouble occurs in region.
Specifically, inverter as shown in Figure 2, using MMC topological structure, with dc circuit breaker 1. where the first direct current
For route, 1. the reactor of the proximal wire road of the first DC line and dc circuit breaker are set as the first protection zone, it will
Region of the dc circuit breaker 1. between inverter MMC is set as the second protection zone, by the proximal wire road of the first DC line
Reactor and distal line on reactor between be set as third protection zone.Acquire the first protection zone two sides inlet-outlet line
Electric current i2、i3, execute differential protection: working as i2、i3The absolute value of difference current change rate when being more than the first setting valve, determine the
Short trouble (such as short circuit occurs for b point) occurs for one protection zone, determines that formula is as follows:
In formula, dibsetThe first AC line is triggered after identifying that short trouble occurs for the first protection zone for the first setting valve
Dc circuit breaker of the dc circuit breaker of road proximal wire road 1. and on distal line, as shown in figure 3, realizing short circuit event
Barrier quickly isolates.
Acquire the electric current i of the first protection zone two sides inlet-outlet line2、i3While, also need the change of current in the second protection zone of acquisition
Device MMC outgoing line side electric current i1, and on another route for being connected with inverter MMC dc circuit breaker 2. end of incoming cables electric current i4, hold
Row differential protection: work as i1、i2、i4Difference current change rate absolute value be more than the second setting valve when, determine the second protection zone
Short trouble (such as short circuit occurs for a point) occurs, determines that formula is as follows:
In formula, diasetThe first AC line is triggered after identifying that short trouble occurs for the second protection zone for the second setting valve
The dc circuit breaker of road proximal wire road 1., the dc circuit breaker of another route proximal wire road 2. and the first DC line
With the dc circuit breaker on the distal line of another route, the short trouble is quickly isolated as shown in figure 4, realizing.
For the third protection zone on the first DC line between proximal end feed(er) reactor and distal line reactor, hold
Row traveling-wave protection and the protection of voltage jump amount issue corresponding line two if short trouble (such as the short circuit of c point) occurs in region
Dc circuit breaker trip command is held, as shown in Figure 5.Wherein, Protection Principle of Travelling Wave are as follows:
In formula, PdifFor direct current side pole mould wave；GcomFor DC side mould wave；ZdifFor direct current side pole mould wave impedance；ZcomFor
DC side ground mould wave impedance；Idif、UdifFor system differential-mode component；Icom、UcomFor system common-mode component；△ 1 is pole wave change rate
Setting valve；△ 2 is pole wave setting valve；△ 3 is ground mould wave setting valve.
Voltage jump amount protection philosophy are as follows:
In formula, dusetFor voltage change ratio setting valve；UsetFor DC voltage setting valve；disetFor DC current change rate
Setting valve.
The quick trigger method of dc circuit breaker of the present invention is as follows: when the second protection zone failure, needing to simultaneously switch off
The dc circuit breaker at all DC line both ends being connected with failure converter station can realize that the accurate of faulty line is isolated, such as
Shown in Fig. 4；When the region on the first protection zone, DC line between proximal end feed(er) reactor and distal line reactor occurs
When failure, it is only necessary to the dc circuit breaker at DC line both ends where disconnecting fault point, it can accurate isolated fault route, such as figure
Shown in 3；When the first protection zone, the second protection zone failure, distal end converter station be will test less than failure, but must be triggered
Dc circuit breaker disconnects, therefore must just receive the detection of near terminal fault and positioning result and trigger breaker actuation.
It follows that the movement of cut-offfing of dc circuit breaker is controlled by four instructions, proximal end route failure detection result, proximal end
Failure detection result, proximal end dc circuit breaker valve side short trouble testing result between dc circuit breaker and line reactance, and
Distal end dc circuit breaker action command.
(1) proximal end route failure detection result: when proximal end, DC line fault detection device detects third protection zone
When interior generation short trouble, indicates the failure and trigger the disconnection of proximal end dc circuit breaker, while far-end fault detection device detects
To line fault and the disconnection of distal end dc circuit breaker is triggered, realizes the isolation of faulty line.
(2) failure detection result between proximal end dc circuit breaker and line reactance: when detection device detects the first protection
It when short trouble occurring in region, indicates that the position is broken down, and triggers the disconnection of proximal end dc circuit breaker, but distal end event at this time
Barrier detection device can not detect the failure, can not trigger the disconnection of distal end dc circuit breaker, it is therefore desirable to by proximal end fault detection
As a result it is transmitted to distal end to disconnect to trigger distal end dc circuit breaker, realizes the isolation of faulty line.
(3) proximal end dc circuit breaker valve side short trouble testing result: when detection device detects in the second protection zone
When short trouble occurs, indicate that the region is broken down, and it is straight to trigger all DC line proximal ends being connected with failure converter station
It flows breaker to disconnect, but other far-end fault detection devices can not detect the failure at this time, can not trigger distal end direct current interruption
Device disconnects, it is therefore desirable to proximal end failure detection result are transmitted to distal end and disconnected to trigger distal end dc circuit breaker, realize failure
The isolation of route.
(4) distal end dc circuit breaker action command: it is similar with above-mentioned (2), the analysis of (3), when distal end dc circuit breaker with
When route or distal end DC bus break down between line reactance, proximal end protective device can't detect failure, need distal end
Dc circuit breaker action command be transmitted to proximal end, triggering proximal end breaker disconnects the isolation for realizing faulty line.
Above-mentioned four kinds of situations should all trigger dc circuit breaker movement and cut-off, therefore dc circuit breaker cut-offs instruction and is total to by four
With issuing, when at least one testing result is effective, dc circuit breaker, which acts, to be cut-off, as shown in Figure 6.
The present invention is based on Protection Principle of Travelling Wave and Sudden Changing Rate protection philosophy, by current changing rate, voltage change ratio and
Variable quantity and difference current change rate, and according to the difference of abort situation, failure is divided into trizonal failure: direct current
The failure of failure and proximal end dc circuit breaker valve side between reactive circuitry side failure, dc circuit breaker and direct current reactor.
When direct current reactor line side failure (referring to the failure occurred between two direct current reactors on DC line),
Traveling-wave protection that route both ends are configured, voltage jump amount Preservation tactics are able to detect that failure, and trigger breaker actuation.
When Partial DC line failure between dc circuit breaker and direct current reactor, the configured Preservation tactics in distal end
It can not detect failure, and proximally by the differential of two measuring points in detection direct current reactance line side, dc circuit breaker line side
Current changing rate realizes fault detection and location, and then triggers dc circuit breaker movement, and breaker actuation signal is transmitted to
Distal end dc circuit breaker.
When proximal end dc circuit breaker valve side failure (failure for referring to DC line between dc circuit breaker and inverter), far
Failure can not equally be detected by holding configured Preservation tactics, and proximally by detecting change of current valve outlet DC bus current, and be changed
The change rate for flowing the proximal end dc circuit breaker electric current of the connected all routes of device realizes fault detection and location, and then triggers direct current
Breaker actuation, and breaker actuation signal is transmitted to distal end dc circuit breaker.
In conclusion short trouble guard method proposed by the present invention is directed to flexible direct current network system, in DC line
Any place occur short trouble when, can realize failure it is quick detection with position.
Claims (8)
1. a kind of flexible direct current network system direct-current short circuit fault protecting method, which is characterized in that, will for a DC line
Part between one side inverter and proximal end feed(er) reactor is divided into the first, second two protection zones, the first protection zone
Region between reactor and dc circuit breaker including proximal end route, the second protection zone include dc circuit breaker and inverter
Between region；
Difference is executed using dc circuit breaker electric current and proximal end route reactor current as differential input for the first protection zone
Dynamic protection at least issues corresponding line proximal end dc circuit breaker trip command if short trouble occurs in the first protection zone；
For the second protection zone, the proximal end for all routes being connected with change of current valve outlet DC bus current, with inverter is straight
Stream circuit breaker current is differential input, executes differential protection, if the second protection zone internal fault, is at least issued and inverter phase
The trip command of all route proximal ends breaker even.
2. flexible direct current network system direct-current short circuit fault protecting method according to claim 1, which is characterized in that described
First protection zone, the second protection zone differential protection be using difference current change rate as the differential protection of criterion.
3. flexible direct current network system direct-current short circuit fault protecting method according to claim 1, which is characterized in that described
When short trouble occurring in the first, second protection zone, corresponding distal end dc circuit breaker is issued also on the DC line
Trip command.
4. flexible direct current network system direct-current short circuit fault protecting method according to claim 1, which is characterized in that for
One DC line further includes the third protection zone between proximal end feed(er) reactor and distal line reactor, for
Third protection zone is performed simultaneously traveling-wave protection and the protection of voltage jump amount if short trouble occurs in region and issues correspondence
Route both ends dc circuit breaker trip command.
5. a kind of flexible direct current network system direct-current short circuit failure protecting device, which is characterized in that including with lower unit:
For to a DC line, the part between one side inverter and proximal end feed(er) reactor to be divided into first, second
Two protection zones, the first protection zone include the region between the reactor and dc circuit breaker of proximal end route, the second protection
Region includes the unit in the region between dc circuit breaker and inverter；
For being executed to the first protection zone using dc circuit breaker electric current and proximal end route reactor current as differential input
Differential protection, if short trouble occurs in the first protection zone, at least the tripping of sending corresponding line proximal end dc circuit breaker refers to
The unit of order；
For to the second protection zone, the proximal end for all routes being connected with change of current valve outlet DC bus current, with inverter
Dc circuit breaker electric current be differential input, execute differential protection, if the second protection zone internal fault, at least issue and inverter
The unit of the trip command of connected all route proximal ends breaker.
6. flexible direct current network system direct-current short circuit failure protecting device according to claim 5, which is characterized in that described
First protection zone, the second protection zone differential protection be using difference current change rate as the differential protection of criterion.
7. flexible direct current network system direct-current short circuit failure protecting device according to claim 5, which is characterized in that described
It further include disconnected for distal end corresponding on the DC line direct current when short trouble occurring in the first, second protection zone
The unit of road device sending trip command.
8. flexible direct current network system direct-current short circuit failure protecting device according to claim 5, which is characterized in that institute
A DC line is stated, further includes being defined as third for the position nearly between end line reactor and distal line reactor
Protection zone is performed simultaneously traveling-wave protection and the protection of voltage jump amount for third protection zone, if short circuit event occurs in region
Barrier, then issue the unit of corresponding line both ends dc circuit breaker trip command.
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| CN201710063382.6A CN106684841B (en) | 2017-02-03 | 2017-02-03 | Flexible direct current network system direct-current short circuit fault protecting method and device |
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| CN201710063382.6A CN106684841B (en) | 2017-02-03 | 2017-02-03 | Flexible direct current network system direct-current short circuit fault protecting method and device |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565521B (en) * | 2017-09-22 | 2019-05-10 | 南方电网科学研究院有限责任公司 | A method of removing flexible direct current power grid dc-side short-circuit fault |
| CN108376976A (en) * | 2018-03-23 | 2018-08-07 | 南方电网科学研究院有限责任公司 | The direct current protecting definite value of multi-terminal direct current transmission system switching method and device in short-term |
| CN110907746B (en) * | 2018-09-18 | 2022-08-30 | 深圳供电局有限公司 | High-voltage alternating-current line open-circuit fault identification method, device, equipment and storage medium |
| CN109103858B (en) * | 2018-10-18 | 2020-02-07 | 南京南瑞继保电气有限公司 | Parallel multi-terminal topology direct-current branch line protection method |
| CN112952890B (en) * | 2021-03-15 | 2023-02-28 | 南方电网科学研究院有限责任公司 | Short-circuit protection method and device for bridge arm reactor of flexible direct-current power transmission system |
| CN114280421A (en) * | 2021-12-28 | 2022-04-05 | 国网北京市电力公司 | Method, system and device for fault selective protection of direct current power distribution network and storage medium |
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