CN106684841A - Flexible direct-current grid system direct-current short-circuit fault protection method and device - Google Patents
Flexible direct-current grid system direct-current short-circuit fault protection method and device Download PDFInfo
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- CN106684841A CN106684841A CN201710063382.6A CN201710063382A CN106684841A CN 106684841 A CN106684841 A CN 106684841A CN 201710063382 A CN201710063382 A CN 201710063382A CN 106684841 A CN106684841 A CN 106684841A
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- Prior art keywords
- protection
- current
- protection zone
- circuit
- circuit breaker
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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 invention relates to the flexible direct-current grid system direct-current short-circuit fault protection method and device, a first and a second protection areas are divided into the parts between a side of the dc circuit changer and a proximal circuit reactor, wherein, the part between the proximal circuit reactor and a dc breaker is the first protection area, the part between the dc breaker and changer is the second protection area, the short trouble of the first and second protection areas are protected correspondingly. The method can efficiently identify the short trouble of the first and second protection areas respectively, when short-circuit fault of one protection area occurs, the normal operating of the other protection area will not be affected, the trouble-free line is not cut wrongly, the short-circuit fault is segregated rapidly and accurately.
Description
Technical field
The invention belongs to flexible direct current power 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 technology
At present, it is to solve extensive new forms of energy using the high pressure flexible direct current transmission of electricity of modularization multi-level converter (MMC)
The important channel that concentration is sent outside.By taking Zhangbei County area of China as an example, the wind-powered electricity generation of Zhangbei County and Kangbao County area is passed through into flexible direct current
The outer Fengning for delivering to Beijing and Ji Bei is concentrated in transmission of electricity, needs to build four end flexible DC power transmission nets.Entered using flexible direct current electrical network
During row long distance power transmission, it is contemplated that economy, direct current cables should not be adopted between current conversion station, and direct current overhead transmission line should be adopted,
But the application of direct current overhead transmission line increases DC side and is short-circuited the probability of failure.
Existing flexible DC power transmission route protection there is presently no feasible difference mainly for both-end or multi-terminal system
Method, by short trouble protection and the short circuit between chopper and inverter on DC line between chopper and reactor
Error protection is distinguished, in prior art, when on the circuit between inverter and reactor (including chopper and reactor it
Between circuit and chopper and inverter between) any one place be short-circuited failure when, can all start corresponding protection act,
For example, on DC line as shown in Figure 2 b points be short-circuited failure when, existing protection is not only disconnected on above-mentioned DC line
Chopper, 1., also such as chopper can disconnect the chopper on the All other routes being connected with inverter MMC, such as chopper 2., and
The chopper on the DC line of b points place actually need to be only disconnected when b points are short-circuited failure, that is, isolates the straight of b points place
Flow Line, All other routes can continue normal operation.
The content of the invention
It is an object of the invention to provide a kind of flexible direct current network system direct-current short circuit fault protecting method and device, are used for
Solve the problems, such as the short trouble protection cut-out fault-free circuit between inverter and reactor in prior art.
To solve above-mentioned technical problem, the present invention proposes a kind of flexible direct current network system direct-current short circuit error protection side
Method, for a DC line, by the part between its side inverter and near-end feed(er) reactor first, second two is divided into
Protection zone, the first protection zone includes the region between the reactor and dc circuit breaker of near-end circuit, the second protection zone
Including the region between dc circuit breaker and inverter；
For the first protection zone, using dc circuit breaker electric current and near-end circuit reactor current as differential input, hold
Row differential protection, if being short-circuited failure in the first protection zone, at least sends the tripping operation of corresponding line near-end dc circuit breaker
Instruction；
For the second protection zone, all circuits being connected with inverter with change of current valve outlet port DC bus current it is near
End dc circuit breaker electric current is differential input, differential protection is performed, if the second protection zone internal fault, at least sends and the change of current
The trip command of the connected all circuit near-end choppers of device.
Further, first protection zone, the differential protection of the second protection zone are with difference current rate of change to sentence
According to differential protection.
Further, during the failure that is short-circuited in first, second protection zone, also to corresponding on the DC line
Distal end dc circuit breaker sends trip command.
Further, for a DC line, also including between near-end feed(er) reactor and distal line reactor
The 3rd protection zone, for the 3rd protection zone, traveling-wave protection and the protection of voltage jump amount are performed, if being short-circuited in region
Failure, then send corresponding line two ends dc circuit breaker trip command.
To solve above-mentioned technical problem, the present invention proposes a kind of flexible direct current network system direct-current short circuit error protection dress
Put, including with lower unit：
For to a DC line, the part between its side inverter and near-end feed(er) reactor is divided into into first,
The second two protection zones, the first protection zone includes the region between the reactor and dc circuit breaker of near-end circuit, 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 near-end circuit reactor current as differential input,
Differential protection is performed, if being short-circuited failure in the first protection zone, the jump of corresponding line near-end dc circuit breaker is at least sent
The unit of lock instruction；
For to the second protection zone, all circuits being connected with inverter with change of current valve outlet port DC bus current
Near-end dc circuit breaker electric current is differential input, differential protection is performed, if the second protection zone internal fault, at least sends and change
The unit of the trip command of the connected all circuit near-end choppers of stream device.
Further, first protection zone, the differential protection of the second protection zone are with difference current rate of change to sentence
According to differential protection.
Further, during the failure that is short-circuited in first, second protection zone, also include for the DC line
Upper corresponding distal end dc circuit breaker sends the unit of trip command.
Further, to a DC line, also include for nearly end line reactor and distal line reactor
Between position be defined as the 3rd protection zone, for the 3rd protection zone, perform traveling-wave protection and the protection of voltage jump amount, if
Be short-circuited failure in region, then send the unit of corresponding line two ends dc circuit breaker trip command.
The invention has the beneficial effects as follows：Part between DC line side inverter and near-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 near-end circuit, directly
It is the second protection zone between stream chopper and inverter, and the short trouble in first, second protection zone is carried out accordingly
Protection.The method can effectively recognize that the short trouble of (the first protection zone) between chopper and reactor on DC line is protected
Shield, and the short trouble of (the second protection zone) is protected between chopper and inverter, when arbitrary protection zone is short-circuited
Failure, all without the normal operation for affecting another protection zone, it is ensured that the problem that fault-free circuit is not cut by mistake, realizes direct current
Short trouble is accurately and quickly isolated on circuit.
Description of the drawings
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 the 3rd protection zone；
Fig. 6 is protection act logical schematic.
Specific embodiment
The specific embodiment of the present invention is further described below in conjunction with the accompanying drawings.
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 its side inverter and near-end feed(er) reactor is divided into into first,
2 two protection zones, the first protection zone includes the region between the reactor and dc circuit breaker of near-end circuit, 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 the 3rd protection zone.
For the first protection zone, using dc circuit breaker electric current and near-end circuit reactor current as differential input, hold
Row differential protection, if being short-circuited failure in the first protection zone, at least sends the tripping operation of corresponding line near-end dc circuit breaker
Instruction.For the second protection zone, the near-end of all circuits being connected with inverter with change of current valve outlet port DC bus current is straight
Stream circuit breaker current is differential input, performs differential protection, if the second protection zone internal fault, is at least sent and inverter phase
The trip command of all circuit near-end choppers even.For the 3rd protection zone, perform traveling-wave protection and voltage jump amount is protected
Shield, if being short-circuited failure in region, sends corresponding line two ends dc circuit breaker trip command.
Specifically, inverter as shown in Figure 2, using MMC topological structure, the first direct current being 1. located with dc circuit breaker
As a example by circuit, 1. the reactor on the near-end circuit of the first DC line and dc circuit breaker are set to into the first protection zone, will
1. dc circuit breaker is set to the second protection zone with the region between inverter MMC, by the near-end circuit of the first DC line
Reactor and distal line on reactor between be set to the 3rd protection zone.Gather the first protection zone both sides line
Electric current i2、i3, perform differential protection：Work as i2、i3Difference current rate of change absolute value more than the first setting valve when, judge the
One protection zone is short-circuited failure (such as b points are short-circuited), judges that formula is as follows：
In formula, dibsetFor the first setting valve, the first protection zone of identification is short-circuited after failure, triggers the first AC line
Dc circuit breaker on the near-end circuit of road 1., and the dc circuit breaker on distal line, as shown in figure 3, realize the short circuit therefore
Barrier is quickly isolated.
Gather the electric current i of the first protection zone both sides line2、i3While, also need to gather the change of current in the second protection zone
Device MMC outgoing line side electric current i1, and on another circuit 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 rate of change absolute value more than the second setting valve when, judge the second protection zone
The failure that is short-circuited (such as a points are short-circuited), judges that formula is as follows：
In formula, diasetFor the second setting valve, the second protection zone of identification is short-circuited after failure, triggers the first AC line
Dc circuit breaker on the near-end circuit of road dc circuit breaker 1., on another circuit near-end circuit 2., and the first DC line
With the dc circuit breaker on the distal line of another circuit, as shown in figure 4, realize quickly isolate the short trouble.
For the 3rd protection zone on the first DC line between near-end feed(er) reactor and distal line reactor, hold
Row traveling-wave protection and voltage jump amount are protected, if the failure that is short-circuited in region (such as the short circuit of c points), sends corresponding line two
End dc circuit breaker trip command, as shown in Figure 5.Wherein, Protection Principle of Travelling Wave is：
In formula, PdifFor direct current side pole mould ripple；GcomFor DC side topotype ripple；ZdifFor direct current side pole mould natural impedance；ZcomFor
DC side topotype natural impedance；Idif、UdifFor system differential-mode component；Icom、UcomFor system common-mode component；△ 1 is pole ripple rate of change
Setting valve；△ 2 is pole ripple setting valve；△ 3 is topotype ripple setting valve.
Voltage jump amount protection philosophy is：
In formula, dusetFor voltage change ratio setting valve；UsetFor DC voltage setting valve；disetFor DC current rate of change
Setting valve.
The quick trigger method of dc circuit breaker of the present invention is as follows：When the second protection zone failure, need to simultaneously switch off
The dc circuit breaker at all DC line two ends being connected with failure current conversion station can realize that the accurate of faulty line isolates, such as
Shown in Fig. 4；When the region on the first protection zone, DC line between near-end feed(er) reactor and distal line reactor occurs
During failure, it is only necessary to disconnect the dc circuit breaker at trouble point place DC line two ends, you can accurate isolated fault circuit, such as scheme
Shown in 3；When the first protection zone, the second protection zone failure, distal end current conversion station will can't detect failure, but must trigger
Dc circuit breaker disconnects, therefore must just receive the detection of near terminal fault with positioning result and trigger breaker actuation.
It follows that the action of cut-offfing of dc circuit breaker is controlled by four instructions, near-end circuit failure detection result, near-end
Failure detection result, near-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) near-end circuit failure detection result：When near-end DC line fault detection means detects the 3rd protection zone
During the failure that is inside short-circuited, indicate the failure and trigger the disconnection of near-end dc circuit breaker, while the detection of far-end fault detection means
To line fault and trigger distal end dc circuit breaker and disconnect, realize the isolation of faulty line.
(2) failure detection result between near-end dc circuit breaker and line reactance：When detection means detects the first protection
During the failure that is short-circuited in region, indicate that the position is broken down, and trigger the disconnection of near-end dc circuit breaker, but now distal end event
Barrier detection means cannot detect the failure, it is impossible to trigger distal end dc circuit breaker and disconnect, it is therefore desirable to by near-end fault detect
As a result transmit to distal end to trigger distal end dc circuit breaker disconnection, realize the isolation of faulty line.
(3) near-end dc circuit breaker valve side short trouble testing result：When detection means is detected in the second protection zone
During the failure that is short-circuited, indicate that the region is broken down, and it is straight to trigger all DC line near-ends being connected with failure current conversion station
Stream chopper disconnects, but now other far-end fault detection means cannot detect the failure, it is impossible to trigger distal end direct current interruption
Device disconnects, it is therefore desirable to transmits near-end failure detection result to distal end to trigger distal end dc circuit breaker disconnection, realizes failure
The isolation of circuit.
(4) distal end dc circuit breaker action command：It is similar with the analysis of above-mentioned (2), (3), when distal end dc circuit breaker with
When circuit or distal end dc bus break down between line reactance, near-end protection device can't detect failure, need distal end
Dc circuit breaker action command transmit to near-end, trigger near-end chopper and disconnect the isolation for realizing faulty line.
Above-mentioned four kinds of situations all should trigger dc circuit breaker action and cut-off, therefore dc circuit breaker cut-offs instruction and is total to by four
With sending, when at least one testing result is effective, dc circuit breaker is that action is cut-off, as shown in Figure 6.
The present invention 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 rate of change, and according to the difference of abort situation, failure is divided into into trizonal failure：Direct current
The failure of reactive circuitry side failure, the failure between dc circuit breaker and direct current reactor and near-end dc circuit breaker valve side.
When direct current reactor line side failure (refer to occur between two direct current reactors on DC line failure),
Traveling-wave protection that circuit two 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, distal end institute configuration protection strategy
Cannot detect failure, and proximally by detection direct current reactance line side, two measuring points in dc circuit breaker line side it is differential
Current changing rate realizes fault detection and location, and then triggers dc circuit breaker action, and by breaker actuation signal transmission extremely
Distal end dc circuit breaker.
When near-end dc circuit breaker valve side failure (referring to the failure of DC line between dc circuit breaker and inverter), far
End institute configuration protection strategy cannot equally detect failure, and proximally by detection change of current valve outlet port DC bus current, and change
The rate of change of the near-end dc circuit breaker electric current of the connected all circuits of stream device realizes fault detection and location, and then triggers direct current
Breaker actuation, and by breaker actuation signal transmission to distal end dc circuit breaker.
In sum, short trouble guard method proposed by the present invention is directed to flexible direct current network system, in DC line
Any place be short-circuited failure when, the quick detection of failure can be realized with positioning.
Claims (8)
1. a kind of flexible direct current network system direct-current short circuit fault protecting method, it is characterised in that for a DC line, will
Part between its side inverter and near-end feed(er) reactor is divided into first, second two protection zones, the first protection zone
Including the region between the reactor and dc circuit breaker of near-end circuit, the second protection zone includes dc circuit breaker and inverter
Between region；
For the first protection zone, using dc circuit breaker electric current and near-end circuit reactor current as differential input, difference is performed
Dynamic protection, if being short-circuited failure in the first protection zone, at least sends corresponding line near-end dc circuit breaker trip command；
For the second protection zone, the near-end of all circuits being connected with inverter with change of current valve outlet port DC bus current is straight
Stream circuit breaker current is differential input, performs differential protection, if the second protection zone internal fault, is at least sent and inverter phase
The trip command of all circuit near-end choppers even.
2. flexible direct current network system direct-current short circuit fault protecting method according to claim 1, it is characterised in that described
First protection zone, the differential protection of the second protection zone are the differential protections with difference current rate of change as criterion.
3. flexible direct current network system direct-current short circuit fault protecting method according to claim 1, it is characterised in that described
During the failure that is short-circuited in first, second protection zone, also send to corresponding distal end dc circuit breaker on the DC line
Trip command.
4. flexible direct current network system direct-current short circuit fault protecting method according to claim 1, it is characterised in that for
One DC line, also including the 3rd protection zone between near-end feed(er) reactor and distal line reactor, for
3rd protection zone, performs traveling-wave protection and the protection of voltage jump amount, if being short-circuited failure in region, sends corresponding line
Two ends dc circuit breaker trip command.
5. a kind of flexible direct current network system direct-current short circuit failure protecting device, it is characterised in that include with lower unit：
For to a DC line, the part between its side inverter and near-end feed(er) reactor being divided into into first, second
Two protection zones, the first protection zone includes the region between the reactor and dc circuit breaker of near-end circuit, the second protection
Region 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 near-end circuit reactor current as differential input, performing
Differential protection, if being short-circuited failure in the first protection zone, at least sends the tripping operation of corresponding line near-end dc circuit breaker and refers to
The unit of order；
For to the second protection zone, the near-end of all circuits being connected with inverter with change of current valve outlet port DC bus current
Dc circuit breaker electric current is differential input, differential protection is performed, if the second protection zone internal fault, at least sends and inverter
The unit of the trip command of connected all circuit near-end choppers.
6. flexible direct current network system direct-current short circuit failure protecting device according to claim 5, it is characterised in that described
First protection zone, the differential protection of the second protection zone are the differential protections with difference current rate of change as criterion.
7. flexible direct current network system direct-current short circuit failure protecting device according to claim 5, it is characterised in that described
During the failure that is short-circuited in first, second protection zone, also include for disconnected to corresponding distal end direct current on the DC line
Road device sends the unit of trip command.
8. flexible direct current network system direct-current short circuit failure protecting device according to claim 5, it is characterised in that to institute
A DC line is stated, also includes being defined as the 3rd for the position between nearly end line reactor and distal line reactor
Protection zone, for the 3rd protection zone, performs traveling-wave protection and the protection of voltage jump amount, if being short-circuited failure in region,
Then send the unit of corresponding line two 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565521A (en) * | 2017-09-22 | 2018-01-09 | 南方电网科学研究院有限责任公司 | A kind of method for removing flexible direct current power network 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 |
| CN109103858A (en) * | 2018-10-18 | 2018-12-28 | 南京南瑞继保电气有限公司 | A kind of parallel connection multiterminal topology direct current branch line protection method |
| CN110907746A (en) * | 2018-09-18 | 2020-03-24 | 深圳供电局有限公司 | High-voltage alternating-current line open-circuit fault identification method, device, equipment and storage medium |
| 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 |
| WO2022193709A1 (en) * | 2021-03-15 | 2022-09-22 | 南方电网科学研究院有限责任公司 | Short-circuit protection method and apparatus for bridge arm reactors in flexible direct-current power transmission system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565521A (en) * | 2017-09-22 | 2018-01-09 | 南方电网科学研究院有限责任公司 | A kind of method for removing flexible direct current power network dc-side short-circuit fault |
| 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 |
| CN110907746A (en) * | 2018-09-18 | 2020-03-24 | 深圳供电局有限公司 | High-voltage alternating-current line open-circuit fault identification method, device, equipment and storage medium |
| CN109103858A (en) * | 2018-10-18 | 2018-12-28 | 南京南瑞继保电气有限公司 | A kind of parallel connection multiterminal topology direct current branch line protection method |
| WO2022193709A1 (en) * | 2021-03-15 | 2022-09-22 | 南方电网科学研究院有限责任公司 | Short-circuit protection method and apparatus for bridge arm reactors in 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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| Publication number | Publication date |
|---|---|
| CN106684841B (en) | 2018-12-07 |
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