CN106936120A - A kind of direct current network line fault protection method - Google Patents
A kind of direct current network line fault protection method Download PDFInfo
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- CN106936120A CN106936120A CN201511021554.0A CN201511021554A CN106936120A CN 106936120 A CN106936120 A CN 106936120A CN 201511021554 A CN201511021554 A CN 201511021554A CN 106936120 A CN106936120 A CN 106936120A
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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
- H02H7/265—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 making use of travelling wave theory
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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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
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- Theoretical Computer Science (AREA)
- Emergency Protection Circuit Devices (AREA)
- Locating Faults (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The present invention relates to a kind of direct current network line fault protection method, including：Each measurement point travelling wave signal of real-time monitoring, if reaching the given threshold of protection, the corresponding dc circuit breaker of tripping, the final all breakers of tripping realize 3 separation of direct current subsystem, and switch the control model of each subsystem current conversion station., by fault location logic, judgement is in subsystem area or external area error for the traveling wave obtained according to measurement point and each subsystem.If fault location logic judgment is subsystem external failure, guilty culprit circuit is determined according to fault location logic；Otherwise it is determined as subsystem internal failure.According to scheduling system command, change the control model and power control instruction of each current conversion station.The time required to technical scheme effectively shortens fault location, while reducing power transfer and its influence to ac and dc systemses stability that direct current network locking on a large scale brings as far as possible.The method for being proposed will not cannot be applicable with the complication of direct current network structure.
Description
Technical field
The present invention relates to a kind of fault protecting method of power system direct current network technology, and in particular to a kind of direct current network circuit event
Barrier guard method.
Background technology
The energy transmission system that direct current network is made up of a large amount of DC terminals with DC form interconnection, international conference on large HV electric systems
(CIGRE) tissue is for the definition of direct current network：The DC network being made up of the converter of the netted and radial connection of multiple,
It is the Important Platform for implementing new energy strategy and optimization energy resources configuration, it covers the links such as transmission of electricity, power transformation, distribution,
Using advanced HVDC Transmission Technology, the access technology and Large Copacity long distance delivery of extensive renewable energy power generation are capable of achieving,
Improve efficiency of energy utilization, it is ensured that safe and reliable, high-quality supply of electric power.Direct current network is in the absence of intrinsic same of AC network
Step stable problem, transmission range is substantially unrestricted, large-scale power flow regulating and control can be realized, to development of renewable energy
Electricity has a notable supporting role, and with many merits such as via net loss is small, small to Communication Jamming.With voltage source converter,
The development of the technologies such as dc circuit breaker, DC converter, direct current cables is increasingly mature, and direct current network technology develops into possibility,
And access in large-scale distributed regenerative resource, ocean archipelago powers, send out in marine wind electric field cluster, new city electricity
The aspects such as net structure, it is considered to be maximally effective technical scheme, it has also become the important directions of following intelligent grid development.
Direct current network is also required to build requirement of the complete protection system to meet its operation steady in a long-term.In general, direct current
Net needs to realize fault fast positioning, isolation and protection act in 5ms, in case locking system collapses.However, compared to exchange
System, straight-flow system damping is much smaller, and fault progression process faster, is required protection quick-action, selectivity etc. higher；Separately
On the one hand, compared to two-terminal direct current transmission system, the increase of direct current network circuit and the complication of grid structure are caused to circuit
Error protection demand and more and more higher is required, existing two ends direct current protecting technology is no longer applicable.
Specifically, firstly, since system damping is low, it is necessary to realize the quick positioning of failure within Millisecond；Meanwhile,
Under some failures, less, fault location difficulty further increases adjacent lines fault stress difference.Secondly, in order to ensure the change of current
The safety of valve equipment is but more according to modularization, it is necessary to realize the quick suppression of larger fault current in several milliseconds even
Level converter, its fault current climbing is up to 5kA/ms under DC bipolar short trouble.Again, circuit network causes
Each branch trouble unbalanced stress weighing apparatus, causes dc circuit breaker to configure difficulty and increases.Finally, direct current network protection comprising current conversion station,
The plurality of devices such as DC line, bus are protected, and various kinds of equipment main protection needs to redesign with back-up protection design；Additionally, each
Kind equipment protection sequential etc. requires to be not quite similar, and protection cooperation difficulty is larger.
Protective strategy in view of the equipment such as in current conversion station is relatively ripe, and the existing research of direct current network has focused largely on AC line
The aspects such as the protection cooperation of road fault location and current conversion station.And it is most for the research of the aspects such as direct current network line fault positioning
Use for reference the existing achievement in research of multi-terminal direct current transmission system.
" time-domain fault location method of multibranch direct current line in multiterminal direct current power transmission system " (application number of Song Guobing, Cai Xinlei et al.：
201110350573.3), it is proposed that a kind of time domain Fault Locating Method of multi-terminal direct current transmission system branch road circuit.The method is based on
Distributed parameter model, determines fault branch, then perfect branch voltage and electric current by all by calculating contrast circuit end points voltage
Fault location is realized with another electrical quantity of fault branch.However, it is desirable to be pointed out that the method is needed each branch road measuring point electrical quantity
It is collected to fault location protection device and position of failure point is calculated and determined, substantially still falls within both-end Fault Locating Method, therefore
In the presence of certain call duration time, the quick positioning for realizing trouble point is not beneficial to.
A kind of " Modular multi-level multi-terminal flexible direct current system direct current fault handling method " (application number of Lin Chang, He Zhiyuan et al.：
201210537259.0), it is proposed that it is a kind of suitable for multi-terminal flexible direct current system direct current is bipolar, the detection of monopole failure and treatment side
Method.The power information that the method passes through real-time detection DC line two ends, by contrasting electric current difference and both positive and negative polarity between two ends
The difference of line voltage determines faulty line and fault category, then coordinates the reconstruction of system of realizing by the locking with transverter.By
This is visible, and the method still needs real-time detection, the electrical quantity at contrast circuit two ends, is unfavorable for the fast quick-recovery of direct current network.
" a kind of method of discrimination and device of the fault branch of multiterminal element route protection " (application number of Shi Shihong, Jia Hongzhou et al.：
201410016024.6), it is proposed that a kind of guard method of conventional multiterminal element line fault and device.Its Fault Locating Method leads to
Structure travelling waves function is crossed, is carried out failure judgement and circuit is occurred.However, the method be by glazing bar branch road wave impedance it is identical premised on
Condition, have ignored influence of the velocity of wave to traveling wave detector；Additionally, the method still needs each current conversion station traveling wave of contrast reaches the time,
Arbitration unit and communication time delay more long is still present；Finally, with the complication of straight-flow system line construction, the method
Applicability is still needed and further verify.
The weak point of existing direct current network line fault protection method can be summarized as at 2 points：First, in the presence of communication time delay more long,
It is unfavorable for the realization of fast failure positioning；Second, the protection application demand of large-scale direct current power network cannot be applied in implementation.
The content of the invention
To solve above-mentioned deficiency of the prior art, it is an object of the invention to provide a kind of direct current network line fault protection method,
The time required to effectively shortening fault location using subsystem partition protecting structure and the traveling wave method without communication delay, while to the greatest extent may be used
Power transfer and its influence to ac and dc systemses stability that direct current network locking on a large scale brings can be reduced.The side for being proposed
Method will not cannot be applicable with the complication of direct current network structure.
The purpose of the present invention is realized using following technical proposals：
The present invention provides a kind of direct current network line fault protection method, and the direct current network includes current conversion station #1, #2, #3, #4
And #5, and its corresponding dc bus B1, B2, B3, B4 and B5, DC power transmission line L12、L15、L25、L45And L23,
Dc circuit breaker DB12、DB21、DB15、DB51、DB25And DB52, and electric signal measurement apparatus；The direct current is defeated
Electric line L12It is connected with dc bus B1 and B2 respectively；The DC power transmission line L15Respectively with dc bus B1 and B5
Connection；The DC power transmission line L25It is connected with dc bus B2 and B5 respectively；The DC power transmission line L45Respectively with
Dc bus B4 and B5 are connected；The DC power transmission line L23It is connected with dc bus B2 and B3 respectively；The direct current
Net is divided into 3 direct current subsystems, respectively subsystem 1：Including current conversion station #1, dc circuit breaker DB12And DB15And
Corresponding electric signal measurement apparatus；Subsystem 2：Including current conversion station #2 and #3, dc circuit breaker DB21And DB25And it is right
The electric signal measurement apparatus answered；Subsystem 3：Including current conversion station #3, #4, dc circuit breaker DB51And DB52And it is corresponding
Electric signal measurement apparatus；Electric signal measurement apparatus are used to measure travelling wave signal；
The guard method comprises the steps：
(1) travelling wave signal of real-time monitoring measurement point, if reaching the given threshold of travelling wave signal protection, the corresponding direct current of tripping
Breaker, the final all dc circuit breakers of tripping realize 3 separation of direct current subsystem, and switch the control of subsystem current conversion station
Pattern；Given threshold by failure during each circuit traveling wave carry out comprehensive determination；
(2) by fault location logic, failure judgement is in subsystem area to the travelling wave signal and subsystem for being obtained according to measurement point
Failure or external area error；Fault location logic is fault location algorithm, including uses Travelling Wave Fault Location algorithm, i.e., by row
Ripple wave head size and polarity determine guilty culprit circuit；
(3) if it is external area error that fault location logic judgment is subsystem, failure institute is determined further according to fault location logic
In circuit；Otherwise it is determined as subsystem troubles inside the sample space；
(4) if failure is subsystem external area error, and it is positioned at faulty line L12, then non-event is re-closed after setting time
Barrier circuit dc circuit breaker DB15、DB51、DB25And DB52；If failure is subsystem troubles inside the sample space, and is positioned at fault wire
Road L23, then the corresponding dc circuit breaker DB of coincidence non-faulting subsystem after setting time15、DB51、DB12And DB52；
(5) according to scheduling system command, the control model and power control instruction of current conversion station are changed.
Further, in the step (1), the travelling wave signal includes voltage and current travelling wave signal, respectively voltage traveling wave
Signal S1、S2And S5And current traveling wave signal S12、S21、S15、S51、S25、S52、S54And S23, using wavelet transformation
Analysis method extracts the characteristic component of traveling wave；Separated by forward and reverse traveling wave, and cubic spline wavelet change is carried out to backward-travelling wave
Change decomposition and extract characteristic component；
The given threshold of the travelling wave signal protection is, it is necessary to consider the influence of different faults type and abort situation, and meet
The requirement of subsystem reliable separation under step (1) each failure；
The control model of the switching subsystem current conversion station is that final result is each subsystem to ensure the DC voltage stability of subsystem
At least 1 current conversion station of system participates in the control of the subsystem DC voltage.
Further, in the step (2), fault location logic is：Judged with polarity by the size of relatively more initial traveling wave
It is subsystem troubles inside the sample space or external area error；When the initial traveling wave signal polarity of electric current is identical, and with circuit travelling wave signal pole in area
Property is conversely, then judge that subsystem is troubles inside the sample space；
The initial traveling wave opposite polarity of each electric current of subsystem, and negative polarity amplitude is about 2 times of positive polarity amplitude, then judge subsystem
It is external area error to unite.
Further, in the step (3), in the step (3), for circuit L12, the initial traveling wave of the electric current of subsystem 1
S12Polarity is anti-, the initial traveling wave S of electric current15For just, and the initial traveling wave S of electric current12Wave head amplitude is S15About 2 times, then judge
Failure is external area error, and failure is located at circuit L12；For circuit L25, the initial traveling wave S of electric current of subsystem 221Polarity be it is anti-,
The initial traveling wave S of electric current25For just, and the initial traveling wave S of electric current21Wave head amplitude is S25About 2 times, then failure judgement is that area is outer former
Barrier, and failure is located at circuit L25；For circuit L15, the initial traveling wave S of electric current of subsystem 351Polarity is anti-, electric current initial row
Ripple S52For just, and the initial traveling wave S of electric current51Wave head amplitude is S52About 2 times, then failure judgement is external area error, and failure
Positioned at circuit L15。
Further, in the step (4), for subsystem 1, if the initial travelling wave signal S of electric current12And S15Polarity is identical then
It is troubles inside the sample space, is otherwise external area error；For subsystem 2, if the initial travelling wave signal S of electric current21、S25With approximate wave head
Amplitude and identical polarity of traveling wave, and with travelling wave signal S23Opposite polarity, then be judged to troubles inside the sample space, is otherwise external area error；
For subsystem 3, if the initial travelling wave signal S of electric current51、S52With approximate wave head amplitude and identical polarity of traveling wave, and with
Travelling wave signal S54Opposite polarity, then be judged to troubles inside the sample space, is otherwise external area error；
Subsystem recovers setting time time delay and is adjusted according to the running status of fault condition and dc circuit breaker；Setting time
It is 5ms；The dc circuit breaker reclosing actuating signal is generated by the logic based on each measuring point signal of local current conversion station, including area
The outer fault distinguishing logic generation of inner region.
Further, in the step (5), the control model refers to DC voltage control and active power controller；The work(
Rate control instruction refers to active power controller instruction.
Compared with immediate prior art, the excellent effect that the technical scheme that the present invention is provided has is：
A kind of direct current network line fault protection method provided by the present invention, using traveling wave fault protection and event based on local signal
Barrier localization method, it is to avoid cause the current conversion station long period to bear overvoltage or overcurrent stress because fault location time is more long.Together
When, using subsystem partition protecting strategy, on the one hand contribute to quickly isolating for malfunctioning sub-system；On the other hand then protect as far as possible
The continuous service of direct current network system is demonstrate,proved, has been reduced because of the influence that total system is stopped transport to ac and dc systemses stability.The present invention sets
The advantage of meter is summarized as follows：
(1) using the traveling wave fault protection based on local signal and Fault Locating Method, it is to avoid lead because fault location time is more long
The current conversion station long period is caused to bear overvoltage or overcurrent stress；
(2) subsystem partition protecting strategy is used, quickly isolating for malfunctioning sub-system is realized；
(3) continuous service of direct current network system is ensure that as far as possible, is reduced because total system is stopped transport to ac and dc systemses stability
Influence.
(4) guard method can be extended to more massive direct current network, it will not be reduced because of the change of direct current network structure and is applicable
Property.
Brief description of the drawings
Fig. 1 is the five end direct current network topologys and partition protecting schematic diagram that the present invention is provided；
Fig. 2 is the flow chart of the direct current network line fault protection method that the present invention is provided.
Specific embodiment
Specific embodiment of the invention is described in further detail below in conjunction with the accompanying drawings.
The following description and drawings fully show specific embodiments of the present invention, to enable those skilled in the art to put into practice it
.Other embodiments can include structure, logic, it is electric, process and it is other changes.Embodiment only generation
The possible change of table.Unless explicitly requested, otherwise single component and function are optional, and the order for operating can change.
The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.Implementation of the invention
The gamut of the scope of scheme including claims, and claims all obtainable equivalent.Herein,
These embodiments of the invention can individually or generally be represented that it is convenient that this is used for the purpose of with term " invention ", and
And if in fact disclosing the invention more than, the scope for being not meant to automatically limit the application is any single invention or hair
Bright design.
The present invention provide a kind of five end direct current network topology as shown in figure 1, it include 5 current conversion stations (#1, #2, #3, #4 and
#5), 5 dc bus (B1, B2, B3, B4 and B5) and 5 DC power transmission line (L12、L15、L25、L45With
L23), modularization multi-level converter (the Modular Multilevel more popular in the world at present that wherein current conversion station is used
Converter, MMC), submodule (Sub Module) is semibridge system structure (HalfBridge).Current conversion station #1, #2 and #3
With DC line L12、L15And L25Constitute one it is mesh-structured, any circuit is exited and will not cause current conversion station #1, #2
Or #3 departs from power network.The DC power transmission line L12It is connected with dc bus B1 and B2 respectively；The DC power transmission line L15
It is connected with dc bus B1 and B5 respectively；The DC power transmission line L25It is connected with dc bus B2 and B5 respectively；It is described
DC power transmission line L45It is connected with dc bus B4 and B5 respectively；The DC power transmission line L23Respectively with dc bus B2
Connected with B3；Each DC line has been equipped with 6 sets of dc circuit breaker (DB12、DB21、DB15、DB51、DB25With
DB52) and its protection use electric signal measurement apparatus.Wherein, electric signal measurement apparatus are mainly used in the signal (S such as measurement traveling wave1、
S2、S5、S12、S21、S15、S51、S25、S52、S54And S23), instruction is cut-off with determine dc circuit breaker, its electric current row
Ripple is referred to flow out current conversion station as positive direction.Each dc circuit breaker is integrated in and bus B1, B2 and B5 respectively with measurement apparatus
In corresponding 3 current conversion stations.Whole 5 end direct current network is divided into 3 systems, and respectively subsystem 1 is (only including the change of current
Stand #1 and its correspondence dc circuit breaker and measurement apparatus), subsystem 2 is (comprising current conversion station #2, #3 and its corresponding direct current interruption
Device and measurement apparatus) and subsystem 3 (including current conversion station #3, #4 and its corresponding dc circuit breaker and measurement apparatus).
Related description is carried out to the direct current network partition protecting method detailed step with reference to Fig. 1：
(1) each measurement point travelling wave signal of real-time monitoring, if reaching the given threshold of protection, the corresponding dc circuit breaker of tripping,
The final all breakers of tripping realize 3 separation of direct current subsystem, and switch the control model of each subsystem current conversion station.
Travelling wave signal described in step (1) includes voltage and current travelling wave signal, can be using analysis sides such as existing wavelet transformations
Method extracts the characteristic component of traveling wave.
Rotection thresholds described in step (1) are, it is necessary to consider the influence of different faults type and abort situation, and meet step
(1) under each failure subsystem reliable separation requirement.
Each subsystem current conversion station control model of switching described in step (1) is in order to ensure the DC voltage stability of the system, finally
Result is the control that at least 1 current conversion station of each subsystem participates in the subsystem DC voltage.
(2) according to the traveling wave that obtains of each measurement point and each subsystem by fault location logic, judgement be in subsystem the area in and also
It is external area error.
The outer fault distinguishing of subsystem area inner region described in step (2) can be determined by the size of relatively more initial traveling wave with polarity：It is right
In subsystem 1, if the initial traveling wave S of electric current12、S15It is then troubles inside the sample space that polarity is identical, is otherwise external area error；For subsystem
2 are, if the initial traveling wave S of electric current21、S25With approximate wave head amplitude and identical polarity of traveling wave, and and S23Opposite polarity,
Then it is judged to line fault in area (such as F2), is otherwise external area error；For subsystem 3, if the initial travelling wave signal S of electric current51、
S52With approximate wave head amplitude and identical polarity of traveling wave, and with travelling wave signal S54Opposite polarity, then be judged to event in area
Barrier, is otherwise external area error；
(3) if fault location logic judgment is subsystem external failure, guilty culprit is determined further according to fault location logic
Circuit；Otherwise it is determined as subsystem internal failure.
The method for further determining that external area error circuit described in step (3)：With circuit L12As a example by, the electric current of subsystem 1 is initial
Traveling wave S12Polarity is anti-, S15For just, and S12Wave head amplitude is S152 times or so, then failure be located at the circuit (such as failure
F1)；Similarly, the initial traveling wave S of electric current according to subsystem 221And S25Also guilty culprit circuit is determined；After failure F1 generations,
The initial traveling wave S of the electric current of subsystem 351And S52Difference is little.All other routes failure has similar differentiation logic.
(4) if failure is subsystem external failure, and it is positioned at faulty line L12(such as failure F1), then recover according to system
Logic after setting time (5ms or so) re-closes non-fault line dc circuit breaker DB15、DB51、DB25And DB52；
If failure is subsystem internal failure (such as failure F2 of subsystem 2), logic (5ms after setting time is recovered according to system
Left and right) the corresponding dc circuit breaker DB of the closure that overlaps non-faulting subsystem15、DB51、DB12And DB52。
System described in step (4) recovers setting time delay can carry out appropriateness according to the running status of fault condition and dc circuit breaker
Regulation.If low current fault or dc circuit breaker arrester have fully let out energy, then the setting time can suitably be compressed, to enter
One step reduces system recovery time.
Dc circuit breaker reclosing actuating signal described in step (4) is generated by the logic based on each measuring point signal of local current conversion station,
In the absence of long-time communication delay.
(5) according to scheduling system command, the control model and power control instruction of each current conversion station are changed.
Control model described in step (5) refers to DC voltage control and active power controller；Described power control instruction is main
It refer to active power controller instruction.
Special instruction is if without the outer fault distinguishing logic of step (2) area's inner region, just cannot carry out standard to faulty line
Definitely remove, and realize the reconstruction of straight-flow system；If the outer fault distinguishing logic of step (2) area's inner region, you can be failure
Further determining that for circuit lays the foundation.
Special instruction is, if further positioned without step (3) the external area error circuit, cannot just to realize to faulty line
Accurate excision, and then the selectivity of protection can be reduced；If step (3) the external area error circuit is further positioned, can
Maximize the integrality for ensureing straight-flow system.
The present invention is on the basis of the research of existing DC circuit protection technique, it is proposed that a kind of direct current network line fault partition protecting
Method.According to ac and dc systemses design requirement, the configuration of direct current system subdivision and dc circuit breaker is realized；Protected using traveling wave
The methods such as shield realize that the subregion of trouble point is substantially positioned, and the quick separating of subsystem is realized by dc circuit breaker；Finally, close
Non-fault line dc circuit breaker realizes re-establishing for direct current network.The present invention is using subsystem partition protecting structure and without communication
The time required to the traveling wave method of time delay effectively shortens fault location, while reducing direct current network as far as possible, locking brings on a large scale
Power transfer and its influence to ac and dc systemses stability.The method for being proposed will not be with the complication of direct current network structure
Cannot be applicable.
The above embodiments are merely illustrative of the technical solutions of the present invention rather than its limitations, although with reference to above-described embodiment to the present invention
Be described in detail, those of ordinary skill in the art specific embodiment of the invention can still be modified or
Person's equivalent, these are applying for this pending hair without departing from any modification of spirit and scope of the invention or equivalent
Within bright claims.
Claims (6)
1. a kind of direct current network line fault protection method, the direct current network includes current conversion station #1, #2, #3, #4 and #5,
And its corresponding dc bus B1, B2, B3, B4 and B5, DC power transmission line L12、L15、L25、L45And L23, direct current
Breaker DB12、DB21、DB15、DB51、DB25And DB52, and electric signal measurement apparatus；The DC transmission line
Road L12It is connected with dc bus B1 and B2 respectively；The DC power transmission line L15It is connected with dc bus B1 and B5 respectively；
The DC power transmission line L25It is connected with dc bus B2 and B5 respectively；The DC power transmission line L45It is female with direct current respectively
Line B4 and B5 are connected；The DC power transmission line L23It is connected with dc bus B2 and B3 respectively；The direct current network is drawn
It is divided into 3 direct current subsystems, respectively subsystem 1：Including current conversion station #1, dc circuit breaker DB12And DB15And it is corresponding
Electric signal measurement apparatus；Subsystem 2：Including current conversion station #2 and #3, dc circuit breaker DB21And DB25And corresponding electricity
Gas signal measurement apparatus；Subsystem 3：Including current conversion station #3, #4, dc circuit breaker DB51And DB52And corresponding electric letter
Number measurement apparatus；Electric signal measurement apparatus are used to measure travelling wave signal；
The guard method comprises the steps：
(1) travelling wave signal of real-time monitoring measurement point, if reaching the given threshold of travelling wave signal protection, the corresponding direct current of tripping
Breaker, the final all dc circuit breakers of tripping realize 3 separation of direct current subsystem, and switch the control of subsystem current conversion station
Pattern；Given threshold by failure during each circuit traveling wave carry out comprehensive determination；
(2) by fault location logic, failure judgement is in subsystem area to the travelling wave signal and subsystem for being obtained according to measurement point
Failure or external area error；Fault location logic is fault location algorithm, including uses Travelling Wave Fault Location algorithm, i.e., by row
Ripple wave head size and polarity determine guilty culprit circuit；
(3) if it is external area error that fault location logic judgment is subsystem, failure institute is determined further according to fault location logic
In circuit；Otherwise it is determined as subsystem troubles inside the sample space；
(4) if failure is subsystem external area error, and it is positioned at faulty line L12, then non-event is re-closed after setting time
Barrier circuit dc circuit breaker DB15、DB51、DB25And DB52；If failure is subsystem troubles inside the sample space, and is positioned at fault wire
Road L23, then the corresponding dc circuit breaker DB of coincidence non-faulting subsystem after setting time15、DB51、DB12And DB52；
(5) according to scheduling system command, the control model and power control instruction of current conversion station are changed.
2. direct current network line fault protection method as claimed in claim 1, it is characterised in that in the step (1),
The travelling wave signal includes voltage and current travelling wave signal, respectively voltage traveling wave signal S1、S2And S5And current traveling wave signal
S12、S21、S15、S51、S25、S52、S54And S23, the characteristic component of traveling wave is extracted using wavelet transformation analysis method；It is logical
Cross forward and reverse traveling wave to separate, and extraction characteristic component is decomposed using Cubic Spline Wavelet Transform method；
The given threshold of the travelling wave signal protection is, it is necessary to consider the influence of different faults type and abort situation, and meet
The requirement of subsystem reliable separation under step (1) each failure；
The control model of the switching subsystem current conversion station is that final result is each subsystem to ensure the DC voltage stability of subsystem
At least 1 current conversion station of system participates in the control of the subsystem DC voltage.
3. direct current network line fault protection method as claimed in claim 1, it is characterised in that in the step (2),
Fault location logic is：Subsystem troubles inside the sample space or external area error are judged with polarity by the size of relatively more initial traveling wave；
When the initial traveling wave signal polarity of electric current is identical, and with circuit travelling wave signal opposite polarity in area, then judge that subsystem is troubles inside the sample space；
The initial traveling wave opposite polarity of each electric current of subsystem, and negative polarity amplitude is 2 times of positive polarity amplitude, then judge subsystem
It is external area error.
4. direct current network line fault protection method as claimed in claim 1, it is characterised in that in the step (3),
For circuit L12, the initial traveling wave S of the electric current of subsystem 112Polarity is anti-, the initial traveling wave S of electric current15For just, and electric current initial row
Ripple S12Wave head amplitude is S152 times, then failure judgement be external area error, and failure be located at circuit L12；For circuit L25,
The initial traveling wave S of electric current of subsystem 221Polarity is anti-, the initial traveling wave S of electric current25For just, and the initial traveling wave S of electric current21Wave head width
It is S to be worth252 times, then failure judgement be external area error, and failure be located at circuit L25；For circuit L15, the electricity of subsystem 3
Flow initial traveling wave S51Polarity is anti-, the initial traveling wave S of electric current52For just, and the initial traveling wave S of electric current51Wave head amplitude is S522 times,
Then failure judgement is external area error, and failure is located at circuit L15。
5. direct current network line fault protection method as claimed in claim 1, it is characterised in that in the step (4),
For subsystem 1, if the initial travelling wave signal S of electric current12And S15It is then troubles inside the sample space that polarity is identical, is otherwise external area error；It is right
In subsystem 2, if the initial travelling wave signal S of electric current21、S25With approximate wave head amplitude and identical polarity of traveling wave, and with row
Ripple signal S23Opposite polarity, then be judged to troubles inside the sample space, is otherwise external area error；For subsystem 3, if the initial traveling wave of electric current
Signal S51、S52With approximate wave head amplitude and identical polarity of traveling wave, and with travelling wave signal S54Opposite polarity, then judge
It is troubles inside the sample space, is otherwise external area error；
Subsystem recovers setting time time delay and is adjusted according to the running status of fault condition and dc circuit breaker；Setting time
It is 5ms；The dc circuit breaker reclosing actuating signal is generated by the logic based on each measuring point signal of local current conversion station, including area
The outer fault distinguishing logic generation of inner region.
6. direct current network line fault protection method as claimed in claim 1, it is characterised in that in the step (5),
The control model refers to DC voltage control and active power controller；The power control instruction refers to active power controller instruction.
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