CN107994552A - DC power distribution line back-up protection method and system, storage medium - Google Patents
DC power distribution line back-up protection method and system, storage medium Download PDFInfo
- Publication number
- CN107994552A CN107994552A CN201711213599.7A CN201711213599A CN107994552A CN 107994552 A CN107994552 A CN 107994552A CN 201711213599 A CN201711213599 A CN 201711213599A CN 107994552 A CN107994552 A CN 107994552A
- Authority
- CN
- China
- Prior art keywords
- distribution line
- power distribution
- protection
- failure
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
Abstract
The present invention provides a kind of DC power distribution line back-up protection method and system, storage medium, due to during definite fault section of the back-up protection current threshold to obtain DC power distribution line, by the changes of operating modes with straight-flow system and the fault component voltage of real-time change and definite parameter of the fault component electric current as back-up protection current threshold, using above-mentioned technical proposal, the fault section that can solve DC power distribution line in correlation technique produces change with the change of the straight-flow system method of operation, and then the problem of causing the back-up protection of DC power distribution line not run well, it can be adjusted with reaching the back-up protection of DC power distribution line with the change of the straight-flow system method of operation, ensure the effect that back-up protection can well be run.
Description
Technical field
The present invention relates to relay protection field, in particular to a kind of DC power distribution line back-up protection method and is
System, storage medium.
Background technology
DC distribution net there are to be directly accessed beneficial to distributed generation resource and DC power supply, and radius of electricity supply and capacity are big, imitate
Rate is high, and there is no frequency shift (FS) and three-phase imbalance problem, and power quality is good, and it is excellent that system structure is simple, control mode is flexible etc.
Point, just as the direction of domestic and international technology development and the hot spot of research.
Fig. 1 is DC power distribution line schematic diagram in correlation technique, as shown in Figure 1, the event that DC power distribution line may occur
In barrier, bipolar failure is most serious situation；After DC power distribution line produces bipolar failure, DC power distribution line can pass through diode
The transient state such as the capacitance discharge regime of cut-off, the capacitance discharge regime of diode current flow, inductive discharge diode continuousing flow conducting phase
Process, finally stably reaches the commutation overlap uncontrollable rectifier stage.Received since the DC converter equipment in DC power distribution line is resistance to
Stream ability is weak, and when DC Line Fault occurs, DC line can be because capacitance and discharge band be impacted, while work as DC capacitor voltage
During zero passage, the afterflow diode in transverter can further be impacted.Therefore, for DC power distribution line there may be
Failure carry out can quick acting protection processing it is most important.
Existing DC power distribution line protection is more to form quick Protection criteria using direct current transient characteristic, but for DC distribution
Line backup protection research is less.When the quick relay fail of DC power distribution line, the quality of back-up protection performance then seems
It is even more important.In prior art, the back-up protection of DC power distribution line is by comparing measured current and the definite value of setting
Whether size, judge DC power distribution line in fault section.But there are certain defect, main cause for above-mentioned breakdown judge process
It is：It is the fixed value set in advance for the definite value that compares, when the DC power distribution line method of operation changes, such as DC line
Transmission power changes, or protection installation site hvdc control mode is changed into rectification operation etc., DC power distribution line from inverter operation
Physical fault section can also produce certain change.Therefore, fixed definite value is used in correlation technique as breakdown judge
According to the change that can not then adapt to the straight-flow system method of operation.
For in correlation technique, produced for the fault section of DC power distribution line with the change of the straight-flow system method of operation
Changing, and then not yet propose have the problem of cause the back-up protection of DC power distribution line not run well, in correlation technique
The solution of effect.
The content of the invention
An embodiment of the present invention provides a kind of DC power distribution line back-up protection method and system, storage medium, with least
The fault section for solving DC power distribution line produces change with the change of the straight-flow system method of operation, and then causes DC distribution
The problem of back-up protection of circuit can not well be run.
One side according to embodiments of the present invention, there is provided a kind of back-up protection method of DC power distribution line, including：
The fault component voltage and fault component electric current of any side of the DC power distribution line are obtained, according to the failure
Component voltage determines back-up protection current threshold with fault component electric current, wherein, any side includes one below：Rectification
Side, inverter side；
After DC power distribution line produces failure, DC current after the failure of the DC power distribution line is measured；
When DC current is more than the back-up protection current threshold after the failure, DC power distribution line standby guarantor is enabled
Shield.
Preferably, the fault component voltage for obtaining any side of DC power distribution line and fault component electric current,
Including：
According to DC voltage of the back-up protection installation site before the DC power distribution line produces failure with producing failure
DC voltage afterwards obtains the fault component voltage, wherein, the back-up protection erecting device is arranged on the DC distribution
On circuit；
According to DC current of the back-up protection installation site before the DC power distribution line produces failure with producing failure
DC current afterwards obtains the fault component electric current.
Preferably, back-up protection current threshold is determined according to the fault component voltage and fault component electric current, including：
The dorsal part equivalent circuit of any side of DC power distribution line is built, wherein, the dorsal part equivalent circuit includes：Each other
The dorsal part equivalent voltage of series connection and dorsal part equivalent resistance, the dorsal part equivalent resistance is according to the fault component voltage and failure point
Electric current is measured to obtain；The back-up protection current threshold is determined according to the dorsal part equivalent circuit of structure.
DC voltage and direct current of the dorsal part equivalent circuit according to the back-up protection installation site before failure is produced
Electric current is built, or completes structure according to the DC voltage after generation failure and DC current.
Preferably, the dorsal part equivalent voltage is obtained according to following object：
According to back-up protection installation site the DC power distribution line produce failure before DC voltage and DC current,
Or DC voltage and DC current after failure are produced, and the dorsal part equivalent resistance.
Preferably, the back-up protection current threshold is determined according to the dorsal part equivalent circuit of structure, including：
Obtain the safety factor of DC power distribution line back-up protection.
Preferably, the back-up protection current threshold is determined according to the dorsal part equivalent circuit of structure, including：Obtain institute
That states DC power distribution line adjusts impedance.
Preferably, DC current includes after the failure：Steady-state DC electric current after failure, wherein, stable state after the failure
DC current includes：Enter the DC current in commutation overlap uncontrollable rectifier stage after the DC power distribution line generation failure.
Other side according to embodiments of the present invention, there is provided a kind of DC power distribution line backup protection system for damping, including：
Setting module；For setting back-up protection current threshold；
Measurement module；For after DC power distribution line produces failure, measuring straight after the failure of the DC power distribution line
Galvanic electricity stream；
Execution module；For when DC current is more than the back-up protection current threshold after the failure, enabling direct current
Distribution line back-up protection；
The setting module further includes：For obtaining fault component voltage and the event of any side of the DC power distribution line
Hinder current weight, back-up protection current threshold is determined according to the fault component voltage and fault component electric current.
Preferably, the setting module includes：
Fault component unit：For according to the DC power distribution line respective side back-up protection installation site in the direct current
DC voltage before distribution line generation failure obtains the fault component voltage and root with the DC voltage after generation failure
According to direct current of the DC power distribution line respective side back-up protection installation site before the DC power distribution line produces failure
Stream obtains the fault component electric current with the DC current after generation failure.
Dorsal part equivalent unit：For building the dorsal part equivalent circuit of any side of DC power distribution line, the dorsal part is equivalent
Direct current of the circuit according to the DC power distribution line respective side back-up protection installation site before failure is produced or after generation failure
Voltage is built with DC current.
According to still another embodiment of the invention, a kind of storage medium is also provided, the storage medium includes the journey of storage
Sequence, wherein, the method described in any of the above-described is performed when described program is run.
By the present invention, due to obtaining the mistake of the fault section of DC power distribution line in definite back-up protection current threshold
Cheng Zhong, after being used as by the changes of operating modes with straight-flow system and the fault component voltage of real-time change and fault component electric current
The definite parameter of standby protective current threshold value, using above-mentioned technical proposal, can make back-up protection current threshold with straight-flow system
The change of the method for operation and form variable；Therefore, the technical solution in the present invention can solve DC distribution line in correlation technique
The fault section on road produces change with the change of the straight-flow system method of operation, and then causes the back-up protection of DC power distribution line
The problem of can not well running, with reach the back-up protection of DC power distribution line can with the change of the straight-flow system method of operation and into
Row adjustment, it is ensured that the effect that back-up protection can well be run.
Brief description of the drawings
Attached drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is DC power distribution line schematic diagram in correlation technique；
Fig. 2 is the flow chart of the back-up protection method of DC power distribution line according to embodiments of the present invention；
Fig. 3 is the Equivalent DC system signal of DC power distribution line according to embodiments of the present invention under normal operating conditions
Figure；
Fig. 4 is that the Equivalent DC system inscribed when DC power distribution line according to embodiments of the present invention is a certain after a failure is shown
It is intended to；
Fig. 5 is the dorsal part Equivalent DC model schematic according to the DC power distribution line of the embodiment of the present invention；
Fig. 6 is the structure diagram according to the DC power distribution line backup protection system for damping of the embodiment of the present invention；
Fig. 7 is the structure diagram according to the setting module of the DC power distribution line backup protection system for damping of the embodiment of the present invention.
Embodiment
In order to make those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Attached drawing, is clearly and completely described the technical solution in the embodiment of the present invention, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's all other embodiments obtained without making creative work, should all belong to the model that the present invention protects
Enclose.
It should be noted that term " first " in description and claims of this specification and above-mentioned attached drawing, "
Two " etc. be for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so use
Data can exchange in the appropriate case, so as to the embodiment of the present invention described herein can with except illustrating herein or
Order beyond those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, be not necessarily limited to for example, containing the process of series of steps or unit, method, system, product or equipment
Those steps or unit clearly listed, but may include not list clearly or for these processes, method, product
Or the intrinsic other steps of equipment or unit.
Embodiment 1
According to embodiments of the present invention, there is provided a kind of back-up protection method of DC power distribution line, Fig. 2 are real according to the present invention
The flow chart of the back-up protection method of the DC power distribution line of example is applied, as shown in Fig. 2, this method comprises the following steps：
Step S202, obtains the fault component voltage and fault component electric current of any side of DC power distribution line, according to event
Barrier component voltage and fault component electric current determine back-up protection current threshold, wherein, any side of DC power distribution line include with
It is one of lower：Rectification side, inverter side；
Step S204, after DC power distribution line produces failure, measures DC current after the failure of DC power distribution line；
Step S206, when DC current is more than back-up protection current threshold after failure, enables DC power distribution line standby
Protection.
By the present invention, due to obtaining the mistake of the fault section of DC power distribution line in definite back-up protection current threshold
Cheng Zhong, after being used as by the changes of operating modes with straight-flow system and the fault component voltage of real-time change and fault component electric current
The definite parameter of standby protective current threshold value, using above-mentioned technical proposal, can make back-up protection current threshold with straight-flow system
The change of the method for operation and form variable；Therefore, the technical solution in the present invention can solve DC distribution line in correlation technique
The fault section on road produces change with the change of the straight-flow system method of operation, and then causes the back-up protection of DC power distribution line
The problem of can not well running, with reach the back-up protection of DC power distribution line can with the change of the straight-flow system method of operation and into
Row adjustment, it is ensured that the effect that back-up protection can well be run.
In the scheme that above-mentioned steps S202 is provided, the fault component voltage and failure of any side of DC power distribution line are obtained
The implementation of current weight can have a variety of, in an optional example, can be achieved through the following technical solutions：
According to back-up protection installation site after the DC voltage before DC power distribution line produces failure and generation failure
DC voltage obtains fault component voltage, wherein, back-up protection erecting device is arranged on DC power distribution line；
According to back-up protection installation site after the DC current before DC power distribution line produces failure and generation failure
DC current obtains fault component electric current.
It should be noted that back-up protection installation site can be any in the rectification side or inverter side in DC power distribution line
Installed side；When back-up protection installation site is installed for the rectification side in DC power distribution line, back-up protection
The method of operation is run for rectification, when back-up protection installation site is installed for the inverter side in DC power distribution line, standby
The method of operation of protection is inverter operation.
Below by way of back-up protection installation site be DC power distribution line in rectification side exemplified by illustrate：
Fig. 3 is the Equivalent DC system signal of DC power distribution line according to embodiments of the present invention under normal operating conditions
Figure, as shown in figure 3, it is u that the DC voltage before side generation failure is arranged in DC power distribution lineM, produce the direct current before failure
Flow for iM；Fig. 4 is that the Equivalent DC system inscribed when DC power distribution line according to embodiments of the present invention is a certain after a failure is shown
It is intended to, as shown in figure 4, it is u to produce the DC voltage after failureM1, the DC current produced before failure is iM1。
According to Fig. 3 and Fig. 4, then have：According to back-up protection installation site before DC power distribution line produces failure
The fault component voltage Δ u=u that DC voltage is obtained with the DC voltage after generation failureM1-uM；
According to back-up protection installation site after the DC current before DC power distribution line produces failure and generation failure
The fault component electric current Δ i=i that DC current obtainsM1-iM。
When back-up protection installation site is the inverter side in DC power distribution line, fault component voltage and fault component electricity
The calculating of stream is equal to above-mentioned calculation, fault component voltage Δ u=uN1-uN；Fault component electric current Δ i=iN1-iN。
In the scheme that above-mentioned steps S202 is provided, back-up protection electricity is determined according to fault component voltage and fault component electric current
The implementation of stream threshold value can have a variety of, in an optional example, can be achieved through the following technical solutions：
The dorsal part equivalent circuit of any side of DC power distribution line is built, wherein, dorsal part equivalent circuit includes：It is one another in series
Dorsal part equivalent voltage and dorsal part equivalent resistance, dorsal part equivalent resistance obtains according to fault component voltage and fault component electric current；
Back-up protection current threshold is determined according to the dorsal part equivalent circuit of structure.
Alternatively, dorsal part equivalent voltage is obtained according to following object：According to back-up protection installation site in DC distribution line
Road produces the DC voltage and DC current before failure, or produces the DC voltage and DC current after failure, and dorsal part etc.
Imitate resistance.
Illustrated so that back-up protection installation site is the rectification side in DC power distribution line as an example, as shown in Fig. 2, direct current
The rectification side dorsal part of distribution line under normal operating conditions can be equivalent to dorsal part equivalent voltage EMWith dorsal part equivalent resistance RMString
Connection connection, the rectification side dorsal part inscribed can be equivalent to dorsal part equivalent voltage E when DC power distribution line produces a certain after failureM1With
Dorsal part equivalent resistance RM1Be connected in series；According to the operation logic of straight-flow system, EMWith RM, and EM1With RM1Meet such as ShiShimonoseki
System：
EM-iMRM=uM
EM1-iM1RM1=uM1
For the relation of the dorsal part equivalent voltage before and after above-mentioned failure and dorsal part equivalent resistance, and hereinbefore fault component
The relation of voltage and fault component electric current carries out simultaneous solution, can obtain：
RM=RM1=-Δ u/ Δs i
EM=EM1=uM1+iM1RM1=uM+iMRM
It would know that according to above-mentioned formula, direct current of the dorsal part equivalent circuit according to back-up protection installation site before failure is produced
Voltage and DC current structure, or structure is completed according to the DC voltage after generation failure and DC current.
When back-up protection installation site is the inverter side in DC power distribution line, the structure of dorsal part equivalent circuit is equal to
Above-mentioned building mode.
Further the dorsal part equivalent circuit of rectification side in DC power distribution line and inverter side is mutually unified, according to Fig. 5
The dorsal part Equivalent DC model schematic of the DC power distribution line of the embodiment of the present invention, as shown in figure 5, DC power distribution line is whole
Dorsal part Equivalent DC model in Fig. 4 can be used by flowing the dorsal part Equivalent DC circuit of side and inverter side, the E in Fig. 5SIt is equal to
EMOr EM1, RSIt is equal to RMOr RM1；In addition, the R in Fig. 5fProduced for back-up protection installation site in DC power distribution line to failure
The equivalent d.c. resistance of position, RfMeet：
Rf=Lfr+CgRg
Wherein, LfFor the DC line length of back-up protection installation site to failure generation position, r is DC power distribution line
In every kilometer of resistance value, CgFor short dot transition resistance, RgFor penalty coefficient；RfAvailable for the reality obtained on DC power distribution line
Border electric current.
Alternatively, back-up protection current threshold is determined according to the dorsal part equivalent circuit of structure, including：Obtain DC distribution line
The safety factor of road back-up protection, sets the safety factor of DC power distribution line back-up protection as krel；Specifically, determining
Need to be in the base of the result of calculation obtained according to fault component voltage and fault component electric current during back-up protection current threshold
Safety factor k is multiplied by plinthrel, so that obtained back-up protection current threshold is amplified, and then avoid back-up protection current threshold
It is worth too small and causes the back-up protection in DC power distribution line to produce over range action.Meanwhile to avoid the protection of back-up protection
Scope is too small, krelIt is preferred that between 1.2 to 1.3.
Alternatively, back-up protection current threshold is determined according to the dorsal part equivalent circuit of structure, including：Obtain DC distribution line
Adjust impedance R in roadset.Specifically, impedance R is adjustedsetDetermined by the electric property of DC power distribution line, in back-up protection
Current threshold determine during, need to introduce and adjust impedance RsetWith with dorsal part equivalent resistance RSDefinite back-up protection electric current jointly
Threshold value.
Alternatively, DC current includes after failure：Steady-state DC electric current after failure, wherein, steady-state DC electric current after failure
Including：Enter the DC current in commutation overlap uncontrollable rectifier stage after DC power distribution line generation failure, i.e., it is straight in the present invention
The condition that stream distribution line back-up protection method carries out steady-state process after DC line fault can realize more preferable protecting effect.
Summary dorsal part equivalent voltage ES, dorsal part equivalent resistance RS, safety factor krelAnd adjust impedance RsetIt can obtain
Know, in step S206 when DC current is more than back-up protection current threshold after failure, enable DC power distribution line back-up protection
Specific determination methods it is as follows：
Wherein, IfDC current after failure in expression DC power distribution line.
In DC power distribution line, DC current I after failurefMeet：
It would know that with reference to above-mentioned two formula, determine DC current I after failurefThe relation between back-up protection current threshold
Parameter be RSWith Rset, wherein, RSObtained according to fault component voltage and fault component Current calculation, RsetThen depend on direct current
The electric property of distribution line.Fault component voltage is produced with fault component electric current with the change of the method for operation of straight-flow system
Change, so that RSNumerical value can also be changed therewith, it is final so that the numerical value of back-up protection current threshold is according to direct current
The method of operation of system is adjusted in real time, to realize that the back-up protection in DC power distribution line under any circumstance can be good
The effect of operation.
By being emulated for the DC power distribution line using the DC power distribution line back-up protection method in the present invention
Processing, would know that RSInclude following characteristic：
1) when DC power distribution line produces positive direction DC line fault：For the rectification side of DC power distribution line, with mistake
Cross resistance CgIncrease, DC current constantly reduces after failure, if its value is also lower than DC current before failure, Δ i becomes negative by positive, goes out
Now reversely, dorsal part equivalent resistance R will be causedSPolarity becomes negative by positive, occurs reverse.For inverter side, current direction before and after failure
On the contrary, Δ i will not be reverse, dorsal part equivalent resistance RSAlways for just, polarity is constant, but with transition resistance CgIncrease, Δ i values subtract
It is small, dorsal part equivalent resistance R will be causedSValue increase, tends towards stability afterwards.
2) when DC power distribution line produces opposite direction DC line fault, for the rectification side of DC power distribution line, failure
The direction of DC current and DC current before failure is on the contrary, Δ i will not be reverse afterwards, dorsal part equivalent resistance RSIt is then negative, pole always
Property is constant.But with transition resistance CgIncrease, Δ i values reduce, and will cause dorsal part equivalent resistance RSValue increase, after tend towards stability.For
Inverter side, DC current and DC current before failure are in the same direction after failure, with transition resistance CgIncrease, DC current is continuous after failure
Reduce, the DC current before less than failure, Δ i is become just by negative, occurs that reversely, dorsal part equivalent resistance R will be causedSBecome just by negative,
Polarity occurs reverse.
By above-mentioned dorsal part equivalent resistance RSCharacteristic would know that, when DC power distribution line produce positive direction DC line fault
When, the back-up protection performance for inverter side is stablized, and then increases for rectification side with transition resistance, it is possible to create external area error
The malfunction of protection；When DC power distribution line produces opposite direction DC line fault, the back-up protection performance for rectification side is steady
It is fixed, and for inverter side then with the increase of trouble point transition resistance, it is possible to create the malfunction of external area error protection.
, need to be by safety factor k to avoid the malfunction of above-mentioned external area error protectionrelNumerical value heighten, but at the same time for avoid can
By coefficient krelNumerical value is excessive and causes back-up protection scope too small, can be by the back-up protection of the DC power distribution line in the present invention
Method is limited in the case of steady-state DC electric current after the failure of DC power distribution line is more than failure presteady state DC current and carries out
Use, effectively to avoid the malfunction that external area error is protected.
In addition, the DC power distribution line back-up protection method in the present invention is taken in the rectification side of DC power distribution line and determines electricity
Pressure and fixed idle control, inverter side, which is taken, determines active power and determines have more good protection in the case of Reactive Power Control
Performance.
Embodiment 2
A kind of DC power distribution line backup protection system for damping is also provided in the present embodiment, and Fig. 6 is according to the embodiment of the present invention
DC power distribution line backup protection system for damping structure diagram, according to Fig. 6, which includes：
Setting module 102；For obtaining the fault component voltage and fault component electricity of any side of DC power distribution line
Stream, back-up protection current threshold is determined according to fault component voltage and fault component electric current, wherein, DC power distribution line it is any
Side includes one below：Rectification side, inverter side；
Measurement module 104；For after DC power distribution line produces failure, measuring direct current after the failure of DC power distribution line
Electric current；
Execution module 106；For when DC current is more than back-up protection current threshold after failure, enabling DC distribution line
Road back-up protection.
Fig. 7 be according to the structure diagram of the setting module of the DC power distribution line backup protection system for damping of the embodiment of the present invention,
According to Fig. 7, which includes：
Fault component unit 1020：For according to DC power distribution line respective side back-up protection installation site in DC distribution
DC voltage before circuit generation failure obtains fault component voltage with the DC voltage after generation failure and is matched somebody with somebody according to direct current
Electric line respective side back-up protection installation site is after the DC current before DC power distribution line produces failure and generation failure
DC current obtains fault component electric current.
Dorsal part equivalent unit 1022：For building the dorsal part equivalent circuit of any side of DC power distribution line, dorsal part is equivalent
DC voltage of the circuit according to DC power distribution line respective side back-up protection installation site before failure is produced or after generation failure
Built with DC current.
Embodiment 3
According to still another embodiment of the invention, a kind of storage medium is also provided, storage medium includes the program of storage, its
In, the method for execution any of the above-described when program is run.
Alternatively, in the present embodiment, above-mentioned storage medium can be configured to the journey that storage is used to perform following steps
Sequence code：
S1, obtains the fault component voltage and fault component electric current of any side of DC power distribution line, according to fault component
Voltage and fault component electric current determine back-up protection current threshold, wherein, any side of DC power distribution line include it is following it
One：Rectification side, inverter side；
S2, after DC power distribution line produces failure, measures DC current after the failure of DC power distribution line；
S3, when DC current is more than back-up protection current threshold after failure, enables DC power distribution line back-up protection.
Alternatively, storage medium is also configured to the program code that storage is used to perform following steps：
S4, according to back-up protection installation site after the DC voltage before DC power distribution line produces failure and generation failure
DC voltage obtain fault component voltage, wherein, back-up protection erecting device is arranged on DC power distribution line；
S5, according to back-up protection installation site after the DC current before DC power distribution line produces failure and generation failure
DC current obtain fault component electric current.
Alternatively, storage medium is also configured to the program code that storage is used to perform following steps：
S6, the dorsal part equivalent circuit of any side of structure DC power distribution line, wherein, dorsal part equivalent circuit includes：Each other
The dorsal part equivalent voltage of series connection and dorsal part equivalent resistance, dorsal part equivalent resistance are obtained according to fault component voltage and fault component electric current
；
S7, back-up protection current threshold is determined according to the dorsal part equivalent circuit of structure.
Alternatively, in the present embodiment, above-mentioned storage medium can include but is not limited to：USB flash disk, read-only storage (Read-
Only Memory, referred to as ROM), it is random access memory (Random Access Memory, referred to as RAM), mobile hard
Disk, magnetic disc or CD etc. are various can be with the medium of store program codes.
The embodiment of the present invention additionally provides a kind of processor, which is used for operation program, wherein, program operation
Step in Shi Zhihang any of the above-described methods.
Alternatively, in the present embodiment, above procedure is used to perform following steps：
S1, obtains the fault component voltage and fault component electric current of any side of DC power distribution line, according to fault component
Voltage determines back-up protection current threshold with fault component electric current, wherein, any side includes one below：Rectification side, inversion
Side；
S2, after DC power distribution line produces failure, measures DC current after the failure of DC power distribution line；
S3, when DC current is more than back-up protection current threshold after failure, enables DC power distribution line back-up protection.
Alternatively, the specific example in the present embodiment may be referred to described in above-described embodiment and optional embodiment
Example, details are not described herein for the present embodiment.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed
Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
Performed in the storage device by computing device, and in some cases, can be with different from shown in order execution herein
The step of going out or describing, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or
Step is fabricated to single integrated circuit module to realize.Combined in this way, the present invention is not restricted to any specific hardware and software.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this area
For art personnel, the invention may be variously modified and varied.All any modifications within the principle of the present invention, made, etc.
With replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
- A kind of 1. DC power distribution line back-up protection method, it is characterised in that including：The fault component voltage and fault component electric current of any side of the DC power distribution line are obtained, according to the fault component Voltage determines back-up protection current threshold with fault component electric current, wherein, any side includes one below：Rectification side, Inverter side；After DC power distribution line produces failure, DC current after the failure of the DC power distribution line is measured；When DC current is more than the back-up protection current threshold after the failure, DC power distribution line back-up protection is enabled.
- 2. the according to the method described in claim 1, it is characterized in that, event for obtaining any side of DC power distribution line Hinder component voltage and fault component electric current, including：According to back-up protection installation site after the DC voltage before the DC power distribution line produces failure and generation failure DC voltage obtains the fault component voltage, wherein, the back-up protection erecting device is arranged on the DC power distribution line On；According to back-up protection installation site after the DC current before the DC power distribution line produces failure and generation failure DC current obtains the fault component electric current.
- It is 3. according to the method described in claim 2, it is characterized in that, true according to the fault component voltage and fault component electric current Determine back-up protection current threshold, including：The dorsal part equivalent circuit of any side of DC power distribution line is built, wherein, the dorsal part equivalent circuit includes：It is one another in series Dorsal part equivalent voltage and dorsal part equivalent resistance, the dorsal part equivalent resistance is according to the fault component voltage and fault component electricity Stream obtains；The back-up protection current threshold is determined according to the dorsal part equivalent circuit of structure.
- 4. according to the method described in claim 3, it is characterized in that, the dorsal part equivalent voltage is obtained according to following object：Root According to DC voltage and DC current of the back-up protection installation site before the DC power distribution line produces failure, or produce failure DC voltage and DC current afterwards, and the dorsal part equivalent resistance.
- 5. according to the method described in claim 3, it is characterized in that, according to the dorsal part equivalent circuit of structure determine it is described after Standby protective current threshold value, including：Obtain the safety factor of DC power distribution line back-up protection.
- 6. according to the method described in claim 3, it is characterized in that, according to the dorsal part equivalent circuit of structure determine it is described after Standby protective current threshold value, including：Obtain the DC power distribution line adjusts impedance.
- 7. method according to any one of claims 1 to 6, it is characterised in that DC current includes after the failure：Failure Steady-state DC electric current afterwards, wherein, steady-state DC electric current includes after the failure：The DC power distribution line enters after producing failure The DC current in commutation overlap uncontrollable rectifier stage.
- A kind of 8. DC power distribution line backup protection system for damping, it is characterised in that including：Setting module；For obtaining the fault component voltage and fault component electric current of any side of the DC power distribution line, Back-up protection current threshold is determined according to the fault component voltage and fault component electric current, wherein, any side includes One below：Rectification side, inverter side；Measurement module；For after DC power distribution line produces failure, measuring direct current after the failure of the DC power distribution line Stream；Execution module；For when DC current is more than the back-up protection current threshold after the failure, enabling DC distribution Line backup protection.
- 9. system according to claim 8, it is characterised in that the setting module includes：Fault component unit：For according to the DC power distribution line respective side back-up protection installation site in the DC distribution DC voltage before circuit generation failure obtains the fault component voltage and according to institute with the DC voltage after generation failure State DC power distribution line respective side back-up protection installation site the DC power distribution line produce failure before DC current with Produce the DC current after failure and obtain the fault component electric current.Dorsal part equivalent unit：For building the dorsal part equivalent circuit of any side of DC power distribution line, the dorsal part equivalent circuit DC voltage according to the DC power distribution line respective side back-up protection installation site before failure is produced or after generation failure Built with DC current.
- A kind of 10. storage medium, it is characterised in that the storage medium includes the program of storage, wherein, when described program is run Method any one of perform claim requirement 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711213599.7A CN107994552B (en) | 2017-11-27 | 2017-11-27 | DC power distribution line back-up protection method and system, storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711213599.7A CN107994552B (en) | 2017-11-27 | 2017-11-27 | DC power distribution line back-up protection method and system, storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107994552A true CN107994552A (en) | 2018-05-04 |
| CN107994552B CN107994552B (en) | 2019-08-09 |
Family
ID=62033593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711213599.7A Active CN107994552B (en) | 2017-11-27 | 2017-11-27 | DC power distribution line back-up protection method and system, storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107994552B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220116075A1 (en) * | 2020-10-08 | 2022-04-14 | Melexis Technologies Nv | Transmitter for power line communication |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255290A (en) * | 2011-06-27 | 2011-11-23 | 华北电力大学 | Current adaptive protecting method |
| CN103474949A (en) * | 2013-08-07 | 2013-12-25 | 南京因泰莱配电自动化设备有限公司 | Self-adaptive three-sectional protection setting method and device |
| WO2016074199A1 (en) * | 2014-11-13 | 2016-05-19 | Abb Technology Ltd | Dc grid protection method and system thereof |
| CN106684834A (en) * | 2015-11-10 | 2017-05-17 | 中国电力科学研究院 | Adaptive current protection system and method for power distribution network |
-
2017
- 2017-11-27 CN CN201711213599.7A patent/CN107994552B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255290A (en) * | 2011-06-27 | 2011-11-23 | 华北电力大学 | Current adaptive protecting method |
| CN103474949A (en) * | 2013-08-07 | 2013-12-25 | 南京因泰莱配电自动化设备有限公司 | Self-adaptive three-sectional protection setting method and device |
| WO2016074199A1 (en) * | 2014-11-13 | 2016-05-19 | Abb Technology Ltd | Dc grid protection method and system thereof |
| CN106684834A (en) * | 2015-11-10 | 2017-05-17 | 中国电力科学研究院 | Adaptive current protection system and method for power distribution network |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220116075A1 (en) * | 2020-10-08 | 2022-04-14 | Melexis Technologies Nv | Transmitter for power line communication |
| US11552677B2 (en) * | 2020-10-08 | 2023-01-10 | Melexis Technologies Nv | Transmitter for power line communication |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107994552B (en) | 2019-08-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103094905B (en) | Selection method of dynamic reactive power compensation configuration point | |
| CN103279639B (en) | Receiving end Network Voltage Stability overall process Situation Assessment based on response and preventing control method | |
| Meegahapola et al. | Characterisation of large disturbance rotor angle and voltage stability in interconnected power networks with distributed wind generation | |
| CN103500261B (en) | Method for fault simulation of direct | |
| CN109245058B (en) | UPFC-containing power transmission line rapid distance protection method and device | |
| CN102121966B (en) | Measuring method and analytical system for low-voltage ride through capability of wind driven generator | |
| CN106684834B (en) | A kind of power distribution network adaptive Current Protection system and method | |
| CN105021943B (en) | The overcurrent detection method and system of MMC HVDC AC failures | |
| WO2021253368A1 (en) | Coordinated control system and method of wind turbine and statcom for suppressing unbalanced voltage in dispersed wind farm | |
| CN105762777A (en) | Pilot protection method containing multi-T-connection inverter interfaced distributed generation power distribution network | |
| Prada et al. | Voltage stability assessment for real-time operation | |
| Modarresi et al. | New adaptive and centralised under‐voltage load shedding to prevent short‐term voltage instability | |
| CN109581116A (en) | A kind of method and apparatus detecting distribution network failure | |
| CN110445170A (en) | A kind of active power and frequency control method and system of the soft direct join net of marine wind electric field | |
| Wang et al. | A novel hybrid directional comparison pilot protection scheme for the LCC-VSC hybrid HVDC transmission lines | |
| Dave et al. | Incorporating DC grid protection, frequency stability and reliability into offshore DC grid planning | |
| CN109327037A (en) | A kind of layer-specific access direct-current commutation failure prevention and control setting method and device | |
| CN110445171A (en) | A kind of active power and frequency control method and system based on the soft lineal system of marine wind electric field | |
| CN107994552A (en) | DC power distribution line back-up protection method and system, storage medium | |
| CN109066621A (en) | A kind of fault current calculation method, system and the equipment of active power distribution network | |
| Hazra et al. | HVDC control strategies to improve transient stability in interconnected power systems | |
| CN113659548B (en) | Power distribution network pilot protection method and system based on positive sequence fault component energy direction | |
| CN109541399A (en) | A kind of electrical power distribution network fault location method and device | |
| Lin et al. | Coordinated power control strategy of voltage source converter‐based multiterminal high‐voltage direct current based on the voltage‐current curve | |
| Wang et al. | Power transmission paths based voltage stability assessment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |