CN108777476B - A kind of locality protection method of the access of distributed generation resource containing inverter type power distribution network - Google Patents
A kind of locality protection method of the access of distributed generation resource containing inverter type power distribution network Download PDFInfo
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- CN108777476B CN108777476B CN201810670271.6A CN201810670271A CN108777476B CN 108777476 B CN108777476 B CN 108777476B CN 201810670271 A CN201810670271 A CN 201810670271A CN 108777476 B CN108777476 B CN 108777476B
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- 230000004224 protection Effects 0.000 title claims abstract description 262
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000011065 in-situ storage Methods 0.000 claims abstract description 128
- 230000035945 sensitivity Effects 0.000 claims abstract description 7
- 230000001133 acceleration Effects 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims description 24
- 230000004888 barrier function Effects 0.000 claims description 6
- 241000287196 Asthenes Species 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 2
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- 238000005259 measurement Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
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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
- H02H7/28—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 meshed systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- H02J3/383—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The present invention relates to a kind of locality protection methods that can be used for the access power distribution network of distributed generation resource containing inverter type.In the power distribution network of the access of distributed generation resource containing inverter type, step protection is difficult to reliably detect failure, exists simultaneously the long problem of fault clearing time.The present invention proposes that in-situ protection is made of the directional current protection of low-voltage lockout, and definite value according to when guaranteeing that line end where protecting breaks down there is enough sensitivity to be adjusted.Under fault condition, the starting information and fault direction information of in-situ protection within the scope of locality protection collecting zone successively execute locality protection logic criterion.In-situ protection actuation time can be adaptively adjusted in locality protection method, reinforce the cooperation between protection while acceleration disturbance is cut off.The present invention improves the selectivity, sensitivity and quick-action of guard method, while enhancing the fault-tolerant ability of guard method using the Redundanter schalter amount information in regional scope.
Description
Technical field
The invention belongs to technical field of power systems, and in particular to one kind can be used for the access of distributed generation resource containing inverter type
The locality protection method of power distribution network.
Background technique
After extensive inverter type distributed generation resource access, power distribution network usually has more flexible control ability, can be with
Operate in networking or island mode.And when power distribution network operates under island mode, the fault current levels of power distribution network are low, make
Failure cannot be reliably detected by obtaining traditional guard method for being based only upon current measurement information.To promote the sensitive of fault detection
Degree, can increase the local measurements information such as voltage, impedance on the basis of conventional current guard method.However, based on local letter
Protection (hereinafter referred to as in-situ protection) principle of breath, line end where cannot accurately identifying protection break down or adjacent
Route head end breaks down, and can only guarantee selectivity by complicated setting value order, to increase fault clearing time, no
Conducive to the stability for maintaining distribution network system and inverter type distributed generation resource.Therefore, further under research communications assistance containing inverse
The fast protection method for becoming type distributed generation resource access power distribution network is of great significance.
In the guard method under existing most of communication cooperations, protection system is able to maintain that selectivity, reliability and speed
The precondition of dynamic property is that communication system and in-situ protection device are in normal operating conditions: being wherein based on analog quantity information
Shared guard method requires the synchronized sampling and real-time exchange of information high, reply communication or sampling apparatus abnormal state
Ability it is poor；The another kind of guard method based on switching value information sharing, such as widely applied Unit protection and enclosed type
Guard method cannot equally cope with communication link or in-situ protection event although the synchronization and bandwidth requirement to communication system are low
Barrier.
In view of the practical power distribution network physics complicated as one-network coupled system, by artificial O&M, burst fire-disaster etc.
Factor influences, single communication link or in-situ protection plant failure and lead to loss of data, transmission unsuccessfully etc. uncertain factors be wide
General presence.Therefore, the fault-tolerant ability that how research enhances distribution protection method under communication cooperates also is of great significance.
Summary of the invention
It is an object of the invention to be directed in the power distribution network of the access of distributed generation resource containing inverter type, stage in-situ protection
Staged definite value can only be relied on to guarantee selectivity, there is a problem of that fault clearing time is long, proposed a kind of new based on low
The locality protection method of voltage blocking directional current protection.In case of a fault, locality protection is collected in regional scope on the spot
Protection starting information executes locality protection failure criterion, and the adaptive actuation time for adjusting current protection accelerates failure removal speed
Enhance the cooperation between in-situ protection while spending.This method efficiently uses multiple spot redundancy, realizes certain appearance
Wrong ability can cope with the complex situations such as section communication link failure or protective device failure, further enhance guard method
Reliability.
The technical solution of the present invention is as follows:
In-situ protection uses the directional current protection of low-voltage lockout, and current ration therein is online to its institute according to protection
When road end is broken down there is enough sensitivity to be adjusted, low-voltage definite value is according to kU-SetVoltage rating again carries out whole
Fixed, time definite value is fixed as t0.Malfunction directional element can reduce the cooperation difficulty of in-situ protection；Current ration is only according to sensitive
Degree is adjusted, and low-voltage definite value and time definite value are set as fixed value, and tuning process obtains a degree of simplification；Only when
Failure occurs in in-situ protection positive direction predetermined, and when lower voltage components and overcurrent element all start, on the spot
Protection can just issue enabling signal.
The fixed value calculation of in-situ protection has obtained largely simplifying in power distribution network, and the electric current for not needing to carry out complexity is fixed
Value and the cooperation of staged time definite value；The in-situ protection definite value being calculated centainly meets sensitivity requirements, can guarantee that failure is sent out
In-situ protection can reliably start in raw situation.
In order to promote the comprehensive performance of distribution protection method, accelerates fault identification speed, reduce trouble duration, contracting
Glitch power loss range, the method for the present invention is it is further proposed that utilize the multiple spot Redundanter schalter amount information structure in power distribution network regional scope
Build locality protection method.The locality protection method of building is according to the relative position of in-situ protection, it may be predetermined that area information
Range.Each in-situ protection can become the center of locality protection, and up and down grade is expanded since the central point, including
The downstream of in-situ protection of interest, upstream, opposite side in-situ protection.When the power distribution network method of operation changes, locality protection side
Method can also adaptively update the relationship of locality protection and in-situ protection；Since the protective switch amount information of regional scope includes
The fault message of a large amount of mutually redundancies, can rationally promote the error resilience performance of guard method using these Redundanter schalter amount information.
The method of the present invention it is further proposed that the power distribution network based on multiple spot Redundanter schalter amount information in power distribution network regional scope
Locality protection method is specifically:
Multiple spot Redundanter schalter amount information within the scope of collecting zone；Specifically: for matching comprising M region protection unit
Power grid, M region protection unit in the middle will independently be run, if any one region protection unit detects that switching value is believed
Breath changes, then executes power distribution network locality protection logic criterion described in step 3 respectively；Wherein, " region " range refer to by
Bus nodes where protection of interest and the bus nodes for being equipped with in-situ protection being directly adjacent to the node collectively form
Range；It include the protection enabling signal and fault direction letter that in-situ protection provides using the switching value information in regional scope
Breath；By taking in-situ protection R as an example, the starting of in-situ protection means that its under-voltage protection element and overcurrent protection element all start,
And its malfunction directional element indicates that fault direction is positive direction, then locality protection is thought within the scope of the positive direction of in-situ protection R
Faulty generation is usedIt indicates；The positive direction of in-situ protection is defined as, from the bus section nearest apart from the in-situ protection
Point is directed toward the route where protection.
When an error occurs, M region protection unit will be in its regional scope, and sequence executes distribution web area and protects respectively
Protect logic criterion, the cooperation between Lai Zengqiang in-situ protection；Using following four kinds of logic criterions, the judgement of Lai Jinhang fault element and guarantor
Shield acts decision, specifically:
(1) internal fault accelerates criterion:
This criterion indicates, if the in-situ protection (labeled as S (i) and C (i)) at certain route both ends starts, is denoted asThen the region protection unit where two side bus of route all will confirm that in this route
Portion's failure sends instantaneous tripping order to the corresponding breaker of in-situ protection S (i) and C (i).
(2) external fault locking criterion:
This criterion indicates, equal if there is in-situ protection S (i) and its j-th strip junior route in-situ protection L (i, j)
Starting, is denoted asShow faulty within the scope of positive direction, then bus pair where S (i)
The region protection unit answered will confirm that failure occurs except this route, by the time definite value of in-situ protection S (i) in default value t0
On the basis of increase a time differential Δ t.
(3) the fault-tolerant acceleration criterion of internal fault:
This criterion indicates, starts if there is in-situ protection S (i), is denoted asShow S (i) positive direction
Failure；And its all junior's route in-situ protection L (i, j) do not start, are denoted asShow
Junior's route does not detect positive direction failure；At the same time, since in-situ protection C (i) breaks down or communication link
It breaks down, locality protection cannot normally be collected into the related switch amount information of in-situ protection C (i), it is denoted as Γ (C (i))=1,
Then the corresponding region protection unit of bus where S (i) will confirm that the line-internal where protecting S (i) and C (i) occurs for failure, to
The corresponding breaker of in-situ protection S (i) and C (i) sends instantaneous tripping order.
(4) the fault-tolerant locking criterion of external fault:
This criterion indicates, starts if there is in-situ protection S (i), is denoted asShow S (i) positive direction
Failure；And its opposite side in-situ protection C (i) does not start, and is denoted asAt the same time, in-situ protection S (i)
Junior's route in, break down there are in-situ protection L (i, j) or communication link break down, locality protection cannot be normal
It is collected into the relevant information of in-situ protection L (i, j), is denoted asThe then corresponding region of bus where S (i)
Protection location will confirm that failure occurs that outside route, the time definite value of in-situ protection S (i) is being existed where protection S (i) and C (i)
Default value t0On the basis of increase a time differential Δ t.
Power distribution network locality protection method proposed by the present invention can be divided into two parts, be to have adaptive definite value just respectively
Ground protection, and the region protection unit based on the effective use of multiple spot redundancy.In-situ protection is power distribution network locality protection
Basis, under nonserviceabling, the fault direction information and enabling signal of in-situ protection will be total in regional scope predetermined
It enjoys, provides the switching value information of multiple spot redundancy for locality protection；Region protection unit is the key that realize power distribution network locality protection,
The enabling signal of in-situ protection and fault direction information are shared by exchange in regional scope, and sequence executes locality protection logic and sentences
According to carrying out the identification and protection act decision of fault element；The two cooperation enhances the performance of guard method, including improves and match
The electric network fault mute time reduces failure power loss range, and enhancing fault-tolerant ability.
Detailed description of the invention
Explicit embodiment of the invention is described below with reference to attached drawing, in which:
Fig. 1 is the protection element composition schematic diagram that in-situ protection of the present invention uses；
Fig. 2 is that locality protection logic criterion of the present invention executes schematic diagram；
Fig. 3 is the power distribution network typical fault position view as the preferred embodiment of the present invention.
Specific embodiment
Locality protection method of the present invention for the access power distribution network of distributed generation resource containing inverter type, including power distribution network is on the spot
Relaying configuration and adjusting and the locality protection based on multiple spot Redundanter schalter amount information in regional scope, below in conjunction with attached drawing to this hair
It is bright to be described further.
The technical solution of the present invention is as follows:
Referring to Fig.1, in power distribution network locality protection method proposed by the present invention, in-situ protection uses the direction of low-voltage lockout
Current protection when current ration therein breaks down to line end where it according to protection there is enough sensitivity to carry out
Adjusting, low-voltage definite value is according to kU-Set=0.5 times of voltage rating is adjusted, and time definite value is fixed as t0=0.1s.Failure
Directional element can reduce the cooperation difficulty of in-situ protection；Current ration is only adjusted according to sensitivity, low-voltage definite value and
Time definite value is set as fixed value, and tuning process obtains a degree of simplification；Only when failure generation is preparatory in in-situ protection
In the positive direction of definition, and when lower voltage components and overcurrent element all start, in-situ protection can just issue enabling signal.
Further, referring to Fig. 2, the power distribution network locality protection based on multiple spot Redundanter schalter amount information in regional scope is provided
Method:
Multiple spot Redundanter schalter amount information within the scope of collecting zone；Specifically: for matching comprising M region protection unit
Power grid, M region protection unit in the middle will independently be run, if any one region protection unit detects that switching value is believed
Breath changes, then executes power distribution network locality protection logic criterion described in step 3 respectively；Wherein, " region " range is by being closed
The model that bus nodes and the bus nodes for being equipped with in-situ protection being directly adjacent to the node where note protection collectively form
It encloses；It include the protection enabling signal and fault direction information that in-situ protection provides using the switching value information in regional scope；
By taking in-situ protection R as an example, the starting of in-situ protection means that its under-voltage protection element and overcurrent protection element all start, and
Its malfunction directional element indicates that fault direction is positive direction, then locality protection think to have within the scope of the positive direction of in-situ protection R therefore
Barrier occurs, and usesIt indicates；The positive direction of in-situ protection is defined as, and is referred to from the bus nodes nearest apart from the in-situ protection
Route to where protection.
When an error occurs, M region protection unit will be in its regional scope, and referring to Fig. 2, sequence executes distribution respectively
Web area relay protective scheme criterion, the cooperation between Lai Zengqiang in-situ protection；Using following four kinds of logic criterions, Lai Jinhang fault element
Judgement and protection act decision, specifically:
(1) internal fault accelerates criterion:
This criterion indicates, if the in-situ protection (labeled as S (i) and C (i)) at certain route both ends starts, is denoted asThen the region protection unit where two side bus of route all will confirm that in this route
Portion's failure sends instantaneous tripping order to the corresponding breaker of in-situ protection S (i) and C (i).
(2) external fault locking criterion:
This criterion indicates, equal if there is in-situ protection S (i) and its j-th strip junior route in-situ protection L (i, j)
Starting, is denoted asShow faulty within the scope of positive direction, then bus pair where S (i)
The region protection unit answered will confirm that failure occurs except this route, by the time definite value of in-situ protection S (i) in default value t0
On the basis of increase a time differential Δ t=0.2s.
(3) the fault-tolerant acceleration criterion of internal fault:
This criterion indicates, starts if there is in-situ protection S (i), is denoted asShow S (i) positive direction
Failure；And its all junior's route in-situ protection L (i, j) do not start, are denoted asShow
Junior's route does not detect positive direction failure；At the same time, since in-situ protection C (i) breaks down or communication link
It breaks down, locality protection cannot normally be collected into the related switch amount information of in-situ protection C (i), it is denoted as Γ (C (i))=1,
Then the corresponding region protection unit of bus where S (i) will confirm that the line-internal where protecting S (i) and C (i) occurs for failure, to
The corresponding breaker of in-situ protection S (i) and C (i) sends instantaneous tripping order.
(4) the fault-tolerant locking criterion of external fault:
This criterion indicates, starts if there is in-situ protection S (i), is denoted asShow S (i) positive direction
Failure；And its opposite side in-situ protection C (i) does not start, and is denoted asAt the same time, in-situ protection S (i)
Junior's route in, break down there are in-situ protection L (i, j) or communication link break down, locality protection cannot be normal
It is collected into the relevant information of in-situ protection L (i, j), is denoted asThe then corresponding region of bus where S (i)
Protection location will confirm that failure occurs that outside route, the time definite value of in-situ protection S (i) is being existed where protection S (i) and C (i)
Default value t0On the basis of increase a time differential Δ t=0.2s.
In a preferred embodiment of the invention, the power distribution network of the access of the distributed generation resource containing inverter type referring to shown in Fig. 3, should
Power distribution network operates in island mode, and the inverter type accumulation power supply of 0.4MW, the inverter type No.1 light of 1MW have been accessed in system
Lie prostrate power supply, No. two photo-voltaic power supplies of inverter type of 1MW and the rotary-type power supply of 0.6MW.According to it is proposed by the present invention configuration with
Setting method configures power distribution network in-situ protection, and under analyzing typical fault in power distribution network a situation arises, power distribution network locality protection
Action situation:
1. in-situ protection and communication link fault-free
When route midpoint between bus 834 and 860 being set A phase metallicity failure f1 alternate with B phase occur, in-situ protection
{ R2, R4, R6, R7, R9, R12 and R14 } detects the faulty generation in its positive area.According to the internal fault of locality protection
Accelerate criterion, the region protection unit at bus 834 and 860 will be issued instantaneously to the corresponding breaker of in-situ protection R6 and R7 and be jumped
Lock order；Meanwhile according to external fault locking criterion, the time definite value of in-situ protection { R2, R4, R9, R12 and R14 } will be from admittedly
There is delay t0=0.1s increases to 0.3s, to reinforce the cooperation between in-situ protection.When all in-situ protections and communication system
It all works normally, the locality protection method proposed and traditional blocking protection method can instantaneous isolated faults.
2. in-situ protection plant failure or its signal are lost in transmission process
Identical failure f1 occurs for the route midpoint between in-situ protection R6 and R7, at the same time, it is assumed that in-situ protection
R6 fails to detect that failure f1 or R6 detect f1 but its signal is lost in transmission process due to safeguarding improper,
And fail to upload to RAPS.In this case, from locality protection, the in-situ protection set of starting become R2, R4, R7,
R9, R12 and R14 }.By taking the region protection unit on 860 nodes as an example, in-situ protection R7 is labeled as S (1), and in-situ protection
R5 and R13 is then accordingly expressed as L (1,1), L (1,2).In this case, although the region protection unit on 860 nodes not
The information that in-situ protection R6 (labeled as C (1)) can be got, that is, have Γ (C (1))=1, but locality protection can collect region
Other switching value information in range, find R (L (1,1))=R (L (1,2))=0, it means that S (1) downstream it is all on the spot
Protection does not all detect failure within the scope of positive direction, the fault-tolerant acceleration criterion of internal fault is met, therefore, on 860 nodes
Region protection unit sends instantaneous tripping instruction to the corresponding breaker of in-situ protection R6 and R7.In addition, being closed according to external fault
Criterion is locked, the time definite value of in-situ protection { R2, R9 and R12 } will be from inherent delay t0=0.1s increases to 0.3s；According to outside
Failure tolerant locking criterion, the time delay of in-situ protection R4 and R14 will also increase a time differential Δ t=0.2s.In area
Under the coordination of domain protection, each in-situ protection still cooperates；In contrast, due to the loss of block signal, tradition locking
Formula guard method will lose coordination, and the first row in table 1 compares power distribution network locality protection and traditional blocking protection method exists
In this case protection act result.
3. the communication link fails between bus nodes
Identical failure f1 is arranged in route midpoint between in-situ protection R6 and R7, and consider 834 and 860 nodes it
Between communication link it is unavailable due to physical damage.Since information transfer channel interrupts, in this case, internal fault adds
Speed excision criterion is not able to satisfy, and event cannot be instantaneously isolated in traditional blocking protection method and power distribution network locality protection method
Barrier, in-situ protection R6 and R7 will be in the time delay t of default0Trip operation is executed after=0.1s.It is latched based on external fault
Criterion, power distribution network locality protection can adaptively increase the time definite value of back-up protection on the spot { R2, R4, R9, R12 and R14 }, will
It is from inherent delay t0=0.1s increases to 0.3s, further ensures the selectivity of in-situ protection in this way.The second row in table 1
It compares under this communication failure condition, the performance of power distribution network locality protection method and traditional blocking protection method.
1 bus-bar fault of table simplifies in-situ protection and station domain protecting method verification result
4. fault-tolerant ability test example summarizes
Identical failure f1 occurs for the route midpoint between in-situ protection R6 and R7, at the same time, three typical positions
(f1, f2, f3) setting three-phase metallic fault is set, tests locality protection proposed by the present invention under a variety of ideal and non-ideal conditions
Method, and evaluate its result of the action.The non-ideal condition of setting is primarily referred to as, the guarantor on the spot on fault element or non-faulting element
Communication link between protection unit dysfunction and guilty culprit route or failure adjacent lines two sides endpoint disconnects.Distribution
The performance and fault-tolerant ability of barrier domain protecting method are verified under more comprehensively non-ideality.
Table 2 summarizes in-situ protection { R4, R5, R6, R7, R8, R9, R13 and R14 } at f1, f2 and f3 fault condition, examines
Consider the result of the action under different in-situ protections and communication link state: bracket " [] " illustrates the in-situ protection institute in bracket
Corresponding breaker can preferentially trip, and the selectivity of protection is realized in the isolated fault in minimum zone.
The fault-tolerant ability test result of 2 locality protection of table
The result shows that a kind of region that can be used for the access power distribution network of distributed generation resource containing inverter type of the present invention is protected
While maintaining method improves protection speed and selection performance, the fault-tolerant ability of protection is enhanced: in all ideal or unreasonablys
In the case of thinking, the locality protection method proposed can guarantee selectivity, that is, ensure that the smallest failure power loss range；The party
Method can resist the case where single communication link failure or in-situ protection failure, in addition to the communication of faulty line both ends parallel connection
It, can instantaneous isolated fault under link disconnection.
The preferred embodiment of the present invention is only to be painted to be used, and is not the limitation to technical method of the invention, the present invention
Technical spirit be covered by the technology contents that appended claims of the present invention are advocated.
Claims (1)
1. a kind of locality protection method of the access of distributed generation resource containing inverter type power distribution network, it is characterised in that:
According to the relative position of in-situ protection, regional scope is determined, each in-situ protection can become the center of locality protection, from
The central point starts up and down grade and expands, downstream, upstream, opposite side in-situ protection including in-situ protection of interest；
Multiple spot Redundanter schalter amount information within the scope of collecting zone, for the power distribution network comprising M region protection unit, in the middle
M region protection unit will independently be run, if any one region protection unit detects that switching value information changes,
Then sequence executes power distribution network locality protection logic criterion respectively；The regional scope is the bus nodes where protection of interest
And the range that the bus nodes for being equipped with in-situ protection being directly adjacent to the node collectively form；Using in regional scope
Switching value information includes the protection enabling signal and fault direction information that in-situ protection provides；
The in-situ protection uses the directional current protection of low-voltage lockout, and current ration therein is according to protection to where it
When breaking down in line end there is enough sensitivity to be adjusted, low-voltage definite value is carried out according to the multiple of voltage rating
Adjusting, time definite value are fixed as t0；Only when failure occur in the positive direction that in-situ protection defines, and lower voltage components and
When overcurrent element all starts, in-situ protection just issues protection enabling signal, and the positive direction refers to apart from the in-situ protection
Nearest bus nodes are directed toward the route where protection；
The power distribution network locality protection logic criterion is specifically:
(1) internal fault accelerates criterion:
This criterion indicates, if the in-situ protection at certain route both ends is that S (i) and C (i) start, is denoted asThen the region protection unit where two side bus of route all will confirm that in this route
Portion's failure sends instantaneous tripping order to the corresponding breaker of in-situ protection S (i) and C (i)；
(2) external fault locking criterion:
This criterion indicates, starts if there is in-situ protection S (i) and its j-th strip junior route in-situ protection L (i, j),
It is denoted asShow faulty within the scope of positive direction, the then corresponding area of bus where S (i)
Domain protection location will confirm that failure occurs except this route, by the time definite value of in-situ protection S (i) in default value t0On the basis of
Increase a time differential Δ t；
(3) the fault-tolerant acceleration criterion of internal fault:
This criterion indicates, starts if there is in-situ protection S (i), is denoted asShow the event of S (i) positive direction
Barrier；And its all junior's route in-situ protection L (i, j) do not start, are denoted asUnder showing
Grade route does not detect positive direction failure；At the same time, since in-situ protection C (i) breaks down or communication link hair
Raw failure, locality protection cannot normally be collected into the related switch amount information of in-situ protection C (i), be denoted as Г (C (i))=1, then S
(i) the corresponding region protection unit of bus where will confirm that failure occurs in line-internal where protection S (i) and C (i), to just
S (i) and the corresponding breaker of C (i) is protected to send instantaneous tripping order in ground；
(4) the fault-tolerant locking criterion of external fault:
This criterion indicates, starts if there is in-situ protection S (i), is denoted asShow the event of S (i) positive direction
Barrier；And its opposite side in-situ protection C (i) does not start, and is denoted asAt the same time, in-situ protection S (i)
It in junior's route, breaks down there are in-situ protection L (i, j) or communication link breaks down, locality protection cannot be received normally
The relevant information for collecting in-situ protection L (i, j), is denoted asThen the corresponding region of bus where S (i) is protected
Shield unit will confirm that failure occurs outside protection S (i) and the place C (i) route, by the time definite value of in-situ protection S (i) silent
Recognize value t0On the basis of increase a time differential Δ t.
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| JPH099496A (en) * | 1995-06-23 | 1997-01-10 | Takaoka Electric Mfg Co Ltd | Spot network receiving and transforming apparatus |
| CN107482595A (en) * | 2017-07-26 | 2017-12-15 | 许继集团有限公司 | A kind of power distribution network in-situ protection and the fitting method and its system of locality protection |
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|---|---|---|---|---|
| JPH099496A (en) * | 1995-06-23 | 1997-01-10 | Takaoka Electric Mfg Co Ltd | Spot network receiving and transforming apparatus |
| CN107482595A (en) * | 2017-07-26 | 2017-12-15 | 许继集团有限公司 | A kind of power distribution network in-situ protection and the fitting method and its system of locality protection |
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