CN104901292A - Power distribution network current protection system and method - Google Patents
Power distribution network current protection system and method Download PDFInfo
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- CN104901292A CN104901292A CN201510337303.7A CN201510337303A CN104901292A CN 104901292 A CN104901292 A CN 104901292A CN 201510337303 A CN201510337303 A CN 201510337303A CN 104901292 A CN104901292 A CN 104901292A
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Abstract
The invention provides a power distribution network current protection system and method. The system comprises a fault data acquisition module, a local protection module, a neighborhood information interaction module and a fault identification module, wherein the fault data acquisition module is used for collecting fault current information at protection installation positions on a feeder line and of a load switch in case of faults; the local protection module is used for determining whether local overcurrent protection acts; the neighborhood information interaction module is used for collecting protection motion information of higher and lower levels of protection and back side protection, and breaker motion information, and converting fault current information of the load switch into III segment overcurrent protection motion information; the fault identification module is used for composing information obtained by the neighborhood information interaction module to form a protection motion criteria to eliminate faults. The power distribution network current protection system and method can solve the problem of protection failure when a distributed generator (DG) is accessed to a power distribution network, meanwhile reduce a black out range caused by faults, and ensure DG continuous power supply.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, particularly relate to power distribution network current protection technology.
Background technology
China's most distribution system in town and country is still based on radial chain structure, and the network of this structure has many advantages, and such as wiring is reliable, protection seting is easy, dilatation is simple.But along with the continuous propelling of intelligent grid pace of construction, the a large amount of feed-in of new forms of energy, distributed power source (Distributed Generator, and the access of microgrid DG), network reconfiguration and self-regulation technology day crescent benefit, China's distribution net work structure is day by day complicated, and operational mode is also more flexible and changeable.
Under this new situation, traditional power distribution network relaying protection has been difficult to adapt to so complicated electric network composition and changeable operational mode, and its matching principle and work of adjusting also become more complicated and difficult, are mainly reflected in the following aspects.
1) enforcement of power distribution network reconfiguration and self-regulation technology; make Complicated Distribution Network more changeable relative to conventional electrical distribution network operation mode; also there is the topological form such as the multi-joint network of many segmentations, ring connection; this makes three-step charging conventional in traditional distribution be difficult to clear and definite protection range; cooperatively interact between protection also more complicated, the problem such as backup protection time delay simultaneously also can be caused long.
2), after distributed power source access power distribution network, the distribution of the trend of power distribution network and short-circuit current level is made to there occurs larger change.The different running statuses of distributed power source may cause the direction of tide of higher level's circuit to change, and cause the misoperation of higher level's route protection; The introducing of distributed power source changes the short-circuit current level of node near distributed power source; when fault occurs because helping of distributed power source increases or shunting action; the fault current flowing through protective device may increase or reduce; it will change protection range and the sensitivity of protection; make protection likely lose selectivity, coordinate also to the superior and the subordinate of each circuit relay protection and bring problem.
In prior art, the associated solutions of power distribution network relaying protection is comprised: the power distribution network multi-stage protection differential based on the time coordinates, based on the power distribution network multi-stage protection cooperation of one-sided information and the mode of the two combination.Front a kind of fit system needs the long period to excise fault, possible influential system power supply safety when backbone fault; Easily there is the phenomenon of overstep tripping in the latter.
Summary of the invention
In view of this; object of the present invention be intended to overcome distribution protection scheme backup protection time delay in prior art compared with long, power failure range large, the problem of false protection and tripping; propose a kind of power distribution network current protection system and method, decrease fault outage scope and guarantee distributed power source continued power.
In order to realize this object, the technical scheme that the present invention takes is as follows:
A kind of power distribution network current protection system, described system comprises the failure data acquisition module connected successively, local protection module, neighborhood information interactive module and Fault Identification module, wherein,
The information of collection, for gathering fault current information feeder line being protected installation place and on-load switch after a failure, is sent to local protection module by failure data acquisition module;
Local protection module is used for judging the whether action of local overcurrent protection according to fault current information, and the fault current information of protection act information, on-load switch is sent to neighborhood information interactive module;
On-load switch fault current information for gathering the superior and the subordinate's protection, the protection act information of back side protection and breaker actuation information, and is converted into III section overcurrent protection action message by neighborhood information interactive module;
Fault Identification module is used for information composition protection act criterion neighborhood information interactive module obtained, excision fault.
Wherein said local protection module comprises forward protection module and reverse protection module, wherein,
Three grades of differential overcurrent protections that forward protection module is made up of outlet switch, two backbone switches that can realize Graded coordination are formed;
Reverse protection module is made up of the distributed power source upstream switch of feeder terminal, the differential overcurrent protection of upstream switch secondary that can realize Graded coordination.
Overcurrent protection and the nearer subscriber switch time delay of outlet switch and backbone switch are the differential overcurrent protection of III section overcurrent protection self-assembling formation secondary of zero second
And described forward protection module is configured to: feeder terminal protection is protected as the third level; configuration time delay is the III section overcurrent protection of zero second; switch in the middle of backbone is protected as the second level; configuration time delay is the III section overcurrent protection of the first time delay; outlet switch is protected as the first order, the I section overcurrent protection of configuration time delay to be the III section overcurrent protection of the second time delay and time delay be the 3rd time delay.
And described reverse protection block configuration is: the distributed power source upstream switch of feeder line head end is protected as the second level; configuration time delay is the III section overcurrent protection of the 4th time delay; the distributed power source upstream switch of feeder terminal is protected as the first order, the I section overcurrent protection of configuration time delay to be the III section overcurrent protection of the 5th time delay and time delay be the 6th time delay.
The protection act criterion of described Fault Identification module composition comprises protection accelerated motion criterion, and described protection accelerated motion criterion is:
Work as S
1+ S
2+ S
3action during >0,
Work as S
1+ S
2+ S
3be failure to actuate when=0,
Work as S
1+ S
2+ S
3locking during <0, wherein,
S
1, S
2, S
3represent criterion one, two, three,
A represents overcurrent protection outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript 0 represents the protection paid close attention to,
Subscript C represents that offside is protected,
Subscript D represents back side protection,
Subscript L represents that subordinate protects,
Subscript 0B represent pay close attention to protection branched line protection,
Subscript LB represents the branched line protection of subordinate's circuit.
The protection act criterion of described Fault Identification module composition comprises breaker fail protection criterion, and described breaker fail protection criterion is:
the branched line overcurrent protection outlet action of subordinate's circuit, when circuit breaker is failure to actuate, accelerates tripping circuit breakers,
subordinate's circuit overcurrent protection outlet action, when circuit breaker is failure to actuate, accelerates tripping circuit breakers,
Wherein A represents overcurrent protection outlet action,
B represents circuit breaker outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript L represents that subordinate protects,
Subscript LB represents the branched line protection of subordinate's circuit.
A kind of power distribution network current protection method, described method comprises step:
A, after a failure collection feeder line protect the fault current information of installation place and on-load switch;
B, to judge the whether action of local overcurrent protection according to fault current information;
The protection act information of C, the protection of collection the superior and the subordinate, back side protection and breaker actuation information;
D, the superior and the subordinate are protected, the protection act information of back side protection and breaker actuation information composition protection act criterion, excision fault.
In the step B of described method, judge whether action comprises forward protection and reverse protection to local overcurrent protection according to fault current information, wherein,
Forward protection is: utilize feeder terminal protection to protect as the third level, configuration time delay is the III section overcurrent protection of zero second, the switch in the middle of backbone is utilized to protect as the second level, configuration time delay is the III section overcurrent protection of the first time delay, outlet switch is utilized to protect as the first order, the I section overcurrent protection of configuration time delay to be the III section overcurrent protection of the second time delay and time delay be the 3rd time delay;
Reverse protection is: utilize the distributed power source upstream switch of feeder line head end to protect as the second level; configuration time delay is the III section overcurrent protection of the 4th time delay; the distributed power source upstream switch of feeder terminal is utilized to protect as the first order, the I section overcurrent protection of configuration time delay to be the III section overcurrent protection of the 5th time delay and time delay be the 6th time delay.
Form protection act criterion in step D and comprise composition protection accelerated motion criterion, described protection accelerated motion criterion is:
Work as S
1+ S
2+ S
3action during >0,
Work as S
1+ S
2+ S
3be failure to actuate when=0,
Work as S
1+ S
2+ S
3locking during <0, wherein,
S
1, S
2, S
3represent criterion one, two, three,
A represents overcurrent protection outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript 0 represents the protection paid close attention to,
Subscript C represents that offside is protected,
Subscript D represents back side protection,
Subscript L represents that subordinate protects,
Subscript 0B represent pay close attention to protection branched line protection,
Subscript LB represents the branched line protection of subordinate's circuit.
And form protection act criterion in step D and comprise composition breaker fail protection criterion, described breaker fail protection criterion is:
the branched line overcurrent protection outlet action of subordinate's circuit, when circuit breaker is failure to actuate, accelerates tripping circuit breakers,
subordinate's circuit overcurrent protection outlet action, when circuit breaker is failure to actuate, accelerates tripping circuit breakers,
Wherein A represents overcurrent protection outlet action,
B represents circuit breaker outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript L represents that subordinate protects,
Subscript LB represents the branched line protection of subordinate's circuit.
By adopting power distribution network current protection system of the present invention and method, the problem of relay fail after distributed power source access power distribution network can be solved, decreasing power failure range that fault causes simultaneously and guaranteeing distributed power source continued power.Neighborhood information interactive function forms protection act criterion and accelerates backup protection, prevents fault state from worsening, the safe and reliable power supply of safeguards system.In power distribution network current protection system of the present invention and method, protection act criterion utilizes redundant information, has certain fault-tolerance, guarantees reliably to excise fault.
Accompanying drawing explanation
Fig. 1 is the structural representation of power distribution network current protection system in the specific embodiment of the invention.
Fig. 2 is the circuit diagram of a kind of typical distribution net in the specific embodiment of the invention.
Fig. 3 is the differentiation result of protection accelerated motion criterion when there is different typical fault in embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is elaborated.
The example embodiment that following discloses are detailed.But concrete structure disclosed herein and function detail are only the objects for describing example embodiment.
But should be appreciated that, the present invention is not limited to disclosed concrete example embodiment, but covers all modifications, equivalent and the alternative that fall within the scope of the disclosure.In the description to whole accompanying drawing, identical Reference numeral represents identical element.
Should be appreciated that, term "and/or" as used in this comprises one or morely relevant lists any of item and all combinations simultaneously.Should be appreciated that in addition, when parts or unit are called as " connection " or " coupling " to another parts or unit, it can be directly connected or coupled to miscellaneous part or unit, or also can there is intermediate member or unit.In addition, other words being used for describing relation between parts or unit should be understood according to identical mode (such as, " between " to " directly ", " adjacent " to " direct neighbor " etc.).
First, the unified implication that the symbol of outlet in this patent is described:
S
1, S
2, S
3represent criterion one, two, three,
A represents overcurrent protection outlet action,
B represents circuit breaker outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript 0 represents the protection paid close attention to,
Subscript C represents that offside is protected,
Subscript D represents back side protection,
Subscript L represents that subordinate protects,
Subscript 0B represent pay close attention to protection branched line protection,
Subscript LB represents the branched line protection of subordinate's circuit.
Fig. 1 is the structural representation of power distribution network current protection system in the specific embodiment of the invention.As shown in Figure 1, described power distribution network current protection system comprises the failure data acquisition module connected successively, local protection module, neighborhood information interactive module and Fault Identification module, wherein,
The information of collection, for gathering fault current information feeder line being protected installation place and on-load switch after a failure, is sent to local protection module by failure data acquisition module;
Local protection module is used for judging the whether action of local overcurrent protection according to fault current information, and the fault current information of protection act information, on-load switch is sent to neighborhood information interactive module;
On-load switch fault current information for gathering the superior and the subordinate's protection, the protection act information of back side protection and breaker actuation information, and is converted into III section overcurrent protection action message by neighborhood information interactive module;
Fault Identification module is used for information composition protection act criterion neighborhood information interactive module obtained, excision fault.
Therefore, power distribution network current protection system of the present invention can utilize the action message of adjacent protection, and the action message of circuit breaker, forms more complete protection to distribution network system.
Fig. 2 is the circuit diagram of a kind of typical distribution net in the specific embodiment of the invention.Because distribution feeder is shorter, when breaking down, the short circuit current difference of each position is little.Such as; the current quick meeting action at outlet switch place during line to line fault is there is under maximum operational mode in AC feeder line section; and the current quick at outlet switch place when there is line to line fault, AC section downstream can not action, namely AC section is not suitable for the overcurrent protection configuring cascaded coordination.
Therefore, in an embodiment, described local protection module comprises forward protection module and reverse protection module, and three grades of differential overcurrent protections that wherein forward protection module is made up of outlet switch, two backbone switches that can realize Graded coordination are formed; Reverse protection module is made up of the distributed power source upstream switch of feeder terminal, the differential overcurrent protection of upstream switch two-stage that can realize Graded coordination.
Specifically, local protection module comprises forward protection module, is made up of forward three grades of differential overcurrent protections of outlet switch 1, backbone switch 3,4.In addition, local protection module comprises reverse protection module, and the differential overcurrent protection of reverse secondary be made up of protection 6, protection 7 is formed.
Meanwhile, subscriber switch is all furnished with the III section overcurrent protection that time delay is zero second, and the time delay overcurrent protection nature of outlet switch and backbone switch defines the protection of two-stage Graded coordination with nearer subscriber switch.The feeder switch configuring overcurrent protection cooperation in Fig. 2 represents with rectangle, and the feeder switch not configuring current protection cooperation adopts circle to represent.
Especially; described forward protection module is configured to: feeder terminal protection is protected as the third level; configuration time delay is the III section overcurrent protection of zero second; switch in the middle of backbone is protected as the second level; configuration time delay is the III section overcurrent protection of the first time delay; outlet switch is protected as the first order, the I section overcurrent protection of configuration time delay to be the III section overcurrent protection of the second time delay and time delay be the 3rd time delay.
In addition; described reverse protection block configuration is: the distributed power source upstream switch of feeder line head end is protected as the second level; configuration time delay is the III section overcurrent protection of the 4th time delay; the distributed power source upstream switch of feeder terminal is protected as the first order, the I section overcurrent protection of configuration time delay to be the III section overcurrent protection of the 5th time delay and time delay be the 6th time delay.
Above first time delay to the 6th time delay according to system response requirement etc. because usually setting, such as in an embodiment, described first time delay is 0.2 second, the second time delay is 0.4 second, the 3rd time delay is 0.2 second, and the 4th time delay is 0.2 second, the 5th time delay be 0.4 second and the 6th time delay is 0.2 second.
Example in composition graphs 2 illustrates, when fault occurs in F1 place, excises fault by protection 8 without time delay overcurrent protection, by outlet switch 1 with protect 7 to protect excision in support when protection 8 is malfunctioning, and guarantee CE section normal power supply simultaneously.When fault occurs in F2, by protection 1 and protection 7 time delay excision in 0.2 second.When fault occurs in F3, by protection 3 and 6 time delay excision in 0.2 second, if protection 3 is malfunctioning will protect time delay 0.4 second excision fault in support by protection 1.
Be difficult to realize multi-stage protection coordinate because distribution line is shorter, need to excise a large amount of load during traditional protection excision fault.As fault occur in F3 time, conventional current protection scheme is disconnected by switch 3, and the load that now C point is following is all cut.
And in power distribution network over-current protection system of the present invention, use forward protection module and reverse protection block configuration; after realizing directional over current-based-protection thus; fault F3 by protect 3 and protection 6 isolation, ensure that the load of below node E and distributed power source DG2 not cut.Therefore, directional over current-based-protection not only ensures the matching relationship of branch switch and backbone switch, and effectively reduces power failure range, reaches the object of fast and reliable excision fault.
On the other hand, the access of distributed power source can affect the distribution of distribution network failure electric current, and according to drawing outward and helping increasing principle, during line fault, the short circuit current of distributed power source DG node upstream will reduce, and the short circuit current in distributed power source DG node downstream can increase.Under different faults position with different distributions formula power supply DG operational mode, the impact of distributed power source on short circuit current is different.
Due to the randomness of photovoltaic and wind-force distributed power supply DG and intermittence comparatively large, the setting value calculated according to certain operational mode may not adapt to the change of fault current, thus occurs false protection and misaction.In addition, distributed power source DG fault current becomes very little through step-up transformer after-current value, and part distributed power source can not continue to provide short circuit current due to self overcurrent protective device, is difficult to judge according to distributed power source fault current.Therefore, power distribution network current protection system of the present invention and method propose protection accelerated motion criterion, according to protection act information and the breaker actuation information composition protection act criterion of the superior and the subordinate's protection, back side protection, guarantee effectively reliably to excise fault.
Particularly, the overcurrent protection scheme based on local information is the matching relationship ensureing backbone switch and branch switch, and when fault occurs in backbone, quick-action deficiency, needs to be excised by backup protection especially when an error occurs.Such as, when F2 position, fault point is closer to C, the time delay fast tripping protection akinesia of protection 1, needs to excise under the longer time limit by overcurrent protection, may affect transformer or bus safety in station, also there will be this situation when same protection 3 is malfunctioning.
Power distribution network current protection system of the present invention and method, for excise fault fast, propose based on the mutual protection accelerated motion criterion of neighborhood information for protections all on backbone.First on the nodes directional over current-based-protection device is configured; by Feeder Terminal Unit (Feeder Terminal Unit; FTU) in conjunction with protection act information and the breaker actuation information of the superior and the subordinate's protection, back side protection, troubles inside the sample space is positioned, excises fault fast.
Specifically, described protection accelerated motion criterion is:
Work as S
1+ S
2+ S
3action during >0,
Work as S
1+ S
2+ S
3be failure to actuate when=0,
Work as S
1+ S
2+ S
3locking during <0.
Such as when protection 1 is by being paid close attention to protection, and when fault occurs in F2, the overcurrent protection outlet action of protection 1,7, the overcurrent protection outlet of protection 3,8 is failure to actuate, and therefore has
therefore S is had
1=1, S
3=1, i.e. S
1+ S
2+ S
3>0, therefore protects 1 accelerated motion excision fault.And when only configuring the overcurrent protection of local information, need be excised after 0.2s or overcurrent protection 0.4s by protection 1 delaying current fast tripping protection, therefore protection accelerated motion criterion of the present invention can make up the shortcoming of local current protection quick-action deficiency.Some mistake of the information collected or missing part information meanwhile, makes full use of adjacent protection information, forms multiple criterion, each other redundancy, even if also accurately can judge therefore have certain fault-tolerance, reliability is higher.
When fault occurs in F4, for protection 3, its subordinate's route protection outlet action, has S
1+ S
2+ S
3<0, protects 3 lockings, thus the situation avoiding overstep tripping occurs.Give the judged result of protection accelerated motion criterion under different typical fault position in the specific embodiment of the invention in figure 3.
Be all switching value for the protection of the Wide-area Measurement Information of accelerated motion criterion in the present invention, and the scope of Wide-area Measurement Information is only limitted to adjacent node, and therefore transinformation is little.According to existing communication condition; can think be less than its operate time band constant time lag current quick; as long as setting value meets electric current instant protection setting value and wait until that time delay is with regard to action; if fault current disappears between time delay, return, therefore can not affect the independence of local current protection.
In addition, the protection act criterion of Fault Identification module composition also comprises breaker fail protection criterion, and described breaker fail protection criterion is:
the branched line overcurrent protection outlet action of subordinate's circuit, when circuit breaker is failure to actuate, accelerates tripping circuit breakers,
subordinate's circuit overcurrent protection outlet action, when circuit breaker is failure to actuate, accelerates tripping circuit breakers.
Described breaker fail protection criterion illustrates: if protection exit information and circuit-breaker status inconsistent; then think this breaker failure; therefore the tripping circuit breaker adjacent with malfunctioning circuit breaker is accelerated; backup protection far away is returned in time; realize the function of conventional circuit breaker failure protection, and acceleration disturbance excision.
Adapt with power distribution network current protection system of the present invention, the present invention goes back in embodiment and also discloses a kind of power distribution network current protection method, and described method comprises step:
A, after a failure collection feeder line protect the fault current information of installation place and on-load switch;
B, to judge the whether action of local overcurrent protection according to fault current information;
The protection act information of C, the protection of collection the superior and the subordinate, back side protection and breaker actuation information;
D, the superior and the subordinate are protected, the protection act information of back side protection and breaker actuation information composition protection act criterion, excision fault.
In the power distribution network current protection method step B of embodiment, judge whether action comprises forward protection and reverse protection to local overcurrent protection according to fault current information, wherein,
Forward protection is: utilize feeder terminal protection to protect as the third level; configuration time delay is the III section overcurrent protection of zero second; the switch in the middle of backbone is utilized to protect as the second level; configuration time delay is the III section overcurrent protection of the first time delay; outlet switch is utilized to protect as the first order, the I section overcurrent protection of configuration time delay to be the III section overcurrent protection of the second time delay and time delay be the 3rd time delay.
Reverse protection is: utilize the distributed power source upstream switch of feeder line head end to protect as the second level; configuration time delay is the III section overcurrent protection of the 4th time delay; the distributed power source upstream switch of feeder terminal is utilized to protect as the first order, the I section overcurrent protection of configuration time delay to be the III section overcurrent protection of the 5th time delay and time delay be the 6th time delay.
In addition, in the power distribution network current protection method step D of embodiment, composition protection act criterion comprises composition protection accelerated motion criterion, and described protection accelerated motion criterion is:
Work as S
1+ S
2+ S
3action during >0,
Work as S
1+ S
2+ S
3be failure to actuate when=0,
Work as S
1+ S
2+ S
3locking during <0.
In addition, form protection act criterion in step D and comprise composition breaker fail protection criterion, described breaker fail protection criterion is:
the branched line overcurrent protection outlet action of subordinate's circuit, when circuit breaker is failure to actuate, accelerates tripping circuit breakers,
subordinate's circuit overcurrent protection outlet action, when circuit breaker is failure to actuate, accelerates tripping circuit breakers.
Therefore; power distribution network current protection system proposed by the invention and method thereof; main protection is with the protection of double-ended current amount configuration stage spill current, and after effective solution distributed power source access power distribution network, the problem of relay fail, decreases fault outage scope simultaneously and guarantee distributed power source continued power.Neighborhood information forms protection act criterion alternately and accelerates backup protection, prevents fault state from worsening, the safe and reliable power supply of safeguards system.Protection act criterion make use of redundant information, has certain fault-tolerance, guarantees reliably to excise fault.
It should be noted that; above-mentioned execution mode is only the present invention's preferably embodiment; the restriction to distance protection scope of the present invention can not be understood as, not depart under concept thereof of the present invention, with modification, distance protection scope of the present invention is all belonged to any minor variations that the present invention does.
Claims (10)
1. a power distribution network current protection system, described system comprises the failure data acquisition module connected successively, local protection module, neighborhood information interactive module and Fault Identification module, wherein,
The information of collection, for gathering fault current information feeder line being protected installation place and on-load switch after a failure, is sent to local protection module by failure data acquisition module;
Local protection module is used for judging the whether action of local overcurrent protection according to fault current information, and the fault current information of protection act information, on-load switch is sent to neighborhood information interactive module;
On-load switch fault current information for gathering the superior and the subordinate's protection, the protection act information of back side protection and breaker actuation information, and is converted into III section overcurrent protection action message by neighborhood information interactive module;
Fault Identification module is used for information composition protection act criterion neighborhood information interactive module obtained, excision fault.
2. according to the power distribution network current protection system described in claim 1, it is characterized in that, described local protection module comprises forward protection module and reverse protection module, wherein,
Three grades of differential overcurrent protections that forward protection module is made up of outlet switch, two backbone switches that can realize Graded coordination are formed;
Reverse protection module is made up of the distributed power source upstream switch of feeder terminal, the differential overcurrent protection of upstream switch secondary that can realize Graded coordination;
Overcurrent protection and the nearer subscriber switch time delay of outlet switch and backbone switch are the differential overcurrent protection of III section overcurrent protection self-assembling formation secondary of zero second.
3. according to the power distribution network current protection system described in claim 2; it is characterized in that; described forward protection module is configured to: feeder terminal protection is protected as the third level; configuration time delay is the III section overcurrent protection of zero second; switch in the middle of backbone is protected as the second level; configuration time delay is the III section overcurrent protection of the first time delay, and outlet switch is protected as the first order, the I section overcurrent protection of configuration time delay to be the III section overcurrent protection of the second time delay and time delay be the 3rd time delay.
4. according to the power distribution network current protection system described in claim 2; it is characterized in that; described reverse protection block configuration is: the distributed power source upstream switch of feeder line head end is protected as the second level; configuration time delay is the III section overcurrent protection of the 4th time delay; the distributed power source upstream switch of feeder terminal is protected as the first order, the I section overcurrent protection of configuration time delay to be the III section overcurrent protection of the 5th time delay and time delay be the 6th time delay.
5. according to the power distribution network current protection system described in claim 1, it is characterized in that, the protection act criterion of described Fault Identification module composition comprises protection accelerated motion criterion, and described protection accelerated motion criterion is:
Work as S
1+ S
2+ S
3action during >0,
Work as S
1+ S
2+ S
3be failure to actuate when=0,
Work as S
1+ S
2+ S
3locking during <0, wherein,
S
1, S
2, S
3represent criterion one, two, three,
A represents overcurrent protection outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript 0 represents the protection paid close attention to,
Subscript C represents that offside is protected,
Subscript D represents back side protection,
Subscript L represents that subordinate protects,
Subscript 0B represent pay close attention to protection branched line protection,
Subscript LB represents the branched line protection of subordinate's circuit.
6. according to the power distribution network current protection system described in claim 1, it is characterized in that, the protection act criterion of described Fault Identification module composition comprises breaker fail protection criterion, and described breaker fail protection criterion is:
the branched line overcurrent protection outlet action of subordinate's circuit, when circuit breaker is failure to actuate, accelerates tripping circuit breakers,
subordinate's circuit overcurrent protection outlet action, when circuit breaker is failure to actuate, accelerates tripping circuit breakers,
Wherein A represents overcurrent protection outlet action,
B represents circuit breaker outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript L represents that subordinate protects,
Subscript LB represents the branched line protection of subordinate's circuit.
7. a power distribution network current protection method, described method comprises step:
A, after a failure collection feeder line protect the fault current information of installation place and on-load switch;
B, to judge the whether action of local overcurrent protection according to fault current information;
The protection act information of C, the protection of collection the superior and the subordinate, back side protection and breaker actuation information;
D, the superior and the subordinate are protected, the protection act information of back side protection and breaker actuation information composition protection act criterion, excision fault.
8. according to the power distribution network current protection method described in claim 7, it is characterized in that, in the step B of described method, judge whether action comprises forward protection and reverse protection to local overcurrent protection according to fault current information, wherein,
Forward protection is: utilize feeder terminal protection to protect as the third level, configuration time delay is the III section overcurrent protection of zero second, the switch in the middle of backbone is utilized to protect as the second level, configuration time delay is the III section overcurrent protection of the first time delay, outlet switch is utilized to protect as the first order, the I section overcurrent protection of configuration time delay to be the III section overcurrent protection of the second time delay and time delay be the 3rd time delay;
Reverse protection is: utilize the distributed power source upstream switch of feeder line head end to protect as the second level; configuration time delay is the III section overcurrent protection of the 4th time delay; the distributed power source upstream switch of feeder terminal is utilized to protect as the first order, the I section overcurrent protection of configuration time delay to be the III section overcurrent protection of the 5th time delay and time delay be the 6th time delay.
9. according to the power distribution network current protection method described in claim 7, it is characterized in that, form protection act criterion in step D and comprise composition protection accelerated motion criterion, described protection accelerated motion criterion is:
Work as S
1+ S
2+ S
3action during >0,
Work as S
1+ S
2+ S
3be failure to actuate when=0,
Work as S
1+ S
2+ S
3locking during <0, wherein,
S
1, S
2, S
3represent criterion one, two, three,
A represents overcurrent protection outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript 0 represents the protection paid close attention to,
Subscript C represents that offside is protected,
Subscript D represents back side protection,
Subscript L represents that subordinate protects,
Subscript 0B represent pay close attention to protection branched line protection,
Subscript LB represents the branched line protection of subordinate's circuit.
10. according to the power distribution network current protection method described in claim 7, it is characterized in that, form protection act criterion in step D and comprise composition breaker fail protection criterion, described breaker fail protection criterion is:
the branched line overcurrent protection outlet action of subordinate's circuit, when circuit breaker is failure to actuate, accelerates tripping circuit breakers,
subordinate's circuit overcurrent protection outlet action, when circuit breaker is failure to actuate, accelerates tripping circuit breakers,
Wherein A represents overcurrent protection outlet action,
B represents circuit breaker outlet action,
Subscript III represents three sections of overcurrent protections,
Subscript L represents that subordinate protects,
Subscript LB represents the branched line protection of subordinate's circuit.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105977937A (en) * | 2016-06-14 | 2016-09-28 | 华北电力大学 | Logic amount information based power distribution network regional protection system and method |
| CN106655124A (en) * | 2016-12-30 | 2017-05-10 | 南华大学 | Failure protection algorithm and apparatus for line circuit breaker |
| CN106684843A (en) * | 2015-11-10 | 2017-05-17 | 中国电力科学研究院 | Method and system for protecting ring main unit of power distribution network |
| CN106849034A (en) * | 2017-03-14 | 2017-06-13 | 国网江苏省电力公司苏州供电公司 | Overcurrent protection method and device based on power distribution network operation with closed ring mode |
| CN110311359A (en) * | 2019-06-05 | 2019-10-08 | 许继集团有限公司 | A kind of DC distribution net networking protection system |
| CN110416981A (en) * | 2019-07-31 | 2019-11-05 | 华北电力大学 | A kind of access power distribution network zone current guard method of electric car and system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101515716A (en) * | 2009-04-03 | 2009-08-26 | 天津大学 | Current protection method of feeder line containing distributed power |
| CN101872964A (en) * | 2010-07-02 | 2010-10-27 | 华北电力大学 | Wide area measurement system based back-up protection method of multi-terminal high-voltage power transmission area |
| CN102270836A (en) * | 2011-01-30 | 2011-12-07 | 武汉百叡电力技术有限公司 | Wide-area over-current protection method and system for power distribution network |
| CN103779852A (en) * | 2014-03-01 | 2014-05-07 | 华北电力大学 | Regional protection system based on adaptive current protection associated factor and method thereof |
| CN104701825A (en) * | 2015-03-11 | 2015-06-10 | 国家电网公司 | Quick protection method applicable to intelligent distribution network |
-
2015
- 2015-06-17 CN CN201510337303.7A patent/CN104901292B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101515716A (en) * | 2009-04-03 | 2009-08-26 | 天津大学 | Current protection method of feeder line containing distributed power |
| CN101872964A (en) * | 2010-07-02 | 2010-10-27 | 华北电力大学 | Wide area measurement system based back-up protection method of multi-terminal high-voltage power transmission area |
| CN102270836A (en) * | 2011-01-30 | 2011-12-07 | 武汉百叡电力技术有限公司 | Wide-area over-current protection method and system for power distribution network |
| CN102270835A (en) * | 2011-01-30 | 2011-12-07 | 武汉百叡电力技术有限公司 | Distributed over-current protection and interphase fault isolation method for distribution network |
| CN103779852A (en) * | 2014-03-01 | 2014-05-07 | 华北电力大学 | Regional protection system based on adaptive current protection associated factor and method thereof |
| CN104701825A (en) * | 2015-03-11 | 2015-06-10 | 国家电网公司 | Quick protection method applicable to intelligent distribution network |
Non-Patent Citations (1)
| Title |
|---|
| 郭子亮: "配电网广域过电流保护研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684843A (en) * | 2015-11-10 | 2017-05-17 | 中国电力科学研究院 | Method and system for protecting ring main unit of power distribution network |
| CN106684843B (en) * | 2015-11-10 | 2019-08-06 | 中国电力科学研究院 | A kind of power distribution network ring network cabinet guard method and system |
| CN105977937A (en) * | 2016-06-14 | 2016-09-28 | 华北电力大学 | Logic amount information based power distribution network regional protection system and method |
| CN105977937B (en) * | 2016-06-14 | 2018-04-10 | 华北电力大学 | The power distribution network area protection system and method for a kind of logic-based amount information |
| CN106655124A (en) * | 2016-12-30 | 2017-05-10 | 南华大学 | Failure protection algorithm and apparatus for line circuit breaker |
| CN106849034A (en) * | 2017-03-14 | 2017-06-13 | 国网江苏省电力公司苏州供电公司 | Overcurrent protection method and device based on power distribution network operation with closed ring mode |
| CN110311359A (en) * | 2019-06-05 | 2019-10-08 | 许继集团有限公司 | A kind of DC distribution net networking protection system |
| CN110311359B (en) * | 2019-06-05 | 2021-10-22 | 许继集团有限公司 | Networked protection system for direct-current power distribution network |
| CN110416981A (en) * | 2019-07-31 | 2019-11-05 | 华北电力大学 | A kind of access power distribution network zone current guard method of electric car and system |
| CN110416981B (en) * | 2019-07-31 | 2020-07-31 | 华北电力大学 | Electric automobile access distribution network area current protection method and system |
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