CN106154113B - Active power distribution network distribution feeder automation Fault Locating Method - Google Patents
Active power distribution network distribution feeder automation Fault Locating Method Download PDFInfo
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- CN106154113B CN106154113B CN201610472800.2A CN201610472800A CN106154113B CN 106154113 B CN106154113 B CN 106154113B CN 201610472800 A CN201610472800 A CN 201610472800A CN 106154113 B CN106154113 B CN 106154113B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
本发明提供一种有源配电网分布式馈线自动化故障定位方法，其为一种基于故障电流过流状态信息与故障电流相位差信息、利用配电线路上开关配设的智能分布式FA终端实施的新型有源配电网分布式FA故障定位方法；现场实施时，分布式电源接入配电网时均通过断路器接入，且在各分布式电源侧断路器、变电站出口断路器和线路各负荷开关上均配设智能分布式FA终端；智能分布式FA终端通过故障电流过流状态与故障电流相位的统计与分析，分别确定故障区段；故障定位准确，且能有效解决分布式电源的高渗透率接入以及多分支线路配电网络的故障定位难题，可靠性高，工程实施性强且能有铲减小对通信网络的依赖。
The present invention provides an automatic fault location method for a distributed feeder in an active distribution network, which is an intelligent distributed FA terminal based on fault current overcurrent state information and fault current phase difference information and using switches on distribution lines. The new active distribution network distributed FA fault location method implemented; when implemented on site, the distributed power supply is connected to the distribution network through circuit breakers, and the circuit breakers on the distributed power supply side, the substation outlet circuit breaker and the Each load switch of the line is equipped with an intelligent distributed FA terminal; the intelligent distributed FA terminal determines the fault section through the statistics and analysis of the fault current overcurrent state and the fault current phase; the fault location is accurate and can effectively solve the distributed problem. The high penetration rate of the power supply and the fault location of the multi-branch line distribution network are difficult, and the reliability is high, the project implementation is strong, and the shovel can reduce the dependence on the communication network.
Description
Technical field
The present invention relates to active power distribution network FEEDER AUTOMATION fields, and in particular to a kind of active power distribution network distribution feedback
Line automation Fault Locating Method.
Background technique
Distributed generation resource (Distributed Generator, DG) is as a kind of brand-new energy form in world wide
Inside it is widely applied.But as the high permeability of distributed generation resource accesses, power distribution network becomes a multiterminal power supply architecture,
Its trend and the possible two-way flow of short circuit current, so that the relay protection and feeder automation to power distribution network bring new ask
Topic.It is influenced by distributed generation resource injection short circuit current, traditional Fault Locating Method based on overcurrent protection may fail.
Currently, be directed to active power distribution network fault location, part paper refer to using matrix method, distributed generation resource off-grid with
The solutions such as matching method, the jump-value of current direction method of reclosing, but such scheme algorithm calculation amount, secondary reclosing with
Reliability etc. is respectively present some drawbacks, or may be only available for the fairly simple route of topological structure.In addition, application No. is
201510103760.X Chinese invention patent application document disclose a kind of active power distribution network Fault Locating Method, be mainly
For centralized feeder automation.With distributed generation resource high permeability access, power distribution network grid structure it is increasingly sophisticated with
And the continuous development of intelligent distribution type feeder automation (FA), the intelligent distributed fault location side FA that research is more effectively applicable in
Method has great importance to the feeder automation construction of active power distribution network.
Summary of the invention
The object of the present invention is to provide a kind of active based on fault current over-current state information and fault current phase difference
Power distribution network distribution feeder automation Fault Locating Method, it is accurately fixed that this method can carry out the line fault of active power distribution network
Position.
The technical scheme is that active power distribution network distribution feeder automation Fault Locating Method of the invention,
Fault current over-current state information and fault current phase are based on using the intelligent distributed FA terminal that distribution line upper switch is arranged
Potential difference information is implemented；Using such as giving a definition:
It defines one: switch: being switched including substation exit breaker, distributed electrical source breaker and line load；It opens
Guan YongSWIt indicates；Local FA terminal: referring to the intelligent distributed FA terminal for carrying out fault location, and the switch attached is local
Switch；
Definition two: sectionS: indicate the set of all switches in a certain section of distribution line；One switchSWLeft end area
Section is defined asSl, right end section is defined asSr；
Define three:fco: indicate the fault current state of its attached switch of intelligent distributed FA terminal detection, fco=
1, expression monitors fault current；fco=0, expression does not monitor fault current；
Define four:Indicate switchSWLeft end sectionSlIt does not inside include local open
It closesSWjThe corresponding fault current state summation of every other switch；Indicate switchSW
Right end sectionSrIt does not inside include local switchSWjThe corresponding fault current state summation of every other switch；And it willIt is denoted asfcsum；
Define five:f: indicate that local FA terminal fault positions as a result, i.e. Reflector；f=1 indicates that local FA terminal is fixed
Position occurs to failure in the left end section locally switchedSlOr right end sectionSr；f=0 indicates left end sectionSlOr right end area
SectionSrIt does not break down；
Definition six: Δθ: indicate current and phase difference；δ: it indicates to consider line impedance and failure electricity when calculating current phase difference
Resistance influences and preset error angle；
Method the following steps are included:
1. local FA terminal judges whether the local switch belonging to it is substation exit breaker, if substation exit
2. breaker executes step；If local switch is on-load switch or distributed electrical source breaker, step is executed 5.；
2. the right end section of substation exit breakerSrThe intelligent distributed FA terminal being arranged is communicated with local FA terminal
And transmitting over-current state information；Local FA terminal statisticsfcsumValue, and according tofcsumValue accordingly execute step 3. or step
Suddenly 4.；
3. iffcsum=0, local FA terminal determines that failure occursSrSection, assignment Reflectorf=1, and execute step
⑧；
4. iffcsum=1, local FA terminal determinesSrSection is received without branch line, local FA terminalSrIt is another in section
Switch be arranged intelligent distributed FA terminal send current waveform information and calculate substation exit breaker withSrIn section
The current and phase difference of another switch, if phase difference meets Δθ∈[180°-δ, 180 °+δ], then determine that failure occursSrSection,
Assignment Reflectorf=1；Otherwise determine fault-free, assignment Reflectorf=0, and execute step 8.；
Iffcsum> 1, local FA terminal determinesSrSection band branch line,SrIt does not include that locally switch all open in section
It closes the intelligent distributed FA terminal being arranged and current waveform information is passed into local FA terminal, local FA terminal calculates separatelySrArea
The current and phase difference of all excess flow switchs in section, if there is any one group of current and phase difference to meet Δθ∈[180°-δ, 180 °+δ],
Then determine that failure occursSrSection, assignment Reflectorf=1；Otherwise determine fault-free, assignment Reflectorf=0, and
Execute step 8.；
5. local switch is on-load switch or the side DG breaker, left end sectionSlOr right end sectionSrThe intelligence of arranging
Energy distribution FA terminal communicates with local FA terminal respectively and transmits over-current state information, local FA terminal statisticsfcsumValue,
And according tofcsumValue accordingly execute step 6. or step 7.；
6. iffcsum=0, then determine fault-free, assignment Reflectorf=0, and execute step 8.；
Iffcsum=1, then determine that failure occursSrOrSlSection, assignment Reflectorf=1, and execute step 8.；
7. iffcsum>=2, local FA terminal receivesSrIt does not include the intelligence that all switches locally switched are arranged in section
The current waveform information of distributed FA terminal transmission simultaneously calculates separatelySrThe current and phase difference of all excess flow switchs in section, if having
Any one group of current and phase difference meets Δθ∈[180°-δ, 180 °+δ], then determine that failure occursSrSection, assignment failure mark
Willf=1, and execute step 8.；
IfSrΔ is not satisfied in the current and phase difference of all excess flow switchs in sectionθ∈[180°-δ, 180 °+δ], local FA
Terminal receivesSlIt does not include the current waveform for the intelligent distributed FA terminal transmission that all switches locally switched are arranged in section
Information simultaneously calculates separatelySlThe current and phase difference of all excess flow switchs in section, if there is any one group of current and phase difference to meet Δθ
∈[180°-δ, 180 °+δ], then determine that failure occursSlSection, assignment Reflectorf=1, and execute step 8.；IfSlArea
Δ is also not satisfied in the current and phase difference of all excess flow switchs in sectionθ∈[180°-δ, 180 °+δ], then determineSlSection andSrArea
Section fault-free occurs, assignment Reflectorf=0, and execute step 8.；
8. completing fault location, step is executed 9.；
9. if Reflectorf=1, then carry out Fault Isolation；If Reflectorf=0, then without carrying out Fault Isolation.
The present invention has the effect of positive: (1) active power distribution network distribution feeder automation fault location side of the invention
Method uses distributed decision making mode, without main website, the cooperation of substation, passes through each intelligence of distribution topology computational rules
The communication range of distributed FA terminal, reduces the dependence to communication network.(2) active power distribution network distribution feeder line of the invention
Fault Locating Method is automated, fault current over-current state and failure are passed through by the intelligent distributed FA terminal on distribution line
The statistics and analysis of current phase determine fault section respectively, and fault location is accurate, and can effectively solve the height of distributed generation resource
The fault location problem of permeability access and multipoint line distribution network, high reliablity, engineering construction are strong.(3) this hair
Bright active power distribution network distribution feeder automation Fault Locating Method, is completely suitable for matching without the tradition of distributed generation resource
Power grid, compatibility are high.
Detailed description of the invention
Fig. 1 is currently preferred one simple Double-End Source network, to illustrate the phase difference characteristics of fault current；
Fig. 2 is flow chart of the invention；
Fig. 3 is a kind of active power distribution network network structure of application examples of the present invention.
Specific embodiment
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
(embodiment 1)
The active power distribution network distribution feeder automation Fault Locating Method of the present embodiment is based on fault current to be a kind of
Over-current state information and fault current phase information are implemented using the intelligent distributed FA terminal that distribution line upper switch is arranged
New Active power distribution network distribution FA Fault Locating Method.When field conduct, distributed generation resource passes through when accessing power distribution network
Breaker access, and be arranged on each distributed electrical source breaker, substation exit breaker and each on-load switch of route
Intelligent distributed FA terminal is defined as follows for the ease of the description of method:
It defines one: switch: being switched including substation exit breaker, distributed electrical source breaker and line load；It opens
Guan YongSWIt indicates；Local FA terminal: referring to the intelligent distributed FA terminal for carrying out fault location, and the switch attached is local
Switch；
Definition two: sectionS: indicate the set of all switches in a certain section of distribution line；One switchSWLeft end area
Section is defined asSl, right end section is defined asSr；
Define three:fco: indicate the fault current state of its attached switch of intelligent distributed FA terminal detection, fco=
1, expression monitors fault current；fco=0, expression does not monitor fault current；
Define four:Indicate switchSWLeft end sectionSlIt does not inside include local open
It closesSWjThe corresponding fault current state summation of every other switch；Expression is opened
It closesSWRight end sectionSrIt does not inside include local switchSWjThe corresponding fault current state summation of every other switch；And it willIt is denoted asfcsum；
Define five:fIndicate the positioning of local FA terminal fault as a result, i.e. Reflector, if local FA terminal positioning is to former
Left end section in its attached switch occurs for barrierSlOr right end sectionSr, then assignmentf=1, conversely, then assignmentf=0, it indicates
Left end sectionSlOr right end sectionSrThere is no failure；
Definition six: Δθ: indicate current and phase difference；δ: it indicates to consider line impedance and failure electricity when calculating current phase difference
Resistance influences and preset error angle.
See that Fig. 1, the present embodiment say fault current phase difference characteristics by taking a preferred Double-End Source network as an example
Bright: the network is by a system power supplyE S , a distributed generation resource DG and 4 switches compositions, and match on each switch
If electric current of the intelligent distributed FA terminal to monitor each switch is broken down with the F point between BC sections of switches 3 and switch 4
For, the fault current phase difference for flowing through switch 3 and switch 4 is approximately 180 °, it is contemplated that the impedance of route and fault resstance
Influence, step-up error angleδ,δCan according to different network models within the scope of 0~90 ° flexible configuration.I.e. failure occurs in area
When in section, fault current phase differenceθMeet Δθ∈[180°-δ, 180 °+δ], and the switching current outside fault section is in the same direction,
The electric current of AB sections of switch 1 and switch 2 is in the same direction as shown in figure 1, i.e., phase difference is 0.
Referring to fig. 2, the distributed FA Fault Locating Method of the active power distribution network of the present embodiment, mainly comprises the steps that
1. local FA terminal judges whether the local switch belonging to it is substation exit breaker, if substation exit
2. breaker executes step；If local switch is on-load switch or distributed electrical source breaker, step is executed 5.；
2. the right end section of substation exit breakerSrThe intelligent distributed FA terminal being arranged is communicated with local FA terminal
And transmitting over-current state information；Local FA terminal statisticsfcsumValue, and according tofcsumValue accordingly execute step 3. or step
Suddenly 4.；
3. iffcsum=0, local FA terminal determines that failure occursSrSection, assignment Reflectorf=1, and execute step
⑧；
4. iffcsum=1, local FA terminal determinesSrSection is received without branch line, local FA terminalSrIt is another in section
Switch be arranged intelligent distributed FA terminal send current waveform information and calculate substation exit breaker withSrIn section
The current and phase difference of another switch, if phase difference meets Δθ∈[180°-δ, 180 °+δ], then determine that failure occursSrSection,
Assignment Reflectorf=1；Otherwise determine fault-free, assignment Reflectorf=0, and execute step 8.；
Iffcsum> 1, local FA terminal determinesSrSection band branch line,SrIt does not include that locally switch all open in section
It closes the intelligent distributed FA terminal being arranged and current waveform information is passed into local FA terminal, local FA terminal calculates separatelySrArea
The current and phase difference of all excess flow switchs in section, if there is any one group of current and phase difference to meet Δθ∈[180°-δ, 180 °+δ],
Then determine that failure occursSrSection, assignment Reflectorf=1；Otherwise determine fault-free, assignment Reflectorf=0, and
Execute step 8.；
5. local switch is on-load switch or the side DG breaker, left end sectionSlOr right end sectionSrThe intelligence of arranging
Energy distribution FA terminal communicates with local FA terminal respectively and transmits over-current state information, local FA terminal statisticsfcsumValue,
And according tofcsumValue accordingly execute step 6. or step 7.；
6. iffcsum=0, then determine fault-free, assignment Reflectorf=0, and execute step 8.；
Iffcsum=1, then determine that failure occursSrOrSlSection, assignment Reflectorf=1, and execute step 8.；
7. iffcsum>=2, local FA terminal receivesSrIt does not include the intelligence that all switches locally switched are arranged in section
The current waveform information of distributed FA terminal transmission simultaneously calculates separatelySrThe current and phase difference of all excess flow switchs in section, if having
Any one group of current and phase difference meets Δθ∈[180°-δ, 180 °+δ], then determine that failure occursSrSection, assignment failure mark
Willf=1, and execute step 8.；
IfSrΔ is not satisfied in the current and phase difference of all excess flow switchs in sectionθ∈[180°-δ, 180 °+δ], local FA
Terminal receivesSlIt does not include the current waveform for the intelligent distributed FA terminal transmission that all switches locally switched are arranged in section
Information simultaneously calculates separatelySlThe current and phase difference of all excess flow switchs in section, if there is any one group of current and phase difference to meet Δθ
∈[180°-δ, 180 °+δ], then determine that failure occursSlSection, assignment Reflectorf=1, and execute step 8.；IfSlArea
Δ is also not satisfied in the current and phase difference of all excess flow switchs in sectionθ∈[180°-δ, 180 °+δ], then determineSlSection andSrArea
Section fault-free occurs, assignment Reflectorf=0, and execute step 8.；
8. completing fault location, step is executed 9.；
9. if Reflectorf=1, then carry out Fault Isolation；If Reflectorf=0, then without carrying out Fault Isolation.
(application examples)
See Fig. 3, by taking a preferred active power distribution network as an example, to the active power distribution network distribution feeder line of previous embodiment from
The application of dynamicization Fault Locating Method is further described.
It is equipped on outlet breaker, on-load switch and the side DG breaker (DG, that is, distributed generation resource) intelligent distributed
FA terminal, and adjacent intelligent distributed FA terminal communicates with each other in same section, transmitting failure over-current state information and event
Hinder current waveform.It is broken down below with the F point in Fig. 3 and detailed analysis is carried out to the Fault Locating Method of the present embodiment.Below
In analysis, section is with S(3,4,5,6) similar mode describes, and indicates the side on-load switch S3, S6 and DG breaker S4, S5
Form a section S.
For on-load switch S3, the intelligent distributed FA terminal being mounted on on-load switch S3 executes Fault Locating Method packet
Include step 1.~step 5., it is specific as follows:
1. the left end section S(2,3 of on-load switch S3) in on-load switch S2 and right end section S(3,4,5,6) in DG
The intelligent distribution that the intelligent distributed FA terminal that side breaker S4, S5 and on-load switch S6 are arranged is arranged with on-load switch S3 respectively
The communication of formula FA terminal and transmitting over-current state information, the intelligent distributed FA terminal statistics that on-load switch S3 is arrangedfcsumValue,
And according tofcsumValue accordingly execute step 2. or step 3.；
2. iffcsum=0, then the intelligent distributed FA terminal that on-load switch S3 is arranged determines fault-free, assignment failure
Markf=0, and execute step 4.；Iffcsum=1, then determine that the right end section S(3 in on-load switch S3 occurs for failure, 4,5,
6) in or in left side section S (2,3) section of on-load switch S3, and step is executed 4.；
3. whenfcsumWhen >=2,The intelligent distributed FA terminal that on-load switch S3 is arranged receives the right side of on-load switch S3 first
End section S(3,4,5,6) in the current wave that sends of the intelligent distributed FA terminal that is arranged of all on-load switches and the side DG breaker
Shape, and calculate separately S(3,4,5,6) in section all excess flow switchs phase difference, it is assumed that the right end section S of on-load switch S3
The equal overcurrent of the side on-load switch S4, S6 and DG killer switch S6 in (3,4,5,6), then when switch S3 and S4, S3 and S5, S3 with
S6, S4 and S5, S4 and S6, S5 and S6 fault current phase difference there is one group to meet Δθ∈[180°-δ, 180 °+δ], then load
The intelligent distributed FA terminal that switch S3 is arranged determines that failure occurs in S(3,4,5,6) section, and assignment Reflectorf=1, and hold
Row step is 4.；
If the right end section S(3,4,5,6 of on-load switch S3) in the current and phase differences of all excess flow switchs Δ is not satisfiedθ
∈[180°-δ, 180 °+δ], the intelligent distributed FA terminal that on-load switch S3 is arranged receives the left end section S of on-load switch S3
The current waveform that the intelligent distributed FA terminal that (2,3) internal loading switch S2 is arranged is sent, if on-load switch S2 overcurrent, load
The current and phase difference of intelligent distributed FA terminal calculated load switch S2 and S3 that switch S3 is arranged, if phase difference meets Δθ∈
[180°-δ, 180 °+δ], then the intelligent distributed FA terminal that on-load switch S3 is arranged determines that failure occurs on-load switch S3's
Left end section S(2,3) in section, assignment Reflectorf=1, and execute step 4.；If the current phase of on-load switch S2 and S3
Difference is also unsatisfactory for Δθ∈[180°-δ, 180 °+δ], then on-load switch S3 be arranged intelligent distributed FA terminal determine S(2,3)
Also fault-free occurs in section, and the local left end section for switching (i.e. on-load switch S3) and right end section are healthy sections, assigns
It is worth Reflectorf=0, and execute step 4.；
4. completing fault location, step is executed 5.；
5. if Reflectorf=1, Fault Isolation is carried out, and disconnect S3 switch；If Reflectorf=0, then without carrying out event
Phragma from.
Similarly, the intelligent distributed FA terminal outlet breaker S1 of substation's first, outlet breaker S1 being arranged
Executing Fault Locating Method includes step S101~step S105, specific as follows:
Step S101: the outlet breaker S1 of substation's first only contains right end section S(1, and 2), and on-load switch S2 is arranged
Intelligent distributed FA terminal communicate and transmitted with the outlet breaker S1 of the substation first intelligent distributed FA terminal being arranged
Flow state information, statisticsfcsumValue, outlet breaker S1 be arranged intelligent distributed FA terminal according tofcsumValue it is corresponding
Execute step S102 or step S103；
Step S102: iffcsumThe outlet breaker S1 of=0, Ji Jin substation first detects over-current state information, then sentences
Determine failure and occurs right end section S(1 in outlet breaker S1,2) in, assignment Reflectorf=1, and execute step S104；
Step S103: iffcsumThe right end section S(1 of=1, i.e. outlet breaker S1,2) the on-load switch S2 overcurrent in,
The fault current phase difference for comparing the outlet breaker S1 and on-load switch S2 of substation's first at this time, if phase differenceθ∈
[180°-δ, 180 °+δ], then determine that failure occurs in S(1,2) section, assignment Reflectorf=1, execute step S104；If becoming
The fault current phase difference of the outlet breaker S1 and on-load switch S2 of power station first are unsatisfactory for Δθ∈[180°-δ, 180 °+δ],
Then determine S(1,2) section is healthy sections, assignment Reflectorf=0, execute step S104；
Step S104: completing fault location, executes step S105；
Step S105: if Reflectorf=1, Fault Isolation is carried out,；If Reflectorf=0, then without being isolated.
Above embodiments are the explanations to a specific embodiment of the invention, rather than limitation of the present invention, related technology
The technical staff in field without departing from the spirit and scope of the present invention, can also make various transformation and variation and obtain
To corresponding equivalent technical solution, therefore all equivalent technical solutions should be included into patent protection model of the invention
It encloses.
Claims (1)
1. a kind of active power distribution network distribution feeder automation Fault Locating Method, it is characterised in that: it is using on distribution line
The intelligent distributed FA terminal that switch is arranged is based on fault current over-current state information and fault current phase information is implemented；It adopts
With such as giving a definition:
It defines one: switch: being switched including substation exit breaker, distributed electrical source breaker and line load；Switch is usedSWIt indicates；Local FA terminal: referring to the intelligent distributed FA terminal for carrying out fault location, and the switch attached is local opens
It closes；
Definition two: sectionS: indicate the set of all switches in a certain section of distribution line；One switchSWLeft end section it is fixed
Justice isSl, right end section is defined asSr；
Define three:fco: indicate the fault current state of its attached switch of intelligent distributed FA terminal detection, fco=1, table
Show and monitors fault current；fco=0, expression does not monitor fault current；
Define four:Indicate switchSWLeft end sectionSlIt does not inside include local switchSWjThe corresponding fault current state summation of every other switch；Indicate switchSWRight end sectionSrIt does not inside include local switchSWjThe corresponding fault current state summation of every other switch；And it willIt is denoted asfcsum；
Define five:f: indicate that local FA terminal fault positions as a result, i.e. Reflector；f=1 expression local FA terminal positioning arrives
Failure occurs in the left end section locally switchedSlOr right end sectionSr；f=0 indicates left end sectionSlOr right end sectionSr
It does not break down；
Definition six: Δθ: indicate current and phase difference；δ: when indicating calculating current phase difference, consider line impedance and fault resstance shadow
Loud and preset error angle；
Method the following steps are included:
1. local FA terminal judges whether the local switch belonging to it is substation exit breaker, if substation exit open circuit
2. device executes step；If local switch is on-load switch or distributed electrical source breaker, step is executed 5.；
2. the right end section of substation exit breakerSrThe intelligent distributed FA terminal being arranged is communicated and is passed with local FA terminal
Pass over-current state information；Local FA terminal statisticsfcsumValue, and according tofcsumValue accordingly execute step 3. or step 4.；
3. iffcsum=0, local FA terminal determines that failure occursSrSection, assignment Reflectorf=1, and execute step 8.；
4. iffcsum=1, local FA terminal determinesSrSection is received without branch line, local FA terminalSrAnother switch in section
Be arranged intelligent distributed FA terminal send current waveform information and calculate substation exit breaker withSrIt is another in section
The current and phase difference of switch, if phase difference meets Δθ∈[180°-δ, 180 °+δ], then determine that failure occursSrSection, assignment
Reflectorf=1；Otherwise determine fault-free, assignment Reflectorf=0, and execute step 8.；
Iffcsum> 1, local FA terminal determinesSrSection band branch line,SrIt does not include that all switches locally switched are matched in section
If intelligent distributed FA terminal current waveform information is passed into local FA terminal, local FA terminal calculates separatelySrIn section
The current and phase difference of all excess flow switchs, if there is any one group of current and phase difference to meet Δθ∈[180°-δ, 180 °+δ], then sentence
Determine failure to occurSrSection, assignment Reflectorf=1；Otherwise determine fault-free, assignment Reflectorf=0, and execute
Step is 8.；
5. local switch is on-load switch or the side DG breaker, left end sectionSlOr right end sectionSrThe intelligence of arranging point
Cloth FA terminal communicates with local FA terminal respectively and transmits over-current state information, local FA terminal statisticsfcsumValue, and root
According tofcsumValue accordingly execute step 6. or step 7.；
6. iffcsum=0, then determine fault-free, assignment Reflectorf=0, and execute step 8.；
Iffcsum=1, then determine that failure occursSrOrSlSection, assignment Reflectorf=1, and execute step 8.；
7. iffcsum>=2, local FA terminal receivesSrIt does not include the intelligent distribution that all switches locally switched are arranged in section
The current waveform information of formula FA terminal transmission simultaneously calculates separatelySrThe current and phase difference of all excess flow switchs in section, if having any
One group of current and phase difference meets Δθ∈[180°-δ, 180 °+δ], then determine that failure occursSrSection, assignment Reflectorf=
1, and execute step 8.；
IfSrΔ is not satisfied in the current and phase difference of all excess flow switchs in sectionθ∈[180°-δ, 180 °+δ], local FA terminal
It receivesSlIt does not include the current waveform information for the intelligent distributed FA terminal transmission that all switches locally switched are arranged in section
And it calculates separatelySlThe current and phase difference of all excess flow switchs in section, if there is any one group of current and phase difference to meet Δθ∈
[180°-δ, 180 °+δ], then determine that failure occursSlSection, assignment Reflectorf=1, and execute step 8.；IfSlSection
Δ is also not satisfied in the current and phase difference of interior all excess flow switchsθ∈[180°-δ, 180 °+δ], then determineSlSection andSrSection
Equal fault-free occurs, assignment Reflectorf=0, and execute step 8.；
8. completing fault location, step is executed 9.；
9. if Reflectorf=1, then carry out Fault Isolation；If Reflectorf=0, then without carrying out Fault Isolation.
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| CN106790266A (en) * | 2017-02-13 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | The communication means and device of a kind of intelligent distribution type feeder automation |
| CN107462810B (en) * | 2017-07-19 | 2020-04-21 | 中国科学院电工研究所 | A fault section location method suitable for active distribution network |
| CN108548987A (en) * | 2017-10-31 | 2018-09-18 | 国网江苏省电力公司扬州供电公司 | Fault location method for active distribution network based on current phase change |
| CN111146772A (en) * | 2018-11-06 | 2020-05-12 | 上海良信电器股份有限公司 | Circuit breaker directional overcurrent protection method |
| CN109709445A (en) * | 2018-12-21 | 2019-05-03 | 云南电网有限责任公司电力科学研究院 | Fault location and processing method for high-penetration distributed power supply access to distribution network |
| CN111090021B (en) * | 2019-11-07 | 2022-11-22 | 国网浙江省电力有限公司衢州供电公司 | Fault positioning method for composite low-voltage power distribution network |
| CN111948490B (en) * | 2020-08-05 | 2023-01-10 | 汪子岩 | Fault positioning and processing method for active power distribution network |
| CN114221301B (en) * | 2021-12-03 | 2023-11-14 | 北方工业大学 | Alternating-current micro-grid protection method and device considering photovoltaic low-voltage ride through characteristics |
| CN117175509B (en) * | 2023-05-08 | 2024-10-01 | 威胜能源技术股份有限公司 | Single-phase grounding fault handling method for distribution network with high penetration distributed generation |
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