CN106610448A - Adaptive overcurrent fault positioning method based on technology of STU recognition network topology - Google Patents
Adaptive overcurrent fault positioning method based on technology of STU recognition network topology Download PDFInfo
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- CN106610448A CN106610448A CN201611158743.7A CN201611158743A CN106610448A CN 106610448 A CN106610448 A CN 106610448A CN 201611158743 A CN201611158743 A CN 201611158743A CN 106610448 A CN106610448 A CN 106610448A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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Abstract
The invention provides an adaptive overcurrent fault positioning method based on the technology of STU recognition network topology, and the method comprises the steps: 1), building network topology information; 2), carrying out the adaptive fault positioning. The step of adaptive fault positioning mainly comprises the steps of single-power supply and multi-power supply. The single-power supply judgment comprises the steps: 11), intelligent terminal starting; 12), communication with an adjacent terminal; 13), fault criterion. The multi-power supply judgment comprises the steps: 21), intelligent terminal starting; 22), the determining of a fault start moment; 23), fault current phase calculation; 24), fault criterion. After a line has a fault, a proper overcurrent fault positioning method can be adaptively selected according to the real-time network structure of a system, and a distributed algorithm is employed. A main station does not need to participate, and the positioning speed is high. The power supply reliability of the system is improved.
Description
Technical field
The invention provides a kind of over current fault localization method, especially a kind of to recognize network topologies based on STU
Self adaptation over current fault localization method.
Background technology
At present, power system usually increases testing equipment using extra, not only increases when over current fault positioning is carried out
Monitoring cost, and process complexity is monitored, it is unfavorable for that extension is used.In addition, existing monitoring means during being monitored simultaneously
The power supply state that system can not be directed to carrys out adaptively changing monitor mode, causes the reliability decrease for monitoring, it is difficult to meet current
The monitoring requirement of power system high reliability.
The content of the invention
The technical problem to be solved in the present invention is that existing monitoring method needs extra increase equipment, and can not be according to system
Power supply state carry out adaptively changing monitor mode, reliability is poor.
In order to solve above-mentioned technical problem, the invention provides a kind of self adaptation that network topologies are recognized based on STU
Over current fault localization method, comprises the steps：
Step 1, master control STU set up the network real-time topology structure of system by inquiry mode step by step, and according to network reality
When topological structure judge that system is presently at single supply power supply state or multiple feed state；
Step 2, master control STU according to the adaptively selected corresponding fault location flow process of power supply state, if single supply is powered,
Single supply fault location flow process is entered then, if multiple feed, then into many power failure positioning flows, wherein,
Single supply fault location flow process is concretely comprised the following steps：
Started using the Sudden Changing Rate of transient zero-sequence current from control STU, and led to from control STU with adjacent upon actuation
Letter, obtains the fault current information of adjacent switch；If adjacent switch detects fault current, failure is not in the adjacent switch
On section；If adjacent switch is not detected by fault current or no adjacent switch, failure is on the section of adjacent switch；
Many power failure positioning flows are concretely comprised the following steps：
Started using difference of phase currents from control STU, and the first catastrophe point for detecting is calculated into failure as from control STU
The phase place starting point of electric current, failure occur after, respectively from control STU according to mutation current detect fault-signal, and write down receive therefore
Barrier signal moment, and on the basis of this moment calculate fault current real-time phase, then by the phase place starting point of fault current with
Real-time phase is compared calculating；If there is two adjacent phase contrasts for comparing calculating from control STU to be 180 °, failure this two
On section between the individual adjacent STU from control；It is if the phase contrast for comparing calculating from control STU is 0 °, adjacent from control STU with this
No failure on section.
It is as the further limits scheme of the present invention, in step 2, when being started from control STU using difference of phase currents, mutually electric
Stream Sudden Changing Rate computing formula be：
In formula,For difference of phase currents,For the phase current sampling value of K points,It is to light 1 cycle forward from K
Current sampling data, N is the sampled point of every frequency cycle,It is the current sampling data that 2 cycles forward are lighted from K；As Δ Iφ
＞ IsetWhen, IsetSudden Changing Rate for setting starts threshold value, then start from control STU.
The beneficial effects of the present invention is：(1) can real-time query network topology structure, according to different topology structure self adaptation
Select suitable location algorithm, strong applicability；(2) from control distributed location method, it is not necessary to which main website is participated in, locating speed is fast,
Adaptability is wide；(3) fault-signal Self-synchronous algorithm is adopted during operation with closed ring, and without the need for additionally increasing monitoring device, system letter
Single, low cost and easy to implement.
Description of the drawings
Fig. 1 is method of the present invention flow chart；
Fig. 2 is the system structure diagram of the present invention；
Fig. 3 is the fault location flow chart under the single supply state of the present invention；
Fig. 4 is the fault location flow chart under many power supply status of the present invention.
Specific embodiment
As Figure 1-4, a kind of self adaptation over current fault based on STU identification network topologies that the present invention is provided is fixed
Position method, comprises the steps：
Step 1, master control STU set up the network reality of system directly in response to by way of inquiring about step by step, being queried from control STU
When topological structure, and single supply power supply state or many power supplys be presently at according to network real-time topology structure decision system supply
Electricity condition；
Step 2, master control STU according to the adaptively selected corresponding fault location flow process of power supply state, if single supply is powered,
Single supply fault location flow process is entered then, if multiple feed, then into many power failure positioning flows, wherein,
Single supply fault location flow process is concretely comprised the following steps：
Started using the Sudden Changing Rate of transient zero-sequence current from control STU, and led to from control STU with adjacent upon actuation
Letter, obtains the fault current information of adjacent switch；If adjacent switch detects fault current, passing through property of failure is illustrated, then
Failure is not on the section of the adjacent switch；If adjacent switch is not detected by fault current or no adjacent switch, failure is illustrated
Electric current is injection, then failure on the section of adjacent switch, and confirm should from control STU it is corresponding switch belong to fault section
Upstream boundary is switched；
Many power failure positioning flows are concretely comprised the following steps：
Started using difference of phase currents from control STU, failure initial time, circuit are determined using fault-signal motor synchronizing
After breaking down, the failure initial time detected from control STU can be considered as synchronization, i.e., by the inspection of first catastrophe point
Survey can determine failure initial time, therefore can be using the first catastrophe point for detecting as the phase place that fault current is calculated from control STU
Starting point, the computing formula of difference of phase currents is：
In formula,For difference of phase currents,For the phase current sampling value of K points,It is to light 1 cycle forward from K
Current sampling data, N is the sampled point of every frequency cycle,It is the current sampling data that 2 cycles forward are lighted from K；As Δ Iφ
＞ IsetWhen, IsetSudden Changing Rate for setting starts threshold value, then start from control STU.Failure occur after, respectively from control STU according to
Mutation current detects fault-signal, and writes down the moment for receiving fault-signal, and on the basis of this moment calculates fault current
Real-time phase, then the phase place starting point of fault current and real-time phase are compared into calculating；If have two it is adjacent from control STU
The phase contrast for relatively calculating is 180 °, then failure is adjacent from the section between control STU at this two；If comparing from control STU
The phase contrast of calculating is 0 °, then with this from no failure on the control adjacent sections of STU.
The principle of the self adaptation over current fault localization method of the present invention is described as follows：
Master control STU sets up concretely comprising the following steps for applied topology by the way of inquiring about step by step：Inquire about adjacent from control first
STU, obtains its local topology information and next stage from the mailing address of control STU；Then next stage is inquired about from control STU, obtain
The mailing address of its local topology information and next stage terminal；The like, until inquire control domain border from control
STU, so as to set up network topology structure.After topology is set up, the displacement of all switches in real-time monitoring topology is believed by master control STU
Breath, carries out the real-time update of topology when topological structure changes.
Single supply is powered, and flows through fault current using fault section, and non-faulting section carries out event without flow through fault current
Barrier positioning.Started using the Sudden Changing Rate of transient zero-sequence current from control STU, check adjacent switch whether also faulty electric current stream
Cross.If adjacent switch is monitored (such as the switch of same ring main unit) from control STU by same, directly can check from control STU
The whether faulty electric current of adjacent switch flows through, and otherwise needs with adjacent from control STU communications, obtains the inspection of adjacent switch fault current
Survey result.Fault location criterion：If the adjacent switch in switch side detects fault current, passing through property of failure is illustrated,
Failure is not on the section of the side；If the adjacent no fault current of switch in switch side flows through no in other words adjacent
Switch, illustrates that fault current is injection, and failure is in the lateral areas section, and confirms that oneself belonging to fault section upstream boundary opens
Close (switch adjacent with section is referred to as section boundaries switch, in boundary switch near transformer station switch, referred to as upstream boundary
Switch).
Multiple feed, it is using phase bit comparison Fault Locating Method, i.e., contrary using the fault section both sides sense of current
Principle realizes fault location.From control STU using mutation current start, each from control STU detect fault-signal when, write down reception
To the moment of fault-signal, and using the time as the benchmark of fault current phase calculation.Each receives failure letter from control STU
After number, its fault phase is calculated respectively, the fault current phase contrast of foundation only fault section both sides determines failure for 180 °
Section.
As shown in Fig. 2 distributed FA systems are mainly made up of QS1, QS2 (outlet switch) and Q1, Q2, Q3, Q4, Q5, and
Each switch corresponds to a STU.
It is normal when running, cross the network topology that inquiry mode step by step obtains system near the STUA of transformer station, STUA according to
System is powered in single supply or multiple feed state self-adaption uses suitable fault location algorithm.When detecting STU3
During to disconnect, i.e., when system is in single supply power supply mode, after failure occurs, STU2 detects the startup of failure mutation current, and
Communicated with adjacent S TU1, STU3, the whether faulty electric current of inquiry adjacent switch flows through, the section for not having fault current is event
Barrier section.When STU3 is detected to close, i.e., when system is in multiple feed mode, after failure occurs, STU2, STU3 inspection
Start after measuring fault current, and communicate with adjacent S TU1, STU4, calculate the phase place of respective fault current and compare adjacent switch
Fault current phase place, the section of opposite in phase is fault section.
The beneficial effect of self adaptation over current fault localization method that the present invention is provided is：
(1) can real-time query network topology structure, according to the adaptively selected suitable location algorithm of different topology, the suitability
By force.
(2) distributed location method, it is not necessary to which main website is participated in, adaptability is wide.
(3) adopt fault-signal Self-synchronous algorithm during operation with closed ring, simple, low cost and easy to implement.
In a word, after line failure, suitable excessively stream can be selected according to the real-time network structure adaptive of system
Fault Locating Method, and distributed algorithm is adopted, main website participation is not required to, locating speed is fast, improves the power supply reliability of system.
Claims (2)
1. it is a kind of based on STU recognize network topologies self adaptation over current fault localization method, it is characterised in that including as follows
Step：
Step 1, master control STU set up the network real-time topology structure of system by inquiry mode step by step, and are opened up according to network in real time
Flutter structure decision system and be presently at single supply power supply state or multiple feed state；
Step 2, master control STU, if single supply is powered then are entered according to the adaptively selected corresponding fault location flow process of power supply state
Enter single supply fault location flow process, if multiple feed, then into many power failure positioning flows, wherein,
Single supply fault location flow process is concretely comprised the following steps：
Started using the Sudden Changing Rate of transient zero-sequence current from control STU, and communicated from control STU with adjacent upon actuation, obtained
Take the fault current information of adjacent switch；If adjacent switch detects fault current, failure is not in the section of the adjacent switch
On；If adjacent switch is not detected by fault current or no adjacent switch, failure is on the section of adjacent switch；
Many power failure positioning flows are concretely comprised the following steps：
Started using difference of phase currents from control STU, and the first catastrophe point for detecting is calculated into fault current as from control STU
Phase place starting point, failure occur after, respectively from control STU according to mutation current detect fault-signal, and write down receive failure letter
Number moment, and on the basis of this moment calculate fault current real-time phase, then by the phase place starting point of fault current with it is real-time
Phase place is compared calculating；If there is two adjacent phase contrasts for comparing calculating from control STU to be 180 °, failure is in two phases
It is adjacent from the section between control STU；If the phase contrast for comparing calculating from control STU is 0 °, with this from the control adjacent sections of STU
Upper no failure.
2. the self adaptation over current fault localization method that network topologies are recognized based on STU according to claim 1, which is special
Levy and be, in step 2, when being started using difference of phase currents from control STU, the computing formula of difference of phase currents is：
In formula,For difference of phase currents,For the phase current sampling value of K points,It is the electricity that 1 cycle forward is lighted from K
Stream sampled value, N is the sampled point of every frequency cycle,It is the current sampling data that 2 cycles forward are lighted from K；WhenWhen, IsetSudden Changing Rate for setting starts threshold value, then start from control STU.
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| CN107134787A (en) * | 2017-06-23 | 2017-09-05 | 国网江苏省电力公司电力科学研究院 | Urgent accurate cutting load control system and cutting load method based on distributed feeder automation |
| CN108226710A (en) * | 2017-12-29 | 2018-06-29 | 中国电力科学研究院有限公司 | A kind of transmission line parameter discrimination method and system |
| CN108548987A (en) * | 2017-10-31 | 2018-09-18 | 国网江苏省电力公司扬州供电公司 | Active power distribution network Fault Locating Method based on current phase variation |
| CN110350516A (en) * | 2019-06-21 | 2019-10-18 | 广东电网有限责任公司 | A kind of high voltage distribution network Single-ring network topology automatic identification method |
| CN112782528A (en) * | 2020-12-31 | 2021-05-11 | 西安理工大学 | Power distribution network fault section positioning method using PMU |
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| CN112782528A (en) * | 2020-12-31 | 2021-05-11 | 西安理工大学 | Power distribution network fault section positioning method using PMU |
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