CN109510180A - A kind of fault recognition method based on route two sides positive sequence voltage - Google Patents
A kind of fault recognition method based on route two sides positive sequence voltage Download PDFInfo
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- CN109510180A CN109510180A CN201811349652.0A CN201811349652A CN109510180A CN 109510180 A CN109510180 A CN 109510180A CN 201811349652 A CN201811349652 A CN 201811349652A CN 109510180 A CN109510180 A CN 109510180A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
-
- 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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
A kind of fault recognition method based on route two sides positive sequence voltage, the method calculate route two sides positive sequence voltage using voltage transformer and current transformer acquisition false voltage and fault current；Meter and positive sequence voltage calculate error and mutual inductor progress of disease error, determine that Protection criteria acts setting valve；By comparing the difference of route two sides positive sequence voltage and the size of setting valve, determine that failure is troubles inside the sample space or external area error.The method of the present invention can quickly identify internal fault external fault for any fault type, be effectively guaranteed the selectivity and sensitivity of distribution protection；The realization condition of this method only need to indulge connection road based on existing conventional both-end and communicate to the sampled value of route two sides, carry out multiterminal synchronous communication to the output electric current of each access power supply without increasing additional vertical connection road, improve economic power system.
Description
Technical field
The present invention relates to a kind of fault recognition methods based on route two sides positive sequence voltage, belong to electric power network technique field.
Background technique
After distribution network line is using power supplys such as distribution mode access photovoltaic, blower, gas electricity generators, active distribution is formd
Net, fault characteristic and the single-ended power distribution network significant difference of tradition, common three-stage overcurrent protection exist selective and sensitive
Property insufficient problem, especially can not quickly and accurately three-phase symmetrical short circuit in cog region.However, it is this for three-phase shortcircuit most
For serious fault type, failure can instantaneously be cut off by often requiring that, reduce failure to the security risk of equipment and power grid.
Summary of the invention
The object of the present invention is to the fault identification of the active power distribution network in order to solve the problems, such as access distributed generation resource formation,
It is proposed a kind of fault recognition method based on route two sides positive sequence voltage.
The technical solution that the present invention realizes is as follows, a kind of fault recognition method based on route two sides positive sequence voltage, described
Method calculates route two sides positive sequence voltage using voltage transformer and current transformer acquisition false voltage and fault current；Meter
And positive sequence voltage calculates error and mutual inductor progress of disease error, determines that Protection criteria acts setting valve；By comparing route two sides
The difference of positive sequence voltage and the size of setting valve determine that failure is troubles inside the sample space or external area error.
It the described method comprises the following steps:
(1) pass through the side M false voltage U in voltage measuring transformer route MNMf, and calculate maximum short circuit current IK,maxWith
The maximum current I of jth platform power supply outputGj,max；Line fault electric current I is measured by current transformerfCalculate positive sequence voltage
(2) it calculates and maximum pressure drop caused by error is calculated as electric power outputting current:
Wherein, j indicates power supply number；KtIt indicates the error coefficient that voltage calculates, generally takes 5%；IGj,maxIndicate jth platform
The maximum current of power supply output；ZiFor the line impedance between power supply i and power supply i+1；
(3) maximum unbalance voltage is calculated:
ΔUumb.max=Ke.PTKs.PTUMf+Ke.CTKs.CT|IK.maxZMN|, wherein Ke.PTAnd Ke.CTIt is mutual to be expressed as voltage
The error coefficient of sensor and current transformer；Ks.PTAnd Ks.CTIt is expressed as the homotype system of voltage transformer and current transformer
Number；UMfIndicate the measurement voltage of the side route M when failure；IK.maxIt is expressed as maximum short circuit current；ZMNIt is expressed as the impedance of route MN
Value；
(4) setting valve is determined:
ΔUset=Krel(ΔUG.max+ΔUumb.max), wherein Δ UG.maxMaximum pressure drop when for output power of power supply, Δ
Uumb.maxFor maximum unbalance voltage, safety factor KrelTake 1.1；
(5) by failure criterionDetermine that failure is troubles inside the sample space or external area error, expires
Sufficient failure criterion is then troubles inside the sample space, is otherwise external area error.
The invention has the advantages that the present invention proposes a kind of fault recognition method based on route two sides positive sequence voltage,
This method can quickly identify internal fault external fault for any fault type, be effectively guaranteed distribution protection selectivity and
Sensitivity；The method of the present invention only need to indulge connection road based on existing conventional both-end and communicate to the sampled value of route two sides, nothing
Additional vertical connection road need to be increased, multiterminal synchronous communication is carried out to the output electric current of each access power supply, improve electrical network economy
Property.
Detailed description of the invention
Fig. 1 is fault recognition method implementation flow chart of the present invention.
Fig. 2 is present system structure chart；
Fig. 3 is present system analogous diagram；
Fig. 4 is simulation result line chart of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.
Fig. 1 is the implementing procedure that the embodiment of the present invention carries out fault identification, the specific steps are as follows:
(1) pass through the side M false voltage U in voltage measuring transformer route MNMf, and calculate maximum short circuit current IK,maxWith
The maximum current I of jth platform power supply outputGj,max；Line fault electric current I is measured by current transformerf, by IfCalculate positive sequence voltage
(2) it calculates electric power outputting current and calculates maximum pressure drop caused by error
Wherein, j indicates power supply number；KtIt indicates the error coefficient that voltage calculates, generally takes 5%；IGj,maxIndicate jth platform
The maximum current of power supply output；ZiFor the line impedance between power supply i and power supply i+1；
(3) maximum unbalance voltage Δ U is calculatedumb.max=Ke.PTKs.PTUMf+Ke.CTKs.CT|IK.maxZMN|, wherein Ke.PTWith
Ke.CTIt is expressed as the error coefficient of voltage transformer and current transformer；Ks.PTAnd Ks.CTIt is expressed as voltage transformer
With the homotype coefficient of current transformer；UMfIndicate the measurement voltage of the side route M when failure；IK.maxIt is expressed as maximum short circuit current；
ZMNIt is expressed as the impedance value of route MN；
(4) setting valve Δ U is determinedset=Krel(ΔUG.max+ΔUumb.max), wherein Δ UG.maxWhen for output power of power supply
Maximum pressure drop, Δ Uumb.maxFor maximum unbalance voltage, safety factor KrelTake 1.1；
(5) by failure criterionDetermine that failure is troubles inside the sample space or external area error, expires
Sufficient failure criterion is then troubles inside the sample space, is otherwise external area error.
Fig. 2 is that extensive inverter accesses the system construction drawing after power distribution network.F breaks down in the area route MN, pushes away
Export the positive sequence voltage calculated value distribution characteristics of the side route M, the side N, it is found that when system normal operation or external area error,
The positive sequence voltage derived from the side M is equal to its positive sequence voltage derived from the side N；When external area error, two sides positive sequence voltage then not phase
Deng.
Fig. 3 is that system is verified in the emulation testing of 10kV active power distribution network, and the neutral point of power distribution network is isolated neutral system, in maximum
The capacity of system is 430MVA under permission mode.10kV outlet 2 is returned, and respectively Feeder1 and Feeder2, route 1 have accessed 3
Platform power supply, respectively PCC1、PCC2And PCC3.Line impedance is 0.28+j0.349 Ω/km, power supply PCC1、PCC2It is photovoltaic electric
Source, specified installed capacity are respectively 4MW, 3MW, power supply PCC3For wind-power electricity generation, specified installed capacity is respectively 1.5MW, verifying
4 abort situation of test setting, wherein f1 and f2 is troubles inside the sample space；And f3 and f4 is external area error, is located at route MN
Downstream and upstream, vertical voltage protection R1 and R2 has been respectively configured in the both ends route MN.
Fig. 4 be nominal output when difference transition resistance under internal fault external fault the simulation results line chart.By line chart
It can be seen that either two-phase short-circuit fault or three phase short circuit fault, f1 and f2 route two sides positive sequence voltage difference DELTA UMN1?
Greater than setting valve Δ Uset, and f3 and f4 route two sides positive sequence voltage difference DELTA UMN1Respectively less than setting valve Δ Uset.Therefore the present embodiment
Can correctly judge internal fault external fault, not constrained by fault type.
Claims (2)
1. a kind of fault recognition method based on route two sides positive sequence voltage, which is characterized in that the method is by comparing route
The difference of two sides positive sequence voltage and the size of setting valve determine that failure is troubles inside the sample space or external area error；The method includes
Following steps:
(1) pass through the side M false voltage U in the area voltage measuring transformer route MNMf, and calculate maximum short circuit current IK,maxAnd jth
The maximum current I of platform power supply outputGj,max；Line fault electric current I is measured by current transformerfCalculate positive sequence voltage
(2) it calculates and maximum pressure drop caused by error is calculated as electric power outputting current:
Wherein, j indicates power supply number；KtIt indicates the error coefficient that voltage calculates, generally takes 5%；IGj,maxIndicate that jth platform power supply is defeated
Maximum current out；ZiFor the line impedance between power supply i and power supply i+1；
(3) maximum unbalance voltage is calculated:
ΔUumb.max=Ke.PTKs.PTUMf+Ke.CTKs.CT|IK.maxZMN|, wherein Ke.PTAnd Ke.CTBe expressed as voltage transformer and
The error coefficient of current transformer；Ks.PTAnd Ks.CTIt is expressed as the homotype coefficient of voltage transformer and current transformer；UMf
Indicate the measurement voltage of the side route M when failure；IK.maxIt is expressed as maximum short circuit current；ZMNIt is expressed as the impedance value of route MN；
(4) setting valve is determined:
ΔUset=Krel(ΔUG.max+ΔUumb.max)；
Wherein, Δ UG.maxMaximum pressure drop when for output power of power supply, Δ Uumb.maxFor maximum unbalance voltage, safety factor
KrelTake 1.1；
(5) by failure criterionDetermine that failure is troubles inside the sample space or external area error, meets event
Hindering criterion is then troubles inside the sample space, is otherwise external area error.
2. a kind of fault recognition method based on route two sides positive sequence voltage according to claim 1, which is characterized in that institute
The area route MN is stated, the active power distribution network formed for access distributed generation resource.
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| CN201811349652.0A CN109510180A (en) | 2018-11-14 | 2018-11-14 | A kind of fault recognition method based on route two sides positive sequence voltage |
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| CN201811349652.0A CN109510180A (en) | 2018-11-14 | 2018-11-14 | A kind of fault recognition method based on route two sides positive sequence voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426913A (en) * | 2020-04-17 | 2020-07-17 | 南方电网科学研究院有限责任公司 | Fault positioning method and system based on positive sequence voltage distribution characteristics |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255292A (en) * | 2011-07-25 | 2011-11-23 | 西安交通大学 | High-voltage transmission line distance protection method based on parametric recognition |
| CN107104421A (en) * | 2017-04-13 | 2017-08-29 | 华南理工大学 | A kind of voltage longitudinal protection method of distribution network comprising inverse distributed power |
-
2018
- 2018-11-14 CN CN201811349652.0A patent/CN109510180A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255292A (en) * | 2011-07-25 | 2011-11-23 | 西安交通大学 | High-voltage transmission line distance protection method based on parametric recognition |
| CN107104421A (en) * | 2017-04-13 | 2017-08-29 | 华南理工大学 | A kind of voltage longitudinal protection method of distribution network comprising inverse distributed power |
Non-Patent Citations (1)
| Title |
|---|
| 韩博文等: "含逆变型分布式电源配电网的新型纵联保护方案", 《高电压技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426913A (en) * | 2020-04-17 | 2020-07-17 | 南方电网科学研究院有限责任公司 | Fault positioning method and system based on positive sequence voltage distribution characteristics |
| CN111426913B (en) * | 2020-04-17 | 2021-07-27 | 南方电网科学研究院有限责任公司 | Fault positioning method and system based on positive sequence voltage distribution characteristics |
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