CN106385011B - A kind of fault coverage identification device of Intelligent region spare power automatic switching system and recognition methods - Google Patents
A kind of fault coverage identification device of Intelligent region spare power automatic switching system and recognition methods Download PDFInfo
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- CN106385011B CN106385011B CN201610850494.1A CN201610850494A CN106385011B CN 106385011 B CN106385011 B CN 106385011B CN 201610850494 A CN201610850494 A CN 201610850494A CN 106385011 B CN106385011 B CN 106385011B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
-
- 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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
Abstract
The invention discloses a kind of fault coverage identification device of Intelligent region spare power automatic switching system and recognition methods, it includes that station domain control sub-station and region control main website, acquisition and control unit are connect with station domain control sub-station, domain control sub-station of standing is connect with region control main website, recognition methods includes: switch trip event in pickup area prepared auto restart real-time detection region, judge whether to form decompression region, identifies power circuit breaker corresponding with decompression region；Each station domain control sub-station of region spare power automatic switching system detects the fault current direction of local measuring point；It is sent on acquired results are real-time to region and controls main website, region controls the real time information of all measuring points in main website collecting zone；Region controls the main website fault current Directional Sign synchronous according to the decompression region recognized and related measuring point, carries out fault coverage identification；Power grid is solved when no bus protection or protection overstepping, there are the technical problems such as very risky of He Zhong Library for the region spare power automatic switching system of the prior art.
Description
Technical field
The invention belongs to a kind of identifications of the fault coverage of technical field of electric power more particularly to Intelligent region spare power automatic switching system to fill
It sets and recognition methods.
Background technique
Automatic switching device of standby power supply is widely used in the power system, and it is reliable can not only to improve power grid power supply
Property, it can be run with simplified electrical network, limiting short-circuit current.There are close matching relationships with relay protection for prepared auto restart.Work as power grid
When fault trip decompression, backup auto-activating device needs whether Judging fault point is located at decompression bus bar side, if should then be latched prepared auto restart, keeps away
Exempt from backup power source He Zhong Library, expands power grid by secondary pulse even scope of power outage.
Prepared auto restart dress is mainly latched by bus differential protection, main transformer backup protection action signal in prepared auto restart design at present
It sets, but 110kV and following power grid Main connection form multiplicity, relay protection scheme simplify, when no bus protection or protection are bypassed the immediate leadership
When tripping, the risk of prepared auto restart He Zhong Library is still remained.For example, in 110kV power grid typical wiring figure shown in Fig. 2, area
It is interior there are two power supply point, to avoid electromagnetic looped network from running, regional power grid operation into two pieces, open loop point be located at switch BK6 with
BK10.When relay protection overstepping or when bus differential protection is not configured:
(1) f4 point short circuit on route 2,2 relay fail of route jump BK1 by 1 back-up protection of route and cut off failure.Region is standby
It will make switch BK6 He Zhong Library from throwing movement.
(2) bus differential protection is not configured in bus 3, if short trouble occurs for f2 point, jumps BK4 excision event by 2 back-up protection of route
Barrier.Prepared auto restart movement in region makes switch BK6 together in failure, causes 3 back-up protection BRKR Breaker BK8 of route, scope of power outage is caused to expand
Greatly.
Therefore, region prepared auto restart is reduced it is necessary to have the fault coverage identification function of independent and perfect to relay protection
Dependence.
Existing prepared auto restart technology generally comprises local prepared auto restart and two kinds of region prepared auto restart.Region prepared auto restart is main at present
It applies in 110kV and following power grid, decompression control object expands to district system, accurate fault coverage identification by bus of singly standing
It is particularly important.
Summary of the invention
The technical problem to be solved in the present invention: provide a kind of Intelligent region spare power automatic switching system fault coverage identification device and
Recognition methods, to solve
It solves due to Main connection form multiplicity in 110kV and following power grid, relay protection scheme simplifies, when no bus
Protection or protection overstepping when, using the region spare power automatic switching system of the prior art by then passing through bus differential protection, main transformer after
Standby protection signal is latched backup auto-activating device, can make prepared auto restart there are the risk of He Zhong Library, cause power grid by
The technical problems such as secondary pulse even scope of power outage expansion.
Technical solution of the present invention:
A kind of fault coverage identification device of Intelligent region spare power automatic switching system, it includes station domain control sub-station and region control
Main website, acquisition and control
Unit is connect with station domain control sub-station, and domain control sub-station of standing is connect with region control main website.
Domain control sub-station of standing is connect with region control main website by SDH transmission network.
A kind of fault coverage recognition methods of the fault coverage identification device of Intelligent region spare power automatic switching system, it is wrapped
It includes:
Switch trip event in step 1, pickup area prepared auto restart real-time detection region, judges whether to form decompression region,
Identify power circuit breaker corresponding with decompression region；
Step 2, region spare power automatic switching system each station domain control sub-station detect the fault current direction of local measuring point；
Step 3, each station domain control sub-station by step 1 and step 2 acquired results it is real-time on send to region and control main website, region
Control the real time information of all measuring points in main website collecting zone；
Step 4, region control main website the fault current direction sign synchronous according to the decompression region recognized and related measuring point
Will carries out fault coverage identification.
A kind of fault coverage recognition methods of the fault coverage identification device of Intelligent region spare power automatic switching system, it is wrapped
It includes:
Step 5 is done the fault point that step 4 recognizes and is isolated, and refreshes decompression region to be restored model after being isolated successfully
It encloses, prepared auto restart control is carried out to current recoverable decompression region.
Whether the method for discrimination in decompression region is formed described in step 1 are as follows: all breakers in system real-time judge region
And its position shape every knife
State establishes the real-time topology information of rack, according to real-time topology information to all adjacent switches of bus in region
Location status does combination and patrols
Collect and calculate: defining breaker and disconnecting logical value is 0, and being closed logical value is 1, is built using breaker logical variable composition
It is vertical to differentiate expression formula,
Expression formula result, which is 0, indicates decompression state, connected state is indicated for 1, according to this logic identification source in decompression
The bus of state, from
And obtain decompression region caused by failure.
The corresponding power circuit breaker in decompression region described in step 1 is fault trip branch road and the mistake for causing region decompression
Press side bus associated
Breaker.
The fault current direction of local measuring point described in step 2 obtains measurement method and includes:
Step 2.1, the measuring point that every breaker position in region is used as to fault current direction, are closed using measuring point
Join the three-phase electricity of bus
The three-phase current of pressure and breaker constitutes the sudden-change direction element at measuring point；
The reference direction of measuring point is defined as bus direction route by step 2.2；
Step 2.3, by than phase calculation formulaIt calculates than phase element measurement angle；
Step 2.4, by determining fault current direction than phase element measurement angle.
Fault coverage recognition methods described in step 4 includes:
Step 4.1 identifies whether there is not segregate fault point in decompression region to be restored first, when power circuit breaker is surveyed
The fault direction of point is flagged with opposite direction and when without positive direction, then has not segregate fault point in the region；
Step 4.2, no not segregate fault point, then carry out subsequent prepared auto restart and restore control；
Step 4.3 has not segregate fault point, then positions to fault point；To mistake as unit of bus and route
The fault direction mark of each measuring point is combined judgement in intermediate pressure section, when on bus the fault direction of relevant measuring point be flagged with
Opposite direction and when without positive direction, then determine that failure is located on this section of bus；When the fault direction mark of route two sides breaker measuring point
Will has positive direction and when without opposite direction mark, then determines that failure is located on this section of route.
Beneficial effects of the present invention:
The present invention is suitable for possessing the complicated power supply system of a variety of methods of operation, has the fault coverage identification of independent and perfect
Function is low to the dependence of relay protection.When recognizing has not segregate failure inside decompression region to be restored, region is standby
It is failure to actuate from throwing, or first positions isolated fault, the recoverable decompression region of reselection carries out prepared auto restart, it can be achieved that power grid accident
Comprehensive recovery control after power failure；It solves in 110kV and following power grid due to Main connection form multiplicity, relay protection scheme
Simplify, when no bus protection or protection overstepping, using the region spare power automatic switching system of the prior art by then passing through mother
Difference protection, main transformer backup protection action signal are latched backup auto-activating device, and prepared auto restart can be made there are the risk of He Zhong Library,
Cause power grid by technical problems such as secondary pulses even scope of power outage expansion.
Advantages of the present invention:
1. principle is simple and reliable, single failure in target grid can be accurately identified and be non-fully overlapped the position of combined failure
It sets；
2. region prepared auto restart is made to have the fault coverage identification function of independent and perfect, the dependence to relay protection is reduced
Property, help to realize the comprehensive recovery control after power grid accident has a power failure；
3. will not be started when normal based on the algorithm of fault component, do not influenced by load current, fault type；
4. fault component is not influenced by transition resistance, and sensitivity is guaranteed for direction algorithm.
Detailed description of the invention:
Fig. 1 is structure chart of the invention；
Fig. 2 is 110KV of embodiment of the present invention power grid typical wiring schematic diagram；
Fig. 3 is fault coverage of embodiment of the present invention identification process schematic diagram.
Specific embodiment
A kind of fault coverage identification device of Intelligent region spare power automatic switching system, it includes station domain control sub-station and region control
Main website, acquisition and control
Unit is connect with station domain control sub-station, and domain control sub-station of standing is connect with region control main website.
Domain control sub-station of standing is connect with region control main website by SDH transmission network.
Acquisition and control unit acquire the corresponding position of the switch and current-voltage information, and have switch control functions.
The device of the invention is based on real time information and a control main website and multiple controls is arranged using layered distribution type structure
System station has coordinated control and station domain control function, passes through 2Mbps dedicated optic fiber channel real-time, interactive between main website and each substation
Information.
A kind of fault coverage recognition methods of the fault coverage identification device of Intelligent region spare power automatic switching system, it is wrapped
It includes:
Switch trip event in step 1, pickup area prepared auto restart real-time detection region, judges whether to form decompression region,
Identify power circuit breaker corresponding with decompression region；
Whether the method for discrimination in decompression region is formed described in step 1 are as follows: by coordinated control system real-time judge region
All breakers and its location status every knife, establish the real-time topology information of rack, according to real-time topology to bus in region
The location status of all adjacent switches does combinational logic calculating: defining breaker and disconnecting logical value is 0, and closure logical value is 1, is adopted
It is formed to establish with breaker logical variable and differentiates expression formula, expression formula result, which is 0, indicates decompression state, indicates shape of networking for 1
State.Go out which bus is in decompression state according to this logic identification, to find decompression region caused by failure.
The corresponding power circuit breaker in decompression region described in step 1 is fault trip branch road and the mistake for causing region decompression
Press the associated breaker of side bus.Such as caused decompression region after f1 point failure protection jump BK1 in attached drawing 2, BK2 is its power supply
Breaker；Caused decompression region after BK5 is jumped in the protection of f2 point failure, and BK5 is its power circuit breaker.
Step 2, region spare power automatic switching system each station domain control sub-station detect the fault current direction of local measuring point；
The fault current direction of local measuring point described in step 2 obtains measurement method and includes:
Step 2.1, the measuring point that every breaker position in region is used as to fault current direction, are closed using measuring point
Join the three-phase electricity of bus
The three-phase current of pressure and breaker constitutes the sudden-change direction element at measuring point；
The reference direction of measuring point is defined as bus direction route by step 2.2；
Step 2.3, by than phase calculation formulaIt calculates than phase element measurement angle；
Step 2.4, by determining fault current direction than phase element measurement angle.
Specific implementation are as follows: every breaker position is used as the measuring point in fault current direction in region, uses
The three-phase current of three-phase voltage and breaker that measuring point is associated with bus constitutes the sudden-change direction element at measuring point.Specifically,
Every line-breaker is equivalent to a measuring point, and busbar breaker is two measuring points because being associated with two sections of buses, equivalent process, often
A measuring point is associated with one section of bus, is constituted directional element by this section of busbar voltage and with the electric current that this section of bus defines reference direction.
The reference direction of measuring point is defined as being directed toward route by bus.To simplify recognition strategy, each measuring point under different situations
Sudden-change direction element is all made of the form of formula (1), does not introduce current compensation.Due in 110kV system source impedance to route
The ratio between impedance will not be too small, and formula (1) can provide enough sensitivity to positive, reverse fault.
Kk=AB, BC, CA phase in formula,For line voltage Sudden Changing Rate,For difference of phase currents.
Provable, no matter how system operation mode and fault point change, the calculated angle of any survey knock type (1) is full
Sufficient following relationship:
For the sensitivity for improving directional element, following form can be improved to than phase mode:
Z in formula (3)dFor the equivalent impedance calculated according to representative network parameter, when making positive direction failure, measured than phase element
Angle is closer to 180 °, when reverse direction failure, than phase element measurement angle closer to 0 °.
Therefore, using this than phase mode, each measuring point calculates three than phase element, for the standard for guaranteeing measuring point direction discernment
True property, using two from three logic from three than in phase result determine measuring point fault direction value of statistical indicant.Value indicates failure point for 1
In the positive direction of measuring point, it is worth the opposite direction for being located at measuring point for -1 expression fault point, being worth indicates that fault current is not detected for 0.
When short trouble occurs for power grid, each substation captures the Sudden Changing Rate of fault moment, achievable fault direction in 2 cycles
Mark calculates, and mark result indicates after being eliminated by short circuit current signal broadening, short circuit to be returned.
Step 3, each station domain control sub-station by step 1 and step 2 acquired results it is real-time on send to region and control main website, region
Control the real time information of all measuring points in main website collecting zone；
Step 4, region control main website the fault current direction sign synchronous according to the decompression region recognized and related measuring point
Will carries out fault coverage identification.
Fault coverage recognition methods described in step 4 includes:
Step 4.1 identifies whether there is not segregate fault point in decompression region to be restored first, when power circuit breaker is surveyed
The fault direction of point is flagged with opposite direction and when without positive direction, then has not segregate fault point in the region；
Step 4.2, no not segregate fault point, then carry out subsequent prepared auto restart and restore control；
Step 4.3 has not segregate fault point, then positions to fault point；To mistake as unit of bus and route
The fault direction mark of each measuring point is combined judgement in intermediate pressure section, when on bus the fault direction of relevant measuring point be flagged with
Opposite direction and when without positive direction, then determine that failure is located on this section of bus；When the fault direction mark of route two sides breaker measuring point
Will has positive direction and when without opposite direction mark, then determines that failure is located on this section of route.
In this step, each measuring point Directional Sign used by main station failure range identifies is the synchronous faults of the whole network
The effective information of feature.Reason are as follows: for the 110kV regional power grid of radius of electricity supply 200km, 2Mbps channel transfer is delayed between standing
Generally less than 2ms.The 110kV short circuit malfunction mute time is generally higher than 80ms, therefore in 30ms before short trouble is cut off,
The equal Delivered main website of the Directional Sign of each substation.Main website records the fault direction information of each measuring point in real time when normal operation, is examining
Decompression area judging is started after measuring fault trip, after sentencing decompression region out according to trip event and related electric amount, reads and loses
Then fault direction mark of all measuring points before last circuit breaker trip when 30ms in intermediate pressure section carries out fault coverage knowledge
Not.Therefore each measuring point Directional Sign used by main station failure range identifies is effective letter of the synchronous faults feature of the whole network
Breath.
In this step, whether to be restored decompression region in have not segregate fault point, can pass through the mistake if identifying first
The fault direction mark of intermediate pressure section power circuit breaker measuring point is judged (when the fault direction of power circuit breaker measuring point is flagged with instead
Direction and when without positive direction, then be judged to have not segregate fault point in the region, otherwise fault-free point in area).
Recognition result is divided into Liang Ge branch:
(1) it if without not segregate fault point, carries out subsequent prepared auto restart and restores control；
(2) it if there is not segregate fault point, needs to position failure.Fault location need to be with bus, route member
Part is that unit is combined judgement to the fault direction mark of each measuring point in decompression region.When on bus relevant measuring point therefore
Barrier Directional Sign has opposite direction and when without positive direction, can determine that failure is located on this section of bus.When route two sides breaker measuring point
Fault direction be flagged with positive direction and when without opposite direction mark, can determine that failure is located on this section of route.Wherein, mother open circuit
Device is equivalent to two measuring points, and measuring point associated by selection target bus is judged in identification process.
Step 5 is done the fault point that step 4 recognizes and is isolated, and refreshes decompression region to be restored model after being isolated successfully
It encloses, prepared auto restart control is carried out to current recoverable decompression region.
In this step, it if failing to Fault Isolation, may be selected to terminate the prepared auto restart control to the decompression region.
Technical solution of the present invention is further understood that for the ease of those skilled in the art, in the present embodiment in conjunction with attached drawing
2 and 3, technical solution of the present invention is illustrated:
In 110kV typical case's electric network wiring scheme shown in Fig. 2, when f4 point short circuit on route 2, if 2 relay fail of route, route
1 back-up protection jumps BK1 and cuts off failure.Normal areas prepared auto restart can act, and make switch BK6 He Zhong Library.After applying the present invention,
Region prepared auto restart will do it fault identification, detect in decompression region (bus 1,2,3) there is not segregate fault point (f4), into
And judge that failure is located on route 2 according to testing result (the fault direction value of statistical indicant of measuring point BK4, BK5 are 1), to failure
Point is isolated, tripping BK5, refreshes decompression regional scope (bus 3) to be restored, and last combination switch BK6 carries out prepared auto restart, is restored
Bus 3 is powered.
There is the risk that multiple short trouble occurs in succession in actual electric network, it is same that failure process can be subdivided into multiple failures
The overlap period of Shi Fasheng and the non-overlap phase individually occurred.Inverse transition amount when the present invention algorithmically eliminates failure vanishes
It influences, the differentiation to single failure can be equivalent in the non-overlap phase, fault direction can be accurately judged to.In overlap period,
The calculating network of direction element can be equivalent to the superposition of the failure additional supply of different type different location.According to fault point with
Combined failure is divided into, heteropleural two kind situations ipsilateral positioned at measuring point by the relative position of measuring point.Below two failures to occur simultaneously
For, analyze the discriminating direction result in various situations at measuring point:
(1) when combined failure be located at measuring point it is ipsilateral when, no matter fault type and distance, calculate impartial in network
Effect is the ipsilateral additional supply of measuring point, and the electric current at measuring point is the superposition of equidirectional electric current, and directional element can accurate Judging fault
Direction；
(2) it when combined failure is located at measuring point heteropleural, calculates and is equivalent to the additional supplies of measuring point two sides in network, at this time two
Branch where the voltage's distribiuting of network, measuring point is equal to the diverting coefficient of failure additional supply after separate, the previous failure of secondary failure
Overlay is had an impact, the differentiation result of directional element will be unable to the position of accurate response fault point.
When heteropleural phase fault of the same name, if measuring point branch is identical to the diverting coefficient of two additional supplies, superimposed electricity
Stream is approximately equal to load current, and directional element sentences fault-free out at this time, and the failure of opposite direction will be unable to be identified, and receiving end is surveyed
There is the risk for bus-bar fault of failing to judge in point.
When heteropleural out-phase grounding fault, superimposed fault component direction character is complex at measuring point, with single-phase earthing event
It is analyzed for barrier receiving end measuring point.If F point is located at measuring point positive direction, R point is located at measuring point opposite direction, F in super-imposed networks
Equivalent impedance at point, R point is respectively ZS、Z'S, k2Mutually lag behind k12 π/3 of phase.F point k1Mutually ground connection while R point k2Mutually ground connection, F
Point k2Mutually ground connection while R point k1Mutually in the case of two kinds of ground connection, k1k2The measurement result of alternate directional element is denoted as Z respectively2r、Z2f, such as
Shown in formula (6), formula (7).
P=Z' in formula (6), formula (7)S/ZS。For (k1 phase, k2 phase) phase voltage Sudden Changing Rate.Receiving end measuring point three
A directional element is as shown in table 1 in the measurement result that singlephase earth fault occurs simultaneously for F point, R point, wherein argZS、argZ′S∈
(0,π/2)。
Directional element measurement result when 1 combined failure of table
Assuming that the impedance angle of circuit element is not much different in network, then ZS、Z'SImpedance angle be believed that it is approximately equal, for
Receiving end measuring point has ZS>Z'SAnd Z'SIt is approximately equal to system impedance, i.e. 0 < p < 1 and the < of π/3 argZ 'S< pi/2 then can have formula (8) into one
Shown relationship.
Z can be obtained according to formula (8)2r、Z2fImpedance angular region such as formula (9) shown in.
Measurement impedance using 3 it is found that take 2 logical process that can obtain than phase result according to shown in formula (9) and table 1: as F point k1
Mutually ground connection and R point k2When being mutually grounded, differentiate that result is that failure is located at opposite direction；As F point k2Mutually ground connection and R point k1When being mutually grounded, sentence
Other result is that failure is located at positive direction, shows the superimposed direction character reflection lag phase fault position of combined failure
Rule.Therefore, receiving end measuring point equally exists the risk of reverse direction failure of failing to judge when heteropleural out-phase grounding fault.
Therefore, region prepared auto restart fault coverage identification function of the present invention can be worked as that can accurately identify in the non-overlap phase
Prior fault point, but it cannot be guaranteed that all position of failure point of identification in combined failure overlap period.Due to event compound in actual use
The completely overlapped probability of barrier process is very low, and will also open overcurrent protection in short-term after prepared auto restart combined floodgate, small probability event
Risk further decreases.Therefore, which substantially meets application request.
Claims (6)
1. a kind of fault coverage recognition methods of the fault coverage identification device of Intelligent region spare power automatic switching system, described device include
Stand domain control sub-station and region control main website, acquisition and control unit with stand domain control sub-station connect, stand domain control sub-station and area
Domain controls main website connection；It is characterized by: the fault coverage recognition methods includes:
Switch trip event in step 1, pickup area prepared auto restart real-time detection region, judges whether to form decompression region, identification
Power circuit breaker corresponding with decompression region；
Step 2, region spare power automatic switching system each station domain control sub-station detect the fault current direction of local measuring point；
Step 3, each station domain control sub-station by step 1 and step 2 acquired results it is real-time on send to region and control main website, region control
The real time information of all measuring points in main website collecting zone；
Step 4, region control main website the fault current Directional Sign synchronous according to the decompression region recognized and related measuring point, into
The identification of row fault coverage；
The fault current direction of local measuring point described in step 2 obtains measurement method and includes:
Step 2.1, the measuring point that every breaker position in region is used as to fault current direction are associated with female using measuring point
The three-phase voltage of line and the three-phase current of breaker constitute the sudden-change direction element at measuring point；
The reference direction of measuring point is defined as bus direction route by step 2.2；
Step 2.3, by than phase calculation formulaIt calculates than phase element measurement angle；In formula:For line
Voltage jump amount,For difference of phase currents, ZdFor the equivalent impedance calculated according to representative network parameter；
Step 2.4, by determining fault current direction than phase element measurement angle.
2. a kind of fault coverage of the fault coverage identification device of Intelligent region spare power automatic switching system according to claim 1 is known
Other method, it is characterised in that: domain control sub-station of standing is connect with region control main website by SDH transmission network.
3. a kind of fault coverage of the fault coverage identification device of Intelligent region spare power automatic switching system according to claim 1 is known
Other method, it includes:
Step 5 is done the fault point that step 4 recognizes and is isolated, and refreshes decompression regional scope to be restored after being isolated successfully, right
Current recoverable decompression region carries out prepared auto restart control.
4. a kind of fault coverage of the fault coverage identification device of Intelligent region spare power automatic switching system according to claim 1 is known
Other method, it includes: that the method for discrimination in decompression region whether is formed described in step 1 are as follows: is owned in system real-time judge region
Breaker and its location status every knife, establish the real-time topology information of rack, according to real-time topology information to bus in region
The location status of all adjacent switches does combinational logic calculating: defining breaker and disconnecting logical value is 0, and closure logical value is 1, is adopted
It is formed to establish with breaker logical variable and differentiates expression formula, expression formula result, which is 0, indicates decompression state, indicates shape of networking for 1
State, according to this logic identification source in the bus of decompression state, to obtain decompression region caused by failure.
5. a kind of fault coverage of the fault coverage identification device of Intelligent region spare power automatic switching system according to claim 1 is known
Other method, it includes: that the corresponding power circuit breaker in decompression region described in step 1 is the fault trip branch for causing region decompression
The upper and associated breaker of decompression side bus.
6. a kind of fault coverage of the fault coverage identification device of Intelligent region spare power automatic switching system according to claim 1 is known
Other method, it includes: that fault coverage recognition methods described in step 4 includes:
Step 4.1 identifies whether there is not segregate fault point in decompression region to be restored first, when power circuit breaker measuring point
Fault direction is flagged with opposite direction and when without positive direction, then has not segregate fault point in the region；
Step 4.2, no not segregate fault point, then carry out subsequent prepared auto restart and restore control；
Step 4.3 has not segregate fault point, then positions to fault point；To decompression area as unit of bus and route
The fault direction mark of each measuring point is combined judgement in domain, when on bus the fault direction of relevant measuring point be flagged with negative side
To and without positive direction when, then determine that failure is located on this section of bus；When the fault direction of route two sides breaker measuring point is flagged with
Positive direction and when without opposite direction mark, then determine that failure is located on this section of route.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN109191006B (en) * | 2018-09-28 | 2021-08-10 | 广东电网有限责任公司 | Method for automatically scanning and analyzing risk of N-1 of 110kV main transformer of power grid |
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| CN103151842B (en) * | 2013-03-18 | 2015-03-25 | 国家电网公司 | Hierarchical protection control system facing regional power grid |
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