CN106786428B - A kind of transmission line distance protecting method and device containing SSSC - Google Patents
A kind of transmission line distance protecting method and device containing SSSC Download PDFInfo
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- CN106786428B CN106786428B CN201710110041.XA CN201710110041A CN106786428B CN 106786428 B CN106786428 B CN 106786428B CN 201710110041 A CN201710110041 A CN 201710110041A CN 106786428 B CN106786428 B CN 106786428B
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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
Abstract
The present invention relates to a kind of transmission line distance protecting method and device containing SSSC; the described method includes: determining the operating condition of SSSC after line fault according to the bypass IGBT group signal of SSSC and bypass breaker position contact point signal, and determine SSSC capacitive compensation distance protection setting coefficient and SSSC inductive compensation distance protection setting coefficient；According to the operating condition of SSSC, and determine using the measurement impedance of line impedance relay, SSSC capacitive compensation distance protection setting coefficient or SSSC inductive compensation distance protection setting coefficient the distance protection criterion of line impedance relay；Technical solution provided by the invention; comprehensively consider SSSC main body protection and route distance protection; the movement definite value section that route distance protection is determined according to the operating condition of SSSC, so that distance protection Reliability of Microprocessor and accuracy increase when the transmission line of electricity containing SSSC breaks down.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System fields, and in particular to a kind of transmission line of electricity distance guarantor containing SSSC
Maintaining method and device.
Background technique
Flexible AC transmitting system (Flexible alternating current based on power electronic technique
Transmission system, FACTS) pass through quickly connecting to network voltage, line impedance, phase angle and power flow
It is continuous to adjust, the transmission line capability of route and the maintenance level of electric system are increased substantially, is effective control of electric power system tide
Provide a kind of advanced and economic solution.
SSSC is a kind of novel controllable series compensator, and as a member in FACTS family, it, which is used, is based on to close
The voltage source converter technology of disconnected device is transmitted electricity by injection one voltage source orthogonal with line current, that amplitude is controllable to change
The equivalent impedance of route.With power flowcontrol ability, strong, fast response time, compensation ability are not influenced SSSC by line current size
The features such as, adding control appropriate can be with power oscillation damping or inhibition subsynchronous resonance.
In order to ensure the alternating current circuit safe and stable operation containing SSSC, asked for the relay protection after SSSC access system
Topic research is a very necessary research direction.On the one hand, SSSC is similar with other string complement systems, can not keep away after access system
That exempts from changes line parameter circuit value, has adverse effect on to route protection；On the other hand, the topological structure of SSSC is increasingly complex,
The movement of main body protection increases the difficulty and complexity of route protection analysis during failure.
Summary of the invention
The present invention provides a kind of transmission line distance protecting method and device containing SSSC, can the purpose is to provide one kind
The method for comprehensively considering SSSC main body protection and route distance protection, it is ensured that distance is protected when the transmission line of electricity containing SSSC breaks down
Protect reliable precision maneuver.
The purpose of the present invention is adopt the following technical solutions realization:
A kind of transmission line distance protecting method containing SSSC, it is improved in that including:
After determining line fault according to the bypass IGBT group signal of SSSC and bypass breaker position contact point signal
The operating condition of SSSC, and determine SSSC capacitive compensation distance protection setting coefficient and SSSC inductive compensation distance protection setting system
Number；
It is protected according to the operating condition of SSSC, and using the measurement impedance of line impedance relay, SSSC capacitive compensation distance
Shield tuning coefficient or SSSC inductive compensation distance protection setting coefficient determine the distance protection criterion of line impedance relay.
Preferably, described that line is determined according to the bypass IGBT group signal and bypass breaker position contact point signal of SSSC
The operating condition of SSSC after the failure of road, comprising:
If the bypass thyristor Triggerless of the SSSC and bypass breaker of SSSC is in closing position, the fortune of SSSC
Row operating condition is stoppage in transit state；
If the bypass thyristor of SSSC has the bypass breaker of trigger signal and SSSC to be in open position, the fortune of SSSC
Row operating condition is main body protection quick acting state；
If the bypass thyristor Triggerless of the SSSC and bypass breaker of SSSC is in open position, the fortune of SSSC
Row operating condition is main body protection non-action state.
Preferably, the operating condition according to SSSC, and utilize the measurement impedance of line impedance relay, SSSC capacitive
Uncompensation distance protection seting coefficient or SSSC inductive compensation distance protection setting coefficient determine that the distance of line impedance relay is protected
Protect criterion, comprising: if the operating condition of SSSC is stoppage in transit state, the distance protection criterion of line impedance relay includes: to work as |
Zm|≤|Zset1| when, Location is located in protection zone, when | Zm| > | Zset1|, Location is located at protection zone
It is overseas, wherein ZmFor the measurement impedance of line impedance relay, Zset1The protection definite value of protected circuit when being compensated for no SSSC.
Preferably, the operating condition according to SSSC, and utilize the measurement impedance of line impedance relay, SSSC capacitive
Uncompensation distance protection seting coefficient or SSSC inductive compensation distance protection setting coefficient determine that the distance of line impedance relay is protected
Protect criterion, comprising: if the operating condition of SSSC is main body protection quick acting state, the distance protection of line impedance relay
Criterion includes: to work as | Zm|≤|Zset2| when, Location is located in protection zone, when | Zm| > | Zset2|, line fault position
Outside setting in protection zone, wherein ZmFor the measurement impedance of line impedance relay, Zset2To consider the equivalent of coupling transformer
The protection definite value of protected circuit when leakage reactance.
Further, the protection definite value of protected circuit when determining the equivalent leakage reactance for considering coupling transformer as the following formula
Zset2:
Zset2=Zset1+ZB
In above formula, Zset1The protection definite value of protected circuit, Z when being compensated for no SSSCBFor the equivalent leakage of coupling transformer
It is anti-.
Preferably, the operating condition according to SSSC, and utilize the measurement impedance of line impedance relay, SSSC capacitive
Uncompensation distance protection seting coefficient or SSSC inductive compensation distance protection setting coefficient determine that the distance of line impedance relay is protected
Protect criterion, comprising:
If the operating condition of SSSC is main body protection non-action state, the distance protection criterion packet of line impedance relay
It includes:
When SSSC is in capacitive compensation mode and kc|Zm|≤|Zset1| when, Location is located in protection zone, when
SSSC is in capacitive compensation mode and kc|Zm| > | Zset1|, Location is located at outside protection zone, wherein ZmFor route
The measurement impedance of impedance relay, Zset1The protection definite value of protected circuit, k when being compensated for no SSSCcFor SSSC capacitive compensation away from
From protection seting coefficient；
When SSSC is in inductive compensation mode and kl|Zm|≤|Zset1| when, Location is located in protection zone, when
SSSC is in inductive compensation mode and kl|Zm| > | Zset1|, Location is located at outside protection zone, wherein ZmFor route
The measurement impedance of impedance relay, Zset1The protection definite value of protected circuit, k when being compensated for no SSSClFor SSSC inductive compensation away from
From protection seting coefficient.
Preferably, SSSC capacitive compensation distance protection setting coefficient k is determined as the following formulac:
In above formula, α is that bus is powered on bus to fault point line impedance to the actual voltage drop phasor of fault point route
The angle of pressure drop phasor, β are the angle that electric current phasor and short circuit current phasor are measured at bus, and θ is that electric current phase is measured at bus
The angle of amount and bus to the actual voltage drop phasor of fault point route, μ are that electric current is measured at faulted phase current phasor and bus
Phasor, λ are measurement electric current phasor and the angle that voltage phasor is measured at bus at bus；
SSSC inductive compensation distance protection setting coefficient k is determined as the following formulal:
A kind of Distance Protection Device containing SSSC, it is improved in that described device includes:
First determining module, for the bypass IGBT group signal and bypass breaker position contact point signal according to SSSC
It determines the operating condition of SSSC after line fault, and determines SSSC capacitive compensation distance protection setting coefficient and SSSC inductive compensation
Distance protection setting coefficient；
Second determining module, for the operating condition according to SSSC, and using the measurement impedance of line impedance relay,
SSSC capacitive compensation distance protection setting coefficient or SSSC inductive compensation distance protection setting coefficient determine line impedance relay
Distance protection criterion.
Preferably, first determining module, comprising: the first determination unit is used for:
If the bypass thyristor Triggerless of the SSSC and bypass breaker of SSSC is in closing position, the fortune of SSSC
Row operating condition is stoppage in transit state；
If the bypass thyristor of SSSC has the bypass breaker of trigger signal and SSSC to be in open position, the fortune of SSSC
Row operating condition is main body protection quick acting state；
If the bypass thyristor Triggerless of the SSSC and bypass breaker of SSSC is in open position, the fortune of SSSC
Row operating condition is main body protection non-action state.
Preferably, second determining module, comprising:
Second determination unit, if the operating condition for SSSC is stoppage in transit state, the distance of line impedance relay is protected
Protecting criterion includes: to work as | Zm|≤|Zset1| when, Location is located in protection zone, when | Zm| > | Zset1|, line fault
Position is located at outside protection zone, wherein ZmFor the measurement impedance of line impedance relay, Zset1It is protected when being compensated for no SSSC
The protection definite value of route.
Preferably, second determining module, comprising:
Third determination unit, if for SSSC operating condition be main body protection quick acting state, line impedance after
The distance protection criterion of electric appliance includes: to work as | Zm|≤|Zset2| when, Location is located in protection zone, when | Zm| > |
Zset2|, Location is located at outside protection zone, wherein ZmFor the measurement impedance of line impedance relay, Zset2To consider
The protection definite value of protected circuit when the equivalent leakage reactance of coupling transformer.
Preferably, the protection definite value Z of protected circuit when determining the equivalent leakage reactance for considering coupling transformer as the following formulaset2:
Zset2=Zset1+ZB
In above formula, Zset1The protection definite value of protected circuit, Z when being compensated for no SSSCBFor the equivalent leakage of coupling transformer
It is anti-.
Preferably, second determining module, comprising:
4th determination unit, if the operating condition for SSSC is main body protection non-action state, line impedance relay
The distance protection criterion of device includes:
When SSSC is in capacitive compensation mode and kc|Zm|≤|Zset1| when, Location is located in protection zone, when
SSSC is in capacitive compensation mode and kc|Zm| > | Zset1|, Location is located at outside protection zone, wherein ZmFor route
The measurement impedance of impedance relay, Zset1The protection definite value of protected circuit, k when being compensated for no SSSCcFor SSSC capacitive compensation away from
From protection seting coefficient；
When SSSC is in inductive compensation mode and kl|Zm|≤|Zset1| when, Location is located in protection zone, when
SSSC is in inductive compensation mode and kl|Zm| > | Zset1|, Location is located at outside protection zone, wherein ZmFor route
The measurement impedance of impedance relay, Zset1The protection definite value of protected circuit, k when being compensated for no SSSClFor SSSC inductive compensation away from
From protection seting coefficient.
Preferably, first determining module, comprising:
5th determination unit, for determining SSSC capacitive compensation distance protection setting coefficient k as the following formulac:
In above formula, α is that bus is powered on bus to fault point line impedance to the actual voltage drop phasor of fault point route
The angle of pressure drop phasor, β are the angle that electric current phasor and short circuit current phasor are measured at bus, and θ is that electric current phase is measured at bus
The angle of amount and bus to the actual voltage drop phasor of fault point route, μ are that electric current is measured at faulted phase current phasor and bus
Phasor, λ are measurement electric current phasor and the angle that voltage phasor is measured at bus at bus；
SSSC inductive compensation distance protection setting coefficient k is determined as the following formulal:
Beneficial effects of the present invention:
Technical solution provided by the invention comprehensively considers SSSC main body protection and route distance protection, according to the fortune of SSSC
Row operating condition determines the movement definite value section of route distance protection, so that distance protection acts when the transmission line of electricity containing SSSC breaks down
Reliability and accuracy increase, meanwhile, utilize the bypass IGBT group signal and bypass breaker position contact of SSSC
Signal judges the operating condition of SSSC, enables the method to be achieved and apply in practical projects, works as line fault
When SSSC main body protection is not operating, introduces SSSC output voltage signal and constitute new distance protection criterion, can well solve
SSSC difference compensation model and compensativity, which are adjusted the distance, protects the problem of influencing.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the transmission line distance protecting method containing SSSC of the present invention；
Fig. 2 is SSSC autoprotection measure schematic diagram in the embodiment of the present invention；
Fig. 3 is the transmission line malfunction system equivalent structure schematic diagram in the embodiment of the present invention containing SSSC；
Fig. 4 is the transmission line malfunction equivalent circuit schematic diagram in the embodiment of the present invention containing SSSC；
Fig. 5 is voltage and current phasor diagram when compensating in the embodiment of the present invention without SSSC；
Voltage and current phasor diagram when Fig. 6 is SSSC capacitive compensation in the embodiment of the present invention；
Voltage and current phasor diagram when Fig. 7 is SSSC inductive compensation in the embodiment of the present invention；
Fig. 8 is a kind of structural schematic diagram of the Distance Protection Device containing SSSC of the present invention.
Specific embodiment
It elaborates with reference to the accompanying drawing to a specific embodiment of the invention.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
A kind of transmission line distance protecting method containing SSSC provided by the invention, as shown in Figure 1, comprising:
101. determining line fault according to the bypass IGBT group signal of SSSC and bypass breaker position contact point signal
The operating condition of SSSC afterwards, and determine SSSC capacitive compensation distance protection setting coefficient and SSSC inductive compensation distance protection setting
Coefficient；
102. according to the operating condition of SSSC, and using the measurement impedance of line impedance relay, SSSC capacitive compensation away from
From the distance protection criterion that protection seting coefficient or SSSC inductive compensation distance protection setting coefficient determine line impedance relay.
Specifically, in the step 101, SSSC autoprotection measure schematic diagram is as shown in Fig. 2, after line fault, if other
Road thyristor Triggerless, bypass breaker combined floodgate i.e. position contact point signal may determine that SSSC is constantly in stoppage in transit shape for 0
State；
If it is 1 that bypass thyristor, which has trigger signal, bypass breaker separating brake i.e. position contact point signal, it can be determined that SSSC sheet
Body protection act, protection act outlet is quick lock inverter and triggers bypass turn on thyristors, only couples transformation at this time
Device equivalent leakage reactance series connection line attachment operation, SSSC adjust the distance protection influence be mainly coupling transformer equivalent leakage reactance；
If bypass thyristor Triggerless, bypass breaker separating brake, that is, position contact point signal may determine that SSSC sheet for 1
Body protection is not operating, and the adjust the distance influence of protection of SSSC at this time is mainly output voltage.
Therefore, if the bypass thyristor Triggerless of the SSSC and bypass breaker of SSSC is in closing position,
The operating condition of SSSC is stoppage in transit state；
If the bypass thyristor of SSSC has the bypass breaker of trigger signal and SSSC to be in open position, the fortune of SSSC
Row operating condition is main body protection quick acting state；
If the bypass thyristor Triggerless of the SSSC and bypass breaker of SSSC is in open position, the fortune of SSSC
Row operating condition is main body protection non-action state.
Wherein, SSSC capacitive compensation distance protection setting coefficient k is determined as the following formulac:
In above formula, α is that bus is powered on bus to fault point line impedance to the actual voltage drop phasor of fault point route
The angle of pressure drop phasor, β are the angle that electric current phasor and short circuit current phasor are measured at bus, and θ is that electric current phase is measured at bus
The angle of amount and bus to the actual voltage drop phasor of fault point route, μ are that electric current is measured at faulted phase current phasor and bus
Phasor, λ are measurement electric current phasor and the angle that voltage phasor is measured at bus at bus；
SSSC inductive compensation distance protection setting coefficient k is determined as the following formulal:
Wherein, in application scenarios as shown in Figure 3, F point is fault point, and P point is distance protection setting range boundary point,
Z indicates line impedance of the fault point to bus M, ZsetThe adjusting impedance for indicating distance protection, in application scenarios as shown in Figure 4
In, ZSAnd ZRRespectively indicate power supply ESAnd ERInternal impedance, Z indicates the line impedance of fault point F to bus M, and the fault point Z' F arrives
The line impedance of bus N, RgIndicate transition resistance.SSSC is equivalent to controllable voltage source, and injecting voltage is
Based on above-mentioned scene, voltage and current phasor diagram when building is without SSSC compensation, as shown in figure 5, considering SSSC maintenance
The voltage and current phasor diagram of failure system when stoppage in transit.
In Fig. 5,Indicate the measurement voltage phasor at bus M Indicate the voltage phasor of fault point F It indicates
Bus M is to the corresponding voltage drop of fault point F line impedance Z, i.e.,R indicates that impedance Z corresponds to resistance, and X indicates impedance Z
Corresponding reactance, i.e. Z=R+jX.WithIt respectively indicates measurement electric current at bus M, measure electric current and fault point electricity at bus N
Stream, andDue to transition resistance RgFor purely resistive, so fault point voltageWith electric currentSame-phase.It is measured at bus M
Electric currentWithAngle be line impedance angle θ, with measurement voltageAngle be λ, with short circuit currentAngle be β, with mother
Electric current is measured at line NAngle be ρ.OT was that O point makees phasorThe vertical line of extended line, intersection point T.Indicate impedance relay
The offset voltage of device can be learnt in conjunction with Fig. 4:Modulus value be measurement voltageWith measurement electric currentWith adjusting impedance ZsetMultiply
The difference of product, i.e.,
Voltage and current phasor diagram when Fig. 6 and 7 is respectively SSSC capacitive compensation and inductive compensation.In figure 6 and figure 7,Table
Show faulted phase current,WithRespectively indicate electric current phasorWithDirection, μ indicate electric current phasorWithPhase difference.Indicate the output voltage phasor of SSSCSSSC capacitive compensation in Fig. 6,It lags behindSSSC perception is mended in Fig. 7
It repays,It is ahead of Indicate voltage drop on bus M to fault point F line impedance Z, i.e., It indicates
To the actual voltage drop of fault point F route, α is indicated bus MWithAngle.Other each amounts are identical as Fig. 6.
When being in capacitive compensation for SSSC shown in fig. 6, in the middle foundation of Δ MFM 'WithBetween mathematical relationship,
Construct the distance protection criterion of SSSC capacitive compensation mode.In Δ OMF and Δ MFM ', ∠ MOF=λ+β, ∠ MFO=180 °-
(θ-alpha+beta), ∠ M ' MF=180 °-(90 ° of-θ+μ+α), ∠ MM ' F=90 °-θ+μ can be obtained:
It arranges availableWithBetween relationship be
According toWithThe voltage phasor both sides of expression are same to remove:
|Zm|=kc|Z|
Wherein kcFor SSSC capacitive compensation distance protection setting coefficient, and
The distance protection criterion of SSSC capacitive compensation mode can be constructed.
In the distance protection criterion of SSSC capacitive compensation mode, need first to solveWithAngle α.In Δ MFM '
In, it can be obtained using sine:
It is arranged according to above-mentioned formula:
Sin α=kαcsin(θ+β-α)
K in formulaαc--- the angle α solves coefficient when SSSC capacitive compensation, then:
Solve α are as follows:
When being in inductive compensation for SSSC shown in Fig. 7, the distance protection of SSSC inductive compensation mode can be similarly constructed
Criterion；
klIt is available by identical derivation for SSSC inductive compensation distance protection setting coefficient:
Wherein kαlThe angle α solves coefficient when for SSSC inductive compensation, then:
The operating condition of SSSC, SSSC capacitive compensation distance protection setting coefficient and SSSC perception after determining line fault
After uncompensation distance protection seting coefficient, transmission line distance protecting definite value need to be determined, therefore, the step 102, comprising:
If the operating condition of SSSC is stoppage in transit state, SSSC on route distance protection without influence, then line impedance relay
Distance protection criterion include: to work as | Zm|≤|Zset1| when, Location is located in protection zone, when | Zm| > | Zset1|,
Location is located at outside protection zone, wherein ZmFor the measurement impedance of line impedance relay, Zset1It is compensated for no SSSC
When protected circuit protection definite value.
If the operating condition of SSSC be main body protection quick acting state, SSSC adjust the distance protection influence for coupling transformation
The protection of adjusting the distance of the equivalent leakage reactance of device has an impact, then the distance protection criterion of line impedance relay includes: to work as | Zm|≤|
Zset2| when, Location is located in protection zone, when | Zm| > | Zset2|, Location is located at outside protection zone,
Wherein, ZmFor the measurement impedance of line impedance relay, Zset2Protected circuit when equivalent leakage reactance to consider coupling transformer
Protect definite value.
Wherein, the protection definite value Z of protected circuit when determining the equivalent leakage reactance for considering coupling transformer as the following formulaset2:
Zset2=Zset1+ZB
In above formula, Zset1The protection definite value of protected circuit, Z when being compensated for no SSSCBFor the equivalent leakage of coupling transformer
It is anti-.
If the operating condition of SSSC be main body protection non-action state, SSSC adjust the distance protection influence be its output voltage
Protection of adjusting the distance has an impact, at this time in impedance relay introduce SSSC output voltage signal, then line impedance relay away from
Include: from Protection criteria
When SSSC is in capacitive compensation mode and kc|Zm|≤|Zset1| when, Location is located in protection zone, when
SSSC is in capacitive compensation mode and kc|Zm| > | Zset1|, Location is located at outside protection zone, wherein ZmFor route
The measurement impedance of impedance relay, Zset1The protection definite value of protected circuit, k when being compensated for no SSSCcFor SSSC capacitive compensation away from
From protection seting coefficient；
When SSSC is in inductive compensation mode and kl|Zm|≤|Zset1| when, Location is located in protection zone, when
SSSC is in inductive compensation mode and kl|Zm| > | Zset1|, Location is located at outside protection zone, wherein ZmFor route
The measurement impedance of impedance relay, Zset1The protection definite value of protected circuit, k when being compensated for no SSSClFor SSSC inductive compensation away from
From protection seting coefficient.
Overall evaluation of a technical project provided by the invention considers SSSC main body protection and route distance protection, realizes containing SSSC
Transmission line of electricity distance protection action message when breaking down, utilize the bypass IGBT group signal and bypass breaker of SSSC
Position contact point signal judges that the operating condition of SSSC, engineering feasibility are strong.
The present invention also provides a kind of Distance Protection Devices containing SSSC, as shown in figure 8, described device includes:
First determining module, for the bypass IGBT group signal and bypass breaker position contact point signal according to SSSC
It determines the operating condition of SSSC after line fault, and determines SSSC capacitive compensation distance protection setting coefficient and SSSC inductive compensation
Distance protection setting coefficient；
Second determining module, for the operating condition according to SSSC, and using the measurement impedance of line impedance relay,
SSSC capacitive compensation distance protection setting coefficient or SSSC inductive compensation distance protection setting coefficient determine line impedance relay
Distance protection criterion.
Specifically, first determining module, comprising: the first determination unit is used for:
If the bypass thyristor Triggerless of the SSSC and bypass breaker of SSSC is in closing position, the fortune of SSSC
Row operating condition is stoppage in transit state；
If the bypass thyristor of SSSC has the bypass breaker of trigger signal and SSSC to be in open position, the fortune of SSSC
Row operating condition is main body protection quick acting state；
If the bypass thyristor Triggerless of the SSSC and bypass breaker of SSSC is in open position, the fortune of SSSC
Row operating condition is main body protection non-action state.
Second determining module, comprising:
Second determination unit, if the operating condition for SSSC is stoppage in transit state, the distance of line impedance relay is protected
Protecting criterion includes: to work as | Zm|≤|Zset1| when, Location is located in protection zone, when | Zm| > | Zset1|, line fault
Position is located at outside protection zone, wherein ZmFor the measurement impedance of line impedance relay, Zset1It is protected when being compensated for no SSSC
The protection definite value of route.
Second determining module, comprising:
Third determination unit, if for SSSC operating condition be main body protection quick acting state, line impedance after
The distance protection criterion of electric appliance includes: to work as | Zm|≤|Zset2| when, Location is located in protection zone, when | Zm| > |
Zset2|, Location is located at outside protection zone, wherein ZmFor the measurement impedance of line impedance relay, Zset2To consider
The protection definite value of protected circuit when the equivalent leakage reactance of coupling transformer.
Wherein, the protection definite value Z of protected circuit when determining the equivalent leakage reactance for considering coupling transformer as the following formulaset2:
Zset2=Zset1+ZB
In above formula, Zset1The protection definite value of protected circuit, Z when being compensated for no SSSCBFor the equivalent leakage of coupling transformer
It is anti-.
Second determining module, comprising:
4th determination unit, if the operating condition for SSSC is main body protection non-action state, line impedance relay
The distance protection criterion of device includes:
When SSSC is in capacitive compensation mode and kc|Zm|≤|Zset1| when, Location is located in protection zone, when
SSSC is in capacitive compensation mode and kc|Zm| > | Zset1|, Location is located at outside protection zone, wherein ZmFor route
The measurement impedance of impedance relay, Zset1The protection definite value of protected circuit, k when being compensated for no SSSCcFor SSSC capacitive compensation away from
From protection seting coefficient；
When SSSC is in inductive compensation mode and kl|Zm|≤|Zset1| when, Location is located in protection zone, when
SSSC is in inductive compensation mode and kl|Zm| > | Zset1|, Location is located at outside protection zone, wherein ZmFor route
The measurement impedance of impedance relay, Zset1The protection definite value of protected circuit, k when being compensated for no SSSClFor SSSC inductive compensation away from
From protection seting coefficient.
First determining module, comprising:
5th determination unit, for determining SSSC capacitive compensation distance protection setting coefficient k as the following formulac:
In above formula, α is that bus is powered on bus to fault point line impedance to the actual voltage drop phasor of fault point route
The angle of pressure drop phasor, β are the angle that electric current phasor and short circuit current phasor are measured at bus, and θ is that electric current phase is measured at bus
The angle of amount and bus to the actual voltage drop phasor of fault point route, μ are that electric current is measured at faulted phase current phasor and bus
Phasor, λ are measurement electric current phasor and the angle that voltage phasor is measured at bus at bus；
SSSC inductive compensation distance protection setting coefficient k is determined as the following formulal:
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail referring to above-described embodiment for pipe, it should be understood by those ordinary skilled in the art that: still
It can be with modifications or equivalent substitutions are made to specific embodiments of the invention, and without departing from any of spirit and scope of the invention
Modification or equivalent replacement, should all cover within the scope of the claims of the present invention.
Claims (12)
1. a kind of transmission line distance protecting method containing SSSC, which is characterized in that the described method includes:
SSSC after line fault is determined according to the bypass IGBT group signal of SSSC and bypass breaker position contact point signal
Operating condition, and determine SSSC capacitive compensation distance protection setting coefficient and SSSC inductive compensation distance protection setting coefficient；
It is protected according to the operating condition of SSSC, and using the measurement impedance of line impedance relay, SSSC capacitive/inductive compensation distance
Tuning coefficient is protected, determines the distance protection criterion of line impedance relay；
After the bypass IGBT group signal and bypass breaker position contact point signal according to SSSC determines line fault
The operating condition of SSSC, comprising:
If the bypass thyristor Triggerless of the SSSC and bypass breaker of SSSC is in closing position, the operation work of SSSC
Condition is stoppage in transit state；
If the bypass thyristor of SSSC has the bypass breaker of trigger signal and SSSC to be in open position, the operation work of SSSC
Condition is main body protection quick acting state；
If the bypass thyristor Triggerless of the SSSC and bypass breaker of SSSC is in open position, the operation work of SSSC
Condition is main body protection non-action state.
2. the method as described in claim 1, which is characterized in that determine the distance protection criterion of line impedance relay, comprising:
If the operating condition of SSSC is stoppage in transit state, the distance protection criterion of line impedance relay includes: to work as | Zm|≤|
Zset1| when, Location is located in protection zone, when | Zm| > | Zset1|, Location is located at outside protection zone,
Wherein, ZmFor the measurement impedance of line impedance relay, Zset1The protection definite value of protected circuit when being compensated for no SSSC.
3. the method as described in claim 1, which is characterized in that determine the distance protection criterion of line impedance relay, comprising:
If the operating condition of SSSC is main body protection quick acting state, the distance protection criterion packet of line impedance relay
It includes: when | Zm|≤|Zset2| when, Location is located in protection zone, when | Zm| > | Zset2|, Location is located at
Outside protection zone, wherein ZmFor the measurement impedance of line impedance relay, Zset2For consider coupling transformer equivalent leakage reactance when
The protection definite value of protected circuit.
4. method as claimed in claim 3, which is characterized in that quilt when determining the equivalent leakage reactance for considering coupling transformer as the following formula
The protection definite value Z of protection circuitset2:
Zset2=Zset1+ZB
In above formula, Zset1The protection definite value of protected circuit, Z when being compensated for no SSSCBFor the equivalent leakage reactance of coupling transformer.
5. the method as described in claim 1, which is characterized in that determine the distance protection criterion of line impedance relay, comprising:
If the operating condition of SSSC is main body protection non-action state, the distance protection criterion of line impedance relay includes:
When SSSC is in capacitive compensation mode and kc|Zm|≤|Zset1| when, Location is located in protection zone, works as SSSC
In capacitive compensation mode and kc|Zm| > | Zset1|, Location is located at outside protection zone, wherein ZmFor line impedance
The measurement impedance of relay, Zset1The protection definite value of protected circuit, k when being compensated for no SSSCcIt is protected for SSSC capacitive compensation distance
Protect tuning coefficient；
When SSSC is in inductive compensation mode and kl|Zm|≤|Zset1| when, Location is located in protection zone, works as SSSC
In inductive compensation mode and kl|Zm| > | Zset1|, Location is located at outside protection zone, wherein ZmFor line impedance
The measurement impedance of relay, Zset1The protection definite value of protected circuit, k when being compensated for no SSSClIt is protected for SSSC inductive compensation distance
Protect tuning coefficient.
6. the method as described in claim 1, which is characterized in that the determining SSSC capacitive compensation distance protection setting coefficient and
SSSC inductive compensation distance protection setting coefficient, comprising:
SSSC capacitive compensation distance protection setting coefficient k is determined as the following formulac:
In above formula, α is voltage drop on bus to the actual voltage drop phasor of fault point route and bus to fault point line impedance
The angle of phasor, β be bus at measure electric current phasor and short circuit current phasor angle, θ be bus at measure electric current phasor and
For bus to the angle of the actual voltage drop phasor of fault point route, μ is that electric current phasor is measured at faulted phase current phasor and bus
Angle, λ be bus at measurement electric current phasor and bus at measure voltage phasor angle；
SSSC inductive compensation distance protection setting coefficient k is determined as the following formulal:
7. a kind of Distance Protection Device containing SSSC, which is characterized in that described device includes:
First determining module, for being determined according to the bypass IGBT group signal and bypass breaker position contact point signal of SSSC
The operating condition of SSSC after line fault, and determine SSSC capacitive compensation distance protection setting coefficient and SSSC inductive compensation distance
Protection seting coefficient；
Second determining module is held for the operating condition according to SSSC, and using the measurement impedance of line impedance relay, SSSC
Property uncompensation distance protection seting coefficient or SSSC inductive compensation distance protection setting coefficient determine the distance of line impedance relay
Protection criteria；
First determining module, comprising: the first determination unit is used for:
If the bypass thyristor Triggerless of the SSSC and bypass breaker of SSSC is in closing position, the operation work of SSSC
Condition is stoppage in transit state；
If the bypass thyristor of SSSC has the bypass breaker of trigger signal and SSSC to be in open position, the operation work of SSSC
Condition is main body protection quick acting state；
If the bypass thyristor Triggerless of the SSSC and bypass breaker of SSSC is in open position, the operation work of SSSC
Condition is main body protection non-action state.
8. device as claimed in claim 7, which is characterized in that second determining module, comprising:
Second determination unit, if the operating condition for SSSC is stoppage in transit state, the distance protection of line impedance relay is sentenced
According to including: to work as | Zm|≤|Zset1| when, Location is located in protection zone, when | Zm| > | Zset1|, Location
Outside protection zone, wherein ZmFor the measurement impedance of line impedance relay, Zset1Protected circuit when being compensated for no SSSC
Protection definite value.
9. device as claimed in claim 7, which is characterized in that second determining module, comprising:
Third determination unit, if the operating condition for SSSC is main body protection quick acting state, line impedance relay
Distance protection criterion include: to work as | Zm|≤|Zset2| when, Location is located in protection zone, when | Zm| > | Zset2|,
Location is located at outside protection zone, wherein ZmFor the measurement impedance of line impedance relay, Zset2To consider that coupling becomes
The protection definite value of protected circuit when the equivalent leakage reactance of depressor.
10. device as claimed in claim 9, which is characterized in that when determining the equivalent leakage reactance for considering coupling transformer as the following formula
The protection definite value Z of protected circuitset2:
Zset2=Zset1+ZB
In above formula, Zset1The protection definite value of protected circuit, Z when being compensated for no SSSCBFor the equivalent leakage reactance of coupling transformer.
11. device as claimed in claim 7, which is characterized in that second determining module, comprising:
4th determination unit, if the operating condition for SSSC is main body protection non-action state, line impedance relay
Distance protection criterion includes:
When SSSC is in capacitive compensation mode and kc|Zm|≤|Zset1| when, Location is located in protection zone, works as SSSC
In capacitive compensation mode and kc|Zm| > | Zset1|, Location is located at outside protection zone, wherein ZmFor line impedance
The measurement impedance of relay, Zset1The protection definite value of protected circuit, k when being compensated for no SSSCcIt is protected for SSSC capacitive compensation distance
Protect tuning coefficient；
When SSSC is in inductive compensation mode and kl|Zm|≤|Zset1| when, Location is located in protection zone, works as SSSC
In inductive compensation mode and kl|Zm| > | Zset1|, Location is located at outside protection zone, wherein ZmFor line impedance
The measurement impedance of relay, Zset1The protection definite value of protected circuit, k when being compensated for no SSSClIt is protected for SSSC inductive compensation distance
Protect tuning coefficient.
12. device as claimed in claim 7, which is characterized in that first determining module, comprising:
5th determination unit, for determining SSSC capacitive compensation distance protection setting coefficient k as the following formulac:
In above formula, α is voltage drop on bus to the actual voltage drop phasor of fault point route and bus to fault point line impedance
The angle of phasor, β be bus at measure electric current phasor and short circuit current phasor angle, θ be bus at measure electric current phasor and
For bus to the angle of the actual voltage drop phasor of fault point route, μ is that electric current phasor is measured at faulted phase current phasor and bus
Angle, λ be bus at measurement electric current phasor and bus at measure voltage phasor angle；
SSSC inductive compensation distance protection setting coefficient k is determined as the following formulal:
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| CN101789602A (en) * | 2010-01-13 | 2010-07-28 | 中国电力科学研究院 | Dynamic simulation device of extra-high, ultrahigh voltage thyristor controlled series compensation device and test method thereof |
| CN104134968A (en) * | 2014-08-05 | 2014-11-05 | 南京南瑞继保电气有限公司 | Protection method and system for unified power flow controller |
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| CN101789602A (en) * | 2010-01-13 | 2010-07-28 | 中国电力科学研究院 | Dynamic simulation device of extra-high, ultrahigh voltage thyristor controlled series compensation device and test method thereof |
| CN104134968A (en) * | 2014-08-05 | 2014-11-05 | 南京南瑞继保电气有限公司 | Protection method and system for unified power flow controller |
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