CN105576607B - The acceleration protection method and apparatus of block filter off resonance failure - Google Patents
The acceleration protection method and apparatus of block filter off resonance failure Download PDFInfo
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- CN105576607B CN105576607B CN201610137936.8A CN201610137936A CN105576607B CN 105576607 B CN105576607 B CN 105576607B CN 201610137936 A CN201610137936 A CN 201610137936A CN 105576607 B CN105576607 B CN 105576607B
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/027—Details with automatic disconnection after a predetermined time
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
Abstract
The invention discloses the acceleration protection method of block filter off resonance failure.Protective relaying device samples to the electric current of block filter shunt reactor and capacitor, block filter total current；The current ratio of calculating reactance device and condenser current fundamental voltage amplitude；The power frequency variation of total current is calculated, when it exceedes the threshold of setting, locking short delay protection mark is set to 1, is otherwise set to 0；When total current amplitude is sufficiently large, current ratio is out-of-limit, and when locking short delay protection is masked as 0, through short delay T3Accelerate off resonance protection act；Still original long delay off resonance Protection criteria is retained.Present invention also offers corresponding device.The acceleration short delay protection criterion of this invention has taken into account the reliability and rapidity of protection through the out-of-limit mark broadening locking of power frequency variation.
Description
Technical field
The invention belongs to the relay protecting method and dress of field of power, more particularly to block filter off resonance failure
Put.
Background technology
In long range high-voltage AC transmission system, sometimes for power network transmission power is improved, electricity can be installed additional in the line
Hold string complement system, due to the possibility of resonance between electric capacity and line reactance be present, when design parameter is unreasonable, or the method for operation
When causing actual parameter unreasonable after change, the sub-synchronous oscillation of network system may be triggered, and then trigger power supply point (to generate electricity
Factory) the dangerous torsional oscillation of steam-electric generating set shafting appearance, it can cause big axle cracked when serious or even be broken.
To suppress the sub-synchronous oscillation and shaft system of unit torsional oscillation of network system, it is one to install block filter at power supply point
The effective technological means of kind.The Najavo power plant in the U.S., the Tuoketuo Power Plant of China have been respectively mounted large-scale block filter equipment.
Block filter is the high pressure passive filter of some reactors, capacitor by connection in series-parallel composition, is serially connected in power plant main transformer
The neutral point side of depressor high-pressure side Y windings, split-phase installation, higher impedance is showed to specific subsynchronous frequency, so as to press down
These subsynchronous frequency currents are made, have the function that torsional oscillation suppresses.
There is varactor capacitance device (abbreviation LC) parallel circuit among block filter.The protection system configuration of block filter
LC off resonance defencive functions, the mainly out-of-limit protection of LC current ratios.The general principle of the guard method is to calculate parallel connection respectively
LC reactor current fundamental voltage amplitude and condenser current fundamental voltage amplitude, and the ratio of the two fundamental current amplitudes is calculated, manage
The inverse of reactor inductance and the product of condenser capacitance is proportional to by the above current ratio.When block filter operating current surpasses
A threshold is crossed, and when LC does not have failure, current ratio can be stablized within the scope of one；When LC breaks down, such as reactance
There is turn-to-turn fault in device, or fuse failure occurs in the capacitor unit of capacitor internal, then reactor inductance parameter or electricity
Capacitor parameter will change, and then current ratio can exceed speed upper limit or ratio lower limit, after current ratio is out-of-limit,
By certain delay, protection act tripping operation.Off resonance protection directly reflects whether block filter LC parameters exception, LC occur
Abnormal parameters will cause torsional oscillation to suppress failure, therefore block filter off resonance protection is very important protection, is technically wished
The protection is reliable, quick, sensitive.
But existing method has the shortcomings that obvious, when system disturbance or vibration, for example there is single-phase connect in high-voltage fence
During earth fault, the current ratio calculating result of off resonance protection, which occurs, significantly to be fluctuated, it is possible to causes false protection.To carry
The reliability of height protection, it has to abandon the sensitivity of protection, specific practice is：On the one hand the current ratio upper limit, lower limit are expanded
Scope, on the other hand the delay fixed value adjusting of protection obtain very long, generally reach 15s.Therefore, existing block filter protection
Technology is not a reliable quickly protection.
The content of the invention
The purpose of the present invention is：It is proposed a kind of acceleration protection method and apparatus of block filter off resonance failure；Obstruction filter
When the out-of-limit criterion of ripple device off resonance protective current ratio meets, if detecting that big disturbance does not occur in network system simultaneously,
Then through too short delay off resonance protection act, protection accelerated motion；The out-of-limit criterion of block filter off resonance protective current ratio expires
When sufficient, if detecting that big disturbance occurs in network system simultaneously, off resonance protection is still carried out by original long delay protection
Action；So as to take into account the rapidity and reliability of protection.
The present invention theoretical foundation be：When block filter designs, showed just for specific subsynchronous frequency higher
Impedance, but for work frequency, block filter impedance very little.Therefore：
(a) when block filter LC in parallel breaks down, the out-of-limit criterion of block filter current ratio can meet, together
When block filter total current be not in violent variation, now allow off resonance protect through short delay quick acting；
(b) when block filter LC in parallel does not have failure, if network system has a microvariations, block filter it is total
Electric current only has less disturbance, while the out-of-limit criterion of block filter current ratio will not meet that protection will not malfunction；
(c) when block filter LC in parallel does not have failure, but if there is large disturbances, block filter in network system
Total current occur violent variation, while the out-of-limit criterion of block filter current ratio can meet, to prevent false protection,
Network system is determined using power frequency variation principle and large disturbances, locking block filter short delay protection occurs.
In order to reach the purpose of the rapidity and reliability of taking into account protection, the technical solution adopted by the present invention is：Obstruction filter
The acceleration protection method of ripple device off resonance failure, comprises the following steps：
(1) protective relaying device samples to the electric current of block filter shunt reactor and capacitor, whole to flowing through
The total current of individual block filter is sampled；
(2) fundamental voltage amplitude of difference calculating reactance device electric current, condenser current and total current；
(3) current ratio of calculating reactance device current first harmonics amplitude and condenser current fundamental voltage amplitude；
(4) power frequency variation of block filter total current is calculated；When power frequency variation exceedes the threshold of setting, will close
The mark of lock short delay protection is set to " 1 ", otherwise through the T that is delayed1The mark is set to " 0 "；
(5) when total current amplitude is sufficiently large, if current ratio exceeds the upper limit adjusted in advance, lower range, through length
Be delayed T2Send alarm signal or trip signal and output relay idle contact；
(6) when total current amplitude is sufficiently large, if current ratio exceeds the upper limit, the lower range adjusted in advance, close simultaneously
When being masked as " 0 " of short delay protection is locked, through short delay T3Send alarm signal or trip signal and output relay idle contact.
Further, the method for calculating fundamental current amplitude is whole wave, short-data windows Fourier number value-based algorithm, or is adopted
Sine wave peak detection algorithm after being filtered with narrow-band bandpass.
Further, power frequency variation Δ I computational methods are among the step (4)：The sampled value of current total current
The sampled value before a power frequency period is subtracted, and is taken absolute value, thus obtains power frequency variation instantaneous value；Power frequency change is calculated again
Virtual value of the change amount instantaneous value in a power frequency period, that is, obtain power frequency variation Δ I.
Further, the specific method of step (4) the setting mark is：When power frequency variation exceedes the threshold Δ of setting
IsetWhen, the mark of locking short delay protection is set to " 1 ", as threshold Δ I of the power frequency variation less than settingsetWhen, by one
Individual long delay T1, the mark of locking short delay protection is set to " 0 ".
Further, threshold Δ I among the step (4)setSpan be 0.2In~2.0In, wherein InIt is to be used for
Measure the secondary rated value of the current transformer of block filter total current, generally 5A or 1A, threshold Δ IsetDefault value
Take 1.0In。
Further, the short delay T3Span be 0s~1s, default value takes 0.2s；The long delay T2Take
Value scope is 1s~60s, and default value takes 15s；The delay T1Value be T1=T2+ Δ T, wherein Δ T span are
0.3s~0.5s, Δ T default values take 0.3s.
The present invention also provide block filter off resonance failure acceleration protection device, it is characterised in that including sampling module,
Computing module, judgement and action module, wherein：
The sampling module is used to enter the electric current of block filter shunt reactor and capacitor protective relaying device
Row sampling, is sampled to the total current for flowing through block filter；
The computing module is used for calculating reactance device current first harmonics amplitude, condenser current fundamental voltage amplitude, block filter
The ratio of the electric current of the fundamental voltage amplitude of total current, calculating reactance device current first harmonics amplitude and condenser current fundamental wave, calculate obstruction
The power frequency variation of wave filter total current；
The judgement and action module are used for the result according to computing module, and it is big that (1) judges whether network system occurs
Disturbance：When power frequency variation exceedes the threshold of setting, the mark of locking short delay protection is set to " 1 ", be otherwise delayed T1Will
The mark is set to " 0 "；(2) when total current amplitude is sufficiently large, if current ratio exceeds the upper limit, the lower range adjusted in advance
When, through long delay T2Send alarm signal or trip signal and output relay idle contact；(3) when total current amplitude is sufficiently large,
If current ratio exceeds the upper limit, the lower range adjusted in advance, while when being masked as " 0 " of locking short delay protection, through short
Be delayed T3Send alarm signal or trip signal and output relay idle contact.
Further, in the computing module, the method for calculating fundamental current amplitude is whole wave, short-data windows Fourier
Numerical algorithm, or using sine wave peak detection algorithm after narrow-band bandpass filtering.
Further, in the computing module, calculating power frequency variation Δ I computational methods is：Current total current is adopted
Sample value subtracts the sampled value before a power frequency period, and takes absolute value, and thus obtains power frequency variation instantaneous value；Calculate power frequency
Virtual value of the variable quantity instantaneous value in a power frequency period, that is, obtain power frequency variation Δ I.
Further, it is described differentiation and action module in, judge whether network system the specific method of big disturbance occurs
It is：When power frequency variation exceedes the threshold Δ I of settingsetWhen, the mark of locking short delay protection is set to " 1 ", when power frequency changes
Threshold Δ I of the amount less than settingsetWhen, by a long delay T1, the mark of locking short delay protection is set to " 0 ".
Further, it is described differentiation and action module in, threshold Δ IsetSpan be 0.2In~2.0In, wherein In
It is the secondary rated value for measuring the current transformer of block filter total current, generally 5A or 1A, threshold Δ Iset's
Default value takes 1.0In。
Further, it is described differentiation and action module in, the short delay T3Span be 0s~1s, default value takes
0.2s；The long delay T2Span be 1s~60s, default value takes 15s；The delay T1Value be T1=T2+ Δ T,
Wherein Δ T span is 0.3s~0.5s, and Δ T default values take 0.3s.
After such scheme, present invention preserves original out-of-limit guard method of off resonance protective current ratio --- electric current ratio
The out-of-limit long delay protection of rate, the power frequency variation for adding block filter total current differentiate and the out-of-limit short delay guarantor of current ratio
Shield, when identifying that large disturbances occurs in network system by power frequency variation criterion, locking short delay protection, otherwise just open short prolong
When protect；The present invention has taken into account the reliability and rapidity of protection.
Brief description of the drawings
Fig. 1 is the circuit diagram of generator, main transformer and block filter；Wherein：A is generator, and b is main transformer pressure
Device, c are block filters.
Fig. 2 is that A phases block filter internal circuit and current transformer connection schematic diagram；Wherein, L0 is 0 rank reactor,
L1 is 1 rank reactor, and C1 is 1 rank capacitor, and L2 is 2 rank reactors, and C2 is 2 rank capacitors, and L3 is 3 rank reactors, and C3 is 3 ranks
Capacitor, PSW1 are by-pass switches, CTL1It is the current transformer of 1 rank reactor, CTC1It is the current transformer of 1 rank capacitor,
CTBFIt is the current transformer of block filter total current.
Fig. 3 is the relay protective scheme figure of the embodiment of the present invention；Wherein, a is the criterion that current ratio is less than lower limit, and b is electric current
Ratio is higher than the criterion of the upper limit, and c is the sufficiently large criterion of block filter total current, and d is that power frequency variation exceedes setting threshold
Criterion, e is " logic sum gate " computing, and f is " logical AND gate " computing, and g is the computing that instantaneous set, delay are reset, and h is delay
Set, the computing instantaneously returned, i are off resonance protection alarm or protection act.
Fig. 4 is the structure drawing of device of the embodiment of the present invention.
Embodiment
Below with reference to drawings and the specific embodiments, technical scheme is described in detail.
The embodiment of the present invention provides a kind of acceleration protection method of block filter off resonance failure, comprises the following steps：
(1) protective relaying device samples to the electric current of block filter shunt reactor and capacitor, whole to flowing through
The total current of individual block filter is sampled；
(2) fundamental voltage amplitude of difference calculating reactance device electric current, condenser current and total current；
(3) current ratio of calculating reactance device current first harmonics amplitude and condenser current fundamental voltage amplitude；
(4) power frequency variation of block filter total current is calculated；When power frequency variation exceedes the threshold of setting, will close
The mark of lock short delay protection is set to " 1 ", otherwise through the T that is delayed1The mark is set to " 0 "；
(5) when total current amplitude is sufficiently large, if current ratio exceeds the upper limit adjusted in advance, lower range, through length
Be delayed T2Send alarm signal or trip signal and output relay idle contact；
(6) when total current amplitude is sufficiently large, if current ratio exceeds the upper limit, the lower range adjusted in advance, close simultaneously
When being masked as " 0 " of short delay protection is locked, through short delay T3Send alarm signal or trip signal and output relay idle contact.
Hereinafter the above method and step are illustrated with one embodiment：One 600MW generating set, rated power are
600MW, rated voltage 22kV, rated power factor 0.9；Main transformer rated capacity 750MVA, rated voltage no-load voltage ratio 500kV/
22kV, the Yd-11 mode of connection, short-circuit impedance 13.5%；As shown in figure 1, wherein, a. generators.B. main transformer.C.A phase resistances
Fill in wave filter.B phases, C phases block filter are identical with the circuit of A phase block filters.
Main transformer high-pressure side neutral point is opened, and is grounded after concatenation three-phase block filter BF, BF is mutual by inductance and electric capacity
Connection in series-parallel forms.Circuit topology is as shown in Figure 2.In wherein Fig. 2：
PSW1 is by-pass switch, and L0 is 0 rank reactor, and C1, L1 are the 1st group of shunt capacitor and reactor, C2, L2
2 groups of shunt capacitors and reactor, C3, L3 are the 3rd group of shunt capacitor and reactor, CTC1It is C1 current transformer, CTL1
It is L1 current transformer, CTBFIt is the current transformer of whole block filter.C2, L2, C3, L3 electric current are eliminated in figure
Transformer, it is not drawn into.
BF basic parameter is as follows：
L0 impedance ZL0=28.25 Ω, the 1st group of shunt reactor L1 impedance ZL1=9.457 Ω, the 1st group of shunt capacitance
Device C1 capacitive reactance XC1=5.272 Ω, the 2nd group of shunt reactor L2 impedance ZL2=39.578 Ω, the 2nd group of shunt capacitor C2
Capacitive reactance XC2=9.326 Ω, the 3rd group of shunt reactor L3 impedance ZL3=20.054 Ω, the 3rd group of shunt capacitor C3 appearance
Anti- XC3=3.368 Ω, Current TransmitL1Electric current no-load voltage ratio be nCT,L1=1200A/5A, Current TransmitC1Electric current become
Than for nCT,C1=2500A/5A, Current TransmitBFElectric current no-load voltage ratio be nCT,BF=1000A/5A.With the 1st group in Fig. 2 simultaneously
Exemplified by joining reactor, capacitor, illustrate the specific implementation content of the acceleration protection method of the off resonance failure of the present invention.2nd group,
3 groups of shunt reactor, the implementation of capacitor off resonance protection are identical with this, B phases, the off resonance protection of C phases and A phases off resonance guarantor
The implementation of shield is identical.
The 1st group of shunt reactor of A phases, the specific implementation step of capacitor off resonance protection are as follows：
(1) step 1, protective relaying device are sampled to obtain electric current i to the 1st group of electric current to shunt reactorL；It is right
The electric current of shunt capacitor is sampled to obtain electric current iC, the total current for flowing through LC parallel circuits is sampled to obtain electric current
iBF.The sample frequency f of acquiescences=1200Hz.
(2) step 2, after whole wave, short-data windows Fourier number value-based algorithm, or use narrow-band bandpass filtering just
String crest value detection algorithm, calculating reactance device electric current iL, condenser current iCWith total current iBFFundamental voltage amplitude, respectively IL、IC
And IBF, the present embodiment uses whole wave Fourier number value-based algorithm, and formula is as follows：
Wherein, subscript m=L, C, BF represent " reactor ", " capacitor ", " block filter "；IL、IC、IBFRepresent respectively
Reactor current iL, condenser current iC, flow through the total current i of block filterBFAmplitude；N is when Fourtier integral calculates
Data window length, default value take N=24；In this example, N=24；K represents sample sequence number.
(3) step 3, calculating reactance device current first harmonics amplitude ILWith condenser current fundamental voltage amplitude ICCurrent ratio λLC,
Using following formula：
Wherein, ε is the one small value threshold of protective relaying device internal processes setting, and it is 0 to prevent divisor.ε value model
It is the 0.5%~2% of the specified two sub-values amplitude of condenser current transformer to enclose, and acquiescence of the amplitude 1% as ε is taken under default situations
Value.Such as Current TransmitC1Two sub-value virtual values be 5A, desirable 5A corresponds to the 1% of amplitude, i.e., 0.0707A is as ε's
Default value.
(4) step 4, the power frequency variation Δ I of block filter total current, using following formula：
Wherein, iBFIt is the total current for flowing through block filter；ΔiBFIt is the power frequency variation wink of block filter total current
Duration；N is data window length when Fourtier integral calculates, and default value takes N=24.In this example, N=24；K represents sample sequence
Number；
Further, discriminate whether network system large disturbances occur by following criterions：
ΔI>ΔIsetFormula 4
Wherein, Δ IsetFor the threshold of setting, threshold Δ IsetSpan be 0.2In~2.0In, I herenIt is electricity
Current transformer CTC1Secondary rated value 5A, threshold Δ IsetDefault value take 1.0In；
When above-mentioned formula 4 meets, it is believed that network system large disturbances occur, the mark of locking short delay protection is set to
“1”；When above-mentioned formula 4 is unsatisfactory for, it is believed that network system large disturbances do not occur, or network system large disturbances have disappeared, warp
Cross a long delay T1, the mark of locking short delay protection is set to " 0 "；The delay T1Value be T1=T2+ Δ T, its
In, T2It is the delay definite value of the long delay protection of original off resonance protective current ratio criterion, T2Span be 1s~60s, write from memory
Recognize value and take 15s；Δ T is that the time is differential, and Δ T span is 0.3s~0.5s, and Δ T default values take 0.3s.
(5) step 5, current ratio λ is differentiated using following criterionLCIt is whether out-of-limit：
IBF>IBF.setAnd [λLC>λLC.set.maxOr λLC<λLC.set.min] formula 5
Wherein, IBF.setIt is that electric current opens definite value, λLC.set.maxIt is that current ratio protects the definite value upper limit, λLC.set.minIt is electric current
Ratio protects definite value lower limit；The method of fixed value adjusting is as follows：
(a) calculate under nominal operating conditions, flow through the total current amplitude of block filter, obtain IBF.rated, take the amplitude
10%~40% adjusts protection definite value IBF.set；For this example, during the specified operation of generator, the electric current of block filter is flowed through
It is：
For example taking 20% to be adjusted, result of calculation is：
IBF.set=20% × 3.849A=0.770A
(b) according to LC parameters, I when calculating normal operationLWith ICCurrent ratio λnrml, for this example,In formula, IL' it is Current Mutual Inductance
Device CTL1A sub-value (the primary current value for flowing through reactor L1), I'CIt is Current TransmitC1A sub-value (flow through electricity
Container C1 primary current value)；Ratio p%, p span 2~10 is taken, by λnrmlDecline p% and adjust λLC.set.min, by λnrml
Rise p% and adjust λLC.set.max；For example during p=5, result of calculation is：
λLC.set.min=λnrml(1-p%)=1.1614 × (1-5%)=1.1033
λLC.set.max=λnrml(1+p%)=1.1614 × (1+5%)=1.2195
Reference picture 3, when described formula 5 meets condition, through long delay T2Send alarm signal or trip signal and output after
Electrical equipment idle contact；The long delay T2Span be 1s~60s, default value takes 15s.
(6) step 6, current ratio λ is differentiated using step 5 identical criterion (formula 5)LCIt is whether out-of-limit；Reference picture 3, when
Described formula 5 meets condition, while the locking short delay protection described in step 4 is masked as " 0 ", then through short delay T3Hair
Go out alarm signal or trip signal and output relay idle contact；The short delay T2Span be 0s~1s, default value
Take 0.2s.
The above method realizes the 1st group of off resonance protection of block filter A phases.The 2nd group of A phases, the 3rd group of shunt reactor,
The implementation of capacitor off resonance protection is identical with this.The implementation phase that B phases, the off resonance protection of C phases and the off resonance of A phases are protected
Together.Repeat no more.
After method using the present invention, original out-of-limit guard method of off resonance protective current ratio is remained --- current ratio
Out-of-limit long delay protection, the power frequency variation for adding block filter total current differentiate and the out-of-limit short delay guarantor of current ratio
Shield, when identifying that large disturbances occurs in network system by power frequency variation criterion, locking short delay protection, otherwise just open short prolong
When protect；The present invention has taken into account the reliability and rapidity of protection.
In addition, the present invention also provides a kind of acceleration protection device of block filter off resonance failure for embodiment, such as Fig. 4 institutes
Show, including sampling module, computing module, judgement and action module, wherein：
The sampling module is used to enter the electric current of block filter shunt reactor and capacitor protective relaying device
Row sampling, is sampled to the total current for flowing through block filter；
The computing module is used for calculating reactance device current first harmonics amplitude, condenser current fundamental voltage amplitude, block filter
The ratio of the electric current of the fundamental voltage amplitude of total current, calculating reactance device current first harmonics amplitude and condenser current fundamental wave, calculate obstruction
The power frequency variation of wave filter total current；
The judgement and action module are used for the result according to computing module, and it is big that (1) judges whether network system occurs
Disturbance：When power frequency variation exceedes the threshold of setting, the mark of locking short delay protection is set to " 1 ", be otherwise delayed T1Will
The mark is set to " 0 "；(2) when total current amplitude is sufficiently large, if current ratio exceeds the upper limit, the lower range adjusted in advance
When, through long delay T2Send alarm signal or trip signal and output relay idle contact；(3) when total current amplitude is sufficiently large,
If current ratio exceeds the upper limit, the lower range adjusted in advance, while when being masked as " 0 " of locking short delay protection, through short
Be delayed T3Send alarm signal or trip signal and output relay idle contact.
The technological thought of above example only to illustrate the invention, it is impossible to protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme, the scope of the present invention is each fallen within
Within.
Claims (12)
1. the acceleration protection method of block filter off resonance failure, it is characterised in that comprise the following steps：
(1) protective relaying device samples to the electric current of block filter shunt reactor and capacitor, to flowing through whole resistance
The total current of plug wave filter is sampled；
(2) fundamental voltage amplitude of difference calculating reactance device electric current, condenser current and total current；
(3) current ratio of calculating reactance device current first harmonics amplitude and condenser current fundamental voltage amplitude；
(4) power frequency variation of block filter total current is calculated；It is when power frequency variation exceedes the threshold of setting, locking is short
The mark of delay protection is set to " 1 ", otherwise through the T that is delayed1The mark is set to " 0 "；
(5) when block filter total current amplitude is more than the threshold value of setting, current ratio exceeds the upper limit adjusted in advance, lower limit model
Enclose, while when the mark of locking short delay protection is set to " 1 ", through long delay T2Send alarm signal or trip signal and output after
Electrical equipment idle contact；
(6) when block filter total current amplitude is more than the threshold value of setting, current ratio exceeds the upper limit adjusted in advance, lower limit model
Enclose, while when the mark of locking short delay protection is set to " 0 ", through short delay T3Send alarm signal or trip signal and output after
Electrical equipment idle contact.
2. the acceleration protection method of block filter off resonance failure as claimed in claim 1, it is characterised in that：Calculate power frequency base
The method of ripple current amplitude is whole wave, short-data windows Fourier number value-based algorithm, or using sine wave after narrow-band bandpass filtering
Peak detection algorithm.
3. the acceleration protection method of block filter off resonance failure as claimed in claim 1, it is characterised in that the step
(4) power frequency variation Δ I computational methods are among：The sampled value of current total current subtracts the sampling before a power frequency period
Value, and take absolute value, thus obtain power frequency variation instantaneous value；Power frequency variation instantaneous value is calculated again in a power frequency period
Virtual value, that is, obtain power frequency variation Δ I.
4. the acceleration protection method of block filter off resonance failure as claimed in claim 1, it is characterised in that the step
(4) setting the specific method of mark is：When power frequency variation exceedes the threshold Δ I of settingsetWhen, by locking short delay protection
Mark is set to " 1 ", as threshold Δ I of the power frequency variation less than settingsetWhen, by a long delay T1, the short delay of locking is protected
The mark of shield is set to " 0 ".
5. the acceleration protection method of block filter off resonance failure as claimed in claim 4, it is characterised in that：The step
(4) threshold Δ I amongsetSpan be 0.2In~2.0In, wherein, InIt is the electricity for measuring block filter total current
The secondary rated value of current transformer.
6. the acceleration protection method of block filter off resonance failure as claimed in claim 1, it is characterised in that：The short delay
T3Span be 0s~1s；The long delay T2Span be 1s~60s；The delay T1Value be T1=T2+
Δ T, wherein Δ T span are 0.3s~0.5s.
7. the acceleration protection device of block filter off resonance failure, it is characterised in that：Including sampling module, computing module, judgement
And action module, wherein：
The sampling module is used to adopt the electric current of block filter shunt reactor and capacitor protective relaying device
Sample, the total current for flowing through block filter is sampled；
It is always electric that the computing module is used for calculating reactance device current first harmonics amplitude, condenser current fundamental voltage amplitude, block filter
The ratio of the electric current of the fundamental voltage amplitude of stream, calculating reactance device current first harmonics amplitude and condenser current fundamental wave, calculate blocking filting
The power frequency variation of device total current；
The judgement and action module are used for the result according to computing module, and (1) judges whether network system big disturbance occurs：
When power frequency variation exceedes the threshold of setting, the mark of locking short delay protection is set to " 1 ", be otherwise delayed T1This is indicated
It is set to " 0 "；(2) when block filter total current amplitude be more than setting threshold value, current ratio exceed adjust in advance the upper limit, under
Scope is limited, while when the mark of locking short delay protection is set to " 1 ", through long delay T2Send alarm signal or trip signal and defeated
Go out relay idle contact；(3) when block filter total current amplitude is more than the threshold value of setting, current ratio exceeds what is adjusted in advance
The upper limit, lower range, while when the mark of locking short delay protection is set to " 0 ", through short delay T3Send alarm signal or tripping operation
Signal and output relay idle contact.
8. the acceleration protection device of block filter off resonance failure as claimed in claim 7, it is characterised in that：The calculating mould
In block, the method for calculating fundamental current amplitude is whole wave, short-data windows Fourier number value-based algorithm, or is filtered using narrow-band bandpass
Sine wave peak detection algorithm after ripple.
9. the acceleration protection device of block filter off resonance failure as claimed in claim 7, it is characterised in that：The calculating mould
In block, calculating power frequency variation Δ I computational methods is：Adopting before currently the sampled value of total current subtracts a power frequency period
Sample value, and take absolute value, thus obtain power frequency variation instantaneous value；Power frequency variation instantaneous value is calculated in a power frequency period
Virtual value, that is, obtain power frequency variation Δ I.
10. the acceleration protection device of block filter off resonance failure as claimed in claim 7, it is characterised in that：The judgement
And in action module, judge that the specific method whether network system big disturbance occurs is：When power frequency variation exceedes setting
Threshold Δ IsetWhen, the mark of locking short delay protection is set to " 1 ", as threshold Δ I of the power frequency variation less than settingsetWhen,
By a long delay T1, the mark of locking short delay protection is set to " 0 ".
11. the acceleration protection device of block filter off resonance failure as claimed in claim 7, it is characterised in that it is described judgement and
In action module, threshold Δ IsetSpan be 0.2In~2.0In, wherein InIt is to be used to measure block filter total current
Current transformer secondary rated value.
12. the acceleration protection device of block filter off resonance failure as claimed in claim 7, it is characterised in that it is described judgement and
In action module, the short delay T3Span be 0s~1s；The long delay T2Span be 1s~60s；It is described
Be delayed T1Value be T1=T2+ Δ T, wherein Δ T span are 0.3s~0.5s.
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