CN102570421B - Self-adapting weak feed fault detection method - Google Patents
Self-adapting weak feed fault detection method Download PDFInfo
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- CN102570421B CN102570421B CN201110454026.XA CN201110454026A CN102570421B CN 102570421 B CN102570421 B CN 102570421B CN 201110454026 A CN201110454026 A CN 201110454026A CN 102570421 B CN102570421 B CN 102570421B
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Abstract
The invention discloses a self-adapting weak feed fault detection method, aiming at improving the accuracy of automatic recognition of a weak feed mode and the speediness and reliability of weak feed protection. The self-adapting weak feed fault detection method disclosed by the invention comprises the following steps of: calculating the amplitudes of the voltages and currents of each phase to obtain the maximum and minimum values of three-phase fault voltages and currents; judging by adopting a three-phase flow judgment element; judging by adopting a zero-sequence current/voltage judgment element; judging by adopting a three-phase maximum current judgment element; judging by adopting a weak feed angle difference judgment element; judging by adopting a low-voltage judgment element; and adopting the weak feed protection. Compared with the prior art, the self-adapting weak feed fault detection method has the advantages that the automatic recognition of a weak feed side is achieved through judging weak feed angle difference according to the fault features of the weak feed side, so that the dynamic weak feed is realized; and the automatic recognition on a weak feed line can be carried out when the operating manner of an electric power system changes, the weak feed side is rapidly subjected to the weak feed protection, and therefore, the reliability and sensitivity of protecting actions are guaranteed.
Description
Technical field
The present invention relates to a kind of fault detection method of extra high voltage network, particularly in a kind of extra high voltage network at the fault detection method of light current source.
Background technology
Longitudinal distance protection is to utilize channel transfer block signal or allow signal, realizes selectively the method for fault completely of excision fast.Pilot protection is different according to the effect of channel transmission signal, can be divided into two kinds of enclosed type and permission formulas.
Along with the development of electric power system, electric power networks becomes gradually take the master network that 500kv is transmission line.Follow 500kv and 220kv electromagnetic looped network solution inscription of loop, there are great changes in the operational mode of some 220kv transformer stations, 220kv circuit changes between interconnection and tag wire through being everlasting, when circuit is tag wire, circuit one end becomes load side, and load side is non-transformer or has less weak mains.Now; when line-internal breaks down; the distancing element of this side may be because short circuit current be too little can not correct measurement; for the formula of permission pilot protection; light current source can not sent out and is forever permitted signal; for blocking mode pilot protection, can not stop paying out block signal, the pilot protection of circuit both sides can not be excised fault completely fast.
For addressing this problem, traditional method is that " light current source " control word is set in device, according to the throwing of this control word, moves back situation and in conjunction with the electric parameters state of this side, determines whether allowing offside tripping operation.But; variation along with operational mode; such as ice and snow disaster period in 2008; the tripping operation of transmission line large area; cause power system operation mode frequently to change; transmission line is as the part of through-put power; the function transmission direction of both sides is likely switched back and forth; be today one end to other end power transmission; and may turn in a few days power transmission around; the appearance of light current source has uncertainty, at non-light current source, drop into weak feedback control word and may cause pilot protection malfunction, light current source not input control word may cause pilot protection tripping.In this case, the urgent hope of electric power system user can realize the automatic identification of weak feedback mode, thereby improves quick-action and the reliability of relaying protection, guarantees the safety of electric power system and stablizes.
So-called weak feeder line road refers to, one end of circuit is electric power system large power supply, and the other end is for (being generally user side) is for terminal transformer or with the feeder line of the small power supply of regional load.Due to the characteristic feature of weak feedback side be negative-sequence current very little be even zero, zero-sequence current press fault type and fault point calculating, generally larger.Therefore, the existing general following criterion that adopts:
|I
0|＞m·|I
2| (1)
In formula, m is proportionality coefficient, according to actual conditions value, takes fully enough large value.I
0for weak feedback side zero-sequence current, I
2for weak feedback side negative-sequence current.
In double ended system, investigate this criterion, as shown in Figure 1, the A phase earth fault of take is example, considers the distribution of N lateral order network order electric current, and this criterion can be obtained by system parameters:
In formula: Z
os=Z
0L+ Z
0m+ Z
0n, Z
2s=Z
2L+ Z
2m+ Z
2n.K is fault point, Z
oSfor system equivalence zero sequence impedance, Z
0Lfor circuit zero sequence impedance, Z
oMfor M side power supply zero sequence impedance, Z
0Nn side power supply zero sequence impedance, Z
2Sfor system equivalence negative sequence impedance, Z
2Lcircuit negative sequence impedance, Z
2Mfor M side power supply negative sequence impedance, Z
2Nfor N side power supply negative sequence impedance.
From formula (1), m value is more difficult, the position of itself and fault point, and the order impedance of two end systems all has relation.Though it is simple that the method realizes principle, for different weak electricity systems, need different definite values, value difficulty is larger, and can not accurately judge in some cases weak feedback mode.
Summary of the invention
The object of this invention is to provide a kind of adaptive weak feedback fault detection method, the technical problem that solve is to improve the weak feedback mode accuracy of identification automatically, and then improves quick-action and the reliability of weak feedback protection.
The present invention is by the following technical solutions: a kind of adaptive weak feedback fault detection method, comprise the following steps: one, protective device collects three-phase fault voltage, electric current, calculate the amplitude of each phase voltage, electric current, compare one by one, draw maximum and minimum value and corresponding separate in three-phase fault voltage, electric current; Two, protective device adopts three-phase to have the judgement of stream judgment component, and three-phase has stream criterion to be: I
a> 0.06I
n, I
b> 0.06I
n, I
c> 0.06I
n; I
afor A phase current, I
bfor B phase current, I
cfor C phase current, I
nfor rated current; Three, protective device adopts zero-sequence current, the judgement of residual voltage judgment component, and zero-sequence current, residual voltage criterion are 3I
0> 0.3I
n, 3U
0> 2V; 3I
0for zero-sequence current, 3U
0for residual voltage; Four, protective device adopts the judgement of three-phase maximum current judgment component, and criterion is I
max< I
n; I
maxfor three-phase maximum current; Five, protective device adopts the judgement of weak feedback angular difference judgment component, and criterion is that the angular difference of any biphase current in fault place three-phase current is all less than 60 degree; Six, protective device adopts the judgement of low-voltage judgment component, criterion be arbitrary phase fault voltage lower than 30V, meet low-voltage criterion, adopt weak feedback protection.
The amplitude of each phase voltage of calculating of the present invention adopts all-round Fu's formula algorithm.
Protective device of the present invention adopts three-phase to have the judgement of stream judgment component, and not meeting three-phase has stream criterion, adopts low-voltage judgment component criterion by normal protection flow process.
Protective device of the present invention adopts zero-sequence current, the judgement of residual voltage judgment component, does not meet zero-sequence current, residual voltage criterion, adopts low-voltage judgment component criterion by normal protection flow process.
Protective device of the present invention adopts the judgement of three-phase maximum current judgment component, does not meet three-phase maximum current judgement criterion, carries out the judgement of three-phase current difference, and its criterion is I
min> 0.5I
max; I
minfor three-phase minimum current.
Of the present inventionly carry out the judgement of three-phase current difference, do not meet three-phase current difference criterion, adopt low-voltage judgment component criterion, protective device adopts normal protection to transmission line.
Protective device of the present invention adopts the judgement of weak feedback angular difference judgment component, and single-phase or heterogeneous fault occurs, and adopts weak feedback protection.
The present invention compared with prior art; according to weak feedback side fault signature; by judging that the mode of weak feedback angular difference realizes the automatic identification of weak feedback side; realized dynamically weak feedback; when power system operation mode changes; can automatically identify weak feeder line road, weak feedback side drops into rapidly weak feedback protection, has guaranteed reliability and the sensitivity of protection action.
Accompanying drawing explanation
Fig. 1 is double ended system schematic diagram.
Fig. 2 is the workflow diagram of the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.As shown in Figure 2; adaptive weak feedback fault detection method of the present invention; in protective device, cancel weak feedback control word; by protective device, adopt three-phase to have stream criterion, zero-sequence current, residual voltage criterion, three-phase maximum current criterion; three-phase current difference criterion; weak feedback angular difference criterion and low-voltage criterion realize the identification of weak feedback mode, and detection failure, comprises the following steps:
Maximum and the minimum value of the three-phase voltage that, calculating protective device installation place collects; be arranged on three-phase fault voltage, electric current that the protective device of transmission line head end, end collects; adopt all-round Fu's formula algorithm to calculate the amplitude of each phase voltage, electric current; because all-round Fu's formula algorithm has stronger filter capacity; even when harmonic component is larger, still can calculate the false voltage value that protective device collects.Protective device, after calculating the false voltage of each phase, electric current, compares one by one, draws maximum and minimum value and corresponding separate in three-phase fault voltage, electric current.Voltage max, minimum value are used for differentiating low-voltage condition, if voltage max meets low-voltage condition, arbitrary phase voltage all meets low-voltage condition.Current maxima is for three-phase maximum current criterion, and current minimum is for three-phase current difference criterion.
Two, protective device adopts three-phase to have the judgement of stream judgment component, and three-phase has stream criterion to be: I
a> 0.06I
n, I
b> 0.06I
n, I
c> 0.06I
n; If do not meet three-phase, there is not stream criterion, adopt low-voltage judgment component criterion by normal protection flow process.In formula, I
afor A phase current, I
bfor B phase current, I
cfor C phase current, I
nfor rated current.
Three, protective device adopts zero-sequence current, the judgement of residual voltage judgment component, and zero-sequence current, residual voltage criterion are 3I
0> 0.3I
n, 3U
0> 2V; If do not meet zero-sequence current, residual voltage criterion, adopt low-voltage judgment component criterion by normal protection flow process.In formula, 3I
0for zero-sequence current, 3U
0for residual voltage, V is voltage unit volt.
Four, protective device adopts the judgement of three-phase maximum current judgment component, and criterion is I
max< I
nif, do not meet three-phase maximum current judgement criterion, carry out the judgement of three-phase current difference, its criterion is I
min> 0.5I
maxif, do not meet three-phase current difference criterion, adopt low-voltage judgment component criterion, protective device adopts normal protection to transmission line, and transmission line operates in the protection flow process under normal mode.I
maxfor the maximum current in the three-phase current of step 1 calculating, I
minfor the minimum current in the three-phase current of step 1 calculating.
Five, protective device adopts the judgement of weak feedback angular difference judgment component; the criterion of weak feedback angular difference judgment component is that the angular difference of any biphase current in fault place three-phase current is all less than 60 degree; i.e. three electric current homophases; if meet weak feedback angular difference criterion; think that circuit operates in weak feedback mode; if there is single-phase or heterogeneous fault, adopt weak feedback protection.When transmission line operates in weak feedback mode, if adopt normal protection, there will be the situation that can't detect fault; and cause protection that tripping occurs, to electric power system, bring very serious impact, in order to prevent this situation; so take at circuit weak feedback end, drop into weak feedback defencive function.
Six, protective device adopts the judgement of low-voltage judgment component, criterion be arbitrary phase fault voltage lower than 30V, meet low-voltage criterion, be considered as operating in weak feedback mode, adopt weak feedback protection.
A little less than method of the present invention relies on, feedback control word is not thrown to move back light current source is judged; do not adopt the criterion that zero-sequence current is larger than negative-sequence current yet; but the weak feedback side fault signature of foundation: meeting three-phase has stream criterion, zero-sequence current, residual voltage criterion, three-phase maximum current judgement criterion; by judging that the mode of weak feedback angular difference realizes the identification of weak feedback side; realized dynamically weak feedback; when power system operation mode changes; can identify weak feeder line road; weak feedback side drops into rapidly weak feedback protection, has guaranteed reliability and the sensitivity of protection action.
Method of the present invention adopts three-phase to have stream criterion; zero-sequence current, residual voltage judgment component; the poor criterion of three-phase current and weak feedback angular difference criterion, when any one does not meet, when arbitrary without stream; or zero-sequence current, residual voltage are little; or the electric current difference of three-phase is larger, or appoint a biphase current angular difference to be greater than 60 while spending, be considered as not meeting weak feedback condition; think that circuit operates in home, adopt normal protection flow process.
Embodiment: protective device adopts the DSP (TMS320C33) of TI company of Texas Instrument, is used the Composer V4.10 compilation tool of TI company.Line protection for Guangdong Power Grid 220kV electric pressure.
Calculate the maximum of three-phase voltage and the instruction of minimum value:
；；-------------------------------------------
; ; Function: the maximin of finding out three phase voltages
; ; Entry condition:
; ; Nothing
; ; Outlet: AW_FLG_Un_MAX_MIN
；；R5：bit0/1/2＝1 Ua/Ub/Uc is MAX
；； bit4/5/6＝1 Ua/Ub/Uc is MIN
；； bit3＝1
；； bit7＝1
; ; Take resource
；；R1，R2，R3，R5
；；------------------
GetUxMaxAndMin：
LDI 0，R5
LDF @AF_AM_Ua，R1
LDF @AF_AM_Ub，R2
LDF @AF_AM_Uc，R3
CMPF R2，R1
BLT FUM_CMP_A_C
；；(A＞B)
CMPF R3，R2
BGT FUM_Uc_MIN_Ua_MAX
；；(B＜C)
CMPF R3，R1
BLT FUM_Ub_MIN_Uc_MAX
；；(A＞C)＞B
FUM_Ub_MIN_Ua_MAX：
OR DB5，R5
LDF @AF_AM_Ub，R1
LDF @AF_AM_Uc，R2
BR FUM_Ua_IS_MAX
；；A＞(B＞C)
FUM_Uc_MIN_Ua_MAX：
OR DB6，R5
LDF @AF_AM_Uc，R1
LDF @AF_AM_Ub，R2
FUM_Ua_IS_MAX：
OR DB0，R5
LDF @AF_AM_Ubc，R3
BR FUM_U_POST
；；-----------------------------
；；(C＞A＞B)
FUM_Ub_MIN_Uc_MAX
OR DB5，R5
LDF @AF_AM_Ub，R1
LDF @AF_AM_Ua，R2
BR FUM_Uc_IS_MAX
FUM_Ua_MIN_Uc_MAX
OR DB4，R5
LDF @AF_AM_Ua，R1
LDF @AF_AM_Ub，R2
FUM_Uc_IS_MAX：
OR DB2，R5
LDF @AF_AM_Uab，R3
BR FUM_U_POST
；；-------------------------------
；；(A＜B)
FUM_CMP_A_C：
CMPF R3，R1
BGT FUM_Uc_MIN_Ub_MAX
；；C＞A
CMPF R3，R2
BLT FUM_Ua_MIN_Uc_MAX
；；(C＞B)＞A
FUM_Ua_MIN_Ub_MAX：
OR DB4，R5
LDF @AF_AM_Ua，R1
LDF @AF_AM_Uc，R2
BR FUM_Ub_IS_MAX
FUM_Uc_MIN_Ub_MAX： ；；
OR DB6，R5
LDF @AF_AM_Uc，R1
LDF @AF_AM_Ua，R2
FUM_Ub_IS_MAX：
OR DB1，R5
LDF @AF_AM_Uca，R3
FUM_U_POST：
；；------------------------------
CMPF @MF_U30V，R1
BGT FUM_CHK_UMIN_POST
OR DB3，R5
FUM_CHK_UMIN_POST：
CMPF @MF_U30V，R3
BGT FUM_CHK_ULMIN_POST
OR DB7，R5
FUM_CHK_ULMIN_POST：
STI R5，@AW_FLG_Un_MAX_MIN
RETS
；------------------------------------------。
Adopt three-phase to have the instruction of stream judgment component judgement:
SickSideJudge：
CALL GetUxMaxAndMin
LDI 0，R7
LD I@AW_FLG_SYSTEM，R0
AND 07H，R0
CMPI 07H，R0
BNE SSJ_ULOW_JUDGE。
Adopt the instruction of zero-sequence current, residual voltage judgment component:
LDF @AF_AM_3I0，R0
CMPF @AF_SET_300A，R0
BLT SSJ_ULOW_JUDGE
LDF @AF_AM_3U0，R0
CMPF @MF_U2V，R0
BLT SSJ_ULOW_JUDGE。
Adopt the instruction of three-phase maximum current judgment component judgement:
LDF @AF_AM_Ia，R0
CMPF @AF_AM_Ib，R0
LDFLT @AF_AM_Ib，R0
CMPF @AF_AM_Ic，R0
LDFLT @AF_AM_Ic，R0
CMPF @MF_100In，R0
BLT SSJ_IABC_JUDGE_POST
LDF @AF_AM_Ia，R1
CMPF @AF_AM_Ib，R1
LDFGT @AF_AM_Ib，R1
CMPF @AF_AM_Ic，R1
LDFGT @AF_AM_Ic，R1
MPYF 0.5*0.5，R0
CMPF R0，R1
BLT SSJ_ULOW_JUDGE。
Adopt the instruction of weak feedback angular difference judgment component judgement:
SSJ_IABC_JUDGE_POST：
; ; Whether the angular difference calculating between IA and IB is less than 60 degree
LDI CW_SIa，IR0
LDI CW_SIb，IR1
LDF CF_TAN60，R2
CALL CalVecAngDiff; ; Use R0～R6, AR0
CMPI 055H，R5
BNE SSJ_IA_IB_POST
OR DB0，R7
SSJ_IA_IB_POST：
; ; Whether the angular difference calculating between IB and IC is less than 60 degree
LDI CW_SIb，IR0
LDI CW_SIc，IR1
LDF CF_TAN60，R2
CALL CalVecAngDiff; ; Use R0～R6, AR0
CMPI 055H，R5
BNE SSJ_IB_IC_POST
OR DB1，R7
SSJ_IB_IC_POST：
; ; Whether the angular difference calculating between IC and IA is less than 60 degree
LDI CW_SIc，IR0
LDI CW_SIa，IR1
LDF CF_TAN60，R2
CALL CalVecAngDiff; ; Use R0～R6, AR0
CMPI 055H，R5
BNE SSJ_IC_IA_POST
OR DB2，R7
SSJ_IC_IA_POST：
；；----------------------------------------------
; ; Function: whether the angular difference calculating between two vectors is less than ang degree (0～90)
; ; Entrance:
; ; First vectorial real part sequence number of IR0--, adds 1 for imaginary part
; ; Second vectorial real part sequence number of IR1--, adds 1 for imaginary part
; ; R2--angle tangent value
; ; Outlet:
; ; R5--55 represents to meet; 0 does not meet
; ; Intermediate variable: R3, R4, R5, R6
CalVecAngDiff：
LDI@AF_ADDR_JL_CAL, AR0; AR0 finishes not allow before to change to calculating
LDF *+AR0(IR0)，R0
ADDI 1，IR0
LDF *+AR0(IR0)，R1
LDF *+AR0(IR1)，R3
ADDI 1，IR1
LDF *+AR0(IR1)，R4
MRC_MUL_XY R0，R1，R3，R4，R5，R6
; ; Calculate: X* (Y^)
; ; The imaginary part of the real part B--X of A--X
; ; The imaginary part of the real part D--Y of C--Y
; ; E--intermediate variable F--intermediate variable
; ; During outlet
; ; The imaginary part of the real part B--result of A--result
LDI 055H，R5
CMPF 0，R0
BLT CVAD_CLR; ; Real part Re is less than 0, is 2,4 quadrants
ABSF R1
MPYF R2，R0 ；；Re*tan(ang)
CMPF R0，R1
BLT CVAD_END; ; Im < Re*tan (ang), meets angular difference, and putting R5 is 55
CVAD_CLR：
LDI 0，R5
CVAD_END：
RETS
；；-------------------------------------------。
Adopt the instruction of low-voltage judgment component judgement:
SSJ_ULOW_JUDGE：
LDI @AW_FLG_Un_MAX_MIN，R5
TSTB DB3，R5 ；；Umin＜30v
BZ SSJ_SAVE_FLAG
OR DB3，R7
SSJ_SAVE_FLAG：
STI R7，@AW_FLG_IANGDIFF
RETS
；；-------------------------------------------。
Claims (7)
1. an adaptive weak is presented fault detection method, comprise the following steps: one, protective device collects three-phase fault voltage, electric current, the amplitude of calculating each phase voltage, electric current, compares one by one, draws maximum and minimum value and corresponding separate in three-phase fault voltage, electric current; Two, protective device adopts three-phase to have the judgement of stream judgment component, and three-phase has stream criterion to be: I
a>0.06I
n, I
b>0.06I
n, I
c>0.06I
n; I
afor A phase current, I
bfor B phase current, I
cfor C phase current, I
nfor rated current, meeting three-phase has stream criterion, enters next step; Three, protective device adopts zero-sequence current, the judgement of residual voltage judgment component, and zero-sequence current, residual voltage criterion are 3I
0>0.3I
n, 3U
0>2V; 3I
0for zero-sequence current, 3U
0for residual voltage, meet zero-sequence current, residual voltage criterion, enter next step; Four, protective device adopts the judgement of three-phase maximum current judgment component, and criterion is I
max<I
n; I
maxfor three-phase maximum current, meet three-phase maximum current judgement criterion, enter next step; Five, protective device adopts the judgement of weak feedback angular difference judgment component, and criterion is that the angular difference of any biphase current in fault place three-phase current is all less than 60 degree, meets weak feedback angular difference criterion, enters next step; Six, protective device adopts low pressure judgment component to judge, criterion be arbitrary phase fault voltage lower than 30V, meet low-voltage judgment component criterion, adopt weak feedback protection.
2. adaptive weak feedback fault detection method according to claim 1, is characterized in that: the amplitude of described each phase voltage of calculating adopts all-round Fu's formula algorithm.
3. adaptive weak according to claim 1 is presented fault detection method; it is characterized in that: described protective device adopts three-phase to have the judgement of stream judgment component, and not meeting three-phase has stream criterion, adopts low-voltage judgment component criterion; do not meet low-voltage judgment component criterion, by normal protection flow process.
4. adaptive weak according to claim 1 is presented fault detection method; it is characterized in that: described protective device adopts zero-sequence current, the judgement of residual voltage judgment component; do not meet zero-sequence current, residual voltage criterion; adopt low-voltage judgment component criterion; do not meet low-voltage judgment component criterion, by normal protection flow process.
5. adaptive weak feedback fault detection method according to claim 1, is characterized in that: described protective device adopts the judgement of three-phase maximum current judgment component, does not meet three-phase maximum current judgement criterion, carries out the judgement of three-phase current difference, and its criterion is I
min>0.5I
max; I
minfor three-phase minimum current.
6. adaptive weak according to claim 5 is presented fault detection method; it is characterized in that: described in carry out the judgement of three-phase current difference; do not meet three-phase current difference criterion; adopt low-voltage judgment component criterion; do not meet low-voltage judgment component criterion, protective device adopts normal protection to transmission line.
7. adaptive weak according to claim 1 is presented fault detection method; it is characterized in that: described protective device adopts the judgement of weak feedback angular difference judgment component; criterion is that the angular difference of any biphase current in fault place three-phase current is all less than 60 degree; it is three-phase current homophase; if meet weak feedback angular difference criterion; think that circuit operates in weak feedback mode, if there is single-phase or heterogeneous fault, adopt weak feedback protection.
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