CN109884476B - Method for judging fault direction of tie line suitable for double-fed power access - Google Patents

Method for judging fault direction of tie line suitable for double-fed power access Download PDF

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CN109884476B
CN109884476B CN201910314434.1A CN201910314434A CN109884476B CN 109884476 B CN109884476 B CN 109884476B CN 201910314434 A CN201910314434 A CN 201910314434A CN 109884476 B CN109884476 B CN 109884476B
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power grid
set1
current
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CN109884476A (en
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刘玮
王增超
王育学
刘慧媛
敖建永
林清华
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Guangdong Power Grid Co Ltd
Yangjiang Power Supply Bureau of Guangdong Power Grid Co Ltd
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Yangjiang Power Supply Bureau of Guangdong Power Grid Co Ltd
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Abstract

The invention belongs to the technical field of power systems, and particularly relates to a method for judging the fault direction of a connecting line suitable for double-fed power access. The method improves the accuracy of judging the fault direction of the tie line and effectively ensures the safe operation of the power grid.

Description

Method for judging fault direction of tie line suitable for double-fed power access
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a method for judging fault direction of a tie line suitable for double-fed power access.
Background
With the rapid development and the gradual improvement of new energy technologies, double-fed power plants represented by double-fed wind generating sets have been applied to the power grid on a large scale. The short-circuit current characteristics provided by the double-fed power station when the power grid has a short-circuit fault are greatly different from those of the traditional synchronous generator, so that the fault direction cannot be correctly judged when the traditional direction element is applied to the protection of a power collecting line and a connecting line, and further the protection is possibly refused to be operated or is operated mistakenly.
In order to solve the above problems, related research works have been carried out, mainly including: whether the direction element is suitable for a wind power access system or not is analyzed (Chennhao, Zhang jin Hua, Zhang Bao. applicability analysis of the direction element in a doubly-fed wind power plant collection line [ J ]. Chinese Motor engineering bulletin, 2018, 38 (21): 6324) and 6332.), but the applicability of the direction element in the collection line in a 90-degree wiring mode is only demonstrated, and the applicability of the direction element in a connecting line is not explained; aiming at the applicability of the fault component directional element, an equivalent sequence mutation impedance based analysis method (J. China Motor engineering report 2016, 36 (14): 3929 plus 3939) is provided (from Huangtao, Lueping, Chuia super. DFIG equivalent sequence mutation impedance phase angle characteristics on the fault component directional element), but only the problems existing when the positive sequence fault directional element and the negative sequence fault directional element are applied to a wind power access system are explained, and an improvement method or a new criterion is not provided. In summary, the current fault direction determination method for the dual-fed power access is not well researched and has limited effect.
Disclosure of Invention
The invention provides a method for judging the fault direction of a connecting line suitable for double-fed power access, which aims to overcome at least one defect in the prior art, perfects the method for judging the fault direction of the connecting line and effectively ensures the safe operation of a power grid.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for judging the fault direction of a tie line suitable for double-fed power access comprises the following steps:
s1: collecting positive sequence current I at protection installation1Positive sequence voltage U1Negative sequence voltage U2Zero sequence current I0Zero sequence voltage U0And maximum phase current amplitude
Figure GDA0002689930850000011
S2: will negative sequence voltage U2And a threshold value Uset2Comparison, if U2＞Uset2Then judging that the power grid has an asymmetric fault and judging that the negative sequence voltage threshold value U is generatedset2The range of 2V to 5V is entered to step S3; if not, judging that the power grid has a symmetric fault, and entering the step S6;
s3: zero sequence voltage U0And a threshold value Uset0Comparison, zero sequence voltage threshold Uset0In the range of 2V to 5V if U0＞Uset0Judging that the power grid has an asymmetric grounding fault, and entering S4; if not, judging that the two-phase short circuit fault occurs in the power grid, and entering the step S5;
s4: and (3) judging the direction of the asymmetrical earth fault:
zero sequence current I0And a threshold value Iset0By comparison, if I0＞Iset0Defining the direction of current flowing from the doubly-fed power supply to the power grid as positive: if it is
Figure GDA0002689930850000021
Indicating the occurrence of a "forward" fault; if not, indicating that a "reverse" fault has occurred,
Figure GDA0002689930850000022
is the zero sequence sensitive angle of the directional element, the value is 45 degrees, j is the imaginary part symbol in the vector operation, I0Is zero sequence current;
if I0＜Iset0The maximum phase current amplitude value
Figure GDA0002689930850000023
And a threshold value IsetmaxIn comparison, if
Figure GDA0002689930850000024
Judging that the power grid has a reverse fault; if it is
Figure GDA0002689930850000025
Then the grid is judgedOccurrence of a "Forward" failure, threshold Iset0Value of 0.1INThreshold value IsetmaxValue of 2IN，INIs a secondary side current rating;
s5: and (3) judging the direction of the two-phase short circuit fault:
amplitude of maximum phase current
Figure GDA0002689930850000026
And a threshold value IsetmaxIn comparison, if
Figure GDA0002689930850000027
Judging that the power grid has a reverse fault;
if it is
Figure GDA0002689930850000028
Will be positive sequence current I1And a threshold value Iset1By comparison, if I1＜Iset1Judging that the power grid has a forward fault;
if I1＞Iset1Defining the direction of current flowing from the doubly-fed power supply to the power grid as positive: if it satisfies
Figure GDA0002689930850000029
Figure GDA00026899308500000210
Indicating that a "forward" fault has occurred; if not, indicating that a "reverse" fault has occurred, threshold Iset1Value of 0.1IN，
Figure GDA00026899308500000211
Is a positive sequence sensitive angle of a direction element, and takes the value of 45 degrees, I1Is a positive sequence current, INIs a secondary side current rating;
s6: and (3) judging the direction of the symmetrical fault:
amplitude of maximum phase current
Figure GDA00026899308500000212
And a threshold value
Figure GDA00026899308500000215
In comparison, if
Figure GDA00026899308500000213
Judging that the power grid has a reverse fault;
if it is
Figure GDA00026899308500000214
Will be positive sequence current I1And a threshold value Iset1By comparison, if I1＜Iset1Judging that the power grid has a forward fault;
if I1＞Iset1Further comparing the positive sequence voltage U1And a threshold value Uset1If U is present1＜Uset1Judging that the power grid has a forward fault;
if U is1＞Uset1Defining the direction of current flowing from the doubly-fed power supply to the power grid as positive: if it satisfies
Figure GDA0002689930850000031
Figure GDA0002689930850000032
Indicating the occurrence of a "forward" fault, I1Is a positive sequence current; if not, indicating that a reverse fault has occurred, a threshold value Uset1The value is 0.1-0.15UN，UNIs the secondary side voltage rating.
Compared with the prior art, the invention has the following characteristics:
the method for judging the fault direction of the tie line utilizes the short-circuit current fault characteristics of the doubly-fed power supply to obtain the corresponding direction criterion, can accurately and quickly judge the fault direction, and can meet the fault direction judging requirement of doubly-fed power supply tie line protection.
Drawings
FIG. 1 is a schematic flow chart of a method in an embodiment of the present invention.
Fig. 2 is a simulation model of a power grid including a double-fed power supply field according to an embodiment of the present invention.
Detailed Description
The drawings are for illustration purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Example (b):
as shown in fig. 1, the present invention provides a method for determining a fault direction of a tie line suitable for a dual-fed power access, wherein the method comprises the following steps:
s1: collecting positive sequence current I at protection installation1Positive sequence voltage U1Negative sequence voltage U2Zero sequence current I0Zero sequence voltage U0And maximum phase current amplitude
Figure GDA0002689930850000033
S2: will negative sequence voltage U2And a threshold value Uset2Comparison, if U2＞Uset2Then judging that the power grid has an asymmetric fault and judging that the negative sequence voltage threshold value U is generatedset2The range of 2V to 5V is entered to step S3; if not, judging that the power grid has a symmetric fault, and entering the step S6;
s3: zero sequence voltage U0And a threshold value Uset0Comparison, zero sequence voltage threshold Uset0In the range of 2V to 5V if U0＞Uset0Judging that the power grid has an asymmetric grounding fault, and entering S4; if not, judging that the two-phase short circuit fault occurs in the power grid, and entering the step S5;
s4: and (3) judging the direction of the asymmetrical earth fault:
zero sequence current I0And a threshold value Iset0By comparison, if I0＞Iset0Defining the direction of current flowing from the doubly-fed source to the grid as positive, if
Figure GDA0002689930850000041
Indicating the occurrence of a "forward" fault; if not, indicating that a "reverse" fault has occurred,
Figure GDA0002689930850000042
is a zero sequence sensitive angle of a direction element and takes 45 degrees, I0Is zero sequence current;
if I0＜Iset0The maximum phase current amplitude value
Figure GDA0002689930850000043
And a threshold value IsetmaxIn comparison, if
Figure GDA0002689930850000044
Judging that the power grid has a reverse fault; if it is
Figure GDA0002689930850000045
Judging that the power grid has a forward fault, and a threshold value Iset0Value of 0.1INThreshold value IsetmaxValue of 2IN，INIs a secondary side current rating;
s5: and (3) judging the direction of the two-phase short circuit fault:
amplitude of maximum phase current
Figure GDA0002689930850000046
And a threshold value IsetmaxIn comparison, if
Figure GDA0002689930850000047
Judging that the power grid has a reverse fault;
if it is
Figure GDA0002689930850000048
Will be positive sequence current I1And a threshold value Iset1By comparison, if I1＜Iset1Judging that the power grid has a forward fault;
if I1＞Iset1Defining the direction of current flowing from the doubly-fed power supply to the power grid as positive: if it satisfies
Figure GDA0002689930850000049
Figure GDA00026899308500000410
Indicating that a "forward" fault has occurred; if not, indicating that a "reverse" fault has occurred, threshold Iset1Value of 0.1IN，
Figure GDA00026899308500000411
Is a positive sequence sensitive angle of a direction element, and takes the value of 45 degrees, I1Is a positive sequence current, INIs a secondary side current rating;
s6: and (3) judging the direction of the symmetrical fault:
amplitude of maximum phase current
Figure GDA00026899308500000412
And a threshold value IsetmaxIn comparison, if
Figure GDA00026899308500000413
Judging that the power grid has a reverse fault;
if it is
Figure GDA00026899308500000414
Will be positive sequence current I1And a threshold value Iset1By comparison, if I1＜Iset1Judging that the power grid has a forward fault;
if I1＞Iset1Further comparing the positive sequence voltage U1And a threshold value Uset1If U is present1＜Uset1Judging that the power grid has a forward fault;
if U is1＞Uset1Defining the direction of current flowing from the doubly-fed power supply to the power grid as positive: if it satisfies
Figure GDA0002689930850000051
Figure GDA0002689930850000052
Indicating that a "forward" fault has occurred; if not, indicating that a "reverse" fault has occurred, I1For positive sequence current, threshold Uset1The value is 0.1-0.15UN，UNIs the secondary side voltage rating.
As shown in fig. 2, the power grid model has AB two-phase metallic ungrounded fault at f1 (4 km from protection), and the basic parameters of the power grid simulation model are described as follows:
system side equivalent impedance is z(1)＝z(2)＝(2.7+15.26j)Ω，z(0)(6.42+32.12j) Ω. The length of the connecting line L is 8km, and the line parameters of the unit length are as follows: r is(1)＝r(2)＝0.079Ω/km，x(1)＝x(2)＝0.39Ω/km，r(0)＝0.229Ω/km，x(0)1.172 Ω/km. The transformation ratio of the transformer T1 is 35/0.69kV, the short-circuit impedance is 6.5%, and the capacity is 53 MVA; the transformer T2 had a transformation ratio of 110/35kV, a short-circuit resistance of 11.26%, and a capacity of 53 MVA. The double-fed power supply adopts a balance torque control strategy, and the power generation capacity is 48 MVA.
The fault direction is judged by adopting the fault direction judging method suitable for the double-fed power supply access provided by the invention, and the fault direction judging method comprises the following steps:
calculating the positive sequence current I at the protection installation1Positive sequence voltage U1Negative sequence voltage U2Zero sequence current I0Zero sequence voltage U0And maximum phase current amplitude
Figure GDA0002689930850000056
As shown in fig. 2, for the protection installation position in the figure, the post-fault positive sequence voltage leads the positive sequence current by 6 °, and the calculated amplitudes of the respective electric quantities are as follows:
Figure GDA0002689930850000053
in the table, the voltage and current values are secondary values, and when the device operates at a rated voltage, the voltage is 100V, and the current is 1A.
(1) Negative sequence voltage U2And a threshold value Uset2Comparing the sizes, if Uset2Take 5V, by U2＞Uset2And judging the fault as an asymmetric fault.
(2) Zero sequence voltage U0And a threshold value Uset0Comparing the sizes, if Uset0Take 5V, by U0＜Uset0And judging the fault as a two-phase short-circuit fault.
(3) Amplitude of maximum phase current
Figure GDA0002689930850000054
And a threshold value IsetmaxCompare the sizes, if
Figure GDA0002689930850000055
Judging that the power grid has a reverse fault;
if it is
Figure GDA0002689930850000061
Will be positive sequence current I1And a threshold value Iset1By comparison, if I1＜Iset1Judging that the power grid has a forward fault;
if I1＞Iset1If it satisfies
Figure GDA0002689930850000062
Indicating that a "forward" fault has occurred; if not, it indicates that a "reverse" fault has occurred.
Let IsetmaxTaking 2A, Iset1Taking out the mixture of 0.1A,
Figure GDA0002689930850000063
take 45 degrees. As far as the protection is concerned, the protection,
Figure GDA0002689930850000064
Figure GDA0002689930850000065
I1＝0.94＞0.1＝Iset1and is and
Figure GDA0002689930850000066
the fault is shown to occur in the 'forward direction', and the obtained result is consistent with the actual fault direction.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (7)

1. A method for judging the fault direction of a tie line suitable for double-fed power access is characterized by comprising the following steps:
s1: collecting positive sequence current I at protection installation1Positive sequence voltage U1Negative sequence voltage U2Zero sequence current I0Zero sequence voltage U0And maximum phase current amplitude
Figure FDA0002689930840000011
S2: will negative sequence voltage U2And a threshold value Uset2Comparison, if U2＞Uset2If so, judging that the power grid has an asymmetric fault, and entering step S3; if it isIf not, judging that the power grid has a symmetric fault, and entering the step S6;
s3: zero sequence voltage U0And a threshold value Uset0Comparison, if U0＞Uset0If so, judging that the power grid has an asymmetric grounding fault, and entering S4; if not, judging that the two-phase short circuit fault occurs in the power grid, and entering the step S5;
s4: and (3) judging the direction of the asymmetrical earth fault:
zero sequence current I0And a threshold value Iset0By comparison, if I0＞Iset0Defining the direction of current flowing from the doubly-fed source to the grid as positive, if
Figure FDA0002689930840000012
Indicating the occurrence of a "forward" fault; if not, indicating that a "reverse" fault has occurred,
Figure FDA0002689930840000013
is the zero sequence sensitive angle of the directional element, j is the imaginary symbol in the vector operation, I0Is zero sequence current;
if I0＜Iset0The maximum phase current amplitude value
Figure FDA0002689930840000014
And a threshold value IsetmaxIn comparison, if
Figure FDA0002689930840000015
Judging that the power grid has a reverse fault; if it is
Figure FDA0002689930840000016
Judging that the power grid has a forward fault;
s5: and (3) judging the direction of the two-phase short circuit fault:
amplitude of maximum phase current
Figure FDA0002689930840000017
And a threshold value IsetmaxIn comparison, if
Figure FDA0002689930840000018
Judging that the power grid has a reverse fault;
if it is
Figure FDA0002689930840000019
Will be positive sequence current I1And a threshold value Iset1By comparison, if I1＜Iset1Judging that the power grid has a forward fault;
if I1＞Iset1Defining the direction of current flowing from the doubly-fed power supply to the power grid as positive: if it satisfies
Figure FDA0002689930840000021
Figure FDA0002689930840000022
Indicating that a "forward" fault has occurred; if not, indicating that a "reverse" fault has occurred,
Figure FDA0002689930840000023
is the positive-sequence sensitive angle of the directional element, I1Is a positive sequence current;
s6: and (3) judging the direction of the symmetrical fault:
amplitude of maximum phase current
Figure FDA0002689930840000024
And a threshold value IsetmaxIn comparison, if
Figure FDA0002689930840000025
Judging that the power grid has a reverse fault;
if it is
Figure FDA0002689930840000026
Will be positive sequence current I1And a threshold value Iset1By comparison, if I1＜Iset1Judging that the power grid has a forward fault;
if I1＞Iset1Comparing the positive sequence voltage U1And a threshold value Uset1If U is present1＜Uset1Judging that the power grid has a forward fault;
if U is1＞Uset1Defining the direction of current flowing from the doubly-fed power supply to the power grid as positive: if it satisfies
Figure FDA0002689930840000027
Indicating that a "forward" fault has occurred; if not, indicating that a "reverse" fault has occurred, I1Is a positive sequence current.
2. The method as claimed in claim 1, wherein in step S2, the negative sequence voltage threshold U is set to be equal to or greater than Uset2The range is 2V-5V.
3. The method as claimed in claim 1, wherein in step S3, the zero sequence voltage threshold U is set to be equal to or greater than the predetermined valueset0The range is 2V-5V.
4. The method as claimed in claim 1, wherein the threshold I in step S4 is set asset0Value of 0.1INThreshold value IsetmaxValue of 2IN，INIs the secondary side current rating.
5. The method as claimed in claim 1, wherein the step S5 is executed by a threshold Iset1Value of 0.1IN，INIs the secondary side current rating.
6. The method for determining the fault direction of the tie line suitable for the dual feed type power access of claim 1, wherein in the step S6, the threshold is setValue Uset1The value is 0.1-0.15UN，UNIs the secondary side voltage rating.
7. The method as claimed in claim 1, wherein the method for determining the fault direction of the tie line is further characterized in that the tie line is further configured to be connected to a power supply of a dual feed type
Figure FDA0002689930840000031
And
Figure FDA0002689930840000032
is 45 degrees.
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