CN112345879A - Direct-current transmission line fault direction judgment method and system with strong anti-jamming capability - Google Patents

Direct-current transmission line fault direction judgment method and system with strong anti-jamming capability Download PDF

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CN112345879A
CN112345879A CN202010972833.XA CN202010972833A CN112345879A CN 112345879 A CN112345879 A CN 112345879A CN 202010972833 A CN202010972833 A CN 202010972833A CN 112345879 A CN112345879 A CN 112345879A
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current
line
calculating
value
differential value
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CN112345879B (en
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曹虹
周泽昕
柳焕章
王兴国
杜丁香
阮思烨
张志�
刘丹
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

Abstract

The invention discloses a method and a system for judging the fault direction of a direct current transmission line with strong anti-jamming capability, wherein the method comprises the following steps: determining a protection side of a middle pole line of a direct current line; collecting protection side line current i in k-time direct current lineM(k) (ii) a Calculating the abrupt change quantity delta i of the protection side current in the direct current line at the moment kM(k) Calculating the differential value di of the protection side current in the DC line at the time kM(k) Calculating the negative rate of change current i∑‑(t); based on the current iM(k) The current variation amount delta iM(k) And said differential value diM(k) Calculating a composite integral value of the current break variable and the differential value; based on the negative rate of change current i∑‑(t) calculating a threshold value; and when the composite integral value of the current break variable and the differential value is larger than the threshold value, judging that the direct current line has a positive direction fault.

Description

Direct-current transmission line fault direction judgment method and system with strong anti-jamming capability
Technical Field
The invention relates to the technical field of relay protection, in particular to a method and a system for judging the fault direction of a direct-current transmission line with strong anti-jamming capability.
Background
Compared with the traditional alternating current transmission system, the high-voltage direct current transmission system has the advantages of large transmission capacity, long transmission distance, low loss and the like, and is widely applied to the aspects of long-distance transmission, large-area power grid interconnection, underground cable transmission and the like. The high-voltage direct-current transmission line is responsible for electric energy transmission between the shoulder load energy production place and the load center, the transmission distance is long, the operation condition is severe, the fault rate is higher than that of other parts of the direct-current system, and the fault rate accounts for about 50% of the fault rate of the direct-current system. Therefore, the protection of the high-performance high-voltage direct-current transmission line has important significance for improving the safety and stability of the whole power grid.
In the prior art, the direct current transmission line protection takes traveling wave protection and differential undervoltage protection as main protection, directional elements are not configured independently, and the transient resistance tolerance is poor.
Disclosure of Invention
The technical scheme of the invention provides a method and a system for judging the fault direction of a direct current transmission line with strong anti-jamming capability, so as to solve the problem of judging the fault direction of the direct current transmission line.
In order to solve the above problems, the present invention provides a method for determining a fault direction of a dc transmission line with strong interference rejection capability, the method comprising:
determining a protection side of a middle pole line of a direct current line;
collecting k time protection side line current iM(k)；
Calculating the abrupt change quantity delta i of the protection side current in the direct current line at the moment kM(k) Calculating the differential value di of the protection side current in the DC line at the time kM(k) Calculating the negative rate of change current i∑-(t)，
Based on the current iM(k) The current variation amount delta iM(k) And said differential value diM(k) Calculating a composite integral value of the current break variable and the differential value;
based on the negative rate of change current i∑-(t) calculating a threshold value;
and when the composite integral value of the current break variable and the differential value is larger than the threshold value, judging that the direct current line has a positive direction fault.
Preferably, the inverse time limit value isetLThe calculation method is as follows:
Figure BDA0002684719730000021
γ1is a slope coefficient, γ2As intercept coefficient, T1The window length is calculated for the inverse time limit.
Preferably, said i∑-(t) the calculation method is as follows:
Figure BDA0002684719730000022
wherein T is the floating threshold calculation window length, negative slope current
Figure BDA0002684719730000023
Comprises the following steps:
Figure BDA0002684719730000024
preferably, the method further comprises the following steps: when in use
Figure BDA0002684719730000025
And if so, judging that the direct current line has a reverse fault.
Preferably, said current i is based onM(k) The current variation amount delta iM(k) And said differential value diM(k) Calculating a composite integral value of the current transient and the differential value, comprising:
Figure BDA0002684719730000026
wherein n is t0Sampling points between t and t; t is t0To protect the starting moment; t is the current calculation time; f. ofsIs the sampling frequency, mu is the difference coefficient;
the current i based on the negative rate of change∑-(t) calculating a threshold value comprising:
Figure BDA0002684719730000027
wherein isetLIs a reverse time limit.
Based on another aspect of the present invention, the present invention provides a system for determining a fault direction of a dc power transmission line with strong anti-interference capability, the system comprising:
a calculation unit for determining the protection side of the middle pole line of the DC line and collecting the line current i of the protection side at the moment kM(k) Calculating the abrupt change quantity delta i of the protection side current in the direct current line at the moment kM(k) Calculating the differential value di of the protection side current in the DC line at the time kM(k) Calculating the negative rate of change current i∑-(t)；
Based on the current iM(k) The current variation amount delta iM(k) And said differential value diM(k) Calculating a composite integral value of the current break variable and the differential value;
based onThe negative rate of change current i∑-(t) calculating a threshold value;
and the judging unit is used for judging that the direct current line has positive direction fault when the composite integral value of the current break variable and the differential value is greater than the threshold value.
Preferably, the inverse time limit value isetLThe calculation method is as follows:
Figure BDA0002684719730000031
γ1is a slope coefficient, γ2As intercept coefficient, T1The window length is calculated for the inverse time limit.
Preferably, said i∑-(t) the calculation method is as follows:
Figure BDA0002684719730000032
wherein T is the floating threshold calculation window length, negative slope current
Figure BDA0002684719730000036
Comprises the following steps:
Figure BDA0002684719730000033
preferably, the judging unit is further configured to: when in use
Figure BDA0002684719730000034
And if so, judging that the direct current line has a reverse fault.
Preferably, the calculation unit is configured to calculate the current i based on the currentM(k) The current variation amount delta iM(k) And said differential value diM(k) Calculating a composite integral value of the current transient and the differential value, comprising:
Figure BDA0002684719730000035
wherein n is t0Sampling points between t and t; t is t0To protect the starting moment; t is the current calculation time; f. ofsIs the sampling frequency, mu is the difference coefficient;
the calculation unit is used for calculating the negative change rate current i∑-(t) calculating a threshold value comprising:
Figure BDA0002684719730000041
wherein isetLIs a reverse time limit.
The invention provides a high-reliability high-speed fault direction judging method which is strong in anti-interference capability, reliable and non-acting when a fault occurs in a reverse direction, and quick and reliable acting when a positive direction metal fault occurs and a high resistance fault occurs.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a schematic structural diagram of a direct current transmission line according to a preferred embodiment of the present invention;
FIG. 2 is a view showing the forward end F protected according to the preferred embodiment of the present invention2A metallic fault schematic;
FIG. 3 is a view showing the forward end F being protected according to the preferred embodiment of the present invention 2500 Ω high resistance fault diagram; and
FIG. 4 is a protection reverse F according to a preferred embodiment of the present invention3A metallic fault schematic; and
fig. 5 is a structural diagram of a fault direction determination system of a direct current transmission line with strong anti-interference capability according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a schematic structural diagram of a direct current transmission line according to a preferred embodiment of the present invention.
The schematic diagram of the DC system of the invention is shown in the attached figure 1. The rectifying side is the M side, and the inverting side is the N side. Taking M-side direct current protection of polar I line as a research object, IMIs the current value of the M side of the DC line, iNThe positive direction of the current is the polar bus pointing line for the current value of the N side of the direct current line.
A method for judging the fault direction of a direct current transmission line with strong anti-jamming capability comprises the following steps:
determining a protection side of a middle pole line of a direct current line;
collecting k time protection side line current iM(k)；
Calculating the abrupt change quantity delta i of the protection side current in the direct current line at the moment kM(k) Calculating the differential value di of the protection side current in the DC line at the time kM(k) Calculating the negative rate of change current i∑-(t)；
Wherein:
calculating the abrupt change quantity delta i of the protection side current in the direct current line at the time MM(k)，ΔiM(k)＝ΔiM(k)＝iM(k)-ibe(k)iM(k) For the current sample value, ibe(k) The current sampling value is 10ms before the protection is started;
calculating the differential value di of the protection side current in the DC line at the time kM(k)，diM(k)＝iM(k)-iM(k-1)iM(k-1) is the previous time of the current timeCurrent sampling values at the moment;
based on current iM(k) Delta i of currentM(k) The sum differential value diM(k) Calculating a composite integral value of the current transient and the differential value, comprising:
Figure BDA0002684719730000051
wherein n is t0Sampling points between t and t; t is t0To protect the starting moment; t is the current calculation time; f. ofsIs the sampling frequency, v is the difference coefficient;
the current i based on the negative rate of change∑-(t) calculating a threshold value comprising:
Figure BDA0002684719730000052
wherein isetLIs a reverse time limit.
Wherein the threshold value is the difference between the fixed threshold and the floating threshold. And when the composite integral value of the current break variable and the differential value is greater than the threshold value, judging that the direct current line has a positive direction fault.
When in use
Figure BDA0002684719730000053
And if so, judging that the direct current line has a positive direction fault.
Preferably, the value i is defined in the inverse timesetLThe calculation method is as follows:
Figure BDA0002684719730000061
γ1is a slope coefficient, γ2As intercept coefficient, T1The window length is calculated for the inverse time limit.
Preferably, i∑-(t) the calculation method is as follows:
Figure BDA0002684719730000062
wherein T is the floating threshold calculation window length, negative slope current
Figure BDA0002684719730000063
Comprises the following steps:
Figure BDA0002684719730000064
preferably, the method further comprises the following steps: when in use
Figure BDA0002684719730000065
And if so, judging that the direct current line has a reverse fault.
In the invention:
Figure BDA0002684719730000066
wherein i∑Is the amount of directional motion, Δ iM(k) The current sudden change amount di of the side M of the DC line at the time kM(k) Is the differential value of the current on the M side of the DC line at time k, t0To protect the starting moment; k is the current moment of protection calculation; n is t0Sampling points between t and t; f. ofsMu is the difference coefficient for the sampling frequency. i.e. iset2To determine the value, i, for the directionsetLTo define the value, i, for the inverse time∑-Is a negative slope threshold.
Figure BDA0002684719730000067
γ1Is a slope coefficient, γ2As intercept coefficient, T1For the inverse time limit calculation window length, T < 5ms is recommended.
Figure BDA0002684719730000071
In the case of a negative slope current,
Figure BDA0002684719730000072
t is floating threshold calculation windowLong, T < 5ms is recommended.
The invention provides a method for judging the fault direction of a direct current transmission line with strong anti-jamming capability, which comprises the following steps:
(1) as shown in fig. 1, the M-side dc protection of the I-pole line is taken as a research object, and the N-side protection and the II-pole line protection of the I-pole line are the same, and are not described again.
(2) Collecting M-side line current i at k momentM(k) Calculating the current abrupt change delta i of the M side of the direct current line at the time kM(k) Calculating the differential value di of the current on the M side of the DC line at the time kM(k) Calculating
Figure BDA0002684719730000073
Calculate i∑-(t)。
(3) Computing
Figure BDA0002684719730000074
If it satisfies
Figure BDA0002684719730000075
Judging the fault in the positive direction, otherwise, judging the fault in the negative direction.
When the forward direction of the direct current transmission line protection is failed, the direction action amount is reliably larger than the direction judgment fixed value, and the protection is reliable and acts quickly. When the direct current transmission line protects the reverse direction from faults, even if disturbance exists, the direction action amount is reliably smaller than the direction judgment fixed value, and the protection is reliable and cannot be carried out mistakenly.
FIG. 2 is a view showing the forward end F protected according to the preferred embodiment of the present invention2Metallic failure schematic. As shown in fig. 2, the activation time is set to 0. As can be seen from the graph, the criterion within 2ms is satisfied, and the action is protected.
FIG. 3 is a view showing the forward end F being protected according to the preferred embodiment of the present invention 2500 omega high resistance fault schematic. As shown in fig. 3, the activation time is set to 0. As can be seen from the graph, the criterion within 2ms is satisfied, and the action is protected.
FIG. 4 is a protection reverse F according to a preferred embodiment of the present invention3Metallic failure schematic. As shown in figure 4 of the drawings,the start time is set to 0. As can be seen from the figure, the protection is reliable and does not act.
Fig. 5 is a structural diagram of a fault direction determination system of a direct current transmission line with strong anti-interference capability according to a preferred embodiment of the present invention. As shown in fig. 5, the present invention provides a system for determining a fault direction of a dc power transmission line with strong anti-interference capability, which includes:
a calculating unit 501, configured to determine a protection side of a neutral line in a dc line, and collect a line current i of the protection side at time kM(k) Calculating the abrupt change quantity delta i of the protection side current in the direct current line at the moment kM(k) Calculating the differential value di of the protection side current in the DC line at the time kM(k) Calculating the negative rate of change current i∑-(t)；
Based on the current iM(k) The current variation amount delta iM(k) And said differential value diM(k) Calculating a composite integral value of the current transient and the differential value, comprising:
Figure BDA0002684719730000081
wherein n is t0Sampling points between t and t; t is t0To protect the starting moment; t is the current calculation time; f. ofsIs the sampling frequency, mu is the difference coefficient;
based on the negative rate of change current i∑-(t) calculating a threshold value comprising:
Figure BDA0002684719730000082
wherein isetLIs a reverse time limit. Wherein the threshold value is the difference between the fixed threshold and the floating threshold.
And the judging unit is used for judging that the direct current line has positive direction fault when the composite integral value of the current break variable and the differential value is greater than the threshold value.
When in use
Figure BDA0002684719730000083
And if so, judging that the direct current line has a positive direction fault.
Preferably, the value i is defined in the inverse timesetLThe calculation method is as follows:
Figure BDA0002684719730000084
γ1is a slope coefficient, γ2As intercept coefficient, T1The window length is calculated for the inverse time limit.
Preferably, i∑-(t) the calculation method is as follows:
Figure BDA0002684719730000091
wherein T is the floating threshold calculation window length, negative slope current
Figure BDA0002684719730000092
Comprises the following steps:
Figure BDA0002684719730000093
preferably, the judging unit is further configured to: when in use
Figure BDA0002684719730000094
And if so, judging that the direct current line has a reverse fault.
The system for determining a fault direction of a direct current transmission line with strong interference rejection according to the preferred embodiment of the present invention corresponds to the method for determining a fault direction of a direct current transmission line with strong interference rejection according to another preferred embodiment of the present invention, and details thereof are not repeated herein.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims (10)

1. A method for judging the fault direction of a direct current transmission line with strong anti-jamming capability comprises the following steps:
determining a protection side of a middle pole line of a direct current line;
collecting protection side line current i in k-time direct current lineM(k)；
Calculating the abrupt change quantity delta i of the protection side current in the direct current line at the moment kM(k)，
Calculating the differential value di of the protection side current in the DC line at the time kM(k) Calculating the negative rate of change current i∑-(t)；
Based on the current iM(k) The current variation amount delta iM(k) And said differential value diM(k) Calculating a composite integral value of the current break variable and the differential value;
based on the negative rate of change current i∑-(t) calculating a threshold value;
and when the composite integral value of the current break variable and the differential value is larger than the threshold value, judging that the direct current line has a positive direction fault.
2. The method of claim 1, the inverse-time-limited value isetLThe calculation method is as follows:
Figure FDA0002684719720000011
γ1＜0，γ2＞0，γ1is a slope coefficient, γ2As intercept coefficient, T1The window length is calculated for the inverse time limit.
3. The method of claim 1, the negative rate of change current i∑-(t) the calculation method is as follows:
Figure FDA0002684719720000012
wherein T is the floating threshold calculation window length, negative slope current
Figure FDA0002684719720000013
Comprises the following steps:
Figure FDA0002684719720000014
4. the method of claim 1, further comprising: when in use
Figure FDA0002684719720000015
And if so, judging that the direct current line has a reverse fault.
5. The method of claim 1, the basing on the current iM(k) The current variation amount delta iM(k) And said differential value diM(k) Calculating a composite integral value of the current transient and the differential value, comprising:
Figure FDA0002684719720000021
wherein n is t0Sampling points between t and t; t is t0To protect the starting moment; t is the current calculation time; f. ofsIs the sampling frequency, mu is the difference coefficient;
the current i based on the negative rate of change∑-(t) calculating a threshold value comprising:
Figure FDA0002684719720000022
wherein isetLIs a reverse time limit.
6. A direct current transmission line fault direction judgment system with strong anti-jamming capability comprises:
a calculation unit for determining the protection side of the middle pole line of the DC line and collecting the line current i of the protection side at the moment kM(k) Calculating the abrupt change quantity delta i of the protection side current in the direct current line at the moment kM(k) Calculating the differential value di of the protection side current in the DC line at the time kM(k) Calculating the negative rate of change current i∑-(t)；
Based on the current iM(k) The current variation amount delta iM(k) And said differential value diM(k) Calculating a composite integral value of the current break variable and the differential value;
based on the negative rate of change current i∑-(t) calculating a threshold value;
and the judging unit is used for judging that the direct current line has positive direction fault when the composite integral value of the current break variable and the differential value is greater than the threshold value.
7. The system of claim 6, the inverse finite value isetLThe calculation method is as follows:
Figure FDA0002684719720000023
γ1＜0，γ2＞0，γ1is a slope coefficient, γ2As intercept coefficient, T1The window length is calculated for the inverse time limit.
8. The system of claim 6, said i∑-(t) the calculation method is as follows:
Figure FDA0002684719720000024
wherein T is the floating threshold calculation window length, negative slope current
Figure FDA0002684719720000031
Comprises the following steps:
Figure FDA0002684719720000032
9. the system of claim 6, the determining unit further to: when in use
Figure FDA0002684719720000033
And if so, judging that the direct current line has a reverse fault.
10. The system of claim 6, the computing unit to calculate i based on the currentM(k) The current variation amount delta iM(k) And said differential value diM(k) Calculating a composite integral value of the current transient and the differential value, comprising:
Figure FDA0002684719720000034
wherein n is t0Sampling points between t and t; t is t0To protect the starting moment; t is the current calculation time; f. ofsIs the sampling frequency, mu is the difference coefficient;
the calculation unit is used for calculating the negative change rate current i∑-(t) calculating a threshold value comprising:
Figure FDA0002684719720000035
wherein isetLIs a reverse time limit.
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