CN112485601B - Fault analysis method and system based on double-end line electrical quantity information - Google Patents
Fault analysis method and system based on double-end line electrical quantity information Download PDFInfo
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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
- G01R31/088—Aspects of digital computing
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- 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 application discloses a fault analysis method and a fault analysis system based on double-end line electrical quantity information, relates to the field of double-end line fault analysis, and solves the problem that a transition resistance is difficult to accurately calculate when a fault positioning result is lacking in a power transmission line fault process. The application provides a calculation method of transition resistance and fault distance, provides basis for knowing the cause of line fault, finding out fault points in time to quickly restore power supply and taking preventive control measures, and provides analysis basis for the accuracy of a post fault inversion and check calculation method to provide support.
Description
Technical Field
The application relates to the field of double-end transmission line fault analysis, in particular to a fault analysis method and system based on double-end line electrical quantity information.
Background
The power transmission line is basic equipment for generating power, transmitting power and the like of a power system, plays a very important role in the power system, has common ground short circuit faults, and causes great threat to the safety and stability of the system. The overhead line is mostly exposed, so that the probability of faults due to the influence of lightning stroke, forest fire, tree barriers and other factors is higher. In recent years, frequent bursts of forest fires have raised concerns about transmission line fault patterns and fault signatures. The fault distance and the transition resistance are calculated through the electrical quantity information on the two sides of the line, and the method has important significance for knowing the cause of the line fault, finding out the fault point in time, quickly recovering power supply and taking preventive control measures. In addition, the site position and the transition resistance are accurately calculated, and an analysis basis is provided for the accuracy of a post fault inversion and check calculation method.
The existing protection and fault distance measuring device can only obtain fault point information, most of the devices do not relate to accurate calculation of transition resistance, and research focuses on protection, protection action accuracy, no refusal action and no misoperation under the condition that the transition resistance exists. The method is essentially to calculate the transitional resistance value through phase voltage of each sequence voltage drop calculation fault point from the protection installation position to the fault point and zero sequence current value flowing through the transitional resistance, but the method is seriously dependent on the protection fault distance measurement result and precision, and the transitional resistance cannot be accurately calculated in a state with unknown fault distance.
Disclosure of Invention
The technical problems to be solved by the application are as follows: when an actual fault occurs, under the condition that the fault distance is not clear, the transition resistance calculation lacks an effective method, and the application provides a fault analysis system and a fault analysis method based on double-end line electrical quantity information, which solve the problems.
In order to achieve the above purpose, the technical scheme provided by the application is that the fault analysis system based on double-end line electrical quantity information comprises a data reading module, a phasor calculation module, a transition resistance calculation and fault distance measurement module and a result output and display module;
the data reading-in module is respectively connected with the phasor calculation module, the transition resistance calculation module and the fault ranging module, and the phasor calculation module is connected with the transition resistance calculation module and the fault ranging module; the transition resistance calculation and fault ranging module is connected with the result output and display module;
the data reading-in module is used for collecting three-phase current instantaneous values, three-phase voltage instantaneous values, line unit impedance, line length, capacitance current values and the like at two ends of a line, sending the current and the voltage at two ends of the line to the phasor calculation module, and sending the line impedance, the line capacitance to the ground and the line length to the transition resistance calculation and fault distance measurement module;
the phasor analysis module is used for calculating positive sequence, negative sequence and zero sequence components of the system according to current at two ends of a line and current instantaneous value recording data, expressing the positive sequence, the negative sequence and the zero sequence components, phase voltage and phase current in a phasor form, and sending the positive sequence, the negative sequence and the zero sequence components, the phase voltage and the phase current to the transition resistance calculation and fault distance measurement module;
the transition resistance calculation and fault distance measurement module is used for calculating the transition resistance and the fault distance according to the voltage and current phasor information at two ends of the line, and sending the calculation result to the result output and display module;
the result output and display module is used for displaying fault results, helping field personnel to quickly locate faults and master fault types.
The fault analysis method based on the double-end line electrical quantity information is based on the system, and comprises the following steps:
step 1: collecting information such as current, voltage, line sequence impedance, line-to-ground sequence capacitance, line length and the like at two ends of a line;
step 2: extracting phase voltage and phase current phasors, and extracting current sequence component phasors;
step 3: and calculating a transitional resistance value.
The meterThe transition resistance of the calculation line adopts the formula:wherein R is g For transition resistance +.>Wherein->Z is the ground coefficient l To represent the total impedance of line MN, Z l1 Is positive sequence impedance, Z l0 Is the zero sequence impedance of the line. />For the phase current phasor of the fault on the m-side, +.>Is the fault phase current phasor on the n-side,for the measured positive, negative and zero sequence current phasors on the m-side, +.>Are measured positive, negative and zero sequence current phasors for the n-side. />For the phase voltage phasor of the fault on the m-side, < >>Is the n-side fault phase voltage phasor.
Step 4: and calculating the fault distance.
The fault distance of the calculated line adopts the formula:
where real () is the real function, zl is the positive sequence impedance of the unit length line,
further, the system also comprises an alarm module, wherein the alarm module outputs an alarm signal, and the alarm module receives the analysis result message output by the analysis module and sends the analysis result message to the patrol personnel.
Further, a computer readable storage medium stores a computer program which, when executed by a processor, implements the steps in the method. The specific use of the method relies on a large number of calculations and therefore it is preferred that the above described calculation process is carried out by a computer program, so any computer program comprising the steps protected in the method and its storage medium are also within the scope of the application.
The application has the following advantages and beneficial effects:
the application provides a calculation method of transition resistance and fault distance, provides basis for knowing the cause of line fault, finding out fault points in time to quickly restore power supply and taking preventive control measures, and provides analysis basis for the accuracy of a post fault inversion and check calculation method to provide support.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:
FIG. 1 is a block diagram of a fault distance and transition resistance calculation system based on double-ended line electrical quantity information according to the present application
FIG. 2 is a schematic diagram of an analysis system according to the present application.
FIG. 3 is a simulation system diagram of embodiment 2
FIG. 4 is a graph showing the results of the calculation of the transition resistance in example 2
FIG. 5 is a graph showing the result of calculation of the fault distance in embodiment 2
Detailed Description
Hereinafter, the terms "comprises" or "comprising" as may be used in various embodiments of the present application indicate the presence of inventive functions, operations or elements, and are not limiting of the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the application, the terms "comprises," "comprising," and their cognate terms are intended to refer to a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be interpreted as first excluding the existence of or increasing likelihood of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the application, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B or may include both a and B.
Expressions (such as "first", "second", etc.) used in the various embodiments of the application may modify various constituent elements in the various embodiments, but the respective constituent elements may not be limited. For example, the above description does not limit the order and/or importance of the elements. The above description is only intended to distinguish one element from another element. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present application.
It should be noted that: if it is described to "connect" one component element to another component element, a first component element may be directly connected to a second component element, and a third component element may be "connected" between the first and second component elements. Conversely, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the application. As used herein, the singular is intended to include the plural as well, unless the context clearly indicates otherwise. Unless otherwise defined, all 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 various embodiments of the application belong. The terms (such as those defined in commonly used dictionaries) will be interpreted as having a meaning that is the same as the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in connection with the various embodiments of the application.
For the purpose of making apparent the objects, technical solutions and advantages of the present application, the present application will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present application and the descriptions thereof are for illustrating the present application only and are not to be construed as limiting the present application.
Example 1
The application provides a fault analysis system based on double-end circuit electric quantity information, wherein the figure 1 is a structure diagram of a fault distance and transition resistance calculation system based on double-end circuit electric quantity information, and the fault distance and transition resistance calculation system based on double-end circuit electric quantity information provided by the application comprises a data reading module, a phasor calculation module, a transition resistance calculation and fault distance measurement module and a result output and display module as shown in figure 1. The connection relation between the two modules is that the data reading module is respectively connected with the phasor calculation module, the transition resistance calculation and the fault distance measurement module, and the phasor calculation module is connected with the transition resistance calculation and the fault distance measurement module; the transition resistance calculation and fault ranging module is connected with the result output and display module.
The data reading-in module acquires three-phase current instantaneous values, three-phase voltage instantaneous values, line unit impedance, line length, capacitance current values and the like at two ends of a line, sends the current and the voltage at two ends of the line to the phasor calculation module, and sends the line impedance, the line capacitance to ground and the line length to the transition resistance calculation and fault distance measurement module;
the phasor analysis module is used for calculating positive sequence, negative sequence and zero sequence components of the system according to current at two ends of a line and current instantaneous value recording data, expressing the positive sequence, the negative sequence and the zero sequence components, phase voltage and phase current in a phasor mode, and sending the positive sequence, the negative sequence and the zero sequence components, the phase voltage and the phase current to the transition resistance calculation and fault distance measurement module;
the transition resistance calculation and fault distance measurement module is used for calculating the transition resistance and the fault distance according to the voltage and current phasor information at two ends of the line, and sending the calculation result to the result output and display module;
the result output and display module is used for displaying fault results, helping field personnel to quickly locate faults and master fault types.
The application provides a fault analysis method and a fault analysis system based on double-end line electrical quantity information, which comprise the following implementation principles related to power transmission line fault positioning and transition resistance calculation content:
1) The data reading-in module realizes the following functions:
the data reading-in module collects three-phase current instantaneous value, three-phase voltage instantaneous value, capacitance current value and other electrical quantity data at two ends of a line and line unit impedance, sequence impedance, line length and other parameter information based on a fault wave recording device or a related data recording device, sends current and voltage at two ends of the line to the phasor calculating module, and sends line impedance, line capacitance to ground and line length to the transition resistance calculating and fault distance measuring module;
2) The phasor analysis module realizes the following functions:
the data of the instantaneous value of the three-phase voltage and current transmitted by the data reading module are converted into phasor forms represented by amplitude and phase angle by utilizing a full-wave Fourier algorithm, and the three-phase current at the M side is respectively recorded as:and->The three-phase currents on the N side are respectively noted as: />And->The three-phase voltages on the M side are respectively noted as: />The three-phase voltages on the N side are respectively noted as: /> It is noted that since the full cycle algorithm requires one complete cycle of data for calculating the phasor value, the phasor data before the initial 20ms cannot be obtained.
Calculating positive sequence, negative sequence and zero sequence components of current according to the three-phase current phasors, wherein M side is:
the N side is:
for the measured positive, negative and zero sequence current phasors on the m-side, +.>Are measured positive, negative and zero sequence current phasors for the n-side.
The positive sequence, the negative sequence, the zero sequence components, the phase voltage and the phase current are sent to the transition resistance calculation and fault distance measurement module in a phasor mode;
3) The transition resistance calculation and fault ranging module realizes the following functions:
as shown in FIG. 2, a network model in a normal operation state is shown, taking line MN as an example, in the figure, Z mn Representing the equivalent impedance; y is m 、y p Representing the equivalent admittance;representing the measured current at the M end of the bus; />Representing the measured current at the N-terminal of the bus bar.
When a single-phase grounding short circuit fault occurs on the line MN, the network is required to be decomposed into a positive sequence network, a negative sequence network and a zero sequence network for calculation, and according to a sequence network diagram, the positive and negative zero sequence currents are equal when the single-phase short circuit occurs. Thus, the short circuit current at the fault point can be expressed as:
the voltage at the fault point is:
wherein: r is R g Is a transition resistance.
Let the fault phase beAt this time, the mounting place is protected +.>The phase voltages are expressed as:
m side:
n side:
definition of the definition
Wherein:z is the ground coefficient l To represent the total impedance of the faulty line, Z l1 Positive sequence impedance per unit line length, Z l0 Zero sequence impedance of the line per unit line length.
Then:
Z mf +Z nf ＝Z l
from this it can be calculated that:
the calculation formula for further solving the fault resistance is as follows:
the calculation formula for further solving the fault distance is as follows:
4) The result output and display module realizes the following functions:
and displaying the calculation results of the transition resistance calculation and fault ranging module, and sending relevant information to operation and maintenance personnel.
Accordingly, the power transmission line fault positioning and transition resistance calculating method based on the double-circuit line electric quantity information provided by the application comprises the following steps:
step 1: collecting information such as current, voltage, line sequence impedance, line-to-ground sequence capacitance, line length and the like at two ends of a line;
step 2: extracting phase voltage and phase current phasors, and extracting current sequence component phasors;
step 3: the transition resistance fault distance is calculated, and the calculation formula is as follows:
step 4: the fault distance is calculated, and the calculation formula is as follows:
example 2
The correctness and rationality of the above-described systems and methods are verified by the simulation process below. Based on PSACD/EMTDC simulation software, the scheme is subjected to simulation test by adopting a double-machine system simulation actual circuit, and a simulation model is shown in figure 3. The line length is 52km, the transition resistance value is set to 20 ohms, the positive sequence impedance of the line in unit length is z1=0.016+1i 0.301557, the zero sequence impedance of the line in unit length is z0=0.173523+1i 0.925538, and the set fault distance is 32km from the M side in the simulation process. The fault occurrence time is t=0.5 s, the fault duration is 0.2s, and the sampling frequency is 10K.
According to the method provided by the application, the transition resistance and the fault distance are analyzed, the calculation result of the transition resistance is shown in fig. 4, the calculation result is 20.12 ohms, and the deviation from the actual transition resistance value is as follows: the deviation of the result is about 0.6%, and the error is small; the calculation result of the transition resistance is shown in fig. 5.
Further, a computer readable storage medium stores a computer program which, when executed by a processor, implements the steps in the method. The specific use of the method relies on a large number of calculations and therefore it is preferred that the above described calculation process is carried out by a computer program, so any computer program comprising the steps protected in the method and its storage medium are also within the scope of the application.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the application, and is not meant to limit the scope of the application, but to limit the application to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the application are intended to be included within the scope of the application.
Claims (2)
1. The fault analysis method applied to the fault analysis system based on the double-end line electrical quantity information is characterized in that the system comprises a data reading module, a phasor calculation module, a transition resistance calculation and fault distance measurement module and a result output and display module;
the data reading-in module is respectively connected with the phasor calculation module, the transition resistance calculation module and the fault ranging module, and the phasor calculation module is connected with the transition resistance calculation module and the fault ranging module; the transition resistance calculation and fault ranging module is connected with the result output and display module;
the data reading-in module is used for collecting three-phase current instantaneous values, three-phase voltage instantaneous values, line unit impedance, line length and capacitance current values at two ends of a line, sending the currents and voltages at two ends of the line to the phasor calculation module, and sending the line impedance, the line capacitance to the ground and the line length to the transition resistance calculation and fault distance measurement module;
the phasor calculation module is used for calculating positive sequence, negative sequence and zero sequence components of the system according to current at two ends of a line and current instantaneous value recording data, expressing the positive sequence, the negative sequence and the zero sequence components, phase voltage and phase current in a phasor form, and sending the positive sequence, the negative sequence and the zero sequence components, the phase voltage and the phase current to the transition resistance calculation and fault distance measurement module;
the transition resistance calculation and fault distance measurement module is used for calculating the transition resistance and the fault distance according to the voltage and current phasor information at two ends of the line, and sending the calculation result to the result output and display module;
the result output and display module is used for displaying fault results, helping field personnel to quickly locate faults and master fault types and causes;
the fault distance and transition resistance calculation method comprises the following steps:
step 1: collecting current, voltage, line sequence impedance, line-to-ground sequence capacitance and line length information at two ends of a line;
step 2: extracting phase voltage and phase current phasors, and extracting current sequence component phasors;
step 3: calculating a fault distance and a transition resistance value;
step 4: the calculation result is sent to an alarm module for display, the alarm module outputs an alarm signal, and the alarm module receives an analysis result message output by the analysis module and sends the analysis result message to a patrol personnel;
the calculation of the transition resistance value adopts the formula:
in the formula, real () is a real part taking function, R g In order to provide a transition resistance,for the measured positive, negative and zero sequence current phasors on the m-side, +.>For the measured positive, negative and zero sequence current phasors on the n-side, Z l To represent the total impedance of the faulty line;
and:
wherein:z is the ground coefficient lf1 Positive sequence impedance per unit line length, Z lf0 Zero sequence impedance of line per unit line length, < >>For the phase current phasor of the fault on the m-side, +.>Is the phase current phasor of the fault on the n-side, < >>For the phase voltage phasor of the fault on the m-side, < >>Is the n-side fault phase voltage phasor.
2. The fault analysis method according to claim 1, wherein the calculation of the fault distance uses the formula:
where real () is a real function, zl is the positive sequence impedance per unit length of the faulty line,for the phase voltage phasor of the fault on the m-side, < >>As the phase voltage phasor of the fault on the n side, Z l To represent the total impedance of the faulty line, +.>And->The method comprises the following steps of:
wherein:for the phase current phasor of the fault on the m-side, +.>Is the phase current phasor of the fault on the n-side, < >>Is the grounding coefficient, wherein Z lf1 Positive sequence impedance per unit line length, Z lf0 Zero sequence impedance of the line per unit line length.
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