CN112327099A - Power distribution network earth fault line selection tripping method and device and storage medium - Google Patents
Power distribution network earth fault line selection tripping method and device and storage medium 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
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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Abstract
The invention discloses a method, a device and a storage medium for line selection and tripping of a power distribution network ground fault, wherein the method comprises the following steps: acquiring the working state of the power distribution network; when the working state is normal operation, the arc suppression coil is grounded to be used as a flexible grounding device; when the working state is a ground fault, current compensation is carried out by adopting an arc suppression coil, and the fault type of the ground fault is identified; when the fault type is intermittent earth fault, adopting a transient method to select lines and putting the lines into a tripping circuit; when the fault type is a stable grounding fault, current compensation lasting for a first compensation time is carried out by adopting a flexible grounding device; after the first compensation time is reached and the working state is normal operation, the compensation state is exited; and after the first compensation time is reached and the working state is the grounding fault, putting the small resistor into the flexible grounding device, performing fault line selection and putting the small resistor into a tripping circuit according to a line selection result. The invention can select the line according to the fault type, and improve the success rate of fault isolation of the power distribution network.
Description
Technical Field
The invention relates to the technical field of intelligent power grid fault protection, in particular to a method and a device for line selection and tripping of a power distribution network ground fault and a storage medium.
Background
During operation of the power distribution network, various fault types can be encountered, wherein partial faults are permanent ground faults, partial faults are transient faults, and the span range of fault point transition resistance in various ground faults is large.
In order to handle various complex grounding faults, southern power grid companies have promoted a flexible grounding mode, namely, the application of a mode of grounding an arc suppression coil in parallel with a small resistor. However, the grounding method has the same defect as the grounding of the small resistor, namely, when the small resistor is put into use, the fault isolation can be performed only by means of zero-sequence overcurrent protection, the transition resistance tolerance capability of the grounding method is low (about 100 ohms), the grounding method cannot adapt to various complex fault types of a power distribution network, and certain potential safety hazards are brought to the operation of the power grid.
Disclosure of Invention
The embodiment of the invention provides a line selection tripping method for a power distribution network ground fault, which can select lines according to fault types and improve the success rate of power distribution network fault isolation.
The embodiment of the invention provides a method for selecting and tripping a power distribution network ground fault line, which comprises the following steps:
acquiring the working state of the power distribution network;
when the working state is normal operation, grounding the arc suppression coil as a flexible grounding device;
when the working state is a ground fault, current compensation is carried out by adopting the arc suppression coil, and the fault type of the ground fault is identified;
when the fault type is intermittent earth fault, adopting a transient method to select lines and putting the lines into a tripping circuit;
when the fault type is a stable grounding fault, the flexible grounding device is adopted to perform current compensation lasting for a first compensation time;
after the first compensation time is reached and the working state is normal operation, the flexible grounding device is quitted from the compensation state;
and after the first compensation time is reached and the working state is the grounding fault, putting a small resistor into the flexible grounding device, performing fault line selection and putting the small resistor into a tripping circuit according to a line selection result.
As an improvement of the above scheme, the method further comprises the following steps: the fault type is identified by wavelet analysis.
As an improvement of the above solution, the identifying the fault type through wavelet analysis includes:
let fsFor signal sampling frequency, fs＝10kHz；
Selecting a db5 wavelet, and performing 5-layer decomposition on the zero-sequence voltage signal to obtain high-frequency components D1, D2, D3, D4, D5 and a low-frequency component A5; wherein, A5 comprises 0-156.25 Hz, D5 comprises 156.25-312.5 Hz, D4 comprises 312.5-625 Hz, D3 comprises 625-1250 Hz, D2 comprises 1250-2500 Hz, and D1 comprises 2500-5000 Hz;
and in a preset time period, if the occurrence frequency of a certain high-frequency band signal exceeds a limit value, determining that the fault type is an intermittent ground fault, otherwise, determining that the fault type is a stable ground fault.
As an improvement of the above scheme, the performing fault line selection and putting into a trip circuit according to a line selection result includes: and (4) selecting lines by a transient method.
As an improvement of the above scheme, the line selection by the transient method includes:
determining a fault time point and a characteristic frequency band;
and selecting the line according to the magnitude relation of the signal amplitude in the characteristic frequency band, wherein the line with the maximum amplitude is taken as a fault line.
As an improvement of the above scheme, the performing fault line selection and putting into a trip circuit according to a line selection result includes:
and selecting the line according to the ratio of zero sequence admittance of the line after the small resistor is put into the line and before the small resistor is put into the line.
As an improvement of the above solution, the selecting line by a ratio of zero sequence admittances of the line after the small resistor is applied and before the small resistor is applied includes:
let U0.bBefore the switching switch is closed, the zero sequence voltage of a bus, U0.aFor the zero sequence voltage of the bus after the switching switch is closed, I0.kbZero sequence current of the k-th circuit before switching on/off of the switch0.kaZero-sequence current of the kth return line after the switching switch is closed; the zero sequence admittance of the k-th circuit before the switching switch is closed is Y0.kb＝I0.kb/U0.kbAnd the zero sequence admittance of the k-th circuit after closing is Y0.ka＝I0.ka/U0.ka；
If the circuit switching switch is closed, the admittance ratio R is larger than the threshold value>6, judging as a fault line; wherein R ═ Y0.ka/Y0.kb。
As an improvement of the above solution, when the small resistor is put into the flexible grounding device, the flexible grounding device comprises: and closing the switching switch of the small resistor, and switching to a state that the arc suppression coil is connected with the small resistor in parallel and is grounded.
Correspondingly, an embodiment of the present invention provides a power distribution network ground fault line selection tripping device, which includes: the system comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to realize the distribution network ground fault line selection tripping method according to the first embodiment of the invention.
The third embodiment of the present invention correspondingly provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, a device in which the computer-readable storage medium is located is controlled to execute the method for selecting and tripping a ground fault of a power distribution network according to the first embodiment of the present invention.
Compared with the prior art, the method for selecting the line and tripping the power distribution network ground fault provided by the embodiment of the invention has the following beneficial effects:
when the power distribution network normally operates, once a single-phase earth fault occurs in the system, firstly, arc suppression coils are used for compensation, fault types are continuously identified during compensation, and if the fault is an intermittent earth fault, as a transient method line selection program is good at processing, a transient method is used for line selection for multiple times to ensure accuracy and a tripping circuit is used; if the fault is a stable grounding fault, the delta T duration is continuously compensated, and then if the fault disappears, the arc suppression coil exits from a compensation state; the information of each stage of the flexible grounding device in the whole process of single-phase grounding fault processing is utilized, different line selection algorithms are adopted in different categories to process the fault, and therefore the purpose of improving the success rate of fault isolation is achieved.
Drawings
Fig. 1 is a schematic flowchart of a method for selecting and tripping a ground fault of a power distribution network according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of wavelet multi-resolution analysis results of three single-phase ground faults according to an embodiment of the present invention.
Fig. 3 is a flowchart illustrating an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, it is a schematic flow chart of a method for selecting and tripping a ground fault of a power distribution network according to an embodiment of the present invention, including:
s101, acquiring the working state of the power distribution network;
s102, when the working state is normal operation, grounding the arc suppression coil to serve as a flexible grounding device;
s103, when the working state is the ground fault, current compensation is carried out by adopting an arc suppression coil, and the fault type of the ground fault is identified;
s104, when the fault type is intermittent earth fault, adopting a transient method to select lines and putting the lines into a trip circuit;
s105, when the fault type is a stable grounding fault, current compensation lasting for first compensation time delta T is carried out by adopting a flexible grounding device;
further, the fault type is identified by wavelet analysis.
Further, identifying the fault type through wavelet analysis comprises:
let fsFor signal sampling frequency, fs＝10kHz；
Selecting a db5 wavelet, and performing 5-layer decomposition on the zero-sequence voltage signal to obtain high-frequency components D1, D2, D3, D4, D5 and a low-frequency component A5; wherein, A5 comprises 0-156.25 Hz, D5 comprises 156.25-312.5 Hz, D4 comprises 312.5-625 Hz, D3 comprises 625-1250 Hz, D2 comprises 1250-2500 Hz, and D1 comprises 2500-5000 Hz;
specifically, referring to fig. 2, a schematic diagram of a result of wavelet multi-resolution analysis of three single-phase ground faults according to an embodiment of the present invention is shown. And in a preset time period, if the occurrence frequency of a certain high-frequency band signal exceeds a limit value, determining that the fault type is an intermittent ground fault, and otherwise, determining that the fault type is a stable ground fault.
S106, after the first compensation time delta T is reached and the working state is normal operation, the flexible grounding device is quitted from the compensation state;
and S107, after the first compensation time delta T is reached and the working state is a grounding fault, putting a small resistor into the flexible grounding device, performing fault line selection and putting the small resistor into a tripping circuit according to a line selection result.
Further, when the fault type is intermittent earth fault, fault line selection is carried out and a trip circuit is put into according to a line selection result, and the method comprises the following steps: and (4) selecting lines by a transient method.
Further, line selection is performed through a transient method, and the method comprises the following steps:
determining a fault time point and a characteristic frequency band;
and selecting the line according to the magnitude relation of the signal amplitude in the characteristic frequency band, wherein the line with the maximum amplitude is taken as a fault line.
Specifically, the transient method line selection procedure is also called feature band method line selection. Due to the compensation effect of the arc suppression coil on the capacitive current in the loop, the line selection method adopting the power frequency current amplitude/phase comparison method is invalid. Therefore, a method of selecting a line using a transient signal of sampling data near a point of occurrence of a fault is called a characteristic band method. The key points of the method are to determine a fault moment point and to determine a characteristic frequency band. And selecting the line by using the magnitude relation of signal amplitudes in the characteristic frequency band, wherein the line with the largest amplitude is a fault line. Because the used signal frequency band is concentrated in a high-frequency band, the method has better effect on fault line selection of transient signals. Because the intermittent earth fault has earth fault for many times in a short time, the transient characteristic is obvious, and the line selection results of many times are checked mutually (n can be set), the line selection principle of the transient method is particularly suitable for the intermittent earth fault.
Further, fault line selection is carried out and a trip circuit is put into according to a line selection result, and the method comprises the following steps:
and selecting the line according to the ratio of zero sequence admittance of the line after the small resistor is put into the line and before the small resistor is put into the line.
Further, the line selection is carried out through the ratio of zero sequence admittance of the line after the small resistor is put into the line and before the small resistor is put into the line, and the line selection comprises the following steps:
let U0.bBefore the switching switch is closed, the zero sequence voltage of a bus, U0.aFor the zero sequence voltage of the bus after the switching switch is closed, I0.kbZero sequence current of the k-th circuit before switching on/off of the switch0.kaZero-sequence current of the kth return line after the switching switch is closed; the zero sequence admittance of the k-th circuit before the switching switch is closed is Y0.kb＝I0.kb/U0.kbAnd the zero sequence admittance of the k-th circuit after closing is Y0.ka＝I0.ka/U0.ka；
If the circuit switch is closed, the admittance ratio R is increased>6, judging as a fault line; wherein R ═ Y0.ka/Y0.kb。
Further, when a small resistance is put into the flexible grounding device, it comprises: and closing the fling-cut switch of the small resistor, and switching to a state that the arc suppression coil is connected with the small resistor in parallel and is grounded.
In a specific embodiment, referring to fig. 3, a flowchart of a specific embodiment provided in the first embodiment of the present invention is shown. When the device operates normally, the flexible grounding device is grounded for the arc suppression coil, and the arc suppression coil is far away from a resonance point. Once a single-phase earth fault occurs in the system, the arc suppression coil quickly enters a resonance point and compensates the capacitive current;
during the compensation period of the arc suppression coil, the system carries out frequency spectrum decomposition on the zero sequence voltage by monitoring the waveform of the zero sequence voltage and utilizing a wavelet analysis method and identifies the type of the ground fault, and if the zero sequence voltage is the intermittent ground fault, a transient method is called to carry out fault line selection due to the fact that a transient method line selection program is good at processing. Because the intermittent fault breaks down for multiple times in a short time, the line selection can be conveniently carried out for multiple times so as to ensure the accuracy and put into a trip circuit;
if the fault is a stable ground fault, the arc suppression coil continuously compensates for the time length of delta T, and the time length of delta T is generally 3-10 s.
After the compensation delta T duration is continued, if the fault disappears, the arc suppression coil exits the compensation state.
After the time length of the delta T is continuously compensated, if the fault still exists, a small-resistor switching switch of the flexible grounding device is closed, a small resistor is put into the flexible grounding device, the system carries out line selection by utilizing the ratio of zero sequence admittance of a line after the small resistor is put into the flexible grounding device and before the small resistor is put into the flexible grounding device, and the system is put into a trip circuit according to the line selection result.
Compared with the prior art, the method and the device for the line selection and the trip of the ground fault of the power distribution network have the following beneficial effects that:
when the power distribution network normally operates, once a single-phase earth fault occurs in the system, firstly, arc suppression coils are used for compensation, fault types are continuously identified during compensation, and if the fault is an intermittent earth fault, as a transient method line selection program is good at processing, a transient method is used for line selection for multiple times to ensure accuracy and a tripping circuit is used; if the fault is a stable grounding fault, the delta T duration is continuously compensated, and then if the fault disappears, the arc suppression coil exits from a compensation state; the information of each stage of the flexible grounding device in the whole process of single-phase grounding fault processing is utilized, different line selection algorithms are adopted in different categories to process the fault, and therefore the purpose of improving the success rate of fault isolation is achieved.
Correspondingly, the embodiment of the invention provides a distribution network ground fault line selection tripping device, which comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to realize the distribution network ground fault line selection tripping method according to the first embodiment of the invention. The distribution network ground fault line selection tripping device can be a desktop computer, a notebook computer, a palm computer, a cloud server and other computing equipment. The distribution network ground fault line selection tripping device can comprise, but is not limited to, a processor and a memory.
The third embodiment of the present invention correspondingly provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, a device in which the computer-readable storage medium is located is controlled to execute the method for selecting and tripping a ground fault of a power distribution network according to the first embodiment of the present invention.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being the control center of the distribution network ground fault line selection tripping device, and various interfaces and lines are utilized to connect the various parts of the entire distribution network ground fault line selection tripping device.
The memory can be used for storing the computer program and/or the module, and the processor can realize various functions of the power distribution network ground fault line selection tripping device by operating or executing the computer program and/or the module stored in the memory and calling the data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the module/unit integrated with the distribution network ground fault line selection tripping device can be stored in a computer readable storage medium if the module/unit is realized in the form of a software functional unit and sold or used as an independent product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for tripping a ground fault line selection of a power distribution network is characterized by comprising the following steps:
acquiring the working state of the power distribution network;
when the working state is normal operation, grounding the arc suppression coil as a flexible grounding device;
when the working state is a ground fault, current compensation is carried out by adopting the arc suppression coil, and the fault type of the ground fault is identified;
when the fault type is intermittent earth fault, adopting a transient method to select lines and putting the lines into a tripping circuit;
when the fault type is a stable grounding fault, the flexible grounding device is adopted to perform current compensation lasting for a first compensation time;
after the first compensation time is reached and the working state is normal operation, the flexible grounding device is quitted from the compensation state;
and after the first compensation time is reached and the working state is the grounding fault, putting a small resistor into the flexible grounding device, performing fault line selection and putting the small resistor into a tripping circuit according to a line selection result.
2. The method for tripping a power distribution network during ground fault line selection according to claim 1, further comprising: the fault type is identified by wavelet analysis.
3. The method for tripping a power distribution network during ground fault line selection according to claim 2, wherein said identifying said fault type by wavelet analysis comprises:
let fsFor signal sampling frequency, fs＝10kHz；
Selecting a db5 wavelet, and performing 5-layer decomposition on the zero-sequence voltage signal to obtain high-frequency components D1, D2, D3, D4, D5 and a low-frequency component A5; wherein, A5 comprises 0-156.25 Hz, D5 comprises 156.25-312.5 Hz, D4 comprises 312.5-625 Hz, D3 comprises 625-1250 Hz, D2 comprises 1250-2500 Hz, and D1 comprises 2500-5000 Hz;
and in a preset time period, if the occurrence frequency of a certain high-frequency band signal exceeds a limit value, determining that the fault type is an intermittent ground fault, otherwise, determining that the fault type is a stable ground fault.
4. The method for tripping a ground fault line selection of a power distribution network according to claim 1, wherein said performing fault line selection and putting into a trip circuit according to the result of line selection comprises: and (4) selecting lines by a transient method.
5. The method for tripping the ground fault line selection of the power distribution network according to claim 4, wherein the line selection is performed by a transient method, and comprises the following steps:
determining a fault time point and a characteristic frequency band;
and selecting the line according to the magnitude relation of the signal amplitude in the characteristic frequency band, wherein the line with the maximum amplitude is taken as a fault line.
6. The method for tripping a ground fault line selection of a power distribution network according to claim 1, wherein said performing fault line selection and putting into a trip circuit according to the result of line selection comprises:
and selecting the line according to the ratio of zero sequence admittance of the line after the small resistor is put into the line and before the small resistor is put into the line.
7. The method for tripping a ground fault line selection of a power distribution network according to claim 6, wherein said selecting by a ratio of zero sequence admittance of the line after said small resistor is applied and before said small resistor is applied comprises:
let U0.bBefore the switching switch is closed, the zero sequence voltage of a bus, U0.aFor the zero sequence voltage of the bus after the switching switch is closed, I0.kbZero sequence current of the k-th circuit before switching on/off of the switch0.kaZero-sequence current of the kth return line after the switching switch is closed; the zero sequence admittance of the k-th circuit before the switching switch is closed is Y0.kb＝I0.kb/U0.kbAnd the zero sequence admittance of the k-th circuit after closing is Y0.ka＝I0.ka/U0.ka；
If the circuit switching switch is closed, the admittance ratio R is larger than the threshold value>6, judging as a fault line; wherein R ═ Y0.ka/Y0.kb。
8. The method for tripping a power distribution network during ground fault line selection according to claim 1, wherein when said small resistor is put into said flexible grounding means, comprising: and closing the switching switch of the small resistor, and switching to a state that the arc suppression coil is connected with the small resistor in parallel and is grounded.
9. A power distribution network ground fault line selection trip apparatus comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor when executing the computer program implementing the power distribution network ground fault line selection trip method of any of claims 1 to 8.
10. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus on which the computer-readable storage medium is located to perform the method according to any one of claims 1 to 8.
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