CN113917282A - Distribution network fault rapid positioning system based on short-circuit current - Google Patents
Distribution network fault rapid positioning system based on short-circuit current Download PDFInfo
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- 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
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- 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
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Abstract
The invention discloses a distribution network fault rapid positioning system based on short-circuit current, which comprises: the fault recorder is used for collecting outlet information of the substation and short-circuit current of a CT collecting end, the wireless terminal and the monitoring platform are used; the fault platform comprises an information acquisition unit, an information operation unit, a basic database unit and a result display unit, wherein the information acquisition unit is used for acquiring fault signals of the fault recorder; the information operation unit stores a fault positioning model for resolving fault points; the basic database unit comprises a system impedance database, a cable parameter database and an overhead line parameter database; and the result display unit is used for displaying the position area of the fault point on the virtual distribution line. The scheme determines the section where the fault occurs in a short time, and effectively changes the backward situation of manually and blindly searching the fault, thereby greatly improving the fault processing efficiency and effectively improving the power supply reliability.
Description
Technical Field
The invention relates to the technical field of distribution network fault positioning, in particular to a distribution network fault rapid positioning system based on short-circuit current.
Background
At present, the load of a 10kV line is continuously increased, the structure of the line is more and more complex, and various line faults also frequently occur. The time for searching for the fault in the fault processing process after the fault occurs accounts for a very large proportion of the whole fault handling, and the proportion is about 70-90% according to statistics, so that the power supply reliability of the line is difficult to improve. The current fault handling method is to discriminate the power failure area according to the line fault indicator and the wireless communication technology, and the power supply service system commands the first-aid repair personnel to search the fault through the power failure area, so that the method improves the fault searching time to a certain extent, but is limited by the number of the fault indicators and the communication reliability, and has a plurality of defects in practical use: firstly, the power failure range is large, and the fault positioning range is also large; secondly, the main line fault is difficult to effectively distinguish, the main line fault causes the whole line fault, and the search range is the whole line; thirdly, instantaneous faults caused by lightning natural factors and the like are difficult to distinguish, power supply is not influenced after a plurality of lines are successfully superposed after faults, and in fact, line equipment still has defects which are difficult to find, and the defects of different degrees are left, so that potential safety hazards exist.
Disclosure of Invention
The invention aims to solve the defect that the traditional fault positioning technology and method cannot accurately and efficiently position line faults, and provides a distribution network fault rapid positioning system based on short-circuit current.
In order to achieve the technical purpose, the invention provides a distribution network fault rapid positioning system based on short-circuit current, which comprises: the fault recorder is used for collecting outlet information of a substation and short-circuit current of a CT collecting end, the wireless terminal and the monitoring platform are used, and the fault recorder sends fault information to the monitoring platform through the wireless terminal for fault positioning;
the fault platform comprises an information acquisition unit, an information operation unit, a basic database unit and a result display unit, wherein the information acquisition unit is used for acquiring fault signals of the fault recorder and eliminating interference signals;
the information operation unit stores a fault positioning model for resolving fault points, and automatically calculates the range of corresponding short-circuit fault points according to the numerical value of the short-circuit current;
the basic database unit comprises a system impedance database, a cable parameter database and an overhead line parameter database; obtaining system impedance, cable parameters and overhead line parameters according to historical fault data, and training a fault positioning model to obtain a relation with short-circuit current;
and the result display unit is used for displaying the position area of the fault point on the virtual distribution line.
In the scheme, system impedance, cable parameters and overhead line parameters of all distribution network lines are calculated and processed, and an impedance database, a cable parameter database and an overhead line parameter database are established; establishing a fault positioning model for resolving fault points, acquiring the numerical value of the short-circuit current of a fault recorder by inquiring and calling parameter data in a database, and automatically calculating the corresponding short-circuit distance and short-circuit range; the method combines the operation mode and the load flow of the power grid of the level where the line is located, and utilizes the self-adaptive control rule to self-adaptively adjust the search range of the impedance value, so as to strive to position the fault range smaller and more accurately.
Preferably, the establishing of the system impedance database includes the following steps:
calculating an impedance value according to an equivalent impedance table of a power grid system, and equipment parameters and line parameters of the system;
the corresponding system operation mode of the minimum impedance value is as follows:
the maximum operation mode of the 220kV system is that all plant units connected to the system of the power grid are fully opened, all main transformers of thermal power and hydropower are put into operation, and the system is operated and accessed according to a normal mode or a change mode appearing in a regulation;
the corresponding system operation mode of the maximum impedance value is as follows: the minimum operation mode of the 220kV system is that all small hydropower stations and thermal power plant units of the power grid are completely stopped, and one station with large capacity in the power substation is stopped, a certain line is powered off, or a bus tie switch is stopped for service maintenance.
Preferably, all cable parameter information between the outgoing line of each substation in the power distribution system and the No. 1 pole is recorded in the cable parameter database, the cable parameter information comprises the maximum allowable current-carrying capacity of the cable, the length of the cable, the cross-sectional area of the core and the material characteristics of the cable, and the impedance value of the cable is calculated according to the length of the cable, the cross-sectional area of the core and the material characteristics of the cable, wherein the maximum allowable current-carrying capacity is used as a reference dimension for safe operation of the power distribution system.
Preferably, the load distribution is performed by the overhead wire system after the pole number 1, and the unit impedance value of the overhead wire is calculated from the material, length, cross-sectional area, and temperature value of each stage of the overhead wire and recorded in the overhead wire parameter database.
Preferably, the impedance of the power distribution system is influenced by the power supply boosting and drawing, the impedance of the power distribution system can only determine a maximum value range and a minimum value range, the impedance value of the system is between the maximum value and the minimum value, when the unit is started and changed, the impedance of the system and the load show a certain trend, and the one-to-one corresponding relation between the load data range and the system impedance data range is established by obtaining the coupling relation between the load and the operation mode for a long time, so that the calculated value of the impedance of the system is corrected and self-adaptively adjusted; dividing the whole network load into four demand time periods according to the load demand: 17:00-08:00, 08:00-11:00, 11:00-13:00, 13:00-17:00, four load demand periods correspond to four operation modes of the power distribution system, wherein the operation modes of the valley period corresponding to 17:00-08:00 are as follows: the system unit runs less, and the system impedance value above 220kV is larger; the operation mode of the flat valley time period corresponding to 11:00-13:00 is in a midstream state of the operation place of the system unit above 220 kV; a median time interval corresponding to 08:00-11:00 and an intermediate state of a system unit running position above 220 kV; the unit runs more in the peak time period corresponding to 13:00-17:00 and the system load time period of more than 220kV, and the system impedance of more than 220kV is smaller.
In the scheme, the system selects system impedance under four different operation modes according to the operation mode, and the system impedance is different in different modes; meanwhile, the system impedance is further optimized according to the load condition of the whole network, wherein the operation of the unit is less in the valley period, and the system impedance is larger; the number of units is large during peak hours, and the system impedance is small; therefore, the system impedance value can be automatically adjusted by combining the current operation mode and the load time period, and the system impedance can be accurately calculated.
Preferably, the impedance values of the lines called from the databases of the basic database unit are per unit values of parameters corresponding to the positive sequence and the zero sequence impedance, the reference capacity is 100 mega volt-ampere, the reference voltage is an average voltage, and a fault location model established according to the relay protection principle has the following formula:
wherein, KdIs the short circuit coefficient; i isd-reference short circuit current; i isdIs the actual short circuit current; N-CT transformation ratio; alpha is a corresponding operation mode; beta-full network load period; xs *-a system impedance value; xdl *-a cable impedance value; z*-overhead line unit impedance value; l-distance of fault point to pole number 1.
The model calculation is carried out according to a per unit value method, and the per unit value conversion of each variable has the following formula, wherein the reference capacity Sd＝100MVA；
The voltage calculated by short-circuiting the reference voltage taking element at the reference voltage, i.e.
Ud＝Uc＝1.05UN
The reference current is:
the reference reactance is:
the invention has the beneficial effects that: according to the distribution network fault rapid positioning system based on the short-circuit current, outlet information acquired by a fault recorder protection device installed in a substation after a fault and the short-circuit current acquired by CT are transmitted to a scheduling background in a signal mode and automatically input to the distribution network fault rapid positioning system, and a fault occurring section is determined in a short time by combining related parameters such as 10kV line system impedance, cable parameters and overhead line parameters, so that the backward situation of manually and blindly searching for the fault is effectively changed, the fault processing efficiency is greatly improved, and the power supply reliability can be effectively improved; selecting system impedance under four different operation modes according to different operation modes, wherein the system impedance is different in different modes; meanwhile, the system impedance is further optimized according to the load condition of the whole network, wherein the operation of the unit is less in the valley period, and the system impedance is larger; the number of units is large during peak hours, and the system impedance is small; therefore, the impedance value of the system can be automatically adjusted by combining the current operation mode and the load time period, and the calculation precision of the impedance value is further improved, so that the positioning precision of the fault point is improved.
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Fig. 1 is a schematic structural diagram of a distribution network fault rapid positioning system based on short-circuit current.
The notation in the figure is: 1-fault recorder, 2-wireless terminal, 3-monitoring platform, 31-information acquisition unit, 32-information operation unit, 33-basic database unit, 34-result display unit, 331-system impedance database, 332-cable parameter database 332, 333-overhead line parameter database.
Detailed Description
For the purpose of better understanding the objects, technical solutions and advantages of the present invention, the following detailed description of the present invention with reference to the accompanying drawings and examples should be understood that the specific embodiment described herein is only a preferred embodiment of the present invention, and is only used for explaining the present invention, and not for limiting the scope of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without making creative efforts shall fall within the scope of the present invention.
Example (b): as shown in fig. 1, a schematic structural diagram of a distribution network fault rapid positioning system based on short-circuit current is composed of a fault recorder 1 for collecting substation outlet information and CT collection end short-circuit current, a wireless terminal 2 and a monitoring platform 3, wherein the fault recorder sends fault information to the monitoring platform through the wireless terminal for fault positioning;
the fault platform comprises an information acquisition unit 31, an information operation unit 32, a basic database unit 33 and a result display unit 34, wherein the information acquisition unit is used for acquiring fault signals of a fault recorder and eliminating interference signals;
the information operation unit stores a fault positioning model for resolving fault points, and automatically calculates the range of corresponding short-circuit fault points according to the numerical value of the short-circuit current;
the basic database unit comprises a system impedance database 331, a cable parameter database 332 and an overhead line parameter database 333; obtaining system impedance, cable parameters and overhead line parameters according to historical fault data, and training a fault positioning model to obtain a relation with short-circuit current;
and the result display unit is used for displaying the position area of the fault point on the virtual distribution line.
In the embodiment, system impedance, cable parameters and overhead line parameters of all distribution network lines are calculated and processed, and an impedance database, a cable parameter database and an overhead line parameter database are established; establishing a fault positioning model for resolving fault points, acquiring the numerical value of the short-circuit current of a fault recorder by inquiring and calling parameter data in a database, and automatically calculating the corresponding short-circuit distance and short-circuit range; the method combines the operation mode and the load flow of the power grid of the level where the line is located, and utilizes the self-adaptive control rule to self-adaptively adjust the search range of the impedance value, so as to strive to position the fault range smaller and more accurately.
The establishment of the system impedance database comprises the following steps:
calculating an impedance value according to an equivalent impedance table of a power grid system, and equipment parameters and line parameters of the system;
the corresponding system operation mode of the minimum impedance value is as follows:
the maximum operation mode of the 220kV system is that all plant units connected to the system of the power grid are fully opened, all main transformers of thermal power and hydropower are put into operation, and the system is operated and accessed according to a normal mode or a change mode appearing in a regulation;
the corresponding system operation mode of the maximum impedance value is as follows: the minimum operation mode of the 220kV system is that all small hydropower stations and thermal power plant units of the power grid are completely stopped, and one station with large capacity in the power substation is stopped, a certain line is powered off, or a bus tie switch is stopped for service maintenance.
All cable parameter information between outgoing lines of all substations in the power distribution system and the No. 1 pole is recorded in the cable parameter database, the cable parameter information comprises the maximum allowable current-carrying capacity of the cable, the length of the cable, the cross-sectional area of a wire core and the material characteristics of the cable, the impedance value of the cable is calculated according to the length of the cable, the cross-sectional area of the wire core and the material characteristics of the cable, and the maximum allowable current-carrying capacity is used as the reference dimension of safe operation of the power distribution system.
And the No. 1 pole carries out load distribution in an overhead line mode, calculates the unit impedance value of the overhead line according to the material, the length, the cross section area and the temperature value of each level of overhead line and records the unit impedance value in an overhead line parameter database.
The impedance of the power distribution system is influenced by the power supply boosting and drawing, the impedance of the power distribution system can only determine a maximum value range and a minimum value range, the impedance value of the system is between the maximum value and the minimum value, when the unit is started and changed, the impedance of the system and the load show a certain trend, and the one-to-one corresponding relation between the load data range and the system impedance data range is established by obtaining the coupling relation between the load and the operation mode for a long time, so that the calculated value of the impedance of the system is corrected and self-adaptively adjusted; dividing the whole network load into four demand time periods according to the load demand: 17:00-08:00, 08:00-11:00, 11:00-13:00, 13:00-17:00, four load demand periods correspond to four operation modes of the power distribution system, wherein the operation modes of the valley period corresponding to 17:00-08:00 are as follows: the system unit runs less, and the system impedance value above 220kV is larger; the operation mode of the flat valley time period corresponding to 11:00-13:00 is in a midstream state of the operation place of the system unit above 220 kV; a median time interval corresponding to 08:00-11:00 and an intermediate state of a system unit running position above 220 kV; the unit runs more in the peak time period corresponding to 13:00-17:00 and the system load time period of more than 220kV, and the system impedance of more than 220kV is smaller; the system selects system impedance under four different operation modes according to the operation mode, and the system impedance is different in different modes; meanwhile, the system impedance is further optimized according to the load condition of the whole network, wherein the operation of the unit is less in the valley period, and the system impedance is larger; the number of units is large during peak hours, and the system impedance is small; therefore, the system impedance value can be automatically adjusted by combining the current operation mode and the load time period, and the system impedance can be accurately calculated.
The method comprises the following steps of calling impedance values of each line from each database of a basic database unit, wherein the impedance values are per-unit values of parameters corresponding to positive sequence impedance and zero sequence impedance, measuring 100 megavolt-ampere by using reference capacity, averaging voltage by using reference voltage, and establishing a fault positioning model according to a relay protection principle, wherein the formula is as follows:
wherein, KdIs the short circuit coefficient; i isd-reference short circuit current; i isdIs the actual short circuit current; N-CT transformation ratio; alpha is a corresponding operation mode; beta-full network load period; xs *-a system impedance value; xdl *-a cable impedance value; z*-overhead line unit impedance value; l-distance of fault point to pole number 1.
The model calculation is carried out according to a per unit value method, and the per unit value conversion of each variable has the following formula, wherein the reference capacity Sd＝100MVA；
The voltage calculated by short-circuiting the reference voltage taking element at the reference voltage, i.e.
Ud＝Uc＝1.05UN
The reference current is:
the reference reactance is:
the above-mentioned embodiments are preferred embodiments of the distribution network fault fast positioning system based on short-circuit current, and the scope of the present invention is not limited thereto, and the scope of the present invention includes and is not limited to the embodiments, and all equivalent changes made according to the shape and structure of the present invention are within the protection scope of the present invention.
Claims (6)
1. The utility model provides a join in marriage net fault quick positioning system based on short-circuit current which characterized in that, including: the fault recorder is used for collecting outlet information of a substation and short-circuit current of a CT collecting end, the wireless terminal and the monitoring platform are used, and the fault recorder sends fault information to the monitoring platform through the wireless terminal for fault positioning;
the fault platform comprises an information acquisition unit, an information operation unit, a basic database unit and a result display unit, wherein the information acquisition unit is used for acquiring fault signals of the fault recorder and eliminating interference signals;
the information operation unit stores a fault positioning model for resolving fault points, and automatically calculates the range of corresponding short-circuit fault points according to the numerical value of the short-circuit current;
the basic database unit comprises a system impedance database, a cable parameter database and an overhead line parameter database; obtaining system impedance, cable parameters and overhead line parameters according to historical fault data, and training a fault positioning model to obtain a relation with short-circuit current;
and the result display unit is used for displaying the position area of the fault point on the virtual distribution line.
2. The system of claim 1, wherein the system comprises a power distribution network fault location module,
the establishment of the system impedance database comprises the following steps:
calculating an impedance value according to an equivalent impedance table of a power grid system, and equipment parameters and line parameters of the system;
the corresponding system operation mode of the minimum impedance value is as follows:
the maximum operation mode of the 220kV system is that all plant units connected to the system of the power grid are fully opened, all main transformers of thermal power and hydropower are put into operation, and the system is operated and accessed according to a normal mode or a change mode appearing in a regulation;
the corresponding system operation mode of the maximum impedance value is as follows:
the minimum operation mode of the 220kV system is that all small hydropower stations and thermal power plant units of the power grid are completely stopped, and one station with large capacity in the power substation is stopped, a certain line is powered off, or a bus tie switch is stopped for service maintenance.
3. The system of claim 1, wherein the system comprises a power distribution network fault location module,
all cable parameter information between outgoing lines of all substations in the power distribution system and the No. 1 pole is recorded in the cable parameter database, the cable parameter information comprises the maximum allowable current-carrying capacity of the cable, the length of the cable, the cross-sectional area of a wire core and the material characteristics of the cable, the impedance value of the cable is calculated according to the length of the cable, the cross-sectional area of the wire core and the material characteristics of the cable, and the maximum allowable current-carrying capacity is used as the reference dimension of safe operation of the power distribution system.
4. The system of claim 1, wherein the system comprises a power distribution network fault location module,
and the No. 1 pole carries out load distribution in an overhead line mode, calculates the unit impedance value of the overhead line according to the material, the length, the cross section area and the temperature value of each level of overhead line and records the unit impedance value in an overhead line parameter database.
5. The distribution network fault rapid positioning system based on the short-circuit current as claimed in claim 1, 2, 3 or 4, characterized in that the impedance of the distribution system is affected by the power increase and draw, the impedance of the distribution system can only determine a maximum value and a minimum value range, the impedance value of the system is between the maximum value and the minimum value, when the unit is started up, the impedance of the system and the load show a certain trend, and the one-to-one correspondence between the load data range and the system impedance data range is established by obtaining the coupling relationship between the load and the operation mode for a long time, so as to achieve the correction and the self-adaptive adjustment of the calculated value of the impedance of the system; dividing the whole network load into four demand time periods according to the load demand: 17:00-08:00, 08:00-11:00, 11:00-13:00, 13:00-17:00, four load demand periods correspond to four operation modes of the power distribution system, wherein the operation modes of the valley period corresponding to 17:00-08:00 are as follows: the system unit runs less, and the system impedance value above 220kV is larger; the operation mode of the flat valley time period corresponding to 11:00-13:00 is in a midstream state of the operation place of the system unit above 220 kV; a median time interval corresponding to 08:00-11:00 and an intermediate state of a system unit running position above 220 kV; the unit runs more in the peak time period corresponding to 13:00-17:00 and the system load time period of more than 220kV, and the system impedance of more than 220kV is smaller.
6. The system of claim 1, wherein the system comprises a power distribution network fault location module,
the method comprises the following steps of calling impedance values of each line from each database of a basic database unit, wherein the impedance values are per-unit values of parameters corresponding to positive sequence impedance and zero sequence impedance, measuring 100 megavolt-ampere by using reference capacity, averaging voltage by using reference voltage, and establishing a fault positioning model according to a relay protection principle, wherein the formula is as follows:
wherein, KdIs the short circuit coefficient; i isd-reference short circuit current; i isdIs the actual short circuit current; N-CT transformation ratio; alpha is a corresponding operation mode; beta-full network load period; xs *-a system impedance value; xdl *-a cable impedance value; z*-overhead line unit impedance value; l-distance of fault point to pole number 1.
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| CN118011135B (en) * | 2024-04-09 | 2024-06-14 | 江苏联能电力科学研究院有限公司 | Multichannel electric energy quality analysis and data processing method |
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