CN113783174A - A kind of lightning strike and abnormal transmission line protection method and system - Google Patents
A kind of lightning strike and abnormal transmission line protection method and system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/36—Arrangements for transfer of electric power between AC networks via a high-tension DC link
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
本发明公开了一种防雷击和异常输电线路保护系统，包括防雷单元、检测单元、电源调节单元、控制单元及工控机集成系统；其中，所述检测单元与所述防雷单元、所述电源调节单元、所述控制单元及所述工控机集成系统分别连接。本发明的系统设备构造简单，成本低，保护方法简单，能够实时检测和准确启动防雷保护，实现对输电线路的保护，保障了输电安全。
The invention discloses a lightning protection and abnormal transmission line protection system, comprising a lightning protection unit, a detection unit, a power supply adjustment unit, a control unit and an industrial computer integrated system; wherein, the detection unit is connected with the lightning protection unit, the The power conditioning unit, the control unit and the industrial computer integrated system are respectively connected. The system equipment of the invention is simple in structure, low in cost, simple in protection method, capable of real-time detection and accurate start of lightning protection, realizes protection of power transmission lines, and ensures power transmission safety.
Description
Technical Field
The invention relates to the technical field of power transmission line protection, in particular to a method and a system for protecting a lightning and abnormal power transmission line.
Background
The method is widely applied to long-distance power transmission, large-area power grid interconnection, underground cable power transmission and the like. The transmission line is responsible for electric energy transmission between the energy source 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. Therefore, it is not necessary to protect the transmission line, especially in thunderstorm weather, to prevent and protect the transmission line from serious accidents.
Disclosure of Invention
The invention aims to provide a method and a system for protecting an abnormal power transmission line and lightning protection to solve the problems in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: the lightning protection and abnormal power transmission line protection system comprises a lightning protection unit, a detection unit, a power supply adjusting unit, a control unit and an industrial personal computer integrated system; the detection unit is connected with the lightning protection unit, the power supply adjusting unit, the control unit and the industrial personal computer integrated system respectively.
Preferably, in the technical scheme, the lightning protection unit is used for protecting the power transmission line from lightning so as to maintain normal operation of the power transmission line or reduce damage of the lightning to the power transmission line.
Preferably, in this technical scheme, the lightning protection unit includes tertiary lightning protection device and lightning current sensor, and lightning current is discharged through the lightning protection of one-level lightning protection device earlier, and then exports after the lightning protection of second grade lightning protection device is discharged through power isolation inhibitor back, tertiary lightning protection device with the second grade lightning protection device passes through the switch parallelly connected, carries out different lightning protection rank according to different lightning current and selects, the N end of one-level lightning protection device connects the earth connection behind a gas discharge tube, the lightning current sensor cover is located on this earth connection.
Preferably, in the technical scheme, the power supply adjusting unit is configured to modulate the voltage of the power transmission line to provide a working voltage to the detecting unit, the lightning protection unit, the control unit and the industrial personal computer integrated system.
Preferably, in the technical scheme, the detection unit is configured to detect voltage, current, harmonic, and surge of the power transmission line in real time, and provide a data basis for prejudgment of the control unit and rechecking of the industrial personal computer integrated system.
Preferably, in the technical scheme, the control unit is configured to compare detection data of the detection unit with a parameter threshold to perform system working mode prejudgment, and send a prejudgment result to the industrial personal computer integrated system to perform recheck, or directly control the lightning protection unit to perform power transmission line protection.
Preferably, in the present technical solution, the control unit includes a database subunit and a control system;
the database subunit comprises a database module and a parameter management module, wherein the parameter management module is used for setting a voltage threshold, a current threshold, a harmonic threshold and a surge threshold of a starting protection mode so as to provide data processing reference for the control subsystem;
and the data path module is used for storing the data confidence of the protection system.
Preferably, in the technical solution, the control subsystem includes a data processing module, a load execution module, an alarm control module, and a line restoration module;
the data processing module acquires detected real-time data information from the database module, acquires a preset parameter threshold value from the parameter management module, analyzes and processes the real-time data information and the parameter threshold value to generate corresponding digital signals, and sends the digital signals to the load execution module, the alarm control module and the circuit recovery module or directly transmits the digital signals to the industrial personal computer integrated system.
Another object of the present invention is to provide a protection method for protecting a power transmission line against lightning and abnormality, comprising the steps of:
s10, starting a power supply adjusting unit;
s20, the industrial personal computer integrated system carries out real-time online monitoring on the protection system;
s30, judging the line monitoring state to determine whether to enter protection;
and S40, closing the input power supply and starting lightning protection and overvoltage protection.
Preferably, in the present invention, the step S20 includes the following steps:
s21, the detection unit carries out multiple detection sampling on the current, the voltage and the harmonic wave of the power transmission line;
s22, the control unit prejudges the actual data information detected by the detection unit and sends the prejudgment result to the industrial personal computer integrated system;
s23, the IPC integrated system rechecks the prejudgment result of the control unit according to the detection data of the detection unit;
and S24, judging whether to carry out the protection state mode according to the rechecking result.
Compared with the prior art, the invention has the following beneficial effects:
the system has the advantages of simple equipment structure, low cost and simple protection method, can detect in real time and accurately start lightning protection, realizes the protection of the power transmission line and ensures the power transmission safety.
Drawings
FIG. 1 is an architectural diagram of a protection system of the present invention;
FIG. 2 is an architecture diagram of the control unit of the present invention;
FIG. 3 is a flow chart of a protection method of the present invention;
FIG. 4 is a flow chart of a monitoring and determining method according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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.
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; details of the same or similar concepts or processes may not be repeated in some embodiments.
Referring to fig. 1, the protection system for power transmission lines with lightning protection and abnormality according to the present invention includes a lightning protection unit 10, a detection unit 20, a power adjustment unit 30, a control unit 40, and an industrial personal computer integrated system 50. The detection unit 20 is connected to the lightning protection unit 10, the power adjustment unit 30, the control unit 40, and the industrial personal computer integrated system 50.
Further, the lightning protection unit 10 is configured to protect the power transmission line from lightning strikes, so as to maintain normal operation of the power transmission line or reduce damage to the power transmission line from lightning strikes. In this embodiment, the lightning protection unit 10 at least includes a third-level lightning protection device and a lightning current sensor, lightning current is discharged through the lightning protection of the first-level lightning protection device, and then is output after being discharged through the lightning protection of the second-level lightning protection device after passing through the power isolation suppressor, the third-level lightning protection device and the second-level lightning protection device are connected in parallel through the switch, and different lightning protection levels are selected according to different lightning currents. The N end of the primary lightning protection device is connected with a grounding wire through a gas discharge tube, and the lightning current sensor is sleeved on the grounding wire. In addition, the lightning protection unit 10 may also be selected from other devices capable of protecting against lightning strikes.
Further, the power supply adjusting unit 30 is configured to modulate the voltage of the power transmission line to provide a working voltage to the detecting unit 20, the lightning protection unit 10, the control unit 40, and the industrial personal computer integrated system 50. In this embodiment, the power supply adjusting unit 30 at least includes an AD/DA converter, a booster and a voltage stabilizer, the AD/DA converter is used to convert the voltage of the power transmission line (commercial power) into the voltage used for the operation of the lightning protection device, the sensor, etc., the booster is used to convert the commercial power into the working voltage required by the industrial personal computer integrated system 50, and the voltage stabilizer is used to stabilize the output voltage of the power supply adjusting unit 30, so as to maintain the stable operation of the detecting unit 20, the lightning protection unit 10, the control unit 40 and the industrial personal computer integrated system 50, and reduce the occurrence of errors and false judgments.
Further, the detection unit 20 is configured to detect voltage, current, harmonic, surge, and the like of the power transmission line in real time, and provide a data basis for pre-determination of the control unit 40 and review of the industrial personal computer integrated system 50. In the present embodiment, the detecting unit 20 at least includes a voltage detecting module, a current detecting module, a harmonic detecting module and a surge detecting module. The voltage detection module, the current detection module, the harmonic detection module and the surge detection module are realized by adopting the following specific scheme:
the voltage detection module or the current detection module preferably adopts an integrated 24-path alternating current or voltage data acquisition module, adopts a high-precision current/voltage transformer to realize signal isolation and sensing, adopts a special true effective value measurement chip for signal measurement to accurately measure current/voltage true effective values of various waveforms, and carries out data communication based on a standard RS-485 bus interface and an MODBUS-RTU protocol.
The harmonic detection module is a harmonic detector, specifically uses a Fourier transform method to perform harmonic measurement, and uses Fourier transform to perform harmonic analysis on a plurality of integral periodic waveforms.
The surge detection module can adopt a CPLD and an AD9240 to carry out module design of a lightning surge signal detection circuit, collects attenuated surge signals through the AD9240 with 14 bits, stores digital signals in an SRAM through CPLD coordination control, reads SRAM data through an MCU, retains a larger value and then transmits the data to an upper PC, and finally outputs the processed peak value.
Further, the control unit 40 is configured to compare the detection data of the detection unit 20 with a parameter threshold to perform system working mode prejudgment, and send a prejudgment result to the industrial personal computer integrated system 50 for rechecking, or directly control the lightning protection unit 10 to perform power transmission line protection. In this embodiment, as shown in fig. 2, the control unit 40 at least includes a database subunit 41 and a control system 42, where the database subunit 41 includes a database module 411 and a parameter management module 412, and the parameter management module 412 is configured to set a voltage threshold, a current threshold, a harmonic threshold, and a surge threshold of the startup protection mode, so as to provide a data processing reference for the control subsystem 41. The data path module 411 is used to store the data confidence of the protection system.
Further, the control subsystem 42 includes a data processing module 421, a load execution module 422, an alarm control module 423, and a line restoration module 424. During operation, the data processing module 421 obtains the detected real-time data information from the database module 411, and simultaneously obtains the preset parameter threshold from the parameter management module 412, and analyzes and processes the real-time data information and the parameter threshold to generate a corresponding digital signal, and sends the digital signal to the load execution module 422, the alarm control module 423 or the line recovery module 424, or directly transmits the digital signal to the industrial personal computer integrated system 50. In the process, rules of analysis and processing are agreed, real-time detection data are compared with a threshold value to obtain a comparison difference value, and when the comparison difference value is a negative number, a-1 digital signal is output and directly transmitted to the industrial personal computer integrated system 50 to indicate that the existing working state is maintained and lightning protection is not started; when the comparison difference is 0 or positive, a 0 digital signal is output and directly transmitted to the industrial personal computer integrated system 50 for rechecking, which indicates that the lightning protection is started, the alarm control module 423 alarms, and the protection circuit of the load execution module 422 is started at the same time. When the comparison difference changes from positive to negative, the line restoration module 424 is activated to perform line restoration and repair.
More specifically, the voltage parameter threshold can be defined as U0(ii) a Current parameter threshold of I0(ii) a The surge threshold value is
Wherein V0The rated surge voltage is the rated surge voltage when the system is in a standard working state, and t is the time for rising to the standard reference voltage; the detected real-time voltage parameter is Us(ii) a Current parameter threshold of Is(ii) a Surge threshold value of EsIn which V issDefining the output function of the control signal as F according to the prejudgment rule of the invention for the surge voltage when the system is in the working state and s is the real-time of detectionS(Us,Is,Es)，FS(Us, Is, Es) Is represented by the following formula:
wherein λ is the surge voltage change rate, a is the maximum peak value of the surge voltage, s represents time, | | Es||2,1And (3) expressing a norm range value, namely calculating the change rate by comparing two numbers, thereby defining 1-2 periods as the internal surge change rate, wherein the internal product is a range sign, the singular number is an absolute value, and the even number is a norm. When the above formula is used to calculate the definition result, it is necessary to determine whether to start the lightning protection according to the set threshold range, for example, when F is usedS(Us, Is, Es) in the set threshold range:
and if the current value is not within the set threshold value range, starting the lightning protection.
In addition, the result can also be defined by the judgment criterion of the invention, and the judgment logic criterion is as follows:
when U is turneds≧U0Then F isS(Us,Is,Es)＝0；
When I iss≥I0Then F isS(Us,Is,Es)＝0；
When in use
Then FS(Us,Is,Es)＝0；
When U is turneds<U0Then F isS(Us,Is,Es)＝-1；
When I iss<I0Then F isS(Us,Is,Es)＝-1；
When in use
Then FS(Us,Is,Es)＝-1。
Further, the industrial personal computer integrated system 50 is used for accurately monitoring operation, controlling the detection unit, the control unit and the lightning protection unit, and providing functions of parameter setting, historical data query and statistics, fault record query and the like for a user.
The invention relates to a protection method of a lightning and abnormal power transmission line protection system, which comprises the following steps:
s10, starting a power supply adjusting unit;
s20, the industrial personal computer integrated system carries out real-time online monitoring on the protection system;
s30, judging the line monitoring state to determine whether to enter protection;
and S40, closing the input power supply and starting lightning protection and overvoltage protection.
Further, the specific process in step S20 includes the following steps:
s21, the detection unit carries out detection sampling on the current, the voltage, the harmonic wave and the like of the power transmission line for a plurality of times;
s22, the control unit prejudges the actual data information detected by the detection unit and sends the prejudgment result to the industrial personal computer integrated system;
specifically, the control unit calculates a comparison difference value according to the comparison between the real-time detection data and the threshold value, and performs security level pre-judgment according to the comparison difference value, wherein the pre-judgment rule is as follows:
(1) and when the comparison difference is negative, outputting a-1 digital signal, pre-judging as safe, and requiring to keep the current operation working state.
(2) And when the comparison difference is 0 or positive number, outputting a 0 digital signal, prejudging as dangerous, requesting to start a protection mode, and performing lightning protection.
More specifically, the voltage parameter threshold can be defined as U0(ii) a Current parameter threshold of I0(ii) a The surge threshold value is
Wherein V0The rated surge voltage is the rated surge voltage when the system is in a standard working state, and t is the time for rising to the standard reference voltage; the detected real-time voltage parameter is Us(ii) a Current parameter threshold of Is(ii) a Surge threshold value of EsIn which V issDefining the output function of the control signal as F according to the prejudgment rule of the invention for the surge voltage when the system is in the working state and s is the real-time of detectionS(Us, Is, Es) are:
when U is turneds≧U0、Is≥I0Or
Then, FS(Us,Is,Es)＝0；
When U is turneds<U0、Is<I0Or
Then, FS(Us,Is,Es)＝-1；
S23, the IPC integrated system rechecks the prejudgment result of the control unit according to the detection data of the detection unit;
specifically, the industrial personal computer integrated system directly obtains real-time detection data from the detection unit, compares the real-time detection data with a threshold value, calculates to obtain a comparison difference value, compares the comparison difference value according to the comparison difference value of the control unit, compares the comparison result to be consistent, and controls each unit to execute a current pre-judgment working mode, wherein the rechecking result is +1, which indicates that the control unit is authorized to pre-judge the current. And if the comparison results are inconsistent, the collected detection data are rechecked for three times at intervals of 0.2s, and if two times of inconsistency occur in the three times, the lightning protection unit is selected to be started to enter a power transmission line protection mode.
And S24, judging whether to carry out the protection state mode according to the rechecking result.
In conclusion, the system provided by the invention has the advantages of simple equipment structure, low cost and simple protection method, can detect and accurately start lightning protection in real time, realizes the protection of the power transmission line and ensures the power transmission safety.
The component structures, connection relationships, operation principles, and the like, which are not described in the present embodiment, are realized by using the prior art, and a description thereof will not be repeated.
The present invention also provides a readable storage medium, in which a computer program is stored, which, when being executed by a processor, is adapted to implement the methods provided by the various embodiments described above.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
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| CN114552551A (en) * | 2022-02-28 | 2022-05-27 | 国网上海市电力公司 | Multi-station fusion edge data center lightning protection device and sampling control method |
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