CN207181595U - The fault locator of distribution line status monitoring, fault pre-alarming and location technology based on distributed phasor measurement - Google Patents
The fault locator of distribution line status monitoring, fault pre-alarming and location technology based on distributed phasor measurement Download PDFInfo
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Abstract
The fault locator of a kind of distribution line status monitoring based on distributed phasor measurement, fault pre-alarming and location technology is the utility model is related to, it includes current monitoring unit, voltage monitoring unit, collects unit and main website；Voltage during normal operation, current monitoring unit are every 15min by the load voltage of the circuit collected, current set point data, which are actively transported to, collects unit, main website is uploaded to after collecting element analysis, processing, and the line status in main website by the interface display mode such as figure, curve, form, intuitively presentation distribution line.The utility model cost is low, cost-effective, can be powered easy for installation, non-maintaining；Electric current, the voltage waveform of each monitoring point can be enrolled；Section where singlephase earth fault, short trouble occurs can be accurately positioned.
Description
Technical field
A kind of fault locator is the utility model is related to, belongs to a kind of power technology and equipment, more particularly to a kind of base
In the fault locator of the distribution line status monitoring of distributed phasor measurement, fault pre-alarming and location technology, suitable for 6.6
Power distribution networks of~the 35kV based on overhead line, quickly, it can be accurately positioned when short circuit, earth fault occurs.
Background technology
The widely used small current neutral grounding mode of China's 6~35kV power distribution networks, its major failure include short trouble and single-phase
Earth fault.Because distribution line connects transmission side and electricity consumption side, have the characteristics that distribution is wide, circuit is long, trouble shoot difficulty.Mesh
The distribution automation transformation of preceding progress realizes the quickly isolating and from extensive of distribution line failure using FTU, DTU and on-load switch etc.
Multiple power supply, the split fix of failure is realized using fault detector, facilitates the lookup of failure.But distribution automation transformation into
This is higher, important line and important node can only be monitored, the accuracy rate of fault detector breakdown judge is low, can not be reliable
Realize being accurately positioned for failure in ground.In addition, the running status and operational factor of distribution line entirety can not be complete by the said equipment
Ground uploads to main website, and operation maintenance personnel can not prejudge the failure that circuit may occur, Wu Fati according to the running status of circuit
It is preceding that early warning is carried out to line fault hidden danger.
Utility model content
The purpose of this utility model is overcome the shortcomings of in prior art, there is provided a kind of matching somebody with somebody based on distributed phasor measurement
The fault locator of the monitoring of netting twine line state, fault pre-alarming and location technology.The positioner can be determined quickly and accurately
Trouble point, and suitable for metallic earthing, through arcing ground, through the various faults situation such as transition resistance eutral grounding.Positioner energy
It is enough to realize " two is distant " function, there is the features such as cost is low, cost-effective, easy for installation, non-maintaining.Relative to distribution automation
Transformation reduces the investment of user, and cost performance is higher.
The technical solution of the utility model is as follows：
The fault location dress of distribution line status monitoring, fault pre-alarming and location technology based on distributed phasor measurement
Put, including current monitoring unit, voltage monitoring unit, collect unit and main website；
The voltage-type monitoring unit is arranged in transformer station, voltage-type monitoring unit sampling circuit voltage, and by voltage
Signal is directly uploaded to main website with frequency with current signal with phase；
The current monitoring unit is arranged on distribution line, and current monitoring unit is by the electric current of monitoring, electric-field intensity, temperature
The parameter of degree is transmitted to collecting unit；
The unit that collects on the overhead transmission line shaft tower, collect unit receive current monitoring unit transportation electric current,
Electric-field intensity, temperature parameter are realized simultaneously synthesizes zero-sequence current by A, B, C three-phase current, passes through GPRS modes teletransmission to main website；
The main website is arranged in transformer station or control centre, reception respectively collect what is transmitted on unit and voltage monitoring unit
Data, using figure, curve, spreadsheet interface display mode, intuitively show the state of distribution line.
Described voltage monitoring unit uses electronic type voltage transformer.
The current monitoring unit includes Rogowski coil, integrating circuit, A/D modular converters, MCU module, GPS module and number
According to transceiver module；Described Rogowski coil, integrating circuit, A/D modular converters, MCU module are sequentially connected, GPS module and data
Transceiver module is connected with MCU module, and storage capacitor, prison are sequentially provided between GPS module and data transmit-receive module and Rogowski coil
Control circuit and electrochemical capacitor.
Described integrating circuit is OPA2379 amplifiers and OPA2349 amplifiers.
Described supervisory circuit is NCP304LSQ45T1G, IRLML2502 or IRLML6402 voltage monitoring circuit.
The unit that collects includes data transmit-receive module（RF）, FLASH storage modules, microprocessor module（MCU）, the whole world
Positioning system modules（GPS）, communication module, real-time clock module（RTC）, watchdog circuit module（WDT）, wireless communication module
（GPRS）；Data transmit-receive module, FLASH storage modules, GPS module, communication module are connected with MCU module respectively；Described MCU
Module is connected with RTC real-time clock modules and WDT watchdog circuits；The communication module is connected with wireless communication module（GPRS）
And test port.
The unit that collects also includes solar cell, and solar cell is powered as active and standby power supply to collect unit.
The advantages of this fault locator, is as follows：
1st, cost is low, cost-effective, can be powered easy for installation, non-maintaining.
2nd, electric current, the voltage waveform of each monitoring point can be enrolled.
3rd, collect unit recording can synchronous three-phase voltage, electric current timer error be less than 100us, zero-sequence current can be synthesized
Waveform.
4th, section where singlephase earth fault, short trouble occurs can be accurately positioned.
5th, suitable for 6~35kV neutral non-effective groundings, the distribution network systems of effective grounding, it can differentiate that metallicity connects
Ground, arc grounding, through the various faults earthing type such as small resistor, high resistance ground.
6th, main website can disturb recorder data and number to the data statistics of monitoring unit instantaneity earth fault, using by circuit
According to the technology such as the goodness of fit of earth fault typical data, matching degree comparative analysis and fuzziness judgement in storehouse, to distribution netting twine
Road earth fault early warning and the evaluation of circuit health status.
Brief description of the drawings
Fig. 1 is the system general diagram of this fault locator；
Fig. 2 is current monitoring cellular system general diagram；
Fig. 3 is to collect cellular system general diagram；
The circuit diagram of short circuit current when Fig. 4 is short trouble；
The circuit diagram of zero-sequence current when Fig. 5 is singlephase earth fault；
Fig. 6 is integrating circuit figure of the current mode monitoring unit based on Rogowski coil to high current；
Fig. 7 is integrating circuit figure of the current mode monitoring unit based on Rogowski coil to low current；
Synthesis process circuit figure of Fig. 8 current modes monitoring unit to two paths of signals；
Fig. 9 is current mode monitoring to large and small current signal on-off control circuit figure.
In Fig. 1,1, collect unit, 2, transformer station, 3, monitor the current monitoring unit of normal current, 4, monitoring fault current
Current monitoring unit, 5, trouble point, 6, substation bus bar, 7, wireless telecommunications, 8, overhead transmission line.
Embodiment
It is as shown below, this fault locator is described in further detail by specific embodiment.
Embodiment
A kind of fault location dress of the distribution line status monitoring of distributed phasor measurement, fault pre-alarming and location technology
Put, including current monitoring unit, voltage monitoring unit, collect unit and main website；
The voltage-type monitoring unit is arranged in transformer station, voltage-type monitoring unit sampling circuit voltage, and by voltage
Signal is directly uploaded to main website with frequency with current signal with phase；Described voltage monitoring unit uses electronic type voltage mutual inductance
Device.
The current monitoring unit is arranged on distribution line, and current monitoring unit is by the electric current of monitoring, electric-field intensity, temperature
The parameter of degree is transmitted to collecting unit；The current mode monitoring unit include Rogowski coil, integrating circuit, A/D modular converters,
MCU module, GPS module and data transmit-receive module；Described Rogowski coil, integrating circuit, A/D modular converters, MCU module are successively
Connection, GPS module and data transmit-receive module are connected with MCU module；Between GPS module and data transmit-receive module and Rogowski coil according to
It is secondary to be provided with storage capacitor, supervisory circuit and electrochemical capacitor；Described integrating circuit is that OPA2379 amplifiers and OPA2349 amplify
Device；Described supervisory circuit is NCP304LSQ45T1G, IRLML2502 or IRLML6402 voltage monitoring circuit.
The unit that collects includes data transmit-receive module（RF）, FLASH storage modules, microprocessor module（MCU）, the whole world
Positioning system modules（GPS）, communication module, real-time clock module（RTC）, watchdog circuit module（WDT）, wireless communication module
（GPRS）；Data transmit-receive module, FLASH storage modules, GPS module, communication module are connected with MCU module respectively；Described MCU
Module is connected with RTC real-time clock modules and WDT watchdog circuits；The communication module is connected with wireless communication module（GPRS）
And test port.The unit that collects also includes solar cell, and solar cell supplies as active and standby power supply to collect unit
Electricity.
The main website is arranged in transformer station or control centre, reception respectively collect what is transmitted on unit and voltage monitoring unit
Data, using figure, curve, spreadsheet interface display mode, intuitively show the state of distribution line.
Fault location is realized by the following method in this fault locator：
Voltage, current monitoring unit are electric by the load of the circuit collected every 15min (time can set) during normal operation
It is sent in the fixed-point data actives such as pressure, electric current and collects unit, is uploaded to main website after collecting element analysis, processing, and lead in main website
The interface display mode such as figure, curve, form is crossed, the line status of distribution line is intuitively presented.
After short trouble occurs for circuit, because short-circuit current is big, current monitoring unit utilizes the high current of mutation,
Warning information is simultaneously collected unit by direct alarm by close distance radio frequency communication transfer, is collected unit and is passed through warning information
For GPRS transmission to main website, main website combines the warning information that all monitoring points upload, if bus collects to some between unit
All units that collect all detect mutation high current information, and other units that collect can't detect this mutation current signal, then
It may determine that these collect unit and are all located on failure path.The position of the final localization of faults, realizes phase fault point
Section positioning function.
When singlephase earth fault occurs for system, voltage monitoring unit collection bus residual voltage signal, and each bar outlet
Zero sequence current signal, select faulty line using the faulty line selection technology merged based on a variety of selection methods while enroll bus zero
Sequence voltage waveform, and fault message and voltage waveform are transferred to main website；With this simultaneously, current monitoring list on the line is installed
Member enrolls A, B, C three-phase current waveform of each monitoring point（In order to ensure the comparativity of current phase, monitoring point current detecting dress
Put when being synchronized pair using GPS）, waveform transfer is given by close distance radio frequency communication and collects unit with bar position, collects list
Waveform is utilized A, B, C three-phase current Waveform composition zero-sequence current of each monitoring point by member by GPRS transmission to main website, main website
Waveform, and compared with bus residual voltage waveform inlet wire.
1) when some monitoring point detect zero-sequence current lag 90 ° of residual voltage, then illustrate the monitoring site in failure road
On footpath；
2) when some monitoring point detects 90 ° of the advanced residual voltage of zero-sequence current, then illustrate the monitoring point not on failure road
On footpath.
3) when bus is identical to all monitoring point zero-sequence current phases between some monitoring point, and with other monitoring points zero
Sequence electric current is on the contrary, then illustrate that these monitoring points are all located on failure path.
Main website comprehensively utilizes above-mentioned relation, with reference to all monitoring point zero-sequence currents and residual voltage, zero-sequence current and zero sequence
Electric current comparative result, the position of the final localization of faults, realize Single-phase Ground Connection Failure section positioning function.
As shown in figure 1, current monitoring unit is arranged on overhead transmission line, substation exit, branched line are mostly installed at,
It can be installed according to the multiple positions of importance of circuit, collect unit and be arranged on and the outdoor aerial near current monitoring unit
On line bar tower, the load data, the wave file that are sent for receiving, on repeat current monitoring unit.Current monitoring unit letter
" B " is represented, every group of current monitoring unit is 3, on A, B, C three-phase line of circuit, multiple current monitoring units point
Not Yong B1, B2 ... BN are represented, are collected unit and are represented with " C ", and multiple units that collect use C1 respectively, C2 ... CN expressions；" D " table
It is shown as voltage monitoring unit, collection bus residual voltage, zero-sequence current, wave file and by gathered data information and wave file
Directly it is uploaded to main website." A " is expressed as main website, and main station system is industrial control computer, voltage monitoring list in receiving station of main website
The data and waveform transmitted in member and current monitoring unit, using figure, the interface display mode such as curve, form, it is in intuitively
Reveal the state of circuit.Main website can be accurate to calculate institute of being out of order using different fault diagnosis criterion according to the whole network synchrodata
Section.
For phase fault positioning strategy：As shown in Figure 4, it is assumed that B, C double earthfault occurs in f points, due to short circuit
Electric current is very big, and so all terminals on the path of upstream 02 of f points can detect this short circuit current signal, and in f
All terminals on the path of downstream 23 of point all can't detect this short circuit current signal.Therefore deduce that phase fault
The method of positioning：If bus all detects mutation high current information to all terminals between some terminal, and other-end is examined
This mutation current signal is not detected, then may determine that these terminals are all located on failure path.
For the positioning strategy of single-phase earthing：As shown in Figure 5, it is assumed that singlephase earth fault occurs between online road 1 and 2,
The unified direction for set bus sensing circuit as electric current reference direction, we can find 0 to 1 between, 1 between trouble point
90 ° of residual voltage of zero-sequence current hysteresis (i.e. zero-sequence current and residual voltage are dereferenced reference direction), other branch road zero sequences electricity
Stream is still advanced 90 ° of residual voltage (i.e. zero-sequence current and residual voltage are associated reference direction)；And between 0 to 1,1 to therefore
The zero-sequence current opposite in phase of zero-sequence current and other branch roads between barrier point.Thus we just show that singlephase earth fault positions
Two methods：1. if residual voltage can be measured in transformer station, the terminal device of each branch road of the whole network is all according to positive reason
Current reference direction under condition carries out zero-sequence current detection, while carries out phase-contrast with power network residual voltage, if some terminal
Detect that zero-sequence current lags 90 ° of residual voltage, then illustrate that the terminal is located on failure path, if otherwise some terminal zero sequence electricity
Advanced 90 ° of residual voltage is flowed, then illustrates the terminal not on failure path.2. if zero sequence electricity can not be measured in transformer station
Pressure, then analyze the zero-sequence current phase relation that each terminal detects, if bus is to all terminal zero sequences between some terminal
Current phase is identical, and with other-end zero-sequence current on the contrary, then may determine that these terminals are all located on failure path.
Above-mentioned localization method is applied to isolated neutral system, but because transient current signal is not mended by arc suppression coil
The influence repaid, therefore for arc suppression coil earthing system, fault location is also applied for using transient signal.This fault locator
Algorithm is extended, useful feature component is extracted from each transient current collected in unit, fault signature is carried out
Fusion.All fault characteristic informations for collecting unit are contrasted, the unit one that collects with same fault characteristic information is positioned at event
Hinder on path, so as to realize accurate fault location.
The feature of each section zero-sequence current on lower surface analysis neutral by arc extinction coil grounding system neutral road.Analyze zero sequence
Network as illustrated, due to the compensation of arc suppression coil, the zero-sequence current phase on failure path by advanced 90 ° of residual voltage, and
Behind trouble point and non-faulting branch zero-sequence current phase also advanced 90 ° of residual voltage.It will be apparent that the regular link on bus
90 ° of the advanced residual voltage of the zero-sequence current phase of upper backbone and branch, zero-sequence current and normal branch road on failure path
The same phase of zero-sequence current.
Transient zero-sequence current is characterized in：Transient process beginning for a period of time (be typically 1 cycle), arc suppression coil
Inductive current amplitude is smaller, therefore similar with isolated neutral system, the transient zero-sequence along failure path closer to trouble point
Current amplitude is bigger, transient zero-sequence current and the line after non-fault line, non-faulting branch road and trouble point of failure path
The transient zero-sequence current on road is in opposite direction.
Fig. 6,7,8,9 are that current mode monitoring unit is handled the integrating circuit of current signal based on Rogowski coil.
Rogowski coil is a kind of coil of hollow circular, is called and makees current measurement coil or differential current sensor, because of it
Exclusive characteristic and be widely used in each field and measure.The characteristic of Rogowski coil includes：Without ferrimagnet, no magnetic hysteresis
Effect, no magnetic saturation phenomenon, almost nil phase error.Due to without magnetic saturation phenomenon, the current measuring range of Rogowski coil
Can be from several amperes to kilo-ampere.
Although Rogowski coil is a kind of coil of quite preferable current measurement, because of output voltage and input current signal
Differential is directly proportional, and driving force is low, and the output voltage of secondary side needs that primary side electricity could be reduced after integration and amplification
Flow the wave character of signal.Based on this reason, integrating amplification circuit just turns into the key of Rogowski coil output signal processing.Electric current
The Rogowski coil primary side input current that type monitoring unit uses will can cover as little as 3A to up to 600A scope.Integrated
During enhanced processing, the error of amplitude will be controlled within 1%, and Phase-offset control is within 1.8 °.
Fig. 6 be high current signal Quick Acquisition circuit using first integrate the order amplified afterwards to input signal at
Reason, the ability of signal acquisition change can be improved, improve signal acquisition speed, faster response is mutated to transient state.To put integration
The phase of signal is tried one's best after big reaches consistent with the phase of primary side input current, and integrating circuit careful must select R-C parameters, by phase
Deviation is controlled within 1.8 °.Situations such as high current signal is usually inrush phenomenon, artificial switching, transient fault causes, and it is special
Levy, signal frequency height big to change slope.Therefore, high-pass filtering is used in the Acquisition Circuit of high current signal, to less than
300Hz signal is decayed.The selection of multiplication factor is according to being measuring amplitude scope in integrating circuit（600A or so）1.2
Times amplitude corresponding A D mouth full scale level.
Fig. 7 is that the accurate measuring circuit of low current signal is put using first amplifying the order that integrates afterwards and can improve low current signal
Big AC characteristics, reach precise acquisition purpose, smaller to the error of steady state measurement.Positive pole amplifying circuit has very high input resistance
Anti-, higher gain, more preferable noise characteristic are anti-interference.Because Rogowski coil does not possess sufficiently large driving energy in output end
Power, it is connected to after Rogowski coil output end and is greatly lowered because of gain error using the positive pole amplifying circuit of high input impedance
The deviation for causing signal waveform to distort.Low current signal is the line load current signal under steady-working state, it is characterized in that
It is small to change slope, frequency is harmonic wave in 50Hz and its 5 time.Low-pass filter circuit is used in circuit filtering processing, to more than 300Hz
Signal decayed.
Fig. 8 is the synthesis processing of two paths of signals.Same input signal is passed through into Quick Acquisition circuit and accurate measurement electricity
Waveform obtained by behind road is overlapped.Integration in two measuring circuits selects consistent R-C aspect ratios, to keep big letter
It is number consistent with the phase of small signal amplification circuit, the accuracy of composite signal is not influenceed.
Fig. 9 is the division control of low current signal.Needed in the front end of high current and low current signal synthesis circuit to small
Current signal carries out the switch control of break-make.Low current signal is electric through amplifier isolation and diode, connection again after amplification
One is produced after container to put down compared with galvanic current.This level and reference voltage are contrasted with comparator, the DC level is higher than
Then comparator output control closes metal-oxide-semiconductor to threshold reference voltage, low current signal is disconnected to the connection of combiner circuit；The direct current
Less than threshold reference voltage, then comparator output control turns on metal-oxide-semiconductor to level so that low current is signally attached to superposition synthesis electricity
Road.
Current monitoring unit collection signal is sampled after integrating circuit is handled by A/D modular converters, is input to MCU moulds
Block analysis is handled.At the same time GPS module starts three phase clock synchronization, ensures that three-phase current, electric field trigger recording simultaneously；Recording
Data are sent to collecting unit by data transmit-receive module request；Collect the request of data that unit receives current monitoring unit,
Agreement according to agreement receives the data that current monitoring unit is sent, and stores in FLASH memory modules, with MCU module data
Interaction, collecting unit synchronized compound three-phase voltage, electric current after processing, and three-phase synthesis timer error is less than 100us, with standard
101 agreements upload to main website.
Claims (7)
1. the fault locator of distribution line status monitoring, fault pre-alarming and location technology based on distributed phasor measurement,
It is characterized in that including current monitoring unit, voltage monitoring unit, collect unit and main website；
The voltage-type monitoring unit is arranged in transformer station, voltage-type monitoring unit sampling circuit voltage, and by voltage signal
With current signal directly main website is uploaded to frequency with phase；
The current monitoring unit is arranged on distribution line, and current monitoring unit is by the electric current of monitoring, electric-field intensity, temperature
Parameter is transmitted to collecting unit；
The unit that collects collects electric current, electric field that unit receives current monitoring unit transportation on overhead transmission line shaft tower
Intensity, temperature parameter are realized simultaneously synthesizes zero-sequence current by A, B, C three-phase current, passes through GPRS modes teletransmission to main website；
The main website is arranged in transformer station or control centre, receives the number for respectively collecting and being transmitted on unit and voltage monitoring unit
According to using figure, curve, spreadsheet interface display mode, intuitively showing the state of distribution line.
2. distribution line status monitoring, fault pre-alarming and positioning according to claim 1 based on distributed phasor measurement
The fault locator of technology, it is characterised in that described voltage monitoring unit uses electronic type voltage transformer.
3. distribution line status monitoring, fault pre-alarming and positioning according to claim 1 based on distributed phasor measurement
The fault locator of technology, it is characterised in that the current monitoring unit includes Rogowski coil, integrating circuit, A/D moduluss of conversion
Block, MCU module, GPS module and data transmit-receive module；Described Rogowski coil, integrating circuit, A/D modular converters, MCU module
Be sequentially connected, GPS module and data transmit-receive module are connected with MCU module, GPS module and data transmit-receive module and Rogowski coil it
Between be sequentially provided with storage capacitor, supervisory circuit and electrochemical capacitor.
4. distribution line status monitoring, fault pre-alarming and positioning according to claim 3 based on distributed phasor measurement
The fault locator of technology, it is characterised in that described integrating circuit is OPA2379 amplifiers and OPA2349 amplifiers.
5. distribution line status monitoring, fault pre-alarming and positioning according to claim 3 based on distributed phasor measurement
The fault locator of technology, it is characterised in that described supervisory circuit be NCP304LSQ45T1G, IRLML2502 or
IRLML6402 voltage monitoring circuits.
6. distribution line status monitoring, fault pre-alarming and positioning according to claim 1 based on distributed phasor measurement
The fault locator of technology, it is characterised in that the unit that collects includes data transmit-receive module（RF）, FLASH storage modules,
Microprocessor module（MCU）, GPS module（GPS）, communication module, real-time clock module（RTC）, watchdog circuit
Module（WDT）, wireless communication module（GPRS）；Data transmit-receive module, FLASH storage modules, GPS module, communication module difference
It is connected with MCU module；Described MCU module is connected with RTC real-time clock modules and WDT watchdog circuits；The communication module
It is connected with wireless communication module（GPRS）And test port.
7. distribution line status monitoring, fault pre-alarming and positioning according to claim 6 based on distributed phasor measurement
The fault locator of technology, it is characterised in that the unit that collects also includes solar cell, and solar cell is as active and standby
Power supply is powered to collect unit.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478960A (en) * | 2017-09-11 | 2017-12-15 | 国网辽宁省电力有限公司抚顺供电公司 | The fault locator and localization method of distribution line status monitoring, fault pre-alarming and location technology based on distributed phasor measurement |
| CN113406439A (en) * | 2021-06-23 | 2021-09-17 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Power distribution network fault positioning method |
| CN113433426A (en) * | 2021-08-30 | 2021-09-24 | 国网江西省电力有限公司电力科学研究院 | Method and device for calculating critical fault position of converter bus of direct-current transmission system |
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2017
- 2017-09-11 CN CN201721158291.2U patent/CN207181595U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478960A (en) * | 2017-09-11 | 2017-12-15 | 国网辽宁省电力有限公司抚顺供电公司 | The fault locator and localization method of distribution line status monitoring, fault pre-alarming and location technology based on distributed phasor measurement |
| CN113406439A (en) * | 2021-06-23 | 2021-09-17 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Power distribution network fault positioning method |
| CN113433426A (en) * | 2021-08-30 | 2021-09-24 | 国网江西省电力有限公司电力科学研究院 | Method and device for calculating critical fault position of converter bus of direct-current transmission system |
| CN113433426B (en) * | 2021-08-30 | 2021-12-31 | 国网江西省电力有限公司电力科学研究院 | Method and device for calculating critical fault position of converter bus of direct-current transmission system |
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