CN110031726A - A kind of flexible direct current circuitry fault detection method and device - Google Patents
A kind of flexible direct current circuitry fault detection method and device Download PDFInfo
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- CN110031726A CN110031726A CN201910414939.5A CN201910414939A CN110031726A CN 110031726 A CN110031726 A CN 110031726A CN 201910414939 A CN201910414939 A CN 201910414939A CN 110031726 A CN110031726 A CN 110031726A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
This application discloses a kind of flexible direct current circuitry fault detection method and devices, comprising: obtains each submodule average capacitor voltage of any phase upper and lower bridge arm of flexible direct current route two sides converter station；The type of DC line fault is judged according to the relationship of each submodule average capacitor voltage of upper and lower bridge arm and rated capacity voltage.The technical solution of the application can judge whether DC line occurs monopolar grounding fault or interpolar failure by the information of converter station internal capacitance voltage.For the program by analyzing fault loop, principle is relatively simple, and testing result is reliable, and implementation process requires number of devices less while lower to the requirement of equipment sample rate.
Description
Technical field
This application involves technical field of power systems more particularly to a kind of flexible direct current circuitry fault detection methods and dress
It sets.
Background technique
In the flexible DC transmission engineering that oneself puts into operation, protection of direct current supply line still uses for reference Traditional DC transmission line of electricity
Principles of Relay Protection, route protection performance is extremely difficult to require.On the one hand, when flexible direct current line fault, due to direct current
Hold and directly discharged by faulty line, fault current has climbing speed is fast, amplitude is big to hold a little, can in a short time to system or
Component damages；On the other hand, immature due to dc circuit breaker technology, DC side failure cannot be by dc circuit breaker
It disconnects, in order to eliminate the distortion of DC voltage imbalance caused by line fault, and the electric current of exchange side feed-in is cut off, in converter station
After locking, need to cut off DC line fault by AC circuit breaker.The fault signature of flexible HVDC transmission system is higher than tradition
Press AC and DC line fault more complicated and severe, this is just to the parameter optimization of flexible direct current system main circuit, cooperation and control
More stringent requirements are proposed for the performance of device processed.Therefore flexible direct current line fault, fault restriction impact electricity how rapidly to be identified
Stream, is at flexible DC transmission line fault to reduce damage of the fault current to change of current device, route itself and system
Reason and protection facing challenges.
Currently, MMC-HVDC (modular multilevel converter type direct current transmission) system research is mostly used in Fault Control management
In terms of fault characteristic, and, event suitable for Traditional DC transmission of electricity less about the detection method that DC line breaks down
Hinder the unsuitable MMC-HVDC system of detection method such as border detection and traveling wave method etc., main cause is MMC inverter output wave
Form quality amount is high, has lacked DC filter and the equilateral boundary's condition of smoothing reactor；Although traveling-wave protection protection act speed is fast,
It is more demanding to the sample rate of equipment, and is easy to be bothered malfunction by noise, lightning stroke etc..
Therefore, for MMC-HVDC system, how DC side line fault is reliably detected, becomes art technology
Personnel's urgent problem to be solved.
Summary of the invention
This application provides a kind of flexible direct current circuitry fault detection methods and device can for MMC-HVDC system
Reliable detection DC line fault.
On the one hand, this application provides a kind of flexible direct current circuitry fault detection methods, comprising:
Obtain each submodule average capacitor voltage of any phase upper and lower bridge arm of flexible direct current route two sides converter station；
According to the relationship of the upper and lower bridge arm each submodule average capacitor voltage and rated capacity voltage, DC line is judged
The type of failure, the fault type include monopolar grounding fault and interpolar failure.
With reference to first aspect, the first in first aspect can be in realization mode, acquisition flexible direct current route two sides
The step of each submodule average capacitor voltage of any phase upper and lower bridge arm of converter station further include:
The voltage signal and current signal of acquisition protection location in real time；
Calculate voltage derivative value and current differential value；
Judge whether voltage derivative value and current differential value exceed corresponding given threshold；
If voltage derivative value and current differential value exceed corresponding given threshold, obtains flexible direct current route two sides and change
Any each submodule average capacitor voltage of phase upper and lower bridge arm in stream station.
With reference to first aspect, in second of achievable mode of first aspect, according to each submodule of the upper and lower bridge arm
The relationship of average capacitor voltage and rated capacity voltage, the step of judging the type of DC line fault further include:
According to the polarity of the upper and lower bridge arm each submodule average capacitor voltage and the rated capacity voltage deviation amount, sentence
Disconnected DC line breaks down cathode ground fault or plus earth failure；
By judging the variation tendency of upper bridge arm and each submodule average capacitor voltage of lower bridge arm, DC line fault is judged
It whether is interpolar failure.
The achievable mode of second with reference to first aspect, the third in first aspect can be in realization mode, and described
According to the polarity of the upper and lower bridge arm each submodule average capacitor voltage and the rated capacity voltage deviation amount, DC line is judged
The step of cathode ground fault that breaks down or plus earth failure includes:
If each submodule average capacitor voltage of upper bridge arm is higher than the submodule rated capacity voltage, while described
Each submodule average capacitor voltage of lower bridge arm is lower than the submodule rated capacity voltage, then judges that DC line fault is cathode
Ground fault；
If each submodule average capacitor voltage of upper bridge arm is lower than the submodule rated capacity voltage, while described
Each submodule average capacitor voltage of lower bridge arm is higher than the submodule rated capacity voltage, then judges that DC line fault is anode
Ground fault.
The achievable mode of second with reference to first aspect, it is described logical in the 4th kind of achievable mode of first aspect
The variation tendency for judging upper bridge arm and each submodule average capacitor voltage of lower bridge arm is crossed, judges whether DC line fault is interpolar
The step of failure includes:
If there is Voltage Drop and each submodule of the lower bridge arm in each submodule average capacitor voltage of upper bridge arm
There is Voltage Drop simultaneously in average capacitor voltage, then judges that DC line fault is interpolar failure.
Second aspect, present invention also provides a kind of flexible direct current line fault testing devices, comprising:
Voltage obtains module, average for obtaining any each submodule of phase upper and lower bridge arm of flexible direct current route two sides converter station
Capacitance voltage；
Breakdown judge module, for according to each submodule average capacitor voltage of the upper and lower bridge arm and rated capacity voltage
Relationship, judges the type of DC line fault, and the fault type includes monopolar grounding fault and interpolar failure.
In conjunction with second aspect, the first in second aspect can be in realization mode, and the voltage obtains module and includes:
Signal acquisition unit, for acquiring the voltage signal and current signal of protection location in real time；
Computing unit, for calculating voltage derivative value and current differential value；
Judging unit, for judging whether voltage derivative value and current differential value exceed corresponding given threshold；If electric
It presses differential value and current differential value to exceed corresponding given threshold, then obtains any phase of DC line two sides flexible direct current converter station
Each submodule average capacitor voltage of upper and lower bridge arm.
In conjunction with second aspect, in second of achievable mode of second aspect, the breakdown judge module is also used to: root
According to the polarity of the upper and lower bridge arm each submodule average capacitor voltage and the rated capacity voltage deviation amount, DC line is judged
The cathode ground fault that breaks down or plus earth failure；By judging upper bridge arm and the average electricity of each submodule of lower bridge arm
The variation tendency for holding voltage, judges whether DC line fault is interpolar failure.
In conjunction with second of achievable mode of second aspect, in second aspect, the third can be in realization mode, the failure
Judgment module is also used to: if each submodule average capacitor voltage of the upper bridge arm is higher than the submodule rated capacity voltage,
Each submodule average capacitor voltage of lower bridge arm is lower than the submodule rated capacity voltage simultaneously, then judges DC line event
Barrier is cathode ground fault；If each submodule average capacitor voltage of upper bridge arm is lower than the submodule rated capacity electricity
Pressure, while each submodule average capacitor voltage of the lower bridge arm is higher than the submodule rated capacity voltage, then judges AC line
Road failure is plus earth failure.
In conjunction with second of achievable mode of second aspect, in the 4th kind of achievable mode of second aspect, the failure
Judgment module is also used to: if Voltage Drop and the lower bridge arm occurs in each submodule average capacitor voltage of the upper bridge arm
There is Voltage Drop simultaneously in each submodule average capacitor voltage, then judges that DC line fault is interpolar failure.
From the above technical scheme, this application provides a kind of flexible direct current circuitry fault detection method and device, packets
It includes: obtaining each submodule average capacitor voltage of any phase upper and lower bridge arm of flexible direct current route two sides converter station；According to upper and lower bridge arm
The relationship of each submodule average capacitor voltage and rated capacity voltage judges the type of DC line fault.The technology of the application
Scheme can judge whether DC line occurs monopolar grounding fault or pole by the information of converter station internal capacitance voltage
Between failure.For the program by analyzing fault loop, principle is relatively simple, and testing result is reliable, and implementation process is to equipment
Quantitative requirement is less, while requiring equipment sample rate lower.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, attached drawing needed in case study on implementation will be made below
Simply introduce, it should be apparent that, for those of ordinary skills, in the premise of not making the creative labor property
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of flow chart of flexible direct current circuitry fault detection method provided by the embodiments of the present application；
Fig. 2 is the flow chart provided by the embodiments of the present application for obtaining capacitance voltage；
Fig. 3 is that discharge path schematic diagram after ground fault occurs for negative electrode bus provided by the embodiments of the present application；
Fig. 4 is the flow chart of the type of judgement DC line fault provided by the embodiments of the present application；
Fig. 5 is a kind of structural block diagram of flexible direct current line fault testing device provided by the embodiments of the present application.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with attached drawing, it is right
Technical solution in the embodiment of the present application is clearly and completely described.
Now the principles of science based on the application is described as follows: MMC-HVDC system converter station is able to carry out active and nothing
The independent control of function, general inverter side is in order to maintain the constant active amount of the voltage of DC line using the controlling party for determining DC voltage
Formula.System failure characteristic and system earth mode are closely related, be divided into DC side ground connection with exchange flank ground two kinds, direct current flanks
Ground needs the clamp resistance with two big resistance value, and which will cause biggish active loss, and exchange can be divided into connection with flanking
Knot transformer neutral point is grounded and is grounded by star reactor；General transformer voltage on line side grade is high, it is desirable that neutral point is straight
Ground connection, valve side winding use star connection reactor to constitute the resistance grounded again of auxiliary earth neutral point without neutral point, this
Such earthing mode is used in the scheme of application.In addition, the detection method and device in the application are all based on converter station capacitor
Information of voltage.
Fig. 1 is a kind of flow chart of flexible direct current circuitry fault detection method provided by the embodiments of the present application, such as Fig. 1 institute
Show, circuitry fault detection method includes:
S101 obtains each submodule average capacitor voltage of any phase upper and lower bridge arm of flexible direct current route two sides converter station.For
Convenience can only measure a 1-2 capacitance voltage respectively in upper and lower bridge arm, because submodule is not in the case where pressure algorithm acts on
Disconnected switching rotation carries out charge and discharge with impartial probability.
S102, according to the relationship of the upper and lower bridge arm each submodule average capacitor voltage and rated capacity voltage, judgement is straight
The type of Flow Line failure, the fault type include monopolar grounding fault and interpolar failure.Monopolar grounding fault will lead to event
Hinder the decline of bridge arm capacitance voltage, while side MMC inverter control DC line voltage across poles is constant, therefore non-faulting bridge arm capacitor electricity
Pressure rises, and leads to the imbalance of upper and lower bridge arm capacitance voltage, it is possible to pass through the upper and lower bridge arm average capacitor voltage of converter station
To carry out breakdown judge.
Fig. 2 is the flow chart that the embodiment of the present application obtains capacitance voltage, as shown in Fig. 2, obtaining flexible direct current route two sides
The step of each submodule average capacitor voltage of any phase upper and lower bridge arm of converter station includes:
S201 acquires the voltage signal and current signal of protection location in real time.
S202 calculates voltage derivative value and current differential value.
S203, judges whether voltage derivative value and current differential value exceed corresponding given threshold.
S204 obtains flexible direct current route if voltage derivative value and current differential value exceed corresponding given threshold
Each submodule average capacitor voltage of any phase upper and lower bridge arm of two sides converter station.
The application by negative electrode bus occur ground fault for be specifically described, discharge path as shown in figure 3, its
In, it is respectively I that the discharge current of ground resistance is flowed through at each end0_1And I0_2, IfaultFor the fault current of fault point, fault ground electricity
Resistance is Rf, under fault condition, DC voltage is kept constant under the effect of constant DC voltage control device, then its positive and negative electrode bus
Voltage is respectively as follows: with fault current
Wherein: UdcpAnd UdcnRespectively positive and negative electrode DC bus voltage-to-ground.It is hereafter research pair with single converter station
As analyzing the discharge current and submodule capacitor voltage for flowing through each converter station ground resistance after negative electrode bus ground fault occurs
Changing rule.Assuming that submodule switching frequency is infinitely great, and under capacitor voltage equalizing control, each submodule capacitor electricity of any moment bridge arm
Press average switch function that is identical, and defining lower bridge arm at this time are as follows:
Wherein: San、Sbn、ScnRespectively a, b, c three-phase lower bridge arm average switch function；M is modulation ratio.According to KVL, suddenly
Resistance and reactance (general line impedance is much smaller than ground resistance and earthing reactance) slightly on DC line, the outlet of inverter three-phase
Busbar voltage uj_ac(j=a, b, c) may be expressed as:
Wherein: N is single bridge arm submodule number, ucnFor lower bridge arm capacitance voltage average value.It can be obtained by formula (3):
Wherein R is ground resistance, IdcIt can be approximately constant for DC bus current at this time.
It can be obtained by formula (4):
Three-phase bus voltage may be expressed as: after failure
Wherein UacThe virtual value of bus phase voltage is exported for inverter.The direct current of electric current and voltage point in consideration inverter
Amount and fundamental component then according to Circuit theory when analyzing upper and lower bridge arm power, can consider dc component power and fundamental frequency respectively
Component power is added again can obtain bridge arm mean power.The fundamental component power P of the upper and lower bridge arm of three-phase is analyzed respectivelyp_ac、Pn_ac
With dc component power Pp_dc、Pn_dc(ignoring submodule capacitor voltage fluctuation), it is respectively as follows:
The then power P of the upper and lower bridge arm of three-phasepAnd PnIt is respectively as follows:
Total energy storage of the upper and lower bridge arm capacitor of three-phase again are as follows:
The upper and lower bridge arm power of three-phase can be obtained are as follows:
If ucp+ucn≈2uc(ucFor rated capacity voltage), joint type (9) and (11) can obtain:
Formula (5) and (12) are to reflect the discharge current and lower bridge in each terminal grounding resistance after monopolar grounding fault occurs
The mathematical model of arm capacitance voltage relationship.Connection both ends can must solve the differential side of discharge current Yu capacitance voltage changing rule
Journey group.
Fig. 4 is the flow chart of the type of judgement DC line fault provided by the embodiments of the present application, as shown in figure 4, according to
The relationship of upper and lower bridge arm each the submodule average capacitor voltage and rated capacity voltage, judges the type of DC line fault
Step further include:
S401, according to the pole of the upper and lower bridge arm each submodule average capacitor voltage and the rated capacity voltage deviation amount
Property judges that DC line breaks down cathode ground fault or plus earth failure.
S402 judges AC line by judging the variation tendency of upper bridge arm and each submodule average capacitor voltage of lower bridge arm
Whether road failure is interpolar failure.
In the embodiment of the present application, described according to each submodule average capacitor voltage of the upper and lower bridge arm and the specified electricity
Hold voltage deviation amount polarity, judge DC line break down cathode ground fault or plus earth failure the step of
Include:
If each submodule average capacitor voltage of upper bridge arm is higher than the submodule rated capacity voltage, while described
Each submodule average capacitor voltage of lower bridge arm is lower than the submodule rated capacity voltage, then judges that DC line fault is cathode
Ground fault.
If each submodule average capacitor voltage of upper bridge arm is lower than the submodule rated capacity voltage, while described
Each submodule average capacitor voltage of lower bridge arm is higher than the submodule rated capacity voltage, then judges that DC line fault is anode
Ground fault.
In addition, if each submodule average capacitor voltage of the upper bridge arm Voltage Drop occurs and the lower bridge arm is each
There is Voltage Drop simultaneously in submodule average capacitor voltage, then judges that DC line fault is interpolar failure.
Fig. 5 is a kind of structural block diagram of line fault testing device provided by the embodiments of the present application, as shown in figure 5, route
Fault detection means includes: that voltage obtains module 51, for obtaining any phase upper and lower bridge arm of flexible direct current route two sides converter station
Each submodule average capacitor voltage；Breakdown judge module 52, for according to each submodule average capacitor voltage of the upper and lower bridge arm
With the relationship of rated capacity voltage, the type of DC line fault is judged, the fault type includes monopolar grounding fault and pole
Between failure.
Optionally, it includes: signal acquisition unit that the voltage, which obtains module, and the voltage for acquiring protection location in real time is believed
Number and current signal；Computing unit, for calculating voltage derivative value and current differential value；Judging unit, for judging that voltage is micro-
Whether score value and current differential value exceed corresponding given threshold；It is set accordingly if voltage derivative value and current differential value exceed
Determine threshold value, then obtains each submodule average capacitor voltage of any phase upper and lower bridge arm of flexible direct current route two sides converter station.
Optionally, the breakdown judge module is also used to: according to each submodule average capacitor voltage of the upper and lower bridge arm with
The polarity of the rated capacity voltage deviation amount judges that DC line breaks down cathode ground fault or plus earth
Failure；By judging the variation tendency of upper bridge arm and each submodule average capacitor voltage of lower bridge arm, judge that DC line fault is
No is interpolar failure.
Optionally, the breakdown judge module is also used to: if each submodule average capacitor voltage of the upper bridge arm is higher than
The submodule rated capacity voltage, while each submodule average capacitor voltage of the lower bridge arm is lower than the specified electricity of the submodule
Hold voltage, then judges that DC line fault is cathode ground fault；If each submodule average capacitor voltage of upper bridge arm is low
In the submodule rated capacity voltage, while each submodule average capacitor voltage of the lower bridge arm is specified higher than the submodule
Capacitance voltage then judges that DC line fault is plus earth failure.
Optionally, the breakdown judge module is also used to: if each submodule average capacitor voltage of the upper bridge arm occurs
There is Voltage Drop simultaneously in Voltage Drop and each submodule average capacitor voltage of the lower bridge arm, then judge DC line event
Barrier is interpolar failure.
As it can be seen from the above scheme the embodiment of the present application provides a kind of flexible direct current circuitry fault detection method and device,
It include: to obtain each submodule average capacitor voltage of any phase upper and lower bridge arm of flexible direct current route two sides converter station；According to upper and lower bridge
The relationship of each submodule average capacitor voltage of arm and rated capacity voltage judges the type of DC line fault.The skill of the application
Art scheme can judge whether DC line occurs monopolar grounding fault still by the information of converter station internal capacitance voltage
Interpolar failure.For the program by analyzing fault loop, principle is relatively simple, and testing result is reliable, and implementation process is to setting
Standby quantitative requirement is less, while requiring equipment sample rate lower.
Those skilled in the art will readily occur to its of the application after considering specification and practicing application disclosed herein
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the application, these modifications, purposes or
Person's adaptive change follows the general principle of the application and including the undocumented common knowledge in the art of the application
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the application are by following
Claim is pointed out.
It should be understood that the application is not limited to the precise structure that has been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.Scope of the present application is only limited by the accompanying claims.
Claims (10)
1. a kind of flexible direct current circuitry fault detection method characterized by comprising
Obtain each submodule average capacitor voltage of any phase upper and lower bridge arm of flexible direct current route two sides converter station；
According to the relationship of the upper and lower bridge arm each submodule average capacitor voltage and rated capacity voltage, DC line fault is judged
Type, the fault type includes monopolar grounding fault and interpolar failure.
2. the method according to claim 1, wherein any phase of acquisition flexible direct current route two sides converter station
The step of each submodule average capacitor voltage of upper and lower bridge arm further include:
The voltage signal and current signal of acquisition protection location in real time；
Calculate voltage derivative value and current differential value；
Judge whether voltage derivative value and current differential value exceed corresponding given threshold；
If voltage derivative value and current differential value exceed corresponding given threshold, flexible direct current route two sides converter station is obtained
Any each submodule average capacitor voltage of phase upper and lower bridge arm.
3. the method according to claim 1, wherein according to each submodule average capacitor voltage of the upper and lower bridge arm
With the relationship of rated capacity voltage, the step of judging the type of DC line fault further include:
According to the polarity of the upper and lower bridge arm each submodule average capacitor voltage and the rated capacity voltage deviation amount, judgement is straight
Flow Line breaks down cathode ground fault or plus earth failure；
By judging the variation tendency of upper bridge arm and each submodule average capacitor voltage of lower bridge arm, whether DC line fault is judged
It is interpolar failure.
4. according to the method described in claim 3, it is characterized in that, described according to each submodule average capacitance of the upper and lower bridge arm
The polarity of voltage and the rated capacity voltage deviation amount judges that DC line breaks down cathode ground fault or just
The step of pole ground fault includes:
If each submodule average capacitor voltage of upper bridge arm is higher than the submodule rated capacity voltage, while the lower bridge
Each submodule average capacitor voltage of arm is lower than the submodule rated capacity voltage, then judges that DC line fault is cathode ground connection
Failure；
If each submodule average capacitor voltage of upper bridge arm is lower than the submodule rated capacity voltage, while the lower bridge
Each submodule average capacitor voltage of arm is higher than the submodule rated capacity voltage, then judges that DC line fault is plus earth
Failure.
5. according to the method described in claim 3, it is characterized in that, described by judging that upper bridge arm and each submodule of lower bridge arm are flat
The variation tendency of equal capacitance voltage, judges that the step of whether DC line fault is interpolar failure includes:
If there is Voltage Drop in each submodule average capacitor voltage of upper bridge arm and each submodule of the lower bridge arm is average
There is Voltage Drop simultaneously in capacitance voltage, then judges that DC line fault is interpolar failure.
6. a kind of flexible direct current line fault testing device characterized by comprising
Voltage obtains module, for obtaining each submodule average capacitance of any phase upper and lower bridge arm of flexible direct current route two sides converter station
Voltage；
Breakdown judge module, for the pass according to the upper and lower bridge arm each submodule average capacitor voltage and rated capacity voltage
System, judges the type of DC line fault, the fault type includes monopolar grounding fault and interpolar failure.
7. device according to claim 6, which is characterized in that the voltage obtains module and includes:
Signal acquisition unit, for acquiring the voltage signal and current signal of protection location in real time；
Computing unit, for calculating voltage derivative value and current differential value；
Judging unit, for judging whether voltage derivative value and current differential value exceed corresponding given threshold；If voltage is micro-
Score value and current differential value exceed corresponding given threshold, then obtain any phase upper and lower bridge arm of flexible direct current route two sides converter station
Each submodule average capacitor voltage.
8. device according to claim 6, which is characterized in that the breakdown judge module is also used to: above and below described
The polarity of bridge arm each submodule average capacitor voltage and the rated capacity voltage deviation amount, judges that DC line is broken down
It is cathode ground fault or plus earth failure；By the change for judging upper bridge arm and each submodule average capacitor voltage of lower bridge arm
Change trend judges whether DC line fault is interpolar failure.
9. device according to claim 8, which is characterized in that the breakdown judge module is also used to: if the upper bridge
Each submodule average capacitor voltage of arm is higher than the submodule rated capacity voltage, while the average electricity of each submodule of the lower bridge arm
Hold voltage and be lower than the submodule rated capacity voltage, then judges that DC line fault is cathode ground fault；If on described
Each submodule average capacitor voltage of bridge arm is lower than the submodule rated capacity voltage, while each submodule of the lower bridge arm is average
Capacitance voltage is higher than the submodule rated capacity voltage, then judges that DC line fault is plus earth failure.
10. device according to claim 8, which is characterized in that the breakdown judge module is also used to: if the upper bridge
There is Voltage Drop and each submodule average capacitor voltage of the lower bridge arm while occurring in each submodule average capacitor voltage of arm
Voltage Drop then judges that DC line fault is interpolar failure.
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| CN110794258A (en) * | 2019-10-28 | 2020-02-14 | 江苏能电科技有限公司 | Electric circuit sparking detection method, device, equipment and storage medium |
| CN111693898A (en) * | 2020-05-18 | 2020-09-22 | 西安交通大学 | Accelerated positioning method for IGBT open-circuit fault in modular multilevel converter |
| CN113281678A (en) * | 2021-04-12 | 2021-08-20 | 西安理工大学 | Method for positioning open-circuit fault of tubes on half-bridge submodule of modular multilevel converter |
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| 常冀闫: "500kV统一潮流控制器电磁暂态建模与故障过电压仿真研究", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅱ辑》 * |
| 赵成勇等: "MMC-HVDC 直流单极接地故障分析与换流站故障恢复策略", 《中国电机工程学报》 * |
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| CN110794258A (en) * | 2019-10-28 | 2020-02-14 | 江苏能电科技有限公司 | Electric circuit sparking detection method, device, equipment and storage medium |
| CN110794258B (en) * | 2019-10-28 | 2022-05-06 | 江苏能电科技有限公司 | Electric circuit sparking detection method, device, equipment and storage medium |
| CN111693898A (en) * | 2020-05-18 | 2020-09-22 | 西安交通大学 | Accelerated positioning method for IGBT open-circuit fault in modular multilevel converter |
| CN111693898B (en) * | 2020-05-18 | 2021-08-13 | 西安交通大学 | Accelerated positioning method for IGBT open-circuit fault in modular multilevel converter |
| CN113281678A (en) * | 2021-04-12 | 2021-08-20 | 西安理工大学 | Method for positioning open-circuit fault of tubes on half-bridge submodule of modular multilevel converter |
| CN113281678B (en) * | 2021-04-12 | 2022-11-08 | 西安理工大学 | Method for positioning open-circuit fault of tubes on half-bridge submodule of modular multilevel converter |
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Application publication date: 20190719 |