CN107490749A - The fault detection method and device of extra-high voltage flexible direct current power transmission system starting-up later time - Google Patents
The fault detection method and device of extra-high voltage flexible direct current power transmission system starting-up later time Download PDFInfo
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- CN107490749A CN107490749A CN201710828857.6A CN201710828857A CN107490749A CN 107490749 A CN107490749 A CN 107490749A CN 201710828857 A CN201710828857 A CN 201710828857A CN 107490749 A CN107490749 A CN 107490749A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The embodiment of the present invention provides a kind of fault detection method and device of extra-high voltage flexible direct current power transmission system starting-up later time, the failure of the starting-up later time of charge circuit in extra-high voltage flexible direct current power transmission system accurately can be detected, the device includes：First current measurement module is used to measure the first current value between the output end of AC network and first switch；Second current measurement module is used to measure the second current value started between resistance and first node；3rd current measurement module is used to measure the 3rd current value between the input of tietransformer and valve；Voltage measurement module is used to measure the three-phase voltage value between section point and earth terminal；Processing module connects above-mentioned modules to obtain the first current value, the second current value, the 3rd current value and three-phase voltage value, and failure mode when judging that starting-up later time breaks down according to the first current value, the second current value, three-phase voltage value and the 3rd current value, and corresponding warning information is sent, while control charge circuit to be stopped.
Description
Technical field
The present invention relates to extra-high voltage flexible direct-current transmission field, more particularly to a kind of extra-high voltage flexible direct current power transmission system to open
The fault detection method and device in dynamic loop.
Background technology
At present, Technology of HVDC based Voltage Source Converter can realize the only of active power and reactive power compared with customary DC is transmitted electricity
Vertical control, and line commutation voltage support is not needed, it can be powered to passive system, it uses wholly-controled device, transient voltage
The problem of transient process is not in commutation failure such as fall, there is obvious technical advantage.It is and soft in extra-high voltage among these
Property direct current (abbreviation extra-high voltage soft straight) technology of transmission of electricity can at a distance, large capacity transmission, improvement receiving end multi-infeed DC problem carries
The stability of high power network, already receive increasing research and application.Because the soft straight valve portion of extra-high voltage includes largely
Storage capacitor, so its enter steady operation mode before, line precharge need to be entered to capacitor.If it is direct to be not added with current limiting measures
Charging, larger dash current and surge voltage may be produced on each capacitor, easily causes security incident, therefore generally
The very big startup resistance (such as 5000 Europe) of a resistance is concatenated in charge circuit, is charged by starting resistance to soft straight valve,
After charging terminates, startup resistance is bypassed and exited, starts the close exchange that resistance may be provided at tietransformer as needed
The valve side of the net side of power network or close valve portion.
Shown in reference picture 1, the charge circuit in general flexible DC power transmission (voltage class ± 350KV) system at present
In, start the valve side that resistance R is provided in tietransformer 11, be referred to as starting wherein starting resistance R and switch S2 parts
Loop, since it is considered that the particularity of power transmission electric network, once processing not in time of breaking down can cause very big failure, it is described such as
, it is necessary to which some positions in the charge circuit shown in Fig. 1 are increased with some current transformers and voltage transformer shown in Fig. 2
The curtage of different places is measured, then judges the charge circuit with the presence or absence of event according to each measurement result
Barrier；Extra-high voltage flexible direct current power transmission system for being different from flexible direct current power transmission system, because the very high (voltage of its voltage class
Grade ± 800KV), and the manufacture craft of current tietransformer is horizontal limited, so the connection transformation of voltage levels
Device is not suitable for outdoor arrangement, need to take the form of wall bushing, now if starting-up later time setting also is come into tietransformer
If valve side, it can only be arranged among the valve Room where valve portion, and because it is very big in itself to start resistance, this can be very big
Ground occupies the space of valve portion, in order to just ensure that later period maintenance then needs the expansion valve Room to be all disposed within starting-up later time and valve
The valve Room, but great cost input can be so caused, so needing to reduce valve Room area, the institute of reference picture 3 to reduce cost
Resistance will be started by showing in the charge circuit of extra-high voltage flexible direct current power transmission system is positioned over tietransformer net side, because starting
The position in loop generates change also cannot be directly by the curtage transformer of the fault detect of starting-up later time in Fig. 2
Configuration theory is applied to as in the extra-high voltage flexible direct current power transmission system in Fig. 3, such as in original configuration theory, for close
The net side failure of AC system all can judge whether to break down using the electric current of electromagnetic current transducer detection net side, but
The net side for being typically all uses electromagnetic current transducer, and in figure 3 in charge circuit charging process, start resistance net side electricity
Stream very little only has several peaces, and when earth fault occurs in startup resistance valve side, starting resistance current on line side also only has dozens of Ann, such as
Fruit configures the electromagnetic current transducer of dozens of Ann range, can there is that measurement accuracy under low current is inadequate to ask in normal operation
Topic, if configuring the electromagnetic current transducer of several peaces, there can be transformer in failure again and move steady problem, excessive failure electricity
Stream results even in transformer explosion.So (starting-up later time is close to valve for three class failures being likely to occur for starting-up later time in Fig. 3
Partial valve side is broken down, the startup resistance in net side failure and starting-up later time of the starting-up later time close to AC network
Itself breaks down) need to reset fault detect configuration.
The content of the invention
Embodiments of the invention provide a kind of fault detection method of extra-high voltage flexible direct current power transmission system starting-up later time and
Device, can be to extra-high applied to the fault detect of the starting-up later time in the charge circuit of extra-high voltage flexible direct current power transmission system
The failure of starting-up later time accurately detects in pressure flexible direct current power transmission system.
To reach above-mentioned purpose, embodiments of the invention adopt the following technical scheme that：
First aspect, there is provided a kind of failure detector, returned applied to the charging in extra-high voltage flexible direct current power transmission system
The starting-up later time on road, the charge circuit include：First switch, second switch, start resistance, tietransformer and valve；Wherein, hand over
The output end of stream power network connects first node by first switch；First node connects section point by second switch, starts
Resistance is in parallel with second switch；Section point is connected to the input of valve, the first end of tietransformer by tietransformer
It is grounded with the second end；The failure detector includes：Processing module, the first current measurement module, the second current measurement module,
Three current measurement modules and voltage measurement module；
First current measurement module is arranged between the output end of AC network and first switch, for detecting the first electric current
Value；Second current measurement module, which is arranged at, to be started between resistance and first node, for detecting the second current value；3rd electric current is surveyed
Amount module is arranged between tietransformer and the input of valve, for detecting the 3rd current value；Voltage measurement module is arranged at
Between section point and earth terminal, for detecting three-phase voltage value；
Processing module connection first switch, valve, the first current measurement module, the second current measurement module, the 3rd electric current are surveyed
Module and voltage measurement module are measured, for obtaining the first current value, the second current value, the 3rd current value and three-phase voltage value, and
Determine that starting-up later time occurs in charge circuit according to the first current value or the second current value, three-phase voltage value and the 3rd current value
Failure mode during failure simultaneously sends corresponding warning information, while controls that first switch is opened and valve is stopped, and starts
Loop includes starting resistance, second switch, first node and section point and its annexation.
Optionally, processing module is used for the difference for calculating the first current value and the 3rd current value；When the first current value and
When the difference of three current values is more than the first preset value, processing module determines that the failure that starting-up later time occurs in charge circuit is resistance
Net side failure simultaneously sends the first warning information.
Optionally, processing module is used to calculate the difference of the first current value and the 3rd current value and according to three-phase voltage value
The residual voltage value of section point is calculated, when the difference of the first current value and the 3rd current value is not above the first preset value, the
The residual voltage value that two current values are more than the second preset value and section point determines that starting-up later time occurs in charge circuit when being zero
Failure for charging resistor failure and send the second warning information.
Optionally, processing module is used to calculate the difference of the first current value and the 3rd current value and according to three-phase voltage value
The residual voltage value of section point is calculated, when the difference of the first current value and the 3rd current value is not above the first preset value, the
Two current values, which are more than when the second preset value and residual voltage value are not zero, determines that the failure that starting-up later time occurs in charge circuit is
Resistance valve side failure simultaneously sends the 3rd warning information.
Preferably, the first current measurement module and the 3rd current measurement module are electromagnetic current transducer, the second electric current
Measurement module is electronic current mutual inductor, and voltage measurement module is capacitance type potential transformer.
Optionally, warning information comprise at least it is following any one：Sound, light, electricity；Warning information, which includes the first alarm, to be believed
Breath, the second warning information and the 3rd warning information.
Second aspect, there is provided filled in a kind of flexible direct current power transmission system of the failure detector provided based on first aspect
The fault detection method of electrical circuit, including：
Obtain the first current value, the second current value, three-phase voltage value and the 3rd current value；
Determine to start back in charge circuit according to the first current value, the second current value, three-phase voltage value and the 3rd current value
Failure mode when road is broken down simultaneously sends corresponding warning information, while controls the first switch to open and the valve
It is stopped.
Optionally, determined according to the first current value, the second current value, three-phase voltage value and the 3rd current value in charge circuit
Failure mode when starting-up later time breaks down simultaneously sends corresponding warning information and included：
Calculate the difference of the first current value and the 3rd current value；When the difference of the first current value and the 3rd current value is more than
During one preset value, determine that the failure that starting-up later time occurs in charge circuit is resistance net side failure and sends the first warning information.
Optionally, determine that charge circuit goes out according to the first current value, the second current value, three-phase voltage value and the 3rd current value
Failure mode during existing failure simultaneously sends corresponding warning information and included：
Calculate the difference of the first current value and the 3rd current value；The residual voltage of section point is calculated according to three-phase voltage value
Value；When the difference of the first current value and the 3rd current value is more than the second preset value not less than the first preset value, the second current value
And the residual voltage value of section point determine when being zero starting-up later time occurs in charge circuit failure be charging resistor failure simultaneously
Send the second warning information.
Optionally, determined according to the first current value, the second current value, three-phase voltage value and the 3rd current value in charge circuit
Failure mode when starting-up later time breaks down simultaneously sends corresponding warning information and included：
Calculate the difference of the first current value and the 3rd current value；The residual voltage of section point is calculated according to three-phase voltage value
Value；When the difference of the first current value and the 3rd current value is more than the second preset value not less than the first preset value, the second current value
And residual voltage value determines starting-up later time occurs in charge circuit failure when being not zero as resistance valve side failure and sends the 3rd
Warning information.
The third aspect, there is provided a kind of extra-high voltage flexible direct current power transmission system, including charge circuit and first aspect provide
Failure detector.
The fault detect side of starting-up later time in kind extra-high voltage flexible direct current power transmission system provided in an embodiment of the present invention
Method and device, because the failure detector includes：Processing module, the first current measurement module, the second current measurement module,
Three current measurement modules and voltage measurement module；First current measurement module is arranged at the output end and first switch of AC network
Between, for detecting the first current value；Second current measurement module, which is arranged at, to be started between resistance and first node, for detecting
Second current value；3rd current measurement module is arranged between tietransformer and the input of valve, for detecting the 3rd electric current
Value；Voltage measurement module is arranged between section point and earth terminal, for detecting three-phase voltage value；Processing module connection first
Switch, valve, the first current measurement module, the second current measurement module, the 3rd current measurement module and voltage measurement module, are used for
Obtain the first current value, the second current value, the 3rd current value and three-phase voltage value, and according to the first current value, the second current value,
Three-phase voltage value and the 3rd current value determine failure mode when starting-up later time breaks down in charge circuit and sent corresponding
Warning information, while control the first switch opening and the valve to be stopped, starting-up later time includes starting resistance, second
Switch, first node and section point and its annexation composition.So in the charging to extra-high voltage flexible direct current power transmission system
, can be by the way that the current measurement module in failure detector and voltage measurement module be set when failure in loop is detected
The ad-hoc location in the charge circuit of extra-high voltage flexible direct current power transmission system is put, so as to obtain the output end of AC network and
The second current value between the first current value, first node between the first end of one switch and the first end for starting resistance, the
The 3rd current value between the three-phase voltage value of two nodes and the second end of tietransformer and the input of valve, and these electric currents
Whether all normally there are close ties in value and magnitude of voltage, then processing module can be with according to this with starting-up later time in charge circuit
A little current values and magnitude of voltage do respective handling and calculate all kinds of failure kinds for determining that starting-up later time is likely to occur in charge circuit later
Class simultaneously sends corresponding warning information to remind extra-high voltage flexible direct current power transmission system manager to carry out timely processing to failure,
The first switch opening and valve is controlled to be stopped to avoid failure from holding extra-high voltage flexible direct current power transmission system simultaneously
It is continuous to influence.Therefore, scheme provided in an embodiment of the present invention can in extra-high voltage flexible direct current power transmission system starting-up later time failure
Accurate detection, further it is also possible that fault impact is preferably minimized and is processed as soon as possible.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the charge circuit structural representation in a kind of flexible direct current power transmission system that prior art provides；
Fig. 2 is charge circuit fault detect configuration structure schematic diagram in Fig. 1；
Fig. 3 is the charge circuit structural representation in a kind of extra-high voltage flexible direct current power transmission system that prior art provides；
Fig. 4 is a kind of fault detect dress for being applied to starting-up later time in charge circuit in Fig. 3 provided in an embodiment of the present invention
Put structural representation；
Fig. 5 is a kind of failure detector setting structure schematic diagram that another embodiment of the present invention provides；
Fig. 6 is Fig. 5 complete structure schematic diagram；
Fig. 7 is a kind of fault detect side of extra-high voltage flexible direct current power transmission system starting-up later time provided in an embodiment of the present invention
Method schematic flow sheet；
Fig. 8 is a kind of failure inspection for extra-high voltage flexible direct current power transmission system starting-up later time that another embodiment of the present invention provides
Survey method flow schematic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
It should be noted that in the embodiment of the present invention, " exemplary " or " such as " etc. word make example, example for expression
Card or explanation.Be described as in the embodiment of the present invention " exemplary " or " such as " any embodiment or design should
It is interpreted than other embodiments or design more preferably or more advantage.Specifically, " exemplary " or " example are used
Such as " word is intended to that related notion is presented in a concrete fashion.
It should also be noted that, in the embodiment of the present invention, " (English：Of) ", " corresponding (English：
Corresponding, relevant) " and " corresponding (English：Corresponding) " can use with sometimes, it should be pointed out that
Be, when not emphasizing its difference, its is to be expressed be meant that it is consistent.
For the ease of clearly describing the technical scheme of the embodiment of the present invention, in an embodiment of the present invention, employ " the
One ", the printed words such as " second " make a distinction to function and the essentially identical identical entry of effect or similar item, and those skilled in the art can
To understand that the printed words such as " first ", " second " are not to be defined to quantity and execution order.
Because the failure detection schemes of the starting-up later time in the charge circuit of existing flexible direct current power transmission system can not
Apply and starting-up later time is being arranged in the extra-high voltage flexible direct current power transmission system of tietransformer net side, so needing to extra-high
The failure detection schemes of starting-up later time in the charge circuit of pressure flexible direct current power transmission system are redesigned extra-high to ensure
Press the accurate detection of the failure of the starting-up later time in the charge circuit of flexible direct current power transmission system.
In order to achieve the above object, the embodiment of the present invention provides a kind of extra-high voltage flexible direct current power transmission system, including one kind
For detecting the failure detector of starting-up later time failure in extra-high voltage flexible direct current power transmission system, shown in reference picture 4, the charging
Loop includes：First switch S1, second switch S2, start resistance R, tietransformer 42 and valve 43；Wherein, AC network 44
Output end passes through first switch S1 connection first nodes A；First node A starts electricity by second switch S2 connection section point B
It is in parallel with second switch S2 to hinder R；Section point B is connected to the input of valve 43, tietransformer 42 by tietransformer 42
First end and the second end ground connection；The failure detector 45 includes：Processing module 455, the first current measurement module 451,
Two current measurement modules 452, the 3rd current measurement module 453 and voltage measurement module 454；
First current measurement module 451 is arranged between the output end and first switch of AC network 44, for detecting the
One current value；Second current measurement module 452, which is arranged at, to be started between resistance and first node, for detecting the second current value；
3rd current measurement module 453 is arranged between tietransformer and the input of valve, for detecting the 3rd current value；Voltage is surveyed
Amount module 454 is arranged between section point and earth terminal, for detecting three-phase voltage value；
Processing module 455 connects first switch S1, valve 43, the first current measurement module 451, the second current measurement module
452nd, the 3rd current measurement module 453 and voltage measurement module 454, for obtaining the first current value, the second current value, the 3rd electricity
Flow valuve and three-phase voltage value, and charging is determined according to the first current value or the second current value, three-phase voltage value and the 3rd current value
In loop starting-up later time break down when failure mode and send corresponding warning information, while control first switch S1 open
And the valve 43 is stopped, starting-up later time 41 includes starting resistance R, second switch S2, first node A and section point B
And its annexation composition.
It should be noted that in Fig. 4 and it is not drawn into failure detector 45, wherein processing module 455, the first current measurement
Module 451, the second current measurement module 452, the 3rd current measurement module 453 and voltage measurement module 454 collectively constitute failure
Detection means 45；In addition, it is during failure mode of the processing module 455 when it is determined that starting-up later time 41 breaks down in charge circuit
Directly judge whether starting-up later time 41 breaks down, and event has also just been had determined that when judging that starting-up later time 41 breaks down
Hinder species, processing module 455 judge starting-up later time 41 failure after in order to ensure failure not long lasting effect charge circuit, no
The failure mode that pipe is judged is what can all go to control first switch S1 openings and valve 43 to be stopped, so that charging
Loop not formed loop also no longer by fault impact.
Failure detector provided in an embodiment of the present invention, because the failure detector includes：Processing module, the first electricity
Flow measurement module, the second current measurement module, the 3rd current measurement module and voltage measurement module；First current measurement module is set
It is placed between the output end of AC network and first switch, for detecting the first current value；Second current measurement module is arranged at
Start between resistance and first node, for detecting the second current value；3rd current measurement module be arranged at tietransformer with
Between the input of valve, for detecting the 3rd current value；Voltage measurement module is arranged between section point and earth terminal, is used for
Detect three-phase voltage value；Processing module connection first switch, valve, the first current measurement module, the second current measurement module, the 3rd
Current measurement module and voltage measurement module, for obtaining the first current value, the second current value, the 3rd current value and three-phase voltage
Value, and determine that starting-up later time goes out in charge circuit according to the first current value, the second current value, three-phase voltage value and the 3rd current value
Failure mode during existing failure simultaneously sends corresponding warning information, while controls that first switch is opened and valve is stopped, and opens
Dynamic loop includes starting resistance, second switch, first node and section point and its annexation composition.So to extra-high voltage
, can be by the way that the electric current in failure detector be surveyed when failure in the charge circuit of flexible direct current power transmission system is detected
Amount module and voltage measurement module are arranged on the ad-hoc location in the charge circuit of extra-high voltage flexible direct current power transmission system, so as to obtain
Take the first current value between the output end of AC network and the first end of first switch, first node and start the first of resistance
Between the three-phase voltage value of the second current value, section point and the second end of tietransformer and the input of valve between end
3rd current value, and close ties with starting-up later time in charge circuit all normally whether be present in these current values and magnitude of voltage, so
Post-processing module can be started back with doing respective handling according to these current values and magnitude of voltage and calculating in determination charge circuit later
All kinds of failure modes that road is likely to occur simultaneously send corresponding warning information to remind extra-high voltage flexible direct current power transmission system pipe
Reason person carries out timely processing to failure, while controls the first switch opening and valve to be stopped to avoid failure to extra-high
Press the long lasting effect of flexible direct current power transmission system.Therefore, scheme provided in an embodiment of the present invention can extra-high voltage flexible direct current it is defeated
The failure of starting-up later time accurately detects in electric system, further it is also possible that fault impact be preferably minimized and also as soon as possible by
Processing.
Optionally, processing module is used for the difference for calculating the first current value and the 3rd current value；When the first current value and
When the difference of three current values is more than the first preset value, processing module determines that the failure that starting-up later time occurs in charge circuit is resistance
Net side failure simultaneously sends the first warning information.
It is typically all because connection wire conduit is exhausted specifically, because when resistance net side failure occurs starting in starting-up later time
Earth fault caused by edge layer damage, now because the electric current of AC network output can cause the first current measurement with being directly entered
The first current value that module measures can be very big, and very little will also be become by starting electric current of the resistance close to the side of valve, so this
The 3rd electric current meeting very little of the current measurement modules of Shi tri- detection, and according to the error of actual capabilities appearance and to opening
The result of calculation of first current value of circuit during dynamic resistance net side failure can draw first preset value, when the first electric current
It is to start resistance net side to break down that value and the difference of the 3rd current value not can determine that when being not above the first preset value, when first
The detected value of other measurement modules need not be considered further that when the difference of current value and the 3rd current value is more than the first preset value
To determine that starting-up later time failure is exactly to start resistance net side failure in charge circuit.
Optionally, processing module is used to calculate the difference of the first current value and the 3rd current value and according to three-phase voltage value
The residual voltage value of section point is calculated, when the difference of the first current value and the 3rd current value is not above the first preset value, the
The residual voltage value that two current values are more than the second preset value and section point determines that starting-up later time occurs in charge circuit when being zero
Failure for charging resistor failure and send the second warning information.
Specifically, because failure caused by starting resistance is usually partial short circuit, starting the resistance of resistance can diminish, charging
Therefore the overall resistance value in loop also reduces, so now charge circuit is overall or connection, now the first current value and the
Three current values may occur difference because of the error of actually detected element but not belong to very much normal range (NR) greatly, thus first
Eliminate the idea that the error is determined according to the difference of the first current value and the 3rd current value；And now because charge circuit is overall
Resistance value also reduce, so now the second current measurement module detection the second current value can increase, can according to second electricity
The increase of flow valuve judges to be probably to start resistance there occurs failure, but also wants earth fault occur in startup resistance valve side
When is flowed into from the electric current of AC network output at fault ground, during compared to charge circuit normal work for, now second
Second current value of current measurement module detection can also increase, but now because startup resistance valve side there is earth fault
The three-phase voltage value of the section point of now voltage measurement module detection can be uneven because of ground connection, so that according to second
The residual voltage value for the section point that the three-phase voltage of node calculates can be not zero, so the residual voltage value according to section point
It is that zero can exclude to start resistance valve side and break down, described processing module can be in the difference of the first current value and the 3rd current value
Determined when value is not above the first preset value, the second current value is more than the second preset value and the residual voltage value of section point is zero
The failure that starting-up later time occurs in charge circuit is charging resistor failure, and the second preset value here starts resistance for statistics is actual
Fault current is integrated and drawn during failure.
Optionally, processing module is used to calculate the difference of the first current value and the 3rd current value and according to three-phase voltage value
The residual voltage value of section point is calculated, when the difference of the first current value and the 3rd current value is not above the first preset value, the
Two current values, which are more than when the second preset value and residual voltage value are not zero, determines that the failure that starting-up later time occurs in charge circuit is
Resistance valve side failure simultaneously sends the 3rd warning information.
Specifically, when starting-up later time occurs starting resistance valve side failure reason with start that resistance net side failure is similar is all
Because earth fault caused by the damage of connecting line pipe insulation layer, can expect according to the first current value and the 3rd current value first
Difference determine failure, but from electric current of the AC network at earth fault because the presence for starting resistance is still very big,
So while the first current value of now the first current measurement module detection and the 3rd electric current of the 3rd current measurement module detection
There is difference in value, but this is very little relative to the range of the first current measurement module and the 3rd current measurement module, fill
The first current value that the first current measurement module detects in electrical circuit course of normal operation all it is possible that larger fluctuation, this
Current ripple level may all be more than the difference of the first current value and the 3rd current value when starting resistance valve side failure, so row
Judge the idea of such failure except the difference according to the first current value and the 3rd current value；Determined by foregoing charging resistor failure
The analysis of method understands that the second current value can increase when starting-up later time occurs starting resistance valve side failure in charge circuit, second
The residual voltage of node is not zero, so processing module can be not above in the difference of the first current value and the 3rd current value
One preset value, the second current value are determined in charge circuit when being not zero more than the residual voltage value of the second preset value and section point
The failure that starting-up later time occurs is charging resistor failure.
Preferably, shown in reference picture 5, the first current measurement module 451 shown in Fig. 4 is CT, Fig. 4 in actual circuit
Shown in the 3rd current measurement module 453 be electromagnetic current transducer IacY in actual circuit, second shown in Fig. 4
Current measurement module 452 is electronic current mutual inductor IvC in actual circuit, and the voltage measurement module 454 shown in Fig. 4 exists
It is capacitance type potential transformer UacD in actual circuit；Figure is not carried out to processing module in Fig. 4 455 and its annexation in Fig. 5
Show, concrete condition can refer to actual annexation.
Specifically, because rely primarily on first when it is determined that starting-up later time occurs and starts resistance net side failure in charge circuit
The difference that the first current value and the 3rd measurement module of current measurement module detection detect the 3rd current value carrys out interpretation, and charges
The first electric current can be very big when loop occurs starting resistance net side failure, the 3rd current value meeting very little, it is not necessary to consider precision and amount
Journey, so the electromagnetism that the first current measurement module and the 3rd current measurement module are commonly used from flexible direct current power transmission system here
Formula current transformer；In charge circuit normal work, the second electric current very little of the second current measurement module detection only has 3-5A,
And when part short trouble occurs in itself for startup resistance, the second electric current might have tens A, but this transmits electricity relative to general
It is fairly small to be detected in system for the detection range of the electromagnetic current transducer of electric current, and electromagnetic current transducer
Measurement accuracy be also not enough to measure the difference of low current, so the second current measurement module is higher from precision herein, amount
The less electronic current mutual inductor of journey, according to actual conditions, the parameter that general electronic current mutual inductor is chosen is range
100A, precision 5/1000ths.
Optionally, warning information comprise at least it is following any one：Sound, light, electricity；Warning information, which includes the first alarm, to be believed
Breath, the second warning information and the 3rd warning information.
Specifically, extra-high voltage flexible direct current power transmission system manager or maintenance person receive the first warning information,
Any warning information or it can be gone to extra-high voltage flexible direct current during multiple warning information in second warning information and the 3rd warning information
The charge circuit of transmission system does corresponding repairing.
It is exemplary, in practice the charge circuit in extra-high voltage flexible direct current power transmission system not only only have it is above-mentioned it is several on
The failure of charging resistor, also miscellaneous part can have failure, so can also exist on charge circuit shown in reference picture 6 other
Current transformer or voltage transformer are used for the failure for detecting other charge circuits.
Shown in reference picture 7, it is flexible straight that the embodiment of the present invention also provides a kind of extra-high voltage based on above-mentioned failure detector
The fault detection method of the starting-up later time of charge circuit in transmission system is flowed, this method includes：
701st, the first current value, the second current value, three-phase voltage value and the 3rd current value are obtained.
Specifically, current value of first current value between the output end of AC network and the first end of first switch；The
Two current values are the current value between first node and the first end for starting resistance；Three-phase voltage value is the three-phase electricity of section point
Pressure value；Current value of 3rd current value between the second end of tietransformer and the input of valve.
702nd, determine that charge circuit occurs according to the first current value, the second current value, three-phase voltage value and the 3rd current value
Failure mode and send corresponding warning information, while control first switch open and valve be stopped.
The fault detection method of starting-up later time in flexible direct current power transmission system provided in an embodiment of the present invention, because this method
Including:Obtain the first current value, the second current value, three-phase voltage value and the 3rd current value；According to the first current value, the second electric current
Value, three-phase voltage value and the 3rd current value determine charge circuit occur failure mode and send corresponding warning information, simultaneously
Control first switch is opened and valve is stopped.Because between the output end of AC network and the first end of first switch
The second current value, the three-phase voltage value and connection of section point between the first end of one current value, first node and startup resistance
Whether the 3rd current value connect between the second end of transformer and the input of valve is all normally deposited with starting-up later time in charge circuit
Maintaining close ties with, then processing module can calculate determination charging later to do respective handling according to these current values and magnitude of voltage
Starting-up later time is likely to occur in loop all kinds of failure modes simultaneously send corresponding warning information, while control first switch to open
And valve is stopped.Therefore, scheme provided in an embodiment of the present invention can start back in extra-high voltage flexible direct current power transmission system
The failure on road accurately detects.
Shown in reference picture 8, the embodiment of the present invention also provides the failure of starting-up later time in another flexible direct current power transmission system
Detection method more enters one as the fault detection method of starting-up later time in the flexible direct current power transmission system provided above-described embodiment
The supplementary notes of step, this method include：
801st, the first current value, the second current value, three-phase voltage value and the 3rd current value are obtained.
802nd, calculate the difference of the first current value and the 3rd current value and calculate the zero of section point according to three-phase voltage value
Sequence voltage value；
8031st, when the difference of the first current value and the 3rd current value is more than the first preset value, determine to open in charge circuit
The failure that dynamic loop occurs is resistance net side failure and sends the first warning information, while controls first switch opening and valve to stop
Only work.
8032nd, when the difference of the first current value and the 3rd current value is more than the not less than the first preset value, the second current value
Determine that the failure that starting-up later time occurs in charge circuit is charging during two preset values and when the residual voltage value of section point is zero
Resistance Fault simultaneously sends the second warning information, while controls first switch opening and valve to be stopped.
8033rd, when the difference of the first current value and the 3rd current value is more than the not less than the first preset value, the second current value
Determine that the failure that starting-up later time occurs in charge circuit is resistance valve side failure during two preset values and when residual voltage value is not zero
And the 3rd warning information is sent, while control first switch opening and valve to be stopped.
In summary, in flexible direct current power transmission system provided in an embodiment of the present invention the fault detection method of starting-up later time and
Device, because the failure detector includes：Processing module, the first current measurement module, the second current measurement module, the 3rd electricity
Flow measurement module and voltage measurement module；First current measurement module be arranged at the output end of AC network and first switch it
Between, for detecting the first current value；Second current measurement module, which is arranged at, to be started between resistance and first node, for detecting the
Two current values；3rd current measurement module is arranged between tietransformer and the input of valve, for detecting the 3rd current value；
Voltage measurement module is arranged between section point and earth terminal, for detecting three-phase voltage value；The electricity of processing module connection first
Flow measurement module, the second current measurement module, the 3rd current measurement module and voltage measurement module, for obtaining the first electric current
Value, the second current value, the 3rd current value and three-phase voltage value, and according to the first current value, the second current value, three-phase voltage value and
3rd current value determines failure mode when starting-up later time in charge circuit breaks down and sends corresponding warning information, simultaneously
Control first switch is opened and valve is stopped, and starting-up later time includes starting resistance, second switch, first node and the second section
Point and its annexation composition.So the failure in the starting-up later time to extra-high voltage flexible direct current power transmission system detects
When, can be defeated by the way that the current measurement module in failure detector and voltage measurement module are arranged on into extra-high voltage flexible direct current
Ad-hoc location in the charge circuit of electric system, so as to obtain between the output end of AC network and the first end of first switch
First current value, first node and start resistance first end between the second current value, section point three-phase voltage value and
The 3rd current value between second end of tietransformer and the input of valve, and these current values and magnitude of voltage all with charge back
In road there are close ties in the whether normal of starting-up later time, and then processing module can be to do according to these current values and magnitude of voltage
Respective handling calculates all kinds of failure modes that starting-up later time is likely to occur in determination charge circuit later and sends corresponding alarm
Information controls described first to open to remind extra-high voltage flexible direct current power transmission system manager to carry out timely processing to failure
Close opening and valve is stopped to avoid long lasting effect of the failure to extra-high voltage flexible direct current power transmission system.Therefore, it is of the invention
The scheme that embodiment provides the failure of starting-up later time can be accurately detected in extra-high voltage flexible direct current power transmission system, it is further also
Fault impact can be caused to be preferably minimized and be processed as soon as possible.
The embodiment of the present invention also provides a kind of computer program, and the computer program can be loaded directly into memory, and
Containing software code, the computer program is loaded into via computer and can realize that above-mentioned extra-high voltage flexible direct current is defeated after performing
The fault detection method of starting-up later time in electric system.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in, all should
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (11)
- A kind of 1. failure detector, applied to the starting-up later time of the charge circuit in extra-high voltage flexible direct current power transmission system, institute Stating charge circuit includes：First switch, second switch, start resistance, tietransformer and valve；Wherein, the output of AC network End connects first node by the first switch；The first node connects section point by the second switch, described It is in parallel with the second switch to start resistance；The section point is connected to the input of the valve by the tietransformer End, the first end of the tietransformer and the second end ground connection；Characterized in that, the failure detector includes：Handle mould Block, the first current measurement module, the second current measurement module, the 3rd current measurement module and voltage measurement module；First current measurement module is arranged between the output end of the AC network and the first switch, for measuring First current value；Second current measurement module is arranged between the startup resistance and the first node, for measuring Second current value；3rd current measurement module is arranged between the input of the tietransformer and the valve, is used for Measure the 3rd current value；The voltage measurement module is arranged between the section point and earth terminal, for measuring three-phase electricity Pressure value；The processing module connects the first switch, the valve, first current measurement module, second current measurement Module, the 3rd current measurement module and the voltage measurement module, for obtaining first current value, second electricity Flow valuve, the 3rd current value and the three-phase voltage value, and according to first current value, the 3rd current value, described Second current value and the three-phase voltage value judge the failure mode and hair when starting-up later time breaks down in the charge circuit Go out corresponding warning information, while control the first switch opening and the valve to be stopped；The starting-up later time includes The startup resistance, the second switch, the first node and the section point and its annexation.
- 2. failure detector according to claim 1, it is characterised in thatThe processing module is used for the difference for calculating first current value and the 3rd current value；When first current value During with the difference of the 3rd current value more than the first preset value, the processing module determines starting-up later time in the charge circuit The failure of appearance is resistance net side failure and sends the first warning information.
- 3. failure detector according to claim 1, it is characterised in thatThe processing module is used to calculate the difference of first current value and the 3rd current value and according to the three-phase Magnitude of voltage calculates the residual voltage value of the section point, when the difference of first current value and the 3rd current value does not have It is more than more than the first preset value, second current value true when the residual voltage value of the second preset value and the section point is zero The failure that starting-up later time occurs in the fixed charge circuit is charging resistor failure and sends the second warning information.
- 4. failure detector according to claim 1, it is characterised in thatThe processing module is used to calculate the difference of first current value and the 3rd current value and according to the three-phase Magnitude of voltage calculates the residual voltage value of the section point, when the difference of first current value and the 3rd current value does not have It is more than more than the first preset value, second current value when the second preset value and the residual voltage value are not zero described in determining and fills The failure that starting-up later time occurs in electrical circuit is resistance valve side failure and sends the 3rd warning information.
- 5. failure detector according to claim 1, it is characterised in that first current measurement module and described Three current measurement modules are electromagnetic current transducer, and second current measurement module is electronic current mutual inductor, described Voltage measurement module is capacitance type potential transformer.
- 6. according to the failure detector described in claim any one of 1-5, it is characterised in that the warning information comprises at least Below any one：Sound, light, electricity；The warning information includes the first warning information, the second warning information and the 3rd alarm letter Breath.
- 7. opened in a kind of extra-high voltage flexible direct current power transmission system of the failure detector based on described in claim any one of 1-6 The fault detection method in dynamic loop, it is characterised in that including：Obtain first current value, second current value, the three-phase voltage value and the 3rd current value；According to determining first current value, second current value, the three-phase voltage value and the 3rd current value Failure mode when starting-up later time breaks down in charge circuit simultaneously sends corresponding warning information, while controls described first to open Close opening and the valve is stopped.
- 8. according to the method for claim 7, it is characterised in that described according to first current value, second electric current Value, the three-phase voltage value and the 3rd current value determine failure kind when starting-up later time breaks down in the charge circuit Class simultaneously sends corresponding warning information and included：Calculate the difference of first current value and the 3rd current value；When the difference of first current value and the 3rd current value is more than the first preset value, determine in the charge circuit The failure that starting-up later time occurs is resistance net side failure and sends the first warning information.
- 9. according to the method for claim 7, it is characterised in that described according to first current value, second electric current Value, the three-phase voltage value and the 3rd current value determine failure kind when starting-up later time breaks down in the charge circuit Class simultaneously sends corresponding warning information and included：Calculate the difference of first current value and the 3rd current value；Second section is calculated according to the three-phase voltage value The residual voltage value of point；When the difference of first current value and the 3rd current value is more than not less than the first preset value, second current value Determined during the second preset value and when the residual voltage value of the section point is zero in the charge circuit starting-up later time occur therefore Failure during barrier for charging resistor failure and sends the second warning information.
- 10. according to the method for claim 7, it is characterised in that described according to first current value, second electric current Value, the three-phase voltage value and the 3rd current value determine failure kind when starting-up later time breaks down in the charge circuit Class simultaneously sends corresponding warning information and included：Calculate the difference of first current value and the 3rd current value；Second section is calculated according to the three-phase voltage value The residual voltage value of point；When the difference of first current value and the 3rd current value is more than not less than the first preset value, second current value Determine that the failure that starting-up later time occurs in the charge circuit is electricity during the second preset value and when the residual voltage value is not zero Resistance valve side failure simultaneously sends the 3rd warning information.
- 11. a kind of extra-high voltage flexible direct current power transmission system, it is characterised in that including charge circuit and as claim 1-6 is any Failure detector described in.
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