CN107490749B - Fault detection method and device for starting loop of extra-high voltage flexible direct-current transmission system - Google Patents
Fault detection method and device for starting loop of extra-high voltage flexible direct-current transmission system Download PDFInfo
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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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- 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
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Abstract
The embodiment of the invention provides a fault detection method and a fault detection device for a starting circuit of an extra-high voltage flexible direct current transmission system, which can accurately detect the fault of the starting circuit of a charging circuit in the extra-high voltage flexible direct current transmission system, and the device comprises the following steps: the first current measuring module is used for measuring a first current value between the output end of the alternating current power grid and the first switch; the second current measuring module is used for measuring a second current value between the starting resistor and the first node; the third current measuring module is used for measuring a third current value between the connecting transformer and the input end of the valve; the voltage measuring module is used for measuring a three-phase voltage value between the second node and the grounding end; the processing module is connected with the modules to obtain a first current value, a second current value, a third current value and a three-phase voltage value, judges the fault type of the starting circuit when the starting circuit is in fault according to the first current value, the second current value, the three-phase voltage value and the third current value, sends corresponding alarm information and controls the charging circuit to stop working at the same time.
Description
Technical field
The present invention relates to extra-high voltage flexible direct-current transmission fields more particularly to a kind of extra-high voltage flexible HVDC transmission system to open
The fault detection method and device in dynamic circuit.
Background technique
Currently, flexible DC transmission technology compared with customary DC is transmitted electricity, is able to achieve the only of active power and reactive power
Vertical control, and line commutation voltage support is not needed, it can power to passive system, use wholly-controled device, transient voltage
The problem of transient processes are not in commutation failure such as fall, there is apparent technical advantage.And it is soft in extra-high voltage among these
Property direct current (abbreviation extra-high voltage soft straight) technology of transmission of electricity can remote, large capacity transmission, improve receiving end multi-infeed DC problem, mention
The stability of high power grid already receives more and more researchs and application.Since the soft straight valve portion of extra-high voltage includes a large amount of
Storage capacitor, so its enter steady operation mode before, capacitor need to be pre-charged.If it is direct that current limiting measures are not added
Charging, may generate biggish dash current and surge voltage on each capacitor, easily cause safety accident, therefore usually
The very big start-up resistor (such as 5000 Europe) of a resistance value is concatenated in charge circuit, is charged by start-up resistor to soft straight valve,
After charging, start-up resistor is bypassed and is exited, start-up resistor may be provided at the close exchange of tietransformer as needed
The valve side of the net side of power grid or close valve portion.
Charge circuit shown in referring to Fig.1, in current general flexible DC transmission (voltage class ± 350KV) system
In, start-up resistor R is the valve side that tietransformer 11 is arranged in, and wherein start-up resistor R and switch S2 component part are known as starting
Circuit, since it is considered that the particularity of power transmission electric network, once processing not in time of breaking down will cause very big failure, it is described such as
Shown in Fig. 2, needs to increase positions some in charge circuit shown in Fig. 1 some current transformers and voltage transformer comes
The current or voltage of different places is measured, is then judged the charge circuit with the presence or absence of event according to each measurement result
Barrier；For being different from the extra-high voltage flexible HVDC transmission system of flexible HVDC transmission system, because of 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, the form of wall bushing need to be taken, at this time if starting-up later time setting is also carried out tietransformer
If valve side, can only be arranged among the valve hall where valve portion, and because start-up resistor itself be it is very big, this can be very big
Ground occupies the space of valve portion, in order to just guarantee that later period maintenance then needs to expand valve hall and starting-up later time and valve can be made to be all disposed within
Valve hall, but will cause great cost input in this way, so needing to reduce valve hall area to reduce cost, referring to Fig. 3 institute
Show in the charge circuit of extra-high voltage flexible HVDC transmission system and start-up resistor is placed in tietransformer net side, because of starting
The position in circuit produces change also cannot be directly by the current or voltage mutual inductor of the fault detection of starting-up later time in Fig. 2
Configuration theory is applied to as in the extra-high voltage flexible HVDC transmission system in Fig. 3, such as in original configuration theory, for close
The net side failure of AC system can all use the electric current of electromagnetic current transducer detection net side to determine whether breaking down, but
The net side for being generally all uses electromagnetic current transducer, and in Fig. 3 in charge circuit charging process, start-up resistor net side electricity
Stream very little only has several peaces, and when ground fault occurs in start-up resistor valve side, start-up resistor current on line side also only has dozens of Ann, such as
Fruit configures the electromagnetic current transducer of dozens of Ann range, can ask when operating normally there are measurement accuracy under low current is inadequate
Topic if configuring the electromagnetic current transducer of several peaces, and can move steady problem there are mutual inductor in failure, excessive failure electricity
Stream results even in transformer explosion.So being directed to the three classes failure that starting-up later time is likely to occur in Fig. 3, (starting-up later time is close to valve
Start-up resistor in net side failure and starting-up later time of the partial failure of valve side, starting-up later time close to AC network
Itself breaks down) need to reset fault detection configuration.
Summary of the invention
The embodiment of the present invention provide a kind of extra-high voltage flexible HVDC transmission system starting-up later time fault detection method and
Device can be to extra-high applied to the fault detection of the starting-up later time in the charge circuit of extra-high voltage flexible HVDC transmission system
The failure of starting-up later time accurately detects in pressure flexible HVDC transmission system.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that
In a first aspect, providing a kind of fault detection means, returned applied to the charging in extra-high voltage flexible HVDC transmission system
The starting-up later time on road, the charge circuit include: first switch, second switch, start-up resistor, tietransformer and valve；Wherein, it hands over
The output end of galvanic electricity net connects first node by first switch；First node connects second node, starting by second switch
Resistance is in parallel with second switch；Second node is connected to the input terminal of valve, the first end of tietransformer by tietransformer
It is grounded with second end；The fault detection means 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 set between the output end of AC network and first switch, for detecting the first electric current
Value；Second current measurement module is set between start-up resistor and first node, for detecting the second current value；Third electric current is surveyed
Amount module is set between tietransformer and the input terminal of valve, for detecting third current value；Voltage measurement module is set to
Between second node and ground terminal, for detecting three-phase voltage value；
Processing module connects first switch, valve, the first current measurement module, the second current measurement module, third electric current and surveys
Module and voltage measurement module are measured, for obtaining the first current value, the second current value, third 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 third current value
Failure mode when failure simultaneously issues corresponding warning information, while controlling that first switch is opened and valve stops working, and starts
Circuit includes start-up resistor, second switch, first node and second node and its connection relationship.
Optionally, processing module is used to calculate the difference of the first current value and third 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 issues the first warning information.
Optionally, processing module is for calculating the difference of the first current value and third current value and according to three-phase voltage value
The residual voltage value for calculating second node, when the difference of the first current value and third current value is not above the first preset value, the
Two current values, which are greater than when the residual voltage value of the second preset value and second node is zero, determines that starting-up later time occurs in charge circuit
Failure be charging resistor failure and issue the second warning information.
Optionally, processing module is for calculating the difference of the first current value and third current value and according to three-phase voltage value
The residual voltage value for calculating second node, when the difference of the first current value and third current value is not above the first preset value, the
Two current values determine that the failure of starting-up later time appearance in charge circuit is greater than the second preset value and when residual voltage value is not zero
Resistance valve side failure simultaneously issues third warning information.
Preferably, the first current measurement module and third 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 include at least it is following any one: sound, light, electricity；Warning information includes the first alarm letter
Breath, the second warning information and third warning information.
Second aspect is provided and is filled in a kind of flexible HVDC transmission system of fault detection means provided based on first aspect
The fault detection method of electrical circuit, comprising:
Obtain the first current value, the second current value, three-phase voltage value and third current value；
It determines in charge circuit and starts back according to the first current value, the second current value, three-phase voltage value and third current value
Failure mode when road is broken down simultaneously issues corresponding warning information, while controlling the first switch and opening and the valve
It stops working.
Optionally, it is determined in charge circuit according to the first current value, the second current value, three-phase voltage value and third current value
Failure mode when starting-up later time breaks down simultaneously issues corresponding warning information and includes:
Calculate the difference of the first current value and third current value；When the difference of the first current value and third current value is more than the
When one preset value, determine that the failure that starting-up later time occurs in charge circuit is resistance net side failure and issues 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 third current value
Failure mode when existing failure simultaneously issues corresponding warning information and includes:
Calculate the difference of the first current value and third current value；The residual voltage of second node is calculated according to three-phase voltage value
Value；When the difference of the first current value and third current value is less than the first preset value, the second current value is greater than the second preset value
And the residual voltage value of second node determine when being zero starting-up later time occurs in charge circuit failure be charging resistor failure simultaneously
Issue the second warning information.
Optionally, it is determined in charge circuit according to the first current value, the second current value, three-phase voltage value and third current value
Failure mode when starting-up later time breaks down simultaneously issues corresponding warning information and includes:
Calculate the difference of the first current value and third current value；The residual voltage of second node is calculated according to three-phase voltage value
Value；When the difference of the first current value and third current value is less than the first preset value, the second current value is greater than the second preset value
And residual voltage value determines that the failure that starting-up later time occurs in charge circuit is resistance valve side failure and issues third when being not zero
Warning information.
The third aspect provides a kind of extra-high voltage flexible HVDC transmission system, provides including charge circuit and first aspect
Fault detection means.
The fault detection side of starting-up later time in kind extra-high voltage flexible HVDC transmission system provided in an embodiment of the present invention
Method and device, because the fault detection means 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 set to the output end and first switch of AC network
Between, for detecting the first current value；Second current measurement module is set between start-up resistor and first node, for detecting
Second current value；Third current measurement module is set between tietransformer and the input terminal of valve, for detecting third electric current
Value；Voltage measurement module is set between second node and ground terminal, for detecting three-phase voltage value；Processing module connection first
Switch, valve, the first current measurement module, the second current measurement module, third current measurement module and voltage measurement module, are used for
Obtain the first current value, the second current value, third current value and three-phase voltage value, and according to the first current value, the second current value,
Three-phase voltage value and third current value determine failure mode when starting-up later time breaks down in charge circuit and issue corresponding
Warning information, while controlling that the first switch is opened and the valve stops working, starting-up later time includes start-up resistor, second
Switch, first node and second node and its connection relationship composition.So in the charging to extra-high voltage flexible HVDC transmission system
When failure in circuit is detected, can by by fault detection means current measurement module and voltage measurement module set
The specific position in the charge circuit of extra-high voltage flexible HVDC transmission system is set, to obtain the output end and of AC network
The first current value between the first end of one switch, the second current value between first node and the first end of start-up resistor, the
Third current value between the three-phase voltage value of two nodes and the second end of tietransformer and the input terminal of valve, and these electric currents
Value and voltage value all with starting-up later time in charge circuit normally whether exist close ties, then processing module can be according to this
A little current values and voltage value 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 issues corresponding warning information to remind extra-high voltage flexible HVDC transmission system manager to handle failure in time,
The first switch opening is controlled simultaneously and valve stops working and holds to avoid failure to extra-high voltage flexible HVDC transmission system
It is continuous to influence.Therefore, scheme provided in an embodiment of the present invention can in extra-high voltage flexible HVDC transmission system starting-up later time failure
Accurate detection, further it is also possible that failure influence is preferably minimized and processed as soon as possible.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the charge circuit structural schematic diagram in a kind of flexible HVDC transmission system that the prior art provides；
Fig. 2 is charge circuit fault detection configuration structure schematic diagram in Fig. 1；
Fig. 3 is the charge circuit structural schematic diagram in a kind of extra-high voltage flexible HVDC transmission system that the prior art provides；
Fig. 4 is a kind of fault detection dress applied to starting-up later time in charge circuit in Fig. 3 provided in an embodiment of the present invention
Set structural schematic diagram；
Fig. 5 be another embodiment of the present invention provides a kind of fault detection means setting structure schematic diagram；
Fig. 6 is the complete structure schematic diagram of Fig. 5；
Fig. 7 is a kind of fault detection side of extra-high voltage flexible HVDC transmission system starting-up later time provided in an embodiment of the present invention
Method flow diagram；
Fig. 8 be another embodiment of the present invention provides a kind of extra-high voltage flexible HVDC transmission system starting-up later time failure inspection
Survey method flow schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It should be noted that in the embodiment of the present invention, " illustrative " or " such as " etc. words make example, example for indicating
Card or explanation.Be described as in the embodiment of the present invention " illustrative " or " such as " any embodiment or design scheme do not answer
It is interpreted than other embodiments or design scheme more preferably or more advantage.Specifically, " illustrative " or " example are used
Such as " word is intended to that related notion is presented in specific ways.
It should also be noted that, in the embodiment of the present invention, " (English: of) ", " corresponding (English:
Corresponding, relevant) " it sometimes can be mixed with " corresponding (English: corresponding) ", it should be pointed out that
It is that, when not emphasizing its difference, meaning to be expressed is consistent.
For the ease of clearly describing the technical solution of the embodiment of the present invention, in an embodiment of the present invention, use " the
One ", the printed words such as " second " distinguish 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 HVDC transmission system cannot
It applies in the extra-high voltage flexible HVDC transmission system that tietransformer net side is arranged in starting-up later time, so needing to extra-high
The failure detection schemes of the starting-up later time in the charge circuit of flexible HVDC transmission system are pressed to be redesigned extra-high to guarantee
Press the accurate detection of the failure of the starting-up later time in the charge circuit of flexible HVDC transmission system.
In order to achieve the above object, the embodiment of the present invention provides a kind of extra-high voltage flexible HVDC transmission system, including one kind
For detecting the fault detection means of starting-up later time failure in extra-high voltage flexible HVDC transmission system, referring to shown in Fig. 4, the charging
Circuit includes: first switch S1, second switch S2, start-up resistor R, tietransformer 42 and valve 43；Wherein, AC network 44
Output end passes through first switch S1 connection first node A；First node A passes through second switch S2 connection second node B, starting electricity
It is in parallel with second switch S2 to hinder R；Second node B is connected to the input terminal of valve 43, tietransformer 42 by tietransformer 42
First end and second end ground connection；The fault detection means 45 includes: processing module 455, the first current measurement module 451,
Two current measurement modules 452, third current measurement module 453 and voltage measurement module 454；
First current measurement module 451 is set between the output end and first switch of AC network 44, for detecting the
One current value；Second current measurement module 452 is set between start-up resistor and first node, for detecting the second current value；
Third current measurement module 453 is set between tietransformer and the input terminal of valve, for detecting third current value；Voltage is surveyed
Amount module 454 is set between second node and ground 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
452, third current measurement module 453 and voltage measurement module 454, for obtaining the first current value, the second current value, third 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 third current value
In circuit starting-up later time break down when failure mode and issue corresponding warning information, while control first switch S1 opening
And the valve 43 stops working, starting-up later time 41 includes start-up resistor R, second switch S2, first node A and second node B
And its connection relationship composition.
It should be noted that in Fig. 4 and be not drawn into fault detection means 45, wherein processing module 455, the first current measurement
Module 451, the second current measurement module 452, third current measurement module 453 and voltage measurement module 454 collectively constitute failure
Detection device 45；In addition, being when failure mode of the processing module 455 in determining charge circuit when the failure of starting-up later time 41
Directly judge whether starting-up later time 41 breaks down, and has also just had determined that event when judging that starting-up later time 41 breaks down
Hinder type, processing module 455 judge starting-up later time 41 failure after in order to guarantee failure not long lasting effect charge circuit, no
The failure mode that pipe is judged is what can all go control first switch S1 opening and valve 43 to stop working, so that charging
Circuit is no longer influenced by failure not being formed into a loop also.
Fault detection means provided in an embodiment of the present invention, because the fault detection means includes: processing module, the first electricity
Flow measurement module, the second current measurement module, third 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 set to
Between start-up resistor and first node, for detecting the second current value；Third current measurement module be set to tietransformer with
Between the input terminal of valve, for detecting third current value；Voltage measurement module is set between second node and ground terminal, is used for
Detect three-phase voltage value；Processing module connects first switch, valve, the first current measurement module, the second current measurement module, third
Current measurement module and voltage measurement module, for obtaining the first current value, the second current value, third 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 third current value
Failure mode when existing failure simultaneously issues corresponding warning information, while controlling that first switch is opened and valve stops working, and opens
Dynamic circuit includes start-up resistor, second switch, first node and second node and its connection relationship composition.So to extra-high voltage
It, can be by the way that the electric current in fault detection means be surveyed when failure in the charge circuit of flexible HVDC transmission system is detected
The specific position in the charge circuit of extra-high voltage flexible HVDC transmission system is arranged in amount module and voltage measurement module, to obtain
Take the first of the first current value between the output end of AC network and the first end of first switch, first node and start-up resistor
The second current value, the three-phase voltage value of second node between end and between the second end of tietransformer and the input terminal of valve
Third current value, and these current values and voltage value all with starting-up later time in charge circuit normally whether exist close ties, so
Post-processing module can do respective handling according to these current values and voltage value and calculate to be started back in determining charge circuit later
All kinds of failure modes that road is likely to occur simultaneously issue corresponding warning information to remind extra-high voltage flexible HVDC transmission system pipe
Reason person handles failure in time, while controlling that the first switch is opened and valve stops working to avoid failure to extra-high
Press the long lasting effect of flexible HVDC 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 failure influence be preferably minimized and also as soon as possible by
Processing.
Optionally, processing module is used to calculate the difference of the first current value and third 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 issues the first warning information.
Specifically, because when start-up resistor net side failure occurs in starting-up later time, typically because connection wire conduit is exhausted
Ground fault caused by edge layer is damaged, at this time because the electric current of AC network output will lead to the first current measurement with being directly entered
The first current value that module measures can be very big, and electric current of the start-up resistor close to the side of valve will also become very little, so this
When the detection of third current measurement module third electric current can very little, and the error that is occurred according to actual capabilities and to opening
The calculated result of first current value of circuit when dynamic resistance net side failure is it can be concluded that first preset value, when the first electric current
It is that start-up resistor net side breaks down that value and the difference of third current value not can determine that when being not above the first preset value, when first
The difference of current value and third current value does not need to consider further that the detected value of other measurement modules when being more than the first preset value
To determine, starting-up later time failure is exactly start-up resistor net side failure in charge circuit.
Optionally, processing module is for calculating the difference of the first current value and third current value and according to three-phase voltage value
The residual voltage value for calculating second node, when the difference of the first current value and third current value is not above the first preset value, the
Two current values, which are greater than when the residual voltage value of the second preset value and second node is zero, determines that starting-up later time occurs in charge circuit
Failure be charging resistor failure and issue the second warning information.
Specifically, the resistance value of start-up resistor can become smaller because the failure that start-up resistor generates is usually partial short circuit, charging
Therefore the resistance value of circuit entirety also reduces, so at this time charge circuit is whole or connection, the first current value and the at this time
Three current values may will appear 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 third current value；And at this time because charge circuit is whole
Resistance value also reduce, so at this time the second current measurement module detection the second current value will increase, can according to second electricity
The increase judgement of flow valuve may be that start-up resistor has occurred failure, but also to there is ground fault in start-up resistor valve side
When from the electric current that AC network exports flows into ground to from fault ground, when compared to charge circuit normal work for, at this time second
Current measurement module detection the second current value also will increase, but at this time because start-up resistor valve side there is ground fault
The three-phase voltage value of the second node of voltage measurement module detection at this time can be uneven because of ground connection, so that according to second
The residual voltage value for the second node that the three-phase voltage of node calculates can be not zero, so according to the residual voltage value of second node
Be zero can exclude start-up resistor valve side failure, described processing module can be in the difference of the first current value and third current value
It is determined when value is not above the first preset value, the second current value is greater than the second preset value and the residual voltage value of second node is zero
The failure that starting-up later time occurs in charge circuit is charging resistor failure, and the second preset value here is to count practical start-up resistor
Fault current integration obtains when failure.
Optionally, processing module is for calculating the difference of the first current value and third current value and according to three-phase voltage value
The residual voltage value for calculating second node, when the difference of the first current value and third current value is not above the first preset value, the
Two current values determine that the failure of starting-up later time appearance in charge circuit is greater than the second preset value and when residual voltage value is not zero
Resistance valve side failure simultaneously issues third warning information.
Specifically, when start-up resistor valve side failure occurs in starting-up later time, reason is similar with start-up resistor net side failure is all
Because ground fault caused by connecting line pipe insulation layer damages can be expected first according to the first current value and third current value
Difference determine failure, but from electric current of the AC network to from ground fault because the presence of start-up resistor is still very big,
So while the first current value of the first current measurement module detection at this time and the third electric current of third current measurement module detection
There are differences for value, but this is very little relative to the range of the first current measurement module and third current measurement module, are filling
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 greater than the difference of the first current value and third current value in start-up resistor valve side failure, so row
The idea of such failure is judged except the difference according to the first current value and third current value；It is determined by aforementioned charging resistor failure
The analysis of method is it is found that the second current value will increase when start-up resistor valve side failure occurs in starting-up later time in charge circuit, and 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 third current value
One preset value, the second current value, which are greater than, to be determined in charge circuit when the residual voltage value of the second preset value and second node is zero and opens
The failure that dynamic circuit occurs is charging resistor failure.
Preferably, referring to Figure 5, the first current measurement module 451 shown in Fig. 4 is CT, Fig. 4 in actual circuit
Shown in third current measurement module 453 be in actual circuit electromagnetic current transducer IacY, second shown in Fig. 4
Current measurement module 452 is electronic current mutual inductor IvC in actual circuit, and 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 455 in Fig. 4 and its connection relationship in Fig. 5
Show, concrete condition can refer to practical connection relationship.
Specifically, because starting-up later time occurs relying primarily on first when start-up resistor net side failure in determining charge circuit
First current value of current measurement module detection and the difference of third measurement module detection third current value carry out interpretation, and charge
The first electric current occurs when start-up resistor net side failure in circuit can be very big, third current value can very little, without the concern for precision and amount
Journey, so the first current measurement module and third current measurement module select the common electromagnetism of flexible HVDC transmission system here
Formula current transformer；When charge circuit works normally, the second electric current very little of the second current measurement module detection only has 3-5A,
And when part short trouble occurs for start-up resistor itself, the second electric current might have tens A, but this transmits electricity relative to general
It is fairly small for being detected for the detection range of the electromagnetic current transducer of electric current in system, and electromagnetic current transducer
Measurement accuracy also be not enough to measure the difference of low current, so the second current measurement module selects precision higher herein, amount
The lesser electronic current mutual inductor of journey, according to the actual situation, the parameter that general electronic current mutual inductor is chosen are range
100A, precision 5/1000ths.
Optionally, warning information include at least it is following any one: sound, light, electricity；Warning information includes the first alarm letter
Breath, the second warning information and third warning information.
Specifically, extra-high voltage flexible HVDC transmission system manager or maintenance person receive the first warning information,
Any warning information or whens multiple warning information, can go to extra-high voltage flexible direct current in second warning information and third warning information
The charge circuit of transmission system does corresponding repairing.
Illustratively, in practice the charge circuit in extra-high voltage flexible HVDC transmission system not only only have it is above-mentioned it is several about
The failure of charging resistor, there are also other components can failure, so can also exist on the charge circuit referring to shown in Fig. 6 other
Current transformer or voltage transformer are used to detect the failure of other charge circuits.
Referring to shown in Fig. 7, it is flexible straight that the embodiment of the present invention also provides a kind of extra-high voltage based on above-mentioned fault detection means
The fault detection method of the starting-up later time of charge circuit in transmission system is flowed, this method comprises:
701, the first current value, the second current value, three-phase voltage value and third current value are obtained.
Specifically, the first current value is the current value between the output end of AC network and the first end of first switch；The
Current value of two current values between first node and the first end of start-up resistor；Three-phase voltage value is the three-phase electricity of second node
Pressure value；Third current value is the current value between the second end of tietransformer and the input terminal of valve.
702, determine that charge circuit occurs according to the first current value, the second current value, three-phase voltage value and third current value
Failure mode and issue corresponding warning information, while control first switch open and valve stop working.
The fault detection method of starting-up later time in flexible HVDC transmission system provided in an embodiment of the present invention, because of this method
It include: to obtain the first current value, the second current value, three-phase voltage value and third current value；According to the first current value, the second electric current
Value, three-phase voltage value and third current value determine charge circuit occur failure mode and issue corresponding warning information, simultaneously
Control first switch is opened and valve stops working.Because between the output end of AC network and the first end of first switch
The three-phase voltage value and connection of the second current value, second node between one current value, first node and the first end of start-up resistor
Connect the third current value between the second end of transformer and the input terminal of valve all with starting-up later time in charge circuit normally whether deposit
It is maintaining close ties with, then processing module can do respective handling according to these current values and voltage value and calculate determining charging later
Starting-up later time is likely to occur in circuit all kinds of failure modes simultaneously issue corresponding warning information, while controlling first switch opening
And valve stops working.Therefore, scheme provided in an embodiment of the present invention can start back in extra-high voltage flexible HVDC transmission system
The failure on road accurately detects.
Referring to shown in Fig. 8, the embodiment of the present invention also provides the failure of starting-up later time in another flexible HVDC transmission system
Detection method is as the fault detection method to starting-up later time in flexible HVDC transmission system provided by the above embodiment more into one
The supplementary explanation of step, this method comprises:
801, the first current value, the second current value, three-phase voltage value and third current value are obtained.
802, it calculates the difference of the first current value and third current value and calculates the zero of second node according to three-phase voltage value
Sequence voltage value；
8031, it when the difference of the first current value and third current value is more than the first preset value, determines in charge circuit and opens
The failure that dynamic circuit occurs is resistance net side failure and issues the first warning information, while controlling that first switch is opened and valve stops
Only work.
8032, when the difference of the first current value and third current value is less than the first preset value, the second current value is greater than the
The failure for determining that starting-up later time occurs in charge circuit when two preset values and when the residual voltage value of second node is zero is charging
Resistance Fault simultaneously issue the second warning information, while control first switch open and valve stop working.
8033, when the difference of the first current value and third current value is less than the first preset value, the second current value is greater than the
Determine that the failure that starting-up later time occurs in charge circuit is resistance valve side failure when two preset values and when residual voltage value is not zero
And issue third warning information, while control first switch open and valve stop working.
In conclusion in flexible HVDC transmission system provided in an embodiment of the present invention the fault detection method of starting-up later time and
Device, because the fault detection means includes: processing module, the first current measurement module, the second current measurement module, third electricity
Flow measurement module and voltage measurement module；First current measurement module be set to AC network output end and first switch it
Between, for detecting the first current value；Second current measurement module is set between start-up resistor and first node, for detecting the
Two current values；Third current measurement module is set between tietransformer and the input terminal of valve, for detecting third current value；
Voltage measurement module is set between second node and ground terminal, for detecting three-phase voltage value；The first electricity of processing module connection
Flow measurement module, the second current measurement module, third current measurement module and voltage measurement module, for obtaining the first electric current
Value, the second current value, third current value and three-phase voltage value, and according to the first current value, the second current value, three-phase voltage value and
Third current value determines failure mode when starting-up later time in charge circuit breaks down and issues corresponding warning information, simultaneously
Control first switch is opened and valve stops working, and starting-up later time includes start-up resistor, second switch, first node and the second section
Point and its connection relationship composition.So the failure in the starting-up later time to extra-high voltage flexible HVDC transmission system detects
When, can by by fault detection means current measurement module and voltage measurement module be arranged it is defeated in extra-high voltage flexible direct current
Specific position in the charge circuit of electric system, to obtain between the output end of AC network and the first end of first switch
The three-phase voltage value of the second current value, second node between first current value, first node and the first end of start-up resistor and
Third current value between the second end of tietransformer and the input terminal of valve, and these current values and voltage value all with charge back
In road starting-up later time it is normal whether exist close ties, then processing module can be done according to these current values and voltage value
Respective handling calculates all kinds of failure modes and the corresponding alarm of sending for determining that starting-up later time is likely to occur in charge circuit later
Information controls described first and opens to remind extra-high voltage flexible HVDC transmission system manager to handle failure in time
The long lasting effect that pass is opened and valve stops working to avoid failure to extra-high voltage flexible HVDC transmission system.Therefore, of the invention
The scheme that embodiment provides the failure of starting-up later time can accurately detect in extra-high voltage flexible HVDC transmission system, it is further also
Failure influence can be made to be preferably minimized and processed as soon as possible.
The embodiment of the present invention also provides a kind of computer program, which can be loaded directly into memory, and
Containing software code, which is loaded into via computer and to can be realized above-mentioned extra-high voltage flexible direct current after executing defeated
The fault detection method of starting-up later time in electric system.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (11)
1. a kind of fault detection means, applied to the starting-up later time of the charge circuit in extra-high voltage flexible HVDC transmission system, institute
Stating charge circuit includes: first switch, second switch, start-up resistor, tietransformer and valve；Wherein, the output of AC network
End connects first node by the first switch；The first node connects second node by the second switch, described
Start-up resistor is in parallel with the second switch；The second node is connected to the input terminal of valve, institute by the tietransformer
State the first end and second end ground connection of tietransformer；It is characterized in that, the fault detection means includes: processing module,
One current measurement module, the second current measurement module, third current measurement module and voltage measurement module；
First current measurement module is set between the output end of the AC network and the first switch, for measuring
First current value；Second current measurement module is set between the start-up resistor and the first node, for measuring
Second current value；The third current measurement module is set between the tietransformer and the input terminal of the valve, is used for
Measure third current value；The voltage measurement module is set between the second node and ground terminal, for measuring three-phase electricity
Pressure value；
The processing module connects the first switch, valve, first current measurement module, the second current measurement mould
Block, the third current measurement module and the voltage measurement module, for obtaining first current value, second electric current
Value, the third current value and the three-phase voltage value, and according to first current value, the third current value, described the
Two current values and the three-phase voltage value judge failure mode and sending when starting-up later time breaks down in the charge circuit
Corresponding warning information, while controlling that the first switch is opened and the valve stops working；The starting-up later time includes institute
State start-up resistor, the second switch, the first node and the second node and its connection relationship.
2. fault detection means according to claim 1, which is characterized in that
The processing module is used to calculate the difference of first current value and the third current value；When first current value
When being more than the first preset value with the difference of the third current value, the processing module determines starting-up later time in the charge circuit
The failure of appearance is resistance net side failure and issues the first warning information.
3. fault detection means according to claim 1, which is characterized in that
The processing module is for calculating the difference of first current value and the third current value and according to the three-phase
Voltage value calculates the residual voltage value of the second node, when the difference of first current value and the third current value does not have
It is greater than more than the first preset value, second current value true when the residual voltage value of the second preset value and the second node is zero
The failure that starting-up later time occurs in the fixed charge circuit is start-up resistor failure and issues the second warning information.
4. fault detection means according to claim 1, which is characterized in that
The processing module is for calculating the difference of first current value and the third current value and according to the three-phase
Voltage value calculates the residual voltage value of the second node, when the difference of first current value and the third current value does not have
It is filled described in being determined more than the first preset value, second current value greater than the second preset value and when the residual voltage value is not zero
The failure that starting-up later time occurs in electrical circuit is resistance valve side failure and issues third warning information.
5. fault detection means according to claim 1, which is characterized 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. fault detection means according to claim 1-5, which is characterized in that the warning information includes at least
Below any one: sound, light, electricity；The warning information includes the first warning information, the second warning information and third alarm letter
Breath.
7. being opened in a kind of extra-high voltage flexible HVDC transmission system based on fault detection means described in any one of claims 1-6
The fault detection method in dynamic circuit characterized by comprising
Obtain first current value, second current value, the three-phase voltage value and the third current value；
According to the determination of first current value, second current value, the three-phase voltage value and the third current value
Failure mode when starting-up later time breaks down in charge circuit simultaneously issues corresponding warning information, while controlling described first and opening
It closes opening and the valve stops working.
8. the failure of starting-up later time in the extra-high voltage flexible HVDC transmission system of fault detection means according to claim 7
Detection method, which is characterized in that described according to first current value, second current value, the three-phase voltage value and institute
Third current value is stated to determine failure mode when starting-up later time breaks down in the charge circuit and issue corresponding alarm letter
Breath includes:
Calculate the difference of first current value and the third current value；
When the difference of first current value and the third 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 issues the first warning information.
9. the failure of starting-up later time in the extra-high voltage flexible HVDC transmission system of fault detection means according to claim 7
Detection method, which is characterized in that described according to first current value, second current value, the three-phase voltage value and institute
Third current value is stated to determine failure mode when starting-up later time breaks down in the charge circuit and issue corresponding alarm letter
Breath includes:
Calculate the difference of first current value and the third 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 third current value is less than the first preset value, second current value is greater than
Determine that event occurs in starting-up later time in the charge circuit when the second preset value and when the residual voltage value of the second node is zero
Failure when barrier is start-up resistor failure and issues the second warning information.
10. the event of starting-up later time in the extra-high voltage flexible HVDC transmission system of fault detection means according to claim 7
Hinder detection method, which is characterized in that it is described according to first current value, second current value, the three-phase voltage value and
The third current value determines failure mode when starting-up later time breaks down in the charge circuit and issues corresponding alarm
Information includes:
Calculate the difference of first current value and the third 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 third current value is less than the first preset value, second current value is greater than
Determine the failure that starting-up later time occurs in the charge circuit for electricity when the second preset value and when the residual voltage value is not zero
Resistance valve side failure simultaneously issues third warning information.
11. a kind of extra-high voltage flexible HVDC transmission system, which is characterized in that including charge circuit and as claim 1-6 is any
Fault detection means described in.
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