CN107728508B - A kind of control guard method of flexible direct current system and its control protective unit - Google Patents
A kind of control guard method of flexible direct current system and its control protective unit Download PDFInfo
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- CN107728508B CN107728508B CN201710780454.9A CN201710780454A CN107728508B CN 107728508 B CN107728508 B CN 107728508B CN 201710780454 A CN201710780454 A CN 201710780454A CN 107728508 B CN107728508 B CN 107728508B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000001681 protective effect Effects 0.000 title claims abstract description 19
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000009471 action Effects 0.000 claims description 15
- 238000012423 maintenance Methods 0.000 claims description 13
- 238000012217 deletion Methods 0.000 claims description 9
- 230000037430 deletion Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 239000013307 optical fiber Substances 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000002411 adverse Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
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- 230000008439 repair process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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Abstract
Control guard method and its control protective unit the present invention provides a kind of flexible direct current system; it is related to technical field of direct current power transmission; the period of stopping transport can be accurately identified, and whether there is or not the black modules of the second class to generate; and then guarantee the safe operation of flexible direct current system, improve the availability of modular multilevel converter valve.Wherein, the control guard method of flexible direct current system includes: and detects the black module being bypassed in a preceding run the period, note down the fisrt feature information of black module；In the period of currently stopping transport, fisrt feature information is stored；It is being currently up charge period, is detecting black module, is noting down and store the second feature information of black module；Fisrt feature information is compared with second feature information, judges whether fisrt feature information is consistent with second feature information；If so, issuing permission unlock instruction；Forbid unlock instruction if it is not, issuing.The control guard method of above-mentioned flexible direct current system is for guaranteeing flexible direct current system safe and stable operation.
Description
Technical field
The present invention relates to the control guard method of technical field of direct current power transmission more particularly to a kind of flexible direct current system and its
Control protective unit.
Background technique
Modular multilevel converter valve is made of multiple power modules, is the hardcore of flexible direct current system.To guarantee
The safe and stable operation of modular multilevel converter valve and flexible direct current system generallys use control protective unit, example at present
If state of the valve level controller to multiple power modules in modular multilevel converter valve is monitored and controlled, with realization pair
Effective management of power module.
As shown in Figure 1, power module 1 includes the first electronic device S1, the second electronic device S2, the first anti-paralleled diode
D1, the first anti-paralleled diode D2, capacitor C0, mechanical bypass contactor K1, bypass thyristor K2, discharge resistance R, a high position take
It can power supply P and Control card (not shown).The connection relationship of power module 1 and valve level controller 2 as shown in connection with fig. 2
Schematic diagram, valve level controller 2 is connected with each power module 1 in modular multilevel converter valve respectively by optical fiber, when soft
Property direct current system starting when, power module 1 start to work: by do not control charging give capacitor C0Charging a, so that high position be enabled to take energy
Power supply P is the Control card power supply on place power module 1, and then Control card is enabled to pass through uplink optical fibers 3 for place power mould
The status information of block 1 is sent in valve level controller 2.When valve level controller 2 is not received by Control card whithin a period of time
On the status information sent or when receiving the fault status information sent on Control card, valve level controller 2 by downlink optical fiber 4 to
Corresponding Control card issues bypass commands, the machinery of power module 1 where Control card controls under the action of bypass commands
Formula bypass contactor K1Closure, keeps the power module 1 out of service.
But in practical applications, due to factors such as 3 failures of 1 faults itself of power module or uplink optical fibers, portion can be made
Point power module 1 can not it is normal on send status information, at this point, this kind of power module 1 is referred to as black module.Black module mainly includes
A kind of black module, the black module of the second class and the black module three types of third class.Wherein, the black module of the first kind is in flexible direct current system
The power module being bypassed in a preceding operational process for system.The black module of second class is the stoppage in transit phase in flexible direct current system
Between, the power for sending status information is led to not by high-order draw-out power supply P failure, Control card failure or 3 failure of uplink optical fibers
Module 1.The black module of third class be flexible direct current system operation after, by high-order draw-out power supply P failure, Control card failure or on
3 failure of row optical fiber causes the status information sent to be interrupted, but remains to normal bypass and will not be to the safety of flexible direct current system
The power module 1 that stable operation impacts.
For the black module of the issuable first kind before flexible direct current system operation and the black module of the second class, due to the
A kind of black module reliably bypasses, thus when module black there is only the first kind in flexible direct current system, in flexible direct current system
After system unlock operation, the black module of the first kind will not the modular multilevel converter valve to place cause adverse effect, and then will not
Influence the safe and stable operation of flexible direct current system.But when module black there are the second class in flexible direct current system, in flexibility
Direct current system unlock operation after, the black module of the second class can the modular multilevel converter valve to place cause very unfavorable shadow
It rings, will lead to entire modular multilevel converter valve when serious and be damaged, and then influence the safe operation of flexible direct current system.
In the prior art, in order to avoid the safe and stable operation that the black module of the second class influences flexible direct current system, when
It is detected in modular multilevel converter valve before flexible direct current system operation there are after black module, it can only be how electric to entire modularization
Flat converter valve carries out locking trip operation, and the modular multilevel converter valve is made to stop working.But using this kind of method, when
When in modular multilevel converter valve there is only the black module of the dysgenic first kind will not be caused to flexible direct current system, also can
Locking trip operation is carried out to entire modular multilevel converter valve, what this was greatly lowered modular multilevel converter valve can
Utilization rate.
Summary of the invention
Control guard method and control protective unit the present invention provides a kind of flexible direct current system, can accurately identify soft
Property direct current system the stoppage in transit period generated whether there is or not the black module of the second class, and then on the one hand ensure that the safety of flexible direct current system is steady
Fixed operation, on the other hand improves the availability of modular multilevel converter valve in flexible direct current system.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
The first aspect of the present invention provides a kind of control guard method of flexible direct current system, the flexible direct current system
Duty cycle include stop transport period, starting charge period and run the period；The control guard method of the flexible direct current system
Include:
Step S1: in the run the period in the preceding one action period of flexible direct current system, the more level changes of current of detection moduleization
The black module being bypassed in valve, and note down the fisrt feature information of detected black module；
Step S2: in the stoppage in transit period of the current operating cycle of the flexible direct current system, to the fisrt feature information
It is stored；
Step S3: in the starting charge period of the current operating cycle of the flexible direct current system, the modularization is detected
The second feature information of detected black module is noted down and stored to black module present in more level converter valves；By described
One characteristic information is compared with the second feature information, judges that the fisrt feature information is with the second feature information
It is no consistent；If so, issuing permission unlock instruction；Forbid unlock instruction if it is not, issuing.
It is primary before flexible direct current system in the control guard method of the flexible direct current system provided by the present embodiment
The fisrt feature information that the run the period of duty cycle is noted down is the corresponding characteristic information of the black module of the first kind.When in current work
When making the starting charge period in period and comparing out second feature information and inconsistent fisrt feature information, illustrate in work at present week
The stoppage in transit period of phase has the black module of the second class to generate, and forbids unlock instruction by issuing at this time, flexible direct current system is forbidden to continue
Unlock operation can avoid the black module of the second class and bring adverse effect to the safe operation of flexible direct current system.When in current work
Make the period starting charge period compare out second feature information it is consistent with fisrt feature information when, illustrate in current operating cycle
The stoppage in transit period generated without the black module of the second class, permission unlock instruction can be issued at this time, flexible direct current system is allowed to continue to solve
Lock operation.With detect that there are change after black module entire modular multilevel in modular multilevel converter valve in the prior art
The method that stream valve carries out locking trip operation is compared, using the control protection side of flexible direct current system provided by the present embodiment
Method, whether there is or not the black modules of the second class to generate during the stoppage in transit of flexible direct current system can be recognized accurately, and on the one hand ensure that flexibility
On the other hand the safe and stable operation of direct current system improves the available of modular multilevel converter valve in flexible direct current system
Rate.
The second aspect of the present invention provides a kind of control protective unit of flexible direct current system, including characteristic information identification
Module, memory module, comparison module and control module；
Wherein, the characteristic information identification module respectively with multiple power module phases in modular multilevel converter valve
Even；In the run the period in the preceding one action period of the flexible direct current system, the characteristic information identification module is for detecting
The black module being bypassed in the modular multilevel converter valve, and the fisrt feature information of detected black module is carried out
Record；
The memory module is connected with the characteristic information identification module；In the work at present week of the flexible direct current system
The stoppage in transit period of phase, the fisrt feature information that the memory module is used to record the characteristic information identification module are deposited
Storage；
In the starting charge period of the current operating cycle of the flexible direct current system, the characteristic information identifies mould
Block is also used to detect the black module in the modular multilevel converter valve, and the second feature of detected black module is believed
Breath is noted down；The memory module is also used to store the second feature information that the characteristic information identification module is noted down；
The comparison module is connected with the memory module and the control module respectively；In the flexible direct current system
The starting charge period of current operating cycle, the comparison module are used for the fisrt feature information for being stored the memory module
It is compared with second feature information, and judges whether the fisrt feature information and the second feature information are consistent；If so,
Permission unlock instruction is issued by the control module；Forbid unlock instruction if it is not, issuing by the control module.
The beneficial effect and the first aspect of the present invention of the control protective unit of flexible direct current system provided by the present invention
The beneficial effect of the control guard method of provided flexible direct current system is identical, and details are not described herein again.
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
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structural schematic diagram of power module provided by the prior art；
Fig. 2 is the connection relationship diagram of power module and valve level controller provided by the prior art；
Fig. 3 is the flow chart of the control guard method of flexible direct current system provided by the embodiment of the present invention one；
Fig. 4 is the current flow diagram of the black module of internal fault during the charging process provided by the embodiment of the present invention one；
Fig. 5 is the structural schematic diagram one of the control protective unit of flexible direct current system provided by the embodiment of the present invention two；
Fig. 6 is the structural schematic diagram two of the control protective unit of flexible direct current system provided by the embodiment of the present invention two；
Description of symbols:
1- power module；2- valve level controller；
3- uplink optical fibers；4- downlink optical fiber；
5- characteristic information identification module；6- memory module；
7- comparison module；8- control module；
9- information deletion module；10- information adding module；
S1- the first electronic device； S2- the second electronic device；
D1- the first anti-paralleled diode； D2- the second anti-paralleled diode；
K1Mechanical bypass contactor； K2Bypass thyristor；
C0Capacitor；R- discharge resistance；
P- high position draw-out power supply.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, implement below in conjunction with the present invention
Attached drawing in example, technical scheme in the embodiment of the invention is clearly and completely described.Obviously, described embodiment
Only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
Art personnel all other embodiment obtained without creative labor belongs to the model that the present invention protects
It encloses.
Embodiment one
As shown in figure 3, a kind of control guard method of flexible direct current system is present embodiments provided, flexible direct current system
Duty cycle includes stop transport period, starting charge period and run the period.The control guard method of the flexible direct current system includes:
Step S1: in the run the period in the preceding one action period of flexible direct current system, the more level changes of current of detection moduleization
The black module being bypassed in valve, and note down the fisrt feature information of detected black module.
Step S2: in the stoppage in transit period of the current operating cycle of flexible direct current system, fisrt feature information is stored.
Step S3: in the starting charge period of the current operating cycle of flexible direct current system, the more level of detection moduleization are changed
Black module present in valve is flowed, the second feature information of detected black module is noted down and store；By fisrt feature information with
Second feature information is compared, and judges whether fisrt feature information is consistent with second feature information；If so, issuing allows to unlock
Instruction；Forbid unlock instruction if it is not, issuing.
It should be noted that in the actual motion of modular multilevel converter valve, due to power module faults itself or
The factors such as uplink optical fibers failure, leading to not send the power module of status information on normal is black module.The feature of black module is believed
Breath refers to the information for being able to reflect black modular character, such as may include the location information of black module and the number information of black module.
Correspondingly, fisrt feature information specifically may include being detected in the run the period in the preceding one action period of flexible direct current system
The location information of the total number information of black module out and/or each black module；Second feature information specifically may include in flexibility
The total number information of detected black module and/or each black in the starting charge period of the current operating cycle of direct current system
The location information of module.
Since the black module of the first kind is the black module in the preceding run the period generation of flexible direct current system, the second class is black
Module is the black module generated in the period of stopping transport of flexible direct current system, therefore, the flexible direct current system provided by the present embodiment
In the control guard method of system, in the fisrt feature letter that the run the period in the preceding one action period of flexible direct current system is noted down
Breath is the corresponding characteristic information of the black module of the first kind.When the stoppage in transit period no second of the current operating cycle of flexible direct current system
When the black module of class generates, the black module detected by the starting charge period of current operating cycle only includes the black mould of the first kind
Block, the second feature information recorded also just only correspond to the characteristic information of the black module of the first kind, at this time fisrt feature information and the
Two characteristic informations are consistent.When the stoppage in transit period of the current operating cycle of flexible direct current system thering is the black module of the second class to generate, when
Black module detected by the starting charge period of preceding duty cycle just includes the black module of the first kind and the black module of the second class, is remembered
The second feature information of record also should just correspond to the characteristic information of the black module of the first kind and the black module of the second class, at this time fisrt feature
Information and second feature information are inconsistent.
Therefore in the control guard method of the flexible direct current system provided by the present embodiment, fisrt feature is believed
After breath and second feature information are compared, if judging, fisrt feature information and second feature information are inconsistent, illustrate to stop
The fortune period has the black module of the second class to generate, in order to avoid the second class black module the safe operation of flexible direct current system is brought it is bad
It influences, can forbid unlock instruction that flexible direct current system is forbidden to continue unlock operation by issuing.If judging fisrt feature information
It is consistent with second feature information, then illustrate the black module generation of period no second class of stopping transport, at this time modular multilevel converter valve
In there is only the black modules of the first kind, since the black module of the first kind will not bring bad shadow to the safe operation of flexible direct current system
It rings, thus unlock instruction can be allowed to run flexible direct current system normal release by issuing.With in the prior art to entire mould
The method that the more level converter valves of blockization carry out locking trip operation is compared, using flexible direct current system provided by the present embodiment
Guard method is controlled, whether there is or not the black modules of the second class to generate during the stoppage in transit of flexible direct current system can be recognized accurately, on the one hand
It ensure that the safe and stable operation of flexible direct current system, on the other hand improve the modular multilevel change of current in flexible direct current system
The availability of valve reduces what generated black module in modular multilevel converter valve normally started flexible direct current system
It influences.
It, can be according to can it should be noted that when being detected to the black module in modular multilevel converter valve
The status information sent on power module is received as the foundation for detecting black module, when cannot receive power module on the shape that send
When state information, illustrate that the power module is black module.
Optionally, work can be enabled by way of issuing to operating platform and allowing unlock instruction or forbid unlock instruction
Personnel obtain corresponding information in operating platform, then execute operation, control flexible direct current system unlock via staff
It runs or unlock is forbidden to run.It is of course also possible to which being issued by the tripper directly into flexible direct current system allows to unlock
The mode for instructing or forbidding unlock instruction directly controls flexible direct current system unlock operation or unlock is forbidden to run.
It is understood that allowing to unlock in the control guard method of the flexible direct current system provided by the present embodiment
Instruction and permission unlock instruction are automatically generated according to the comparison result of fisrt feature information and second feature information, without logical
It crosses staff and judges whether flexible direct current system allows to unlock, so, can not only reduce consumed manpower, moreover it is possible to
Error in judgement caused by avoiding the problem that by manual operation, to be further ensured that the safety and stability fortune of flexible direct current system
Row.
In practical applications, the black module of the second class in modular multilevel converter valve specifically may include the black module of internal fault
With the black module of outer failure.Wherein, the black module of internal fault refers to during the stoppage in transit of flexible direct current system, and an internal high position takes can electricity
The power module that source or Control card break down.The outer black module of failure refers to that during the stoppage in transit of flexible direct current system, institute is right
The power module that the uplink optical fibers answered break down.
By taking the black module of internal fault as an example, due in the black module of internal fault high-order draw-out power supply or Control card occur therefore
Barrier, thus, in the starting charge period of the current operating cycle of flexible direct current system, Control card can not on send where internal fault
The status information of black module, meanwhile, the black module of internal fault is mechanical where bypass commands can not be also transmitted to by Control card
In bypass contactor, this results in the black module of internal fault to lose bypass capability.Thus, operation is unlocked in flexible direct current system
Afterwards, the black module of internal fault will be charged due to that can not be bypassed in modular multilevel converter valve circuit, be charged
Journey is as follows:
As shown in figure 4, (bridge arm current flow direction is such as straight when bridge arm current flows to negative DC bus by positive DC bus
Shown in line), bridge arm current passes through diode D1To capacitor C0It charges；When bridge arm current is flowed to just by negative DC bus
When the DC bus of pole (bridge arm current flow direction is shown in dotted line), bridge arm current passes through diode D2To capacitor C0It charges.By
In the first electronic device S1With the second electronic device S2It is in blocking, therefore capacitor C0Only charge circuit discharge off
Circuit, at this moment capacitor C0Voltage will quickly increase until breakdown damage, or even generate explosion.
But use the present embodiment provided by flexible direct current system control guard method, can to stop transport the stage whether there is or not
The black module generation of second class is accurately identified, when identifying that there is the generation of the black module of the second class in the stoppage in transit stage, can pass through to
Operating platform, which issues, forbids unlock instruction, forbids flexible direct current system unlock operation, and then also avoid the black module of the second class
Adverse effect to flexible direct current system.
Further, the black module present in the run the period in the preceding one action period for detecting flexible direct current system
When excessive, after being stored to fisrt feature information, some or all of detected black module can also be examined
It repairs, such as black module is repaired or replaced.After being overhauled to black module, for avoid it is subsequent to fisrt feature information and
Erroneous judgement is generated when second feature information is compared, it is also necessary to which characteristic information corresponding to the black module after maintenance is special from first
It is deleted in reference breath.
Corresponding, after storing to fisrt feature information, step S2 may also include that flexible direct current system
Some or all of the detected black module of the run the period in preceding one action period is overhauled, and by the black mould after maintenance
The corresponding characteristic information of block is deleted from the fisrt feature information stored.
Illustratively, it when fisrt feature information is the total number information of black module, after being overhauled to black module, needs
The total number of the black module of maintenance is deducted from fisrt feature information；When the position that fisrt feature information is each black module
When information, after overhauling to black module, the location information by the black module of maintenance is needed to delete from fisrt feature information.
It further,, can also be right after being stored to fisrt feature information in the stoppage in transit period of flexible direct current system
Power module in modular multilevel converter valve is checked, when discovery is with the presence of power module security risk, to avoid
This Partial Power module is damaged in flexible direct current system run the period, leads to the irregular operation of flexible direct current system, can
To this part, there are the power modules of security risk to bypass during stoppage in transit.Also, to there are the power of security risk
After module is bypassed, it is also necessary to the characteristic information of the power module after bypass is increased in fisrt feature information, to avoid
Erroneous judgement is generated when fisrt feature information and second feature information is compared in the starting charge period of current operating cycle.
Corresponding, after storing to fisrt feature information, step S2, which may also include that, changes modular multilevel
Part power module is bypassed in stream valve, and the characteristic information of the power module after bypass is increased to the first stored spy
In reference breath.
Embodiment two
Present embodiments provide a kind of control protective unit of flexible direct current system, the control protection of the flexible direct current system
Device is corresponding with the control guard method of flexible direct current system provided by embodiment one.
As shown in figure 5, the control protective unit of flexible direct current system provided in this embodiment specifically includes characteristic information knowledge
Other module 5, memory module 6, comparison module 7 and control module 8.
Wherein, characteristic information identification module 5 is connected with multiple power modules 1 in modular multilevel converter valve respectively.
In the run the period in the preceding one action period of flexible direct current system, how electric characteristic information identification module 5 is for detection moduleization
The black module being bypassed in flat converter valve, and the fisrt feature information of detected black module is noted down.
Memory module 6 is connected with characteristic information identification module 5, in the stoppage in transit of the current operating cycle of flexible direct current system
Section, the fisrt feature information that memory module 6 is used to record characteristic information identification module 5 store.
In the starting charge period of the current operating cycle of flexible direct current system, characteristic information identification module 5 is also used to examine
The black module in modular multilevel converter valve is surveyed, and the second feature information of detected black module is noted down；It deposits
Storage module 6 is also used to store the second feature information that characteristic information identification module 5 is noted down.
Comparison module 7 is connected with memory module 6 and control module 8 respectively；In the current operating cycle of flexible direct current system
Starting charge period, comparison module 7 is used for the fisrt feature information that is stored memory module 6 and second feature information carries out
It compares, and judges whether fisrt feature information is consistent with second feature information；If so, being issued by control module 8 allows to unlock
Instruction；Forbid unlock instruction if it is not, issuing by control module 8.
In the control protective unit of the flexible direct current system provided by the present embodiment, by characteristic information identification module 5,
Mutual cooperation between memory module 6, comparison module 7 and control module 8, can be to the preceding one action period of flexible direct current system
Run the period detected by the fisrt feature information of the black module of the first kind noted down and stored, and to flexible direct current system
The second feature information of black module detected by the starting charge period of the current operating cycle of system is noted down and is stored.In
After fisrt feature information and second feature information are compared, if judging, fisrt feature information and second feature information are different
It causes, then illustrates that the stoppage in transit period has the black module of the second class to generate, in order to avoid the black module of the second class is to the safety of flexible direct current system
Operation brings adverse effect, can be issued by control module 8 and forbid unlock instruction, and flexible direct current system is forbidden to continue unlock fortune
Row.If judging, fisrt feature information is consistent with second feature information, illustrates the black module generation of period no second class of stopping transport,
There is only the black modules of the first kind in modular multilevel converter valve at this time, and permission unlock instruction can be issued by control module 8, enable
Flexible direct current system continues unlock operation.
Compared with prior art, using the control protective unit of flexible direct current system provided by the present embodiment, Ke Yizhun
Whether there is or not the black modules of the second class to generate during really identifying the stoppage in transit of flexible direct current system, and then on the one hand ensure that flexible direct current system
On the other hand the safe and stable operation of system improves the availability of modular multilevel converter valve in flexible direct current system.
Further, as shown in fig. 6, the control protective unit of flexible direct current system provided by the present embodiment may also include
The information deletion module 9 being connected with memory module 6, information deletion module 9 are also connected with multiple power modules 1 respectively, and information is deleted
Except module 9 is also connected with the memory module 6.
It, can be to the run the period in preceding one action period in the stoppage in transit period of the current operating cycle of flexible direct current system
Some or all of detected black module is overhauled, for avoid it is subsequent to fisrt feature information and second feature information into
Row is judged by accident when comparing, and information deletion module 9 can control memory module according to the corresponding characteristic information of black module after maintenance
The 6 corresponding characteristic information of black module after deleting maintenance in fisrt feature information.
Illustratively, when fisrt feature information is the total number information of black module, after being overhauled to black module, letter
Memory module 6 can be controlled for total of the black module recorded according to the number information of the black module after maintenance by ceasing removing module 9
Number deducts the number of the black module after maintenance；When fisrt feature information is the location information of each black module, to black module
After being overhauled, information deletion module 9 can be according to the location information of the black module after maintenance, and controlling memory module 6 will be after maintenance
The location information of black module deleted from the location information of each black module included by fisrt feature information.
Further, referring again to Fig. 6, the control protective unit of flexible direct current system provided by the present embodiment may be used also
Including information adding module 10.Information adding module 10 is connected with multiple power modules 1 respectively, information adding module 10 also with deposit
Module 6 is stored up to be connected.
It, can also be to the function in modular multilevel converter valve in the stoppage in transit period of the current operating cycle of flexible direct current system
Rate module 1 checked, when discovery has power module 1 there are when security risk, to avoid this Partial Power module 1 flexible straight
Streaming system run the period is damaged, and leads to the irregular operation of flexible direct current system, can exist during stoppage in transit to this part
The power module 1 of security risk is bypassed.For avoid it is subsequent fisrt feature information and second feature information are compared when
It judges by accident, information adding module 10 can control memory module 6 first according to the characteristic information of the power module 1 after bypass
The characteristic information of power module 1 in characteristic information after addition bypass.
Illustratively, when fisrt feature information is the total number information of black module, to there are the power of security risk
After module 1 is bypassed, information adding module 10 can control memory module 6 according to the number information for the power module 1 being bypassed
The number for the power module 1 being bypassed is added in the total number of the black module recorded；When fisrt feature information is each
When the location information of black module, after bypassing to the power module 1 there are security risk, information adding module 10 can basis
The location information for the power module 1 being bypassed is added to by the location information for the power module 1 being bypassed, control memory module 6
In fisrt feature information.
The foregoing is merely a specific embodiment of the invention, 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 with the scope of protection of the claims
It is quasi-.
Claims (6)
1. a kind of control guard method of flexible direct current system, which is characterized in that the duty cycle of the flexible direct current system wraps
Include period of stopping transport, starting charge period and run the period；The control guard method of the flexible direct current system includes:
Step S1: in the run the period in the preceding one action period of flexible direct current system, the more level converter valves of detection moduleization
The black module being bypassed, and record the fisrt feature information of detected black module；
The black module be can not it is normal on send the power module of status information；
Step S2: in the stoppage in transit period of the current operating cycle of the flexible direct current system, the fisrt feature information is carried out
Storage；
Step S3: in the starting charge period of the current operating cycle of the flexible direct current system, how electric the modularization is detected
Black module present in flat converter valve records and stores the second feature information of detected black module；It is special by described first
Reference breath is compared with the second feature information, judge the fisrt feature information and the second feature information whether one
It causes；If so, issuing permission unlock instruction；Forbid unlock instruction if it is not, issuing.
2. the control guard method of flexible direct current system according to claim 1, which is characterized in that the step S2 is also wrapped
Include: black module some or all of detected by the run the period to the preceding one action period of the flexible direct current system into
Row maintenance, and the corresponding characteristic information of black module after maintenance is deleted from the fisrt feature information stored.
3. the control guard method of flexible direct current system according to claim 1, which is characterized in that the step S2 is also wrapped
It includes: part power module in the modular multilevel converter valve is bypassed, and by the feature of the power module after bypass
Information increases in stored fisrt feature information.
4. a kind of control protective unit of flexible direct current system, which is characterized in that including characteristic information identification module, storage mould
Block, comparison module and control module；
Wherein, the characteristic information identification module is connected with multiple power modules in modular multilevel converter valve respectively；In
The run the period in the preceding one action period of the flexible direct current system, the characteristic information identification module is for detecting the mould
The black module being bypassed in the more level converter valves of blockization, and the fisrt feature information of detected black module is recorded；
The black module be can not it is normal on send the power module of status information；
The memory module is connected with the characteristic information identification module；In the current operating cycle of the flexible direct current system
It stops transport the period, the fisrt feature information that the memory module is used to record the characteristic information identification module stores；
In the starting charge period of the current operating cycle of the flexible direct current system, the characteristic information identification module is also used to
The black module in the modular multilevel converter valve is detected, and the second feature information of detected black module is remembered
Record；The memory module is also used to store the second feature information that the characteristic information identification module is recorded；
The comparison module is connected with the memory module and the control module respectively；In the current of the flexible direct current system
The starting charge period of duty cycle, the comparison module are used for the fisrt feature information that is stored the memory module and the
Two characteristic informations are compared, and judge whether the fisrt feature information and the second feature information are consistent；If so, passing through
The control module issues permission unlock instruction；Forbid unlock instruction if it is not, issuing by the control module.
5. the control protective unit of flexible direct current system according to claim 4, which is characterized in that further include information deletion
Module, the information deletion module are connected with multiple power modules respectively, the information deletion module also with the storage
Module is connected；In the stoppage in transit period of the current operating cycle of the flexible direct current system, when to the operation in preceding one action period
After black module some or all of detected by section is overhauled, the information deletion module is for controlling the memory module
The corresponding characteristic information of black module after deleting maintenance in the fisrt feature information.
6. the control protective unit of flexible direct current system according to claim 4, which is characterized in that further include information addition
Module, the information adding module are connected with multiple power modules respectively, the information adding module also with the storage
Module is connected；In the stoppage in transit period of the current operating cycle of the flexible direct current system, to the modular multilevel converter valve
In Partial Power module bypassed after, the information adding module is for controlling the memory module in the fisrt feature
The characteristic information of power module in information after addition bypass.
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Cited By (1)
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| US11881765B2 (en) | 2020-01-28 | 2024-01-23 | Siemens Energy Global GmbH & Co. KG | Method for operating a modular multilevel converter, and modular multilevel converter |
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| CN110994558B (en) * | 2019-12-04 | 2022-03-29 | 南京南瑞继保电气有限公司 | Black module judgment processing method and device |
| CN111638419B (en) * | 2020-07-07 | 2022-09-13 | 南方电网科学研究院有限责任公司 | Flexible direct-current black module test method and device |
| CN113904573B (en) * | 2021-10-13 | 2023-10-27 | 山东大学 | Half-bridge improved MMC submodule topological structure and control method thereof |
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