CN108879625A - A kind of parallel connection multiterminal extra-high voltage direct-current transmission valve unit protection action processing method - Google Patents
A kind of parallel connection multiterminal extra-high voltage direct-current transmission valve unit protection action processing method Download PDFInfo
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- CN108879625A CN108879625A CN201810793578.5A CN201810793578A CN108879625A CN 108879625 A CN108879625 A CN 108879625A CN 201810793578 A CN201810793578 A CN 201810793578A CN 108879625 A CN108879625 A CN 108879625A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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Abstract
The present invention discloses a kind of multiterminal extra-high voltage direct-current transmission valve unit protection action processing method in parallel：Movement valve unit protection takes movement valve unit protection only the inverter group of block action inverter group and the same pole of other converter stations still maintains original valve group operation number and continues to run according to acting converter station number difference extremely in operating status in multiterminal extra-high voltage DC transmission system in parallel, or movement valve group protection blocking movement valve group and a valve group for being latched other same pole inverter groups of all converter stations in operating status simultaneously.Such technical solution can realize the influence of the maximum power transfer and reduction movement valve unit protection of multiterminal extra-high voltage DC transmission system same pole residue valve group in parallel to other converter stations after a certain valve unit protection movement of a certain converter station of multiterminal extra-high voltage direct-current transmission in parallel.
Description
Technical field
The invention belongs to multiterminal extra-high voltage direct-current transmission in parallel field, including multiterminal routine extra-high voltage direct-current transmission in parallel,
Multiterminal mixing extra-high voltage direct-current transmission in parallel and multiterminal flexibility extra-high voltage direct-current transmission in parallel, in particular to a kind of parallel connection are more
Hold extra-high voltage direct-current transmission valve unit protection action processing method.
Background technique
Multi-terminal direct current transmission system in parallel has just been applied in the U.S. and Canadian networking project early in eighties of last century.
When having several drop points on a transmission of electricity corridor, multi-terminal direct current transmission system in parallel is because a transmission line of electricity can be saved
And most probably become optimal selection.
Multi-terminal direct current transmission system in parallel, as the term suggests it is exactly that the inverter of each converter station same pole is connected across greatly
The DC transmission system of converter station parallel-connection structure is formed between ground and DC power transmission line.Multi-terminal direct current transmission system in parallel is pressed
The inverter number for being included according to voltage class or each each pole in station can be divided into multiterminal HVDC transmission system in parallel
With multiterminal extra-high voltage DC transmission system in parallel.Multiterminal HVDC transmission system in parallel refers to that each each pole in station contains only one
The DC transmission system of inverter valve group；Multiterminal extra-high voltage DC transmission system in parallel refer to each pole in each station contain there are two and two
A concatenated DC transmission system of the above valve group, Fig. 1 are exactly that there are two the N that inverter valve group is connected in series for each each pole in station
Hold extra-high voltage DC transmission system in parallel.
When the valve unit protection movement of multiterminal HVDC transmission system in parallel station, because each each pole in station only has one
A valve group, so multiterminal HVDC transmission system in parallel takes locking our station failure valve group or locking our station defective valves at this time
Pole where group is identical blocking method.When the valve unit protection locking of multiterminal extra-high voltage DC transmission system in parallel station, because
For each pole in each station there are two and more than two valve groups be connected in series, so take at this time locking our station failure valve group and its
Pole where one valve group or locking our station failure valve group of its all converter station same pole is two different methods.
As multiterminal extra-high voltage DC transmission system in parallel converter station number in operating status is different, multiterminal in parallel
The above two valve unit protection action processing method of extra-high voltage DC transmission system has on ensureing whole system transmission power ability
Very big difference, therefore study multiterminal extra-high voltage DC transmission system valve unit protection action processing method in parallel to improving simultaneously
The reliability and ability to transmit electricity for joining multiterminal extra-high voltage DC transmission system have vital effect.
However it is defeated to concentrate on both ends direct current to multiterminal extra-high voltage direct-current transmission valve unit protection action processing method in parallel at present
Electric system, the action processing method taken after valve unit protection movement are all locking failure valve groups and are latched simultaneously another
One valve group of converter station.
Chinese patent CN101741082B proposes the extra-high voltage direct-current serial valve group side of exiting under the conditions of no interior communication
Method, this patent are conceived to both ends extra-high voltage DC transmission system, each station when valve unit protection acts or normally exits valve group
A valve group is exited, another valve group continues to run.Chinese patent CN107453388A《The valve of Hybrid HVDC system
Group ESOF control method and Hybrid HVDC system》Refer to multi-terminal direct current transmission system valve group ESOF locking failure valve group
Method, but do not relate to valve group ESOF locking failure valve group where pole method.
In conclusion the research of parallel connection multiterminal extra-high voltage DC transmission system valve unit protection blocking method is all focused at present
In the level of valve unit protection locking defective valves, this method is transported at 3 ends and 3 end more parallel multiterminal extra-high voltage DC transmission systems
More transmission powers can be lost than pole where locking failure valve group when row, and directly affect other all changes of current
The operating status stood.Therefore there is significant limitation in multiterminal extra-high voltage direct-current transmission in parallel field, the present invention is by moving party
Method solves the problems, such as this.
Summary of the invention
The purpose of the present invention is to provide a kind of multi-terminal direct current transmission system valve unit protection action processing method in parallel,
It can be after the protection act of a valve group of certain one pole in station by taking different locking strategies to realize that multiterminal in parallel are extra-high
Press the maximum power transfer of the same extremely remaining valve group of DC transmission system.
In order to achieve the above objectives, solution of the invention is：
A kind of parallel connection multiterminal extra-high voltage direct-current transmission valve unit protection action processing method, the method are：Valve group is acted to protect
Root guard takes movement according to converter station number difference extremely in operating status is acted in multiterminal extra-high voltage DC transmission system in parallel
The inverter group of valve unit protection only block action inverter group and the same pole of other converter stations still maintains original valve group operation
Number continues to run, or movement valve group protection blocking movement valve group is simultaneously latched other all in operating status change simultaneously
One valve group of the same pole inverter group in stream station；
Wherein,
The movement valve group：When the faulty generation of valve group, the valve unit protection to protect the valve group and being arranged can be acted,
And faulty valve group is known as acting valve group；The protection, which is referred to as, acts valve unit protection；
The movement pole：After valve unit protection movement, the pole comprising acting valve group is known as acting pole；
The movement station：After valve unit protection movement, the converter station comprising acting valve group is known as acting station；
The movement inverter group：After valve unit protection movement, the inverter group comprising acting valve group is known as acting changing
Flow device group.
Further, the above method specifically includes：
Step 1：After valve unit protection movement, calculates multiterminal extra-high voltage DC transmission system movement in parallel pole and be in operation
The converter station number of state；
Step 2：Sufficient criterion is packed for the moment when converter station number in operating status is greater than 3 and acts, the operating valve
Group protection blocking movement valve group is simultaneously latched one of other same pole inverter groups of all converter stations in operating status simultaneously
Valve group；
Step 3：Criterion is not met for the moment when converter station number in operating status is greater than 3 and acts station, the movement
Valve unit protection block action inverter group, the inverter group of other same poles of converter station still maintain original valve group operation number
Mesh continues to run；
Step 4：Meet when converter station number in operating status is equal to 3 and acts inverter group transmission power value
When criterion two, which acts inverter group, and the inverter group of other same poles of converter station still maintains former
The valve group operation number come continues to run；
Step 5：When converter station number in operating status is equal to 3 and to act inverter group transmission power value less than
When sufficient criterion two, movement valve group protection blocking movement valve group is simultaneously latched other all converter stations in operating status simultaneously
One valve group of same pole inverter group；
Step 6：When converter station number in operating status is equal to 2, which acts valve group simultaneously
It is latched a valve group of other same pole inverter groups of all converter stations in operating status simultaneously.
Wherein, the adequate condition of sufficient criterion one is packed in movement is：Acting station is multiterminal extra-high voltage DC transmission system in parallel
Unique converting plant in operating status or unique Inverter Station in operating status.Act inverter group transmission power
The adequate condition that value meets criterion two is：Act inverter group transmission power be less than the same extremely all converting plants of whole system or
The half of all Inverter Station transmission power summations of person.
The beneficial effects of the invention are as follows：
It is all block action valve group after traditional both ends extra-high voltage DC transmission system valve unit protection movement, it is this dynamic
Very big transmission power loss can be generated in multiterminal extra-high voltage direct-current transmission in parallel field and influence same pole institute by dealing with method
There is the operating status of operation converter station.The present invention is closed by acting different take of converter station number extremely in operating status
Lock acts the action processing method of valve group or block action inverter group, can realize after the movement of a certain valve unit protection surplus
The maximum power transfer of remaining parallel connection multiterminal extra-high voltage DC transmission system and reduction act valve unit protection to the shadow of other converter stations
It rings.
Detailed description of the invention
Fig. 1 is N-terminal extra-high voltage DC transmission system structure chart in parallel；
Fig. 2 is N-terminal extra-high voltage DC transmission system valve unit protection action processing method flow chart in parallel；
Fig. 3 is N-terminal extra-high voltage DC transmission system movement valve group protection blocking movement inverter group schematic diagram 1 in parallel；
Fig. 4 is N-terminal extra-high voltage DC transmission system movement valve group protection blocking movement valve group schematic diagram 1 in parallel；
Fig. 5 is N-terminal extra-high voltage DC transmission system movement valve group protection blocking movement inverter group schematic diagram 2 in parallel；
Fig. 6 is N-terminal extra-high voltage DC transmission system movement valve group protection blocking movement valve group schematic diagram 2 in parallel.
Fig. 7 is N-terminal extra-high voltage DC transmission system movement valve group protection blocking movement valve group schematic diagram 3 in parallel.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention is described in detail, so that those skilled in the art can
To better understand the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
The proper noun that this patent is related to is explained as follows：
Valve group：Refer to and converts alternating current to direct current in multi-terminal high-voltage or extra-high voltage DC transmission system in parallel and incite somebody to action
DC conversion at alternating current the convertor unit being installed in independent valve hall.
Valve unit protection：It is the logic with action processing method protecting valve group and being arranged according to certain principle.
Valve unit protection device：Device comprising a variety of valve unit protections.
Act valve group：When the faulty generation of valve group, the valve unit protection to protect the valve group and being arranged can be acted, and have
The valve group of failure, which is referred to as, acts valve group；The protection, which is referred to as, acts valve unit protection.
Pole：The general name of one DC line and the equipment being connected in parallel between this DC line and the earth.Multiterminal in parallel
In extra-high voltage DC transmission system, two poles are generally divided into, are as shown in figure 1 pole one in solid box, remaining part is pole two.
Act pole：After valve unit protection movement, the pole comprising acting valve group, which is referred to as, acts pole.
Movement station：After valve unit protection movement, the converter station comprising acting valve group, which is referred to as, acts station.
Inverter group：Belong to the summation of all valve groups of a certain pole in one converter station.
Act inverter group：After valve unit protection movement, the inverter group comprising acting valve group, which is referred to as, acts the change of current
Device group.
Fig. 1 is typical multiterminal extra-high voltage DC transmission system figure in parallel：Whole system includes converter station 1, converter station
2 ..., converter station N-1, converter station N are total to N number of converter station；Each converter station includes two inverter groups, two inverter groups
The wired earth for being connected by conducting wire, and two inverter groups being connected；Each each inverter group of converter station includes valve group 1
With totally two valve groups of valve group 2, two valve groups formed cascaded structures be connected across each pole DC line and earthing pole lead it
Between；The inverter group for belonging to pole 1 of converter station N number of in this way and the inverter group for belonging to pole 2 form respectively parallel-connection structure.
Both ends protection of extra-high voltage DC power transmission system includes pole protection and valve unit protection, the wherein protection of pole protection at present
Range includes all other equipment in addition to valve group, such as DC bus, DC line, earthing pole etc.；Valve unit protection includes valve
1 protection of group and valve group 2 are protected, and the protection of two valve groups is mutually indepedent；When pole protection act, the processing method of protection is exactly
Locking pole is gone to, when 1 protection act of valve group, the processing method of protection act is locking valve group 1, but still allows valve group 2 after reforwarding
Row, with should 2 protection act of valve group when, the processing method of protection act be locking valve group 2, but still allow valve group 1 after reforwarding
Row.
Implementation flow chart of the present invention as shown in Figure 2 includes the following steps：
A kind of parallel connection multiterminal extra-high voltage direct-current transmission valve unit protection action processing method, it is characterised in that：Valve group is acted to protect
Root guard carries out not according to converter station number difference extremely in operating status is acted in multiterminal extra-high voltage DC transmission system in parallel
Same action processing method, includes the following steps：
Step 1：After valve unit protection movement, calculates multiterminal extra-high voltage DC transmission system movement in parallel pole and be in operation
The converter station number of state；
Step 2：Sufficient criterion is packed for the moment when converter station number in operating status is greater than 3 and acts, the operating valve
Group protection blocking movement valve group is simultaneously latched one of other same pole inverter groups of all converter stations in operating status simultaneously
Valve group；
Step 3：Criterion is not met for the moment when converter station number in operating status is greater than 3 and acts station, the movement
Valve unit protection block action inverter group, the inverter group of other same poles of converter station still maintain original valve group operation number
Mesh continues to run；
Step 4：Meet when converter station number in operating status is equal to 3 and acts inverter group transmission power value
When criterion two, which acts inverter group, and the inverter group of other same poles of converter station still maintains former
The valve group operation number come continues to run；
Step 5：When converter station number in operating status is equal to 3 and to act inverter group transmission power value less than
When sufficient criterion two, movement valve group protection blocking movement valve group is simultaneously latched other all converter stations in operating status simultaneously
One valve group of same pole inverter group；
Step 6：When converter station number in operating status is equal to 2, which acts valve group simultaneously
It is latched a valve group of other same pole inverter groups of all converter stations in operating status simultaneously.
Wherein, the adequate condition of sufficient criterion one is packed in movement is：Acting station is multiterminal extra-high voltage DC transmission system in parallel
Unique converting plant in operating status or unique Inverter Station in operating status.Act inverter group transmission power
The adequate condition that value meets criterion two is：Act inverter group transmission power be less than the same extremely all converting plants of whole system or
The half of all Inverter Station transmission power summations of person.
A specific embodiment of the invention is illustrated with specific example below.
Example one：
Assuming that multiterminal extra-high voltage DC transmission system in parallel has converter station 1, converter station 2, the change of current before valve unit protection movement
Standing, N-1, tetra- stations converter station N are in operating status, and wherein converter station 1, converter station 2 are converting plants；Converter station N-1, converter station
N is Inverter Station.After 1 pole of converter station, 11 protection act of valve group, because when the converter station number in operating status of pole 1 is equal to
4, and converter station 1 and converter station 2 are all converting plants, so 1 protection blocking converter station of valve group, 1 pole 1 of 1 pole 1 of converter station is changed
Flow device group.The inverter group of the pole 1 of converter station 2, converter station N-1, converter station N still maintain valve group 1 and 2 bivalve group of valve group after
Reforwarding row, as shown in Figure 3.
Example two：
Assuming that multiterminal extra-high voltage DC transmission system in parallel has converter station 1, converter station 2, the change of current before valve unit protection movement
Standing, N-1, tetra- stations converter station N are in operating status, and wherein converter station 1 is unique converting plant；Converter station 2, converter station N-1,
Converter station N is Inverter Station.After 1 pole of converter station, 11 protection act of valve group, because of the converter station number in operating status when pole 1
Mesh is equal to 4, and converter station 1 is unique converting plant, so 1 protection blocking converter station of valve group, 1 pole 1 of 1 pole 1 of converter station
Valve group 1, and it is latched a valve group of the 1 inverter group of pole of converter station 2, converter station N-1, converter station N simultaneously, so that converter station
1, the 1 inverter group of pole of converter station, converter station N-1, converter station N are with single valve group mode operation, as shown in Figure 4.
Example three：
Assuming that multiterminal extra-high voltage DC transmission system in parallel has converter station 1, converter station 2, the change of current before valve unit protection movement
Stand 3 totally three stations it is in operating status.Wherein converter station 1, converter station 2 are converting plants, and two stations pole, 1 inverter group conveys function
Rate is 400MW and 600MW respectively；Converter station 3 is Inverter Station, 1 inverter group transmission power 1000MW of pole.When 1 pole 1 of converter station
After 1 protection act of valve group, because the converter station number in operating status of pole 1 is equal to 3, and the inverter of 1 pole 1 of converter station
Group transmission power only has 400MW, and all converting plants of whole system or all Inverter Station transimission power summations are 1000MW,
So the inverter group of 1 protection blocking converter station of valve group, 1 pole 1 of 1 pole 1 of converter station, 1 change of current of pole of converter station 2 and converter station 3
Device group still maintains valve group 1 and 2 bivalve group of valve group continues to run, and such converter station 2 and converter station 3 are with the continuation of 600MW power
Operation, as shown in Figure 5.
Example four：
Assuming that multiterminal extra-high voltage DC transmission system in parallel has converter station 1, converter station 2, the change of current before valve unit protection movement
Stand 3 totally three stations it is in operating status.Wherein converter station 1, converter station 2 are converting plants, and two stations pole, 1 inverter group conveys function
Rate is 600MW and 400MW respectively；Converter station 3 is Inverter Station, 1 inverter group transmission power 1000MW of pole.When 1 pole 1 of converter station
After 1 protection act of valve group, because the converter station number in operating status of pole 1 is equal to 3, and the inverter of 1 pole 1 of converter station
Group transmission power has 600MW, and all converting plants of whole system or all Inverter Station transimission power summations are 1000MW, institute
With the valve group 1 of 1 protection blocking converter station of valve group, 1 pole, the 1 inverter group of 1 pole 1 of converter station and while being latched converter station 2 and the change of current
One valve group of 3 pole, 1 inverter group of standing, so that converter station 1 is to 1 inverter group of the pole of converter station 3 with single valve group mode power
500WM is continued to run, as shown in Figure 6.
Example five：
Assuming that multiterminal extra-high voltage DC transmission system in parallel has converter station 1, converter station 3 totally two before valve unit protection movement
It stands in operating status.Converter station 1 is converting plant, and converter station 3 is Inverter Station.After 1 pole of converter station, 11 protection act of valve group,
Because the converter station number in operating status of pole 1 is equal to 2,1 protection blocking converter station of valve group, 1 pole, 1 change of current of 1 pole 1 of converter station
The valve group 1 of device group and a valve group for being latched 3 pole of converter station, 1 inverter group simultaneously, so that the pole 1 of converter station 1 and converter station 3
Inverter group is with single valve group mode operation, as shown in Figure 7.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure made by bright specification and accompanying drawing content perhaps equivalent process transformation or is directly or indirectly used in other phases
The technical field of pass is included in scope of patent protection of the invention.
Claims (4)
1. a kind of parallel connection multiterminal extra-high voltage direct-current transmission valve unit protection action processing method, which is characterized in that the method is：It is dynamic
It is different according to converter station number extremely in operating status is acted in multiterminal extra-high voltage DC transmission system in parallel to make valve unit protection
The inverter group of movement valve unit protection only block action inverter group and the same pole of other converter stations is taken to still maintain original
Valve group operation number continues to run, or movement valve group protection blocking acts valve group and is latched simultaneously other all in operation shape
One valve group of the same pole inverter group of the converter station of state；
Wherein,
The movement valve group：When the faulty generation of valve group, the valve unit protection to protect the valve group and being arranged can be acted, and have event
The valve group of barrier is known as acting valve group；The protection, which is referred to as, acts valve unit protection；
The movement pole：After valve unit protection movement, the pole comprising acting valve group is known as acting pole；
The movement station：After valve unit protection movement, the converter station comprising acting valve group is known as acting station；
The movement inverter group：After valve unit protection movement, the inverter group comprising acting valve group is known as acting inverter
Group.
2. a kind of multiterminal extra-high voltage direct-current transmission valve unit protection action processing method in parallel according to claim 1, special
Sign is, specifically includes：
Step 1：After valve unit protection movement, it is extremely in operating status to calculate multiterminal extra-high voltage DC transmission system movement in parallel
Converter station number；
Step 2：Sufficient criterion is packed for the moment when converter station number in operating status is greater than 3 and acts, which protects
Shield block action valve group and a valve group for being latched other same pole inverter groups of all converter stations in operating status simultaneously；
Step 3：Criterion is not met for the moment when converter station number in operating status is greater than 3 and acts station, the movement valve group
Protection blocking acts inverter group, and the valve group operation number that the inverter group of other same poles of converter station still maintains original continues
Operation；
Step 4：Meet criterion two when converter station number in operating status is equal to 3 and acts inverter group transmission power value
When, which acts inverter group, and the inverter group of other same poles of converter station still maintains original valve
Group operation number continues to run；
Step 5：Do not meet criterion when converter station number in operating status is equal to 3 and acts inverter group transmission power value
When two, movement valve group protection blocking movement valve group is simultaneously latched other all same poles of converter station in operating status simultaneously and changes
Flow a valve group of device group；
Step 6：When converter station number in operating status is equal to 2, which acts valve group and simultaneously
It is latched a valve group of other same pole inverter groups of all converter stations in operating status.
3. a kind of multiterminal extra-high voltage direct-current transmission valve unit protection action processing method in parallel according to claim 2, special
Sign is that the adequate condition that sufficient criterion one is packed in movement is：Acting station is that multiterminal extra-high voltage DC transmission system in parallel is unique
Converting plant in operating status or unique Inverter Station in operating status.
4. a kind of multiterminal extra-high voltage direct-current transmission valve unit protection action processing method in parallel according to claim 2, special
Sign is that the adequate condition that movement inverter group transmission power value meets criterion two is：Movement inverter group transmission power is less than
The half of the same extremely all converting plants of whole system or all Inverter Station transmission power summations.
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|---|---|---|---|
| CN201810793578.5A CN108879625B (en) | 2018-07-19 | 2018-07-19 | A kind of parallel connection multiterminal extra-high voltage direct-current transmission valve unit protection action processing method |
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|---|---|---|---|
| CN201810793578.5A CN108879625B (en) | 2018-07-19 | 2018-07-19 | A kind of parallel connection multiterminal extra-high voltage direct-current transmission valve unit protection action processing method |
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| CN113629749A (en) * | 2020-05-09 | 2021-11-09 | 南京南瑞继保电气有限公司 | Single-station exiting method and device of multi-terminal direct-current power transmission system |
| CN115333098A (en) * | 2022-09-20 | 2022-11-11 | 中国南方电网有限责任公司超高压输电公司昆明局 | Method, device and equipment for sequential locking treatment of double valve banks of multi-terminal direct-current power transmission system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110729747A (en) * | 2019-09-27 | 2020-01-24 | 中国南方电网有限责任公司 | Valve bank locking processing method and device for multi-terminal extra-high voltage direct current transmission system |
| CN113629749A (en) * | 2020-05-09 | 2021-11-09 | 南京南瑞继保电气有限公司 | Single-station exiting method and device of multi-terminal direct-current power transmission system |
| CN113629749B (en) * | 2020-05-09 | 2023-09-08 | 南京南瑞继保电气有限公司 | Single-station exit method and device of multi-terminal direct current transmission system |
| CN115333098A (en) * | 2022-09-20 | 2022-11-11 | 中国南方电网有限责任公司超高压输电公司昆明局 | Method, device and equipment for sequential locking treatment of double valve banks of multi-terminal direct-current power transmission system |
| CN115333098B (en) * | 2022-09-20 | 2024-05-31 | 中国南方电网有限责任公司超高压输电公司昆明局 | Method, device and equipment for handling double valve group sequential locking of multi-terminal direct current transmission system |
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| CN108879625B (en) | 2019-09-27 |
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