CN209526520U - The soft straight transmission system of multiterminal and the united power supply system of AC network - Google Patents
The soft straight transmission system of multiterminal and the united power supply system of AC network Download PDFInfo
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- CN209526520U CN209526520U CN201920650948.XU CN201920650948U CN209526520U CN 209526520 U CN209526520 U CN 209526520U CN 201920650948 U CN201920650948 U CN 201920650948U CN 209526520 U CN209526520 U CN 209526520U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The utility model relates to combine power supply technique field, a kind of soft straight transmission system of multiterminal and the united power supply system of AC network are specifically disclosed, and power supply system includes continent major network system, the first passive network system, the second passive network system, the first breaker, the first communication channel, the second communication channel, first change of current and the second converter station.Power supply system provided by the utility model utilizes AC network backup power automatic switching function, optimize the cooperation of flexible HVDC transmission system and AC network, in a communication channel outage, still it is able to maintain a main standby reliable power supply, reduce the reliability that passive power grid power supply is improved because a certain element fault causes the risk of passive grid power blackout.
Description
Technical field
The utility model relates to combine power supply technique field more particularly to a kind of soft straight transmission system of multiterminal and AC network
United power supply system.
Background technique
Flexible DC transmission technology, be it is a kind of by can New Technologies of Electric Power Transmission based on self-turn-off device, be of new generation high
Press HVDC Transmission Technology.Compared to conventional high-tension direct current transportation, flexible DC transmission is in all advantages with customary DC
Meanwhile also having that power flow reversion is fast, it is fast to restore after failure, can black starting-up and there is no commutation failure problem etc. is many excellent
Point, and evaded big harmonic wave and the problems such as need reactive power support.Although the development of flexible direct current technology and popularization are very swift and violent,
AC network will also exist, and the two will face and how cooperate with the AC network of current main-stream to long-term co-existence
Problem.
Currently, the course of work of flexible HVDC transmission system is as follows: condition checkout gear is arranged in each AC Substation
Active power and position of the switch information to associated AC element carry out real-time monitoring, and will test result and report to flexible direct current
Converter station；Flexible direct current converter station is exchanged according to the position of the switch information automatic identification for the communication elements sent in each AC Substation
Channel status；Once communication channel state changes, flexible HVDC transmission system will automatically switch operational mode and be handed over cooperating
The operation of galvanic electricity net.
Undertaking passive power grid together for Multi-end flexible direct current transmission system and two and the above communication channel, (such as wind-force is sent out
Power station, photo-voltaic power generation station, load side etc.) electric energy transmission electric system, it is this by flexible direct current converter station automatically switch run
The fit system of mode can be such that the reliability of entire electric system reduces, the reason is as follows that: when wherein a communication channel is stopped transport,
Electric system can turn by Multi-end flexible direct current transmission system and another communication channel common transport electric energy, once one only remained
Communication channel breaks down tripping, and the operational mode of flexible HVDC transmission system will be switched to " pure by " alternating current-direct current paired running "
DC operation ", there are the risks of handover failure for this handoff procedure.If operational mode handover failure, flexible HVDC transmission system
Also will tripping, passive power grid is by the whole network decompression.
Utility model content
One purpose of the utility model is, provides a kind of soft straight transmission system of multiterminal and powers in combination with AC network
System can propose the power supply reliability for effectively improving multiterminal soft straight transmission system and the united power supply system of AC network, effectively
Prevent the whole network decompression.
To achieve these objectives, the utility model, which provides a kind of soft straight transmission system of multiterminal and powers in combination with AC network, is
System, comprising:
Continent major network system, the continent major network system include the first major network AC Substation conducted and the second major network
AC Substation；
First passive network system, the first passive network system include first passive for connecting with the first load
AC Substation；
Second passive network system, the second passive network system include second passive for connecting with the second load
AC Substation；
First breaker, the first passive AC Substation passive are exchanged by first breaker with described second
Substation's conducting；
First communication channel, the first passive AC Substation pass through first communication channel and first major network
AC Substation conducting, first communication channel include the second breaker；
Second communication channel, the second passive AC Substation pass through second communication channel and second major network
AC Substation conducting, second communication channel includes third breaker；
First converter station, first converter station are conducted with the second major network AC Substation；
Second converter station, second converter station are conducted with the described first passive AC Substation.
Preferably, further includes:
Several third converter stations；
Remittance line bus, the third converter station are conducted by the remittance line bus and first converter station.
Preferably, further includes: dc circuit breaker, the third converter station are female by the dc circuit breaker and the remittance line
Line conducts.
Preferably, second converter station is conducted by the remittance line bus and first converter station.
It powers in combination the utility model has the beneficial effects that: providing a kind of soft straight transmission system of multiterminal with AC network
System optimizes the cooperation of flexible HVDC transmission system and AC network using AC network backup power automatic switching function, exchanges at one
Channel outage is still able to maintain a main standby reliable power supply, reduces because a certain element fault causes passive grid power blackout
Risk improves the reliability of passive power grid power supply.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the structural block diagram of multiterminal soft straight transmission system and the united power supply system of AC network that embodiment provides.
In figure:
1, continent major network system；101, the first major network AC Substation；102, the second major network AC Substation；
2, the first passive network system；201, the first passive AC Substation；
3, the second passive network system；301, the second passive AC Substation
4, the first converter station；
5, the second converter station；
6, third converter station；
7, the first breaker；
8, the first communication channel；801, the second breaker；
9, the second communication channel；901, third breaker；
10, remittance line bus；
11, dc circuit breaker.
Specific embodiment
It is practical below in conjunction with this to enable the purpose of this utility model, feature, advantage more obvious and understandable
Attached drawing in new embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that under
The described embodiments are only a part of the embodiments of the utility model in face, and not all embodiment.Based on the utility model
In embodiment, all other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, fall within the protection scope of the utility model.
In the description of the present invention, it should be understood that when a component is considered as " connection " another component,
It can be directly to another component or may be simultaneously present the component being centrally located.When a component is considered as
" setting exists " another component, it, which can be, is set up directly on another component or may be simultaneously present the group being centrally located
Part.
In addition, the indicating positions such as term " length " " short " "inner" "outside" or positional relationship for the orientation that is shown based on attached drawing or
Person's positional relationship is merely for convenience of description the utility model, rather than the device or original part of indication or suggestion meaning must have
There is this specific orientation, operated with specific orientation construction, should not be understood as the limitation of the utility model with this.
Further illustrate the technical solution of the utility model below with reference to the accompanying drawings and specific embodiments.
The present embodiment provides a kind of soft straight transmission systems of multiterminal and the united power supply system of AC network and method of supplying power to, can
To propose the power supply reliability for effectively improving multiterminal soft straight transmission system and the united power supply system of AC network, it effectively prevent the whole network
Decompression.
Referring to Fig. 1, the soft straight transmission system of multiterminal and the united power supply system of AC network, including continent major network system 1, the
One passive network system 2, the second passive network system 3, the first breaker 7, the first communication channel 8, the second communication channel 9,
One change of current and the second converter station 5.
The continent major network system 1 includes that the first major network AC Substation 101 conducted exchanges power transformation with the second major network
Stand 102；The first passive network system 2 includes the first passive AC Substation 201 for connecting with the first load；It is described
Second passive network system 3 includes the second passive AC Substation 301 for connecting with the second load；The first passive friendship
Rheology power station 201 is connected by first breaker 7 and the described second passive AC Substation 301；The first passive friendship
Rheology power station 201 is connected by first communication channel 8 with the first major network AC Substation 101, first exchange
Channel 8 includes the second breaker 801；The second passive AC Substation 301 passes through second communication channel 9 and described the
The conducting of two major network AC Substations 102, second communication channel 9 include third breaker 901；First converter station 4 with
The second major network AC Substation 102 conducts；Second converter station 5 and the described first passive 201 electricity of AC Substation
Conducting.Preferably, the first passive AC Substation 201 and the second passive AC Substation 301 are respectively connected with wind power plant.
Power supply system further includes several third converter stations 6 and a remittance line bus 10.The third converter station 6 passes through described
The line bus 10 that converges is conducted with first converter station 4.Second converter station 5 passes through the remittance line bus 10 and described first
Converter station 4 conducts.
Power supply system further includes dc circuit breaker 11, the third converter station 6 by the dc circuit breaker 11 with it is described
The line bus 10 that converges conducts.
Power supply system provided in this embodiment uses a kind of method of supplying power to, when first communication channel 8 has a power failure for some reason,
The method of supplying power to includes power failure operation and telegram in reply operation.
Specifically, the main thought of method of supplying power to is as follows:
When communication channel outage for some reason, by multiple passive power grid parallel runnings of the soft direct-furnish electric system of multiterminal
(such as passive power grid is in parallel, then skips this step), another available communication channel, which disconnects, is used as extension wire, soft by multiterminal
Property DC transmission system the both-end method of operation (only have both ends operation), electric energy biography is carried out to the passive power grid after merging alone
It is defeated.
When the first communication channel 8 has a power failure, if the soft direct power supply system jam tripping of multiterminal, the second passive exchange become
Movement is closed extension wire by the prepared auto restart in power station 301, and passive power grid turns to be powered by spare communication channel.Second communication channel
When 9 power failure, if soft straight system jam tripping, the prepared auto restart of the first passive AC Substation 201 closes movement spare
Route, passive power grid turn to be powered by spare communication channel.In a communication channel outage, it is standby to be still able to maintain one main one
Reliable power supply.The reliability of passive power grid power supply can be improved using this strategy.
It describes in detail by taking the power failure of the first communication channel 8 as an example below, the Cooperation Strategy of the second communication channel 9 is similar.
S10: the power failure operation includes:
S101: Multi-end flexible direct current transmission system is switched into the both-end method of operation by the multiterminal method of operation；
Specifically, S101 can divide following two situation:
1. 6 DC side of third converter station has dc circuit breaker 11, make third converter station 6 by operating dc circuit breaker 11
It is disconnected with remittance line bus 10, to realize exiting online for third converter station 6；
2. 6 DC side of third converter station does not have dc circuit breaker 11, in the environment of actual motion, many converter stations are not
It is equipped with dc circuit breaker 11, flexible HVDC transmission system can be stopped transport at this time, then restart to both-end operational mode.
S102: the backup auto-activating device operation setting of the second passive AC Substation 301 of confirmation is normal；
Specifically, the scope of examination includes:
1. confirming backup auto-activating device normal operation；
2. confirmation backup auto-activating device does not put into " higher level's cutting load is latched backup power automatic switching function ", must be exited if any investment.
S103: the target value of " determining active power " is set for the second converter station 5；
Specifically, " trend automatic control " is to efficiently use flexible HVDC transmission system and transmitting intermittent new energy
A kind of real power control strategy of aspect advantage, principle be by flexible HVDC transmission system transmitting active power as much as possible,
To reduce the active power of alternating current circuit transmission.The first breaker 7 will be closed in subsequent operation, by the first passive network system
2 and second passive 3 parallel running of network system, " trend automatic control " soft pressing plate of passive grid side converter station will move back automatically
Out, active power controller strategy switchs to " determining real power control ", and active power will be transmitted with setting value, no longer voluntarily by system
Control.The impact of active power in subsequent operation can be reduced to the reasonable set of " determining active power " target value.
S104: make the first passive network system 2 and the second passive 3 parallel running of network system；
Specifically, the S104 includes:
1. closing the first breaker 7, make the first passive network system 2 and the second passive power grid parallel running；
2. " trend automatic control " soft pressing plate of confirmation second side converter station has dropped out.
S105: the second communication channel 9 is switched into stand-by state；
Specifically, the S105 includes:
1. disconnecting third breaker 901；
2. confirming the second passive 301 backup auto-activating device of AC Substation connected as the second spare communication channel 9
Charging is normal.
S106: the target value of " the determining active power " of the second converter station 5 of adjustment；
Specifically, " determining active power " target value of the second converter station 5 is adjusted, the communication channel having a power failure will be prepared as far as possible
Power control is " 0 ".It is " 0 " by the power control for preparing the communication channel having a power failure, soft lineal system can be reduced by " AC/DC parallel
Operation " is switched to impact when " pure DC operation ".
S107: the first communication channel 8 is switched into inspecting state；
Specifically, the S107 includes:
1. disconnecting the second breaker 801；
2. confirming that the second converter station 5 is switched to " pure DC operation " via " AC/DC parallel operation "；
3. confirming that the backup auto-activating device operation setting of the second passive AC Substation 301 is normal；
4. the first communication channel 8 is switched to inspecting state.
S20: the telegram in reply, which operates, includes:
S201: the first communication channel 8 is resumed operation；
Specifically, the S201 includes:
1. the first communication channel 8 is switched to operating status；
2. confirming that the second converter station 5 is switched to " AC/DC parallel operation " by " pure DC operation ".
S202: the second communication channel 9 is resumed operation；
Specifically, it is closed third breaker 901, replys the second communication channel 9.
S203: " trend automatic control " soft pressing plate of the second converter station 5 of investment；
S204: make the first passive network system 2 and the second passive 3 fanout operation of network system；
Specifically, the S204 includes:
1. disconnecting the first breaker 7；
2. confirming that the backup auto-activating device charging of the second passive AC Substation 301 is normal.
S205: Multi-end flexible direct current transmission system is switched into the multiterminal method of operation by the both-end method of operation.
Specifically, S205 can divide following two situation:
1. 6 DC side of third converter station has dc circuit breaker 11, make third converter station 6 by operating dc circuit breaker 11
It is connected with remittance line bus 10, to realize the online arranged side by side of third converter station 6；
2. 6 DC side of third converter station does not have dc circuit breaker 11, in the environment of actual motion, many converter stations are not
It is equipped with dc circuit breaker 11, flexible HVDC transmission system can be stopped transport at this time, then restart to multiterminal operational mode.
Specifically, operation is completed, and the soft direct-furnish electric system of multiterminal is restored to day-to-day operation mode as shown in Figure 1.
Power supply system provided in this embodiment is suitable for Multi-end flexible direct current transmission system and two and the above communication channel
The electric system of passive power grid (such as wind power station, photo-voltaic power generation station, load side) electric energy transmission is undertaken together.Such power grid
When having alternating current circuit power failure, according to the method for operation of adjustment AC network and soft direct-furnish electric system, and it is standby certainly using AC network
Function is thrown, electric network reliability is improved.
Power supply system provided in this embodiment and method of supplying power to utilize AC network backup power automatic switching function, optimize flexible direct current
The cooperation of transmission system and AC network is still able to maintain a main standby reliable power supply, subtracts in a communication channel outage
Less because a certain element fault causes the risk of passive grid power blackout, the reliability of passive power grid power supply is improved.
Above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；Although referring to aforementioned reality
Example is applied the utility model is described in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and model of various embodiments of the utility model technical solution that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (4)
1. a kind of soft straight transmission system of multiterminal and the united power supply system of AC network characterized by comprising
Continent major network system (1), the continent major network system (1) include the first major network AC Substation (101) conducted and
Second major network AC Substation (102)；
First passive network system (2), the first passive network system (2) include the first nothing for connecting with the first load
Source AC Substation (201)；
Second passive network system (3), the second passive network system (3) include the second nothing for connecting with the second load
Source AC Substation (301)；
First breaker (7), the first passive AC Substation (201) pass through first breaker (7) and described second
Passive AC Substation (301) conducting；
First communication channel (8), the first passive AC Substation (201) by first communication channel (8) with it is described
The conducting of first major network AC Substation (101), first communication channel (8) include the second breaker (801)；
Second communication channel (9), the second passive AC Substation (301) by second communication channel (9) with it is described
The conducting of second major network AC Substation (102), second communication channel (9) includes third breaker (901)；
First converter station (4), first converter station (4) conduct with the second major network AC Substation (102)；
Second converter station (5), second converter station (5) conduct with the described first passive AC Substation (201).
2. the soft straight transmission system of multiterminal according to claim 1 and the united power supply system of AC network, which is characterized in that
Further include:
Several third converter stations (6)；
It converges line bus (10), the third converter station (6) passes through the remittance line bus (10) and the first converter station (4) conductance
It is logical.
3. the soft straight transmission system of multiterminal according to claim 2 and the united power supply system of AC network, which is characterized in that
Further include:
Dc circuit breaker (11), the third converter station (6) pass through the dc circuit breaker (11) and the remittance line bus (10)
It conducts.
4. the soft straight transmission system of multiterminal according to claim 3 and the united power supply system of AC network, which is characterized in that
Second converter station (5) is conducted by the remittance line bus (10) with first converter station (4).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950906A (en) * | 2019-05-06 | 2019-06-28 | 广东电网有限责任公司 | The soft straight transmission system of multiterminal and the united power supply system of AC network and method of supplying power to |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950906A (en) * | 2019-05-06 | 2019-06-28 | 广东电网有限责任公司 | The soft straight transmission system of multiterminal and the united power supply system of AC network and method of supplying power to |
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