CN109950906A - The soft straight transmission system of multiterminal and the united power supply system of AC network and method of supplying power to - Google Patents
The soft straight transmission system of multiterminal and the united power supply system of AC network and method of supplying power to Download PDFInfo
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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
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- 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 present invention relates to joint power supply technique fields, a kind of soft straight transmission system of multiterminal and the united power supply system of AC network and method of supplying power to 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 invention and method of supplying power to utilize 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 present invention relates to joint power supply technique fields more particularly to a kind of soft straight transmission system of multiterminal to combine with AC network
Power supply system and method for supplying power to.
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.
Summary of the invention
It is an advantage of the invention to provide a kind of soft straight transmission systems of multiterminal and the united power supply system of AC network
And method of supplying power to, it can mention and effectively improve the soft straight transmission system of multiterminal and the power supply of the united power supply system of AC network is reliable
Property, it effectively prevent the whole network decompression.
To achieve these objectives, on the one hand, the present invention provides a kind of soft straight transmission system of multiterminal and supplies in combination with AC network
Electric 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.
On the other hand, a kind of method of supplying power to is provided, the soft straight transmission system of any of the above-described kind of multiterminal and AC network are suitable for
United power supply system, when first communication channel has a power failure for some reason, the method for supplying power to includes power failure operation and telegram in reply behaviour
Make；
The power failure operation includes:
Multi-end flexible direct current transmission system is switched into the both-end method of operation by the multiterminal method of operation；
Confirm that the backup auto-activating device operation setting of the second passive AC Substation is normal；
The target value of " determining active power " is set for the second converter station；
Make the first passive network system and the second passive network system parallel running；
Second communication channel is switched into stand-by state；
Adjust the target value of " the determining active power " of the second converter station；
First communication channel is switched into inspecting state；
The telegram in reply operates
First communication channel is resumed operation；
Second communication channel is resumed operation；
Put into " trend automatic control " soft pressing plate of the second converter station；
Make the first passive network system and the second passive power grid system separation operation；
Multi-end flexible direct current transmission system is switched into the multiterminal method of operation by the both-end method of operation.
It is preferably, described to make the first passive network system and the second passive network system parallel running, comprising:
The first breaker is closed, the first passive network system and the second passive power grid parallel running are made；
" trend automatic control " soft pressing plate of confirmation second side converter station has dropped out.
It is preferably, described that second communication channel is switched into stand-by state, comprising:
Disconnect third breaker；
Confirm that the second passive AC Substation backup auto-activating device connected as the second spare communication channel charges just
Often.
It is preferably, described that first communication channel is switched into inspecting state, comprising:
Disconnect the second breaker；
Confirm that the second converter station is switched to " pure DC operation " via " AC/DC parallel operation "；
Confirm that the backup auto-activating device operation setting of the second passive AC Substation is normal；
First communication channel is switched into inspecting state.
It is preferably, described that first communication channel resumes operation, comprising:
First communication channel is switched into operating status；
Confirm that the second converter station is switched to " AC/DC parallel operation " by " pure DC operation ".
It is preferably, described to make the first passive network system and the second passive power grid system separation operation, comprising:
Disconnect the first breaker；
Confirm that the backup auto-activating device charging of the second passive AC Substation is normal.
The beneficial effects of the present invention are: a kind of soft straight transmission system of multiterminal and the united power supply system of AC network are provided
And method of supplying power to optimizes the cooperation of flexible HVDC transmission system and AC network, one using AC network backup power automatic switching function
Communication channel outage is still able to maintain a main standby reliable power supply, reduces because a certain element fault causes passive power grid
The risk of power failure improves the reliability of passive power grid power supply.
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 without any creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these 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
To enable the purpose of the present invention, feature, advantage more obvious and understandable, 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, it is clear that reality disclosed below
Applying example is only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field is common
Technical staff's all other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
In the description of the present invention, it is to be understood that, when a component is considered as " connection " another component, it can
To be directly to another component or may be simultaneously present the component being centrally located.When a component is considered as " setting
Set " another component, it, which can be, is set up directly on another component or may be simultaneously present the component being centrally located.
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 the description present invention, rather than the device or original part of indication or suggestion meaning must have this
Specific orientation is operated with specific orientation construction, should not be understood as limitation of the invention with this.
To further illustrate the technical scheme of the present invention 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, by operating dc circuit breaker 11
Disconnect third converter station 6 and 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.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
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).
5. a kind of method of supplying power to, is suitable for the soft straight transmission system of the described in any item multiterminal of Claims 1 to 4 and AC network joins
The power supply system of conjunction, which is characterized in that when first communication channel (8) has a power failure for some reason, the method for supplying power to includes having a power failure
Operation and telegram in reply operation；
The power failure operation includes:
Multi-end flexible direct current transmission system is switched into the both-end method of operation by the multiterminal method of operation；
Confirm that the backup auto-activating device operation setting of the second passive AC Substation (301) is normal；
The target value of " determining active power " is set for the second converter station (5)；
Make the first passive network system (2) and the second passive network system (3) parallel running；
Second communication channel (9) is switched into stand-by state；
Adjust the target value of " the determining active power " of the second converter station (5)；
First communication channel (8) is switched into inspecting state；
The telegram in reply operates
First communication channel (8) is resumed operation；
Second communication channel (9) is resumed operation；
Put into " trend automatic control " soft pressing plate of the second converter station (5)；
Make the first passive network system (2) and the second passive network system (3) fanout operation；
Multi-end flexible direct current transmission system is switched into the multiterminal method of operation by the both-end method of operation.
6. method of supplying power to according to claim 5, which is characterized in that described to make the first passive network system (2) and second
Passive network system (3) parallel running, comprising:
The first breaker (7) are closed, the first passive network system (2) and the second passive power grid parallel running are made；
" trend automatic control " soft pressing plate of confirmation second side converter station has dropped out.
7. method of supplying power to according to claim 6, which is characterized in that described that second communication channel (9) is switched to spare shape
State, comprising:
It disconnects third breaker (901)；
Confirm that the second passive AC Substation (301) backup auto-activating device connected as spare the second communication channel (9) fills
It is electric normal.
8. method of supplying power to according to claim 6, which is characterized in that described to switch to the first communication channel (8) to overhaul shape
State, comprising:
Disconnect the second breaker (801)；
Confirm that the second converter station (5) is switched to " pure DC operation " via " AC/DC parallel operation "；
Confirm that the backup auto-activating device operation setting of the second passive AC Substation (301) is normal；
First communication channel (8) is switched into inspecting state.
9. method of supplying power to according to claim 6, which is characterized in that described that first communication channel (8) resumes operation, packet
It includes:
First communication channel (8) is switched into operating status；
Confirm that the second converter station (5) is switched to " AC/DC parallel operation " by " pure DC operation ".
10. method of supplying power to according to claim 6, which is characterized in that described to make the first passive network system (2) and second
Passive network system (3) fanout operation, comprising:
Disconnect the first breaker (7)；
Confirm that the backup auto-activating device charging of the second passive AC Substation (301) is normal.
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| CN209526520U (en) * | 2019-05-06 | 2019-10-22 | 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 |
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