CN208754000U - Direct current is let out can branch and HVDC transmission system - Google Patents
Direct current is let out can branch and HVDC transmission system Download PDFInfo
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- CN208754000U CN208754000U CN201821409554.7U CN201821409554U CN208754000U CN 208754000 U CN208754000 U CN 208754000U CN 201821409554 U CN201821409554 U CN 201821409554U CN 208754000 U CN208754000 U CN 208754000U
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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 direct current transmission and distribution technical field, disclosing that a kind of direct current lets out can branch, comprising: the first dynamic let out can branch and the second dynamic let out can branch；First dynamic is let out the input terminal of energy branch and is electrically connected with the anode of the HVDC transmission system DC power transmission line, the output end that first dynamic lets out energy branch is electrically connected and is grounded with the input terminal that second dynamic lets out energy branch, and the output end that second dynamic lets out energy branch is electrically connected with the cathode of the HVDC transmission system transmission line of electricity；It includes that the first thyristor groups circuit and first let out energy resistance and the first arrester group that first dynamic, which lets out energy branch,；It includes that the second thyristor groups circuit and second let out energy resistance and the second arrester group that second dynamic, which lets out energy branch,.The utility model can be effectively reduced the voltage at component both ends, guarantee the normal operation of component.
Description
Technical field
The utility model relates to direct current transmission and distribution technical fields, and letting out more particularly to a kind of direct current can branch and high voltage direct current
Transmission system.
Background technique
The fast development of electronic power switch device in recent years, flexible DC transmission is in voltage class, transmission distance and biography
On defeated capacity, transmit electricity to Traditional DC gradually close.The control and protection system of flexible HVDC transmission system can pass through
Reasonable configuration is to improve the uninterrupted operation ability of system in case of a fault, to realize the defencive function of system.However,
When receiving end converter station ac bus failure or when disturbing, busbar voltage will be fallen, so that system can be caused to transmit function
The decline of rate, if in the case that sending end converter station keeps nominal transmission power constant during failure at this time, it will lead to the change of current
Submodule capacitor voltage of standing and AC line voltage increase, and so as to cause the damage of power device and capacitor, problems are new
The energy is grid-connected send outside in the case where more protrude.Therefore, it is necessary to during receiving end exchanges side failure (200ms-300ms), needle
The power that can not be fully absorbed to receiving end AC system is released, and system reboot is completed after failure removal and restores to operate normally
State, to guarantee the safe operation of power device in the converter station of both ends.
When DC transmission system breaks down, although existing direct current is let out energy branch and can also be let out to superfluous power
It puts, still, since component is directly connect with DC line, the dielectric level requirement that will lead to component increases, to increase
Equipment cost.
Utility model content
The purpose of the utility model is to provide a kind of direct currents to let out energy branch, can be effectively reduced the electricity at component both ends
Pressure, guarantees the normal operation of component.
In order to solve the above-mentioned technical problem, the utility model provide a kind of direct current let out can branch, be configured at high-voltage dc transmission
Electric system, comprising: the first dynamic lets out energy branch and the second dynamic lets out energy branch；
First dynamic is let out can the input terminal of branch and the anode of the HVDC transmission system DC power transmission line
Electrical connection, the output end that first dynamic lets out energy branch are electrically connected and connect with the input terminal that second dynamic lets out energy branch
Ground, the output end that second dynamic lets out energy branch are electrically connected with the cathode of the HVDC transmission system transmission line of electricity；
First dynamic lets out energy branch and lets out energy resistance and the first arrester group including the first thyristor groups circuit, first,
The first end of the first thyristor groups circuit is electrically connected with the anode of the HVDC transmission system DC power transmission line, institute
The first end that the second end for stating the first thyristor groups circuit lets out energy resistance with described first is electrically connected, and described first lets out energy resistance
Second end is electrically connected with the first end of the first arrester group, the second end of the first arrester group and second dynamic
The input terminal for letting out energy branch is electrically connected and is grounded；
It includes that the second thyristor groups circuit and second let out energy resistance and the second arrester group that second dynamic, which lets out energy branch,
The first end of the second thyristor groups circuit and first dynamic let out can the output end of branch be electrically connected and be grounded, described the
The first end that the second end of two thyristor groups circuits lets out energy resistance with described second is electrically connected, and described second lets out the second of energy resistance
End is electrically connected with the first end of the second arrester group, the second end of the second arrester group and the D.C. high voltage transmission
The cathode of system dc transmission line of electricity is electrically connected.
As prioritization scheme, the first thyristor groups circuit includes the first thyristor groups that several are connected in series,
In, first thyristor groups include M thyristor, M >=1.
As prioritization scheme, the second thyristor groups circuit includes the second thyristor groups that several are connected in series,
In, second thyristor groups include N number of thyristor, N >=1.
As prioritization scheme, described first let out can resistance and described second let out can the resistance value of resistance pass through following calculation formula
It is calculated:
Wherein, UdFor DC voltage actual value at this time, UdrateFor DC voltage rated value, m is that investment lets out energy resistance
When threshold value, P1For the sending end station transmission power of the HVDC transmission system, P2For the HVDC transmission system by
It is P that end station, which receives power,3To flow into the power that the lightning arrest direct current lets out energy branch, meet P under normal operation1=P2,
P3=0.
As prioritization scheme, arrester quantity in the first arrester group is m, and between m arrester it is in the same direction simultaneously
Connection, and be connected in parallel between the positive and negative anodes of the HVDC transmission system DC power transmission line jointly, wherein m >=1；
As prioritization scheme, arrester quantity in the second arrester group is n, and between n arrester it is in the same direction simultaneously
Connection, and be connected in parallel between the positive and negative anodes of the HVDC transmission system DC power transmission line jointly, wherein n >=1.
In order to solve identical technical problem, the utility model also provides a kind of HVDC transmission system, including rectification
It stands, Inverter Station, DC line and dynamically let out as described above can branch；Wherein, the converting plant and the Inverter Station include
Modularization multi-level converter；The modularization of positive, the described Inverter Station of the modularization multi-level converter of the converting plant is more
The anode of level converter is connected with the DC line；The cathode of the modularization multi-level converter of the converting plant, institute
The cathode for stating the modularization multi-level converter of Inverter Station is connected with the DC line.
Direct current in the utility model embodiment lets out energy branch, including the first dynamic lets out energy branch and the second dynamic is let out and can be propped up
Road；The anode that first dynamic lets out the input terminal and the HVDC transmission system DC power transmission line of energy branch is electrically connected
It connects, the output end that first dynamic lets out energy branch is electrically connected and is grounded, institute with the input terminal that second dynamic lets out energy branch
State the second dynamic let out can the output end of branch be electrically connected with the cathode of the HVDC transmission system transmission line of electricity；Described first
Dynamic lets out energy branch and lets out energy resistance and the first arrester group, first thyristor groups including the first thyristor groups circuit, first
The first end of circuit is electrically connected with the anode of the HVDC transmission system DC power transmission line, the first thyristor groups electricity
The first end that the second end on road lets out energy resistance with described first is electrically connected, and described first lets out the second end and described first of energy resistance
The first end of arrester group is electrically connected, and the second end of the first arrester group lets out the input terminal of energy branch with second dynamic
It is electrically connected and is grounded；Second dynamic let out can branch include the second thyristor groups circuit with second let out can resistance and second take shelter from the thunder
Device group, the first end of the second thyristor groups circuit are electrically connected and are grounded with the output end that first dynamic lets out energy branch,
The first end that the second end of the second thyristor groups circuit lets out energy resistance with described second is electrically connected, and described second lets out energy resistance
Second end be electrically connected with the first end of the second arrester group, the second end of the second arrester group and the high straightening
Flow the cathode electrical connection of transmission system DC power transmission line.Several series thyristor groups are accessed by the anode in DC line
And energy resistance is let out, while letting out energy branch for dynamic and constructing a grounding point, it can be effectively reduced the voltage at component both ends,
Guarantee the normal operation of component.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of HVDC transmission system in the utility model embodiment；
Fig. 2 be in the utility model embodiment a kind of direct current let out can branch structural schematic diagram.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is not intended to limit the scope of the present invention for illustrating the utility model.
As shown in Figure 1, being a kind of structural schematic diagram of HVDC transmission system provided by the embodiment of the utility model, institute
Stating modularization multi-level converter HVDC transmission system includes that converting plant, Inverter Station, DC line and dynamic are let out and can be propped up
Road；Wherein, the converting plant and the Inverter Station include modularization multi-level converter；The modular multilevel of the converting plant
The anode of the modularization multi-level converter of positive, the described Inverter Station of inverter is connected with the DC line；It is described whole
Flow the cathode and the direct current of the cathode of the modularization multi-level converter at station, the modularization multi-level converter of the Inverter Station
Route is connected.
In the utility model embodiment, it should be noted that the modularization multi-level converter of the converting plant and institute
The modularization multi-level converter for stating Inverter Station has 6 bridge arms, each bridge arm submodule SM (Sub- the same by N number of specification
Module it) is composed in series with a reactor L.The module of the modularization multi-level converter of the converting plant and the Inverter Station
Change multilevel converter passes through three-phase transformer and connect with AC system, AC system power supply UsaBy indicating, transformer is used
Equivalent inductance LsaIt indicates, r is used in converter station losseqIt indicates, transformer reactance XTIt indicates, AC line voltage UdIt indicates.Its
In, the submodule SM is half-bridge submodule.
In the present embodiment, in the modularization multi-level converter HVDC transmission system, converting plant is set
Transmission power is P1, the reception power of Inverter Station is P2, flowing into the dynamic and letting out the power of energy branch is P3, work as DC power transmission system
P when system operates normally1=P2, P3=0；When singlephase earth fault occurs for the exchange side bus of Inverter Station, the exchange side bus
Voltage can decline, and the reception power of Inverter Station reduces, and the transmission power of converting plant remains unchanged at this time, it is therefore desirable to which starting is dynamic
State lets out energy branch to consume extra power.
Referring to figs. 1 and 2, in the preferred embodiment in the utility model in order to solve the above-mentioned technical problem, this is practical
It is novel provide a kind of direct current let out can branch, be configured at HVDC transmission system, comprising: the first dynamic is let out can branch and second dynamic
State is let out can branch；
First dynamic is let out can the input terminal of branch and the anode of the HVDC transmission system DC power transmission line
Electrical connection, the output end that first dynamic lets out energy branch are electrically connected and connect with the input terminal that second dynamic lets out energy branch
Ground, the output end that second dynamic lets out energy branch are electrically connected with the cathode of the HVDC transmission system transmission line of electricity；
First dynamic lets out energy branch and lets out energy resistance and the first arrester group including the first thyristor groups circuit, first,
The first end of the first thyristor groups circuit is electrically connected with the anode of the HVDC transmission system DC power transmission line, institute
The first end that the second end for stating the first thyristor groups circuit lets out energy resistance with described first is electrically connected, and described first lets out energy resistance
Second end is electrically connected with the first end of the first arrester group, the second end of the first arrester group and second dynamic
The input terminal for letting out energy branch is electrically connected and is grounded；
It includes that the second thyristor groups circuit and second let out energy resistance and the second arrester group that second dynamic, which lets out energy branch,
The first end of the second thyristor groups circuit and first dynamic let out can the output end of branch be electrically connected and be grounded, described the
The first end that the second end of two thyristor groups circuits lets out energy resistance with described second is electrically connected, and described second lets out the second of energy resistance
End is electrically connected with the first end of the second arrester group, the second end of the second arrester group and the D.C. high voltage transmission
The cathode of system dc transmission line of electricity is electrically connected.
In the utility model embodiment, first dynamic lets out energy branch and lets out energy branch with phase with second dynamic
Same structure, is intended merely to make it differentiation using the describing mode of " first ", " second ", without restriction effect.
The utility model accesses several series thyristor groups by the anode in DC line and lets out energy resistance and keep away
Thunder device group, while letting out energy branch for dynamic and constructing a grounding point, it can be effectively reduced the voltage at component both ends, guarantee member
The normal operation of device, and reduce equipment cost.
In the utility model embodiment, the first thyristor groups circuit includes the first brilliant lock that several are connected in series
Pipe group, wherein first thyristor groups include M thyristor, M >=1.
In the utility model embodiment, the second thyristor groups circuit includes the second brilliant lock that several are connected in series
Pipe group, wherein second thyristor groups include N number of thyristor, N >=1.
In the utility model embodiment, described first let out can resistance and described second let out can resistance resistance value by following
Calculation formula is calculated:
Wherein, UdFor DC voltage actual value at this time, UdrateFor DC voltage rated value, m is that investment lets out energy resistance
When threshold value, P1For the sending end station transmission power of the HVDC transmission system, P2For the HVDC transmission system by
It is P that end station, which receives power,3To flow into the power that the lightning arrest direct current lets out energy branch, meet P under normal operation1=P2,
P3=0.
In addition, above-mentioned first, which lets out energy resistance and second, lets out the calculating public affairs of energy resistance in the utility model embodiment
What formula obtained let out can resistance value be the direct current let out can in branch it is maximum let out can resistance resistance value requirement, and since arrester can also
Can suitably reduce the requirement for letting out energy resistance, tool according to the impedance operator of arrester as a part for letting out energy resistance
Body adjusts according to the actual situation, without limitation.
In the utility model embodiment, the arrester quantity in the first arrester group is m, and m arrester
Between it is in parallel in the same direction, and be connected in parallel between the positive and negative anodes of the HVDC transmission system DC power transmission line jointly, wherein m >=
1；
In the utility model embodiment, the arrester quantity in the second arrester group is n, and n arrester
Between it is in parallel in the same direction, and be connected in parallel between the positive and negative anodes of the HVDC transmission system DC power transmission line jointly, wherein n >=
1。
In the utility model embodiment, because of the special impedance operator of arrester, it both can be used as and let out energy resistance, it can also
To carry out clamper to the voltage after failure, to reduce the investment for letting out energy resistance, voltage between the end for letting out each equipment in energy circuit is reduced,
Save the cost.
To sum up, including the first dynamic lets out energy branch and the second dynamic lets out energy branch；First dynamic lets out the defeated of energy branch
Enter end to be electrically connected with the anode of the HVDC transmission system DC power transmission line, first dynamic lets out the output of energy branch
It holds the input terminal for letting out energy branch with second dynamic to be electrically connected and is grounded, second dynamic lets out output end and the institute of energy branch
State the cathode electrical connection of HVDC transmission system transmission line of electricity；It includes the first thyristor groups electricity that first dynamic, which lets out energy branch,
Road, first let out energy resistance and the first arrester group, the first end of the first thyristor groups circuit and the D.C. high voltage transmission
The anode electrical connection of system dc transmission line of electricity, the second end of the first thyristor groups circuit let out energy resistance with described first
First end electrical connection, described first let out can the second end of resistance be electrically connected with the first end of the first arrester group, described the
The second end of one arrester group is electrically connected and is grounded with the input terminal that second dynamic lets out energy branch；Second dynamic lets out energy
Branch, which includes the second thyristor groups circuit, lets out energy resistance and the second arrester group with second, and the of the second thyristor groups circuit
One end and first dynamic let out can the output end of branch be electrically connected and is grounded, the second end of the second thyristor groups circuit and
Described second let out can resistance first end electrical connection, described second let out can resistance second end and the second arrester group the
One end electrical connection, the negative electricity of the second end of the second arrester group and the HVDC transmission system DC power transmission line
Connection.Several series thyristor groups are accessed by the anode in DC line and let out energy resistance, while being let out and can be propped up for dynamic
Road constructs a grounding point, can be effectively reduced the voltage at component both ends, guarantee the normal operation of component.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without deviating from the technical principle of the utility model, several improvement and replacement can also be made, these change
It also should be regarded as the protection scope of the utility model into replacement.
Claims (7)
1. a kind of direct current lets out energy branch, it is configured at HVDC transmission system characterized by comprising the first dynamic, which is let out, to prop up
Road and the second dynamic are let out can branch；
The anode that first dynamic lets out the input terminal and the HVDC transmission system DC power transmission line of energy branch is electrically connected
It connects, the output end that first dynamic lets out energy branch is electrically connected and is grounded, institute with the input terminal that second dynamic lets out energy branch
State the second dynamic let out can the output end of branch be electrically connected with the cathode of the HVDC transmission system transmission line of electricity；
First dynamic lets out energy branch and lets out energy resistance and the first arrester group including the first thyristor groups circuit, first, described
The anode of the first end of first thyristor groups circuit and the HVDC transmission system DC power transmission line is electrically connected, and described the
The first end that the second end of one thyristor groups circuit lets out energy resistance with described first is electrically connected, and described first lets out the second of energy resistance
End is electrically connected with the first end of the first arrester group, and the second end of the first arrester group and second dynamic let out energy
The input terminal of branch is electrically connected and is grounded；
It includes that the second thyristor groups circuit and second let out energy resistance and the second arrester group that second dynamic, which lets out energy branch, described
The first end of second thyristor groups circuit is electrically connected and is grounded with the output end that first dynamic lets out energy branch, and described second is brilliant
The second end of brake tube group circuit with described second let out can the first end of resistance be electrically connected, described second let out can resistance second end and
The first end of the second arrester group is electrically connected, the second end of the second arrester group and the HVDC transmission system
The cathode of DC power transmission line is electrically connected.
2. direct current as described in claim 1 lets out energy branch, which is characterized in that the first thyristor groups circuit includes several
The first thyristor groups being connected in series, wherein first thyristor groups include M thyristor, M >=1.
3. direct current as described in claim 1 lets out energy branch, which is characterized in that the second thyristor groups circuit includes several
The second thyristor groups being connected in series, wherein second thyristor groups include N number of thyristor, N >=1.
4. direct current as described in claim 1 lets out energy branch, which is characterized in that described first, which lets out energy resistance and described second, lets out energy
The resistance value of resistance is calculated by following calculation formula:
Wherein, UdFor DC voltage actual value at this time, UdrateFor DC voltage rated value, m is to put into when letting out energy resistance
Threshold value, P1For the sending end station transmission power of the HVDC transmission system, P2It is the HVDC transmission system by end station
Receiving power is P3To flow into the power that the direct current lets out energy branch, meet P under normal operation1=P2, P3=0.
5. direct current as described in claim 1 lets out energy branch, which is characterized in that the arrester quantity in the first arrester group
It is m, and in parallel in the same direction between m arrester, and is connected in parallel on the HVDC transmission system DC power transmission line jointly just
Between cathode, wherein m >=1.
6. direct current as described in claim 1 lets out energy branch, which is characterized in that the arrester quantity in the second arrester group
It is n, and in parallel in the same direction between n arrester, and is connected in parallel on the HVDC transmission system DC power transmission line jointly just
Between cathode, wherein n >=1.
7. a kind of HVDC transmission system, which is characterized in that including converting plant, Inverter Station, DC line and as right is wanted
Asking 1 to 6 described in any item direct currents to let out can branch；Wherein, the converting plant and the Inverter Station include that modular multilevel changes
Flow device；The modularization multi-level converter of positive, the described Inverter Station of the modularization multi-level converter of the converting plant is just
Pole is connected with the DC line；The module of the cathode of the modularization multi-level converter of the converting plant, the Inverter Station
The cathode for changing multilevel converter is connected with the DC line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821409554.7U CN208754000U (en) | 2018-08-29 | 2018-08-29 | Direct current is let out can branch and HVDC transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821409554.7U CN208754000U (en) | 2018-08-29 | 2018-08-29 | Direct current is let out can branch and HVDC transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208754000U true CN208754000U (en) | 2019-04-16 |
Family
ID=66082381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821409554.7U Active CN208754000U (en) | 2018-08-29 | 2018-08-29 | Direct current is let out can branch and HVDC transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208754000U (en) |
-
2018
- 2018-08-29 CN CN201821409554.7U patent/CN208754000U/en active Active
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