CN108471132A - A kind of current conversion station carries out the startup method of DC side charging by dc circuit breaker - Google Patents
A kind of current conversion station carries out the startup method of DC side charging by dc circuit breaker Download PDFInfo
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- CN108471132A CN108471132A CN201810272131.3A CN201810272131A CN108471132A CN 108471132 A CN108471132 A CN 108471132A CN 201810272131 A CN201810272131 A CN 201810272131A CN 108471132 A CN108471132 A CN 108471132A
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- Prior art keywords
- circuit breaker
- branch
- full
- conversion station
- current
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
A kind of current conversion station carries out the startup method of DC side charging by dc circuit breaker, includes the following steps：Step 1, it is closed the series connection disconnecting switch of dc circuit breaker, there is the dc circuit breaker transfer branch, transfer branch to route multiple full-bridge sub-module cascade compositions；It is closed polar curve switch, the converter valve of transfer branch and current conversion station is made to form charge circuit；Step 2, DC voltage is provided by full-bridge submodule capacitor so that transfer branch is connected step by step according to full-bridge submodule；Charge circuit generates the full-bridge submodule that electric current is converter valve and dc circuit breaker shifts the full-bridge submodule charging of branch；The each full-bridge submodule for shifting branch with dc circuit breaker is connected step by step, gradually charges for the converter valve of current conversion station；Step 3, after the converter valve charging complete of current conversion station, the closing operation of dc circuit breaker is continued to complete.The present invention is reliable and stable, widely applicable.
Description
Technical field
The present invention relates to current conversion station charging techniques, and in particular to a kind of current conversion station carries out DC side by dc circuit breaker and fills
It is each to be suitable for flexible DC power transmission, DC grid or Hybrid HVDC configured with dc circuit breaker etc. for the startup method of electricity
Class system, dc circuit breaker can be comprising the mixed DC breaker of sub-module cascade, solid-state direct-current breaker and mechanical
Dc circuit breaker.
Background technology
Flexible direct current power transmission system, can be in the case where not changing polarity of voltage relative to conventional DC transmission system
Trend reversion is realized by reverse current direction.Flexible DC power transmission with higher reliability and flexible direct current network system,
Most significant feature is to realize that multiple feed and more drop points by electricity, provide a kind of more flexible, quick for electric system
Power transmission mode.
As various extensive regenerative resources access power grid, traditional electrical circuitry equipment, electric network composition and running technology etc.
It is more and more unable to do what one wishes when receiving, thus need to employ new technology, new equipment and new electric network composition meet future source of energy pattern
Variation.And the multi-terminal direct current transmission system and DC grid technology based on customary DC and flexible direct current are to solve the problems, such as this
One of effective technology means.In specific engineer application, if the isolated island in multi-terminal direct current transmission system or DC grid changes
After stream station failure exits, it may be difficult to access straight-flow system again.It is opened according to direct closure dc circuit breaker or DC bus
It closes, charges for isolated island transverter, electric current when charging is larger, it would be possible to be caused to device in converter valve and direct current side apparatus
Damage.And DC side configuration it is soft open resistance carry out DC side charging needed although dash current can be inhibited to a certain degree
Newly added equipment cost.
Invention content
It is an object of the invention to the problems in for the above-mentioned prior art, provide a kind of current conversion station to pass through dc circuit breaker
Carry out DC side charging startup method, whole process system is reliable and stable, disclosure satisfy that Multi-end flexible direct current transmission system with
And isolated island current conversion station list station puts into the charging needs of process again in flexible direct current network system after exiting.
To achieve the goals above, the technical solution adopted by the present invention includes the following steps：
Step 1, it is closed the series connection disconnecting switch of dc circuit breaker, the dc circuit breaker has transfer branch, transfer
Branch route multiple full-bridge sub-module cascade compositions；It is closed polar curve switch, the converter valve of transfer branch and current conversion station is made to form charging
Circuit；
Step 2, conducting direct current breaker shifts the full-bridge submodule valve group in branch step by step；
Charge circuit generates the full-bridge submodule that electric current is converter valve and dc circuit breaker shifts the full-bridge submodule of branch
Block charges；
With dc circuit breaker shift branch each full-bridge submodule be connected step by step, gradually for the converter valve of current conversion station into
Row charging；
Step 3, after the converter valve charging complete of current conversion station, the closing operation of dc circuit breaker is continued to complete.
The polar curve switch selects direct-current polar switch or polar curve AC circuit breaker.
The dc circuit breaker selects mixed DC breaker, solid-state direct-current breaker or mechanical direct current interruption
Device.
When step 3 continues to complete closing operation to mixed DC breaker, it is closed the mechanical switch of on-state branch first, leads
Logical primary path full-bridge submodule, then turns off all full-bridge submodules of transfer branch, electric current is transferred to logical by transfer branch again
State branch.
Mixed DC breaker includes on-state branch, transfer branch and energy consumption branch；The on-state branch is for being connected
Straight-flow system load current is made of mechanical switch and primary path full-bridge submodule；The energy consumption branch is for absorbing direct current
System overcurrent is made of arrester group, is shifted the one group of arrester in parallel of each full-bridge submodule in branch and is carried out energy suction
It receives.
When overvoltage occurs in the full-bridge submodule of transfer branch, when the voltage corresponds to lightning arrester connected in parallel beyond full-bridge submodule
Reference voltage, flow through electric current in arrester and risen with the voltage for alleviating full-bridge submodule, but the electric current be continuously converter valve into
Row charging.
When the converter valve of current conversion station is charged, the full-bridge submodule of converter valve presses shape automatically into soft open after the power is turned on
State.
Compared with prior art, the present invention is closed direct-current polar and is opened by the series connection disconnecting switch of closure dc circuit breaker
It closes, the transfer branch of dc circuit breaker and the converter valve of current conversion station form charge circuit, step by step the full-bridge in conducting transfer branch
Submodule gradually charges for the converter valve of current conversion station as the full-bridge submodule of transfer branch is connected step by step, works as current conversion station
Converter valve charging complete after, continue to complete the closing operation of dc circuit breaker.Reduce the steady-state loss of dc circuit breaker.This hair
It is bright exited for isolated island current conversion station list station failure after gradually open and network after the change of current station failure input again propose it is feasible
Solution, while the startup method of the present invention can also apply to the current conversion station normally operating modes such as startup.It is tested in implementation process
The startup method of card, DC side charging of the present invention is reliable and stable, is not in the failures such as system overvoltage, overcurrent, has suitable extensively
The property used.
Description of the drawings
Fig. 1 full-bridge cascade connection type mixed DC breaker topology diagrams；
The circuit diagram that Fig. 2 charges to converter valve by dc circuit breaker；
Charge circuit schematic diagram after the full-bridge submodule of Fig. 3 dc circuit breakers turning part；
Fig. 4 full-bridge cascade connection type solid-state direct-current breaker topology diagrams.
Specific implementation mode
Present invention will be described in further detail below with reference to the accompanying drawings.
Current conversion station of the present invention has wide applicability by the startup method that dc circuit breaker carries out DC side charging, fits
For sorts of systems such as flexible DC power transmission, DC grid or Hybrid HVDCs configured with dc circuit breaker.Direct current interruption
Device can be mixed DC breaker, solid-state direct-current breaker and the mechanical dc circuit breaker for including sub-module cascade.
, can be gradually open-minded by controlling dc circuit breaker after isolated island current conversion station list station failure exits, to flexible direct current
Transverter carries out DC side charging, and whole process system is reliable and stable, is not in system overcurrent, over-pressed phenomenon.The networking change of current
The method that the operating modes such as normal startup of input and current conversion station can be through the invention again after station failure is started.
Embodiment 1
Referring to Fig. 1, by taking the hybrid dc circuit breaker of full-bridge cascade connection type as an example, invention is not limitedly applied to such breakers
On.
The hybrid dc circuit breaker of full-bridge cascade connection type is made of three branches, respectively main branch (on-state branch), transfer
Branch and energy consumption branch composition.According to breaker configure principle, bridge-type dc circuit breaker both ends there is still a need for configuration every
Leave pass.
Main branch (on-state branch) is by ultrahigh speed mechanical isolation switch (mechanical switch) and a small amount of cascade full-bridge submodule
It constitutes, is used for conducting direct current system loading electric current；It shifts branch and route a large amount of full-bridge sub-module cascade composition, for turning off direct current
System short-circuit fault electric current；The branch that consumes energy routing arrester group connection in series-parallel is constituted, for absorbing straight-flow system overcurrent.Shift branch
In full-bridge submodule be generally divided into several groups cascade pattern, every group of submodule one group of arrester in parallel carries out energy absorption.
Present invention application full-bridge cascade connection type mixed DC breaker carries out the startup method of DC side charging, including following step
Suddenly：
1, circuit making process；
It is closed the series connection disconnecting switch of dc circuit breaker, is closed direct-current polar switch (or polar curve AC circuit breaker), to
Straight-flow system shifts branch by dc circuit breaker and forms charge circuit with flexible direct current converter valve, as shown in Figure 2.
The process charges to the transfer branch submodule of converter valve submodule and dc circuit breaker, general direct current interruption
Submodule capacitance in device is much smaller than the submodule capacitance in converter valve, therefore dc circuit breaker Neutron module capacitance voltage is opposite
It is higher, support the DC voltage of straight-flow system.Converter valve submodule capacitor voltage is relatively low during being somebody's turn to do, and charging process can be ignored
Disregard.
2, dc circuit breaker transfer branch is connected step by step；
After disconnecting switch and the direct-current polar switch of dc circuit breaker, dc circuit breaker shifts the submodule capacitance in branch
For voltage close to rated voltage, the capacitance voltage of converter valve submodule is approximately zero.After system is stablized, dc circuit breaker is still located
In off state, the DC voltage of straight-flow system is supported by the cascade submodule of transfer branch capacitor in the block.Dc circuit breaker
Branch is shifted according to submodule group molar behavior, is connected step by step.After the full-bridge submodule triggering and conducting of level-one valve group, phase
When in by this group of submodule capacitive bypass, the direct short-circuit of submodule both ends.At this point, other locking submodules will be not enough to support directly
Galvanic electricity pressure, it is that converter valve submodule and dc circuit breaker shift the charging of branch submodule that electric current is generated in charge circuit.Work as open circuit
There is overvoltage in device transfer branch submodule, when beyond corresponding lightning arrester connected in parallel group reference voltage, flows through electric current in arrester, delays
The voltage for solving dc circuit breaker submodule rises, but the electric current will continue as converter valve and charge.Dc circuit breaker transfer branch
In road after the submodule triggering and conducting of every one-step valve group, the above process is completed, a new steady s tate is reached.With direct current
The process that breaker is connected step by step will be gradually that converter valve charges, and converter valve submodule voltage steps up, such as Fig. 3 institutes
Show.
After dc circuit breaker shifts the submodule triggering and conducting of afterbody valve group in branch, dc circuit breaker is led completely
It is logical, will be that converter valve carries out final step charging process, the submodule voltage of converter valve will be enough to support straight-flow system after stablizing
Voltage.
In the charging process, converter valve Neutron module should open equal pressure condition, cut-out submodule automatically into soft after the power is turned on
Block, with ensure DC side charging after submodule voltage reach rated voltage.The process and conventional DC side charging strategy
Unanimously.
3, dc circuit breaker completes closing operation；
After flexible direct current converter valve charging complete, the closing operation for continuing to complete dc circuit breaker is needed, direct current will be flowed through
The electric current of breaker is transferred to main branch by transfer branch, reduces breaker steady-state loss.It is as follows：
It is closed the mechanical switch of on-state branch, after the completion of mechanical switch closes a floodgate, full-bridge submodule in on-state branch is connected
The IGBT of all full-bridge modules in branch is shifted in IGBT, finally shutdown, and full-bridge cascade connection type dc circuit breaker, which closes a floodgate, to be completed.
Embodiment 2
Referring to Fig. 4, by taking full-bridge cascade connection type solid-state direct-current breaker as an example, invention is not limitedly applied to such breakers
On.
Full-bridge cascade connection type solid-state direct-current breaker is made of two branches, respectively main branch (on-state branch) and energy consumption branch
Road, according to the principle that breaker configures, at breaker both ends, there is still a need for configuration ultrahigh speed mechanical isolation switches.
Main branch (on-state branch) is made of a large amount of full-bridge sub-module cascade, for turning off straight-flow system short trouble electricity
Stream；The branch that consumes energy routing arrester group connection in series-parallel is constituted, for absorbing straight-flow system overcurrent.It is complete in main branch (on-state branch)
Bridge submodule is generally divided into several groups cascade pattern, and every group of submodule one group of arrester in parallel carries out energy absorption.
Present invention application full-bridge cascade connection type solid-state direct-current breaker carries out the startup method of DC side charging, including following step
Suddenly：
1, the series connection disconnecting switch of close circuit breaker is closed direct-current polar switch (or polar curve AC circuit breaker), to straight
Streaming system forms charge circuit by dc circuit breaker main branch and flexible direct current converter valve, as shown in Figure 4.
The process charges to converter valve submodule and dc circuit breaker main branch submodule, in general dc circuit breaker
Submodule capacitance much smaller than the submodule capacitance in converter valve, therefore dc circuit breaker Neutron module capacitance voltage is relatively
Height supports the DC voltage of straight-flow system.Capacitance voltage of converter valve submodule is relatively low during this, and charging process can be ignored
Disregard.
2, dc circuit breaker main branch is connected step by step；
After disconnecting switch and the direct-current polar switch of dc circuit breaker, the submodule capacitance electricity in dc circuit breaker main branch
Crimping is bordering on rated voltage, and the capacitance voltage of converter valve submodule is approximately zero.After system is stablized, dc circuit breaker is still in
Off state is supported the DC voltage of straight-flow system by the cascade submodule of main branch capacitor in the block.
Dc circuit breaker main branch is connected step by step according to submodule group molar behavior.When full-bridge of level-one valve group
After module triggering and conducting, it is equivalent to this group of submodule capacitive bypass, the direct short-circuit of submodule both ends.At this point, other locking
Module will be not enough to support DC voltage, and it is converter valve submodule and dc circuit breaker main branch that electric current is generated in charge circuit
Module charges.When there is overvoltage in breaker main branch submodule, exceeds corresponding lightning arrester connected in parallel group reference voltage, arrester
In flow through electric current, the voltage for alleviating dc circuit breaker submodule rises, but the electric current will continue as converter valve and charge.
In dc circuit breaker main branch after the submodule triggering and conducting of every one-step valve group, the above process is completed, reaches one
A new steady s tate.The process be connected step by step with dc circuit breaker will be gradually that converter valve charges, converter valve submodule
Block voltage steps up.After the submodule triggering and conducting of afterbody valve group in dc circuit breaker main branch, dc circuit breaker
It is fully on, will be that converter valve carries out final step charging process, the submodule voltage of converter valve will be enough to support straight after stablizing
Streaming system voltage.
In the charging process, converter valve Neutron module should open equal pressure condition, cut-out submodule automatically into soft after the power is turned on
Block, with ensure DC side charging after submodule voltage reach rated voltage.The process and conventional DC side charging strategy
Unanimously.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, and those skilled in the art reads
After reading description, with reference to above-described embodiment to the various modifications of the invention carried out or change, the model of claim is each fallen within
Within enclosing.
Claims (7)
1. a kind of current conversion station carries out the startup method of DC side charging by dc circuit breaker, which is characterized in that including following step
Suddenly：
Step 1, it is closed the series connection disconnecting switch of dc circuit breaker, the dc circuit breaker has transfer branch, shifts branch
It is made of multiple full-bridge sub-module cascades；It is closed polar curve switch, the converter valve of transfer branch and current conversion station is made to form charge circuit；
Step 2, conducting direct current breaker shifts the full-bridge submodule valve group in branch step by step；
Charge circuit generates the full-bridge submodule that electric current is converter valve and the full-bridge submodule of dc circuit breaker transfer branch fills
Electricity；
The each full-bridge submodule for shifting branch with dc circuit breaker is connected step by step, is gradually filled for the converter valve of current conversion station
Electricity；
Step 3, after the converter valve charging complete of current conversion station, the closing operation of dc circuit breaker is continued to complete.
2. current conversion station carries out the startup method of DC side charging by dc circuit breaker according to claim 1, feature exists
In：The polar curve switch selects direct-current polar switch or polar curve AC circuit breaker.
3. current conversion station carries out the startup method of DC side charging by dc circuit breaker according to claim 1, feature exists
In：The dc circuit breaker selects mixed DC breaker, solid-state direct-current breaker or mechanical dc circuit breaker.
4. current conversion station carries out the startup method of DC side charging by dc circuit breaker according to claim 3, feature exists
In：When step 3 continues to complete closing operation to mixed DC breaker, it is closed the mechanical switch of on-state branch, conducting master first
Access full-bridge submodule, then turns off all full-bridge submodules of transfer branch again, and electric current is transferred to on-state branch by transfer branch
Road.
5. current conversion station carries out the startup method of DC side charging by dc circuit breaker according to claim 3, feature exists
In：Mixed DC breaker includes on-state branch, transfer branch and energy consumption branch；The on-state branch is used for conducting direct current system
System load current, is made of mechanical switch and primary path full-bridge submodule；The energy consumption branch is for absorbing straight-flow system mistake
Electric current is made of arrester group, is shifted the one group of arrester in parallel of each full-bridge submodule in branch and is carried out energy absorption.
6. current conversion station carries out the startup method of DC side charging by dc circuit breaker according to claim 5, feature exists
In：When overvoltage occurs in the full-bridge submodule of transfer branch, when the voltage exceeds the ginseng that full-bridge submodule corresponds to lightning arrester connected in parallel
Voltage is examined, electric current is flowed through in arrester and is risen with the voltage for alleviating full-bridge submodule, but the electric current is continuously converter valve and is filled
Electricity.
7. current conversion station carries out the startup method of DC side charging by dc circuit breaker according to claim 1, feature exists
In：When the converter valve of current conversion station is charged, the full-bridge submodule of converter valve opens equal pressure condition automatically into soft after the power is turned on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810272131.3A CN108471132A (en) | 2018-03-29 | 2018-03-29 | A kind of current conversion station carries out the startup method of DC side charging by dc circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810272131.3A CN108471132A (en) | 2018-03-29 | 2018-03-29 | A kind of current conversion station carries out the startup method of DC side charging by dc circuit breaker |
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Family
ID=63262339
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109873441A (en) * | 2019-03-29 | 2019-06-11 | 西安许继电力电子技术有限公司 | A kind of wind-powered electricity generation flexible direct current transmitting system with distributed DC energy-consuming device |
| CN110768519A (en) * | 2019-11-27 | 2020-02-07 | 南方电网科学研究院有限责任公司 | Overvoltage protection method and device for flexible direct current converter valve and storage medium thereof |
| CN111551844A (en) * | 2020-05-06 | 2020-08-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Flexible direct current converter valve type test device and method |
| CN112003357A (en) * | 2020-08-25 | 2020-11-27 | 中车株洲电力机车研究所有限公司 | Circuit control method based on solid-state switch and solid-state switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109873441A (en) * | 2019-03-29 | 2019-06-11 | 西安许继电力电子技术有限公司 | A kind of wind-powered electricity generation flexible direct current transmitting system with distributed DC energy-consuming device |
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| CN111551844A (en) * | 2020-05-06 | 2020-08-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Flexible direct current converter valve type test device and method |
| CN112003357A (en) * | 2020-08-25 | 2020-11-27 | 中车株洲电力机车研究所有限公司 | Circuit control method based on solid-state switch and solid-state switch |
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Application publication date: 20180831 |