CN108322036A - A kind of novel flexible DC converter station - Google Patents
A kind of novel flexible DC converter station Download PDFInfo
- Publication number
- CN108322036A CN108322036A CN201810370231.XA CN201810370231A CN108322036A CN 108322036 A CN108322036 A CN 108322036A CN 201810370231 A CN201810370231 A CN 201810370231A CN 108322036 A CN108322036 A CN 108322036A
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- Prior art keywords
- resistor
- current
- voltage
- resistive segments
- breaker
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Classifications
-
- 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
- H02M1/36—Means for starting or stopping converters
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The present invention provides a kind of novel flexible DC converter station, the current conversion station includes start-up resistor, transformer and transverter, and the alternating current of input handles through the transverter after the start-up resistor and the transformer and is converted to direct current electricity output；The start-up resistor is composed in series by multiple resistive segments, and each resistive segments are made of a breaker at least one resistor coupled in parallel.The novel flexible current conversion station of the present invention is by the way of changing start-up resistor structure, and gradually bypass start-up resistance, generated excessive dash current when so as to avoid integral bypass start-up resistor, reach the technique effect for ensureing equipment safety, reducing equipment loss.
Description
Technical field
The present invention relates to current conversion station field, espespecially a kind of novel flexible DC converter station.
Background technology
Flexible DC transmission technology is a kind of based on voltage source converter, turn-off device and pulse modulation technology
New DC transmission technology.Compared with current source type HVDC Transmission Technology of the tradition based on thyristor, flexible DC transmission technology
Have many advantages, such as controllability is high, design and construction facilitate environmental protection, take up little area and current conversion station between without communicating, regenerative resource simultaneously
Net, distributed power generation be grid-connected, island with power, urban distribution network power supply etc. has apparent advantage.Flexible DC power transmission is in recent years
To be developed rapidly.
It in flexible direct current converter station start-up course, needs to the capacitance in current conversion station into line precharge, when passing through alternating current
When charging to current conversion station, if do not divided or current limiting measures, very big dash current will be generated, thus need it is suitable
Measure control starting current.In order to reduce the charging current of start-up course, start-up resistor can be generally sealed in the loop, when
At the end of pre-charge process, bypass start-up resistance is needed.When start-up resistor bypasses, in charge circuit resistance moment be decreased to zero,
The voltage being originally applied in start-up resistor is applied on transverter.Transverter has a large amount of capacitance, and capacitance both end voltage is short
Time can cause charging current to steeply rise after increasing suddenly, i.e. di=du/dt.According to transverter charge voltage level and startup
Resistance sizes are different, and electric current when start-up resistor bypasses can reach hundreds of even upper kiloamperes, and threat is brought to equipment safety.
As shown in Figure 1 for as current conversion station rated direct voltage 500kV, when start-up resistor is 6 kilohms, the charging current of input side with it is defeated
Go out the analogous diagram of the DC voltage of side.When start-up resistor is in input state, DC voltage rises to 321kV, exits startup
Resistance exchanges input side dash current up to 630A at this time.
Therefore, current conversion station is avoided to generate excessive dash current in start-up course, ensure equipment safety, reduce equipment damage
Consumption, becomes urgent problem to be solved during current current conversion station use.
Invention content
In order to which when solving that start-up resistor exits in current current conversion station, the dash current of generation is excessive, and equipment is made to there is peace
Full hidden danger and the huge problem of loss, the main purpose of the embodiment of the present invention are to provide a kind of novel flexible DC converter
It stands, the current conversion station includes start-up resistor, transformer and transverter,
The alternating current of input handles through the transverter after the start-up resistor and the transformer and is converted to direct current
Output；
The start-up resistor is composed in series by multiple resistive segments, and each resistive segments are by a breaker and at least one resistance
It composes in parallel.
Current conversion station in through the embodiment of the present invention, by the way of changing start-up resistor structure, gradually bypass start-up is electric
Resistance, generated excessive dash current when so as to avoid integral bypass start-up resistor reach and ensure that equipment safety, reduction are set
The technique effect of standby loss.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, embodiment will be described below
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description be only the present invention some
Embodiment for those of ordinary skill in the art without having to pay creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 be in the prior art bypass start-up resistance when charging current and DC voltage analogous diagram；
Fig. 2 is a kind of structural schematic diagram of novel flexible DC converter station of the embodiment of the present invention；
Fig. 3 A and Fig. 3 B are the analogous diagram of charging current of the embodiment of the present invention and DC voltage.
Specific implementation mode
An embodiment of the present invention provides a kind of novel flexible DC converter stations.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
It is illustrated in figure 2 a kind of structural schematic diagram of novel flexible DC converter station of the embodiment of the present invention, is changed as shown in the figure
Stream station specifically includes start-up resistor 20, transformer 10 and transverter 30,
The alternating current of input is handled through the transverter 30 and is converted to after the transformer 10 and the start-up resistor 20
Direct current electricity output；
The start-up resistor 20 is composed in series by multiple resistive segments, and each resistive segments are by a breaker and at least one electricity
Resistance composes in parallel.
In the present embodiment, it includes two series resistance sections that start-up resistor 20 is represented in Fig. 2, but in start-up resistor 20
Resistive segments are not limited to two.It includes that a resistance is in parallel with a breaker that each resistive segments are also illustrated in Fig. 2, that is, electricity
It hinders R1 and circuit breaker Q F1 and constitutes a resistive segments, resistance R2 and circuit breaker Q F2 constitutes another resistive segments, but each resistive segments
In parallel resistance number be at least one, however it is not limited to one.
In the present embodiment, alternating current is inputted by power grid 40, after flowing through transformer 10 and start-up resistor 20, through transverter 30
Be converted to direct current.Wherein, transformer 10 is flowed through to can be interchanged with position of the start-up resistor 20 in figure.Start in current conversion station
Before, the breaker of resistive segments is off in start-up resistor 20, and after AC circuit breaker 70 is closed, transverter 30 starts preliminary filling
Electric process.At the end of pre-charge process is fast, according to exchange input side charging current I and DC output side DC voltage U,
Judge current precharge level, and the breaker for being gradually closed resistive segments in start-up resistor 20 opens at the end of pre-charge process
The breaker of resistive segments is all closed in dynamic resistance 20, that is, start-up resistor 20 exits completely.
As an embodiment of the present invention, the current conversion station further includes start-up resistor controller 50, for according to input
Charging current I and output DC voltage U, control the breaker closing of resistive segments in the start-up resistor 20.
In the present embodiment, start-up resistor controller 50 is provided in current conversion station, the segmentation for controlling start-up resistor 20
It puts into and exits.Before current conversion station pre-charge process starts, start-up resistor controller 50 controls all resistance in start-up resistor 20
The breaker of section disconnects, that is, is fully immersed start-up resistor 20；In pre-charge process, according to the charging current I of exchange input side
With the DC voltage U of DC output side, current precharge level is judged, control is gradually closed the disconnected of resistive segments in start-up resistor 20
Road device, at the end of pre-charge process, the breaker for controlling resistive segments in start-up resistor 20 is all closed, that is, start-up resistor
20 exit completely.
In the present embodiment, described according to the charging current I of input and the DC voltage U of output, it is electric to control startups
The breaker closing of resistive segments includes in resistance 20,
Acquire the charging current I and the DC voltage U；
Judge whether the DC voltage U reaches setting value；
When the DC voltage U is not less than setting value, and when tending towards stability the charging current I, it is closed at least one
Breaker in a resistive segments, until being closed the breaker of all resistive segments.
Wherein, start-up resistor controller 50 acquires the DC current of the charging current I and DC side output of exchange side input
U pre-sets the DC voltage value reached needed for pre-charge process.When DC voltage U reaches setting value, and friendship at this time
Galvanic electricity stream I stablizes, then controls the breaker of the resistive segments at least one start-up resistor 20, that is, control at least one resistive segments
It exits.After resistive segments exit, since 20 resistance value of start-up resistor reduces, charging current I generates concussion and as transverter charged
Journey and constantly reduce.After charging current I tends towards stability again, then at least one resistive segments of secondary control exit again, so recycle,
It is exited until controlling all resistive segments, that is, control start-up resistor 20 exits.
As an embodiment of the present invention, the transverter 30 is modularization multi-level converter, and the modularization is more
Level converter includes three phase elements, and the phase element includes upper bridge arm and lower bridge arm, and each bridge arm is more by multiple modularizations
Level converter submodule 31 is composed in series.
In the present embodiment, the transverter 30 is modularization multi-level converter, and transverter as shown in Figure 2 includes more
A Modularized multi-level converter sub-module 31, multiple Modularized multi-level converter sub-modules 31 are composed in series the upper of phase element
Underarm, upper underarm are boundary with incoming line.It is only that briefly signal, that is, the phase for only showing alternating current is shown in Fig. 2
Input, correspondingly, only shows a phase element in transverter 30, and Modularized multi-level converter sub-module 31 is interior
Portion's structure is also only brief signal, does not draw the capacitance that should include in Modularized multi-level converter sub-module 31.
In current conversion station pre-charge process, due to capacitance present in Modularized multi-level converter sub-module, it is equivalent in transverter and deposits
In a large amount of concatenated capacitances, therefore, the pre-charge process of current conversion station is the process to these capacitor chargings.
In the present embodiment, the current conversion station further includes start-up resistor controller 50, for the charging current according to input
I, the capacitance voltage U in the DC voltage U, the Modularized multi-level converter sub-module 31 of outputCAnd precharge time, control
Make the breaker closing of resistive segments in the start-up resistor 20.
Wherein, described according to the charging current I of input, the DC voltage U of output, modularization multi-level converter
Capacitance voltage U in module 31CAnd precharge time, the breaker closing for controlling resistive segments in the start-up resistor 20 include,
Acquire the charging current I, the DC voltage U and the electricity in the Modularized multi-level converter sub-module 31
Hold voltage UC；
According to the electricity in the charging current I, the DC voltage U, the Modularized multi-level converter sub-module 31
Hold voltage UCJudge precharge level with the precharge time；
According to the precharge level, the breaker closing of resistive segments in the start-up resistor 20 is controlled.
In the present embodiment, start-up resistor controller 50 acquires charging current I, DC voltage U and modular multilevel and changes
Flow the capacitance voltage U in device submodule 31C, and combine pre-set precharge time, judge current precharge level, when up to
To after preset target precharge level, the breaker of resistive segments in start-up resistor 20 is gradually controlled.Wherein, preset precharge
Time and target precharge level can be configured according to the different demands of different current conversion stations in practice.
In the present embodiment, the current conversion station further includes multiple bridge arm reactors 60 and multiple direct current reactors 80, described
Multiple bridge arm reactors 60 are series between the upper bridge arm and lower bridge arm, and the multiple direct current reactor 80 is connected to described change
It flows between device and the positive or negative pole of the DC voltage.
Wherein, as shown in Fig. 2, further including multiple bridge arm reactors 60 and multiple direct current reactors 80, bridge arm in current conversion station
Reactor 60 is series between the upper and lower bridge arm in transverter, and direct current reactor 80 is connected in series in transverter and direct current anode
Outlet side one end is only shown or between cathode, in Fig. 2 to have connected direct current reactor 80.Bridge arm reactor 60 and direct current reactance
Device 80 plays the role of current limliting and filtering.
As an embodiment of the present invention, the current conversion station further includes AC circuit breaker 70, for controlling the exchange
The input of electricity.
In the present embodiment, AC circuit breaker 70 is series at exchange input side, i.e., circuit breaker Q F shown in Fig. 2 works as exchange
When breaker 70 is closed, current conversion station starts, and starts pre-charge process；When AC circuit breaker 70 disconnects, current conversion station is stopped.
By the current conversion station in the embodiments of the present invention, by the way of changing start-up resistor structure, gradually bypass is opened
Dynamic resistance, generated excessive dash current when so as to avoid integral bypass start-up resistor reach and ensure equipment safety, subtract
The technique effect of skinny device loss.
If Fig. 3 A and Fig. 3 B show charging current of the embodiment of the present invention and the analogous diagram of DC voltage, when current conversion station is specified
Start-up resistor is divided into 5K Ω+1K two resistive segments of Ω, start-up resistor by DC voltage 500kV when start-up resistor is 6 kilohms
Bypass is completed in two stages.Bypass 5K Ω resistive segments for the first time, second of bypass 1K Ω resistive segments.When bypass 5K Ω resistive segments
When, exchange side maximum impact charging current is 26A, as shown in Figure 3A；When bypassing 1K Ω resistive segments, exchange side maximum impact is filled
Electric current is 80A, as shown in Figure 3B.
In the present embodiment, with charging current when the resistance of bypass start-up in the prior art shown in FIG. 1 and DC voltage
Analogous diagram is compared, it can be seen that in Fig. 1 when start-up resistor is in input state, DC voltage rises to 321kV, exits and opens
Dynamic resistance, the side impact charging current of exchange input at this time is up to 630A.And the current conversion station in the embodiment of the present invention, DC voltage
When reaching 321kV, when bypassing first resistive segments, maximum impact charging current is 26A, after charging current is stablized, closure the
Breaker in two resistive segments, maximum impact charging current are 80A.Obviously, compared with the prior art in direct bypass start-up
Charging current is impacted caused by resistance, generated impact charging current is much smaller in the present invention.
By the current conversion station in the embodiments of the present invention, by the way of changing start-up resistor structure, gradually bypass is opened
Dynamic resistance, generated excessive dash current when so as to avoid integral bypass start-up resistor reach and ensure equipment safety, subtract
The technique effect of skinny device loss.
One of ordinary skill in the art will appreciate that implementing the method for the above embodiments can lead to
It crosses program and is completed to instruct relevant hardware, which can be stored in a computer read/write memory medium, such as
ROM/RAM, magnetic disc, CD etc..
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical solution and advantageous effect
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection domain of invention.
Claims (8)
1. a kind of novel flexible DC converter station, which is characterized in that the current conversion station includes start-up resistor, transformer and the change of current
Device,
It is defeated that the alternating current of input is converted to direct current after the start-up resistor and the transformer, through transverter processing
Go out；
The start-up resistor is composed in series by multiple resistive segments, and each resistive segments are by a breaker and at least one resistor coupled in parallel
Composition.
2. a kind of novel flexible DC converter station according to claim 1, which is characterized in that the current conversion station further includes opening
Dynamic resistance controller, for according to the charging current of input and the DC voltage of output, controlling resistive segments in the start-up resistor
Breaker closing.
3. a kind of novel flexible DC converter station according to claim 2, which is characterized in that the charging according to input
The DC voltage of electric current and output, the breaker closing for controlling resistive segments in the start-up resistor include,
Acquire the charging current and the DC voltage；
Judge whether the DC voltage reaches setting value；
When the DC voltage is not less than setting value, and when tending towards stability the charging current, it is closed at least one resistance
Breaker in section, until being closed the breaker of all resistive segments.
4. a kind of novel flexible DC converter station according to claim 1, which is characterized in that the transverter is modularization
Multilevel converter, the modularization multi-level converter include three phase elements, and the phase element includes upper bridge arm and lower bridge
Arm, each bridge arm are composed in series by multiple Modularized multi-level converter sub-modules.
5. a kind of novel flexible DC converter station according to claim 4, which is characterized in that the current conversion station further includes opening
Dynamic resistance controller, for according to the charging current of input, the DC voltage of output, the modularization multi-level converter submodule
Capacitance voltage in the block and precharge time control the breaker closing of resistive segments in the start-up resistor.
6. a kind of novel flexible DC converter station according to claim 5, which is characterized in that the charging according to input
Electric current, the DC voltage of output, the capacitance voltage in the Modularized multi-level converter sub-module and precharge time, control
The breaker closing of resistive segments includes in the start-up resistor,
Acquire the charging current, the DC voltage and the capacitance voltage in the Modularized multi-level converter sub-module；
According in the charging current, the DC voltage, the Modularized multi-level converter sub-module capacitance voltage with
The precharge time judges precharge level；
According to the precharge level, the breaker closing of resistive segments in the start-up resistor is controlled.
7. a kind of novel flexible DC converter station according to claim 5, which is characterized in that the current conversion station further includes more
A bridge arm reactor and multiple direct current reactors, the multiple bridge arm reactor are series between the upper bridge arm and lower bridge arm,
The multiple direct current reactor is connected between the transverter and the positive or negative pole of the DC voltage.
8. a kind of novel flexible DC converter station according to claim 1, which is characterized in that the current conversion station further includes handing over
Flow breaker, the input for controlling the alternating current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810370231.XA CN108322036A (en) | 2018-04-24 | 2018-04-24 | A kind of novel flexible DC converter station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810370231.XA CN108322036A (en) | 2018-04-24 | 2018-04-24 | A kind of novel flexible DC converter station |
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| CN108322036A true CN108322036A (en) | 2018-07-24 |
Family
ID=62895352
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| CN201810370231.XA Pending CN108322036A (en) | 2018-04-24 | 2018-04-24 | A kind of novel flexible DC converter station |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110034575A (en) * | 2019-04-10 | 2019-07-19 | 中国能源建设集团广东省电力设计研究院有限公司 | Method for arranging suitable for extra-high voltage large capacity flexible direct current converter station starting-up later time |
| WO2021197465A1 (en) * | 2020-04-03 | 2021-10-07 | 南京南瑞继保电气有限公司 | Test system and test method for converter station in flexible direct current transmission |
| WO2022121828A1 (en) * | 2020-12-08 | 2022-06-16 | 华为数字能源技术有限公司 | Power conversion circuit, control method for power conversion circuit, and transformer |
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