CN208063040U - A kind of novel flexible DC converter station - Google Patents
A kind of novel flexible DC converter station Download PDFInfo
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- CN208063040U CN208063040U CN201820585896.8U CN201820585896U CN208063040U CN 208063040 U CN208063040 U CN 208063040U CN 201820585896 U CN201820585896 U CN 201820585896U CN 208063040 U CN208063040 U CN 208063040U
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Abstract
The utility model provides a kind of novel flexible DC converter station, and 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 utility model is by the way of changing start-up resistor structure, gradually bypass start-up resistance, generated excessive dash current when so as to avoid integral bypass start-up resistor reaches the technique effect for ensureing equipment safety, reducing equipment loss.
Description
Technical field
The utility model is related 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.
Utility model 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 utility model embodiment are to provide a kind of novel flexible direct current and change
Stream station, 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.
By the current conversion station in the utility model embodiment, 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.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only that this practicality is new
Some embodiments of type for those of ordinary skill in the art without having to pay creative labor, can be with
Obtain other attached drawings according to these 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 utility model embodiment；
Fig. 3 A and Fig. 3 B are the analogous diagram of the utility model embodiment charging current and DC voltage.
Specific implementation mode
The utility model embodiment provides a kind of novel flexible DC converter station.
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
The every other embodiment obtained, 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 utility model embodiment, institute in figure
Show that current conversion 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, transverter 30 starts to be pre-charged
Journey.At the end of pre-charge process is fast, according to the DC voltage U of the charging current I and DC output side of exchange input side, judge
Current precharge level, and it is gradually closed the breaker of resistive segments in start-up resistor 20, at the end of pre-charge process, start electricity
The breaker of resistive segments is all closed in resistance 20, that is, start-up resistor 20 exits completely.
As one embodiment of the utility model, the current conversion station further includes start-up resistor controller 50, for acquiring
The charging current I of the input and DC voltage U of output, according to the DC voltage of the charging current I and the output of the input
U controls 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.
As one embodiment of the utility model, the transverter 30 is modularization multi-level converter, the module
It includes three phase elements to change multilevel converter, and the phase element includes upper bridge arm and lower bridge arm, and each bridge arm is by multiple modules
Change multilevel converter submodule 31 to be composed in series.
In the present embodiment, the transverter is modularization multi-level converter, and transverter as shown in Figure 2 includes multiple
Modularized multi-level converter sub-module 31, multiple Modularized multi-level converter sub-modules 31 are composed in series the upper and lower of phase element
Arm, upper underarm are boundary with incoming line.It is only briefly signal shown in Fig. 2, that is, the phase for only showing alternating current is defeated
Enter, correspondingly, only shows a phase element in transverter 30, and the inside of Modularized multi-level converter sub-module 31
Structure is also only brief signal, does not draw the capacitance that should include in Modularized multi-level converter sub-module 31.It is changing
In the pre-charge process of stream station, due to capacitance present in Modularized multi-level converter sub-module, it is equivalent in transverter and exists
A large amount of concatenated capacitances, therefore, the pre-charge process of current conversion station are the process to these capacitor chargings.
In the present embodiment, the current conversion station further includes start-up resistor controller 50, the charging current for acquiring input
I, the capacitance voltage U in the DC voltage U Yu the Modularized multi-level converter sub-module 31 of outputC, control the startup
The breaker closing of resistive segments in resistance 20.
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 one embodiment of the utility model, the current conversion station further includes AC circuit breaker 70, described for controlling
The input of alternating current.
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.
It is gradually other by the way of changing start-up resistor structure by the current conversion station in above-mentioned the utility model embodiment
Road start-up resistor, generated excessive dash current when so as to avoid integral bypass start-up resistor reach and ensure equipment peace
Entirely, reduce the technique effect of equipment loss.
If Fig. 3 A and Fig. 3 B show the utility model embodiment charging current and the analogous diagram of DC voltage, work as current conversion station
Start-up resistor is divided into 5K Ω+1K two resistive segments of Ω by rated direct voltage 500kV when start-up resistor is 6 kilohms, is started
Resistance 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 electricity
When hindering section, exchange side maximum impact charging current is 26A, as shown in Figure 3A；When bypassing 1K Ω resistive segments, exchange side most favourable opposition
It is 80A to hit charging current, 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 utility model embodiment, direct current
When voltage reaches 321kV, when bypassing first resistive segments, maximum impact charging current is that 26A is closed after charging current is stablized
The breaker in second resistor section is closed, maximum impact charging current is 80A.Obviously, compared with the prior art in directly bypass
Charging current is impacted caused by start-up resistor, generated impact charging current is much smaller in the utility model.
It is gradually other by the way of changing start-up resistor structure by the current conversion station in above-mentioned the utility model embodiment
Road start-up resistor, generated excessive dash current when so as to avoid integral bypass start-up resistor reach and ensure equipment peace
Entirely, reduce the technique effect of equipment loss.
Particular embodiments described above has carried out into one the purpose of this utility model, technical solution and advantageous effect
Step is described in detail, it should be understood that the foregoing is merely specific embodiment of the utility model, is not used to limit this
The protection domain of utility model, within the spirit and principle of the utility model, any modification for being made, changes equivalent replacement
Into etc., it should be included within the scope of protection of this utility model.
Claims (6)
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, the DC voltage of charging current and output for acquire input, according to the charging current of the input and
The DC voltage of the output controls the breaker closing of resistive segments in the start-up resistor.
3. 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.
4. a kind of novel flexible DC converter station according to claim 3, which is characterized in that the current conversion station further includes opening
Dynamic resistance controller, for acquiring the charging current of input, DC voltage and the modularization multi-level converter of output
Mould capacitance voltage in the block, controls the breaker closing of resistive segments in the start-up resistor.
5. a kind of novel flexible DC converter station according to claim 4, 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.
6. 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 |
|---|---|---|---|
| CN201820585896.8U CN208063040U (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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| CN201820585896.8U CN208063040U (en) | 2018-04-24 | 2018-04-24 | A kind of novel flexible DC converter station |
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| CN208063040U true CN208063040U (en) | 2018-11-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258599A (en) * | 2021-07-13 | 2021-08-13 | 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 | Starting control device and method of multi-terminal direct current transmission system |
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2018
- 2018-04-24 CN CN201820585896.8U patent/CN208063040U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258599A (en) * | 2021-07-13 | 2021-08-13 | 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 | Starting control device and method of multi-terminal direct current transmission system |
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