CN110265987A - A kind of resistance sense type active DC Line Fault current limiter topology - Google Patents
A kind of resistance sense type active DC Line Fault current limiter topology Download PDFInfo
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- CN110265987A CN110265987A CN201910535962.XA CN201910535962A CN110265987A CN 110265987 A CN110265987 A CN 110265987A CN 201910535962 A CN201910535962 A CN 201910535962A CN 110265987 A CN110265987 A CN 110265987A
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- current limiter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
Abstract
The present invention relates to a kind of resistance sense type active DC Line Fault current limiter topologys, belong to multiterminal element, DC grid technical field；The current limiter includes two main branch roads, respectively on-state low-loss branch and main current limiter branch, wherein on-state low-loss branch routing load switch and supper-fast mechanical switch composition, main current limiter are made of thyristor, commutation capacitor, current-limiting inductance, current-limiting resistance and four groups of H bridge type diodes.The topological structure carries out current commutation twice using recharged capacitance, is carried out using failure process to commutation capacitor charging.Result of study shows that the current limiter can effectively inhibit increase in current, reduces increase in current rate, and have good economy.
Description
Technical field
The present invention relates to a kind of resistance sense type active DC Line Fault current limiters suitable for multiterminal element and DC grid to open up
It flutters, belongs to multiterminal element, DC grid field.
Background technique
DC grid is higher and higher in specific gravity in the power system, and fault clearance is always to study in DC grid
Hot and difficult issue.Flexible DC transmission is the technology of transmission of electricity of new generation based on all-controlling power electronics device, is the following power grid hair
One of exhibition and the important directions changed.In the remote high power DC power transmission engineering of high voltage, overhead line has obvious economical
Property, but its DC side high failure rate, and half-bridge submodule does not have DC Line Fault Scavenging activity.If short trouble, failure occurs
Electric current will rise very rapidly up to more than ten times of rated current, and process is very rapid, need to cut off fault current at this time, disconnected by direct current
Road device cuts off failure, improves the reliability of system.But with the continuous improvement of DC grid capacity, the skill of DC Line Fault breaker
Art difficulty gradually rises, and cost is also constantly increasing.By give breaker match current limiter, can reduce dc circuit breaker at
Sheet and technical difficulty are of great significance simultaneously for DC grid protection.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of resistance sense type active DC Line Fault current limiters
Topology.
The technical scheme adopted by the invention is that: load current is through-flow by low-loss branch when normal operation, after failure
Electric current, which flows through commutation branch, realizes the change of current twice, and current-limiting resistance and current-limiting inductance are connected to the grid.Mentioned current limiter can be effective
Inhibit increase in current, and there is good economy.
Compared with prior art, the present invention has the advantage that are as follows:
1, the current-limiting resistance and current-limiting inductance are in parallel, and being both able to achieve reduces fault current amplitudes and reduction fault current rising
Rate, and current-limiting inductance dissipation of energy can be realized after breaker disconnection, arrester energy in breaker is reduced, is shortened entire
The time required to excision process；
2, the current limiter topology can effectively inhibit fault current, and DC grid can be greatly reduced to the technology of breaker
Demand；
3, the current limiter topology can reduce the usage quantity of power electronic devices, and economy is good；
4, the H bridge structure that the current limiter topology is made of 4 groups of diodes, has bidirectional current limiting ability.
Detailed description of the invention
The following further describes the present invention with reference to the drawings.
Fig. 1 is a kind of structural schematic diagram of resistance sense type active DC Line Fault current limiter topology；
Current path figure when Fig. 2 is capacitor charging；
Fig. 3 is second of converting commutating current path schematic diagram；
Fig. 4 is schematic diagram in current-limiting resistance and inductance investment circuit.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description.
A kind of resistance sense type active DC Line Fault current limiter topological structure is as shown in Figure 1, include on-state low-loss branch, master
Current limiter branch, wherein on-state low-loss branch includes supper-fast mechanical switch and load changeover switch, main current limiter branch packet
Include current commutation branch and in current commutation branch two sides four groups of H bridge type diode groups in parallel.H bridge is constituted using four groups of diodes
Type realizes bidirectional current limiting.On the right side of current limiter when failure, D1, D4 are connected, on the left of current limiter when failure, D2, D3 conducting.
After current path figure is as shown in Fig. 2, break down when capacitor charging, when detect fault current be more than rated current
20% when, protective device issues instruction, gives LCS module cut-off signals, while triggering T2, Td, and opens to supper-fast machinery
It closes and issues separating brake instruction.Fault current flows through current commutation branch T2, and electric current is transferred quickly in T2.Meanwhile by direct current system
System flows through concatenated C3, Rd and Cd branch as charge power supply for capacitor C3 charging.
Second of converting commutating current path schematic diagram as shown in figure 3, capacitor C3 voltage gradually becomes just during the charging process
Lower negative, thyristor T4 conducting, current-limiting resistance and current-limiting inductance put into circuit, while capacitor C3 branch current is smaller and smaller, finally
It is zero.
Schematic diagram in current-limiting resistance and inductance investment circuit is as shown in figure 4, other commutation branches turn off at this time, only thyristor
The conducting of T4 branch.
It is illustrated by above-mentioned it is found that a kind of resistance sense type active DC Line Fault current limiter proposed is in high-voltage dc transmission
The advantages of electrical domain has bidirectional current limiting ability, effectively inhibits increase in current and reduce increase in current rate.
Finally it should be noted that: described embodiment is only some embodiments of the present application, rather than whole realities
Apply example.Based on the embodiment in the application, those of ordinary skill in the art are obtained without making creative work
Every other embodiment, shall fall in the protection scope of this application.
Claims (6)
1. a kind of resistance sense type active DC Line Fault current limiter topology suitable for multiterminal element and DC grid, feature exist
In: branch, main current limiter branch is lost including on-state bottom.On-state bottom loss branch includes supper-fast mechanical switch (UFD), load
Change-over switch (LCS), wherein LCS is made of in series and parallel IGBT valve group T1 and diode valve group D；Main current limiter branch includes brilliant lock
Pipe valve group T2, thyristor controlled series compensation T3, commutation capacitor C3, derided capacitors Cd, divider resistance Rd, thyristor controlled series compensation T4, current-limiting reactor L
With current-limiting resistance R.
2. a kind of resistance sense type active DC Line Fault current limiter topology according to claim 1, it is characterised in that: utilize event
The charging process of barrier process progress commutation capacitor.After breaking down, when detecting that fault current is more than the 20% of rated current,
Protective device issues instruction, gives LCS module cut-off signals, while triggering T2, Td, and issues separating brake to supper-fast mechanical switch
Instruction.Fault current flows through current commutation branch T2, and electric current is transferred quickly in T2.Meanwhile by direct current system as charging
Power supply flows through concatenated C3, Rd and Cd branch for capacitor C3 charging.
3. a kind of resistance sense type active DC Line Fault current limiter topology according to claim 1, it is characterised in that: precharge
Capacitor realizes commutation twice.Thyristor T2 shutdown is realized in first time commutation, and electric current is transferred to branch where T3, and second of commutation is real
Existing thyristor T4 conducting, electric current are transferred to T4 branch.
4. a kind of resistance sense type active DC Line Fault current limiter device topology according to claim 1, it is characterised in that: utilize
Four groups of diodes constitute H bridge type and realize bidirectional current limiting.On the right side of current limiter when failure, D1, D4 are connected, on the left of current limiter when failure,
D2, D3 conducting.
5. a kind of resistance sense type active DC Line Fault current limiter device topology according to claim 1, it is characterised in that: current limliting
Resistance limits current amplitude, and current-limiting inductance limits current rise rate.
6. a kind of resistance sense type active DC Line Fault current limiter device topology according to claim 1, it is characterised in that: current limliting
Resistance and current-limiting inductance are in parallel, and breaker realizes current-limiting inductance dissipation of energy after disconnecting, and reduce arrester energy in breaker,
The time required to shortening entire excision process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910535962.XA CN110265987A (en) | 2019-06-20 | 2019-06-20 | A kind of resistance sense type active DC Line Fault current limiter topology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910535962.XA CN110265987A (en) | 2019-06-20 | 2019-06-20 | A kind of resistance sense type active DC Line Fault current limiter topology |
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| CN201910535962.XA Pending CN110265987A (en) | 2019-06-20 | 2019-06-20 | A kind of resistance sense type active DC Line Fault current limiter topology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111740395A (en) * | 2020-05-21 | 2020-10-02 | 东北电力大学 | Topological structure of inductive coupling type high-voltage direct-current limiting circuit breaker |
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| CN108092253A (en) * | 2017-12-29 | 2018-05-29 | 东南大学 | A kind of DC grid capacitive mixed DC breaker and its control method |
| CN108123427A (en) * | 2018-01-17 | 2018-06-05 | 华北电力大学 | A kind of inductive type bidirectional, dc current limiter topology |
| US20180248363A1 (en) * | 2017-02-27 | 2018-08-30 | Huazhong University Of Science And Technology | Fault current limiter |
| CN108879750A (en) * | 2018-06-29 | 2018-11-23 | 国网浙江省电力有限公司杭州供电公司 | A kind of fault processing system and its control method of Multi-end flexible direct current transmission route |
| CN109728571A (en) * | 2018-12-19 | 2019-05-07 | 华北电力大学 | A kind of hybrid fault current limiter of capacitor commutation and its control method |
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2019
- 2019-06-20 CN CN201910535962.XA patent/CN110265987A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180248363A1 (en) * | 2017-02-27 | 2018-08-30 | Huazhong University Of Science And Technology | Fault current limiter |
| CN108092253A (en) * | 2017-12-29 | 2018-05-29 | 东南大学 | A kind of DC grid capacitive mixed DC breaker and its control method |
| CN108123427A (en) * | 2018-01-17 | 2018-06-05 | 华北电力大学 | A kind of inductive type bidirectional, dc current limiter topology |
| CN108879750A (en) * | 2018-06-29 | 2018-11-23 | 国网浙江省电力有限公司杭州供电公司 | A kind of fault processing system and its control method of Multi-end flexible direct current transmission route |
| CN109728571A (en) * | 2018-12-19 | 2019-05-07 | 华北电力大学 | A kind of hybrid fault current limiter of capacitor commutation and its control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111740395A (en) * | 2020-05-21 | 2020-10-02 | 东北电力大学 | Topological structure of inductive coupling type high-voltage direct-current limiting circuit breaker |
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Application publication date: 20190920 |