CN110112718A - A kind of resistance sense type blended learning topology using precharge commutation capacitor - Google Patents
A kind of resistance sense type blended learning topology using precharge commutation capacitor Download PDFInfo
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- CN110112718A CN110112718A CN201910433443.2A CN201910433443A CN110112718A CN 110112718 A CN110112718 A CN 110112718A CN 201910433443 A CN201910433443 A CN 201910433443A CN 110112718 A CN110112718 A CN 110112718A
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- precharge
- current
- branch
- commutation capacitor
- resistance sense
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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
- H02H9/021—Current limitation using saturable reactors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The present invention relates to a kind of resistance sense type blended learning topologys using precharge commutation capacitor, are suitable for 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 changeover switch (LCS) and supper-fast mechanical switch (UFD) composition, main current limiter branch routing resistance sense element, the precharge composition such as commutating capacitor and thyristor；Resistance sense element is incorporated to fault current circuit by time current limliting, two stages of main current limliting using precharge commutation capacitor by current limiter.
Description
Technical field
The present invention relates to a kind of resistance sense type blended learning topologys using precharge commutation capacitor, and it is straight to be suitable for multiterminal
Stream, DC grid technical field.
Background technique
DC grid is higher and higher in specific gravity shared in the power system, and fault clearance is always to grind in DC grid
The hot and difficult issue studied carefully.However multiterminal flexible direct current power grid is " low inertia, a underdamping " system, when short circuit occurs for DC side
When failure, each converter station can to fault point feed-in electric current, the fault current rate of climb quickly, failure initial stage current-rising-rate meeting
Much larger than the current-rising-rate of AC system short trouble, the magnitude of several kA/ms can reach.Due to the failure of DC line fault
Electric current does not have zero crossing, so zero crossing arc extinguishing cannot be utilized as ac transmission, this brings to the realization of dc circuit breaker
Very big difficulty.Currently used DC grid fault current limiter mainly includes superconductive current limiter, solid-state current limiter and mixes
Close current limiter.Superconductive current limiter quenches automatically when electric current steeply rises by utilizing superconductor physical property, shows as resistance
Characteristic hinders fault current further up.Its shortcomings that, is to require manufacturing cost and application high.Solid-state current limliting
Device series connection in stable state enters main circuit, once fault-signal is detected, immediately by the movement of power electronic devices in failure
Resistance or inductance are sealed in circuit.Solid-state current limiter needs a large amount of power electronic devices to meet high voltage and big electricity in series and parallel
Stream, caused by on-state loss it is relatively high.Also occur being suitable for some hybrid direct current limiters of high-voltage direct current power grid at present, still
Substantially Medial & Low Voltage Power Network is concentrated on.
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 types using precharge commutation capacitor
Blended learning topology.
It is an object of the invention to be suitable for high-voltage direct current power grid, fault current is reduced, is limited on the electric current of short trouble
Lifting speed reduces current limiter cost.
The technical scheme adopted by the invention is that: when detecting failure after DC line fault generation, triggering failure transfer
Branch thyristor issues the order of load transition change-over switch open command and the disconnection of supper-fast mechanical switch.To supper-fast machine
After tool switch disconnects, triggering precharge commutation capacitor branch is pre-charged commutation capacitor branch at this time and props up into the secondary current limliting stage
Road electric current also starts to be gradually decrease to zero.
Compared with prior art, the present invention has the advantage that are as follows:
1) on-state low-loss branch is formed using load changeover switch and supper-fast mechanical switch, on-state loss is low.
2) using current-limiting resistance and the comprehensive current limliting of current-limiting reactor, effectively inhibit DC grid short circuit current, while slowing down event
Hinder the electric current rate of climb, current limitation effect is good preferably.
3) cooperated by current limiter and breaker, reduce breaker working condition requirement, make the entirety of current limiter and breaker
Cost decline, good economy performance.
4) bidirectional current limiting may be implemented.
Detailed description of the invention
The following further describes the present invention with reference to the drawings.
Fig. 1 shows a kind of resistance sense type blended learning topological structure schematic diagram using precharge commutation capacitor, packet
It includes and changes on-state low-loss branch and main current limiter branch, on-state low-loss branch routes load changeover switch and supper-fast mechanical switch
Composition, main current limiter branch routing resistance sense element, the precharge composition such as commutating capacitor and thyristor；
Fig. 2 shows current limiter time current limliting stage current paths；
Fig. 3 shows current limiter main current limliting stage current path；
Fig. 4 shows the logical sequence of each device in current limiter.
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.
It is a kind of to use the resistance sense type blended learning topological structure for being pre-charged commutation capacitor as shown in Figure 1, the current limiter
Including two main branch roads, respectively on-state low-loss branch and main current limiter branch, wherein on-state low-loss branch routing overhead
Change-over switch and supper-fast mechanical switch composition, main current limiter branch routing resistance sense element, precharge commutating capacitor and thyristor
Deng.Fig. 2 is primary current transition phase, and current-limiting resistance seals in circuit completely at this time, in current-limiting inductance step by step input circuit.Fig. 3
For the main current limliting stage, being pre-charged commutation capacitor branch at this time is zero, and fault current flows completely through current-limiting inductance branch.Fig. 4 is each
A time point, each device logical sequence of current limiter.
t0Before moment, system powers to the load by on-state low-loss branch:
t0After moment, fault current continues flow through low-loss branch；
t1Moment, protective device detect failure, trigger VT1a、VT2a, and issued to load switch (LCS)
Disjunction instruction and supper-fast mechanical switch (UFD) issue separating brake instruction.Electric current is transferred to VT1aAnd VT2aPlace branch.
t2Moment triggers VTc, VTa.Capacitor CcWith R3Form access, VT2aDue to being turned off by backward voltage.Electric current
It is transferred to CcPlace branch.
t3Moment, fault current are fully transferred to L3Branch, current-limiting resistance and current-limiting inductance put into fault current, current limiter
Action process is completed.
t4Moment, breaker actuation.
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 (5)
1. a kind of resistance sense type blended learning topology using precharge commutation capacitor, it is characterised in that: including the low damage of on-state
Consume branch (1), main current limiter branch (2)；Wherein on-state low-loss branch includes load switch, half control type device crystalline substance lock
Pipe, Fast mechanical switch, conducting wire etc.；Main current limiter branch includes half control type device thyristor, precharge commutation capacitor, current limliting electricity
Resistance, current-limiting inductance etc..
2. a kind of resistance sense type blended learning topology using precharge commutation capacitor according to claim 1, special
Sign is: so that fault current circuit is changed road by being pre-charged commutation capacitor, in the process to charge to precharge commutation capacitor branch
In, precharge commutation capacitor branch trouble electric current is gradually reduced to zero.
3. a kind of resistance sense type blended learning topology using precharge commutation capacitor according to claim 1, special
Sign is: main current limiter branch routing half control type device thyristor, precharge commutation capacitor, current-limiting resistance, current-limiting inductance composition are opened up
Structure is flutterred, resistance sense element is incorporated in fault current using precharge commutation capacitor, realizes metering function.
4. a kind of resistance sense type blended learning topology using precharge commutation capacitor according to claim 1, special
Sign is: when detecting failure after DC line fault generation, triggering failure shifts branch thyristor, issues load transition conversion
The order that switch-off command and supper-fast mechanical switch disconnect.After the disconnection of supper-fast mechanical switch, triggering precharge commutation
Capacitive branch, into the secondary current limliting stage, the inductive branch electric current with precharge commutation capacitor branch circuit parallel connection also starts gradually at this time
Increase, until precharge commutation capacitor branch current is zero.
5. a kind of resistance sense type blended learning topology using precharge commutation capacitor according to claim 1, special
Sign is: bidirectional current limiting may be implemented in the topological structure, wherein when breaking down on the right side of current limiter, under be designated as the thyristor of a
Work；Break down on the left of current limiter, under be designated as b thyristor work.Reduce current limiter investment, reduce DC grid at
This.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910433443.2A CN110112718A (en) | 2019-05-23 | 2019-05-23 | A kind of resistance sense type blended learning topology using precharge commutation capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910433443.2A CN110112718A (en) | 2019-05-23 | 2019-05-23 | A kind of resistance sense type blended learning topology using precharge commutation capacitor |
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| Publication Number | Publication Date |
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| CN110112718A true CN110112718A (en) | 2019-08-09 |
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| CN201910433443.2A Pending CN110112718A (en) | 2019-05-23 | 2019-05-23 | A kind of resistance sense type blended learning topology using precharge commutation capacitor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180137993A1 (en) * | 2016-11-11 | 2018-05-17 | Xi'an Jiaotong University | Magnetic pulse inducted transfer-type dc circuit breaker |
| CN108123427A (en) * | 2018-01-17 | 2018-06-05 | 华北电力大学 | A kind of inductive type bidirectional, dc current limiter topology |
| CN109510182A (en) * | 2018-10-30 | 2019-03-22 | 华北电力大学 | A kind of hybrid fault current limiter of resistance sense type and its control method |
| CN109586260A (en) * | 2018-10-30 | 2019-04-05 | 华北电力大学 | A kind of resistance sense type capacitor commutation blended learning and its control method |
| 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 |
-
2019
- 2019-05-23 CN CN201910433443.2A patent/CN110112718A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180137993A1 (en) * | 2016-11-11 | 2018-05-17 | Xi'an Jiaotong University | Magnetic pulse inducted transfer-type dc circuit breaker |
| CN108123427A (en) * | 2018-01-17 | 2018-06-05 | 华北电力大学 | A kind of inductive type bidirectional, dc current limiter topology |
| CN109510182A (en) * | 2018-10-30 | 2019-03-22 | 华北电力大学 | A kind of hybrid fault current limiter of resistance sense type and its control method |
| CN109586260A (en) * | 2018-10-30 | 2019-04-05 | 华北电力大学 | A kind of resistance sense type capacitor commutation blended learning and its control method |
| 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 |
Non-Patent Citations (1)
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| 许建中 等: "电流换相H桥型混合式直流故障限流器", 《中国电机工程学报》 * |
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Application publication date: 20190809 |
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