CN110265982A - A kind of hybrid dc circuit breaker based on LC buffer current-limiting circuit - Google Patents
A kind of hybrid dc circuit breaker based on LC buffer current-limiting circuit Download PDFInfo
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- CN110265982A CN110265982A CN201910529757.2A CN201910529757A CN110265982A CN 110265982 A CN110265982 A CN 110265982A CN 201910529757 A CN201910529757 A CN 201910529757A CN 110265982 A CN110265982 A CN 110265982A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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Abstract
The present invention relates to field of power electronics, it is desirable to provide a kind of hybrid dc circuit breaker based on LC buffer current-limiting circuit.The breaker is made of auxiliary branch and main branch two parts in parallel, is respectively equipped with auxiliary dc switch and main dc switch；Wherein, auxiliary dc switch is composed in series by quick isolation switch and IGBT valve group, and main dc switch is composed in parallel by IGBT valve group with metal oxide arrester；Be arranged in series LC buffer current-limiting circuit, structure in the main branch are as follows: buffering capacitor first it is in parallel with metal oxide arrester, then with antiparallel thyristor valve tandem, it is finally in parallel with current-limiting inductance to form LC buffer current-limiting circuit.The present invention buffers current limliting circuit using LC, can effectively fault current limiting rise, reduce drop-out current, reduces MOA energy dissipation, accelerate faulty line and cut off speed.By using half control type device thyristor, wholly-controled device IGBT quantity is reduced, to reduce control difficulty and system cost, designs reasonable, at low cost, high reliablity.
Description
Technical field
The invention belongs to field of power electronics, and in particular to a kind of hybrid direct current interruption based on LC buffer current-limiting circuit
Device (DCCB).
Background technique
After flexible DC transmission technology (VSC-HVDC) occurs, building flexible direct current power grid has been increasingly becoming electric power work
One new developing direction of industry.By the research and development in more than 10 years, voltage source converter (VSC) is widely used to
The occasions such as asynchronous Power System Interconnection, distributed energy access, island power supply, become basis and the core of flexible direct current electric power network technique.
Nowadays, modularization multi-level converter (MMC) at home and abroad uses in multinomial flexible direct current electricity power engineering, becomes the neck
The most valuable topology in domain.
In the flexible direct current power grid being made of MMC converter station, short trouble (including the list of DC side generation how is coped with
Pole ground connection and bipolar short circuit) it is main problem present in current application.On the one hand, DC grid failure and AC network failure
Difference, fault current does not have zero crossing, thus the AC circuit breaker of technology maturation can not be applied directly in DC Line Fault；Separately
On the one hand, the DC grid fault current rate of climb is much higher than AC network, therefore wants to the speed of cut-offfing of dc circuit breaker
Ask very high.The dc circuit breaker that research can adapt to current flexible DC transmission requirement of engineering has attracted domestic and international research people
The extensive concern of member.
The dc circuit breaker type of current research mainly includes mechanical, solid state and 3 kinds hybrid.Wherein, mechanically
Breaker has the advantages such as stable, on-state loss is small, control mode is simple, but switch off time is longer, and relies primarily on vibration
It swings circuit and realizes current over-zero, it is more demanding to circuit parameter.Solid state breaker all uses power electronic devices realization pair
The on-off of electric current, cut-offs that speed is fast, high reliablity, but on-state loss is larger when operating normally, and a large amount of switching devices cause into
This is excessively high, lacks the practicability in high-voltage fence.And hybrid circuit breaker has both the advantages of mechanical and solid state breaker,
Not only it can realize lesser on-state loss when normal operation, but also be able to satisfy the demand of quick disengagement failure electric current, therefore become disconnected at present
The Main way of road device research.But current hybrid circuit breaker needs a large amount of IGBT series-parallel, this not only adds equal
Pressure, the control difficulty flowed, while the cost and volume of breaker are substantially increased, in addition, many hybrid direct currents are disconnected at present
Road device does not have current limiting capacity, this limits to application of the breaker in multiterminal element power grid, practical disjunction failure electricity
Pressure is larger when stream.In view of the demand of the following building multiterminal element power grid, Low-cost, high performance current-limiting type are hybrid
Dc circuit breaker is of great significance.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a kind of based on LC buffering current limliting electricity
The hybrid dc circuit breaker on road.
In the present invention, a kind of hybrid dc circuit breaker based on LC buffer current-limiting circuit, by parallel auxiliary branch and
Main branch two parts composition, is respectively equipped with auxiliary dc switch and main dc switch；Wherein, auxiliary dc switch is by quickly isolating
Switch S1 and IGBT valve group T1 is composed in series, and main dc switch is by parallel with metal oxide arrester MOA group of IGBT valve group T2
At；It is arranged in series LC buffer current-limiting circuit, structure in the main branch are as follows: a buffering capacitor C elder generation and a metal oxide
Arrester MOA is in parallel, then connects with antiparallel thyristor controlled series compensation T3, T4, the series circuit finally it is in parallel with current-limiting inductance L with
Form LC buffer current-limiting circuit.
In the present invention, IGBT valve group T1, T2 is made of several concatenated IGBT units, and each IGBT unit is equal
IGBT module including two differential concatenations.
In the present invention, in the main branch, each IGBT unit one metal oxide arrester MOA of parallel connection.
In the present invention, in the main branch, the relatively main dc switch of LC buffer current-limiting circuit is located at plant-grid connection side；?
In LC buffer current-limiting circuit, buffering capacitor C antiparallel brilliant lock opposite with the parallel circuit that metal oxide arrester MOA is formed
Pipe T3, T4 are located at plant-grid connection side.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention buffers current limliting circuit using LC, can effectively fault current limiting rise, reduce drop-out current, reduces
MOA energy dissipation accelerates faulty line and cuts off speed.
2, hybrid dc circuit breaker of the invention uses half control type device thyristor, reduces wholly-controled device IGBT number
Amount designs reasonable, at low cost, high reliablity to reduce control difficulty and system cost.
Detailed description of the invention
Fig. 1 is conventional hybrid formula direct-current breaker topology schematic diagram.
Fig. 2 is the hybrid direct-current breaker topology schematic diagram based on LC buffer current-limiting circuit.
Fig. 3 is MMC converter station DC side installing breaker structure schematic diagram.
Fig. 4 is MMC converter station DC bipolar short trouble schematic equivalent circuit.
Fig. 5 is Traditional DC breaker drop-out current process schematic；
Fig. 6 is topological drop-out current process schematic of the invention；
Fig. 7 is conventional topologies MOA energy dissipation schematic diagram；
Fig. 8 is topology MOA energy dissipation schematic diagram of the invention.
Appended drawing reference in figure: 1 quick isolation switch；2 auxiliary dc switch；3 main dc switch；The 4 through-flow branches of auxiliary；5
Main branch.
Specific embodiment
Below in conjunction with attached drawing detailed description of the present invention embodiment.
Hybrid dc circuit breaker of the present invention based on LC buffer current-limiting circuit, by auxiliary branch in parallel and main branch
Road two parts composition, is respectively equipped with auxiliary dc switch and main dc switch；Wherein, auxiliary dc switch is by quick isolation switch
S1 and IGBT valve group T1 is composed in series, and main dc switch is composed in parallel by IGBT valve group T2 and metal oxide arrester MOA.
IGBT valve group T1, T2 is made of several concatenated IGBT units, and each IGBT unit includes two differential concatenations
IGBT module.In the main branch, each IGBT unit one metal oxide arrester MOA of parallel connection.
Series connection is equipped with LC buffer current-limiting circuit, structure in the main branch are as follows: a buffering capacitor C elder generation and a metal oxygen
Compound arrester MOA is in parallel, then connects with antiparallel thyristor controlled series compensation T3, T4, the series circuit finally with current-limiting inductance L simultaneously
Connection is to form LC buffer current-limiting circuit.In the main branch, the relatively main dc switch of LC buffer current-limiting circuit is located at plant-grid connection side；
In LC buffer current-limiting circuit, buffering capacitor C antiparallel crystalline substance opposite with the parallel circuit that metal oxide arrester MOA is formed
Brake tube T3, T4 are located at plant-grid connection side.
Fig. 1 is conventional hybrid formula direct-current breaker topology schematic diagram.When normal work, electric current flows through subsidiary loop, leads back
Electric current is 0 in road.After failure occurs, line current is increased rapidly, and issues action signal to dc circuit breaker.It will lead back first
The IGBT valve group T2 on road is connected, while IGBT valve group T1 being turned off, and the electric current of faulty line is completely transferred to from subsidiary loop
In major loop, and quick isolation switch S1 is disconnected, this process needs about 2ms.
After fault current transfer, metal oxide arrester MOA is put into route by shutdown IGBT valve group T2.MOA
Fundamental characteristics be that when both end voltage is less than voltage rating, external resistance value shows as infinity, and both end voltage is greater than specified electricity
When pressure, electric current is in non-linear increase, and external resistance value is reduced rapidly.Presentation and the reversed voltage of fault current, make after MOA investment
It obtains fault current to be reduced rapidly to 0, dc circuit breaker completion is cut-off.
Fig. 2 is the hybrid direct-current breaker topology schematic diagram based on LC buffer current-limiting circuit.When normal work and tradition
Hybrid dc circuit breaker is identical, and electric current flows through subsidiary loop, main circuit current 0.After failure occurs, line current is rapid
Increase, issues action signal to dc circuit breaker.The IGBT valve group T2 of major loop is connected first, while IGBT valve group T1 being closed
It is disconnected, and quick isolation switch is disconnected, at the same time, thyristor T3, T4 into LC buffering current limliting circuit issue trigger signal.
Fault current is quickly transferred to major loop from subsidiary loop at this time, and thyristor T3 bears forward voltage drop conducting, LC parallel circuit string
Enter fault loop.Since inductive current cannot be mutated, fault current first flows through buffering capacitor, gives buffering capacitor C charging.With electricity
Hold both end voltage to increase, the electric current for flowing through capacitor is gradually reduced, and inductive current is gradually increased.
When the electric current for buffering capacitor C is reduced to 0, positive charge voltage reaches the upper limit, at this time the failure electricity in route
Stream also reaches maximum value.Hereafter buffering capacitor C starts to discharge, and causes thyristor T3 to turn off and thyristor T4 is connected, at this time can be with
The trigger signal of thyristor T3, T4 are removed, the electric current of inductance L continues to increase.Since inductance L seals in the current limliting effect of fault loop
Fruit, so that fault current climbing speed is slack-off.
When main circuit fault current declines to a certain extent, the Continuity signal of IGBT valve group T2 is removed, MOA is put into.
At this time due to the presence of main circuit current, cause MOA that the voltage contrary with fault current is presented, so that major loop failure electricity
Stream constantly falls to 0, and dc circuit breaker completion is cut-off.
After dc circuit breaker completion is cut-off, the electric current in current-limiting inductance L continues the feed-in into buffering capacitor C, so that slow
The voltage reversal for rushing capacitor C increases, and when the electric current of inductance L falls to 0, thyristor T4 is turned off because bearing back-pressure.
By taking fault condition bipolar failure the most serious as an example, the installing mode of actual DC breaker in systems is as schemed
Shown in 3, the equivalent circuit after failure is as shown in figure 4, equivalent circuit can be completed by the parameter designing that LC buffers current limliting circuit accordingly.Root
According to the comparison in Fig. 5,6 figures it can be found that when bipolar short trouble occurs, conventional hybrid formula dc circuit breaker maximum current is
19kA, novel mixed dc circuit breaker maximum current proposed by the present invention are 13kA, reduce about 31.6%, and fault current is cut
The disconnected time drops to 3ms from 5ms, and MOA dissipation energy is reduced to 90kJ from 18MJ known to the comparison in Fig. 7,8 figures.
In general, it is proposed that novel mixed dc circuit breaker due to current-limiting inductance current limitation effect, inhibit
The climbing speed of fault current reduces the practical drop-out current size of breaker and MOA due to buffering the energy storage effect of capacitor
Energy dissipation cut-offs speed to accelerate, and improves the performance of hybrid dc circuit breaker.
Claims (4)
1. a kind of hybrid dc circuit breaker based on LC buffer current-limiting circuit, by auxiliary branch and main branch two parts in parallel
Composition is respectively equipped with auxiliary dc switch and main dc switch；Wherein, auxiliary dc switch is by quick isolation switch S1 and IGBT
Valve group T1 is composed in series, and main dc switch is composed in parallel by IGBT valve group T2 and metal oxide arrester MOA；Its feature exists
In being arranged in series LC buffer current-limiting circuit, structure in the main branch are as follows: a buffering capacitor C first with a metal oxide
Arrester MOA is in parallel, then connects with antiparallel thyristor controlled series compensation T3, T4, the series circuit finally it is in parallel with current-limiting inductance L with
Form LC buffer current-limiting circuit.
2. hybrid dc circuit breaker according to claim 1, which is characterized in that if IGBT valve group T1, T2 be by
Dry concatenated IGBT unit composition, each IGBT unit includes the IGBT module of two differential concatenations.
3. hybrid dc circuit breaker according to claim 2, which is characterized in that in the main branch, each IGBT
Unit one metal oxide arrester MOA of parallel connection.
4. according to claim 1 to hybrid dc circuit breaker described in 3 any one, which is characterized in that in the main branch
The relatively main dc switch of Lu Zhong, LC buffer current-limiting circuit is located at plant-grid connection side；In LC buffer current-limiting circuit, capacitor C is buffered
Antiparallel thyristor T3, T4 opposite with the parallel circuit of metal oxide arrester MOA composition are located at plant-grid connection side.
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| CN201910529757.2A CN110265982A (en) | 2019-06-19 | 2019-06-19 | A kind of hybrid dc circuit breaker based on LC buffer current-limiting circuit |
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| CN201910529757.2A CN110265982A (en) | 2019-06-19 | 2019-06-19 | A kind of hybrid dc circuit breaker based on LC buffer current-limiting circuit |
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Cited By (7)
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|---|---|---|---|---|
| CN111244909A (en) * | 2020-01-17 | 2020-06-05 | 西安交通大学 | Modularized mechanical direct current circuit breaker and switching-on and switching-off method thereof |
| CN112736879A (en) * | 2020-12-18 | 2021-04-30 | 浙江大学 | Direct current fault rapid on-off circuit based on matching of current limiter and circuit breaker |
| CN112865516A (en) * | 2021-02-26 | 2021-05-28 | 华北电力大学 | Active resonance type direct current change-over switch and control method thereof |
| CN114629098A (en) * | 2022-02-23 | 2022-06-14 | 中国科学院电工研究所 | Solid-state switch based on sectional type gapless lightning arrester and utilization rate improving method thereof |
| US20220224100A1 (en) * | 2021-01-12 | 2022-07-14 | Tianjin University | Adaptive fault clearing scheme for mmc vsc-hvdc grid based on source-grid coordination |
| CN114944642A (en) * | 2022-06-09 | 2022-08-26 | 西南交通大学 | Composite energy consumption device based on liquid metal |
| CN116865215A (en) * | 2023-08-30 | 2023-10-10 | 珠海汇众能源科技有限公司 | Parallel circuit breaker circuit |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111244909A (en) * | 2020-01-17 | 2020-06-05 | 西安交通大学 | Modularized mechanical direct current circuit breaker and switching-on and switching-off method thereof |
| CN111244909B (en) * | 2020-01-17 | 2021-08-27 | 西安交通大学 | Modularized mechanical direct current circuit breaker and switching-on and switching-off method thereof |
| CN112736879A (en) * | 2020-12-18 | 2021-04-30 | 浙江大学 | Direct current fault rapid on-off circuit based on matching of current limiter and circuit breaker |
| US20220224100A1 (en) * | 2021-01-12 | 2022-07-14 | Tianjin University | Adaptive fault clearing scheme for mmc vsc-hvdc grid based on source-grid coordination |
| US11444450B2 (en) * | 2021-01-12 | 2022-09-13 | Tianjin University | Adaptive fault clearing scheme for MMC VSC-HVDC grid based on source-grid coordination |
| CN112865516A (en) * | 2021-02-26 | 2021-05-28 | 华北电力大学 | Active resonance type direct current change-over switch and control method thereof |
| CN114629098A (en) * | 2022-02-23 | 2022-06-14 | 中国科学院电工研究所 | Solid-state switch based on sectional type gapless lightning arrester and utilization rate improving method thereof |
| CN114629098B (en) * | 2022-02-23 | 2022-11-11 | 中国科学院电工研究所 | Solid-state switch based on sectional type gapless lightning arrester and utilization rate improving method thereof |
| CN114944642A (en) * | 2022-06-09 | 2022-08-26 | 西南交通大学 | Composite energy consumption device based on liquid metal |
| CN116865215A (en) * | 2023-08-30 | 2023-10-10 | 珠海汇众能源科技有限公司 | Parallel circuit breaker circuit |
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