CN110048389A - The hybrid DC Line Fault current limiter topology of current commutation H bridge type - Google Patents
The hybrid DC Line Fault current limiter topology of current commutation H bridge type Download PDFInfo
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- CN110048389A CN110048389A CN201910456517.4A CN201910456517A CN110048389A CN 110048389 A CN110048389 A CN 110048389A CN 201910456517 A CN201910456517 A CN 201910456517A CN 110048389 A CN110048389 A CN 110048389A
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- current
- commutation
- branch
- bridge type
- 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 hybrid DC Line Fault current limiter topologys of current commutation H bridge type, belong to multiterminal element, DC grid technical field；Load current is through-flow by low-loss branch when normal operation, and electric current flows through commutation branch realization current limliting process after failure.Commutation branch routing thyristor, commutation capacitor, current-limiting inductance and four groups of H bridge type diodes are formed.Working principle, control model, electrical stress and the engineering design of mentioned current limiter are studied in detail, and carry out simulating, verifying in single-ended converter station and four end DC grids.Studies have shown that mentioned current limiter can effectively inhibit increase in current, and there is good economy.
Description
Technical field
The present invention relates to a kind of hybrid DC Line Fault limits of current commutation H bridge type suitable for multiterminal element and DC grid
Device topology is flowed, multiterminal element, DC grid field are belonged to.
Background technique
With in world wide fossil resource it is increasingly depleted, the development of renewable energy is irresistible, flexible direct current electricity
Net is also with fast development.Flexible DC transmission is the technology of transmission of electricity of new generation based on all-controlling power electronics device, based on soft
Property direct current transportation DC grid, can more preferably realize extensive renewable energy wide area complementation send out, be the following power network development
One of with the important directions of change.China is the significant work of direct current transportation in Zhangbei County's engineering built and black East Germany engineering at present
Journey, following DC grid engineering will develop to the direction of more multiterminal, larger capacity, higher reliability with this as the starting point.
Modular multi-level converter topological structure is suitable for high-power direct current transportation occasion.It is big at a distance in high pressure
In power DC power transmission engineering, overhead line has obvious economy, but its DC side high failure rate, and half-bridge submodule does not have
DC Line Fault Scavenging activity.If short trouble occurs, fault current will rise very rapidly up to more than ten times of rated current, need to be using straight
Breaker quick acting is flowed, isolated fault route cuts off fault current, improves the reliability of system.But with direct current network capacity
The continuous improvement of amount power needs to wait for supper-fast mechanical switch and pulls open enough after a failure in several milliseconds before breaker actuation
Dielectric strength could disjunction main circuit breaker branch, fault current can reach insulated gate bipolar transistor in a shorter time
The limit, so being necessary to adopt fault current limiter before breaker actuation to carry out current limliting.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of hybrid direct current events of current commutation H bridge type
Hinder current limiter 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 flows through commutation branch and sequentially turns on unused branch realization current limliting process.Mentioned current limiter effectively can inhibit electric current to increase
It is long, and there is good economy.
Compared with prior art, the present invention has the advantage that are as follows:
1, restrictor portion uses the H bridge structure of 4 groups of diodes composition, has bidirectional current limiting ability, is suitable for high straightening
Flow field of power transmission；
2, current limiter topology can effectively inhibit DC grid fault current, and the demand to breaker can be greatly reduced；
3, when cooperating direct current ABB formula breaker actuation, occluder configurations can be under the premise of meeting bidirectional current limiting, substantially
Power electronic devices quantity is reduced, economy is good.
Detailed description of the invention
The following further describes the present invention with reference to the drawings.
Fig. 1 is the structural schematic diagram of the hybrid DC Line Fault current limiter topology of current commutation H bridge type, including；
Fig. 2 is the current flowing schematic diagram before breaking down；
Fig. 3 is after breaking down, and fault current flows through the schematic diagram of the T2 branch in commutation branch；
Fig. 4 is the schematic diagram that fault current flows through T3 branch in commutation branch；
Fig. 5 is the schematic diagram that fault current flows through T4 branch in commutation branch.
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.
The hybrid DC Line Fault current limiter topological structure of current commutation H bridge type is as shown in Figure 1, include on-state low-loss branch
Road, current commutation branch and four groups of H bridge type diodes, wherein on-state low-loss branch includes supper-fast mechanical switch and load
Change-over switch, current commutation branch include that three electric currents shift branch.
To meet bidirectional current limiting ability, in current commutation branch two sides four groups of H bridge type diode groups in parallel.Situation if normal
Under, line current is right by left flow direction.After ground fault occurs on the right side of current limiter, fault current passes through two groups of diodes of D1, D4
With commutation branch, fault point is flowed to from left to right.After breaking down on the left of current limiter, fault current passes through two group two of D2, D3
Pole pipe and commutation branch flow to fault point immediately from right to left.
As shown in Fig. 2, system is supplied by on-state low-loss Zhi Luxiang load before breaking down i.e. under normal operating conditions
Electricity.
As shown in figure 3, after breaking down, when line current rises 20% where detecting current limiter, protective device hair
It instructs out, gives LCS module cut-off signals, while triggering T2, Td, and issue separating brake instruction to supper-fast mechanical switch.Failure
Electric current flows through current commutation branch T2, and electric current is transferred quickly in T2.Meanwhile string is flowed through as charge power supply by direct current system
C3 the and Cd branch of connection is capacitor C3 charging.
As shown in figure 4, giving T3 Continuity signal, T3 is connected because bearing positive pressure, and the C3 to have charged on last stage starts to discharge,
Electric current is shifted by T2 branch road direction T3 branch.T2 is turned off because of the back-pressure of a few tens of milliseconds of receiving C3 at this time.Fault current is constantly given
Commutation capacitor charging, until C3 just discharge off.
As shown in figure 5, T4 is connected because bearing forward voltage when fault current continues to capacitor C3 reverse charging, the is realized
Secondary commutation, current limiter movement are completed.Direct current reactor increases, second-order circuit time constant by the investment process of current limiter
It changes, so that fault current be inhibited to rise.Last ABB formula mixed DC breaker actuation, faulty line electric current are reduced to
Zero.
It is illustrated by above-mentioned it is found that the hybrid DC Line Fault current limiter of current commutation H bridge type proposed is in high straightening
Stream field of power transmission has bidirectional current limiting ability, effectively inhibits increase in current and economy is good.
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 hybrid DC Line Fault current limiter topology of current commutation H bridge type suitable for multiterminal element and DC grid,
It is characterized in that: including through-flow branch, current commutation branch；Through-flow branch includes that supper-fast mechanical switch (UFD), load transfer are opened
It closes (LCS), wherein LCS is made of in series and parallel IGBT valve group T1 and diode valve group D；Current commutation branch includes three parts: brilliant
Brake tube valve group T2, thyristor controlled series compensation T3, commutation capacitor C3, derided capacitors Cd series-parallel branch；Thyristor controlled series compensation T4 and current limliting
The discharge paths of reactance L.
2. the hybrid DC Line Fault current limiter topology of current commutation H bridge type according to claim 1, which is characterized in that limit
Stream process is as follows:
Step 1: after breaking down, when line current rises 20% where detecting current limiter, protective device issues instruction,
LCS module cut-off signals are given, while triggering T2, Td, and issue separating brake instruction to supper-fast mechanical switch.Fault current flows through
Current commutation branch T2, electric current are transferred quickly in T2.Meanwhile by direct current system as charge power supply flow through concatenated C3 and
Cd branch is capacitor C3 charging.
Step 2: giving T3 Continuity signal, and T3 is connected because bearing positive pressure, and the C3 to have charged on last stage starts to discharge, electric current by
The transfer of T2 branch road direction T3 branch.T2 is turned off because of the back-pressure of a few tens of milliseconds of receiving C3.Fault current is constantly filled to commutation capacitor
Electricity, until C3 just discharge off.
Step 3: fault current continues to give capacitor C3 reverse charging, and T4 is connected because bearing forward voltage, and realization is changed for the second time
Phase, current limiter movement are completed.As capacitor C3 is constantly increased by 0, when capacitance voltage is equal to system voltage, T3 branch current
Start to reduce, the voltage on smoothing reactor and line inductance becomes negative value, and C3 both end voltage is gradually higher than system voltage.
Step 4: direct current reactor increases by the investment process of current limiter, and second-order circuit time constant changes, thus
Fault current is inhibited to rise.
Step 5: mixed DC breaker actuation, fault current are gradually decrease to zero.
3. the hybrid DC Line Fault current limiter topology of current commutation H bridge type according to claim 1, it is characterised in that: change
Four groups of H bridge type diodes of phase branch two sides parallel connection；If current direction is from left to right when normal operation, failure on the right side of current limiter
When, D1, D4 and the common fault current limiting of commutation branch, on the left of current limiter when failure, D2, D3 and the common current limliting of commutation branch therefore
Hinder electric current.
4. the hybrid DC Line Fault current limiter topology of current commutation H bridge type according to claim 1, it is characterised in that:
When system operates normally, system passes through on-state low-loss branch；When DC line breaks down, current limiter enters current limliting shape
State limits the climbing speed of line current.Final tripping action fault current is reduced to zero.
5. the hybrid DC Line Fault current limiter topology of current commutation H bridge type according to claim 1, it is characterised in that: limit
It is that charged voltage is reversed that stream device topology, which needs C3 capacitor, it is therefore intended that T2 branch is made to bear back-pressure and turn off.Cd is variable capacitance
Device group, its object is to control the charging voltage of commutation capacitor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910456517.4A CN110048389A (en) | 2019-05-29 | 2019-05-29 | The hybrid DC Line Fault current limiter topology of current commutation H bridge type |
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| CN201910456517.4A CN110048389A (en) | 2019-05-29 | 2019-05-29 | The hybrid DC Line Fault current limiter topology of current commutation H bridge type |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111541222A (en) * | 2020-06-05 | 2020-08-14 | 南京工程学院 | High-power tokamak device magnet power supply system quench protection switch |
| CN111917107A (en) * | 2020-07-10 | 2020-11-10 | 华北电力大学 | Capacitive circuit breaker topology suitable for high-voltage direct-current power grid |
| CN112636311A (en) * | 2020-11-12 | 2021-04-09 | 中国南方电网有限责任公司超高压输电公司广州局 | Multi-port current-limiting circuit breaker based on voltage clamping principle and fault removing method |
| CN113036737A (en) * | 2021-03-25 | 2021-06-25 | 福州大学 | Flexible current limiter capable of being connected in series on direct current circuit and control method thereof |
| CN113394760A (en) * | 2021-06-15 | 2021-09-14 | 南京工程学院 | Current pre-limiting type high-voltage direct current fault current limiter based on capacitance commutation and method |
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| CN108123427A (en) * | 2018-01-17 | 2018-06-05 | 华北电力大学 | A kind of inductive type bidirectional, dc current limiter topology |
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2019
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| CN108123427A (en) * | 2018-01-17 | 2018-06-05 | 华北电力大学 | A kind of inductive type bidirectional, dc current limiter topology |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111541222A (en) * | 2020-06-05 | 2020-08-14 | 南京工程学院 | High-power tokamak device magnet power supply system quench protection switch |
| CN111917107A (en) * | 2020-07-10 | 2020-11-10 | 华北电力大学 | Capacitive circuit breaker topology suitable for high-voltage direct-current power grid |
| CN112636311A (en) * | 2020-11-12 | 2021-04-09 | 中国南方电网有限责任公司超高压输电公司广州局 | Multi-port current-limiting circuit breaker based on voltage clamping principle and fault removing method |
| CN112636311B (en) * | 2020-11-12 | 2021-11-12 | 中国南方电网有限责任公司超高压输电公司广州局 | Multi-port current-limiting circuit breaker based on voltage clamping principle and fault removing method |
| CN113036737A (en) * | 2021-03-25 | 2021-06-25 | 福州大学 | Flexible current limiter capable of being connected in series on direct current circuit and control method thereof |
| CN113394760A (en) * | 2021-06-15 | 2021-09-14 | 南京工程学院 | Current pre-limiting type high-voltage direct current fault current limiter based on capacitance commutation and method |
| CN113394760B (en) * | 2021-06-15 | 2022-08-16 | 南京工程学院 | Current pre-limiting type high-voltage direct current fault current limiter based on capacitance commutation and method |
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