CN112421589B - Mixed DC breaker with graded turn-off - Google Patents
Mixed DC breaker with graded turn-off Download PDFInfo
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- CN112421589B CN112421589B CN202011385615.2A CN202011385615A CN112421589B CN 112421589 B CN112421589 B CN 112421589B CN 202011385615 A CN202011385615 A CN 202011385615A CN 112421589 B CN112421589 B CN 112421589B
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- 238000000034 method Methods 0.000 claims abstract description 10
- 230000021715 photosynthesis, light harvesting Effects 0.000 claims description 7
- 230000001960 triggered effect Effects 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical class 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 claims 2
- 238000004880 explosion Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
A mixed DC breaker with graded turn-off is composed of current limiting part and turn-off part. The current limiting part consists of two mechanical switches connected in series, two high-capacity power electronic switches connected in series and a current limiter in parallel; the turn-off part is composed of a mechanical switch, three serially connected small-capacity power electronic switches and a lightning arrester in parallel connection. After fault current occurs, the control system sends out an instruction, three mechanical switches are simultaneously opened, and then the power electronic switch in the current limiting part is controlled to be turned on and then turned off, so that current is sequentially transferred from the fracture to the power electronic branch and the current limiter; after the current level is reduced, the power electronic switch in the turn-off part is controlled to be turned on and then turned off, so that the current is sequentially transferred from the fracture to the power electronic branch and the lightning arrester and finally reduced to zero, and the turn-off process is completed. Compared with a five-stage power electronic component cascading mode, the hybrid direct current circuit breaker greatly reduces the cost of the circuit breaker and reduces the current level in the switching-on and switching-off process.
Description
Technical Field
The invention relates to a graded-turn-off hybrid direct-current breaker, which particularly reduces the number of high-capacity power electronic components used in the turn-off process and the current level in the turn-off process by firstly limiting current and then turning off, thereby realizing the function of turning off high current.
Background
The direct current circuit breaker is one of core equipment for guaranteeing safe and reliable operation of the direct current distribution network. The current hybrid current transfer scheme based on high-capacity power electronic component cascade connection has high shutdown capability, but has high cost and higher current level in the shutdown process. Aiming at the defects, the invention provides a mixed direct current breaker scheme with a grading turn-off function, so that the use quantity of high-capacity power electronic components is reduced, the cost is reduced, the current level in the turn-off process is reduced, and the requirements of safety, reliability and economy of the current direct current distribution network can be met.
Disclosure of Invention
In view of the above-mentioned drawbacks or shortcomings of the prior art, the present invention is directed to a novel dc breaker with stepped turn-off. And the current of the system is transferred to the current limiter and the lightning arrester in sequence by controlling the power electronic branch of the current limiting part and the power electronic branch of the switching-off part to act in sequence, so that current breaking is completed.
Specifically, the invention adopts the following technical scheme:
the utility model provides a mixed direct current breaker of hierarchical shutoff, comprises current-limiting part and breaking part, and wherein current-limiting part and breaking part series connection make up, and the circuit both ends are drawn forth through play line end C1 and C2, its characterized in that:
(1) The current limiting part consists of a main branch, a power electronic branch and a current limiting branch which are connected in parallel.
The main branch consists of a high-speed mechanical switch S1 and a high-speed mechanical switch S2 which are connected in series, wherein a left end fracture of the S1 is directly connected with a circuit breaker outlet end C1, and the S1 and the S2 are vacuum or SF 6 High speed mechanical switch.
The power electronic branch is formed by connecting two high-capacity power electronic components in series.
The current limiting branch is a single or multiple series combination of current limiters.
(2) The breaking part consists of a main branch, a power electronic branch and an energy dissipation branch which are connected in parallel.
The main branch consists of a high-speed mechanical switch S3, wherein a fracture at the right end of the S3 is directly connected with a circuit breaker outlet end C2, and S3 is vacuum or SF 6 High speed mechanical switch.
The power electronic branch consists of three small-capacity power electronic components connected in series.
The energy dissipation branches are single or multiple series combinations of metal oxide arresters MOVs.
Under the normal through-flow condition of the system, the high-speed mechanical switches S1, S2 and S3 are closed, and the system current flows through the main branches of the current limiting part and the turn-off part, and at the moment, the power electronic components of the current limiting part and the turn-off part are not triggered.
When the current is turned off, the control system simultaneously sends a brake-off command to the high-speed mechanical switches S1, S2 and S3, and the high-speed mechanical switches S1, S2 and S3 simultaneously act to start arcing. At the same time, the two high-capacity power electronic switches of the current-limiting section are turned on, and the current is transferred from the breaks S1, S2 to the power electronic branch of the current-limiting section.
After the current transfer is completed, the two large-capacity power electronic switches are controlled to be turned off, the current is transferred from the power electronic branch to the current limiting branch, when the current level is reduced to the turn-off capacity of the small-capacity power electronic device in the turn-off part, the three small-capacity power electronic switches in the turn-off part are controlled to be turned on simultaneously, and the current is transferred from the fracture S3 to the three small-capacity power electronic switches.
And after the current is transferred again, controlling to turn off the three small-capacity power electronic switches, and transferring the current from the power electronic branch of the turn-off part to the energy dissipation branch until the current drops to zero, thereby completing the turn-off process.
Drawings
Fig. 1 is a schematic diagram of the circuit topology of the circuit breaker of the present invention.
Fig. 2 is a schematic diagram of the operation of the circuit breaker of the present invention when breaking fault current.
Fig. 3 gives an example of the invention.
Fig. 4 gives an example of the invention.
Fig. 5 gives an example of the invention.
Detailed Description
Specific embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of the circuit topology of the circuit breaker of the present invention, including a main current branch, a power electronic branch, and a current limiting branch of the current limiting portion, and a main current branch, a power electronic branch, and an energy dissipating branch of the shutdown portion.
Fig. 2 shows the current transfer process during the breaking of the fault current of the circuit breaker.
(1) Under the normal through-flow condition of the system shown in fig. 2 (a), the high-speed mechanical switches S1, S2 and S3 are closed, the system current flows in from the outlet terminal C1, flows out from the outlet terminal C2 after passing through the mechanical switches S1, S2 and S3, and at this time, the power electronic components of the current-limiting part and the turn-off part are not triggered.
(2) As shown in fig. 2 (b), after the fault current occurs, the control system simultaneously sends a switching-off command to the high-speed mechanical switches S1, S2, S3, and the high-speed mechanical switches S1, S2, S3 are simultaneously turned on to start arcing.
(3) As shown in fig. 2 (c), when the mechanical switch is turned on in (2), two large-capacity power electronic switches of the current-limiting portion are simultaneously turned on, and under the action of arc voltages of S1, S2 and S3, current is rapidly transferred from the breaks S1, S2 to the power electronic branch of the current-limiting portion.
(4) As shown in fig. 2 (d), after the current transfer is completed, the two large-capacity power electronic switches are controlled to be turned off, and the current is transferred from the power electronic branch to the current-limiting branch, and the current level rapidly starts to decrease.
(5) As shown in fig. 2 (e), when the current level decreases below the off-capacity of the small-capacity power electronic device in the off-section, three small-capacity power electronic switches in the off-section are controlled to be simultaneously turned on, and the current is transferred from the break S3 into the three small-capacity power electronic switches.
(6) As shown in fig. 2 (f), after the current is transferred again, the three small-capacity power electronic switches are turned off, and the current is transferred from the power electronic branch of the off part to the energy dissipation branch until the current drops to zero, so that the turn-off process is completed.
Fig. 3 gives an example of the invention. The implementation of which is described in claim 4.
Fig. 4 shows an example of the present invention. Wherein the power electronic component is additionally provided with a bridge circuit consisting of four diodes D1-4, thereby realizing the function of bidirectional breaking.
Fig. 5 shows an example of the present invention. The power electronic components are connected in series in pairs, so that the bidirectional breaking function is realized.
While the invention has been described in detail with reference to specific preferred embodiments thereof, it should not be construed as limited thereto, but rather as a matter of course, a number of simple deductions or substitutions may be made by those skilled in the art without departing from the spirit of the invention, such as deducting a plurality of stepped turn-off dc breakers with current limiting portions in series to achieve a greater turn-off capability, etc., all shall be construed as falling within the scope of the invention as defined by the appended claims.
Claims (3)
1. The utility model provides a mixed direct current breaker of hierarchical shutoff, comprises current-limiting part and breaking part, and wherein current-limiting part and breaking part are direct to be established ties, draws forth its characterized in that through line terminal C1 and C2:
(1) The current limiting part consists of a main branch, a power electronic branch and a current limiting branch which are connected in parallel;
the main branch consists of a high-speed mechanical switch S1 and a high-speed mechanical switch S2 which are connected in series, wherein a left end fracture of the S1 is directly connected with a circuit breaker outlet end C1, and the S1 and the S2 are vacuum or SF 6 A high-speed mechanical switch;
the power electronic branch is formed by connecting two high-capacity power electronic components in series;
the current limiting branch is a single or a plurality of serial combinations of current limiters;
(2) The breaking part consists of a main branch, a power electronic branch and an energy dissipation branch which are connected in parallel;
the main branch consists of a high-speed mechanical switch S3, S3The right end fracture is directly connected with the outlet end C2 of the circuit breaker, wherein S3 is vacuum or SF 6 A high-speed mechanical switch;
the power electronic branch consists of three small-capacity power electronic components which are connected in series;
the energy dissipation branch is a single or multiple series combination of metal oxide arresters MOVs;
wherein,,
under the condition of normal through flow of the system, the high-speed mechanical switches S1, S2 and S3 are closed, the system current flows through the current limiting part and the main branch of the turn-off part, the system current flows in from the wire outlet end C1, flows out from the wire outlet end C2 after passing through the mechanical switches S1, S2 and S3, and at the moment, the power electronic components of the current limiting part and the turn-off part are not triggered;
when the current is turned off, the control system simultaneously sends a brake-off instruction to the high-speed mechanical switches S1, S2 and S3, and the high-speed mechanical switches S1, S2 and S3 are simultaneously turned on to start arcing; simultaneously, two large-capacity power electronic switches of the current-limiting part are conducted, and under the action of arc voltages of S1, S2 and S3, current is rapidly transferred from the breaks S1 and S2 to a power electronic branch of the current-limiting part;
after the current transfer is completed, the two high-capacity power electronic switches are controlled to be turned off, the current is transferred from the power electronic branch to the current limiting branch, and the current level is rapidly reduced; when the current level is reduced below the turn-off capacity of the small-capacity power electronic device in the turn-off part, three small-capacity power electronic switches in the turn-off part are controlled to be simultaneously turned on, and the current is transferred from the fracture S3 to the three small-capacity power electronic switches;
after the current is transferred again, controlling to turn off three small-capacity power electronic switches, transferring the current from a power electronic branch of a turn-off part to an energy dissipation branch until the current drops to zero, and completing the turn-off process;
the hybrid direct current breaker sequentially transfers the system current to the current limiter and the lightning arrester by controlling the power electronic branch of the current limiting part and the power electronic branch of the turn-off part to sequentially act, so that current breaking is completed.
2. The hybrid dc circuit breaker of claim 1, wherein:
the high-speed mechanical switch is a high-speed mechanical switch based on electromagnetic repulsion force, a mechanical switch based on high-speed motor drive or a high-speed mechanical switch based on explosion drive.
3. The hybrid dc circuit breaker of claim 1, wherein:
(1) The high-capacity power electronic component is formed by connecting a full-control high-power electronic device, an RC branch and a reverse diode in parallel, wherein the power electronic device is single or multiple parallel combinations of an IEGT, an IGCT or an IGBT, the RC branch is single or multiple serial-parallel combinations of a capacitor C and a resistor R, and the reverse diode is single or multiple serial-parallel combinations of a high-power diode D;
(2) The low-capacity power electronic component is formed by connecting a full-control low-power electronic device and an RC branch in parallel, wherein the power electronic device is a single or a plurality of parallel combinations of a low-capacity IGCT or IGBT, the RC branch is a single or a plurality of serial-parallel combinations of a capacitor C and a resistor R, and the reverse diode is a single or a plurality of serial-parallel combinations of a high-power diode D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011385615.2A CN112421589B (en) | 2020-12-01 | 2020-12-01 | Mixed DC breaker with graded turn-off |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011385615.2A CN112421589B (en) | 2020-12-01 | 2020-12-01 | Mixed DC breaker with graded turn-off |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112421589A CN112421589A (en) | 2021-02-26 |
| CN112421589B true CN112421589B (en) | 2023-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011385615.2A Active CN112421589B (en) | 2020-12-01 | 2020-12-01 | Mixed DC breaker with graded turn-off |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5847365B2 (en) * | 2012-10-05 | 2016-01-20 | アーベーベー・テクノロジー・アーゲー | Circuit breaker with stacked breaker module |
| CN103117528B (en) * | 2013-01-17 | 2015-12-02 | 国网智能电网研究院 | One seals in capacitive high voltage DC circuit breaker and control method thereof |
| CN104617573A (en) * | 2015-01-20 | 2015-05-13 | 清华大学 | Natural converting type hybrid high-voltage DC circuit breaker |
| EP3540750B1 (en) * | 2018-03-16 | 2021-05-05 | ABB Power Grids Switzerland AG | Hvdc circuit breaker, hvdc switchyard, hvdc switchyard system, and hvdc grid |
| CN108879620B (en) * | 2018-07-25 | 2024-04-19 | 西安交通大学 | Direct current breaker based on mechanical switch arc voltage transfer and use method thereof |
| CN111640602A (en) * | 2020-05-06 | 2020-09-08 | 许继集团有限公司 | Multi-fracture direct-current switch equipment with controllable transfer branch oscillation current and control method |
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- 2020-12-01 CN CN202011385615.2A patent/CN112421589B/en active Active
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| CN112421589A (en) | 2021-02-26 |
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