CN112421589A - Hybrid direct current breaker with graded turn-off - Google Patents
Hybrid direct current breaker with graded turn-off Download PDFInfo
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- CN112421589A CN112421589A CN202011385615.2A CN202011385615A CN112421589A CN 112421589 A CN112421589 A CN 112421589A CN 202011385615 A CN202011385615 A CN 202011385615A CN 112421589 A CN112421589 A CN 112421589A
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- current
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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]
Abstract
A mixed DC breaker with graded turn-off is composed of current-limiting part and turn-off part. The current limiting part is formed by connecting two mechanical switches in series, two large-capacity power electronic switches in series and a current limiter in parallel; the turn-off part is composed of a mechanical switch, three series-connected small-capacity power electronic switches and a lightning arrester in parallel connection. After the fault current occurs, the control system sends out an instruction, the three mechanical switches are opened simultaneously, and then the power electronic switches in the current limiting part are controlled to be switched on and then switched off, so that the current is transferred to the power electronic branch and the current limiter from the fracture in sequence; and after the current level is reduced, controlling the power electronic switch in the turn-off part to be turned on and then turned off, so that the current is sequentially transferred to the power electronic branch and the lightning arrester from the break and finally drops to zero, and completing the turn-off process. Compared with a five-level power electronic component cascade mode, the hybrid direct current circuit breaker greatly reduces the cost of the circuit breaker and reduces the current level in the on-off process.
Description
Technical Field
The invention relates to a mixed direct current breaker with graded turn-off, which particularly reduces the number of large-capacity power electronic components used in the turn-off process and reduces the current level in the turn-off process by firstly limiting current and then turning off, thereby realizing the function of turning off large current.
Background
The direct current circuit breaker is one of core equipment for ensuring safe and reliable operation of a direct current power distribution network. At present, although the shutdown capability is strong, the cost is high, and the current level is high in the shutdown process. Aiming at the defects, the invention provides a mixed type direct current breaker scheme with a graded turn-off function, so that the using quantity of high-capacity power electronic components is reduced, the cost is reduced, the current level in the turn-on and turn-off process is reduced, and the requirements of safety, reliability and economy of the conventional direct current distribution network can be met.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, an object of the present invention is to provide a novel dc circuit breaker with step-off. The power electronic branches of the current limiting part and the turn-off part are controlled to act sequentially, so that the system current is transferred to the current limiter and the lightning arrester sequentially, and the 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 disjunction part, and wherein current-limiting part and disjunction part series combination, the circuit both ends are drawn forth through leading-out terminal C1 and C2, its characterized in that:
(1) the current limiting part is formed by connecting a main branch, a power electronic branch and a current limiting branch in parallel.
The main branch is composed of a high-speed mechanical switch S1 and a high-speed mechanical switch S2 which are connected in series, a fracture at the left end of S1 is directly connected with a breaker outlet terminal C1, wherein S1 and S2 are vacuum or SF6High speed mechanical switches.
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 series combinations of current limiters.
(2) The breaking part is formed by connecting a main branch, a power electronic branch and an energy dissipation branch in parallel.
The main branch is composed of a high-speed mechanical switch S3, a right-end fracture of S3 is directly connected with a breaker outlet terminal C2, wherein S3 is vacuum or SF6High speed mechanical switches.
The power electronic branch circuit is formed by connecting three small-capacity power electronic components in series.
The energy dissipation branch is a single or a plurality of series combinations of metal oxide arresters MOV.
Under normal system current flowing conditions, the high-speed mechanical switches S1, S2 and S3 are closed, and system current flows through the main branch of the current limiting part and the turn-off part, and 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 brake opening commands to the high-speed mechanical switches S1, S2 and S3, and the high-speed mechanical switches S1, S2 and S3 simultaneously operate to start arcing. At the same time, two large-capacity power electronic switches of the current limiting part are conducted, and current is transferred from the fractures S1 and S2 to a power electronic branch of the current limiting part.
After the current transfer is finished, controlling and turning off the two high-capacity power electronic switches, transferring the current from the power electronic branches to the current-limiting branch, controlling the three low-capacity power electronic switches in the turning-off part to be simultaneously turned on when the current level is reduced to the turning-off capacity of the low-capacity power electronic devices in the turning-off part, and transferring the current from the fracture S3 to the three low-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 to the energy dissipation branch from the off part until the current is reduced to zero to finish the on-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 the fault current.
Figure 3 shows an example of the invention.
Figure 4 gives an example of the invention.
Figure 5 shows an example of the invention.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
Fig. 1 is a schematic diagram of a circuit topology of a circuit breaker according to the present invention, including a main current branch, a power electronic branch, and a current limiting branch of a current limiting portion, and a main current branch, a power electronic branch, and an energy dissipating branch of a turn-off portion.
Fig. 2 shows the current transfer process during the fault current breaking process of the circuit breaker.
(1) Under normal current flowing condition of the system as 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, and 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), when the fault current occurs, the control system simultaneously issues opening commands to the high-speed mechanical switches S1, S2, and S3, and the high-speed mechanical switches S1, S2, and S3 are simultaneously opened to start arcing.
(3) As shown in fig. 2(c), when the mechanical switch is turned on in (2), the two large-capacity power electronic switches of the current limiting portion are turned on simultaneously, and the current is rapidly transferred from the fractures S1, S2 to the power electronic branches of the current limiting portion under the action of the arc voltage of S1, S2 and S3.
(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, the current is transferred from the power electronic branch to the current-limiting branch, and the current level starts to decrease rapidly.
(5) When the current level drops below the turn-off capacity of the small-capacity power electronic devices in the turn-off section, as shown in fig. 2(e), the three small-capacity power electronic switches in the turn-off section are controlled to be simultaneously opened, and the current is transferred from the break S3 to 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 to the energy dissipation branch until the current drops to zero, thereby completing the switching-on and switching-off process.
An example of the invention is given in figure 3. Wherein the power electronics assembly is implemented as claimed in claim 4.
Fig. 4 shows an example of the present invention. The power electronic component is additionally provided with a bridge circuit consisting of four diodes D1-4, so that the function of bidirectional breaking is realized.
Fig. 5 shows an example of the present invention. The power electronic components are connected in series in an anti-reverse mode in pairs, and the function of bidirectional breaking is achieved.
The above is a further detailed description of the present invention with reference to specific preferred embodiments, and it should not be considered that the specific embodiments of the present invention are limited thereto, and it will be apparent to those skilled in the art that several simple deductions or substitutions, for example, deducing a step-off dc circuit breaker with a plurality of current limiting parts connected in series to achieve a larger turn-off capability, etc., may be made without departing from the spirit of the present invention, and all should be considered as belonging to the protection scope of the present invention as determined by the appended claims.
Claims (4)
1. The utility model provides a mixed direct current breaker of hierarchical shutoff, comprises current-limiting part and disjunction part, and wherein current-limiting part and disjunction part are directly established ties, draw forth through leading-out terminal C1 and C2, its characterized in that:
(1) the current limiting part is formed by connecting a main branch, a power electronic branch and a current limiting branch in parallel.
The main branch is composed of a high-speed mechanical switch S1 and a high-speed mechanical switch S2 which are connected in series, a fracture at the left end of S1 is directly connected with a breaker outlet terminal C1, wherein S1 and S2 are vacuum or SF6High speed mechanical switches.
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 series combinations of current limiters.
(2) The breaking part is formed by connecting a main branch, a power electronic branch and an energy dissipation branch in parallel.
The main branch is composed of a high-speed mechanical switch S3, a right-end fracture of S3 is directly connected with a breaker outlet terminal C2, wherein S3 is vacuum or SF6High speed mechanical switches.
The power electronic branch circuit is formed by connecting three small-capacity power electronic components in series.
The energy dissipation branch is a single or a plurality of series combinations of metal oxide arresters MOV.
2. The circuit breaker of claim 1, wherein:
under normal current flowing conditions of the system, the high-speed mechanical switches S1, S2 and S3 are closed, system current flows through the current limiting part and the main branch of the turn-off part, and 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 brake opening commands to the high-speed mechanical switches S1, S2 and S3, and the high-speed mechanical switches S1, S2 and S3 simultaneously operate to start arcing. At the same time, two large-capacity power electronic switches of the current limiting part are conducted, and current is transferred from the fractures S1 and S2 to a power electronic branch of the current limiting part.
After the current transfer is finished, controlling and turning off the two high-capacity power electronic switches, transferring the current from the power electronic branches to the current-limiting branch, controlling the three low-capacity power electronic switches in the turning-off part to be simultaneously turned on when the current level is reduced to the turning-off capacity of the low-capacity power electronic devices in the turning-off part, and transferring the current from the fracture S3 to the three low-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 to the energy dissipation branch from the off part until the current is reduced to zero to finish the on-off process.
3. The circuit breaker of claim 1, wherein:
the high-speed mechanical switch is a high-speed mechanical switch based on electromagnetic repulsion, a mechanical switch based on high-speed motor drive or a high-speed mechanical switch based on explosion drive.
4. The circuit breaker of claim 1, wherein:
(1) the high-capacity power electronic component is formed by connecting a fully-controlled high-power electronic device, an RC branch circuit and a reverse diode in parallel, wherein the power electronic device can be a single or multiple parallel combination of an IEGT, an IGCT or an IGBT, the RC branch circuit is a single or multiple series-parallel combination of a capacitor C and a resistor R, and the reverse diode is a single or multiple series combination of a high-power diode D.
(2) The small-capacity power electronic component is formed by connecting a full-control small-power electronic device and an RC (resistor-capacitor) branch in parallel, wherein the power electronic device can be a single or multiple parallel combination of a small-capacity IGCT (insulated gate bipolar transistor) or an IGBT (insulated gate bipolar transistor), the RC branch is a single or multiple series-parallel combination of a capacitor C and a resistor R, and the reverse diode is a single or multiple series combination 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 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011385615.2A CN112421589B (en) | 2020-12-01 | 2020-12-01 | Mixed DC breaker with graded turn-off |
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| Publication Number | Publication Date |
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| CN112421589A true CN112421589A (en) | 2021-02-26 |
| CN112421589B CN112421589B (en) | 2023-08-01 |
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| CN202011385615.2A Active CN112421589B (en) | 2020-12-01 | 2020-12-01 | Mixed DC breaker with graded turn-off |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117528A (en) * | 2013-01-17 | 2013-05-22 | 国网智能电网研究院 | Series capacitor type high-voltage direct current 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 |
| CN104685597A (en) * | 2012-10-05 | 2015-06-03 | Abb技术有限公司 | Circuit breaker with stacked breaker modules |
| CN108879620A (en) * | 2018-07-25 | 2018-11-23 | 西安交通大学 | Dc circuit breaker and its application method based on the transfer of mechanical switch arc voltage |
| EP3540750A1 (en) * | 2018-03-16 | 2019-09-18 | ABB Schweiz AG | Hvdc circuit breaker, hvdc switchyard, hvdc switchyard system, and hvdc grid |
| 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 |
-
2020
- 2020-12-01 CN CN202011385615.2A patent/CN112421589B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104685597A (en) * | 2012-10-05 | 2015-06-03 | Abb技术有限公司 | Circuit breaker with stacked breaker modules |
| CN103117528A (en) * | 2013-01-17 | 2013-05-22 | 国网智能电网研究院 | Series capacitor type high-voltage direct current 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 |
| EP3540750A1 (en) * | 2018-03-16 | 2019-09-18 | ABB Schweiz AG | Hvdc circuit breaker, hvdc switchyard, hvdc switchyard system, and hvdc grid |
| CN108879620A (en) * | 2018-07-25 | 2018-11-23 | 西安交通大学 | Dc circuit breaker and its application method based on the transfer of mechanical switch arc voltage |
| 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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| CN112421589B (en) | 2023-08-01 |
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