CN109217239B - Direct current breaker with breaking selection function - Google Patents
Direct current breaker with breaking selection function Download PDFInfo
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- CN109217239B CN109217239B CN201811187976.9A CN201811187976A CN109217239B CN 109217239 B CN109217239 B CN 109217239B CN 201811187976 A CN201811187976 A CN 201811187976A CN 109217239 B CN109217239 B CN 109217239B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/541—Contacts shunted by semiconductor devices
- H01H9/542—Contacts shunted by static switch means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/548—Electromechanical and static switch connected in series
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Abstract
The invention discloses a direct current breaker with a breaking function, which comprises a main breaking branch, a plurality of breaking branches and an energy absorption branch; the input end of the main breaking branch is connected with the output end of the direct current bus; the output ends of the main breaking branches are respectively connected with the input ends of the plurality of breaking branches; the input ends of the plurality of breaking branches are used for being connected with a plurality of leading-out ends of the direct current bus in a one-to-one correspondence manner, and the output ends of the plurality of breaking branches are connected with the output ends of the plurality of breaking branches in a one-to-one correspondence manner; the input end of the energy-absorbing branch is connected with the input end of the main breaking branch, and the output end of the energy-absorbing branch is connected with the output end of the main breaking branch. This direct current breaker does not have the generating line ground connection condition at the separating brake in-process, need not to carry out the protection of shutting bus and can provide the current transfer branch road for the fault line when the circuit breaks down, reduces the loss of electric energy, realizes that the circuit switches on fast, shortens direct current breaker break-off fault current's total time.
Description
Technical Field
The invention relates to the field of circuit breakers, in particular to a direct-current circuit breaker with a breaking selection function.
Background
In recent years, with the continuous development of new energy technology in China, a new energy power generation mode mainly based on wind power generation is greatly popularized. However, the existing power grid in China is limited by the technology of the power grid, large-scale new energy is difficult to be consumed, and the phenomena of 'wind abandoning and light abandoning' are severe. The high-voltage direct current transmission HVDC technology based on the voltage source type converter has the advantages of consuming large-scale new energy, supplying power to passive areas and being easy to network, and is beneficial to improving the capacity of the existing power grid for consuming the new energy. In the VSC-HVDC converter topological structures, the modular multilevel converter MMC has the advantages of small switching loss, good expansibility and low harmonic level, and is more suitable for future direct-current power grids. The modular multilevel converter MMC cannot limit fault current at a direct current side through self control, and the current needs to be quickly cleared by means of a direct current breaker. The direct current breaker has the functions of changing the system operation mode when the system normally operates and rapidly cutting off fault current when the system fails, and plays an important role in the development of a direct current power grid.
The traditional high-voltage direct-current circuit breaker has various types, wherein the hybrid direct-current circuit breaker has the advantages of small on-state loss and high cutting speed during fault operation in normal operation, and is a research hotspot of the traditional direct-current circuit breaker. However, the hybrid dc breaker branch circuit requires a large number of power electronic devices, and the construction cost is too high and the economical efficiency is poor when the hybrid dc breaker branch circuit is applied to a multi-line dc power grid. Although the prior technical scheme uses a main breaking part consisting of a large number of Insulated Gate Bipolar Transistors (IGBT) connected in series and in parallel on each bus of a direct current system, the economic efficiency is good. However, when the combined dc circuit breaker is applied to a flexible dc power transmission system in which current-limiting reactors are mixed, a bus grounding process occurs during the operation of the combined dc circuit breaker after a system fault, and the current-limiting function of the line current-limiting reactor cannot be fully exerted, and at the same time, bus protection needs to be locked.
Disclosure of Invention
The invention aims to provide a direct current breaker with a selective breaking function, so that the breaker does not have the bus grounding condition in the opening process, does not need to carry out bus locking protection, can provide a current transfer branch circuit for a fault line when the line has a fault, reduces the loss of electric energy, realizes the rapid conduction of the line, and shortens the total time of the direct current breaker for breaking the fault current.
The embodiment of the invention provides a direct current breaker with a breaking function, which comprises a main breaking branch, a plurality of breaking branches and an energy absorption branch; the input end of the main breaking branch is used for being connected with the output end of the direct current bus; the output end of the main breaking branch is respectively connected with the input ends of the plurality of selective breaking branches; the input ends of the breaking branches are used for being connected with the line outgoing ends of the direct current bus in a one-to-one correspondence mode, and the output ends of the breaking branches are connected with the output ends of the breaking branches in a one-to-one correspondence mode; the input end of the energy-absorbing branch is connected with the input end of the main breaking branch, and the output end of the energy-absorbing branch is connected with the output end of the main breaking branch; the main breaking branch comprises a bridge type sub-module circuit, the input end of the bridge type sub-module circuit is connected with the input end of the main breaking branch, and the output end of the bridge type sub-module circuit is connected with the output end of the main breaking branch; the breaking branch comprises a quick mechanical switch and a current transfer switch; the input end of the rapid mechanical switch is connected with the input end of the breaking branch, the output end of the rapid mechanical switch is connected with the input end of the current transfer switch, and the output end of the current transfer switch is connected with the output end of the breaking branch; the selective breaking branch comprises an isolating switch and a thyristor circuit, the input end of the isolating switch is connected with the input end of the selective breaking branch, the output end of the isolating switch is connected with the input end of the thyristor circuit, and the output end of the thyristor circuit is connected with the output end of the selective breaking branch.
Preferably, the bridge submodule circuit comprises a plurality of bridge submodule strings; the input end of any one bridge type submodule string is connected with the input end of the bridge type submodule circuit; the output end of any one bridge type submodule string is connected with the output end of the bridge type submodule circuit; and the single bridge submodule string is formed by connecting Q bridge submodules in series.
Preferably, the bridge submodule includes the first pole tube, the second diode, the third pole tube, the fourth pole tube and the insulated gate bipolar transistor, a negative electrode of the first pole tube is connected with a positive electrode of the second diode, a negative electrode of the second diode is connected with a collector electrode of the insulated gate bipolar transistor, a positive electrode of the first pole tube is connected with an emitter electrode of the insulated gate bipolar transistor, a positive electrode of the third pole tube is connected with a negative electrode of the fourth pole tube, a negative electrode of the third pole tube is connected with a collector electrode of the insulated gate bipolar transistor, and a positive electrode of the fourth pole tube is connected with an emitter electrode of the insulated gate bipolar transistor.
Preferably, the current transfer switch comprises a plurality of strings of insulated gate bipolar transistors; the input end of any one insulated gate bipolar transistor string is connected with the input end of the current transfer switch, and the output end of any one insulated gate bipolar transistor string is connected with the output end of the current transfer switch; and the single insulated gate bipolar transistor string is formed by connecting i insulated gate bipolar transistors in series.
Preferably, the thyristor circuit comprises a plurality of thyristor strings; the input end of any one thyristor string is connected with the input end of the thyristor circuit, and the output end of any one thyristor string is connected with the output end of the thyristor circuit; and the single thyristor string consists of M thyristors which are connected in series.
Preferably, the energy absorption branch comprises a metal oxide arrester.
Compared with the prior art, the direct current breaker with the breaking selection function provided by the embodiment of the invention has the beneficial effects that: the direct current breaker with the breaking function comprises a main breaking branch, a plurality of breaking branches and an energy absorption branch; the input end of the main breaking branch is used for being connected with the output end of the direct current bus; the output end of the main breaking branch is respectively connected with the input ends of the plurality of selective breaking branches; the input ends of the breaking branches are used for being connected with the line outgoing ends of the direct current bus in a one-to-one correspondence mode, and the output ends of the breaking branches are connected with the output ends of the breaking branches in a one-to-one correspondence mode; the input end of the energy-absorbing branch is connected with the input end of the main breaking branch, and the output end of the energy-absorbing branch is connected with the output end of the main breaking branch; the main breaking branch comprises a bridge type sub-module circuit, the input end of the bridge type sub-module circuit is connected with the input end of the main breaking branch, and the output end of the bridge type sub-module circuit is connected with the output end of the main breaking branch; the breaking branch comprises a quick mechanical switch and a current transfer switch; the input end of the rapid mechanical switch is connected with the input end of the breaking branch, the output end of the rapid mechanical switch is connected with the input end of the current transfer switch, and the output end of the current transfer switch is connected with the output end of the breaking branch; the selective breaking branch comprises an isolating switch and a thyristor circuit, the input end of the isolating switch is connected with the input end of the selective breaking branch, the output end of the isolating switch is connected with the input end of the thyristor circuit, and the output end of the thyristor circuit is connected with the output end of the selective breaking branch. The mode through several branch road combinations makes the circuit breaker not have the bus grounding condition at the separating brake in-process, need not to block bus protection and through setting up the selection branch road, when the circuit broke down, can effectively switch on this branch road and provide the current transfer branch road for the fault line, reduces the loss of electric energy, realizes that the circuit switches on fast, shortens direct current circuit breaker break fault current's total time.
Drawings
Fig. 1 is a schematic structural diagram of a dc circuit breaker with a breaking function according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a bridge-type sub-module in a main breaking branch of a dc circuit breaker with a breaking selection function according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a breaking branch of a dc circuit breaker with a breaking function according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Please refer to fig. 1, which is a schematic structural diagram of a dc circuit breaker with a breaking function according to an embodiment of the present invention, where the dc circuit breaker with a breaking function includes a main breaking branch, a plurality of breaking branches, and an energy absorbing branch; the input end of the main breaking branch is used for being connected with the output end of the direct current bus; the output end of the main breaking branch is respectively connected with the input ends of the plurality of selective breaking branches; the input ends of the breaking branches are used for being connected with the line outgoing ends of the direct current bus in a one-to-one correspondence mode, and the output ends of the breaking branches are connected with the output ends of the breaking branches in a one-to-one correspondence mode; the input end of the energy-absorbing branch is connected with the input end of the main breaking branch, and the output end of the energy-absorbing branch is connected with the output end of the main breaking branch; the main breaking branch comprises a bridge type sub-module circuit, the input end of the bridge type sub-module circuit is connected with the input end of the main breaking branch, and the output end of the bridge type sub-module circuit is connected with the output end of the main breaking branch; the breaking branch comprises a quick mechanical switch 21 and a current transfer switch 22; the input end of the rapid mechanical switch 21 is connected with the input end of the breaking branch, the output end of the rapid mechanical switch 21 is connected with the input end of the current transfer switch 22, and the output end of the current transfer switch 22 is connected with the output end of the breaking branch; the selective breaking branch comprises an isolating switch and a thyristor circuit, the input end of the isolating switch is connected with the input end of the selective breaking branch, the output end of the isolating switch is connected with the input end of the thyristor circuit, and the output end of the thyristor circuit is connected with the output end of the selective breaking branch.
In this embodiment, the main breaking branch is only composed of a large number of full-bridge submodules, so that the cost of the breaker applied to a multi-line direct-current power grid is reduced, a transfer branch is provided for fault current, and the fault current breaking branch has the capacity of breaking the fault current; when any part of the direct current circuit is short-circuited, the breaker has no bus grounding condition in the opening process, the direct current bus is not required to be locked and protected, and the internal capacitor of the converter of the direct current bus is not required to be discharged to the ground through the bus current limiting reactor, so that the current limiting function of the current limiting reactor on the circuit is fully exerted. Meanwhile, by arranging the selective breaking branch, when a fault occurs in the line, the branch can be effectively conducted to provide a current transfer branch for the fault line, the loss of electric energy is reduced, the line is quickly conducted, and the total time of the direct current breaker for breaking the fault current is shortened.
Preferably, when the dc circuit breaker is in normal operation, the disconnecting switch in the selective breaking branch keeps a closed state, and when the protection determines that a fault occurs on a specific line, the thyristor in the selective breaking branch of the corresponding line is turned on, so as to provide a fault current transfer branch for the fault line.
In an alternative embodiment, the bridge submodule circuit comprises a plurality of bridge submodule strings; the input end of any one bridge type submodule string is connected with the input end of the bridge type submodule circuit; the output end of any one bridge type submodule string is connected with the output end of the bridge type submodule circuit; and the single bridge submodule string is formed by connecting Q bridge submodules in series.
In this embodiment, since the bridge sub-module circuit includes a plurality of bridge sub-module strings, the capability of the main breaking branch to cut off the fault current is improved; the single bridge sub-module string is formed by connecting Q bridge sub-modules in series, and the main purpose is to improve the overvoltage resistance of the main breaking branch; and the DC circuit breaker has good expansibility by adopting a modular design.
The bridge submodule circuit can be set to comprise P bridge submodule strings, and the value of P is required to ensure that the main breaking branch can cut off the maximum fault current generated by the system when a line fails; the value of Q is to ensure that the main broken branch can withstand the maximum transient overvoltage of the system without breakdown when the main broken branch operates normally and the line fails. According to the requirement of the applied voltage class, the bridge submodules in the corresponding number in series-parallel connection meet the requirement of a direct-current system, and can be well and flexibly applied to a direct-current power grid.
Please refer to fig. 2, which is a schematic structural diagram of a bridge-type sub-module in a main breaking branch of a dc circuit breaker with a breaking function according to an embodiment of the present invention, the bridge submodule comprises the first pole tube 11, the second diode 12, the third pole tube 13, the fourth pole tube 14 and the insulated gate bipolar transistor 15, the cathode of the first diode 11 is connected to the anode of the second diode 12, the cathode of the second diode 12 is connected to the collector of the igbt 15, the anode of the first diode 11 is connected to the emitter of the igbt 15, the anode of the third transistor 13 is connected to the cathode of the fourth diode 14, the cathode of the third transistor 13 is connected to the collector of the igbt 15, the anode of the fourth diode 14 is connected to the emitter of the insulated gate bipolar transistor 15.
Please refer to fig. 3, which is a schematic diagram of a breaking branch structure of a dc circuit breaker with a breaking function according to an embodiment of the present invention, where the breaking branch includes a fast mechanical switch 21 and a current transfer switch 22; the current transfer switch comprises a plurality of insulated gate bipolar transistor strings; the input end of any one insulated gate bipolar transistor string is connected with the input end of the current transfer switch, and the output end of any one insulated gate bipolar transistor string is connected with the output end of the current transfer switch; and the single insulated gate bipolar transistor string is formed by connecting i insulated gate bipolar transistors in series.
In this embodiment, when the line normally operates, a current flows through the breaking branch, the voltage that the current transfer switch 22 needs to bear is small, and the operation loss of the device is small; when a line fault occurs, the current transfer switch 22 is opened to transfer fault current to the main breaking branch, so that arc-free turning-off of the quick mechanical switch 21 is realized.
The current transfer switch can be set to comprise j insulated gate bipolar transistor strings, and in order to ensure that the current transfer switch has sufficient redundancy, the value of j is determined by the specified redundancy requirement and the maximum fault current required to be disconnected by the current transfer switch; the value of i is determined by the redundancy requirements specified and the maximum voltage that the current transfer switch needs to withstand.
Preferably, the fast mechanical switch 21 is a millisecond fast mechanical switch, so that the direct current circuit breaker can cut off current in millisecond time, and fault expansion is effectively avoided.
In an alternative embodiment, the thyristor circuit comprises several thyristor strings; the input end of any one thyristor string is connected with the input end of the thyristor circuit, and the output end of any one thyristor string is connected with the output end of the thyristor circuit; and the single thyristor string consists of M thyristors which are connected in series.
In this embodiment, since the thyristor circuit includes a plurality of thyristor strings, the current flowing capability of the selected branch circuit is improved; and the single thyristor string is formed by connecting M thyristors in series, and the capacity of the selective breaking branch for resisting overvoltage is mainly improved.
The thyristor circuit can be set to comprise N thyristor strings, and the value of N is required to ensure that the selected breaking branch can pass through the maximum fault current and is not broken down when a line fails; the value of M is to ensure that the selected branch can withstand the maximum transient overvoltage of the system without breakdown when the selected branch operates normally and the line fails.
Preferably, the selective breaking branch circuit adopts a cheaper thyristor power electronic device, so that the cost of the circuit breaker can be saved, the circuit can be quickly conducted, and the total time of breaking the fault current of the direct current circuit breaker is shortened.
In an alternative embodiment, the energy absorbing branch comprises a metal oxide arrester for absorbing residual energy on the line inductance and the line current limiting reactor after the dc breaker is opened.
The working principle of the direct current breaker with the breaking selection function is as follows:
closing in normal working: when the direct current breaker normally operates, the full-bridge submodule of the main breaking branch and the thyristor string of the selective breaking branch are disconnected, and current flows through the breaking branch to realize power transmission. When the system is switched on during normal operation, the thyristor string of the selected branch corresponding to the main broken branch and the line required to be switched on is switched on in a leading mode, then the quick mechanical switch 21 on the corresponding line is closed, then the current transfer switch 22 is switched on in a zero voltage difference state, finally the insulated gate bipolar transistor 15 of the full-bridge submodule in the main broken branch is switched off, and when the current is reduced to a certain level, the thyristor string of the selected broken branch is naturally switched off, so that the switching on of the direct current breaker is completed.
Opening the brake in normal working: when the direct current breaker normally operates, the opening function of the direct current breaker is needed to be utilized when the interior of the direct current breaker needs to be checked and maintained or the operation mode of a system needs to be changed. When the system is in normal operation, switching-off is carried out, the thyristor string of the selected branch corresponding to the main broken branch and the line needing to be switched on is switched on in a leading mode, then the current transfer switch 22 is switched off, then the rapid mechanical switch 21 on the line needing to be switched off is switched off in an arc-free mode, finally the insulated gate bipolar transistor 15 of the full-bridge submodule in the main broken branch is switched off, the current is decreased to a certain level, the thyristor string of the selected broken branch is naturally switched off, and switching-off of the direct current circuit breaker is completed.
And (3) switching off when a short-circuit fault occurs to the line: when the short-circuit fault happens to the line, the line current rises sharply, the voltage of the direct-current bus gradually drops, after the fault line is judged in a protection mode, the thyristor string of the selected branch corresponding to the fault line and the insulated gate bipolar transistor 15 of the full-bridge submodule in the main broken branch are conducted simultaneously, a transfer branch is provided for the fault current, then the current transfer switch 22 is disconnected under the condition of zero voltage difference, then the quick mechanical switch 21 is enabled to be disconnected without arc within 2ms, and finally the insulated gate bipolar transistor 15 of the full-bridge submodule in the main broken branch is disconnected, and after that, the residual energy in the line inductor and the line current limiting reactor can be absorbed by the lightning arrester of the energy absorption branch, and the fault current is completely removed.
Compared with the prior art, the direct current breaker with the breaking selection function provided by the embodiment of the invention has the beneficial effects that: the direct current breaker with the breaking function comprises a main breaking branch, a plurality of breaking branches and an energy absorption branch; the input end of the main breaking branch is used for being connected with the output end of the direct current bus; the output end of the main breaking branch is respectively connected with the input ends of the plurality of selective breaking branches; the input ends of the breaking branches are used for being connected with the line outgoing ends of the direct current bus in a one-to-one correspondence mode, and the output ends of the breaking branches are connected with the output ends of the breaking branches in a one-to-one correspondence mode; the input end of the energy-absorbing branch is connected with the input end of the main breaking branch, and the output end of the energy-absorbing branch is connected with the output end of the main breaking branch; the main breaking branch comprises a bridge type sub-module circuit, the input end of the bridge type sub-module circuit is connected with the input end of the main breaking branch, and the output end of the bridge type sub-module circuit is connected with the output end of the main breaking branch; the breaking branch comprises a quick mechanical switch and a current transfer switch; the input end of the rapid mechanical switch is connected with the input end of the breaking branch, the output end of the rapid mechanical switch is connected with the input end of the current transfer switch, and the output end of the current transfer switch is connected with the output end of the breaking branch; the selective breaking branch comprises an isolating switch and a thyristor circuit, the input end of the isolating switch is connected with the input end of the selective breaking branch, the output end of the isolating switch is connected with the input end of the thyristor circuit, and the output end of the thyristor circuit is connected with the output end of the selective breaking branch. The mode through several branch road combinations makes the circuit breaker not have the bus grounding condition at the separating brake in-process, need not to block bus protection and through setting up the selection branch road, when the circuit broke down, can effectively switch on this branch road and provide the current transfer branch road for the fault line, reduces the loss of electric energy, realizes that the circuit switches on fast, shortens direct current circuit breaker break fault current's total time.
The foregoing is a preferred embodiment of the present invention, and it should be noted that it would be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the invention, and such modifications and enhancements are also considered to be within the scope of the invention.
Claims (1)
1. A direct current breaker with a breaking function is characterized by comprising a main breaking branch, a plurality of breaking branches and an energy absorption branch; the input end of the main breaking branch is used for being connected with the output end of the direct current bus; the output end of the main breaking branch is respectively connected with the input ends of the plurality of selective breaking branches; the input ends of the breaking branches are used for being connected with the line outgoing ends of the direct current bus in a one-to-one correspondence mode, and the output ends of the breaking branches are connected with the output ends of the breaking branches in a one-to-one correspondence mode; the input end of the energy-absorbing branch is connected with the input end of the main breaking branch, and the output end of the energy-absorbing branch is connected with the output end of the main breaking branch; the main breaking branch comprises a bridge type sub-module circuit, the input end of the bridge type sub-module circuit is connected with the input end of the main breaking branch, and the output end of the bridge type sub-module circuit is connected with the output end of the main breaking branch; the breaking branch comprises a quick mechanical switch and a current transfer switch; the input end of the rapid mechanical switch is connected with the input end of the breaking branch, the output end of the rapid mechanical switch is connected with the input end of the current transfer switch, and the output end of the current transfer switch is connected with the output end of the breaking branch; the selective breaking branch comprises an isolating switch and a thyristor circuit, the input end of the isolating switch is connected with the input end of the selective breaking branch, the output end of the isolating switch is connected with the input end of the thyristor circuit, and the output end of the thyristor circuit is connected with the output end of the selective breaking branch;
the bridge type submodule circuit comprises a plurality of bridge type submodule strings; the input end of any one bridge type submodule string is connected with the input end of the bridge type submodule circuit; the output end of any one bridge type submodule string is connected with the output end of the bridge type submodule circuit; the single bridge submodule string is formed by connecting Q bridge submodules in series;
the bridge type submodule comprises a first pole tube, a second diode, a third pole tube, a fourth pole tube and an insulated gate bipolar transistor, wherein the negative pole of the first pole tube is connected with the positive pole of the second diode, the negative pole of the second diode is connected with the collector electrode of the insulated gate bipolar transistor, the positive pole of the first pole tube is connected with the emitter electrode of the insulated gate bipolar transistor, the positive pole of the third pole tube is connected with the negative pole of the fourth pole tube, the negative pole of the third pole tube is connected with the collector electrode of the insulated gate bipolar transistor, and the positive pole of the fourth pole tube is connected with the emitter electrode of the insulated gate bipolar transistor;
the current transfer switch comprises a plurality of insulated gate bipolar transistor strings; the input end of any one insulated gate bipolar transistor string is connected with the input end of the current transfer switch, and the output end of any one insulated gate bipolar transistor string is connected with the output end of the current transfer switch; the single insulated gate bipolar transistor string is formed by connecting i insulated gate bipolar transistors in series;
the thyristor circuit comprises a plurality of thyristor strings; the input end of any one thyristor string is connected with the input end of the thyristor circuit, and the output end of any one thyristor string is connected with the output end of the thyristor circuit; wherein, a single thyristor string is formed by connecting M thyristors in series;
the energy absorption branch comprises a metal oxide arrester;
the control method of the direct current breaker with the breaking selection function comprises the following steps:
closing in normal working: when the direct current breaker normally operates, the full-bridge sub-module of the main breaking branch and the thyristor string of the selected breaking branch are disconnected, when a system is switched on during normal operation, the thyristor string of the selected breaking branch corresponding to the main breaking branch and a circuit needing to be switched on is switched on in a leading mode, then the quick mechanical switch on the corresponding circuit is closed, then the current transfer switch is switched on under a zero voltage difference state, finally the insulated gate bipolar transistor of the full-bridge sub-module in the main breaking branch is switched off, and when the current drops to a certain level, the thyristor string of the selected breaking branch is naturally switched off, so that the switching on of the direct current breaker is completed;
opening the brake in normal working: when the system is in normal operation, switching off is carried out, the thyristor string of the main breaking branch and the thyristor string of the selected branch corresponding to the circuit needing to be switched on are switched on in a pilot mode, then the current transfer switch is switched off, the rapid mechanical switch on the circuit needing to be switched off is switched off in an arc-free mode, finally the insulated gate bipolar transistor of the full bridge sub-module in the main breaking branch is switched off, and when the current is reduced to a certain level, the thyristor string of the selected breaking branch is naturally switched off, so that the switching off of the direct-current circuit breaker is completed;
and (3) switching off when a short-circuit fault occurs to the line: after the fault line is judged in the protection, the thyristor string of the selected branch corresponding to the fault line and the insulated gate bipolar transistor of the full-bridge submodule in the main broken branch are simultaneously conducted, then the current transfer switch is disconnected under the condition of zero voltage difference, the quick mechanical switch is disconnected, and finally the insulated gate bipolar transistor of the full-bridge submodule in the main broken branch is disconnected, and then, the residual energy in the line inductor and the line current limiting reactor can be absorbed by the energy absorption branch, and the fault current is completely removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811187976.9A CN109217239B (en) | 2018-10-12 | 2018-10-12 | Direct current breaker with breaking selection function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811187976.9A CN109217239B (en) | 2018-10-12 | 2018-10-12 | Direct current breaker with breaking selection function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109217239A CN109217239A (en) | 2019-01-15 |
| CN109217239B true CN109217239B (en) | 2020-07-24 |
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| CN110190583A (en) * | 2019-05-08 | 2019-08-30 | 广州京善电子有限公司 | DC grid leakage protection system |
| CN111463763B (en) * | 2020-05-09 | 2021-04-30 | 山东大学 | Multi-port hybrid direct-current circuit breaker with power flow control function and control method |
| CN112865046A (en) * | 2021-03-05 | 2021-05-28 | 全球能源互联网研究院有限公司 | Multifunctional multiport hybrid direct current breaker and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104993472A (en) * | 2015-08-07 | 2015-10-21 | 国网浙江省电力公司电力科学研究院 | MMC-HVDC system, DC side isolation device and isolation method |
| CN107453335A (en) * | 2016-05-30 | 2017-12-08 | 全球能源互联网研究院 | A kind of dc circuit breaker and its control method |
| CN107645154A (en) * | 2016-07-20 | 2018-01-30 | 全球能源互联网研究院有限公司 | A kind of novel combination type dc circuit breaker and its application process |
| CN107666140A (en) * | 2017-09-01 | 2018-02-06 | 天津大学 | A kind of combined DC breaker and its control method with multiple terminals |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104993472A (en) * | 2015-08-07 | 2015-10-21 | 国网浙江省电力公司电力科学研究院 | MMC-HVDC system, DC side isolation device and isolation method |
| CN107453335A (en) * | 2016-05-30 | 2017-12-08 | 全球能源互联网研究院 | A kind of dc circuit breaker and its control method |
| CN107645154A (en) * | 2016-07-20 | 2018-01-30 | 全球能源互联网研究院有限公司 | A kind of novel combination type dc circuit breaker and its application process |
| CN107666140A (en) * | 2017-09-01 | 2018-02-06 | 天津大学 | A kind of combined DC breaker and its control method with multiple terminals |
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