CN113257597A - Hybrid direct current breaker based on composite current conversion mode and control method thereof - Google Patents
Hybrid direct current breaker based on composite current conversion mode and control method thereof Download PDFInfo
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- CN113257597A CN113257597A CN202110668991.0A CN202110668991A CN113257597A CN 113257597 A CN113257597 A CN 113257597A CN 202110668991 A CN202110668991 A CN 202110668991A CN 113257597 A CN113257597 A CN 113257597A
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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
- 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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- 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
- H01H2009/543—Contacts shunted by static switch means third parallel branch comprising an energy absorber, e.g. MOV, PTC, Zener
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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
- H01H2009/544—Contacts shunted by static switch means the static switching means being an insulated gate bipolar transistor, e.g. IGBT, Darlington configuration of FET and bipolar transistor
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Abstract
The invention provides a hybrid direct current breaker based on a composite current conversion mode and a control method thereof, wherein the direct current breaker comprises a main current branch, a transfer branch II and an energy consumption branch which are connected in parallel, wherein: the main through-flow branch comprises a quick mechanical switch A and a quick mechanical switch B which are connected in series, and a transfer branch I is connected in parallel on the quick mechanical switch B, wherein: the transfer branch I comprises a first bidirectional solid-state switch module and a first energy absorption module which are connected in parallel. The direct current circuit device has the advantages of near-zero conduction loss, simple structure of the commutation component, rapid and reliable commutation and the like, and can realize the arc-free on-off of partial switches.
Description
Technical Field
The invention belongs to the technical field of circuit protection, and particularly relates to a hybrid direct current breaker based on a composite current conversion mode and a control method thereof.
Background
The flexible direct-current power grid has more complex and various system main wiring structures and operation modes, so that the direct-current system has multiple fault modes, fast fault development and wide influence range. Therefore, a fault isolation technology of the flexible direct current power grid is urgently needed to ensure safe and reliable operation of the flexible direct current power grid. The direct current breaker is the most ideal choice for realizing direct current fault isolation in the direct current transmission and distribution system. When the current hybrid direct current circuit breaker is high in fault current rise rate and large in fault current, the problem that the fault current is difficult to transfer from the main through-current branch to the transfer branch exists, and therefore the hybrid direct current circuit breaker based on the composite current conversion mode and the control method thereof need to be designed, so that the fault current can be simply and quickly transferred from the main through-current branch to the transfer branch.
Disclosure of Invention
In view of the above problems, the present invention provides a hybrid dc circuit breaker based on a composite commutation manner, where the dc circuit breaker includes a main through-current branch, a transfer branch II, and an energy consumption branch connected in parallel, where:
the main through-flow branch comprises a quick mechanical switch A and a quick mechanical switch B which are connected in series, and a transfer branch I is connected in parallel on the quick mechanical switch B, wherein:
the transfer branch I comprises a first bidirectional solid-state switch module and a first energy absorption module which are connected in parallel.
Further, the transfer branch II includes a second bidirectional solid-state switch module.
Furthermore, the energy consumption branch comprises a second energy absorption module.
Further, the first bidirectional solid-state switch module and the second bidirectional solid-state switch module may each adopt any one of an anti-series connection structure module, a full-bridge structure module and a diode bridge structure module.
Further, the first energy absorption module and the second energy absorption module are both metal oxide piezoresistors.
Further, the fast mechanical switch A is a first vacuum fast mechanical switch; the quick mechanical switch B is a second vacuum quick mechanical switch or a gas quick mechanical switch.
The invention also provides a control method of the hybrid direct current circuit breaker based on the composite commutation mode, which comprises the following steps:
when a direct current system has a fault, controlling a quick mechanical switch B of a main through-current branch circuit to be switched off, and controlling a first bidirectional solid-state switch module of a transfer branch circuit I and a transfer branch circuit II to be kept in a conducting state;
and when the fault current of the main current branch is completely transferred to the transfer branch I, the first bidirectional solid-state switch module of the transfer branch I is turned off.
Further, when the fast mechanical switch B of the main through-current branch is controlled to open, the arc voltage of the fast mechanical switch B can drive the current on the fast mechanical switch B to be transferred to the transfer branch I.
Furthermore, after the contact gap after the rapid mechanical switch B is switched off can bear the transient recovery voltage of the transfer branch I, the first bidirectional solid-state switch module of the transfer branch I is switched off, and the current on the transfer branch I is transferred to the transfer branch II under the control of the first energy absorption module in the transfer branch I.
Furthermore, the transfer branch circuit II comprises a second bidirectional solid-state switch module, the energy consumption branch circuit comprises a second energy absorption module, and the rapid mechanical switch A is controlled to be switched off after the current on the transfer branch circuit I is completely transferred to the transfer branch circuit II;
after the contact gap of the rapid mechanical switch A can bear the transient recovery voltage of the transfer branch circuit II, the second bidirectional solid-state switch module in the transfer branch circuit II is turned off, the current on the transfer branch circuit II is transferred to the energy consumption branch circuit connected with the transfer branch circuit II in parallel, the voltage between the ends of the direct-current circuit breaker is limited by the second energy absorption module on the energy consumption branch circuit, and the fault current gradually drops to 0.
Further, the fast mechanical switch A is a first vacuum fast mechanical switch; the quick mechanical switch B is a second vacuum quick mechanical switch or a gas quick mechanical switch.
Further, the first energy absorption module and the second energy absorption module are both metal oxide piezoresistors.
Further, the first bidirectional solid-state switch module and the second bidirectional solid-state switch module may adopt any one of an anti-series connection structure module, a full-bridge structure module and a diode bridge structure module.
According to the hybrid direct current breaker based on the composite commutation mode and the control method thereof, the natural commutation and forced commutation phase composition of the direct current breaker is realized through the arranged transfer branch I and the transfer branch II. The direct current circuit device has the advantages of near-zero conduction loss, simple structure of the commutation component, rapid and reliable commutation and the like, and can realize the arc-free on-off of part of switches.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a schematic circuit diagram of a dc circuit breaker according to an embodiment of the invention.
Fig. 2 shows a diagram of the change of the system current, the fast mechanical switch B current, the main through-current branch current, the transfer branch I current, the transfer branch II current, and the energy consuming branch current and the break voltage according to an embodiment of the present invention.
Fig. 3 is a schematic diagram illustrating a static contact and a movable contact maintaining a closing state according to an embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating movement of an arc generated by the fixed contact and the movable contact after being opened according to the embodiment of the invention.
Fig. 5 is a schematic diagram illustrating that the arc movement generated by the fixed contact and the movable contact after being opened is elongated according to the embodiment of the present invention.
Fig. 6 illustrates a first bidirectional solid state switch module or a second bidirectional solid state switch module topology according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
The invention provides a hybrid direct current breaker based on a composite current conversion mode, which comprises a main current branch, a transfer branch II and an energy consumption branch which are connected in parallel, wherein:
the main through-flow branch comprises a plurality of quick mechanical switches B and a transfer branch I which are connected in parallel, and when the quick mechanical switches B are multiple, the quick mechanical switches B are connected in series.
The main through-flow branch also comprises a quick mechanical switch A which is connected with a quick mechanical switch B in series, the number of the quick mechanical switches A can be one or more, and when the number of the quick mechanical switches A is multiple, the multiple quick mechanical switches A are connected in series; further, the Fast Mechanical Switch a is a first Vacuum Fast Mechanical Switch (Vacuum Fast Mechanical Switch), and the Fast Mechanical Switch B is a second Vacuum Fast Mechanical Switch or a Gas Fast Mechanical Switch (Gas Fast Mechanical Switch).
When the quick mechanical switch B is a second vacuum quick mechanical switch, an external magnetic field is adopted on each second vacuum quick mechanical switch to increase the arc voltage after the second vacuum quick mechanical switch is switched off, and when the quick mechanical switch B is a gas quick mechanical switch, the external magnetic field is also adopted on the gas quick mechanical switch to increase the arc voltage of the gas quick mechanical switch. Specifically, each of the first vacuum fast mechanical switch, the second vacuum fast mechanical switch and the second vacuum fast mechanical switch includes a moving contact and a fixed contact, as shown in fig. 3, a schematic diagram of a closing state of the fixed contact and the moving contact is shown, as shown in fig. 4, after a magnetic field is applied, and the fixed contact is separated from the moving contact, an electric arc is generated between the fixed contact and the moving contact, a current direction of the electric arc is set to be downward, a direction of the magnetic field is perpendicular to a contact gap between the fixed contact and the moving contact and is inward, the electric arc is subjected to rightward ampere force and moves rightward, on the premise that the magnetic field is sufficiently large (for example, tens of millitesla), the electric arc will rapidly move to an edge of the contact gap between the fixed contact and the moving contact within a short time (for example, one millisecond) to form a form similar to an arch bridge as shown in fig. 5, an arc length of the electric arc in the form is rapidly elongated, because an arc voltage and an arc length are in a positive correlation, the arc voltage of the gas arc will rise rapidly.
As shown in fig. 1, the transfer branch I includes a first bidirectional solid-state switch module and a first energy absorption module connected in parallel, and further, there may be one or more first bidirectional solid-state switch modules, and when there are a plurality of first bidirectional solid-state switch modules, the plurality of first bidirectional solid-state switch modules are connected in series. Further, the first bidirectional solid-state switch module may employ any one of an anti-series configuration module, a full-bridge configuration module, and a diode bridge configuration module.
Specifically, as shown in fig. 6, the anti-series connection module includes two first fully-controlled power electronic devices, cathodes of the two first fully-controlled power electronic devices are connected in series, a first diode is connected in anti-parallel to the first fully-controlled power electronic device, a cathode of the first diode is connected to an anode of the first fully-controlled power electronic device, and an anode of the first diode is connected to a cathode of the first fully-controlled power electronic device. The full-bridge structure module comprises a capacitor and four second full-control power electronic devices, wherein cathodes of the two second full-control power electronic devices are connected with one end of the capacitor, anodes of the other two second full-control power electronic devices are connected with the other end of the capacitor, anodes of the two second full-control power electronic devices are respectively connected with cathodes of the other two second full-control power electronic devices, second diodes are connected to the second full-control power electronic devices in a reverse parallel mode, cathodes of the second diodes are connected with anodes of the second full-control power electronic devices, and anodes of the second diodes are connected with cathodes of the second full-control power electronic devices. The diode bridge structure module comprises a third full-control power electronic device and four third diodes, wherein cathodes of the two third diodes are connected with an anode of the third full-control power electronic device, anodes of the other two third diodes are connected with a cathode of the third full-control power electronic device, anodes of the two third diodes are respectively connected with cathodes of the other two third diodes, a fourth diode is connected to the third full-control power electronic device in an anti-parallel mode, a cathode of the fourth diode is connected with an anode of the third full-control power electronic device, and an anode of the fourth diode is connected with a cathode of the third full-control power electronic device.
The first, second and third fully-controlled power electronic devices may be any one of Insulated Gate Bipolar Transistors (IGBTs), Integrated Gate Commutated Thyristors (IGCTs) and Gate injection Enhanced transistors (IEGTs).
The transfer branch II is connected in parallel with the entire main through-flow branch, specifically, as shown in fig. 1, the fast mechanical switch a is connected in series with the fast mechanical switch B, and then connected in parallel with the transfer branch II. Furthermore, in the case that there are a plurality of fast mechanical switches a and a plurality of fast mechanical switches B, then the plurality of fast mechanical switches a connected in series are connected in series with the plurality of fast mechanical switches B connected in series. Furthermore, the transfer branch II includes a plurality of second bidirectional solid-state switch modules, and the plurality of second bidirectional solid-state switch modules are connected in series, and further, in this embodiment, the first bidirectional solid-state switch module and the second bidirectional solid-state switch module have the same structure.
The transfer branch circuit II is connected with an energy consumption branch circuit in parallel, the energy consumption branch circuit comprises a second energy absorption module, and the second energy absorption module is also a metal oxide piezoresistor.
IN this embodiment, when a dc system connected to the dc circuit breaker does not have a fault, the system current of the dc system and the main through-current branch current on the main through-current branch may not rise abnormally, and the main through-current branch current may flow through the main through-current branch, that is, the main through-current branch current may flow IN from the input end of the dc circuit breaker and flow OUT from the output end of the dc circuit breaker, and further, IN fig. 1, IN and OUT are the input end and the output end of the dc circuit breaker, respectively. The first bidirectional solid-state switch module on the transfer branch I is in a non-conductive state at this time, and the second bidirectional solid-state switch module on the transfer branch II is also in a non-conductive state.
In this embodiment, the control principle of the dc circuit breaker is as follows:
let the DC system be at t1At the moment of time, a short-circuit fault occurs, as shown in diagram a in fig. 2, the system current and the current flowing into the main current branch being at t1All the time starts to rise, the current on the fast mechanical switch B also starts to rise, and at t1After a moment, the current on the fast mechanical switch B is a fault current, the magnitude of which continuously increases with the influence of the fault. At t1At any moment, the direct-current circuit breaker receives a switching-off command, and after the direct-current circuit breaker receives the switching-off command, a switching-off command is firstly sent to the quick mechanical switch B to control the quick mechanical switch B of the main through-current branch to switch off, and meanwhile, the first bidirectional solid-state switch module of the transfer branch I and the transfer branch II are controlled to be kept in a conducting state. Since the transfer branch II includes the second bidirectional solid-state switch module, the second bidirectional solid-state switch module also remains in a conductive state at this time.
After the rapid mechanical switch B of the main through-flow branch circuit is controlled to be switched off, the arc voltage of the rapid mechanical switch B can drive the current on the rapid mechanical switch B to be transferred to the transfer branch circuit I. Specifically, after a certain period of time (the time when the moving contact and the static contact of the fast mechanical switch B are just separated) has elapsed from the fast mechanical switch B, at t2At the moment, the rapid mechanical switch B just starts arcing, the arc voltage of the rapid mechanical switch B just starting arcing drives the fault current to start naturally converting from the rapid mechanical switch B to the transfer branch I, and t3And the transfer is completed at any moment, the first commutation is completed, and the first commutation is natural commutation.
At t3At the moment, the fault current on the main current branch is completely transferred to the transfer branch I, at the moment, the current on the quick mechanical switch B can pass through zero, after the zero passage, the arc is extinguished between the moving contact and the static contact of the quick mechanical switch B, then, the moving contact of the quick mechanical switch B continues to perform the opening motion, and at t4At the moment, the contact gap after the rapid mechanical switch B is opened can bear the transient recovery voltage on the transfer branch I, that is, the contact gap cannot be arcing under the action of the transient recovery voltage, the first bidirectional solid-state switch module in the transfer branch I is controlled to be turned off, and the fault current can be transferred to the first energy absorption module connected in parallel with the first bidirectional solid-state switch module. Since the first energy absorption module is a metal oxide varistor, according to the nonlinear volt-ampere characteristic of the metal oxide varistor, at t4At that moment, a voltage of the order of kilovolts will be rapidly built up across transfer branch I, and therefore, under the control of the first energy absorption module, this voltage will drive a rapid transfer of the fault current onto transfer branch II, and at t5And the transfer is completed at the moment, the second commutation is completed, and the second commutation is forced commutation.
Preset t5The instant at which the opening command is issued to the fast mechanical switch A, and therefore the instant at which the current on the transfer branch I is completely transferred to the transfer branch II, i.e. t5At any moment, the direct current breaker sends a brake opening command to the quick mechanical switch A to control the quick mechanical switch A to open. Fast mechanical switch A at t5Just after the momentSeparating and realizing the non-arc separation between the moving contact and the static contact, then, the moving contact of the rapid mechanical switch A continues to make the opening movement, and after the contact gap of the rapid mechanical switch A can bear the transient recovery voltage of the transfer branch II, at t6At the moment, the second bidirectional solid-state switch module in the transfer branch II is turned off, and the fault current is transferred to the energy consumption branch connected with the transfer branch II in parallel at t7The transfer is completed at that time.
In this embodiment, since the second energy absorption module is a metal oxide varistor, according to the nonlinear volt-ampere characteristic of the metal oxide varistor, at t7To t8In the period, the voltage between the ends of the direct current breaker is limited by the second energy absorption module on the energy consumption branch circuit, and the fault current gradually drops to 0.
In fig. 2, a diagram shows a system current, a fast mechanical switch B current, a main through-current branch current, a transfer branch I current, a transfer branch II current and an energy consumption branch current change diagram after a dc system where the dc breaker is located has a fault, and in the diagram, t1At the moment, the system current and the current of the fast mechanical switch B start to rise; t is t2To t3At the moment, it is the process of current transfer of the fast mechanical switch B to the transfer branch I, in particular, at t2At the moment, the current of the branch I starts to increase from 0, the current of the fast mechanical switch B starts to decrease, and the current t3At the moment, the current of the fast mechanical switch B is reduced to 0; t is t4To t5At the moment, it is the process of current transfer in the transfer branch I to the transfer branch II, specifically at t4At the moment, the current of the branch I starts to decrease, the current of the branch II starts to increase, and at t5At the moment, the current of the transfer branch I is reduced to 0; t is t6To t7At time, the process of transferring the current of the transfer branch II to the energy consumption branch, specifically, at t6At the moment, the current of the transfer branch circuit II begins to decrease, the current of the energy consumption branch circuit begins to increase, and at t7At the moment, the current of the transfer branch II is reduced to 0; t is t7To t8At the moment, the second energy absorption module limits the voltage between the ends of the direct current breaker and absorbs the fault energy of the direct current system, and the specific process isAt t7At the moment, the fault current reaches the maximum value Ip, since the two ends of the second energy absorption module are connected to the input and output of the dc breaker, at t7The fault current at the moment is the system current, and the fault current is at t7The time begins to gradually decrease, at t8The time drops to zero.
The diagram b in fig. 2 is a diagram illustrating the voltage change of the dc circuit breaker after the dc system has a fault. t is t4Before the moment, the voltage at two ends of the direct current breaker is not more than the arc voltage (within 200V) of the rapid mechanical switch B, and can be ignored; t is t4To t5At the moment, the first bidirectional solid-state switch module of the transfer branch circuit I is switched off, the metal oxide piezoresistor connected in parallel flows through current, and voltage smaller than system voltage is generated according to the nonlinear volt-ampere characteristic of the metal oxide piezoresistor and is also equal to fracture voltage of the direct-current circuit breaker. t is t5After the moment, the fracture voltage of the direct current breaker is equal to the conduction voltage drop of the whole transfer branch II and can be ignored. At t6At the moment, the second bidirectional solid-state switch module in the transfer branch II is turned off, the fault current is transferred to the energy consumption branch connected with the transfer branch II in parallel, and due to the fact that the metal oxide piezoresistor is arranged on the energy consumption branch, a voltage larger than the system voltage can be generated according to the nonlinear volt-ampere characteristic of the metal oxide piezoresistor, and the voltage is at t7Will reach U at any momentpThis voltage is also equal to the breaking voltage of the dc breaker at that time. At t7After that time, as the current decreases, the voltage across the metal oxide varistor decreases slowly. When the current is reduced to 0, the direct current breaker is completely switched off, and the break voltage of the direct current breaker is equal to the system voltage Udc。
In addition, in the present embodiment, it should be noted that:
one is as follows: the total rated withstand voltage of the plurality of fast mechanical switches a should be greater than the turn-off transient recovery voltage of the transfer branch II.
The second step is as follows: the number of first bi-directional solid-state switch modules in the transfer branch I should not be excessive, otherwise the speed of the first commutation will be affected. The number of first bidirectional solid-state switch modules may be one for dc systems below 200kV bus voltage.
And thirdly: the longer the recovery time of the gas medium in the arc extinguishing chamber of the gas rapid mechanical switch after the arc is, the more the turn-off time of the first bidirectional solid-state switch module on the transfer branch I is delayed, so that when the rapid mechanical switch B adopts the gas rapid mechanical switch, the characteristic that the recovery time of the gas medium in the arc extinguishing chamber of the gas rapid mechanical switch after the arc is longer is fully considered, and the suitable turn-off time of the first bidirectional solid-state switch module on the transfer branch I is selected; because the higher the residual voltage of the metal oxide piezoresistor is, the faster the corresponding first commutation speed is, but the required gas medium in the arc extinguishing chamber of the gas rapid mechanical switch has longer recovery time after the arc is generated, the residual voltage of the metal oxide piezoresistor in the transfer branch I can be properly reduced according to the requirement of the first commutation speed.
It is to be understood that the terms "upwardly," "downwardly," "leftward," "rightward," "vertical," "inwardly," and the like are used herein for purposes of description only. Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (13)
1. The utility model provides a hybrid direct current breaker based on compound current conversion mode which characterized in that, direct current breaker is including parallel connection's main through-current branch road, transfer branch road II and power consumption branch road, wherein:
the main through-flow branch comprises a quick mechanical switch A and a quick mechanical switch B which are connected in series, and a transfer branch I is connected in parallel on the quick mechanical switch B, wherein:
the transfer branch I comprises a first bidirectional solid-state switch module and a first energy absorption module which are connected in parallel.
2. A hybrid dc circuit breaker according to claim 1, wherein the transfer branch II comprises a second bidirectional solid-state switch module.
3. A hybrid dc circuit breaker according to claim 1, wherein the energy consuming branch comprises a second energy absorption module.
4. A hybrid dc circuit breaker based on compound commutation scheme as claimed in claim 2, wherein the first bidirectional solid-state switch module and the second bidirectional solid-state switch module each employ any one of an anti-series configuration module, a full-bridge configuration module and a diode bridge configuration module.
5. A hybrid dc circuit breaker according to claim 3, wherein the first energy absorption module and the second energy absorption module are both metal oxide varistors.
6. A hybrid dc circuit breaker based on compound commutation scheme as claimed in claim 1, wherein the fast mechanical switch a is a first vacuum fast mechanical switch; the quick mechanical switch B is a second vacuum quick mechanical switch or a gas quick mechanical switch.
7. A method for controlling a hybrid dc circuit breaker based on a compound commutation scheme, wherein the dc circuit breaker is according to any one of claims 1-3, the method comprising:
when a direct current system has a fault, controlling a quick mechanical switch B of a main through-current branch circuit to be switched off, and controlling a first bidirectional solid-state switch module of a transfer branch circuit I and a transfer branch circuit II to be kept in a conducting state;
and when the fault current of the main current branch is completely transferred to the transfer branch I, the first bidirectional solid-state switch module of the transfer branch I is turned off.
8. The control method of the hybrid direct current breaker based on the compound commutation mode as claimed in claim 7, wherein when the fast mechanical switch B of the main current branch is controlled to open, the arc voltage of the fast mechanical switch B drives the current on the fast mechanical switch B to be transferred to the transfer branch I.
9. The control method of the hybrid direct current breaker based on the compound commutation mode as claimed in claim 8, wherein after the contact gap after the fast mechanical switch B is opened can bear the transient recovery voltage of the transfer branch I, the first bidirectional solid-state switch module of the transfer branch I is turned off, and the current on the transfer branch I is transferred to the transfer branch II under the control of the first energy absorption module in the transfer branch I.
10. The control method of the hybrid direct current breaker based on the compound commutation method as claimed in claim 9, wherein the transfer branch II includes a second bidirectional solid-state switch module, and the energy-consuming branch includes a second energy-absorbing module, and is characterized in that after the current in the transfer branch I is completely transferred to the transfer branch II, the fast mechanical switch a is controlled to open;
after the contact gap of the rapid mechanical switch A can bear the transient recovery voltage of the transfer branch circuit II, the second bidirectional solid-state switch module in the transfer branch circuit II is turned off, the current on the transfer branch circuit II is transferred to the energy consumption branch circuit connected with the transfer branch circuit II in parallel, the voltage between the ends of the direct-current circuit breaker is limited by the second energy absorption module on the energy consumption branch circuit, and the fault current gradually drops to 0.
11. The control method of the hybrid direct current breaker based on the compound commutation mode as claimed in claim 10, wherein the fast mechanical switch a is a first vacuum fast mechanical switch; the quick mechanical switch B is a second vacuum quick mechanical switch or a gas quick mechanical switch.
12. The method for controlling a hybrid direct current breaker according to claim 10, wherein the first energy absorption module and the second energy absorption module are both metal oxide varistors.
13. The method as claimed in claim 10, wherein the first bidirectional solid-state switching module and the second bidirectional solid-state switching module each employ any one of an anti-series connection structure module, a full-bridge structure module and a diode bridge structure module.
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| CN113872155A (en) * | 2021-11-01 | 2021-12-31 | 清华大学 | Mechanical breaker for generator outlet and control method thereof |
| CN113922330A (en) * | 2021-09-15 | 2022-01-11 | 清华大学 | Generator outlet circuit breaker based on composite current conversion mode and control method thereof |
| CN113964788A (en) * | 2021-10-26 | 2022-01-21 | 西安交通大学 | Bidirectional direct current breaker and switching-on/off method |
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