CN114243646A - Direct-current circuit breaker based on auxiliary oscillation current conversion device and control method thereof - Google Patents
Direct-current circuit breaker based on auxiliary oscillation current conversion device and control method thereof Download PDFInfo
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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
- 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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
Abstract
The invention relates to the technical field of flexible direct current power transmission and distribution, and particularly provides a direct current breaker based on an auxiliary oscillation current conversion device and a control method thereof, wherein the control method comprises the following steps: the main branch, the transfer branch and the energy absorption branch are connected in parallel in sequence; the main branch is composed of a mechanical switch CB; the transfer branch circuit consists of a resonant inductor L, a resonant capacitor C and an auxiliary oscillation commutation device AOD; the energy absorbing branch is constituted by the arrester MOV. The technical scheme provided by the invention has the characteristics of short full-current on-off time, large on-off current and the like, solves the problems of long full-current on-off time and high cost of a hybrid direct-current circuit breaker of the conventional mechanical direct-current circuit breaker, and can be applied to severe working conditions such as the requirement of a medium-high voltage flexible direct-current power grid on quick on-off of short-circuit current in a full range.
Description
Technical Field
The invention relates to the technical field of flexible direct current power transmission and distribution, in particular to a direct current breaker based on an auxiliary oscillation current conversion device and a control method thereof.
Background
Compared with an alternating current power grid, the direct current power grid based on the flexible direct current system has obvious advantages in aspects of large-capacity power transmission, distributed energy access, reactive power support of the alternating current system and the like, and is an important development direction of the power grid in the future. In a direct-current power grid, a direct-current circuit breaker which cuts off large current within milliseconds is required to be used for rapidly cutting off fault equipment or lines, so that stable operation of a non-fault part of a direct-current system is guaranteed, and the reliability of the system is improved. Therefore, dc breakers are a key piece of equipment for developing dc grids.
According to the difference of the on-off principle, the direct current circuit breaker can be divided into a hybrid type, a mechanical type and a solid state type, and has mature application under different system working conditions. The main current branch of the mechanical direct current circuit breaker adopts a traditional alternating current switch, the transfer branch adopts an LC oscillating circuit to generate a current zero crossing point, and the mechanical direct current circuit breaker can be divided into a passive type and an active type according to the difference of zero crossing modes. The passive direct-current circuit breaker is simple in structure and easy to control, but the passive direct-current circuit breaker depends heavily on the instability and negative resistance characteristics of electric arcs, and a main branch mechanical switch cannot adopt an arc extinguish chamber with positive volt-ampere characteristics such as a vacuum medium; in addition, due to the fact that the negative resistance value is limited, the total current on-off time can be as high as dozens of even hundreds of milliseconds, the direct current circuit breaker of the solution type is limited in on-off capacity, and in addition, fault clearing practice is too long, so that the direct current circuit breaker cannot be applied to working conditions such as high-voltage flexible direct current power grid short-circuit fault clearing and the like, wherein the on-off current value is large, and the total current clearing time is short.
Disclosure of Invention
In order to overcome the defects, the invention provides a direct current breaker based on an auxiliary oscillation current conversion device and a control method thereof.
In a first aspect, a dc circuit breaker based on an auxiliary oscillating commutation device is provided, the dc circuit breaker comprising: the main branch, the transfer branch and the energy absorption branch are connected in parallel in sequence;
the main branch is composed of a mechanical switch CB; the transfer branch circuit consists of a resonant inductor L, a resonant capacitor C and an auxiliary oscillation commutation device AOD; the energy absorbing branch is constituted by the arrester MOV.
Preferably, the auxiliary oscillation commutation device AOD includes a fully-controlled electronic switch S1, a diode D1, a fully-controlled electronic switch S2, a diode D2, a fully-controlled electronic switch S3, a diode D3, a fully-controlled electronic switch S4, a diode D4, a supporting capacitor Ca, a dc power supply U, a charging switch S, and a current-limiting resistor R.
Further, the fully-controlled electronic switch S1, the fully-controlled electronic switch S2, the fully-controlled electronic switch S3 and the fully-controlled electronic switch S4 are connected in anti-parallel with a diode D1, a diode D2, a diode D3 and a diode D4 respectively to form a half-bridge structure H1, a half-bridge structure H2, a half-bridge structure H3 and a half-bridge structure H4;
the half-bridge structure H1 and the half-bridge structure H2 are connected in series to form a first series structure;
the direct-current power supply U, the charging switch S and the current-limiting resistor R are connected in series to form a second series structure;
the half-bridge structure H3 and the half-bridge structure H4 are connected in series to form a third series structure;
the first series structure, the supporting capacitor Ca, the second series structure and the third series structure are connected in parallel in sequence.
Further, a connection point between the half-bridge structure H1 and the half-bridge structure H2 is connected with the resonant capacitor C, and a connection point between the half-bridge structure H3 and the half-bridge structure H4 is connected with the static side of the mechanical switch CB and the low-voltage end of the MOV.
Furthermore, the gate control signals of the full-control electronic switch S1, the full-control electronic switch S2, the full-control electronic switch S3 and the full-control electronic switch S4 are all controlled by high-frequency square wave signals, and the control frequency f is controlledLCIs calculated as follows:
fLC＝1\2π(LzCz)1\2
in the above formula, LzThe inductance value of the resonant inductor L, CzIs the capacitance value of the resonant capacitor C.
Furthermore, the amplitudes and phases of the gate control signals of the fully-controlled electronic switch S1, the fully-controlled electronic switch S2, the fully-controlled electronic switch S3 and the fully-controlled electronic switch S4 are the same, and the phase difference between the gate control signals of the fully-controlled electronic switch S1 and the fully-controlled electronic switch S4 and the gate control signals of the fully-controlled electronic switch S2 and the fully-controlled electronic switch S3 is 180 degrees.
Further, the amplitude of the H-bridge output voltage of the AOD of the auxiliary oscillation current converting device is UDCFrequency of fLCAlternating positive and negative high frequency square wave voltage, wherein, UDCTo support the charging voltage of the capacitor Ca.
In a second aspect, a method for controlling a dc circuit breaker based on the auxiliary oscillation commutation device is provided, the method comprising:
step 1, charging a support capacitor Ca by a direct current power supply U of the auxiliary oscillation current conversion device AOD, keeping a floating charging state after the support capacitor Ca is fully charged, and turning to step 2 when an external system has a short-circuit fault;
step 2, controlling a mechanical switch CB to open a brake and draw an arc, triggering a full-control electronic switch S1, a full-control electronic switch S2, a full-control electronic switch S3 and a full-control electronic switch S4 of the auxiliary oscillation commutation device AOD to enable the auxiliary oscillation commutation device AOD to operate, and applying a high-frequency and positive-negative alternating square wave voltage in a transfer branch circuit to enable the operation time to be the pulse width of a gate control signal of the auxiliary oscillation commutation device AOD;
step 3, detecting the current of the mechanical switch CB, controlling the main branch mechanical switch to carry out zero-crossing arc quenching when the oscillation amplitude of the current is higher than the required on-off fault current value, and controlling the fully-controlled electronic switch S1, the fully-controlled electronic switch S2, the fully-controlled electronic switch S3 and the fully-controlled electronic switch S4 of the auxiliary oscillation converter device AOD to be locked after delaying preset time;
the initial state of the mechanical switch CB is a closed state, the initial state of the charging switch S of the auxiliary oscillation commutation device AOD is a closed state, and the initial states of the fully-controlled electronic switch S1, the fully-controlled electronic switch S2, the fully-controlled electronic switch S3, and the fully-controlled electronic switch S4 of the auxiliary oscillation commutation device AOD are all closed states.
In a third aspect, a storage device is provided, in which a plurality of program codes are stored, the program codes being adapted to be loaded and run by a processor to execute the control method according to any one of the above technical solutions.
In a fourth aspect, there is provided a control device comprising a processor and a storage device, the storage device being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform the control method of any of the preceding claims.
One or more technical schemes of the invention at least have one or more of the following beneficial effects:
the invention relates to the technical field of flexible direct current power transmission and distribution, and particularly provides a direct current breaker based on an auxiliary oscillation current conversion device and a control method thereof, wherein the control method comprises the following steps: the main branch, the transfer branch and the energy absorption branch are connected in parallel in sequence; the main branch is composed of a mechanical switch CB; the transfer branch circuit consists of a resonant inductor L, a resonant capacitor C and an auxiliary oscillation commutation device AOD; the energy absorbing branch is constituted by the arrester MOV. Compared with the prior art, the technical scheme provided by the invention has the following effects:
(1) the arc extinguishing chamber is independent of the negative resistance characteristic of the electric arc, has low requirements on the mechanical switch arc extinguishing chamber, can be used for vacuum and SF6 arc extinguishing chambers and the like, and has strong applicability;
(2) the main branch is only provided with a mechanical switch, the on-state loss is extremely low, a water cooling device is not needed, the structure is simple, and the cost is low;
(3) the auxiliary oscillation current conversion device can generate a plurality of zero-crossing points, and the follow-up zero-crossing on/off can be still ensured when the first zero-crossing point cannot be quenched, so that the reliability is high;
(4) compared with a conventional mechanical circuit breaker, the capacitor has the advantages of low capacitance value, small volume and convenient arrangement;
(5) the auxiliary oscillation current conversion device adopts a high-frequency square wave control signal, the frequency and the duty ratio are adjustable, adaptation can be performed according to different loop stray parameters, and the flexibility is high;
(6) the power-on and power-off capability is high and far higher than that of a passive direct-current circuit breaker with the same voltage class.
Drawings
Fig. 1 is a main structural block diagram of a dc circuit breaker based on an auxiliary oscillation commutation device according to an embodiment of the present invention;
FIG. 2 is a block diagram of the main structure of an auxiliary oscillating inverter device AOD according to an embodiment of the present invention;
FIG. 3 is a diagram of an LC low frequency oscillation test loop according to an embodiment of the present invention;
fig. 4 is a first expanded structural diagram of a dc circuit breaker based on an auxiliary oscillation commutation device according to an embodiment of the present invention;
fig. 5 is a second expanded structural diagram of the dc circuit breaker based on the auxiliary oscillation commutation device according to the embodiment of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
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.
Referring to fig. 1, fig. 1 is a schematic diagram of the main structure of a dc circuit breaker based on an auxiliary oscillating inverter according to an embodiment of the present invention. As shown in fig. 1, the dc circuit breaker based on the auxiliary oscillation commutation device in the embodiment of the present invention mainly includes: the main branch, the transfer branch and the energy absorption branch are connected in parallel in sequence;
the main branch is composed of a mechanical switch CB; the transfer branch circuit consists of a resonant inductor L, a resonant capacitor C and an auxiliary oscillation commutation device AOD; the energy absorbing branch is constituted by the arrester MOV.
In this embodiment, the auxiliary oscillation commutation device AOD includes a fully-controlled electronic switch S1, a diode D1, a fully-controlled electronic switch S2, a diode D2, a fully-controlled electronic switch S3, a diode D3, a fully-controlled electronic switch S4, a diode D4, a supporting capacitor Ca, a dc power supply U, a charging switch S, and a current-limiting resistor R.
In one embodiment, as shown in fig. 2, the fully-controlled electronic switch S1, the fully-controlled electronic switch S2, the fully-controlled electronic switch S3, and the fully-controlled electronic switch S4 are connected in anti-parallel with a diode D1, a diode D2, a diode D3, and a diode D4, respectively, to form a half-bridge structure H1, a half-bridge structure H2, a half-bridge structure H3, and a half-bridge structure H4;
the half-bridge structure H1 and the half-bridge structure H2 are connected in series to form a first series structure;
the direct-current power supply U, the charging switch S and the current-limiting resistor R are connected in series to form a second series structure;
the half-bridge structure H3 and the half-bridge structure H4 are connected in series to form a third series structure;
the first series structure, the supporting capacitor Ca, the second series structure and the third series structure are connected in parallel in sequence.
The connection point between the half-bridge structure H1 and the half-bridge structure H2 is connected with the resonant capacitor C, and the connection point between the half-bridge structure H3 and the half-bridge structure H4 is connected with the static side of the mechanical switch CB and the low-voltage end of the MOV.
In one embodiment, the gate control signals of the fully-controlled electronic switch S1, the fully-controlled electronic switch S2, the fully-controlled electronic switch S3 and the fully-controlled electronic switch S4 are all controlled by high-frequency square wave signals, and the control frequency f is controlledLCIs calculated as follows:
fLC＝1\2π(LzCz)1\2
in the above formula, LzThe inductance value of the resonant inductor L, CzIs the capacitance value of the resonant capacitor C.
In one embodiment, the gate control signals of the fully-controlled electronic switch S1, the fully-controlled electronic switch S2, the fully-controlled electronic switch S3 and the fully-controlled electronic switch S4 have the same amplitude and phase, and the gate control signals of the fully-controlled electronic switch S1 and the fully-controlled electronic switch S4 have a phase difference of 180 degrees from the gate control signals of the fully-controlled electronic switch S2 and the fully-controlled electronic switch S3.
In one embodiment, the amplitude of the H-bridge output voltage of the auxiliary oscillating inverter device AOD is UDCFrequency of fLCAlternating positive and negative high frequency square wave voltage, wherein, UDCTo support the charging voltage of the capacitor Ca.
Further, the present invention also provides a method for controlling a dc circuit breaker based on the auxiliary oscillation commutation device, where the method includes:
step 1, charging a support capacitor Ca by a direct current power supply U of the auxiliary oscillation current conversion device AOD, keeping a floating charging state after the support capacitor Ca is fully charged, and turning to step 2 when an external system has a short-circuit fault;
step 2, controlling a mechanical switch CB to open a brake and draw an arc, triggering a full-control electronic switch S1, a full-control electronic switch S2, a full-control electronic switch S3 and a full-control electronic switch S4 of the auxiliary oscillation commutation device AOD to enable the auxiliary oscillation commutation device AOD to operate, and applying a high-frequency and positive-negative alternating square wave voltage in a transfer branch circuit to enable the operation time to be the pulse width of a gate control signal of the auxiliary oscillation commutation device AOD;
step 3, detecting the current of the mechanical switch CB, controlling the main branch mechanical switch to carry out zero-crossing arc quenching when the oscillation amplitude of the current is higher than the required on-off fault current value, and controlling the fully-controlled electronic switch S1, the fully-controlled electronic switch S2, the fully-controlled electronic switch S3 and the fully-controlled electronic switch S4 of the auxiliary oscillation converter device AOD to be locked after delaying preset time;
the initial state of the mechanical switch CB is a closed state, the initial state of the charging switch S of the auxiliary oscillation commutation device AOD is a closed state, and the initial states of the fully-controlled electronic switch S1, the fully-controlled electronic switch S2, the fully-controlled electronic switch S3, and the fully-controlled electronic switch S4 of the auxiliary oscillation commutation device AOD are all closed states.
In an embodiment, to further illustrate the operating principle of the dc circuit breaker based on the auxiliary oscillation commutation device according to the embodiment of the present invention, a specific implementation engineering of the LC low-frequency oscillation test circuit is described with reference to an application environment shown in fig. 3, where the LC low-frequency oscillation test circuit is composed of a dc power supply U, a charging switch K0, an energy storage capacitor C1, discharging switches K1 and K3, discharging resistors R1 and R2, a resonant inductor L1, and a closing switch K2.
Further, the implementation process is as follows:
(1) before the test: the charging switch K0, the discharging switches K1 and K3 and the closing switch K2 are in an opening state, the test sample mechanical switch CB is closed, and a full-control electronic switch in the auxiliary converter AOD is in a locking state;
(2) during the test: firstly, operating a charging switch K0 to switch on to charge an energy storage capacitor C1, and after the charging is finished, switching off the K0;
(3) at the time of T0, the auxiliary switch K2 is switched on, the energy storage capacitor C1 generates a low-frequency oscillating sinusoidal current through the resonant inductor L1 and passes through the test article main circuit breaker CB, and the test current starts to rise;
(4) at the time of T1, when the current rises to a certain amplitude, the main branch mechanical switch CB starts to open the brake and burn the arc, and simultaneously the electronic switch of the auxiliary converter AOD enables the action, a high-frequency oscillation voltage with constant amplitude and alternating positive and negative is applied to the transfer branch, and a current with increasing amplitude and high-frequency oscillation is formed between the resonance capacitor C and the resonance inductor L and the main branch;
(5) at the time of T2, when the amplitude of the high-frequency current is large enough, an artificial zero crossing point is generated, the main branch mechanical switch is extinguished, and transient overvoltage occurs at two ends of the test sample; when the voltage reaches the action voltage of the energy consumption branch lightning arrester, the energy consumption branch is conducted, and the MOV absorbs energy to complete disconnection.
(6) At the time of T3, the test loop current drops to zero, and at this time, the voltage U at both ends of the test article is still higher than its rated dc voltage, and since the transfer branch capacitor C still has residual energy, it forms an oscillating current with the test loops L1 and C1, and the voltage also oscillates accordingly.
(7) At the time of T4, a discharge switch K1 is switched on, and residual energy in a test loop capacitor C1 is released; then the discharge switch K3 is closed to release the residual energy in the sample.
In another embodiment, the working principle of the dc circuit breaker based on the auxiliary oscillation commutation device provided by the present invention can also be realized in the form as shown in fig. 4 and 5;
further, the present invention provides a storage device, in which a plurality of program codes are stored, the program codes being adapted to be loaded and executed by a processor to perform the control method according to any one of the above technical solutions.
Further, the present invention provides a control device comprising a processor and a storage device, wherein the storage device is adapted to store a plurality of program codes, and the program codes are adapted to be loaded and run by the processor to execute the control method according to any one of the above technical solutions.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A dc circuit breaker based on an auxiliary oscillating commutation device, characterized in that it comprises: the main branch, the transfer branch and the energy absorption branch are connected in parallel in sequence;
the main branch is composed of a mechanical switch CB; the transfer branch circuit consists of a resonant inductor L, a resonant capacitor C and an auxiliary oscillation commutation device AOD; the energy absorbing branch is constituted by the arrester MOV.
2. The method as claimed in claim 1, wherein said auxiliary oscillating inverter AOD is composed of a fully controlled electronic switch S1, a diode D1, a fully controlled electronic switch S2, a diode D2, a fully controlled electronic switch S3, a diode D3, a fully controlled electronic switch S4, a diode D4, a supporting capacitor Ca, a dc power U, a charging switch S, and a current limiting resistor R.
3. The method of claim 2, wherein the fully-controlled electronic switch S1, S2, S3 and S4 are connected in anti-parallel with a diode D1, a diode D2, a diode D3 and a diode D4 respectively to form a half-bridge structure H1, a half-bridge structure H2, a half-bridge structure H3 and a half-bridge structure H4;
the half-bridge structure H1 and the half-bridge structure H2 are connected in series to form a first series structure;
the direct-current power supply U, the charging switch S and the current-limiting resistor R are connected in series to form a second series structure;
the half-bridge structure H3 and the half-bridge structure H4 are connected in series to form a third series structure;
the first series structure, the supporting capacitor Ca, the second series structure and the third series structure are connected in parallel in sequence.
4. The method of claim 3 wherein the junction between the half-bridge structure H1 and the half-bridge structure H2 is connected to a resonant capacitor C and the junction between the half-bridge structure H3 and the half-bridge structure H4 is connected to the dead side of a mechanical switch CB and the low voltage terminal of an MOV.
5. The method of claim 3, wherein the gate control signals of the fully-controlled electronic switch S1, the fully-controlled electronic switch S2, the fully-controlled electronic switch S3 and the fully-controlled electronic switch S4 are all controlled by high-frequency square wave signals with the control frequency fLCIs calculated as follows:
fLC＝1\2π(LzCz)1\2
in the above formula, LzThe inductance value of the resonant inductor L, CzIs the capacitance value of the resonant capacitor C.
6. The method of claim 5, wherein the gate control signals of the fully-controlled electronic switch S1, the fully-controlled electronic switch S2, the fully-controlled electronic switch S3 and the fully-controlled electronic switch S4 have the same amplitude and phase, and the gate control signals of the fully-controlled electronic switch S1 and the fully-controlled electronic switch S4 have a phase difference of 180 degrees from the gate control signals of the fully-controlled electronic switch S2 and the fully-controlled electronic switch S3.
7. The method of claim 5, wherein the auxiliary oscillationThe amplitude of the H bridge output voltage of the converter AOD is UDCFrequency of fLCAlternating positive and negative high frequency square wave voltage, wherein, UDCTo support the charging voltage of the capacitor Ca.
8. A method for controlling a dc breaker based on an auxiliary oscillating inverter device according to any of claims 1-7, characterized in that the method comprises:
step 1, charging a support capacitor Ca by a direct current power supply U of the auxiliary oscillation current conversion device AOD, keeping a floating charging state after the support capacitor Ca is fully charged, and turning to step 2 when an external system has a short-circuit fault;
step 2, controlling a mechanical switch CB to open a brake and draw an arc, triggering a full-control electronic switch S1, a full-control electronic switch S2, a full-control electronic switch S3 and a full-control electronic switch S4 of the auxiliary oscillation commutation device AOD to enable the auxiliary oscillation commutation device AOD to operate, and applying a high-frequency and positive-negative alternating square wave voltage in a transfer branch circuit to enable the operation time to be the pulse width of a gate control signal of the auxiliary oscillation commutation device AOD;
step 3, detecting the current of the mechanical switch CB, controlling the main branch mechanical switch to carry out zero-crossing arc quenching when the oscillation amplitude of the current is higher than the required on-off fault current value, and controlling the fully-controlled electronic switch S1, the fully-controlled electronic switch S2, the fully-controlled electronic switch S3 and the fully-controlled electronic switch S4 of the auxiliary oscillation converter device AOD to be locked after delaying preset time;
step 4, when the total voltage between the ends of the direct current breaker reaches the reference voltage of the lightning arrester, controlling the lightning arrester to conduct and absorb energy;
the initial state of the mechanical switch CB is a closed state, the initial state of the charging switch S of the auxiliary oscillation commutation device AOD is a closed state, and the initial states of the fully-controlled electronic switch S1, the fully-controlled electronic switch S2, the fully-controlled electronic switch S3, and the fully-controlled electronic switch S4 of the auxiliary oscillation commutation device AOD are all closed states.
9. A storage device having a plurality of program codes stored therein, wherein said program codes are adapted to be loaded and run by a processor to execute the control method of claim 8.
10. A control device comprising a processor and a memory device adapted to store a plurality of program codes, characterized in that said program codes are adapted to be loaded and run by said processor to perform the control method according to claim 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111293300.XA CN114243646A (en) | 2021-11-03 | 2021-11-03 | Direct-current circuit breaker based on auxiliary oscillation current conversion device and control method thereof |
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| CN202111293300.XA CN114243646A (en) | 2021-11-03 | 2021-11-03 | Direct-current circuit breaker based on auxiliary oscillation current conversion device and control method thereof |
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| CN202111293300.XA Pending CN114243646A (en) | 2021-11-03 | 2021-11-03 | Direct-current circuit breaker based on auxiliary oscillation current conversion device and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114709800A (en) * | 2022-04-28 | 2022-07-05 | 西安交通大学 | Compact direct-current circuit breaker sharing branch circuit and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114709800A (en) * | 2022-04-28 | 2022-07-05 | 西安交通大学 | Compact direct-current circuit breaker sharing branch circuit and control method thereof |
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