CN111509681A - Solid-state direct-current circuit breaker sharing energy consumption branch and application method thereof - Google Patents
Solid-state direct-current circuit breaker sharing energy consumption branch and application method thereof Download PDFInfo
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- CN111509681A CN111509681A CN202010327086.4A CN202010327086A CN111509681A CN 111509681 A CN111509681 A CN 111509681A CN 202010327086 A CN202010327086 A CN 202010327086A CN 111509681 A CN111509681 A CN 111509681A
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- 238000000034 method Methods 0.000 title claims abstract description 82
- 238000005265 energy consumption Methods 0.000 title claims abstract description 69
- 238000001514 detection method Methods 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 9
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 3
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- 230000005611 electricity Effects 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 3
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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
- 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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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Abstract
The embodiment of the invention discloses a solid-state direct current breaker sharing an energy consumption branch and an application method thereof. This solid-state formula direct current circuit breaker includes: the intelligent energy-saving circuit comprises a first main through-current branch, a second main through-current branch, an energy consumption branch, a first intelligent switch, a first resistor, a second intelligent switch and a second resistor; the first main through-current branch and the second main through-current branch share an energy consumption branch through a first intelligent switch, a first resistor, a second intelligent switch and a second resistor respectively; the first intelligent switch and the second intelligent switch comprise half-bridge type power electronic switch sets. Compared with the prior art, the embodiment of the invention reduces the equipment volume and the occupied area of the solid-state direct current circuit breaker, improves the equipment utilization rate, reduces the cost of the solid-state direct current circuit breaker, and improves the reliability and the practicability of the solid-state direct current circuit breaker.
Description
Technical Field
The embodiment of the invention relates to the technical field of switching devices, in particular to a solid-state direct current breaker sharing an energy consumption branch and an application method thereof.
Background
In recent years, the demand of alternating current and direct current hybrid power supply is more and more, and the advantage of developing a direct current power distribution network is more and more obvious. This is because a large amount of direct current is supplied to household electrical equipment, and the loss of converting alternating current into direct current is increasing. In addition, with the progress of power electronics technology, it has become possible to develop a solid-state type dc circuit breaker. The solid-state dc circuit breaker has the advantages of flexible turn-off, large current capacity and fast turn-off speed of fault current, and is increasingly the subject of research in the industry.
In the prior art, a solid-state dc circuit breaker is formed by connecting a single main current branch and an energy consumption branch in parallel, but as the application number of the solid-state dc circuit breaker is increased, the problems of large equipment volume, large occupied area and high price exist, and the wider application of the solid-state dc circuit breaker is limited.
Disclosure of Invention
The embodiment of the invention provides a solid-state direct current breaker sharing an energy consumption branch circuit and an application method thereof, which are used for reducing the equipment volume and the occupied area of the solid-state direct current breaker, improving the equipment utilization rate and reducing the cost of the solid-state direct current breaker.
In a first aspect, an embodiment of the present invention provides a solid-state dc circuit breaker sharing a power consumption branch, where the solid-state dc circuit breaker includes:
the first main through-current branch comprises a first end and a second end, and is used for switching on and off a first direct current or fault current;
the second main through-current branch comprises a first end and a second end, and is used for switching on and off a second path of direct current or fault current;
an energy consumption branch comprising a first end and a second end;
the first intelligent switch comprises a control end, a first end and a second end, the control end of the first intelligent switch is connected with a control signal, the first end of the first intelligent switch is electrically connected with the first end of the first main through-current branch circuit, and the second end of the first intelligent switch is electrically connected with the first end of the energy consumption branch circuit;
the first end of the first resistor is electrically connected with the second end of the first main current branch circuit, and the second end of the first resistor is electrically connected with the second end of the energy consumption branch circuit;
the second intelligent switch comprises a control end, a first end and a second end, the control end of the second intelligent switch is connected with a control signal, the first end of the second intelligent switch is electrically connected with the first end of the second main through-current branch circuit, and the second end of the second intelligent switch is electrically connected with the first end of the energy consumption branch circuit;
the first end of the second resistor is electrically connected with the second end of the second main current branch circuit, and the second end of the second resistor is electrically connected with the second end of the energy consumption branch circuit;
wherein the first intelligent switch and the second intelligent switch both comprise half-bridge type power electronic switch sets.
Optionally, the solid-state dc circuit breaker further comprises:
the third main through-current branch comprises a first end and a second end, and is used for switching on and off a third path of direct current or fault current;
the control end of the third intelligent switch is connected with a control signal, the first end of the third intelligent switch is electrically connected with the first end of the third main through-current branch circuit, and the second end of the third intelligent switch is electrically connected with the first end of the energy consumption branch circuit;
the first end of the third resistor is electrically connected with the second end of the third main current branch circuit, and the second end of the third resistor is electrically connected with the second end of the energy consumption branch circuit;
wherein the third intelligent switch comprises a half-bridge power electronic switch group.
Optionally, the half-bridge power electronic switch group comprises:
a gate of the first insulated gate bipolar transistor is connected to the control signal, and a collector of the first insulated gate bipolar transistor is used as a first end of the half-bridge power electronic switch group;
the anode of the first diode is electrically connected with the emitter of the first insulated gate bipolar transistor, and the cathode of the first diode is electrically connected with the collector of the first insulated gate bipolar transistor;
a gate of the second insulated gate bipolar transistor is connected to the control signal, a collector of the second insulated gate bipolar transistor is used as a second end of the half-bridge power electronic switch group, and an emitter of the second insulated gate bipolar transistor is electrically connected with an emitter of the first insulated gate bipolar transistor;
and the anode of the second diode is electrically connected with the emitter of the second insulated gate bipolar transistor, and the cathode of the second diode is electrically connected with the collector of the second insulated gate bipolar transistor.
Optionally, the first main current branch comprises: at least one first power electronic switch set;
the second main current branch includes: at least one second power electronic switch bank;
the third main current branch includes: at least one third power electronic switch set.
Optionally, the first power electronic switch bank comprises: the half-bridge type power electronic switch group or the full-bridge type power electronic switch group;
the second power electronic switch group comprises the half-bridge type power electronic switch group or a full-bridge type power electronic switch group;
the third power electronic switch group comprises the half-bridge type power electronic switch group or the full-bridge type power electronic switch group.
Optionally, the energy consumption branch comprises: at least one of a non-linear resistor and a zinc oxide arrester.
In a second aspect, an embodiment of the present invention further provides an application method of a solid-state dc circuit breaker sharing an energy consumption branch according to any embodiment of the present invention, where the application method includes a power-on transmission process, where the power-on transmission process includes:
controlling the first main through-current branch, the second main through-current branch, the first intelligent switch and the second intelligent switch to be turned off;
controlling the first intelligent switch to be conducted;
controlling the first main through-current branch to be conducted; and controlling the first intelligent switch to be turned off;
controlling the second intelligent switch to be conducted;
controlling the second main through-current branch to be conducted; and controlling the second intelligent switch to be switched off.
Optionally, after controlling the second intelligent switch to turn off, the method further includes:
controlling the third intelligent switch to be conducted;
controlling the third main through-current branch to be conducted; and controlling the third intelligent switch to be switched off.
Optionally, the application method further includes: a turn-off process of the first main current branch, a turn-off process of the second main current branch, or a turn-off process of the third main current branch;
the shutdown process of the first main current branch comprises:
controlling the first intelligent switch to be conducted;
controlling the first main through-current branch to be turned off;
the shut-down procedure of the second main current branch comprises:
controlling the second intelligent switch to be conducted;
controlling the second main through-current branch to be turned off;
the shut-down procedure of the third main current branch comprises:
controlling the third intelligent switch to be conducted;
and controlling the third main through-flow branch to be switched off.
Optionally, the application method further includes: a fault detection process; the fault detection process includes:
if a ground fault occurs outside the first resistor, executing a turn-off process of the first main through-current branch;
performing a conducting process of the first main through-current branch at a preset time after the first main through-current branch is turned off; if the fault current exists, the turn-off process of the first main through-current branch is repeatedly executed;
if a ground fault occurs outside the second resistor, executing a turn-off process of the second main through-current branch;
executing the conducting process of the second main through-current branch at a preset time after the second main through-current branch is switched off; if the fault current exists, the turn-off process of the second main through-current branch is repeatedly executed;
if a ground fault occurs outside the third resistor, executing a turn-off process of the third main through-current branch;
performing a conduction process of the third main through-current branch at a preset time after the third main through-current branch is turned off; and if the fault current exists, repeatedly executing the turn-off process of the third main through-current branch.
According to the embodiment of the invention, the energy consumption branch can be shared by at least two branch systems by arranging the first intelligent switch, the second intelligent switch, the first resistor and the second resistor, and the first intelligent switch, the second intelligent switch and the third intelligent switch comprise half-bridge type power electronic switch sets. On the first hand, the use of the energy consumption branch can be saved by sharing the energy consumption branch, so that the occupied area of the solid-state direct-current circuit breaker is reduced, the equipment is more compact, and the utilization rate of the equipment is higher; in the second aspect, the components in the solid-state direct current circuit breaker are expensive, and the cost of the solid-state direct current circuit breaker is reduced by reducing energy consumption branches, so that the solid-state direct current circuit breaker is more widely applied; in a third aspect, the embodiment of the invention can flexibly open and close the connection between circuits at high speed, the half-bridge power electronic switch group comprises power electronic switches, the on and off time of the power electronic switches is shorter, the speed is faster, and the current of the half-bridge power electronic switch group has a flexible control function of bidirectional circulation and can bear larger current, thereby providing a reliable foundation for realizing that at least two branch systems share the energy consumption branch. Therefore, the embodiment of the invention improves the reliability and the practicability of the solid-state direct current circuit breaker sharing the energy consumption branch.
Drawings
Fig. 1 is a schematic structural diagram of a solid-state dc circuit breaker sharing an energy consumption branch according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a half-bridge power electronic switch set according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a conducting power transmission process of a solid-state dc circuit breaker sharing a power consumption branch according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a ground fault occurring in a solid-state dc circuit breaker sharing an energy consumption branch according to a third embodiment of the present invention;
fig. 5 is a schematic flowchart of a fault detection process of a solid-state dc circuit breaker sharing an energy consumption branch according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic structural diagram of a solid-state dc circuit breaker sharing an energy consumption branch according to an embodiment of the present invention. The solid-state direct current circuit breaker can be suitable for switching on at least two paths of normal direct current and switching off fault current in a low-voltage distribution network. Referring to fig. 1, taking the solid-state dc circuit breaker including three main current branches as an example, the solid-state dc circuit breaker sharing the energy consumption branch includes: first main current branch 100, second main current branch 200, third main current branch 300, power consumption branch 400, first intelligent switch 500, first resistor R1, second intelligent switch 600, second resistor R2, third intelligent switch 700, and third resistor R3.
First main current branch 100 includes a first terminal and a second terminal, and first main current branch 100 is configured to disconnect a first dc current or fault current. The first main current branch 100 can pass the line rated current for a long time. Optionally, the first main current branch 100 includes at least one first power electronic switch bank, which includes a half-bridge type power electronic switch bank or a full-bridge type power electronic switch bank.
The second main current branch 200 includes a first terminal and a second terminal, and the second main current branch 200 is configured to disconnect a second direct current or fault current. The second main current branch 200 can pass the line rated current for a long time. Optionally, the second main current branch 200 includes at least one second power electronic switch bank, which includes a half-bridge type power electronic switch bank or a full-bridge type power electronic switch bank.
The third main current branch 300 includes a first terminal and a second terminal, and the third main current branch 300 is configured to switch off a third direct current or fault current. The third main current branch 300 can pass the line rated current for a long time. Optionally, the third main current branch 300 includes at least one third power electronic switch bank, which includes a half-bridge type power electronic switch bank or a full-bridge type power electronic switch bank.
The energy consuming branch 400 includes a first end and a second end. The energy consumption branch 400 may also be referred to as an energy absorption branch, and is used for absorbing energy generated by the power electronic switch during the turn-off process. Optionally, the power consumption branch 400 includes at least one of a non-linear resistor or a zinc oxide arrester (MOV).
First intelligent switch 500 includes control end, first end and second end, and control signal is inserted to first intelligent switch 500's control end, and first intelligent switch 500's first end is connected with the first end electricity of first main through-current branch road 100, and first intelligent switch 500's second end is connected with the first end electricity of energy consumption branch road 400. I.e., first intelligent switch 500 is connected between first main current branch 100 and power consumption branch 400.
First resistor R1 includes a first terminal and a second terminal, the first terminal of first resistor R1 is electrically coupled to the second terminal of first main current branch 100, and the second terminal of first resistor R1 is electrically coupled to the second terminal of power consumption branch 400. I.e., first resistor R1, is connected between first main current branch 100 and power consumption branch 400. Optionally, the first resistor R1 is a fixed resistance value for creating a voltage difference between the first main current branch 100, the second main current branch 200, and the third main current branch 300, avoiding direct connection of the 3 branches.
A second resistor R2 includes a first terminal and a second terminal, the first terminal of the second resistor R2 is electrically coupled to the second terminal of the second main current branch 200, and the second terminal of the second resistor R2 is electrically coupled to the second terminal of the power consumption branch 400. I.e., second resistor R2, is connected between second main current branch 200 and power consumption branch 400. Optionally, the second resistor R2 is a fixed resistance value for creating a voltage difference between the first main current branch 100, the second main current branch 200, and the third main current branch 300, avoiding direct connection of the 3 branches.
The third intelligent switch 700 comprises a control end, a first end and a second end, the control end of the third intelligent switch 700 is connected with a control signal, the first end of the third intelligent switch 700 is electrically connected with the first end of the third main through-current branch circuit 300, and the second end of the third intelligent switch 700 is electrically connected with the first end of the energy consumption branch circuit 400. That is, third smart switch 700 is connected between third main current branch 300 and power consumption branch 400.
A third resistor R3 includes a first terminal and a second terminal, the first terminal of the third resistor R3 is electrically coupled to the second terminal of the third main current branch 300, and the second terminal of the third resistor R3 is electrically coupled to the second terminal of the power consumption branch 400. That is, third resistor R3 is connected between third main current branch 300 and power consumption branch 400. Optionally, the third resistor R3 is a fixed resistance value for creating a voltage difference between the first main current branch 100, the second main current branch 200, and the third main current branch 300, avoiding direct connection of the 3 branches.
The first intelligent switch 500, the second intelligent switch 600 and the third intelligent switch 700 are arranged as the key of the shared energy consumption branch 400, and the first intelligent switch 500, the second intelligent switch 600 and the third intelligent switch 700 in the solid-state dc circuit breaker provided by the embodiment of the present invention all include a half-bridge power electronic switch group.
According to the embodiment of the invention, the first intelligent switch 500, the second intelligent switch 600, the third intelligent switch 700, the first resistor R1, the second resistor R2 and the third resistor R3 are arranged, so that the energy consumption branch 400 shared by three branch systems can be realized, and the first intelligent switch 500, the second intelligent switch 600 and the third intelligent switch 700 comprise half-bridge type power electronic switch sets. On the first hand, the use of two sets of energy consumption branches 400 can be saved by sharing the energy consumption branch 400, so that the occupied area of the solid-state direct-current circuit breaker is reduced, the equipment is more compact, and the utilization rate of the equipment is higher; in the second aspect, the components in the solid-state dc circuit breaker are expensive, and the cost of the solid-state dc circuit breaker is reduced by reducing two sets of energy consumption branches 400, which is beneficial to wider application of the solid-state dc circuit breaker; in a third aspect, the embodiment of the present invention can flexibly open and close the connection between the circuits at a high speed, the half-bridge power electronic switch group includes power electronic switches, the on and off time of the power electronic switches is shorter, the speed is faster, and the current of the half-bridge power electronic switch group has a flexible control function of bidirectional circulation and can bear larger current, thereby providing a reliable basis for realizing that the three branch systems share the energy consumption branch 400. Therefore, the embodiment of the present invention improves the reliability and the practicability of the solid-state dc circuit breaker sharing the energy consumption branch 400.
Fig. 2 is a schematic structural diagram of a half-bridge power electronic switch set according to an embodiment of the present invention. Referring to fig. 2, a half-bridge type power electronic switch block includes: a first insulated gate bipolar transistor IGBT1, a second insulated gate bipolar transistor IGBT2, a first diode D1, and a second diode D2.
A gate electrode of the first insulated gate bipolar transistor IGBT1 is connected with a control signal, and a collector electrode of the first insulated gate bipolar transistor IGBT1 is used as a first end of the half-bridge type power electronic switch group; the anode of the first diode D1 is electrically connected to the emitter of the first IGBT1, and the cathode of the first diode D1 is electrically connected to the collector of the first IGBT 1; a gate electrode of the second insulated gate bipolar transistor IGBT2 is connected with a control signal, a collector electrode of the second insulated gate bipolar transistor IGBT2 serves as a second end of the half-bridge power electronic switch group, and an emitter electrode of the second insulated gate bipolar transistor IGBT2 is electrically connected with an emitter electrode of the first insulated gate bipolar transistor IGBT 1; the anode of the second diode D2 is electrically connected to the emitter of the second insulated gate bipolar transistor IGBT2, and the cathode of the second diode D2 is electrically connected to the collector of the second insulated gate bipolar transistor IGBT 2.
That is to say, the half-bridge power electronic switch group is composed of 2 igbts and 2 diodes, and the structure is that two diodes are reversely connected in series, and 2 igbts are respectively reversely connected in parallel with the two diodes, so that the half-bridge power electronic switch group has a flexible control function of bidirectional circulation and can bear larger current.
It should be noted that the present invention exemplarily illustrates that the solid-state dc circuit breaker includes 3 main current branches, which is not a limitation of the present invention, and the present invention can also be applied to 2 or more than 3 main current branches.
It should be further noted that the structures of the first power electronic switch group in the first main current branch 100, the second power electronic switch group in the second main current branch 200, and the third power electronic switch group in the third main current branch 300 may be the same or different.
Alternatively, the power electronic switch group in each main through-current branch may be a half-bridge type power electronic switch group as shown in fig. 2, or may be a full-bridge type power electronic switch group. The full-bridge power electronic switch group can be formed by connecting two half-bridge power electronic switch groups in parallel; the full-bridge power electronic switch group can also comprise an intermediate module, the intermediate module is connected with the half-bridge power electronic switch group in parallel, the intermediate module has shunting and filtering functions, when the power electronic switches in the full-bridge power electronic switch group are turned off or turned on, the current can fluctuate, and the intermediate module has a turn-on high-frequency current at the moment, so that overcurrent or overvoltage is prevented from being generated on the power electronic switches. Illustratively, the intermediate module can be a capacitor structure, a capacitor and resistor parallel structure and a diode series structure, or an insulated gate bipolar transistor and diode inverse parallel structure.
Example two
On the basis of the foregoing embodiments, a second embodiment provides an application method of the solid-state dc circuit breaker sharing the energy consumption branch as provided in the first embodiment. The application method comprises the steps of switching off normal direct current and switching off fault current. Fig. 3 is a schematic flowchart of a conducting power transmission process of a solid-state dc circuit breaker sharing a power consumption branch according to a second embodiment of the present invention. Referring to fig. 3, the power-on process includes the following steps:
and S110, controlling the first main current branch circuit, the second main current branch circuit, the third main current branch circuit, the first intelligent switch, the second intelligent switch and the third intelligent switch to be turned off.
The first main through-current branch, the second main through-current branch, the third main through-current branch, the first intelligent switch, the second intelligent switch and the third intelligent switch are all turned off, namely the solid-state direct-current circuit breaker is in an initial state. Optionally, in S110, it may be further confirmed that the solid-state dc breaker has been connected to the line.
And S120, controlling the first intelligent switch to be conducted, and connecting the energy consumption branch in parallel to the first main through-current branch.
S130, controlling the first main through-current branch to be conducted; and controls the first intelligent switch to be turned off.
Wherein the first main current branch comprises at least one first power electronic switch group. Then, the first main through-current branch is controlled to be conducted, that is, the power electronic switches in the first power electronic switch group are controlled to be conducted sequentially.
And S140, controlling the second intelligent switch to be conducted, and connecting the energy consumption branch in parallel to the second main through-current branch.
S150, controlling the second main current branch to be conducted; and controls the second intelligent switch to be switched off.
Wherein the second main current branch comprises at least one second power electronic switch group. Then, the second main through-current branch is controlled to be conducted, that is, the power electronic switches in the second power electronic switch group are controlled to be conducted sequentially.
And S160, controlling the third intelligent switch to be conducted, and connecting the energy consumption branch in parallel to the third main through-current branch.
S170, controlling the third main through-current branch to be conducted; and controls the third intelligent switch to be switched off.
Through S110-S170, the conduction power transmission process of 3 main through-current branches of the solid-state direct-current circuit breaker sharing the energy consumption branch is completed.
EXAMPLE III
On the basis of the second embodiment, when a line fails or is normally cut off, the first main flow branch, the second main flow branch or the third main flow branch of the solid-state dc circuit breaker sharing the energy consumption branch needs to be controlled to be turned off.
Wherein the switching off process of the first main current branch comprises: controlling the first intelligent switch to be conducted, and connecting the energy consumption branch in parallel to the first main through-current branch; and controlling the first main through-flow branch to be turned off, and consuming redundant energy generated in the turning-off process through the energy consumption branch.
The switching off process of the second main current branch comprises: controlling the second intelligent switch to be conducted, and connecting the energy consumption branch in parallel to the second main through-current branch; and controlling the second main through-flow branch to be turned off, and consuming redundant energy generated in the turning-off process through the energy consumption branch.
The shutdown process for the third main current branch comprises: controlling the third intelligent switch to be conducted, and connecting the energy consumption branch in parallel to the third main through-current branch; and controlling the third main through-flow branch to be turned off, and consuming redundant energy generated in the turning-off process through the energy consumption branch.
In the foregoing technical solution, optionally, before controlling the first intelligent switch to be turned on, before controlling the second intelligent switch to be turned on, or before controlling the third intelligent switch to be turned on, the method further includes confirming an initial state. The initial state of the turn-off process is the final state of the turn-on power transmission process, that is, the state after S170 in the second embodiment. Through the step of confirming initial state, be favorable to avoiding direct current breaker's maloperation to be favorable to the stable work of electric wire netting.
Fig. 4 is a schematic structural diagram of a solid-state dc circuit breaker sharing an energy consumption branch circuit according to a third embodiment of the present invention. Fig. 5 is a schematic flowchart of a fault detection process of a solid-state dc circuit breaker sharing an energy consumption branch according to a third embodiment of the present invention. Referring to fig. 4 and 5, on the basis of the above-described shutdown process, the fault detection process includes the steps of:
s210, if a ground fault occurs outside the first resistor, controlling the first intelligent switch to be conducted; the energy consumption branch is connected in parallel to the first main through-flow branch.
And S220, controlling the first main through-flow branch to be turned off, and consuming redundant energy generated in the turning-off process through the energy consumption branch.
Wherein the first main current branch comprises at least one first power electronic switch group. Then, the first main through-current branch is controlled to be turned off, that is, the power electronic switches in the first power electronic switch group are controlled to be sequentially locked.
And S230, executing the conduction process of the first main through-current branch at the preset time after the first main through-current branch is turned off, and restarting the conduction and power transmission of the first main through-current branch.
The preset time may be, for example, 1 second, and the conducting process of the first main current branch may be, for example, S110 to S130 in the second embodiment.
S240, if fault current exists, repeatedly executing the turn-off process of the first main through-flow branch, and permanently turning off the first main through-flow branch; and if no fault current exists, the first main flow branch continues to supply power.
Through S210-S240, the fault detection process of the first main through-current branch of the solid-state type direct current circuit breaker sharing the energy consumption branch is completed.
Similar to the fault detection process for the first main current branch, the fault detection process for the second main current branch includes: if a ground fault occurs outside the second resistor, executing the turn-off process of the second main through-current branch; executing the conducting process of the second main through-current branch at the preset time after the second main through-current branch is switched off; if a fault current exists, the switching-off process of the second main through-current branch is repeatedly executed.
Similar to the fault detection process for the first main current branch and the second main current branch, the fault detection process for the third main current branch includes: if a ground fault occurs outside the third resistor, executing the turn-off process of the third main through-current branch; executing the conducting process of the third main through-current branch at the preset time after the third main through-current branch is switched off; if a fault current exists, the turn-off process of the third main through-current branch is repeatedly executed.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A solid state DC circuit breaker sharing a power branch, comprising:
the first main through-current branch comprises a first end and a second end, and is used for switching on and off a first direct current or fault current;
the second main through-current branch comprises a first end and a second end, and is used for switching on and off a second path of direct current or fault current;
an energy consumption branch comprising a first end and a second end;
the first intelligent switch comprises a control end, a first end and a second end, the control end of the first intelligent switch is connected with a control signal, the first end of the first intelligent switch is electrically connected with the first end of the first main through-current branch circuit, and the second end of the first intelligent switch is electrically connected with the first end of the energy consumption branch circuit;
the first end of the first resistor is electrically connected with the second end of the first main current branch circuit, and the second end of the first resistor is electrically connected with the second end of the energy consumption branch circuit;
the second intelligent switch comprises a control end, a first end and a second end, the control end of the second intelligent switch is connected with a control signal, the first end of the second intelligent switch is electrically connected with the first end of the second main through-current branch circuit, and the second end of the second intelligent switch is electrically connected with the first end of the energy consumption branch circuit;
the first end of the second resistor is electrically connected with the second end of the second main current branch circuit, and the second end of the second resistor is electrically connected with the second end of the energy consumption branch circuit;
wherein the first intelligent switch and the second intelligent switch both comprise half-bridge type power electronic switch sets.
2. The solid-state dc circuit breaker sharing an energy consumption branch according to claim 1, further comprising:
the third main through-current branch comprises a first end and a second end, and is used for switching on and off a third path of direct current or fault current;
the control end of the third intelligent switch is connected with a control signal, the first end of the third intelligent switch is electrically connected with the first end of the third main through-current branch circuit, and the second end of the third intelligent switch is electrically connected with the first end of the energy consumption branch circuit;
the first end of the third resistor is electrically connected with the second end of the third main current branch circuit, and the second end of the third resistor is electrically connected with the second end of the energy consumption branch circuit;
wherein the third intelligent switch comprises a half-bridge power electronic switch group.
3. Solid-state direct current circuit breaker sharing an energy consumption branch according to claim 1 or 2, characterized in that said half-bridge power electronic switching group comprises:
a gate of the first insulated gate bipolar transistor is connected to the control signal, and a collector of the first insulated gate bipolar transistor is used as a first end of the half-bridge power electronic switch group;
the anode of the first diode is electrically connected with the emitter of the first insulated gate bipolar transistor, and the cathode of the first diode is electrically connected with the collector of the first insulated gate bipolar transistor;
a gate of the second insulated gate bipolar transistor is connected to the control signal, a collector of the second insulated gate bipolar transistor is used as a second end of the half-bridge power electronic switch group, and an emitter of the second insulated gate bipolar transistor is electrically connected with an emitter of the first insulated gate bipolar transistor;
and the anode of the second diode is electrically connected with the emitter of the second insulated gate bipolar transistor, and the cathode of the second diode is electrically connected with the collector of the second insulated gate bipolar transistor.
4. The solid state dc circuit breaker of claim 2, wherein the first main current branch comprises: at least one first power electronic switch set;
the second main current branch includes: at least one second power electronic switch bank;
the third main current branch includes: at least one third power electronic switch set.
5. The solid state dc circuit breaker of claim 4, wherein the first power electronic switch bank comprises: the half-bridge type power electronic switch group or the full-bridge type power electronic switch group;
the second power electronic switch group comprises the half-bridge type power electronic switch group or a full-bridge type power electronic switch group;
the third power electronic switch group comprises the half-bridge type power electronic switch group or the full-bridge type power electronic switch group.
6. Solid-state direct current circuit breaker sharing an energy consumption branch according to claim 1, characterized in that said energy consumption branch comprises: at least one of a non-linear resistor and a zinc oxide arrester.
7. The method for applying the solid-state direct current circuit breaker sharing the energy consumption branch circuit according to any one of claims 1 to 6, wherein the method comprises a conducting power transmission process, and the conducting power transmission process comprises the following steps:
controlling the first main through-current branch, the second main through-current branch, the first intelligent switch and the second intelligent switch to be turned off;
controlling the first intelligent switch to be conducted;
controlling the first main through-current branch to be conducted; and controlling the first intelligent switch to be turned off;
controlling the second intelligent switch to be conducted;
controlling the second main through-current branch to be conducted; and controlling the second intelligent switch to be switched off.
8. The method of claim 7, wherein the method for applying the solid-state dc circuit breaker sharing the energy consumption branch further comprises: the third main through-current branch, the third intelligent switch and the third resistor;
after controlling the second intelligent switch to be turned off, the method further comprises the following steps:
controlling the third intelligent switch to be conducted;
controlling the third main through-current branch to be conducted; and controlling the third intelligent switch to be switched off.
9. The method of claim 8, further comprising: a turn-off process of the first main current branch, a turn-off process of the second main current branch, or a turn-off process of the third main current branch;
wherein the shut-down procedure of the first main current branch comprises:
controlling the first intelligent switch to be conducted;
controlling the first main through-current branch to be turned off;
the shut-down procedure of the second main current branch comprises:
controlling the second intelligent switch to be conducted;
controlling the second main through-current branch to be turned off;
the shut-down procedure of the third main current branch comprises:
controlling the third intelligent switch to be conducted;
and controlling the third main through-flow branch to be switched off.
10. The method of claim 9, further comprising: a fault detection process; the fault detection process includes:
if a ground fault occurs outside the first resistor, executing a turn-off process of the first main through-current branch;
performing a conducting process of the first main through-current branch at a preset time after the first main through-current branch is turned off; if the fault current exists, the turn-off process of the first main through-current branch is repeatedly executed;
if a ground fault occurs outside the second resistor, executing a turn-off process of the second main through-current branch;
performing a conduction process of the second main through-current branch at the preset time after the second main through-current branch is turned off; if the fault current exists, the turn-off process of the second main through-current branch is repeatedly executed;
if a ground fault occurs outside the third resistor, executing a turn-off process of the third main through-current branch;
performing a conducting process of the third main through-current branch at the preset time after the third main through-current branch is turned off; and if the fault current exists, repeatedly executing the turn-off process of the third main through-current branch.
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