CN114336550A - Self-energy-taking multi-port direct-current circuit breaker and application method - Google Patents
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Abstract
The invention provides a self-energy-taking multiport direct current breaker and an application method thereof, wherein the breaker comprises: the system comprises a cut-off branch circuit, a plurality of through-current branch circuits and a plurality of auxiliary branch circuits, wherein each through-current branch circuit is connected in series with a corresponding direct current line, and the direct current lines and the through-current branch circuits are arranged in a one-to-one correspondence manner; the two ends of the cut-off branch are respectively connected with the two ends of the through-flow branch in parallel through an auxiliary branch, and the two ends of the cut-off branch are also respectively connected with the direct-current bus through an auxiliary branch. Compared with the single hybrid circuit breaker scheme full-control device with the same level of parameters and quantity, the method of combining the shared main circuit breaker and the auxiliary turn-off of the oscillation current injection saves the using quantity of the full-control devices by more than 70 percent, and greatly reduces the cost of the circuit breaker. The on-off current of the circuit breaker is not limited by the self-off capacity of a full-control device, the on-off capacity is greatly improved compared with that of a traditional hybrid circuit breaker, and the dual requirements of large-scale direct-current power grid construction on the technical performance and the economical performance of a direct-current circuit breaker are met.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a self-energy-taking multi-port direct-current circuit breaker and an application method thereof.
Background
Nowadays, a direct current power transmission and distribution technology becomes an effective means for large-scale transmission and consumption of renewable energy sources such as wind and light, and the like, and a high-voltage direct current breaker is a key device for developing the direct current power transmission and distribution to more economical and flexible networking.
With the development of high-voltage large-capacity direct-current power grids, the use number of the circuit breakers is increased, and the requirement for the breaking capacity of the circuit breakers is increased, so that the power grids have higher requirements for the technology and the economy of the high-voltage direct-current circuit breakers. The hybrid direct current circuit breaker adopts a mechanical switch and a power electronic device to be connected in a hybrid mode, and is a mainstream technical route in the field of high-voltage direct current circuit breakers at present. The on-off capacity of the hybrid circuit breaker is limited by the inherent current-cutting capacity of a full-control device, the on-off capacity is further difficult to improve, meanwhile, the circuit breaker is high in cost due to the fact that a large number of power electronic and mechanical switches are adopted, and the dual requirements of large-scale direct-current power grid construction on the technical performance and the economical performance of the direct-current circuit breaker are difficult to meet at the same time, so that the large-scale application of the high-voltage direct-current circuit breaker in a multi-terminal direct-current power grid is limited.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the direct current circuit breaker in the prior art cannot meet double requirements of technical performance and economical efficiency, so that the invention provides the self-energy-taking multi-port direct current circuit breaker and the application method thereof.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a self-energy-obtaining multi-port dc circuit breaker, including: a breaking branch, a plurality of through-flow branches, a plurality of auxiliary branches, wherein,
each through-current branch is connected in series with a corresponding direct-current line, and the direct-current lines and the through-current branches are arranged in a one-to-one correspondence manner;
the two ends of the cut-off branch are respectively connected with the two ends of the through-flow branch in parallel through one auxiliary branch, and the two ends of the cut-off branch are also respectively connected with the direct-current bus through one auxiliary branch.
Preferably, the self-energizing multi-port dc circuit breaker further comprises: and one end of the grounding branch is connected with the cut-off branch, and the other end of the grounding branch is grounded.
Preferably, the disconnection branch comprises at least one disconnection unit, the disconnection unit comprises an oscillation branch, an energy consumption branch and a disconnection branch, and the oscillation branch is connected with the energy consumption branch and the disconnection branch in parallel.
Preferably, the oscillating branch comprises: an oscillation capacitor, an oscillation inductor, a first thyristor unit and a second thyristor unit, wherein,
one end of the first thyristor unit is connected with one end of the oscillation capacitor and one end of the second thyristor unit respectively, the other end of the oscillation capacitor is connected with one end of the oscillation inductor, and the other end of the oscillation inductor is connected with the other end of the second thyristor unit.
Preferably, the first thyristor unit and the second thyristor unit each include at least one thyristor.
Preferably, the current branch comprises a mechanical switch and a current transfer switch, and the mechanical switch is connected in series with the current transfer switch.
Preferably, the auxiliary branch comprises:
a plurality of series connected one-way diode valves;
or, a mechanical switch and a plurality of series-connected one-way diode valves;
or, unidirectional choke switches and thyristors;
or, a plurality of series-connected unidirectional thyristors.
In a second aspect, an embodiment of the present invention provides an application method of a self-energized multiport dc breaker, where based on the first aspect, the application method of the self-energized multiport dc breaker includes:
acquiring the working state of the self-energy-taking multi-port direct current circuit breaker;
and switching the conduction states of the cut-off branch, the corresponding current branch and the corresponding auxiliary branch based on the working state.
Preferably, when the self-energy-taking multi-port dc circuit breaker is put into operation, the switching the conducting states of the open branch, the corresponding current branch and the corresponding auxiliary branch based on the operating state includes:
switching on the cut-off branch circuit and controlling the energy taking of the oscillation capacitor in the cut-off branch circuit;
and after the charging of the oscillating capacitor is finished, the plurality of through-current branches are conducted so that the current flows through the through-current branches.
Preferably, when at least one dc line of the self-energized multiport dc breaker is short-circuited and failed, the switching the conduction states of the open branch, the corresponding through-current branch, and the corresponding auxiliary branch based on the operating state includes:
switching on a full control device in the cut-off branch, locking a current transfer switch in the through-current branch, and forcing current to be transferred to the cut-off branch;
after the current of the through-current branch passes zero, a brake separating instruction is issued to a mechanical switch in the through-current branch, and a second thyristor unit in the cut-off branch is conducted at the same time;
after the mechanical switch in the through-flow branch is in place, a first thyristor unit in the cut-off branch is conducted, the oscillation branch is controlled to inject reverse oscillation current into the full-control device, and the full-control device is cut off when the current flowing through the full-control device is reduced to a cut-off set value;
controlling the current flowing through the cut-off branch circuit to be transferred to the oscillation branch circuit to charge the capacitance oscillation capacitor;
when the voltage of the oscillation capacitor reaches a preset protection voltage threshold value, the energy consumption branch circuit is conducted, and the current is transferred to the energy consumption branch circuit to circulate.
The technical scheme of the invention has the following advantages:
the self-energy-taking multi-port direct current breaker provided by the invention has the advantages that the method of combining the shared main breaker and the auxiliary turning-off of the oscillation current injection is adopted, the using amount of the full-control devices is saved by more than 70% compared with the single mixed breaker scheme with the same level of parameters and quantity, and the cost of the breaker is greatly reduced. The on-off current of the circuit breaker is not limited by the self-off capacity of a full-control device, the on-off capacity is greatly improved compared with that of a traditional hybrid circuit breaker, and the dual requirements of large-scale direct-current power grid construction on the technical performance and the economical performance of a direct-current circuit breaker are met.
According to the application method of the self-energy-taking multi-port direct current circuit breaker, the working state of the self-energy-taking multi-port direct current circuit breaker is monitored, and the conduction states of each cut-off unit, the through-current branch circuit and the auxiliary branch circuit unit are correspondingly controlled according to the monitoring result, so that the short-circuit current can be quickly transferred and cut off, the cut-off current can reach dozens of kA, and the application requirements of a direct current power transmission and distribution network system are met.
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 other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic block diagram of a specific example of a self-energizing multi-port dc circuit breaker in an embodiment of the invention;
FIG. 2 is a schematic block diagram of a specific example of a disconnect unit in an embodiment of the present invention;
FIG. 3 is a topology of a disconnect unit in an embodiment of the present invention;
FIG. 4(1) - (4) illustrate the current transfer switch topology according to an embodiment of the present invention;
fig. 5(1) - (4) illustrate the auxiliary branch topology according to the embodiment of the present invention;
fig. 6 is a flowchart of a specific example of an application method of the self-energizing multi-port dc circuit breaker according to the embodiment of the present invention;
fig. 7 is a circuit configuration diagram of a specific example of a self-energizing multi-port dc circuit breaker according to an embodiment of the present invention;
FIG. 8 is a diagram illustrating an example of energy extraction from an energy-extracting multi-port DC circuit breaker capacitor according to an embodiment of the present invention;
fig. 9 is a specific schematic diagram of the opening process of the dc short-circuit fault circuit interrupter according to the embodiment of the present invention;
fig. 10 is a specific schematic diagram of the opening process of the dc short-circuit fault circuit interrupter according to the embodiment of the present invention;
fig. 11 is a specific schematic diagram of the opening process of the dc line short-circuit fault circuit interrupter according to the embodiment of the present invention;
fig. 12 is a specific schematic diagram of the opening process of the dc short-circuit fault circuit interrupter according to the embodiment of the present invention;
fig. 13 is a specific schematic diagram of the opening process of the dc short-circuit fault circuit interrupter according to the embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
An embodiment of the present invention provides a self-energy-taking multi-port dc circuit breaker, as shown in fig. 1, including: the system comprises a cut-off branch circuit, a plurality of through-current branch circuits and a plurality of auxiliary branch circuits, wherein each through-current branch circuit is connected in series with a corresponding direct current line, and the direct current lines and the through-current branch circuits are arranged in a one-to-one correspondence manner; the two ends of the cut-off branch are respectively connected with the two ends of the through-flow branch in parallel through an auxiliary branch, and the two ends of the cut-off branch are also respectively connected with the direct-current bus through an auxiliary branch.
In a specific embodiment, as shown in fig. 1, the self-powered multiport dc circuit breaker includes m current branches, m dc lines are led out from a dc bus, each current branch is connected in series to a dc line, and each dc line corresponds to one current branch. The auxiliary branch circuit is divided into an upper auxiliary branch circuit and a lower auxiliary branch circuit according to the current flowing direction, the upper auxiliary branch circuit is used for providing a one-way current conducting path from the polar line (bus) to the cut-off branch circuit, and the lower auxiliary branch circuit is used for providing a one-way circuit conducting path from the cut-off branch circuit to the polar line (bus). Two ends of the cut-off branch are correspondingly connected with two ends of the through-flow branch in parallel through an upper auxiliary branch (1-m) and a lower auxiliary branch (1-m), and in addition, two ends of the cut-off branch are respectively connected with the direct current bus through an upper auxiliary branch (0) and a lower auxiliary branch (0). In the embodiment of the invention, the number of the through-current branches m can be adjusted according to actual needs, and the upper auxiliary branch and the lower auxiliary branch are synchronously adjusted. The self-energy-taking multi-port direct current circuit breaker has a multi-port switching-on and switching-off function, can independently switch on and off short-circuit current of each line, and simultaneously has the capacity of simultaneously switching on and off short-circuit faults of multiple outgoing lines and clearing faults of direct current buses.
In the embodiment of the present invention, as shown in fig. 1, when none of the dc lines (1 to m) has failed, the through-current branch is in a conducting state, which realizes the transmission of the dc load current. When any direct current line has a fault, such as a short-circuit fault, the conducting states of the cut-off branch circuit, the corresponding through-current branch circuit and the corresponding auxiliary branch circuit are switched, so that the mechanical switch of the through-current branch circuit is quenched and reliably cut off. The through-current branch is used for conducting load current when the direct-current system normally operates. The switching-off branch is used for short-time load carrying and switching-off, short-circuit current, switching-off overvoltage limiting and energy absorbing. The auxiliary branch circuit is used for providing a path and voltage isolation between lines for current in the switching-off process.
According to the self-energy-taking multi-port direct current circuit breaker provided by the embodiment, the method of combining the shared main circuit breaker and the auxiliary turn-off of the oscillation current injection is adopted, the using quantity of the full-control devices is saved by more than 70% compared with the using quantity of single hybrid circuit breaker scheme with the same level of parameters and quantity, and the cost of the circuit breaker is greatly reduced. The on-off current of the circuit breaker is not limited by the self-off capacity of a full-control device, the on-off capacity is greatly improved compared with that of a traditional hybrid circuit breaker, and the dual requirements of large-scale direct-current power grid construction on the technical performance and the economical performance of a direct-current circuit breaker are met.
In an embodiment, as shown in fig. 1, the self-energizing multi-port dc circuit breaker further includes: and one end of the grounding branch is connected with the cut-off branch, and the other end of the grounding branch is grounded.
In one embodiment, the grounding branch includes a grounding resistor for providing an energy take (charging) path for the module capacitor before the circuit breaker is put into operation.
In an embodiment, as shown in fig. 2, the disconnection branch comprises at least one disconnection unit. The on-off unit comprises an oscillation branch, an energy consumption branch and an off branch, and the oscillation branch is connected with the energy consumption branch and the off branch in parallel.
In a specific embodiment, the disconnection branch is formed by a cascade of disconnection units, as shown in fig. 2. The breaking unit is formed by connecting three branches in parallel: namely a turn-off branch circuit formed by a full-control device (IGBT/IGCT and the like), and mainly has the main functions of quickly turning off fault current under the assistance of an oscillation branch circuit in the turn-off process and turning off the fault current in the reclosing process; the oscillating branch circuit is composed of a first thyristor unit, a second thyristor unit, an oscillating capacitor C and an oscillating inductor L and mainly used for providing oscillating current opposite to fault current for the switching-off branch circuit to assist the switching-off of the switching-off branch circuit; and an energy-consuming branch consisting of an MOV, which is mainly used for absorbing the switching-off energy and switching-off overvoltage protection.
In the embodiment of the present invention, as shown in fig. 2, the oscillation branch includes: the thyristor comprises an oscillation capacitor C, an oscillation inductor L, a first thyristor unit and a second thyristor unit, wherein one end of the first thyristor unit is respectively connected with one end of the oscillation capacitor C and one end of the second thyristor unit, the other end of the oscillation capacitor C is connected with one end of the oscillation inductor L, and the other end of the oscillation inductor L is connected with the other end of the second thyristor unit.
Specifically, the first thyristor unit and the second thyristor unit each include at least one thyristor. That is, the first thyristor unit and the second thyristor unit may be a cut-off unit submodule formed by a single device as shown in fig. 3, or may be a unit module formed by connecting a plurality of devices in series.
In one embodiment, the current branch includes a mechanical switch and a current transfer switch, and the mechanical switch is connected in series with the current transfer switch.
In a specific embodiment, the current branch is formed by a fast mechanical switch UFD and a current transfer switch CCS connected in series. The current transfer switch can be formed by connecting the current transfer switch units shown in fig. 4(1) -4 (4) in series and in parallel, wherein the switch units can adopt full-control devices such as IGBTs, IGCTs, BIGTs, IEGTs and the like. CCS is used to carry load current and transfer current when switched off.
In one embodiment, the auxiliary branch comprises: a plurality of series connected one-way diode valves; or, a mechanical switch and a plurality of series-connected one-way diode valves; or, unidirectional choke switches and thyristors; or, a plurality of series-connected unidirectional thyristors.
In one embodiment, as shown in fig. 5(1) -5 (4), the auxiliary branch can adopt 4 different schemes. The auxiliary branch of FIG. 5(1) consists of a one-way diode valve; the auxiliary branch of fig. 5(2) consists of a one-way diode valve and a fast mechanical switch connected in series; the auxiliary branch of fig. 5(3) is formed by connecting a unidirectional choke switch UCBS and a thyristor valve in series, wherein the unidirectional choke switch UCBS can be formed by connecting full-control devices in series in a unidirectional manner; the auxiliary branch of fig. 5(4) is constituted by a one-way thyristor valve.
In the embodiment of the present invention, the auxiliary branch is divided into an upper auxiliary branch and a lower auxiliary branch according to the current flowing direction, and the upper auxiliary branch and the lower auxiliary branch may adopt the same topology scheme as in fig. 5(1) -fig. 5(4), or may adopt different topology schemes.
An embodiment of the present invention further provides an application method of a self-energy-extracting multi-port dc circuit breaker, based on the self-energy-extracting multi-port dc circuit breaker, as shown in fig. 6, the application method of the self-energy-extracting multi-port dc circuit breaker includes the following steps:
step S1: and acquiring the working state of the self-energy-taking multi-port direct current circuit breaker.
In one embodiment, the operating state of the self-energizing multiport dc breaker includes a throw-in operation, a line side fault disconnection of the dc breaker, a bus side fault disconnection of the dc breaker, and a reclosing throw-in operation. The working state of the self-energy-taking multi-port direct current circuit breaker can be automatically monitored, and can also be monitored through other equipment.
Step S2: switching the conduction states of the disconnection branch, the corresponding through-current branch and the corresponding auxiliary branch based on the working state.
In one embodiment, the self-energized multi-port dc circuit breaker switches the on-state of the switching unit, the corresponding current branch and the auxiliary branch unit according to different operating states thereof.
According to the application method of the self-energy-taking multi-port direct current circuit breaker, the working state of the self-energy-taking multi-port direct current circuit breaker is monitored, and the conduction states of each cut-off unit, the through-current branch circuit and the auxiliary branch circuit unit are correspondingly controlled according to the monitoring result, so that the short-circuit current can be quickly transferred and cut off, the cut-off current can reach dozens of kA, and the application requirements of a direct current power transmission and distribution network system are met.
In an embodiment, as shown in fig. 7, the CCS in the current branch adopts an IGBT reverse series connection scheme shown in fig. 4(1), the auxiliary branch adopts a diode valve scheme shown in fig. 5(1), and the open branch adopts a two-port circuit breaker of an IGCT-based module cascade scheme shown in fig. 3.
In an embodiment of the present invention, when the self-powered multiport dc breaker is put into operation, the step S2 includes:
step S210: switching on the cut-off branch circuit and controlling the energy taking of the oscillation capacitor in the cut-off branch circuit;
step S212: after the oscillating capacitor is charged, the plurality of through-current branches are conducted, so that current flows through the through-current branches.
Specifically, before the multi-port circuit breaker is put into operation, the oscillation capacitor of the submodule of the switching-off unit needs to be charged, and after charging is completed, the circuit breaker is put into operation. As shown in fig. 8, the inverter forms a charging loop with the oscillating capacitor through the dc pole line and the ground branch, charges the capacitor, and the capacitor of the circuit breaker performs self-energy extraction. The capacitor charging of the circuit breaker is completed by self energy taking, a complex energy supply device is not needed to provide energy for the capacitor, the multi-port circuit breaker is simplified, and the manufacturing cost of the circuit breaker is reduced.
In an embodiment, when at least one dc line of the self-energizing multi-port dc breaker is short-circuited, taking the line side of the self-energizing multi-port dc breaker as an example of a fault, the step S2 includes:
step S220: switching on a full control device in the cut-off branch, locking a current transfer switch in the through-current branch and forcing the current to be transferred to the cut-off branch;
step S221: after the current of the through-flow branch passes zero, a brake separating instruction is issued to a mechanical switch in the through-flow branch, and a second thyristor unit in the on-off branch is conducted at the same time;
step S222: after the mechanical switch in the through-flow branch is in place, a first thyristor unit in the cut-off branch is switched on, the oscillation branch is controlled to inject reverse oscillation current into the full-control device, and the full-control device is cut off when the current flowing through the full-control device is reduced to a cut-off set value;
step S223: controlling the current flowing through the cut-off branch circuit to be transferred to the oscillation branch circuit to charge the capacitor oscillation capacitor;
step S224: when the voltage of the oscillation capacitor reaches a preset protection voltage threshold value, the energy consumption branch circuit is conducted, and the current is transferred to the energy consumption branch circuit to circulate.
In one embodiment, as shown in fig. 9, taking the short-circuit fault of the line 1 as an example, the dc circuit breaker receives a tripping command or an overcurrent protection action, turns on the IGCT in the open branch, and the CCS1 in the current branch 1 is locked to force the current to be transferred to the open branch.
Further, as shown in fig. 10, after the current of the current-passing branch 1 crosses zero, the current flows through the upper auxiliary branch 0, the IGCT in the open branch and the lower auxiliary branch 1, and issues a switching-off command to the UFD1 in the current-passing branch 1, and at the same time, turns on the T2 in the open branch, and the oscillation of the capacitor voltage is reversed. The capacitor voltage changes from positive up to negative down to negative up to positive down.
Further, as shown in fig. 11, after the UFD1 is gated off, the thyristor T1 is turned on, the oscillating capacitor C and the inductor L inject a reverse current into the IGCT, and when the current flowing through the IGCT decreases to a value that allows the IGCT to be turned off, the IGCT is turned off.
Further, as shown in fig. 12, after the IGCT is turned off, the current in the open branch is diverted to the T1-C-L oscillating branch to flow to charge the capacitor C. The charging voltage of the capacitor C rises to the MOV action voltage, the current is transferred to the MOV to circulate, as shown in figure 13, the short-circuit current continuously drops to zero crossing, and the breaker finishes the current breaking.
It should be noted that after the circuit breaker is opened, the circuit breaker can perform a fast reclosing operation according to the requirements of the power grid system, and the reclosing operation process is similar to the closing process, and is not described in detail herein.
When the same-phase multi-pole line fault occurs on the line side of the direct current breaker, namely when a plurality of lines are disconnected due to short circuit faults at the same time, the control method of the direct current breaker is the same as the control principle of the single-pole line fault, and the detailed description is omitted.
The principle of breaking when a fault occurs on the bus side of the direct-current circuit breaker is the same as that of breaking when a fault occurs on the line side, and the difference is that the conducted auxiliary branch is slightly different, so that the detailed description is omitted.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A self-energizing multi-port dc circuit breaker, comprising: a breaking branch, a plurality of through-flow branches, a plurality of auxiliary branches, wherein,
each through-current branch is connected in series with a corresponding direct-current line, and the direct-current lines and the through-current branches are arranged in a one-to-one correspondence manner;
the two ends of the cut-off branch are respectively connected with the two ends of the through-flow branch in parallel through one auxiliary branch, and the two ends of the cut-off branch are also respectively connected with the direct-current bus through one auxiliary branch.
2. The self-energizing multiport DC circuit breaker according to claim 1, characterized in that it further comprises: and one end of the grounding branch is connected with the cut-off branch, and the other end of the grounding branch is grounded.
3. The self-energizing multiport dc circuit breaker according to claim 1, wherein said breaking branch comprises at least one breaking unit comprising an oscillating branch, an energy consuming branch and a turn-off branch, said oscillating branch being connected in parallel with said energy consuming branch and said turn-off branch.
4. The self-energizing multiport DC circuit breaker according to claim 3, characterized in that said oscillating branch comprises: an oscillation capacitor, an oscillation inductor, a first thyristor unit and a second thyristor unit, wherein,
one end of the first thyristor unit is connected with one end of the oscillation capacitor and one end of the second thyristor unit respectively, the other end of the oscillation capacitor is connected with one end of the oscillation inductor, and the other end of the oscillation inductor is connected with the other end of the second thyristor unit.
5. The self-energizing multiport DC circuit breaker according to claim 4, characterized in that said first and second thyristor units each comprise at least one thyristor.
6. The self-energizing multiport dc circuit breaker according to claim 1, characterized in that said through-flow branch comprises a mechanical switch and a current transfer switch, said mechanical switch being connected in series with said current transfer switch.
7. The self-energizing multi-port DC circuit breaker according to claim 1, characterized in that said auxiliary branch comprises:
a plurality of series connected one-way diode valves;
or, a mechanical switch and a plurality of series-connected one-way diode valves;
or, unidirectional choke switches and thyristors;
or, a plurality of series-connected unidirectional thyristors.
8. An application method of a self-energized multiport direct current circuit breaker is characterized in that based on the self-energized multiport direct current circuit breaker of any one of claims 1-7, the application method of the self-energized multiport direct current circuit breaker comprises the following steps:
acquiring the working state of the self-energy-taking multi-port direct current circuit breaker;
and switching the conduction states of the cut-off branch, the corresponding current branch and the corresponding auxiliary branch based on the working state.
9. The method for applying the self-energizing multi-port DC circuit breaker according to claim 8, wherein the switching the conducting states of the open branch, the corresponding current branch and the corresponding auxiliary branch based on the operating state when the self-energizing multi-port DC circuit breaker is put into operation comprises:
switching on the cut-off branch circuit and controlling the energy taking of the oscillation capacitor in the cut-off branch circuit;
and after the charging of the oscillating capacitor is finished, the plurality of through-current branches are conducted so that the current flows through the through-current branches.
10. The method of claim 9, wherein the switching the conducting states of the open branch, the corresponding current branch, and the corresponding auxiliary branch based on the operating state when at least one dc line of the self-energizing multi-port dc circuit breaker has a short-circuit fault comprises:
switching on a full control device in the cut-off branch, locking a current transfer switch in the through-current branch, and forcing current to be transferred to the cut-off branch;
after the current of the through-current branch passes zero, a brake separating instruction is issued to a mechanical switch in the through-current branch, and a second thyristor unit in the cut-off branch is conducted at the same time;
after the mechanical switch in the through-flow branch is in place, a first thyristor unit in the cut-off branch is conducted, the oscillation branch is controlled to inject reverse oscillation current into the full-control device, and the full-control device is cut off when the current flowing through the full-control device is reduced to a cut-off set value;
controlling the current flowing through the cut-off branch circuit to be transferred to the oscillation branch circuit to charge the capacitance oscillation capacitor;
when the voltage of the oscillation capacitor reaches a preset protection voltage threshold value, the energy consumption branch circuit is conducted, and the current is transferred to the energy consumption branch circuit to circulate.
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