CN114336550B - Self-energy-taking multi-port direct current 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 following components: the device comprises an opening branch, a plurality of through-flow branches and a plurality of auxiliary branches, wherein each through-flow branch is connected in series in a corresponding direct-current circuit, and the direct-current circuits and the through-flow branches are arranged in one-to-one correspondence; the two ends of the breaking branch are respectively connected in parallel with the two ends of the through-flow branch through an auxiliary branch, and the two ends of the breaking branch are also respectively connected with the direct-current bus through an auxiliary branch. Compared with the method of combining the main breaker and the auxiliary switching-off of oscillation current injection, the method has the advantages that the using quantity of the full-control devices of the scheme of the single hybrid breaker with the same grade parameters and quantity is saved by more than 70%, and the cost of the breaker is greatly reduced. The breaking current is not limited by the self-breaking capacity of the full-control device, the breaking capacity is greatly improved compared with that of the traditional hybrid breaker, and the technical and economical dual requirements of large-scale direct current power grid construction on the direct current breaker are met.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a self-energy-taking multiport direct current breaker and an application method thereof.
Background
The current DC 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 high-voltage DC circuit breaker is key equipment for the more economic and flexible network development of DC power transmission and distribution.
With the development of high-voltage high-capacity direct current power grids, the use quantity of the circuit breakers is increased, and the requirements for switching on and off the capacity of the circuit breakers are improved, so that the power grids have higher requirements on the technology and economy of the high-voltage direct current circuit breakers. The hybrid direct current circuit breaker adopts the mixed connection of a mechanical switch and a power electronic device, and is a main technical route in the field of the high-voltage direct current circuit breaker at present. The breaking capacity of the hybrid breaker is limited by the inherent breaking current capacity of the full-control device, the breaking capacity is difficult to further increase, meanwhile, the breaker is high in manufacturing cost due to the fact that a large number of power electronic and mechanical switches are adopted, and the technical and economical dual requirements of large-scale direct current power grid construction on the direct current breaker are difficult to meet, so that the large-scale application of the high-voltage direct current breaker in the multi-terminal and 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 breaker in the prior art is difficult to meet the dual requirements of the technical and the economical efficiency, thereby providing the self-energy-taking multi-port direct current breaker and the application method.
In order to achieve the above purpose, the present invention provides the following technical solutions:
in a first aspect, an embodiment of the present invention provides a self-powered multiport dc breaker, including: an opening branch, a plurality of through-flow branches and a plurality of auxiliary branches, wherein,
Each through-flow branch is connected in series in a corresponding direct-current circuit, and the direct-current circuits and the through-flow branches are arranged in one-to-one correspondence;
The two ends of the breaking branch are respectively connected in parallel with the two ends of the through-flow branch through an auxiliary branch, and the two ends of the breaking branch are respectively connected with the direct-current bus through an auxiliary branch.
Preferably, the self-powered multiport dc breaker further comprises: and one end of the grounding branch is connected with the breaking branch, and the other end of the grounding branch is grounded.
Preferably, the breaking branch comprises at least one breaking unit, the breaking unit comprises an oscillation branch, an energy consumption branch and a shut-off branch, and the oscillation branch is connected with the energy consumption branch and the shut-off branch in parallel.
Preferably, the oscillating branch comprises: an oscillation capacitor, an oscillation inductance, a first thyristor unit and a second thyristor unit, wherein,
One end of the first thyristor unit is connected with one end of the oscillating capacitor and one end of the second thyristor unit respectively, the other end of the oscillating capacitor is connected with one end of the oscillating inductor, and the other end of the oscillating inductor is connected with the other end of the second thyristor unit.
Preferably, the first thyristor unit and the second thyristor unit each comprise at least one thyristor.
Preferably, the current-through branch comprises a mechanical switch and a current transfer switch, the mechanical switch being connected in series with the current transfer switch.
Preferably, the auxiliary branch comprises:
a plurality of unidirectional diode valves connected in series;
or, a mechanical switch and a plurality of unidirectional diode valves connected in series;
Or, unidirectional choke switch and thyristor;
Or, a plurality of unidirectional thyristors connected in series.
In a second aspect, an embodiment of the present invention provides an application method of a self-energy-taking multi-port dc breaker, based on the self-energy-taking multi-port dc breaker in the first aspect, the application method of the self-energy-taking multi-port dc breaker includes:
Acquiring the working state of the self-energy-taking multi-port direct current breaker;
And switching the on-off branch, the corresponding through-flow branch and the corresponding auxiliary branch based on the working state.
Preferably, when the self-powered multiport dc breaker is put into operation, the switching the on states of the open branch, the corresponding through-current branch, and the corresponding auxiliary branch based on the operating state includes:
Switching on the switching-off branch circuit, and controlling the oscillating capacitor in the switching-off branch circuit to take energy;
and after the oscillating capacitor is charged, a plurality of through-current branches are conducted so that current flows through the through-current branches.
Preferably, when at least one dc line of the self-powered multiport dc breaker fails in a short circuit, the switching the on state 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 breaking branch, locking a current transfer switch in the through-flow branch, and forcing current to be transferred to the breaking branch;
After the current of the through-flow branch passes zero, a gate opening instruction is issued to a mechanical switch in the through-flow branch, and a second thyristor unit in the breaking branch is conducted at the same time;
after a mechanical switch in the through-flow branch is switched on in place, a first thyristor unit in the switching-off branch is conducted, the oscillating branch is controlled to inject reverse oscillating current into the full-control device, and when the current flowing through the full-control device is reduced to a switching-off set value, the full-control device is switched off;
Controlling the current flowing through the switching-off branch to be transferred to the oscillation branch to charge a capacitance oscillation capacitor;
When the voltage of the oscillating capacitor reaches a preset protection voltage threshold, the energy-consuming branch circuit is conducted, and the current is transferred to the energy-consuming branch circuit for circulation.
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 using quantity of the full-control devices of the scheme of the single hybrid breaker with the same grade parameters and quantity is saved by more than 70% by a method of combining the common main breaker and the auxiliary switching-off of the oscillation current injection, and the cost of the breaker is greatly reduced. The breaking current is not limited by the self-breaking capacity of the full-control device, the breaking capacity is greatly improved compared with that of the traditional hybrid breaker, and the technical and economical dual requirements of large-scale direct current power grid construction on the direct current breaker are met.
According to the application method of the self-energy-taking multi-port direct current breaker, the working state of the self-energy-taking multi-port direct current breaker is monitored, and the conducting states of each breaking unit, the through-flow branch and the auxiliary branch unit are correspondingly controlled according to the monitoring result, so that the quick transfer and breaking of short-circuit current can be realized, the breaking current can reach tens of kA, and the application requirement of a direct current transmission and distribution networking system is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of one specific example of a self-powered multiport DC breaker in accordance with an embodiment of the invention;
FIG. 2 is a schematic block diagram of one specific example of a disconnect unit in an embodiment of the invention;
FIG. 3 is a schematic diagram of a switching unit topology according to an embodiment of the present invention;
FIGS. 4 (1) - (4) are current transfer switch topologies in embodiments of the present invention;
FIGS. 5 (1) - (4) illustrate auxiliary branch topologies in embodiments of the present invention;
fig. 6 is a flowchart of a specific example of an application method of the self-powered multiport dc breaker in an embodiment of the present invention;
Fig. 7 is a circuit configuration diagram of a specific example of a self-powered multiport dc breaker in accordance with an embodiment of the present invention;
FIG. 8 is a diagram of an example of capacitive sampling of a self-powered multiport DC breaker in accordance with an embodiment of the present invention;
Fig. 9 is a schematic diagram of a dc link short-circuit fault circuit interrupter switching process according to an embodiment of the invention;
FIG. 10 is a schematic diagram showing an exemplary process for opening a DC link short-circuit fault circuit interrupter in accordance with an embodiment of the present invention;
FIG. 11 is a schematic diagram showing a process for opening a DC line short-circuit fault circuit interrupter in accordance with an embodiment of the invention;
FIG. 12 is a schematic diagram showing a process for opening a DC link short-circuit fault circuit interrupter in accordance with an embodiment of the invention;
Fig. 13 is a schematic diagram of a dc link short-circuit fault circuit interrupter according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific 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 explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
An embodiment of the present invention provides a self-powered multiport dc breaker, as shown in fig. 1, including: the device comprises an opening branch, a plurality of through-flow branches and a plurality of auxiliary branches, wherein each through-flow branch is connected in series in a corresponding direct-current circuit, and the direct-current circuits and the through-flow branches are arranged in one-to-one correspondence; the two ends of the breaking branch are respectively connected in parallel with the two ends of the through-flow branch through an auxiliary branch, and the two ends of the breaking 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-energy-taking multi-port dc breaker includes m dc branches, where the dc buses draw out m dc lines in total, each dc branch is connected in series to a dc line, and each dc line corresponds to one dc branch. The auxiliary branch is divided into an upper auxiliary branch and a lower auxiliary branch according to the current flow direction, the upper auxiliary branch is used for providing a unidirectional current conduction path from the polar line (bus) to the breaking branch, and the lower auxiliary branch is used for providing a unidirectional circuit conduction path from the breaking branch to the polar line (bus). The two ends of the breaking branch are correspondingly connected in parallel with the two ends of the through-flow branch through the upper auxiliary branch (1-m) and the lower auxiliary branch (1-m), and in addition, the two ends of the breaking branch are respectively connected with the direct-current bus through the upper auxiliary branch (0) and the lower auxiliary branch (0). In the embodiment of the invention, the number of the through-flow branches m can be adjusted according to actual needs, and the upper auxiliary branch and the lower auxiliary branch can be synchronously adjusted. The self-energy-taking multi-port direct current breaker has a multi-port breaking function, can independently break short-circuit current of each line, and simultaneously has the capacity of breaking and clearing direct current bus faults at the same time of multi-outlet short-circuit faults.
In the embodiment of the present invention, as shown in fig. 1, when no fault occurs in any of the dc lines (1 to m), the through-current branch is in a conductive state, so as to realize transmission of dc load current. When any direct current circuit fails, for example, when a short circuit fails, the conduction states of the open-circuit branch, the corresponding through-flow branch and the corresponding auxiliary branch are switched, so that the mechanical switch of the through-flow branch is reliably turned off. The through-current branch is used for conducting load current when the direct-current system normally operates. The open-circuit branch is used for carrying and opening loads and short-circuit currents for a short time, and limiting open-circuit overvoltage and absorbing energy. The auxiliary branch is used to provide a path for current and voltage isolation between the lines during the opening process.
The self-energy-taking multi-port direct current breaker provided by the embodiment has the advantages that compared with the single hybrid breaker scheme, the total control device using quantity of the same-level parameters and quantity is saved by more than 70% by a method of combining the common main breaker and the oscillation current injection auxiliary switching-off, and the cost of the breaker is greatly reduced. The breaking current is not limited by the self-breaking capacity of the full-control device, the breaking capacity is greatly improved compared with that of the traditional hybrid breaker, and the technical and economical dual requirements of large-scale direct current power grid construction on the direct current breaker are met.
In one embodiment, as shown in fig. 1, the self-powered multiport dc breaker further comprises: and one end of the grounding branch is connected with the breaking branch, and the other end of the grounding branch is grounded.
In one embodiment, the ground path includes a ground resistor for providing an energy (charging) path for the module capacitance before the circuit breaker is put into operation.
In an embodiment, as shown in fig. 2, the breaking branch comprises at least one breaking unit. The switching-off unit comprises an oscillation branch, an energy consumption branch and a switching-off branch, wherein the oscillation branch is connected with the energy consumption branch and the switching-off branch in parallel.
In a specific embodiment, the breaking branch is formed by a cascade of breaking units, as shown in fig. 2. The breaking unit is specifically formed by connecting three branches in parallel: the turn-off branch circuit composed of full control devices (IGBT/IGCT, etc.) is mainly used for rapidly turning off fault current with the assistance of an oscillation branch circuit in the turn-off process and turning off fault current in the reclosing process; the oscillating branch circuit consists of a first thyristor unit, a second thyristor unit, an oscillating capacitor C and an oscillating inductor L and is mainly used for providing an oscillating current opposite to a fault current for the turn-off branch circuit to assist the turn-off of the turn-off branch circuit; and the energy consumption branch circuit formed by MOV is mainly used for absorbing breaking energy and protecting breaking overvoltage.
In an embodiment of the present invention, as shown in fig. 2, the oscillation branch includes: the device comprises an oscillation capacitor C, an oscillation inductance 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 inductance L, and the other end of the oscillation inductance 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 an on-off unit sub-module composed of a single device as shown in fig. 3, or may be a unit module composed of a plurality of devices connected in series.
In one embodiment, the current branch comprises a mechanical switch and a current transfer switch, the mechanical switch being connected in series with the current transfer switch.
In one embodiment, the current branch is formed by series connection of a fast mechanical switch UFD and a current transfer switch CCS. The current transfer switch can be formed by connecting current transfer switch units shown in fig. 4 (1) -4 (4) in series and parallel, wherein the switch units can adopt IGBT, IGCT, BIGT, IEGT and other fully-controlled devices. CCS is used to carry load current and transfer current when turned off.
In one embodiment, the auxiliary branch comprises: a plurality of unidirectional diode valves connected in series; or, a mechanical switch and a plurality of unidirectional diode valves connected in series; or, unidirectional choke switch and thyristor; or, a plurality of unidirectional thyristors connected in series.
In one embodiment, as shown in fig. 5 (1) -5 (4), the auxiliary branch may take 4 different schemes. The auxiliary branch of fig. 5 (1) consists of a unidirectional diode valve; the auxiliary branch of fig. 5 (2) is composed of a unidirectional diode valve and a quick mechanical switch which are 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 one direction, etc.; the auxiliary branch of fig. 5 (4) is constituted by a unidirectional thyristor valve.
In the embodiment of the invention, the auxiliary branch is divided into an upper auxiliary branch and a lower auxiliary branch according to the current flow direction, and the upper auxiliary branch and the lower auxiliary branch can adopt the same topology scheme in fig. 5 (1) -5 (4) or can adopt different topology schemes.
The embodiment of the invention also provides an application method of the self-energy-taking multi-port direct current breaker, which is based on the self-energy-taking multi-port direct current breaker, as shown in fig. 6, and comprises the following steps:
step S1: the working state of the self-energy-taking multi-port direct current breaker is obtained.
In one embodiment, the operating state of the self-powered multiport dc breaker includes on-operation, dc breaker line side fault open, dc breaker bus side fault open, reclose on-operation, and the like. The working state of the self-energy-taking multi-port direct current breaker can be automatically monitored or monitored by other equipment.
Step S2: and switching the on-state of the switching-off branch, the corresponding through-current branch and the corresponding auxiliary branch based on the working state.
In a specific embodiment, the self-powered multiport dc breaker switches the on states of the breaking unit, the corresponding through-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 breaker, the working states of the self-energy-taking multi-port direct current breaker are monitored, and the conducting states of each breaking unit, the through-flow branch and the auxiliary branch unit are correspondingly controlled according to the monitoring results, so that the quick transfer and breaking of short-circuit current can be realized, the breaking current can reach tens of kA, and the application requirements of a direct current transmission and distribution networking system are met.
In an embodiment, as shown in fig. 7, the CCS in the through-flow branch adopts the IGBT anti-series scheme shown in fig. 4 (1), the auxiliary branch adopts the diode valve scheme shown in fig. 5 (1), and the open branch adopts the two-port circuit breaker based on the IGCT module cascading scheme shown in fig. 3.
In the 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 switching-off branch circuit, and controlling the oscillating capacitor in the switching-off branch circuit to take energy;
Step S212: after the oscillating capacitor is charged, a plurality of through-current branches are conducted so that current flows through the through-current branches.
Specifically, the multi-port circuit breaker needs to complete the energy taking (charging) of the oscillating capacitor of the sub-module of the breaking unit before the multi-port circuit breaker is put into operation, and the circuit breaker is put into operation after the charging is completed. As shown in fig. 8, the converter forms a charging loop with the oscillating capacitor through the dc line and the ground branch, charges the capacitor, and completes self-energy-taking of the breaker capacitor. The capacitor of the circuit breaker is charged by self-energy taking, a complex energy supply device is not needed to supply energy to the capacitor, the multiport 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-powered multiport dc breaker fails due to a short circuit, taking a line side failure of the self-powered multiport dc breaker as an example, the step S2 includes:
Step S220: switching on a full-control device in the switching-off branch, locking a current transfer switch in the current-passing branch, and forcing current to be transferred to the switching-off branch;
step S221: after the current of the through-flow branch passes zero, a gate opening instruction is issued to a mechanical switch in the through-flow branch, and a second thyristor unit in the switching-off branch is conducted at the same time;
Step S222: after the mechanical switch in the through-flow branch is switched on in place, a first thyristor unit in the switching-off branch is switched on, the oscillating branch is controlled to inject reverse oscillating current into the full-control device, and when the current flowing through the full-control device is reduced to a switching-off set value, the full-control device is switched off;
Step S223: controlling the current flowing through the open-circuit branch to be transferred to the oscillation branch to charge the capacitance oscillation capacitor;
step S224: when the voltage of the oscillating capacitor reaches a preset protection voltage threshold, the energy-consuming branch circuit is conducted, and the current is transferred to the energy-consuming branch circuit for circulation.
In a specific embodiment, as shown in fig. 9, taking a short-circuit fault of the line 1 as an example, the direct current breaker receives a breaking command or an overcurrent protection action, turns on the IGCT in the breaking branch, and locks the CCS1 in the breaking branch, so as to force the current to be transferred to the breaking branch.
Further, as shown in fig. 10, after the current of the through-flow branch 1 crosses zero, the current flows through the upper auxiliary branch 0, IGCT in the breaking branch and the lower auxiliary branch 1, and issues a breaking instruction to the UFD1 in the through-flow branch 1, and at the same time, the T2 in the breaking branch is turned on, so that the capacitor voltage oscillation is reversed. At this time, the capacitance voltage is changed from positive to negative from top to bottom.
Further, as shown in fig. 11, after UFD1 is opened in place, thyristor T1 is turned on, oscillating capacitor C and inductor L inject reverse current into IGCT, and IGCT is turned off when the current flowing through IGCT decreases to the allowable turn-off setting value.
Further, as shown in FIG. 12, after the IGCT is turned off, current in the turn-off branch is transferred to the T1-C-L oscillating branch for circulation to charge the capacitor C. The capacitor C charge voltage rises to the MOV operating voltage and the current is transferred to the MOV for circulation, as shown in fig. 13, the short circuit current continues to drop to zero crossing and the circuit breaker completes the current break.
It should be noted that, after the breaker is opened, the quick reclosing operation can be performed according to the requirement of the power grid system, and the reclosing operation process is similar to the closing process and will not be described in detail here.
When a synchronous multipolar line fault occurs on the line side of the direct current breaker, that is, when a plurality of line short-circuit faults occur at the same time, the control method is the same as the control principle of a monopolar line fault, and the details are not described here.
The principle of breaking when the bus side of the direct current breaker breaks down is the same as that of breaking when the line side breaks down, except that the auxiliary branch that is conducted is slightly different, and will not be described in detail here.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (8)
1. The application method of the self-energy-taking multi-port direct current breaker is characterized by comprising the following steps of:
Acquiring the working state of the self-energy-taking multi-port direct current breaker;
switching on states of the switching-off branch, the corresponding through-flow branch and the corresponding auxiliary branch based on the working state;
when the self-energy-taking multi-port direct current breaker is put into operation, the switching on state of the switching-off branch, the corresponding through current branch and the corresponding auxiliary branch based on the working state comprises the following steps:
Switching on the switching-off branch circuit, and controlling the oscillating capacitor in the switching-off branch circuit to take energy;
after the oscillating capacitor is charged, a plurality of through-current branches are conducted so that current flows through the through-current branches;
When at least one direct current line of the self-energy-taking multi-port direct current circuit breaker has a short circuit fault, the switching on state of the switching-off branch, the corresponding through current branch and the corresponding auxiliary branch based on the working state comprises the following steps:
switching on a full control device in the breaking branch, locking a current transfer switch in the through-flow branch, and forcing current to be transferred to the breaking branch;
After the current of the through-flow branch passes zero, a gate opening instruction is issued to a mechanical switch in the through-flow branch, and a second thyristor unit in the breaking branch is conducted at the same time;
after a mechanical switch in the through-flow branch is switched on in place, a first thyristor unit in the switching-off branch is conducted, the oscillating branch is controlled to inject reverse oscillating current into the full-control device, and when the current flowing through the full-control device is reduced to a switching-off set value, the full-control device is switched off;
Controlling the current flowing through the switching-off branch to be transferred to the oscillation branch to charge a capacitance oscillation capacitor;
When the voltage of the oscillating capacitor reaches a preset protection voltage threshold, the energy-consuming branch circuit is conducted, and the current is transferred to the energy-consuming branch circuit for circulation.
2. The method of claim 1, wherein the self-powered multiport dc breaker comprises: an opening branch, a plurality of through-flow branches and a plurality of auxiliary branches, wherein,
Each through-flow branch is connected in series in a corresponding direct-current circuit, and the direct-current circuits and the through-flow branches are arranged in one-to-one correspondence;
The two ends of the breaking branch are respectively connected in parallel with the two ends of the through-flow branch through an auxiliary branch, and the two ends of the breaking branch are respectively connected with the direct-current bus through an auxiliary branch.
3. The method of claim 2, further comprising: and one end of the grounding branch is connected with the breaking branch, and the other end of the grounding branch is grounded.
4. The method of claim 2, wherein the breaking branch comprises at least one breaking unit, the breaking unit comprises an oscillating branch, an energy dissipating branch and a shut-off branch, and the oscillating branch is connected in parallel with the energy dissipating branch and the shut-off branch.
5. The method of claim 4, wherein the oscillating branch comprises: an oscillation capacitor, an oscillation inductance, a first thyristor unit and a second thyristor unit, wherein,
One end of the first thyristor unit is connected with one end of the oscillating capacitor and one end of the second thyristor unit respectively, the other end of the oscillating capacitor is connected with one end of the oscillating inductor, and the other end of the oscillating inductor is connected with the other end of the second thyristor unit.
6. The method of claim 5, wherein the first thyristor unit and the second thyristor unit each comprise at least one thyristor.
7. The method of claim 2, wherein the current branch comprises a mechanical switch and a current transfer switch, the mechanical switch being connected in series with the current transfer switch.
8. The method of claim 2, wherein the auxiliary branch comprises:
a plurality of unidirectional diode valves connected in series;
or, a mechanical switch and a plurality of unidirectional diode valves connected in series;
Or, unidirectional choke switch and thyristor;
Or, a plurality of unidirectional thyristors connected in series.
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| CN107834506A (en) * | 2017-11-08 | 2018-03-23 | 全球能源互联网研究院有限公司 | A kind of hybrid dc circuit breaker |
| CN214314555U (en) * | 2021-03-05 | 2021-09-28 | 全球能源互联网研究院有限公司 | Multiport direct current breaker |
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| KR101550374B1 (en) * | 2013-12-31 | 2015-09-04 | 주식회사 효성 | High-voltage DC circuit breaker |
| CN107769179A (en) * | 2016-08-23 | 2018-03-06 | 全球能源互联网研究院 | It is a kind of based on can shut-off valve force electric current transfevent blended learning |
| CN111224383A (en) * | 2018-11-26 | 2020-06-02 | 平高集团有限公司 | Direct current breaker with rapid reclosing function |
| CN112886555B (en) * | 2021-03-03 | 2023-02-10 | 广东电网有限责任公司 | Integrated direct-current circuit breaker, direct-current transmission line and fault removing method |
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| CN107834506A (en) * | 2017-11-08 | 2018-03-23 | 全球能源互联网研究院有限公司 | A kind of hybrid dc circuit breaker |
| CN214314555U (en) * | 2021-03-05 | 2021-09-28 | 全球能源互联网研究院有限公司 | Multiport direct current breaker |
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