CN109687405B - Multiport combined type hybrid direct current circuit breaker and control method - Google Patents
Multiport combined type hybrid direct current circuit breaker and control method Download PDFInfo
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- CN109687405B CN109687405B CN201811382881.2A CN201811382881A CN109687405B CN 109687405 B CN109687405 B CN 109687405B CN 201811382881 A CN201811382881 A CN 201811382881A CN 109687405 B CN109687405 B CN 109687405B
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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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- 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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Abstract
The invention provides a multi-port combined type hybrid direct current circuit breaker and a control method, wherein the multi-port combined type hybrid direct current circuit breaker comprises a main current breaking branch, n normal current branch and n fault current branch, wherein n is an integer not less than 1; each normal through-current branch and each fault through-current branch are connected in series to form a group of series-connected branches, and a line port is connected between each group of series-connected branches; the main current-breaking branch circuit is connected with each group of series branch circuits in parallel, a first direct current bus A and a second direct current bus B are arranged at two ends of each parallel circuit respectively, when the circuit breaker is installed at the positive pole of the direct current system, the power electronic switch direction of the fault current-breaking branch circuit points to the second direct current bus B from the first direct current bus A, and when the circuit breaker is installed at the negative pole of the direct current system, the power electronic switch direction of the fault current-breaking branch circuit points to the first direct current bus A from the second direct current bus B. The invention reduces the number and cost of the fully-controlled power electronic devices while realizing the functions of a plurality of circuit breakers.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a multi-port combined type hybrid direct-current circuit breaker and a control method.
Background
The direct current circuit breaker is one of key devices for constructing a flexible direct current power grid, and the direct current circuit breakers for the flexible direct current power grid at present are mainly divided into mechanical direct current circuit breakers based on conventional switches, solid direct current circuit breakers based on pure solid power electronic devices and hybrid direct current circuit breakers based on combination of mechanical switches and power electronic switches. The hybrid direct current circuit breaker has both the through-current capability of the mechanical switch and the current breaking capability of the solid-state switch, so that the hybrid direct current circuit breaker has a wide application prospect. In the study on hybrid dc circuit breakers, in 2012, ABB group announced that it developed the first hybrid high voltage dc circuit breaker in the world. Thereafter, based on the typical hybrid dc circuit breaker topology, various hybrid dc circuit breaker schemes such as a thyristor-based hybrid dc circuit breaker, a module cascade-type hybrid circuit breaker, and the like have been proposed. However, when the single hybrid dc breaker is used to isolate a dc fault, dc breakers need to be installed at the positive and negative poles and both ends of the dc line, and under the background that the scale of the flexible dc power grid is continuously enlarged, the above hybrid dc breaker scheme has the problems of a large number of used dc breakers and an excessively high investment cost.
Therefore, the aim of reducing the number of used power electronic devices while ensuring the rapid cut-off of the direct current fault current is further provided by recombining and uniformly controlling a plurality of direct current breakers connected to the same direct current bus. The circuit breaker mainly comprises a novel combined hybrid direct-current circuit breaker and a multi-terminal hybrid direct-current circuit breaker in the prior art, wherein fig. 1 is a topological diagram of the novel combined hybrid direct-current circuit breaker, and fig. 1 is used for transferring fault currents on a plurality of different lines to the same power electronic cutoff branch for breaking, so that the using number of Insulated Gate Bipolar Transistor (IGBT) components is greatly reduced; fig. 2 is a topological diagram of a multi-terminal hybrid direct current breaker, and referring to fig. 2, the breaker can distribute fault current to different breaking units for breaking, so that energy absorption of a single lightning arrester is reduced, and investment cost of the breaker is reduced. However, in the above prior art, the hybrid dc circuit breaker shown in fig. 1 has a defect in current interruption function due to the fact that the number of used power electronic devices is reduced as much as possible, and has problems of bus failure, sequential failure of multiple lines, and the like; the hybrid dc circuit breaker shown in fig. 2 still uses more main breaker branch devices and is more costly to implement.
Disclosure of Invention
The invention provides a multi-port combined type hybrid direct current circuit breaker and a control method thereof, aiming at overcoming the contradiction between the cost and the function of the existing scheme.
In order to achieve the purpose, the invention adopts the following technical scheme.
An aspect of the present invention provides a multi-port combination type hybrid direct current circuit breaker, including: the main current-cutoff branch circuit, the n normal current branch circuits and the n fault current branch circuits, wherein n is an integer not less than 1.
The fault current branch comprises a fast mechanical switch and a group of power electronic switches, and is used for conducting current in the case of direct current fault.
Each normal through-current branch and each fault through-current branch in the n normal through-current branches and the n fault through-current branches are connected in series to form a group of series-connected branches, the main cutoff branch is connected with each group of series-connected branches in parallel, and a first direct-current bus A and a second direct-current bus B are arranged at two ends of the parallel circuit respectively; when the circuit breaker is installed on the negative pole of the direct current system, the power electronic switch direction of the fault through-current branch circuit points to the first direct current bus A from the second direct current bus B.
Furthermore, the main current breaking branch comprises a bidirectional bridge structure consisting of four diodes and a plurality of current breaking units connected in series, and the current breaking units connected in series are connected in series in a single direction and then bridged between an upper bridge arm and a lower bridge arm of the bidirectional bridge structure;
the main current-breaking branch circuit is used for fault current transfer, disconnection and fault energy absorption during direct current fault.
Further, the normal current branch comprises a fast mechanical switch and a load transfer switch for conducting the current during normal operation of the system.
Furthermore, the current breaking unit comprises a plurality of power electronic switches and an arrester which are connected in series in a single direction, and the plurality of power electronic switches which are connected in series in the single direction are connected with the arrester in parallel.
Further, the load transfer switches are two groups of power electronic switches connected in series in opposite directions.
Further, the power electronic switch comprises an insulated gate bipolar transistor IGBT and a diode, wherein the IGBT and the diode are connected in parallel in the opposite direction.
Further, the peripheral part of the circuit breaker is provided with a bus port for connecting the converter and the first dc bus a and n dc line ports for connecting to a dc line.
Further, each dc line port of the n dc line ports corresponds to a group of serial branches, and each dc line port is connected between serial points of a normal dc branch and a faulty dc branch in the serial branches.
Another aspect of the present invention provides a method for controlling a multi-port combination type hybrid dc circuit breaker, including the steps of:
a) and (3) normal working stage of the direct current power system: the fast mechanical switch of the normal through-current branch is closed and the load transfer switches are all kept on; the power electronic switch in the main current-breaking branch remains latched; the fast mechanical switch of the fault current-passing branch keeps closed, the power electronic switch keeps locked, and the normal current-passing branch conducts load current;
b) when a single line fails: switching on a power electronic switch on the main current-cutoff branch, locking a load transfer switch on a normal current branch corresponding to a fault line port, and disconnecting the quick mechanical switches of the fault current branches corresponding to all non-fault ports, wherein when the current of the normal current branch corresponding to the fault line port passes through zero, the quick mechanical switches of the normal current branches corresponding to the fault line port are disconnected;
when the quick mechanical switch contact of the fault line port corresponding to the normal through-flow branch reaches a rated opening distance, the power electronic switch on the main current-breaking branch is locked, meanwhile, the turn-off overvoltage of the power electronic switch breaks down the lightning arrester connected in parallel with the power electronic switch, and the fault current energy is dissipated through the lightning arrester;
when the fault current is attenuated to zero, opening the quick mechanical switch of the fault current-flowing branch corresponding to the fault port, and closing the quick mechanical switch of the fault current-flowing branch corresponding to the non-fault port;
c) when the direct current bus and the outlet line of the converter have faults: switching on the power electronic switches on the main current-cutoff branch and the power electronic switches on all fault current-cutoff branches, simultaneously locking the load transfer switches on all normal current-cutoff branches, and switching off the quick mechanical switches on the normal current-cutoff branches when the current of the normal current-cutoff branches passes zero;
after the contact of the quick mechanical switch reaches a rated opening distance, a power electronic switch on the main current-breaking branch is locked, and the turn-off overvoltage of the power electronic switch breaks down a lightning arrester connected with the power electronic switch in parallel;
and when the fault current is attenuated to zero, the power electronic switches on all fault current branches are locked, and the quick mechanical switch is switched off.
It can be seen from the above-mentioned multi-port combined hybrid dc circuit breaker and control method of the invention that the invention redesigns and uniformly controls a plurality of hybrid dc circuit breakers connected to the same dc bus, only adopts a unidirectional power electronic switch, and has the same rapid and arc-free breaking capacity when used in combination with a plurality of hybrid dc circuit breakers; the device can cut off different types of faults on a plurality of lines and faults of buses and outlet lines of the converter station, and has various direct current fault current cutting-off capabilities; the functions of a plurality of circuit breakers can be realized, and the use number and cost of full-control power electronic devices are greatly reduced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a topological diagram of a novel combined hybrid dc circuit breaker in the prior art;
fig. 2 is a topological diagram of a multi-terminal hybrid dc circuit breaker in the prior art;
fig. 3 is a topological diagram of a multi-port combination type hybrid dc circuit breaker according to embodiment 1 of the present invention;
fig. 4 is an installation schematic view of a multi-port combination type hybrid dc circuit breaker according to embodiment 2 of the present invention;
fig. 5 is a schematic view of the operating principle of the multi-port combination type hybrid dc circuit breaker according to embodiment 2 of the present invention when operating without a fault;
fig. 6 is a schematic view of the working principle of the multi-port combined hybrid dc circuit breaker according to embodiment 2 of the present invention when a single line fails;
fig. 7 is a schematic diagram of the operating principle of the dc circuit breaker of the multi-port combination type hybrid dc circuit breaker according to embodiment 2 of the present invention when a bus fails.
Description of reference numerals:
FIG. 2:
the IMB is an integrated main circuit breaker, and the ILCS is an integrated current transfer switch;
UFDk-fast mechanical switch for line port k;
LCSk-load transfer switch for line port k;
MBk-main circuit breaker for line port k;
SAk-a lightning arrester corresponding to line port k;
DSk-a residual current disconnect switch corresponding to line port k;
Lcn b k-current limiting reactors for line port k.
FIG. 3:
1 is a normal current branch, 2-1 and 2-2 are fault current branches, and 3 is a main current-cutoff branch;
and 4 is a flow breaking unit.
Fig. 5, 6 and 7:
UFDa,k-a fast mechanical switch on the normal through-current branch k; LCSa,k-a load transfer switch on the normal through-current branch k; UFDb,k-a fast mechanical switch on the faulty current branch k; t isb,k-a power electronic switch on the faulty current branch k; t-power electronic switches on the main cut-off branch; MOA-arrester.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding of the embodiments of the present invention, the following description will be further explained by taking specific embodiments as examples with reference to the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
Example 1
An aspect of an embodiment of the present invention provides a multi-port combination type hybrid dc circuit breaker, fig. 3 is a topological diagram of the multi-port combination type hybrid dc circuit breaker according to the embodiment of the present invention, and referring to fig. 3, the multi-port combination type hybrid dc circuit breaker includes: the main current-cutoff branch circuit, the n normal current branch circuits and the n fault current branch circuits, wherein n is an integer not less than 1.
The fault current-passing branch comprises a quick mechanical switch and a group of power electronic switches, and is used for conducting current in the case of direct-current fault;
each normal through-current branch and each fault through-current branch in the n normal through-current branches and the n fault through-current branches are connected in series to form a group of series-connected branches, the main cutoff branch is connected with each group of series-connected branches in parallel, and a first direct-current bus A and a second direct-current bus B are arranged at two ends of the parallel circuit respectively;
when the circuit breaker is installed on the negative pole of the direct current system, the power electronic switch direction of the fault through-current branch circuit points to the first direct current bus A from the second direct current bus B.
Preferably, the main current breaking branch comprises a bidirectional bridge structure composed of four diodes and a plurality of current breaking units (as shown in fig. 1) connected in series, and the plurality of current breaking units connected in series are connected in series in a single direction and then bridged between an upper bridge arm and a lower bridge arm of the bidirectional bridge structure; the main current-breaking branch circuit is used for fault current transfer, disconnection and fault energy absorption during direct current fault.
The normal through-current branch comprises a quick mechanical switch and a load transfer switch, and is used for conducting current during normal operation of the system.
Preferably, the current breaking unit comprises a plurality of power electronic switches and an arrester which are connected in series in a single direction, and the plurality of power electronic switches which are connected in series in a single direction are connected with the arrester in parallel.
Preferably, the load transfer switches are two sets of power electronic switches connected in series in opposite directions.
Preferably, the power electronic switch comprises an Insulated Gate Bipolar Transistor (IGBT) and a diode, and the IGBT and the diode are connected in parallel in opposite directions.
Further, the peripheral part of the circuit breaker is provided with a bus port for connecting the converter, as shown in fig. 3, and n dc line ports for connecting to the dc lines, while the bus port is connected to the first dc bus a.
Each direct-current line port in the n direct-current line ports corresponds to one group of serial branches, and each direct-current line port is connected between serial points of a normal through-current branch and a fault through-current branch in the serial branches.
Another aspect of the present invention provides a method for controlling a multi-port combination type hybrid dc circuit breaker, including the steps of:
a) and (3) normal working stage of the direct current power system: the fast mechanical switch of the normal through-current branch is closed and the load transfer switches are all kept on; the power electronic switch in the main current-breaking branch remains latched; the quick mechanical switch of the fault current-flowing branch keeps closed, the power electronic switch keeps locked, and load current is conducted;
b) when a single line fails: switching on a power electronic switch on the main current-cutoff branch, locking a load transfer switch on a normal current branch corresponding to a fault line port, and disconnecting the fast mechanical switches of the fault current branches corresponding to all non-fault ports, and disconnecting the fast mechanical switches of the normal current branches corresponding to the fault ports when the current of the normal current branches corresponding to the fault ports passes through zero;
when a quick mechanical switch contact of a normal through-current branch corresponding to a fault port reaches a rated opening distance, a power electronic switch on the main current-breaking branch is locked, meanwhile, the turn-off overvoltage of the power electronic switch breaks down a lightning arrester connected in parallel with the power electronic switch, and fault current energy is dissipated through the lightning arrester;
when the fault current is attenuated to zero, opening the quick mechanical switch of the fault current-flowing branch corresponding to the fault port, and closing the quick mechanical switch of the fault current-flowing branch corresponding to the non-fault port;
c) when the direct current bus and the outlet line of the converter have faults: switching on the power electronic switches on the main current-cutoff branch and the power electronic switches on all fault current-cutoff branches, simultaneously locking the load transfer switches on all normal current-cutoff branches, and switching off the quick mechanical switches on the normal current-cutoff branches when the current of the normal current-cutoff branches passes zero;
after the contact of the quick mechanical switch reaches a rated opening distance, a power electronic switch on the main current-breaking branch is locked, and the turn-off overvoltage of the power electronic switch breaks down a lightning arrester connected with the power electronic switch in parallel;
and when the fault current is attenuated to zero, the power electronic switches on all fault current branches are locked, and the quick mechanical switch is switched off.
Example 2
Fig. 4 is a schematic installation diagram of a multi-port combination type hybrid dc circuit breaker, and a control method of the multi-port combination type hybrid dc circuit breaker in different types of faults is described with reference to the installation manner and the faults of the circuit breaker shown in fig. 4. Wherein, fault F1 represents line 1 positive fault, fault F2 represents positive bus fault, and F3 represents converter outlet line fault. The fault F2 in this example is equivalent to a first dc bus a (shown in fig. 3) fault inside the circuit breaker. In addition, for the sake of clear description of the working principle of the circuit breaker in normal operation, it is assumed herein that protection can correctly send an action signal to the circuit breaker in the event of a line fault and a bus fault.
a) Normal working stage of DC power system
When the system has no fault, the fast mechanical switch of the normal through-flow branch is closed and the load transfer switches are all kept on; the power electronic switch in the main current-breaking branch remains latched; and the fast mechanical switch of the fault current branch is kept closed so as to rapidly carry out commutation in case of fault, and the power electronic switch in the fault current branch is kept locked. At this time, the working current flows only through the normal through-current branch, and fig. 5 is a schematic diagram of the working principle of the multi-port combination type hybrid dc circuit breaker in the fault-free operation.
b) When single line fault occurs
Taking the example of the fault F1 occurring in the line 1 in fig. 4, when a single line has a fault, the control method of the multi-port combined type hybrid dc circuit breaker includes 4 stages of fault detection, fault current transfer, fault energy dissipation and fault line isolation, and fig. 6 is a schematic diagram of the working principle of the multi-port combined type hybrid dc circuit breaker when the single line has a fault.
(1) And (3) a fault current detection stage: this phase includes the occurrence of a fault to protection detection and then the issuance of a breaker action command to the protection. In this stage, the circuit breaker still maintains the system in a fault-free operating state, and the fault current flows through the normal current branch corresponding to the line port 1. Since the load transfer switch adopts an inverted series structure, bidirectional flow of current can be supported, as shown in fig. 6 (a).
(2) A fault current transfer stage: as shown in fig. 6(b), after the circuit breaker receives the opening command of the line port 1, the power electronic switch T on the main current-breaking branch is turned on immediately in the first step; the second step of locking the load transfer switch LCS on the normal through-current branch corresponding to the port 1 of the linea,1(ii) a Thirdly, breaking all fault current-through branches corresponding to non-fault ports through a fast mechanical switch UFDb,2(ii) a And finally, when the current of the normal through-current branch passes through zero, the fast mechanical switch UFD for breaking the normal through-current brancha,1。
Due to UFDa,1Switching off, the impedance of normal current branch is increased continuously, so that the fault current is transferred to main current-breaking branch, and the quick mechanical switch UFD on the fault current branch corresponding to the non-fault line port 2 is switched offb,2In order to withstand an overvoltage when the current is switched off. In this stage, since the main current-interrupting branch adopts a bidirectional bridge structure, the current of the main current-interrupting branch portion also supports bidirectional flow.
(3) And (3) a fault energy dissipation stage: in order to avoid reignition of the switching arc of the mechanical quick switch under overvoltage, it is necessary to wait for the mechanical quick switch contact to reach the rated opening distance after the fault current is diverted to the main current-interrupting branch. When the contact of the fast mechanical switch reaches the rated opening distance, the power electronic switch on the main current-breaking branch is locked, meanwhile, the turn-off overvoltage of the power electronic switch breaks down the arrester MOA connected in parallel with the power electronic switch, and finally, the fault current energy is dissipated through the arrester, as shown in fig. 6 (c).
(4) And (3) fault line isolation stage: when the fault current is attenuated to zero, the quick mechanical switch of the fault current branch corresponding to the fault port is opened, and the quick mechanical switch UFD of the fault current branch corresponding to the non-fault port is closedb,2As shown in fig. 6 (d). Of circuit breakersThe other ports return to the system fault-free operating state.
c) DC bus and converter outlet line fault
The control method of the multi-port combined type hybrid direct current circuit breaker still comprises the four stages when the bus and the converter outlet line have faults, for example, the faults F2 and F3 in fig. 4 illustrate the control method of the bus and the converter station outlet line faults, and fig. 7 is a schematic diagram of the working principle of the multi-port combined type hybrid direct current circuit breaker when the bus has faults, as shown in fig. 7.
(1) And (3) a fault current detection stage: as shown in fig. 7(a), due to a bus failure, the non-failed line port 1 and line port 2 inject a fault current through the normal current branch to the bus port.
(2) A fault current transfer stage: as shown in fig. 7(b), when the protection detects a bus fault, a command is sent to the circuit breaker to open all lines connected to the bus. Immediate on-state of power electronic switches on main current-cutoff branches and power electronic switches T on all faulty current-cutoff branchesb,1、Tb,2Simultaneously latching the load transfer switches LCS on all the normal through-current branchesa,1、LCSa,2(ii) a When the normal current branch circuit current passes through zero, the quick mechanical switch UFD is switched offa,1、UFDa,2The fault current is diverted to the primary current cutoff branch.
(3) And (3) a fault energy dissipation stage: after the contact of the fast mechanical switch reaches the rated opening distance, the power electronic switch on the main current-breaking branch is locked, the turn-off overvoltage of the power electronic switch breaks down the arrester MOA connected in parallel with the power electronic switch, and finally the fault current energy is dissipated through the arrester, as shown in fig. 7 (c).
(4) And (3) fault line isolation stage: when the fault current is attenuated to zero, the power electronic switches T on all fault current branches are lockedb,1、Tb,2Quick mechanical switch UFDb,1、UFDb,2As shown in fig. 7 (d).
When the breaker is installed on the negative pole, when the negative pole direct current line is in fault and the negative pole bus is in fault, fault current flows from a fault point to a fault-free line, and the action time sequence of the negative pole breaker is the same as that of the positive pole line and the positive pole bus.
d) Multiple DC line sequential fault
When a plurality of lines have faults in sequence, the first fault line is isolated according to the sequence of the faults. If the other lines have a fault after the circuit breaker is isolated and not recovered yet, the second line with the fault is cut off by a single direct current circuit breaker connected at the outlet of the converter station.
The faults of a plurality of lines belong to the faults of 'small probability and large influence', although all lines connected with the converter station at the side can be cut off by the scheme, the scheme can protect the converter and the circuit breaker from being damaged under the condition of serious faults, and therefore, the scheme has certain practical value.
In practical applications, the above-mentioned components may also be arranged at other positions inside the circuit breaker. Embodiments of the present invention are not limited to the specific placement of the components, and any placement of the components within the interior of the circuit breaker is within the scope of the embodiments of the present invention.
The specific process of performing fault handling by using the apparatus of the embodiment of the present invention is similar to that of the foregoing method embodiment, and is not described herein again.
In summary, in the multi-port combined hybrid dc circuit breaker according to the embodiment of the present invention, the main current breaking branch only needs to be connected in series with a single-phase IGBT to realize bidirectional, arc-free, and fast breaking of fault current; the device has various direct current fault current breaking capacities; when a line has a fault, a power electronic switch on a fault through-flow branch does not need to be switched on or off, and only when a bus has a fault, the bus needs to be controlled; the fault current of many circuits can be disconnected with the branch road of same main cutout, under the more condition of line number, can reduce power electronic device's in the circuit breaker use number greatly, reduces use cost.
Those of ordinary skill in the art will understand that: the drawings are merely schematic representations of one embodiment, and the elements or components shown in the drawings are not necessarily required to practice the present invention.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A multi-port combination hybrid dc circuit breaker, comprising: the main current-cutoff branch circuit, the n normal current-cutoff branch circuits and the n fault current-cutoff branch circuits, wherein n is an integer not less than 1;
the fault current branch comprises a quick mechanical switch and a group of power electronic switches, and is used for conducting current in direct-current fault;
the main cutoff branch is connected with each group of series branches in parallel, and two ends of the parallel circuit are respectively a first direct current bus A and a second direct current bus B; when the circuit breaker is installed on the negative pole of the direct current system, the power electronic switch direction of the fault through-current branch circuit points to the first direct current bus A from the second direct current bus B;
the normal through-current branch comprises a quick mechanical switch and a load transfer switch and is used for conducting current when the system normally runs;
the load transfer switches are two groups of power electronic switches which are connected in series in opposite directions;
the main current breaking branch comprises a bidirectional bridge structure consisting of four diodes and a plurality of current breaking units connected in series, and the current breaking units connected in series are connected in series in a single direction and then bridged between an upper bridge arm and a lower bridge arm of the bidirectional bridge structure;
the main current-breaking branch circuit is used for fault current transfer, disconnection and fault energy absorption during direct current fault.
2. The multi-port combination hybrid dc circuit breaker of claim 1, wherein said interrupting unit comprises a plurality of unidirectional series connected power electronic switches and an arrester, said plurality of unidirectional series connected power electronic switches being connected in parallel to said arrester.
3. The multi-port combination hybrid direct current circuit breaker according to any one of claims 1-2, wherein said power electronic switch comprises insulated gate bipolar transistors, IGBTs, and diodes, said IGBTs and diodes being connected in reverse direction in parallel.
4. The multi-port combination type hybrid dc circuit breaker according to claim 1, wherein the peripheral portion of the circuit breaker is provided with a bus bar port for connecting the inverter and the first dc bus a and n dc line ports for connecting to dc lines.
5. The multi-port combination hybrid dc circuit breaker of claim 4, wherein each of the n dc line ports corresponds to a group of series branches, and each dc line port is connected between series points of a normal current branch and a fault current branch of the series branches.
6. A control method of the multi-port combination type hybrid direct current circuit breaker of any one of claims 1 to 5, comprising the steps of:
a) and (3) normal working stage of the direct current power system: the fast mechanical switch of the normal through-current branch is closed and the load transfer switches are all kept on; the power electronic switch in the main current-breaking branch remains latched; the fast mechanical switch of the fault current-passing branch keeps closed, the power electronic switch keeps locked, and the normal current-passing branch conducts load current;
b) when a single line fails: switching on a power electronic switch on the main current-cutoff branch, locking a load transfer switch on a normal current branch corresponding to a fault line port, and disconnecting the quick mechanical switches of the fault current branches corresponding to all non-fault ports, wherein when the current of the normal current branch corresponding to the fault line port passes through zero, the quick mechanical switches of the normal current branches corresponding to the fault line port are disconnected;
when the quick mechanical switch contact of the fault line port corresponding to the normal through-flow branch reaches a rated opening distance, the power electronic switch on the main current-breaking branch is locked, meanwhile, the turn-off overvoltage of the power electronic switch breaks down the lightning arrester connected in parallel with the power electronic switch, and the fault current energy is dissipated through the lightning arrester;
when the fault current is attenuated to zero, opening the quick mechanical switch of the fault current-flowing branch corresponding to the fault port, and closing the quick mechanical switch of the fault current-flowing branch corresponding to the non-fault port;
c) when the direct current bus and the converter outlet are in fault: switching on the power electronic switches on the main current-cutoff branch and the power electronic switches on all fault current-cutoff branches, simultaneously locking the load transfer switches on all normal current-cutoff branches, and switching off the quick mechanical switches on the normal current-cutoff branches when the current of the normal current-cutoff branches passes zero;
after the contact of the quick mechanical switch reaches a rated opening distance, a power electronic switch on the main current-breaking branch is locked, and the turn-off overvoltage of the power electronic switch breaks down a lightning arrester connected with the power electronic switch in parallel;
and when the fault current is attenuated to zero, the power electronic switches on all fault current branches are locked, and the quick mechanical switch is switched off.
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| CN110460024B (en) * | 2019-08-13 | 2024-05-10 | 国网浙江省电力有限公司电力科学研究院 | DC power grid power flow controllable type multi-port DC circuit breaker and control method thereof |
| CN111509663A (en) * | 2020-04-10 | 2020-08-07 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Diode bridge type multi-port hybrid direct current breaker and control method thereof |
| CN111509682B (en) * | 2020-05-18 | 2022-05-27 | 广东电网有限责任公司东莞供电局 | Hybrid direct current circuit breaker sharing main through-current branch and protection device and method thereof |
| CN113809724B (en) * | 2020-06-15 | 2023-10-20 | 许继集团有限公司 | Main branch electronic switch protection method and device for hybrid high-voltage direct-current breaker |
| CN112952983B (en) * | 2021-02-22 | 2023-01-20 | 广东电网有限责任公司 | Power supply switching circuit and control method thereof |
| CN113852051B (en) * | 2021-09-13 | 2022-05-10 | 中国科学院电工研究所 | Direct-current solid-state circuit breaker with bidirectional switching-on and switching-off and soft starting functions and control method |
| CN114172135B (en) * | 2021-12-15 | 2023-10-27 | 天津大学 | Double-main-break type multi-port hybrid direct current breaker applicable to multi-port direct current power grid |
| CN114597874A (en) * | 2022-02-08 | 2022-06-07 | 中国长江三峡集团有限公司 | Hybrid multiport circuit breaker based on branch transfer multiplexing and control method |
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| CN103972875B (en) * | 2013-01-31 | 2016-07-06 | 南京南瑞继保电气有限公司 | Limit line current or make device and the control method thereof of electric current disjunction |
| CN103972855B (en) * | 2013-01-31 | 2016-12-28 | 南京南瑞继保电气有限公司 | A kind of device making circuit bidirectional current disjunction and control method thereof |
| CN105990827B (en) * | 2015-01-30 | 2018-12-21 | 南京南瑞继保电气有限公司 | A kind of high voltage direct current open circuit topological circuit and implementation method |
| CN105703324A (en) * | 2016-03-18 | 2016-06-22 | 国网浙江省电力公司电力科学研究院 | Current transfer type high-voltage direct-current circuit breaker |
| CN107645154B (en) * | 2016-07-20 | 2020-03-06 | 全球能源互联网研究院有限公司 | Novel combined direct current circuit breaker and application method thereof |
| CN107666140B (en) * | 2017-09-01 | 2019-03-26 | 天津大学 | A kind of combined DC breaker and its control method with multiple terminals |
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