CN210201475U - Controllable type multiport direct current circuit breaker of direct current electric wire netting trend - Google Patents
Controllable type multiport direct current circuit breaker of direct current electric wire netting trend Download PDFInfo
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- CN210201475U CN210201475U CN201921308029.0U CN201921308029U CN210201475U CN 210201475 U CN210201475 U CN 210201475U CN 201921308029 U CN201921308029 U CN 201921308029U CN 210201475 U CN210201475 U CN 210201475U
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
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Abstract
The utility model discloses a controllable type multiport direct current circuit breaker of direct current electric wire netting trend. The utility model discloses a direct current breaker includes three direct current buses, J through-current components, K tidal current control components, N isolating switches, 1 current-breaking component, 1 energy dissipation component, 2N +2 diode components and N external ports; one end of the through-current assembly is connected with the first direct current bus, the other end of the through-current assembly is connected with the clamping midpoint of the diode assembly and one end of an isolating switch, and the other end of the isolating switch is used as an external port of the direct current circuit breaker; one end of the cutoff assembly is connected with the second direct current bus, and the other end of the cutoff assembly is connected with the third direct current bus; and one end of the energy consumption assembly is connected with the second direct current bus, and the other end of the energy consumption assembly is connected with the third direct current bus. The utility model discloses two functions of direct current fault isolation and direct current trend control have been combined, have realized the function operation of difference under two kinds of operating modes of system steady state and transient state.
Description
Technical Field
The utility model belongs to direct current electric wire netting field, specifically speaking are controllable type multiport direct current circuit breaker of direct current electric wire netting trend.
Background
The direct current network system has low impedance, and once a fault occurs, a very large short-circuit current can be generated in a short time; meanwhile, the direct current has no natural zero crossing point, and arc extinction is difficult, which brings difficulty to the development of the direct current breaker. In a meshed dc network, the dc network may face power flow control problems. Generally, the power flow control of the dc power grid is realized by regulating the dc voltage of each converter, but in a mesh structure, there may be multiple paths between two dc nodes, so that some dc lines have an overcurrent problem due to uncontrollable power flow.
In order to effectively solve the problem of rapid cut-off of direct current short circuit current, various direct current breaker topologies have been proposed in academia and industry, wherein a hybrid direct current breaker integrates the advantages of a mechanical breaker and a solid-state breaker, has the advantages of small on-state loss, rapid and controllable opening and the like, and is the main direction of research and development of the current high-voltage direct current breaker. However, the transfer branch of the high-voltage hybrid dc circuit breaker needs more power electronic devices, which results in higher cost and limits the engineering application of the hybrid dc circuit breaker to a certain extent.
In addition, various direct current power flow control devices are proposed to solve the power flow control problem of the direct current power grid. The inter-line direct current power flow controller has a high cost performance due to the fact that the number of used devices is small, and is regarded as one of the direct current power flow controllers with the greatest application prospect.
SUMMERY OF THE UTILITY MODEL
Problem to above-mentioned prior art exists, the utility model discloses from solving two big problems of direct current fault isolation and direct current trend control simultaneously, provide a controllable type multiport direct current circuit breaker of direct current electric wire netting trend, under the normal operating conditions, direct current circuit breaker can be used to adjust the direct current trend, after receiving trip signal, can cut off the fault current and keep apart the fault line.
Therefore, the utility model adopts the following technical scheme: a direct current power grid tide controllable type multi-port direct current breaker comprises three direct current buses, J current components, K current control components, N isolating switches, 1 current breaking component, 1 energy consumption component, 2N +2 diode components and N external ports, wherein N corresponds to the number of converters or direct current lines connected with the direct current breaker, J is more than or equal to 0 and less than or equal to N, K is more than or equal to 1 and less than or equal to N/2, and J + K is more than or equal to 1 and less than or equal to N;
one end of the through-current assembly is connected with the first direct current bus, the other end of the through-current assembly is connected with the clamping midpoint of the diode assembly and one end of an isolating switch, and the other end of the isolating switch is used as an external port of the direct current circuit breaker;
the tide flow control assembly is provided with M input ends and M output ends, and M is more than or equal to 2 and less than or equal to N; the first direct current bus is connected with M input ends of the tidal current control assembly, each output end of the tidal current control assembly is connected with a clamping midpoint of the diode assembly and one end of an isolating switch, and the other end of the isolating switch is used as an external port of the direct current breaker;
one end of the cutoff assembly is connected with the second direct current bus, and the other end of the cutoff assembly is connected with the third direct current bus; one end of the energy consumption assembly is connected with the second direct current bus, and the other end of the energy consumption assembly is connected with the third direct current bus;
the second direct current bus is connected with one end of a 2j +1 th diode component, j is more than or equal to 0 and less than or equal to N, the other end of the 2j +1 th diode component is connected with one end of a 2j +2 th diode component, and the other end of the 2j +2 th diode component is connected with a third direct current bus;
the connecting point (diode component clamping midpoint) of the first diode component and the second diode component is connected with the first direct current bus, the connecting point (diode component clamping midpoint) of the 2i +1 th diode component and the 2i +2 th diode component is respectively connected with the branch where the i-th external port is located, and i is more than or equal to 1 and less than or equal to N.
Compared with the prior art, the utility model discloses only need to use less power electronic device to realize two core functions.
As a supplement to the above technical solution, the power flow control assembly has two input terminals and two output terminals, and has an internal structure as follows:
the first input end of the power flow control assembly is connected with the emitting electrode of the first IGBT module, the collecting electrode of the first IGBT module is connected with the collecting electrode of the third IGBT module, the positive electrode of the capacitor C and the collecting electrode of the fifth IGBT module, the emitting electrode of the third IGBT module is connected with the emitting electrode of the seventh IGBT module and the first ultra-fast mechanical switch, and the other end of the first ultra-fast mechanical switch is the first output end of the power flow control assembly; the second input end is connected with a collector of a second IGBT module, an emitter of the second IGBT module is connected with an emitter of a sixth IGBT module, a cathode of a capacitor C and an emitter of a fourth IGBT module, a collector of the sixth IGBT module is connected with a collector of an eighth IGBT module and a second ultra-fast mechanical switch, and the other end of the second ultra-fast mechanical switch is a second output end of the power flow control unit; and the collector of the fourth IGBT module is connected with the collector of the seventh IGBT module, and the emitter of the fifth IGBT module is connected with the emitter of the eighth IGBT module.
As a supplement to the above technical solution, the IGBT module is formed by connecting at least two IGBTs including anti-parallel diodes in series and parallel.
As a supplement to the above technical solution, the current cutoff assembly is formed by cascading a plurality of half-bridge-like sub-modules, each half-bridge-like sub-module includes two ports, an IGBT and its anti-parallel diode, a diode and a capacitor; one port of the half-bridge-like sub-module is connected with the anode of the diode and the collector of the IGBT, the cathode of the diode is connected with one end of the capacitor, and the other end of the capacitor is connected with the emitter of the IGBT and serves as the other end of the half-bridge-like sub-module.
In addition to the above technical solution, the through-current assembly is composed of an ultra-fast mechanical switch and a load transfer switch connected in series.
In addition to the above technical solution, the load transfer switch is formed by connecting at least two IGBTs including anti-parallel diodes in series and parallel.
As a supplement to the technical scheme, the energy consumption assembly is composed of a zinc oxide arrester.
Compared with the prior art, the utility model discloses the beneficial effect who has as follows:
(1) the utility model discloses two functions of direct current fault isolation and direct current trend control have been combined, have realized the function operation of difference under two kinds of operating modes of system steady state and transient state.
(2) Compare with traditional direct current circuit breaker and the detached mode of direct current trend controller, the utility model discloses the device can effectively reduce equipment cost and area.
Drawings
Fig. 1 is a schematic structural diagram of the multi-port dc circuit breaker of the present invention;
FIG. 2 is a schematic structural view of the through-flow assembly of the present invention;
fig. 3 is a schematic view of the shut off assembly of the present invention;
fig. 4 is a schematic structural view of the energy dissipation assembly of the present invention;
fig. 5 is a schematic structural diagram of a diode module according to the present invention;
fig. 6 is a schematic structural diagram of the current control assembly of the present invention.
Detailed Description
To describe the present invention more specifically, the technical solution and the related principles of the present invention will be described in detail below with reference to the accompanying drawings and the detailed description.
A direct-current power grid tide controllable multi-port direct-current circuit breaker comprises three direct-current buses, J current components, K current control components, N isolating switches, 1 current cutoff component, 1 energy consumption component, 2N +2 diode components and N external ports, wherein N corresponds to the number of current converters or direct-current lines connected with the direct-current circuit breaker, J is larger than or equal to 0 and smaller than or equal to N, K is larger than or equal to 1 and smaller than or equal to N/2, and J + K is larger than or equal to 1 and smaller than or equal to N.
As shown in fig. 1, one end of the through-current assembly is connected to the first dc bus, the other end is connected to the clamping midpoint of the diode assembly and one end of a disconnector, and the other end of the disconnector is used as an external port of the dc circuit breaker. The current assembly is formed by connecting an ultra-fast mechanical switch and a load transfer switch in series, as shown in fig. 2. The load transfer switch is formed by connecting at least two IGBTs with anti-parallel diodes in series and parallel.
The current control component has M input ends and M output ends, M is more than or equal to 2 and less than or equal to N, and the figure shows the condition of two inputs and two outputs. The first direct current bus is connected with M input ends of the tidal current control assembly, each output end of the tidal current control assembly is connected with a clamping midpoint of the diode assembly and one end of an isolating switch, and the other end of the isolating switch is used as an external port of the direct current circuit breaker.
The current interruptive assembly is connected at one end to the second dc bus and at the other end to the third dc bus as shown in fig. 3. The current cutoff assembly is formed by cascading a plurality of half-bridge-like sub-modules, and each half-bridge-like sub-module comprises two ports, an IGBT (insulated gate bipolar transistor) and an anti-parallel diode thereof, a diode and a capacitor. One port of the half-bridge-like sub-module is connected with the anode of the diode and the collector of the IGBT, the cathode of the diode is connected with one end of the capacitor, and the other end of the capacitor is connected with the emitter of the IGBT and serves as the other end of the half-bridge-like sub-module.
One end of the energy dissipation assembly is connected with the second direct current bus, and the other end of the energy dissipation assembly is connected with the third direct current bus, as shown in fig. 4, the energy dissipation assembly is composed of a zinc oxide arrester.
The second direct current bus is connected with one end of a 2j +1 (j is more than or equal to 0 and less than or equal to N) th diode component, the other end of the 2j +1 th diode component is connected with one end of a 2j +2 th diode component, and the other end of the 2j +2 th diode component is connected with the third direct current bus. In addition, a connection point (diode assembly clamping midpoint) of the first diode assembly and the second diode assembly is connected with the first direct current bus, and connection points (diode assembly clamping midpoints) of the 2i +1 th diode assembly (i is more than or equal to 1 and less than or equal to N) and the 2i +2 th diode assembly are respectively connected with a branch where the ith external port is located. The diode assembly is constructed of a plurality of diodes connected in series and parallel as shown in fig. 5.
The power flow control assembly has a multi-input-output characteristic, but generally more commonly is a two-input and two-output case, as shown in fig. 6. Because the number of the input ends and the number of the output ends are different, the internal structures of the power flow control assemblies are also different, but the working principles are similar. The present invention is described with reference to two input and two output situations as an example.
First input end A of current control assembly1With the first IGBT module TC1Are connected to each other, a first IGBT module TC1Collector and third IGBT module TC3Collector electrode of (1), positive electrode of capacitor C, and fifth IGBT module TC5Is connected to the collector of the third IGBT module TC3And a seventh IGBT module TC4rEmitter and first ultrafast mechanical switch SK1Connected, a first ultrafast mechanical switch SK1The other end of the first output end B is a first output end B of the moisture control assembly1. Second input terminal A2With a second IGBT module TC2Are connected to the collector of the second IGBT module TC2And a sixth IGBT module TC6Emitter of (2), cathode of capacitor C, and fourth IGBT module TC4Are connected to each other, a sixth IGBT module TC6Collector and eighth IGBT module TC5rCollector and second ultrafast mechanical switch SK2Connected, a second ultra-fast mechanical switch SK2The other end of the first output end B is a second output end B of the power flow control unit2. Fourth IGBT module TC4Collector and seventh IGBT module TC4rAre connected to the collector of the fifth IGBT module TC5And an eighth IGBT module TC5rAre connected. The IGBT module is formed by connecting at least two IGBTs with anti-parallel diodes in series and parallel.
The utility model discloses direct current breaker's control method as follows:
under the normal operation condition, the ultra-fast mechanical switches in the through-flow assembly and the tidal current control assembly are closed, all isolating switches are closed, the load transfer switches in the through-flow assembly are conducted, the tidal current control assembly is in a tidal current control state or a bypass state, the cutoff branch is turned off, and direct current flows through the through-flow assembly and the tidal current control assembly.
The power flow control state is as follows: and the on-off of the eight IGBT modules is adjusted according to the magnitude and the direction of the current flowing through the IGBT modules, so that the direct current power flow control is realized. The seventh and eighth IGBT modules are in a conducting state for a long time, and the remaining six IGBT modules are controlled according to the existing control method.
The bypass state is: the first IGBT module, the third IGBT module, the fifth IGBT module and the eighth IGBT module in the conduction tide control assembly are turned on, and the rest IGBT modules are turned off; or the first IGBT module, the third IGBT module, the fifth IGBT module and the eighth IGBT module in the moisture control assembly are turned off, and the rest IGBT modules are turned on. And in the state, the power flow control assembly does not participate in power flow regulation and control of the direct current system.
After a direct current fault occurs, if a fault line is directly connected with the power flow control assembly, the control time sequence of the direct current breaker is as follows:
1) after the direct current fault is detected and the positioning is finished, all IGBTs in the current-breaking assembly are conducted;
2) according to the fault detection and positioning condition, the power flow control assembly adopts two modes: if the fault line is connected with the first output end of the tidal current control assembly, the second IGBT module and the sixth IGBT module in the tidal current control assembly are switched on, and the rest IGBT modules are switched off; if the fault line is connected with the second output end of the tidal current control assembly, the first IGBT module and the third IGBT module in the tidal current control assembly are conducted, and the rest IGBT modules are turned off;
3) the ultra-fast mechanical switch of the power flow control assembly directly connected with the fault line is switched off;
4) after the ultra-fast mechanical switch is completely disconnected, all IGBTs in the current-disconnecting assembly are switched off, and fault current and energy are discharged through the energy consumption assembly;
5) and when the current flowing through the fault line is zero, disconnecting the corresponding isolating switch to complete physical isolation.
After a direct current fault occurs, if the fault line is not directly connected with the power flow control assembly, the control time sequence of the direct current breaker is as follows:
1) after the direct current fault is detected and the positioning is finished, all IGBTs in the current-breaking assembly are conducted;
2) the tide control assembly is switched to a bypass state, and simultaneously, a load transfer switch in a through-current assembly directly connected with a fault line is turned off;
3) breaking an ultra-fast mechanical switch in a through-current assembly directly connected with a fault line;
4) after the ultra-fast mechanical switch is completely disconnected, all IGBTs in the current-disconnecting assembly are switched off, and fault current and energy are discharged through the energy consumption assembly;
5) when the current flowing through the fault line is zero, the corresponding isolating switch is disconnected to complete physical isolation;
6) the power flow control component is restored to a DC pre-fault state, a power flow control state or a bypass state.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A DC power grid tide controllable type multi-port DC circuit breaker is characterized by comprising three DC buses, J current components, K tide control components, N isolating switches, 1 current breaking component, 1 energy consumption component, 2N +2 diode components and N external ports, wherein N corresponds to the number of current converters or DC lines connected with the DC circuit breaker, J is more than or equal to 0 and less than or equal to N, K is more than or equal to 1 and less than or equal to N/2, and J + K is more than or equal to 1 and less than or equal to N;
one end of the through-current assembly is connected with the first direct current bus, the other end of the through-current assembly is connected with the clamping midpoint of the diode assembly and one end of an isolating switch, and the other end of the isolating switch is used as an external port of the direct current circuit breaker;
the tide flow control assembly is provided with M input ends and M output ends, and M is more than or equal to 2 and less than or equal to N; the first direct current bus is connected with M input ends of the tidal current control assembly, each output end of the tidal current control assembly is connected with a clamping midpoint of the diode assembly and one end of an isolating switch, and the other end of the isolating switch is used as an external port of the direct current breaker;
one end of the cutoff assembly is connected with the second direct current bus, and the other end of the cutoff assembly is connected with the third direct current bus; one end of the energy consumption assembly is connected with the second direct current bus, and the other end of the energy consumption assembly is connected with the third direct current bus;
the second direct current bus is connected with one end of a 2j +1 th diode component, j is more than or equal to 0 and less than or equal to N, the other end of the 2j +1 th diode component is connected with one end of a 2j +2 th diode component, and the other end of the 2j +2 th diode component is connected with a third direct current bus;
the connection point of the first diode component and the second diode component is connected with the first direct current bus, the connection point of the 2i +1 th diode component and the 2i +2 th diode component is respectively connected with the branch where the i-th external port is located, and i is more than or equal to 1 and less than or equal to N.
2. The dc grid power flow controllable multiport dc breaker as claimed in claim 1, wherein said power flow control module has two input terminals and two output terminals, and its internal structure is as follows:
the first input end of the power flow control assembly is connected with the emitting electrode of the first IGBT module, the collecting electrode of the first IGBT module is connected with the collecting electrode of the third IGBT module, the positive electrode of the capacitor C and the collecting electrode of the fifth IGBT module, the emitting electrode of the third IGBT module is connected with the emitting electrode of the seventh IGBT module and the first ultra-fast mechanical switch, and the other end of the first ultra-fast mechanical switch is the first output end of the power flow control assembly; the second input end is connected with a collector of a second IGBT module, an emitter of the second IGBT module is connected with an emitter of a sixth IGBT module, a cathode of a capacitor C and an emitter of a fourth IGBT module, a collector of the sixth IGBT module is connected with a collector of an eighth IGBT module and a second ultra-fast mechanical switch, and the other end of the second ultra-fast mechanical switch is a second output end of the power flow control unit; and the collector of the fourth IGBT module is connected with the collector of the seventh IGBT module, and the emitter of the fifth IGBT module is connected with the emitter of the eighth IGBT module.
3. The direct current grid power flow controllable multiport direct current breaker as recited in claim 2, wherein the IGBT module is formed by connecting at least two IGBTs including anti-parallel diodes in series and parallel.
4. The direct current grid power flow controllable multi-port direct current breaker according to any one of claims 1-3, wherein the current breaking assembly is formed by cascading a plurality of half-bridge-like sub-modules, each half-bridge-like sub-module comprises two ports, an IGBT and an anti-parallel diode thereof, a diode and a capacitor; one port of the half-bridge-like sub-module is connected with the anode of the diode and the collector of the IGBT, the cathode of the diode is connected with one end of the capacitor, and the other end of the capacitor is connected with the emitter of the IGBT and serves as the other end of the half-bridge-like sub-module.
5. A DC network current flow controllable multiport DC breaker according to any of claims 1-3, characterized in that the said current-carrying component is composed of a ultrafast mechanical switch and a load transfer switch connected in series.
6. The direct current grid power flow controllable multiport direct current breaker according to claim 5, wherein the load transfer switch is formed by connecting at least two IGBTs including anti-parallel diodes in series and parallel.
7. A dc grid current flow controllable multiport dc breaker according to any of claims 1-3, characterized in that said dissipating component is constituted by a zinc oxide arrester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921308029.0U CN210201475U (en) | 2019-08-13 | 2019-08-13 | Controllable type multiport direct current circuit breaker of direct current electric wire netting trend |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921308029.0U CN210201475U (en) | 2019-08-13 | 2019-08-13 | Controllable type multiport direct current circuit breaker of direct current electric wire netting trend |
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| CN210201475U true CN210201475U (en) | 2020-03-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110460024A (en) * | 2019-08-13 | 2019-11-15 | 国网浙江省电力有限公司电力科学研究院 | A kind of DC grid trend controllable type multiport dc circuit breaker and its control method |
-
2019
- 2019-08-13 CN CN201921308029.0U patent/CN210201475U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110460024A (en) * | 2019-08-13 | 2019-11-15 | 国网浙江省电力有限公司电力科学研究院 | A kind of DC grid trend controllable type multiport dc circuit breaker and its control method |
| 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 |
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