CN114498546A - Hybrid dual-bridge type direct current breaker topological circuit and control method thereof - Google Patents
Hybrid dual-bridge type direct current breaker topological circuit and control method thereof Download PDFInfo
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- CN114498546A CN114498546A CN202111630412.XA CN202111630412A CN114498546A CN 114498546 A CN114498546 A CN 114498546A CN 202111630412 A CN202111630412 A CN 202111630412A CN 114498546 A CN114498546 A CN 114498546A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/021—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order
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Abstract
The invention is suitable for the field of circuit breakers, and provides a hybrid dual-bridge type direct current circuit breaker topological circuit and a control method thereof. The main through-current branch comprises a quick mechanical switch K, the transfer branch consists of a dual-bridge module and an oscillation branch, and a plurality of IGCTs and capacitors C1 form a first heavy-bridge structure, which can also be called an inner bridge; the outer bridge is composed of a plurality of solid-state switches, the double-bridge module is connected with the oscillation branch in parallel, and the oscillation branch is composed of a capacitor C2 and a solid-state switch group K3. The voltage limiting branch is made up of a plurality of voltage limiting MOVs. The hybrid dual-bridge type direct current breaker topological circuit has the advantages of bidirectional through-current capacity, low requirements on the turn-off capacity of devices, small number of required devices, low cost, small size and the like.
Description
Technical Field
The invention belongs to the field of circuit breakers, and particularly relates to a hybrid dual-bridge type direct current circuit breaker topological circuit and a control method thereof.
Background
The mechanical direct current circuit breaker can cut off very large current, has the advantages of low cost, small loss and the like, and has a slow breaking speed. Solid state dc circuit breakers are fast switching speeds but have high associated losses and are expensive. In order to overcome the disadvantages of the two, a hybrid direct current circuit breaker is formed by integrating a mechanical direct current circuit breaker and a solid state direct current circuit breaker on one device. The hybrid direct current circuit breaker combines the good static characteristic of a mechanical switch and the good dynamic performance of a power electronic device, conducts normal running current by using a quick mechanical switch, and breaks short-circuit current by using a solid power electronic device, and has the advantages of small on-state loss, short on-off time, no need of special cooling equipment and the like.
In order to meet the requirement of the hybrid direct current circuit breaker on the quick breaking capacity in the using process, higher requirements on the performance of electronic devices are required, so that the conventional hybrid direct current circuit breaker is large in number of devices, large in size and high in cost.
Disclosure of Invention
In order to solve the above problems, on one hand, the invention discloses a hybrid dual-bridge type direct current breaker topological circuit, which comprises a main through-current branch, a transfer branch and a voltage limiting branch, wherein the transfer branch and the voltage limiting branch are connected in parallel with the main through-current branch;
the transfer branch comprises a dual bridge module and an oscillation branch; the double-bridge module comprises an inner bridge, an outer bridge and a capacitor C1, wherein the capacitor C1, the inner bridge and the outer bridge are sequentially arranged layer by layer from inside to outside.
Further, the main through-flow branch comprises a fast mechanical switch K.
Further, the inner bridge comprises an IGCT1, an IGCT2, an IGCT3 and an IGCT4, wherein the IGCT1 and the IGCT4 are connected in series in the same direction to form a first branch of the inner bridge; the IGCT2 and the IGCT3 are connected in series in the same direction to form a second branch of the inner bridge; the first branch of the inner bridge and the second branch of the inner bridge are connected in parallel in the same direction.
Further, the cathode of the IGCT1 in the first branch of the inner bridge is connected to the anode of the IGCT 4; the cathode of the IGCT2 in the second leg of the inner bridge is connected to the anode of the IGCT 3.
Further, one end of the capacitor C1 is connected to the cathode of the IGCT1 and the anode of the IGCT4, and the other end of the capacitor C1 is connected to the cathode of the IGCT2 and the anode of the IGCT 3; and a voltage limiting MOV3 is further arranged inside the inner bridge, the voltage limiting MOV3 is connected with the capacitor C1 in parallel, and two ends of the voltage limiting MOV3 are connected with two ends of the capacitor C1.
Further, the external bridge comprises two solid-state switches K1 and two solid-state switches K2, wherein one solid-state switch K1 and one solid-state switch K2 are connected in series in an opposite direction to form a first branch of the external bridge; the other solid-state switch K1 and the other solid-state switch K2 are connected in series in an opposite direction to form an outer bridge second branch circuit; the outer bridge first branch and the outer bridge second branch are connected in parallel.
Further, in the first branch of the external bridge, the cathode of the solid-state switch K1 is connected to the cathode of the solid-state switch K2, and in the second branch of the external bridge, the anode of the solid-state switch K1 is connected to the anode of the solid-state switch K2; in the outer bridge, the anode of a solid-state switch K1 in a first branch of the outer bridge is connected with the cathode of a solid-state switch K2 in a second branch of the outer bridge, the connection point is marked as a first connection point of the outer bridge, and the first connection point is connected with one end of a rapid mechanical switch K, one end of an oscillation branch and one end of a voltage limiting branch; the anode of the solid-state switch K2 in the first branch of the outer bridge is connected with the cathode of the solid-state switch K1 in the second branch of the outer bridge, the connection point is marked as a second connection point of the outer bridge, and the second connection point is connected with the other end of the rapid mechanical switch K, the other end of the oscillation branch and the other end of the voltage limiting branch.
Further, the anode of the IGCT1 in the first branch of the inner bridge is connected to the anode of the IGCT2 in the second branch of the inner bridge, and the connection point is denoted as a first connection point of the inner bridge; the cathode of the IGCT4 in the first branch of the inner bridge is connected with the cathode of the IGCT3 in the second branch of the inner bridge, and the connection point is marked as a second connection point of the inner bridge; the first connecting point of the inner bridge is connected with the cathode of a solid-state switch K1 and the cathode of a solid-state switch K2 in the first branch of the outer bridge; the second connecting point of the inner bridge is connected with the anode of the solid-state switch K1 and the anode of the solid-state switch K2 in the second branch of the outer bridge.
Further, the oscillation branch comprises a capacitor C2 and a solid-state switch group K3 which are connected in series, one end of the capacitor C2 is connected with one end of the solid-state switch group K3, the other end of the capacitor C2 is connected with the first connection point of the external bridge, and the other end of the solid-state switch group K3 is connected with the second connection point of the external bridge.
Further, the solid-state switch group K3 includes two anti-parallel solid-state switches.
Further, the voltage limiting branch comprises a voltage limiting MOV1 and a voltage limiting MOV2 which are connected in series, one end of the voltage limiting MOV1 is connected with one end of the voltage limiting MOV2, the other end of the voltage limiting MOV1 is connected with the first connection point of the outer bridge, and the other end of the voltage limiting MOV2 is connected with the second connection point of the outer bridge.
Furthermore, the connection point of one end of the voltage-limiting MOV1 and one end of the voltage-limiting MOV2 is marked as an oscillation branch connection point, the connection point of one end of the capacitor C2 and one end of the solid-state switch group K3 is marked as a voltage-limiting branch connection point, and the oscillation branch connection point is connected with the voltage-limiting branch connection point.
Furthermore, each solid-state switch K1, each solid-state switch K2 and the solid-state switch group K3 are all configured with a voltage-limiting MOV of a corresponding voltage level in parallel connection with the solid-state switches.
Further, the solid state switch K2 includes fully-controlled power electronics and half-controlled power electronics; the solid state switch K1 comprises fully controlled power electronics; the solid state switch bank K3 includes fully-controlled power electronics and half-controlled power electronics.
On the other hand, the invention also discloses a control method of the hybrid dual bridge type direct current breaker topological circuit, which comprises the following steps:
after a short-circuit fault occurs, the system sends a brake opening instruction to the quick mechanical switch, and the quick mechanical switch K starts to act;
when the contact of the quick mechanical switch K is separated by a designated gap, the solid-state switch K1 on the outer bridge arm, and the IGCTs 1 and IGCTs 3 in the inner bridge are switched on;
a capacitor C1 is precharged with voltage to commutate current from the main current branch to the transfer branch;
with the surge of the fault current, the voltage on the capacitor C1 quickly drops to 0 and charges in the reverse direction;
when the voltage on the capacitor C1 reaches a specified amplitude, an IGCT2 in the inner bridge is switched on;
the current is converted into the IGCT2 from the IGCT1 by using the voltage of the capacitor C1, at the moment, a certain voltage exists in the capacitor 1, and the fault current completely flows through the bridge arms on the same side of the inner bridge, namely the IGCT2 and the IGCT 3;
after the current conversion is finished, the IGCT is switched off 1;
when the distance of the rapid mechanical switch K reaches the distance which can resist the overvoltage, the IGCT4 is conducted;
the voltage on the capacitor C1 is used for converting the current in the inner bridge lower tube, and the current is converted from the IGCT3 to the IGCT 4;
the IGCT3 is turned off, and the fault current charges the capacitor C1, so that the polarity of the voltage of the capacitor C1 changes;
when the voltage on the capacitor C1 reaches a specified amplitude, the solid-state switch 3 is switched on;
the voltage on the capacitor C1 is used for converting the current to the oscillation branch;
when the current of the branch circuit drops to 0, the solid-state switch K1, the IGCT2 and the IGCT4 are turned off;
when the voltage on the capacitor C2 reaches the action of the voltage-limiting MOV1, the MOV1 absorbs the energy in the system, and the current of the transfer branch is reduced to 0, and the solid-state switch K1 and the solid-state switch K2 are both in the on-off state, thereby completing the on-off.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a hybrid dual-bridge type direct current breaker topological circuit. The main through-current branch comprises a quick mechanical switch K, the transfer branch consists of a dual-bridge module and an oscillation branch, and a plurality of IGCTs and capacitors C1 form a first heavy-bridge structure, which can also be called an inner bridge; the outer bridge is composed of a plurality of solid-state switches, the double-bridge module is connected with the oscillation branch in parallel, and the oscillation branch is composed of a capacitor C2 and a solid-state switch group K3. The voltage limiting branch is made up of a plurality of voltage limiting MOVs. The hybrid dual-bridge type direct current breaker topological circuit has the advantages of bidirectional through-current capacity, low requirements on the turn-off capacity of devices, small number of required devices, low cost, small size and the like.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 illustrates a hybrid dual bridge dc circuit breaker topology according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In an embodiment of the present invention, as shown in fig. 1, a hybrid dual-bridge dc circuit breaker topology circuit according to an embodiment of the present invention includes a main through-current branch, a transfer branch, and a voltage limiting branch, where the transfer branch and the voltage limiting branch are connected in parallel with the main through-current branch; the transfer branch comprises a dual bridge module and an oscillation branch; the double-bridge module comprises an inner bridge, an outer bridge and a capacitor C1, wherein the capacitor C1, the inner bridge and the outer bridge are sequentially arranged layer by layer from inside to outside. The main through-flow branch comprises a fast mechanical switch K.
In one aspect of this embodiment, the inner bridge includes an IGCT1 (integrated gate commutated thyristor), an IGCT2, an IGCT3, and an IGCT4, where the IGCT1 and the IGCT4 are connected in series in the same direction to form a first branch of the inner bridge; the IGCT2 and the IGCT3 are connected in series in the same direction to form a second branch of the inner bridge; the first branch of the inner bridge and the second branch of the inner bridge are connected in parallel in the same direction. The cathode of the IGCT1 in the first branch of the inner bridge is connected with the anode of the IGCT 4; the cathode of the IGCT2 in the second leg of the inner bridge is connected to the anode of the IGCT 3.
In one aspect of this embodiment, one end of the capacitor C1 is connected to the cathode of the IGCT1 and the anode of the IGCT4, and the other end of the capacitor C1 is connected to the cathode of the IGCT2 and the anode of the IGCT 3; the inner bridge is also internally provided with a voltage limiting MOV3(Metal Oxide Varistors), the voltage limiting MOV3 is connected with the capacitor C1 in parallel, and two ends of the voltage limiting MOV3 are connected with two ends of the capacitor C1.
In one aspect of this embodiment, the external bridge includes two solid state switches K1 and two solid state switches K2, one of the solid state switches K1 and one of the solid state switches K2 connected in series in opposite directions to form a first branch of the external bridge; the other solid-state switch K1 and the other solid-state switch K2 are connected in series in an opposite direction to form an outer bridge second branch circuit; the outer bridge first branch and the outer bridge second branch are connected in parallel. In the first branch of the external bridge, the cathode of the solid-state switch K1 is connected with the cathode of the solid-state switch K2, and in the second branch of the external bridge, the anode of the solid-state switch K1 is connected with the anode of the solid-state switch K2; in the outer bridge, the anode of a solid-state switch K1 in a first branch of the outer bridge is connected with the cathode of a solid-state switch K2 in a second branch of the outer bridge, the connection point is marked as a first connection point of the outer bridge, and the first connection point is connected with one end of a rapid mechanical switch K, one end of an oscillation branch and one end of a voltage limiting branch; the anode of the solid-state switch K2 in the first branch of the outer bridge is connected with the cathode of the solid-state switch K1 in the second branch of the outer bridge, the connection point is marked as a second connection point of the outer bridge, and the second connection point is connected with the other end of the rapid mechanical switch K, the other end of the oscillation branch and the other end of the voltage limiting branch.
In one aspect of this embodiment, the anode of the IGCT1 in the first branch of the inner bridge is connected to the anode of the IGCT2 in the second branch of the inner bridge, and the connection point is referred to as the first connection point of the inner bridge; the cathode of the IGCT4 in the first branch of the inner bridge is connected with the cathode of the IGCT3 in the second branch of the inner bridge, and the connection point is marked as a second connection point of the inner bridge; the first connecting point of the inner bridge is connected with the cathode of a solid-state switch K1 and the cathode of a solid-state switch K2 in the first branch of the outer bridge; the second connecting point of the inner bridge is connected with the anode of the solid-state switch K1 and the anode of the solid-state switch K2 in the second branch of the outer bridge.
In one embodiment of the present invention, the oscillation branch comprises a capacitor C2 and a solid-state switch group K3 connected in series, one end of the capacitor C2 is connected to one end of the solid-state switch group K3, the other end of the capacitor C2 is connected to the first connection point of the external bridge, and the other end of the solid-state switch group K3 is connected to the second connection point of the external bridge.
In one aspect of this embodiment, the bank of solid state switches K3 includes two antiparallel solid state switches.
In one aspect of this embodiment, the solid state switch K2 includes fully-controlled power electronics and half-controlled power electronics; the solid state switch K1 comprises fully controlled power electronics; the solid-state switch group K3 comprises a full-control power electronic device and a half-control power electronic device
In one embodiment of the invention, the voltage limiting branch comprises a voltage limiting MOV1 and a voltage limiting MOV2 which are connected in series, one end of the voltage limiting MOV1 is connected with one end of the voltage limiting MOV2, the other end of the voltage limiting MOV1 is connected with the first connection point of the outer bridge, and the other end of the voltage limiting MOV2 is connected with the second connection point of the outer bridge.
The invention provides a hybrid dual-bridge type direct current breaker topological circuit and a control method thereof. The main through-current branch comprises a quick mechanical switch K, the transfer branch consists of a dual-bridge module and an oscillation branch, and a plurality of IGCTs and capacitors C1 form a first heavy-bridge structure, which can also be called an inner bridge; the outer bridge is composed of a plurality of solid-state switches, the double-bridge module is connected with the oscillation branch in parallel, and the oscillation branch is composed of a capacitor C2 and a solid-state switch group K3. The voltage-limiting branch is composed of a plurality of voltage-limiting MOVs, and each solid-state switch K1, each solid-state switch K2 and the solid-state switch group K3 are all required to be configured with the voltage-limiting MOV with the corresponding voltage level in parallel connection with the solid-state switch, so that the component devices of the solid-state switches are prevented from overvoltage breakdown. The hybrid dual-bridge type direct current breaker topological circuit has the advantages of bidirectional through-current capacity, low requirements on the turn-off capacity of devices, small number of required devices, low cost, small size and the like.
The working control method of the hybrid double-bridge type direct current breaker topological circuit comprises the following steps: after a short-circuit fault occurs, the system sends a brake opening instruction to the quick mechanical switch K, and the quick mechanical switch K starts to act. When the contacts of the quick mechanical switch K are separated by a certain gap, the solid-state switch K1 on the outer bridge arm, the IGCT1 in the inner bridge and the IGCT3 are conducted, and the current is converted from the main through-current branch to the transfer branch by using the pre-charging voltage in the capacitor C1. With the surge of the fault current, the voltage on the capacitor C1 quickly drops to 0 and charges in reverse. When the voltage of the capacitor C1 reaches a certain amplitude, the IGCT2 of the inner bridge arm is turned on, and the voltage of the capacitor C1 is used to commutate the current from the IGCT1 to the IGCT 2. At this time, a certain voltage is present in the capacitor C1, and the fault current flows completely through the bridge arm on the same side of the inner bridge, i.e., the IGCT2 and the IGCT 3. After commutation is complete, the IGCT1 is turned off. When the distance between the fast mechanical switches K is sufficient to withstand the overvoltage, the IGCT4 is turned on, the down tube current is commutated with the voltage on the capacitor C1, the current commutates from the IGCT3 to the IGCT4, the IGCT3 is turned off, and the fault current charges the capacitor C1, so that the polarity of the voltage on the capacitor C changes. When the voltage of the capacitor C1 reaches a certain amplitude, the solid-state switch K3 is turned on, the voltage of the capacitor C1 is used for converting the current to the oscillation branch, and when the current of the transfer branch is reduced to 0, the solid-state switches K1, the IGCT2 and the IGCT4 are turned off. When the voltage on the capacitor C2 reaches the action of the voltage-limiting MOV1, the voltage-limiting MOV1 absorbs the energy in the system, and the current of the transfer branch is reduced to 0, and the solid-state switch K1 and the solid-state switch K2 are both in an open state. The disconnection is completed. It should be noted that the solid-state switch K1 and the solid-state switch K2 are provided to achieve the bidirectional switching function, and the above-mentioned steps related to the solid-state switch K1 in the working process may be replaced by controlling the solid-state switch K2 to perform corresponding operations, so as to achieve the same commutation purpose. The double-bridge module can naturally meet the requirement of bidirectional current flowing, and bidirectional current flowing is realized under the condition that the precharge performance of the capacitor C1 is not changed.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (15)
1. A hybrid dual bridge type direct current breaker topological circuit comprises a main through-current branch, and is characterized by further comprising a transfer branch and a voltage limiting branch, wherein the transfer branch and the voltage limiting branch are connected with the main through-current branch in parallel;
the transfer branch comprises a dual bridge module and an oscillation branch; the dual-bridge module comprises an inner bridge, an outer bridge and a capacitor C1, wherein the capacitor C1, the inner bridge and the outer bridge are sequentially arranged layer by layer from inside to outside.
2. The hybrid dual bridge dc breaker topology circuit of claim 1, wherein the main current branch comprises a fast mechanical switch K.
3. The hybrid dual bridge dc breaker topology circuit of claim 1, wherein said inner bridge comprises IGCT1, IGCT2, IGCT3 and IGCT4, said IGCT1 and IGCT4 being connected in series in the same direction forming a first branch of the inner bridge; the IGCT2 and the IGCT3 are connected in series in the same direction to form a second branch of the inner bridge; the first branch of the inner bridge and the second branch of the inner bridge are connected in parallel in the same direction.
4. The hybrid dual bridge dc breaker topology of claim 3, wherein the cathode of the IGCT1 in the first leg of the inner bridge is connected to the anode of the IGCT 4; the cathode of the IGCT2 in the second leg of the inner bridge is connected to the anode of the IGCT 3.
5. The hybrid dual-bridge direct current breaker topology circuit according to claim 3, wherein one end of the capacitor C1 is connected to the cathode of IGCT1 and the anode of IGCT4, and the other end of the capacitor C1 is connected to the cathode of IGCT2 and the anode of IGCT 3; and a voltage limiting MOV3 is further arranged inside the inner bridge, the voltage limiting MOV3 is connected with the capacitor C1 in parallel, and two ends of the voltage limiting MOV3 are connected with two ends of the capacitor C1.
6. The hybrid dual bridge dc breaker topology of any of claims 3-5, wherein the outer bridge comprises two solid state switches K1 and two solid state switches K2, wherein one of the solid state switches K1 and one of the solid state switches K2 are connected in series in reverse to form a first branch of the outer bridge; the other solid-state switch K1 and the other solid-state switch K2 are reversely connected in series to form an outer bridge second branch circuit; the outer bridge first branch and the outer bridge second branch are connected in parallel.
7. The hybrid dual bridge dc breaker topology of claim 6, wherein in said first leg of the external bridge a cathode of solid state switch K1 is connected to a cathode of solid state switch K2, and in said second leg of the external bridge an anode of solid state switch K1 is connected to an anode of solid state switch K2; in the outer bridge, the anode of a solid-state switch K1 in a first branch of the outer bridge is connected with the cathode of a solid-state switch K2 in a second branch of the outer bridge, the connection point is marked as a first connection point of the outer bridge, and the first connection point is connected with one end of a rapid mechanical switch K, one end of an oscillation branch and one end of a voltage limiting branch; the anode of the solid-state switch K2 in the first branch of the outer bridge is connected with the cathode of the solid-state switch K1 in the second branch of the outer bridge, the connection point is marked as a second connection point of the outer bridge, and the second connection point is connected with the other end of the rapid mechanical switch K, the other end of the oscillation branch and the other end of the voltage limiting branch.
8. The hybrid dual bridge dc breaker topology circuit according to claim 3, wherein the anode of the IGCT1 in the first branch of the inner bridge is connected to the anode of the IGCT2 in the second branch of the inner bridge, and the connection point is denoted as the first connection point of the inner bridge; the cathode of the IGCT4 in the first branch of the inner bridge is connected with the cathode of the IGCT3 in the second branch of the inner bridge, and the connection point is marked as a second connection point of the inner bridge; the first connecting point of the inner bridge is connected with the cathode of a solid-state switch K1 and the cathode of a solid-state switch K2 in the first branch of the outer bridge; the second connecting point of the inner bridge is connected with the anode of the solid-state switch K1 and the anode of the solid-state switch K2 in the second branch of the outer bridge.
9. The hybrid dual-bridge direct current breaker topology circuit according to claim 7, wherein the oscillating branch comprises a capacitor C2 and a solid-state switch group K3 connected in series, one end of the capacitor C2 is connected to one end of the solid-state switch group K3, the other end of the capacitor C2 is connected to the first connection point of the external bridge, and the other end of the solid-state switch group K3 is connected to the second connection point of the external bridge.
10. The hybrid dual bridge dc breaker topology of claim 9, wherein the set of solid state switches K3 comprises two anti-parallel solid state switches.
11. The hybrid dual bridge dc breaker topology circuit of claim 9, wherein said voltage limiting branch comprises a voltage limiting MOV1 and a voltage limiting MOV2 connected in series, one end of said voltage limiting MOV1 is connected to one end of a voltage limiting MOV2, the other end of said voltage limiting MOV1 is connected to the outer bridge first connection point, and the other end of said voltage limiting MOV2 is connected to the outer bridge second connection point.
12. The hybrid dual bridge dc breaker topology circuit of claim 11, wherein a connection point of one end of the voltage limiting MOV1 and one end of the voltage limiting MOV2 is designated as an oscillation branch connection point, a connection point of one end of the capacitor C2 and one end of the solid state switch group K3 is designated as a voltage limiting branch connection point, and the oscillation branch connection point is connected to the voltage limiting branch connection point.
13. The hybrid dual bridge dc breaker topology circuit of claim 9, wherein each of said solid state switches K1, K2 and K3 is configured with a voltage limited MOV of corresponding voltage class connected in parallel therewith.
14. The hybrid dual bridge dc breaker topology of claim 9, wherein the solid state switch K2 includes all fully-controlled and half-controlled power electronics; the solid state switch K1 comprises all fully controlled power electronics; the solid-state switch group K3 comprises all full-control power electronic devices and half-control power electronic devices.
15. A method of controlling a hybrid dual bridge dc breaker topology circuit according to any of claims 1-14, wherein said method of controlling comprises:
after a short-circuit fault occurs, the system sends a brake opening instruction to the quick mechanical switch, and the quick mechanical switch K starts to act;
when the contact of the quick mechanical switch K is separated by a designated gap, the solid-state switch K1 on the outer bridge arm and the IGCTs 1 and 3 in the inner bridge are conducted;
a capacitor C1 is precharged with voltage to commutate current from the main current branch to the transfer branch;
with the surge of the fault current, the voltage on the capacitor C1 quickly drops to 0 and charges in the reverse direction;
when the voltage on the capacitor C1 reaches a specified amplitude, an IGCT2 in the inner bridge is switched on;
the current is converted into the IGCT2 from the IGCT1 by using the voltage of the capacitor C1, at the moment, a certain voltage exists in the capacitor 1, and the fault current completely flows through the bridge arms on the same side of the inner bridge, namely the IGCT2 and the IGCT 3;
after the current conversion is finished, the IGCT is switched off 1;
when the distance of the rapid mechanical switch K reaches the distance which can resist the overvoltage, the IGCT4 is conducted;
the voltage on the capacitor C1 is used for converting the current in the inner bridge lower tube, and the current is converted from the IGCT3 to the IGCT 4;
the IGCT3 is turned off, and the fault current charges the capacitor C1, so that the polarity of the voltage of the capacitor C1 changes;
when the voltage on the capacitor C1 reaches a specified amplitude, the solid-state switch 3 is switched on;
the voltage on the capacitor C1 is used for converting the current to the oscillation branch;
when the current of the branch circuit drops to 0, the solid-state switch K1, the IGCT2 and the IGCT4 are turned off;
when the voltage on the capacitor C2 reaches the action of the voltage-limiting MOV1, the MOV1 absorbs the energy in the system, and the current of the transfer branch is reduced to 0, and the solid-state switch K1 and the solid-state switch K2 are both in the on-off state, thereby completing the on-off.
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