CN103646805A - Direct-current breaker topology - Google Patents
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- CN103646805A CN103646805A CN201310648654.0A CN201310648654A CN103646805A CN 103646805 A CN103646805 A CN 103646805A CN 201310648654 A CN201310648654 A CN 201310648654A CN 103646805 A CN103646805 A CN 103646805A
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Abstract
The invention relates to a direct-current breaker topology comprising a first current path (1), a second current path (2), a third current path (3) and a fourth current path(4). A first leading-out terminal of the fourth current path (4), a first leading-out terminal of the third current path (3), a first leading-out terminal of the second current path (2), and a first leading-out terminal of the first current path (1) are connected together to form a first leading-out terminal (5) of the direct-current breaker; and the first leading-out terminal (5) is connected with one end of a direct-current power transmission line. A second leading-out terminal of the fourth current path (4), a second leading-out terminal of the third current path (3), a second leading-out terminal of the second current path (2), and a second leading-out terminal of the first current path (1) are connected together to form a second leading-out terminal (6) of the direct-current breaker; and the second leading-out terminal (6) is connected with the other end of the direct-current power transmission line. When the system works normally, the direct-current breaker has the low loss; and when a fault occurs at a high-voltage direct-current power transmission line, the fault power transmission line can be disconnected rapidly.
Description
Technical field
The present invention relates to a kind of circuit breaker, be specifically related to a kind of DC circuit breaker.
Background technology
Fast DC Circuit Breaker is one of key equipment guaranteeing direct current transmission and distribution system and direct current network system stability safe and reliable operation.With AC system difference being, there is not natural zero-crossing point in the electric current of direct current system, so in direct current system, cannot as AC system, utilize the natural zero-crossing point of electric current to turn-off, so the problem of cut-offfing of direct current is a problem that is worth research always.
Breaking direct current has two kinds of modes conventionally at present, and the first is pure power electronics circuit breaker, and the patent CN102870181A as ABB application, utilizes the high-power power electronic device of turn-offing, directly disjunction direct current.The solid circuit breaker that utilizes this principle to manufacture, although can meet in time the requirement of multiterminal flexible direct current system, the loss when normally is excessive, economy is poor.
The second is to mix circuit breaker technology, on the basis of traditional interchange mechanical chopper, by increasing auxiliary Power Electronic Circuit, drop into current-limiting resistance with reduce short circuit current or on the direct current that cut-offs arc gap superimposed oscillation electric current, while utilizing current over-zero, cut-off circuit.The hybrid circuit breaker that utilizes this principle to manufacture, it has specific (special) requirements to mechanical switch, the more difficult requirement that meets DC transmission system on break-time.
A kind of mixing circuit breaker that Siemens patent WO2013/093066A1 proposes, connect on primary path mechanical switch and power electronics controlled device entirely, another bypass is comprised of electric capacity, when fault current being detected, on primary path, power electronics is controlled device disconnection entirely, mechanical switch also starts to cut-off, fault current charges to shunt capacitance, the shunt capacitance of sort circuit is can not value too small, otherwise mechanical switch is opened not yet completely, if shunt capacitance voltage under fault current charging rises, too fast meeting surpasses mechanical switch and power electronic device is born electric pressure.When yet capacitance value is large, the speed of cut-offfing will be affected.
A kind of mixing circuit breaker that the patent WO2011141054A1 of ABB AB proposes, connect on primary path mechanical switch and power electronics controlled device entirely, another bypass is composed in parallel by lightning arrester and crimping IGBT, when fault current being detected, the whole conductings of crimping IGBT in bypass, power electronics on primary path is controlled device disconnection entirely afterwards, mechanical switch also starts to turn-off, by the time mechanical switch completely closes and has no progeny, crimping IGBT turn-offs, lightning arrester place in circuit suppresses short circuit current, this circuit breaker cut-offs speed, but bearing voltage sum, the crimping IGBT of whole bypass must be greater than DC power transmission line initial voltage, this needs a large amount of crimping IGBT series connection, cause the cost of whole DC circuit breaker higher.
And above-mentioned two kinds of patent major loops all must adopt full control switching device to connect with mechanical switch, cause still having when normal larger conduction loss.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, propose a kind of hybrid DC circuit breaker.It is low that the present invention has holistic cost, during steady operation loss little, while there is short trouble, without arc cutting, respond the features such as rapid.
DC circuit breaker of the present invention is comprised of the first current path, the second current path, the 3rd current path and the 4th current path.The first leading-out terminal of the 4th current path, the first leading-out terminal of the 3rd current path, the first leading-out terminal of the second current path, the first leading-out terminal of the first current path links together, and as the first leading-out terminal of DC circuit breaker, is connected with one end of DC transmission line; The second leading-out terminal of the 4th current path, the 3rd current path the second leading-out terminal, the second leading-out terminal of the second current path, the second leading-out terminal of the first current path links together, and as the second leading-out terminal of DC circuit breaker, is connected with the other end of DC transmission line.
The another kind of connected mode of described DC circuit breaker is: the first leading-out terminal of the 4th current path, the first leading-out terminal of the 3rd current path, the first leading-out terminal of the second current path, after the first leading-out terminal of the first current path links together, can be connected with inductance one end, the other end of inductance is connected with DC power transmission line as the first leading-out terminal of DC circuit breaker
The second leading-out terminal of the 4th current path, the 3rd current path the second leading-out terminal, the second leading-out terminal of the second current path, after the second leading-out terminal of the first current path links together, also can be connected with inductance one end, the other end of inductance is connected with the other end of DC transmission line as the second leading-out terminal of described DC circuit breaker.
The first described current path is comprised of electronic power switch module and mechanical switch module.One end of electronic power switch module is connected with one end of mechanical switch, and the other end of electronic power switch module is as the first leading-out terminal of the first current path.
The second described current path comprises half control type device blocks and full-control type device blocks, and the anode of half control type device blocks is as the first leading-out terminal of the second current path, and the negative electrode of half control type device blocks is connected with one end of full-control type device blocks; The full-control type device blocks other end is as the second leading-out terminal of the second current path.
The 3rd described current path is comprised of capacitance module, and described capacitance module is comprised of at least one capacitor cell serial or parallel connection.
The 4th described current path is comprised of pressure limiting device blocks, and described pressure limiting device blocks is composed in series by the pressure limiting device of at least one.
When DC power transmission line is normally moved, the mechanical switch module of the first current path is closure state, and the electronic power switch module of the first current path is conducting state, when line short fault being detected, the full-control type device blocks of the half control type device blocks of the second described current path and the second described current path is received Continuity signal, the electronic power switch module of the first current path is turn-offed rapidly simultaneously, block the fault current of the first current path, mechanical switch module starts to cut-off, and fault current is transferred to rapidly the second current path, when the first current path mechanical switch module two ends contact cut-offs after certain distance, the full-control type device blocks of the second current path is turn-offed rapidly, block the fault current of second current path of flowing through, the half control type device blocks current over-zero of the second current path turn-offs naturally, fault current is transferred to the 3rd current path, capacitance module charging to the 3rd current path, when the capacitance module both end voltage of the 3rd current path rises to the 4th current path pressure limiting device blocks limit value, electric current switches to the 4th current path from the 3rd current path, now because capacitance module both end voltage is in the value higher than direct current transportation rotary substation, make fault current be dropped rapidly to zero.
Can be at pressure limiting device in parallel between described DC circuit breaker the first leading-out terminal and ground, pressure limiting device in parallel between described DC circuit breaker the second leading-out terminal and ground.
In the full-control type device blocks of connecting in half control type number of devices and the second current path in the half control type device blocks of the second current path, the quantity of full-control type device can be coordinated configuration flexibly, and at the second current path half control type device blocks and the second current path full-control type device blocks two ends the pressure limiting device of different limit values in parallel respectively, voltage is born by half control type device blocks as far as possible.Also can be at the various device blocks two ends that need protection pressure limiting device in parallel.
The second described current path half control type device blocks is composed in series by least one half control type device, and full-control type device blocks is composed in series by least one full-control type device, and this collocation method can make DC circuit breaker possess unidirectional current blocking ability.
The second described current path half control type device blocks is composed in series by least one inverse parallel half control device cell, and the second described current path full-control type device blocks is comprised of first group of full-control type device and second group of full-control type device differential concatenation; Meanwhile, the first current path full-control type device blocks is also comprised of first group of full-control type device and second group of full-control type device, and every group of full-control type device series aiding connection by least one forms.This collocation method can make whole DC circuit breaker possess bidirectional current blocking ability.
Described DC circuit breaker also can only comprise the second current path, and the 3rd current path and the 4th current path omit the first current path, and the speed of cut-offfing is like this faster, but conduction loss is higher.
Described DC circuit breaker the first current path can only comprise mechanical switch module, and the first current path electronic power switch can replace with wire.
Described DC circuit breaker the second current path can only comprise full-control type device blocks.
Between described DC circuit breaker first current path the first leading-out terminal and a leading-out terminal of the second current path, add the blocking-up electronic power switch module being formed by full-control type device.
Described blocking-up electric power electronic module is composed in series by half control type device serial module structure and full-control type device serial module structure.
The 3rd described current path capacitance module two ends can increase bleeder, thereby after DC line short trouble is got rid of, interior unnecessary voltage is held in the power down of can releasing fast, is convenient to again close a floodgate.
The present invention has following advantage:
A. this DC circuit breaker topology is cut-off more rapidly, can realize zero electric arc and cut-off;
B. whole change of current topology can adopt conventional components, and manufacture difficulty is relatively little, and reliability is high;
C. this DC circuit breaker can be controlled at short circuit current lower level, thus protection system fail safe;
D. this DC circuit breaker topology can reduce the impact of short circuit current on current conversion station;
E. be more easily combined with flexible DC power transmission system, be suitable for integrated design;
F. the loss when pure electronic power switch formula DC circuit breaker is compared system and normally worked is less;
G. when adopting half control device to replace the full control electronic power switch on initial current path, the normal running wastage of its system can be down to lower;
H. this circuit breaker current blocking-up path adopts multiple current path switched design method, is cut-offfing the fireballing while, and the cost of whole implementation is lower;
The possibility i. with multiple degrees of freedom optimal design, described the 4th current path and the 3rd described current path have the collocation method of different costs, according to actual condition, cut-off rate request flexible configuration.
Accompanying drawing explanation
Below in conjunction with the drawings and the specific embodiments, the invention will be further described.
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is the circuit theory diagrams of specific embodiments of the invention 1;
Fig. 3 is the circuit theory diagrams of specific embodiments of the invention 2;
Fig. 4 is the circuit theory diagrams of specific embodiments of the invention 3;
Fig. 5 is the circuit theory diagrams of specific embodiments of the invention 4;
Fig. 6 is the circuit theory diagrams of specific embodiments of the invention 5.
Embodiment
As shown in Figure 1, DC circuit breaker of the present invention comprises the first current path 1, the second current path 2, the 3rd current path 3 and the 4th current path 4; The first leading-out terminal of the 4th current path 4, the first leading-out terminal of the 3rd current path 3, the first leading-out terminal of the second current path and the first leading-out terminal of the first current path link together, and as the first leading-out terminal 5 of DC circuit breaker, are connected with one end of DC transmission line; The second leading-out terminal of the 4th current path 4, the 3rd current path 3 second leading-out terminals, the second leading-out terminal of the second current path 2 and the second leading-out terminal of the first current path link together, and as the second leading-out terminal 6 of DC circuit breaker, are connected with the other end of DC transmission line.
The first described current path 1 is comprised of electronic power switch module 12 and mechanical switch module 11.One end of electronic power switch module is connected with one end of mechanical switch 13, and the other end of electronic power switch module is as the first leading-out terminal of the first current path.
The second described current path 2 comprises half control type device blocks 21 and full-control type device blocks 22, the anode of half control type device blocks 21 is as the first leading-out terminal of the second current path 2, and the negative electrode of half control type device blocks 22 is connected with one end 23 of full-control type device blocks 22; The full-control type device blocks other end is as the second leading-out terminal of the second current path 2.
The 3rd described current path 3 is comprised of capacitance module C1, and described capacitance module is comprised of at least one capacitor cell serial or parallel connection.
The 4th described current path 4 is comprised of pressure limiting device blocks, and described pressure limiting device blocks is composed in series by least one pressure limiting device.
Figure 2 shows that embodiments of the invention 1.As shown in Figure 2, voltage source 15 is current conversion station, and resistance 16 is simulation short-circuit resistance.DC circuit breaker of the present invention is comprised of the first current path 1, the second current path 2, the three current paths 3 and the 4th current path 4; The first leading-out terminal of the 4th current path 4, the first leading-out terminal of the 3rd current path 3, the first leading-out terminal of the second current path and the first leading-out terminal of the first current path link together, and as the first leading-out terminal 5 of DC circuit breaker, are connected with one end of DC transmission line; The second leading-out terminal of the 4th current path 4, the 3rd current path 3 second leading-out terminals, the second leading-out terminal of the second current path 2 and the second leading-out terminal of the first current path link together, and as the second leading-out terminal 6 of DC circuit breaker, are connected with the other end of DC transmission line.
The first described current path 1 is comprised of electronic power switch module 12 and mechanical switch module 11.One end of electronic power switch module is connected with one end of mechanical switch, and the other end of electronic power switch module is as the first leading-out terminal of the first current path.
The second described current path 2 comprises half control type device blocks 21 and full-control type device blocks 22, the anode of half control type device blocks 21 is as the first leading-out terminal of the second current path 2, and the negative electrode of half control type device blocks 22 is connected with one end 23 of full-control type device blocks 22; The full-control type device blocks other end is as the second leading-out terminal of the second current path 2.
The 3rd described current path 3 is comprised of capacitance module C1, and described capacitance module is comprised of at least one capacitor cell serial or parallel connection.
The 4th described current path 4 is comprised of pressure limiting device blocks, and described pressure limiting device blocks is composed in series by the pressure limiting device of at least one.
When DC power transmission line is normally moved, the mechanical switch module 11 of the first current path 1 is closure state, and the electronic power switch module 12 of the first current path 1 is conducting state, when line short fault being detected, the full-control type device blocks 22 of the half control type device blocks 21 of the second described current path 2 and the second described current path 2 is received Continuity signal, the electronic power switch module 12 of the first current path 1 is turn-offed rapidly simultaneously, block the fault current of the first current path 1, mechanical switch mould, 11 start to cut-off, and fault current is transferred to rapidly the second current path 2, when the mechanical switch module 11 two ends contacts of the first current path 1 cut-off after certain distance, the full-control type device blocks 22 of the second current path 2 is turn-offed rapidly, block the fault current of second current path 2 of flowing through, half control type device blocks 21 current over-zeros of the second current path 2 turn-off naturally, fault current is transferred to the 3rd current path 3, logical to the 3rd electric current, 3 capacitance module C1 charging, when the capacitance module C1 of the 3rd current path 3 both end voltage rises to the pressure limiting device blocks limit value of the 4th current path 4, electric current switches to the 4th current path 4 from the 3rd current path 3, now because capacitance module C1 both end voltage is in the value higher than direct current transportation rotary substation, make fault current be dropped rapidly to zero.
Between first leading-out terminal and ground of the first current path 1, between second leading-out terminal and ground of the first current path 1, in order to the various piece of whole DC circuit breaker is carried out to overvoltage protection.Also can optionally at the local two ends that need protection, increase pressure limiting device.
Figure 3 shows that embodiments of the invention 2.As shown in Figure 3, the half control type device blocks 21 of the second described current path 2 is composed in series by least one inverse parallel half control device cell 24.The full-control type device blocks 22 of the second described current path 2 is comprised of first group of full-control type device 25 of the second current path and second group of full-control type device 26 differential concatenation of the second current path, and first group of full-control type device 25 and second group of full-control type device 26 form by least one full-control type device series aiding connection.The full-control type device blocks of the first current path 1 is comprised of first group of full-control type device 15 of the first current path and second group of full-control type device 16 of the first current path;
Figure 4 shows that embodiments of the invention 3.As shown in Figure 4, this embodiment has omitted the first current path 1, and whole DC circuit breaker is only comprised of the second current path 2, the three current paths 3 and the 4th current path 4, turn-off speed to fault current is faster, but has also increased conduction loss when system is normally moved simultaneously.
Embodiment 4
Figure 5 shows that embodiments of the invention 4.As shown in Figure 5, between first current path the first leading-out terminal and second current path the first leading-out terminal, added blocking-up electronic power switch module 100.Blocking-up electronic power switch module 100 is composed in parallel by full-control type device and lightning arrester, the electronic power switch module 12 of the first current path 1 adopts half control type device, the 3rd current path 3 only comprises capacitance module C1, when there is short trouble in DC power transmission line, 100 conductings of blocking-up electronic power switch module, the second current path half control type device blocks 21 is also received Continuity signal, the 3rd current path capacitance module C1 electric discharge afterwards, the first current path 1 is converted to rapidly the 3rd current path 3, the first current path electronic power switch module 12 current over-zeros turn-off naturally, when the 3rd current path capacitance module C1 enters reverse charging process, the second current path half control type device blocks 21 meets turn-on condition conducting, electric current is flowed through and is blocked electric power electronic module 100 and the second current path 2, after the mechanical switch module 11 of time delay to the first current path 1 is cut-off, full-control type device group in blocking-up electronic power switch module 100 is received cut-off signals, fault current is converted to the lightning arrester path of blocking-up electronic power switch module 100, and be reduced to rapidly zero.
In the present embodiment, described blocking-up electronic power switch module 100 also can adopt the mode of full-control type device and the series connection of half control type device, the mode that the first current path electronic power switch module 12 can adopt full-control type device or full-control type device to connect with half control type device, the second current path 2 can only include half control type device blocks, also can only include full-control type device blocks, also can be composed in series by both.Above-mentioned various building form can independent assortment, and control method is slightly different.
Fig. 6 is applicable to the embodiment of bipolarity flexible DC power transmission occasion as of the present invention another.As shown in Figure 6, the first leading-out terminal 61 of the first circuit breaker 60 is connected with the positive pole of bipolar transmission line, and the second leading-out terminal 62 of the first circuit breaker 60 is connected with simulation short-circuit resistance one end.The first leading-out terminal 63 of the second circuit breaker 65 is connected with the negative pole of bipolar transmission line, and the second leading-out terminal 64 of the second circuit breaker 65 is connected with the other end of simulation short-circuit resistance.
Claims (10)
1. a DC circuit breaker topology, is characterized in that: described DC circuit breaker is comprised of the first current path (1), the second current path (2), the 3rd current path (3) and the 4th current path (4); The first leading-out terminal of the 4th current path (4), the first leading-out terminal of the 3rd current path (3), the first leading-out terminal of the first leading-out terminal of the second current path (2) and the first current path (1) links together, and as first leading-out terminal (5) of DC circuit breaker, is connected with one end of DC transmission line; The second leading-out terminal of the 4th current path (4), the second leading-out terminal of the 3rd current path (3), the second leading-out terminal of the second current path (2)=and the second leading-out terminal of the first current path (1) link together, as second leading-out terminal (6) of DC circuit breaker, be connected with the other end of DC transmission line;
Described the first current path (1) is by electronic power switch module (12) and mechanical switch module (11); One end of electronic power switch module (12) is connected with one end of mechanical switch module (11), and the other end of electronic power switch module (12) is as the first leading-out terminal of the first current path (1);
Described the second current path (2) comprises half control type device blocks (21) and full-control type device blocks (22), the anode of half control type device blocks (21) is as the first leading-out terminal of the second current path (2), and the negative electrode of half control type device blocks (21) is connected with one end (23) of full-control type device blocks (22); Full-control type device blocks (22) other end is as the second leading-out terminal of the second current path (2);
The 3rd described current path (3) is comprised of capacitance module (C1), and described capacitance module (C1) is comprised of at least one capacitor cell serial or parallel connection;
The 4th described current path (4) is comprised of pressure limiting device blocks, and described pressure limiting device blocks is composed in series by the pressure limiting device of at least one.
2. according to DC circuit breaker topology claimed in claim 1, it is characterized in that: when DC power transmission line is normally moved, the mechanical switch module (11) of the first current path is closure state, and the electronic power switch module (12) of the first current path is conducting state, when line short fault being detected, the second described current path half control type device blocks (21) and the second described current path full-control type device blocks (22) are received Continuity signal, the first current path electronic power switch module (12) is turn-offed rapidly simultaneously, block the fault current of the first current path (1), mechanical switch module (11) starts to cut-off, and fault current is transferred to rapidly the second current path (2), when the first current path mechanical switch module (1) two ends contact cut-offs after certain distance, the full-control type device blocks (22) of the second current path (2) is turn-offed rapidly, block the fault current of the second current path (2) of flowing through, half control type device blocks (21) current over-zero of the second current path (2) turn-offs naturally, fault current is transferred to the 3rd current path (3), the capacitance module of the 3rd current path (C1) is charged, when capacitance module (C1) both end voltage of the 3rd current path (3) rises to the 4th current path pressure limiting device blocks limit value, electric current switches to the 4th current path (4) from the 3rd current path (3), now because capacitance module (C1) both end voltage is in the value higher than direct current transportation rotary substation, make fault current be dropped rapidly to zero.
3. according to DC circuit breaker claimed in claim 1 topology, it is characterized in that: pressure limiting device in parallel (7) between described DC circuit breaker the first leading-out terminal and ground, pressure limiting device in parallel (8) between described DC circuit breaker the second leading-out terminal and ground.
4. according to DC circuit breaker topology claimed in claim 1, it is characterized in that: the second described current path half control type device blocks (21) is composed in series by least one half control type device, and the second current path full-control type device blocks (22) is composed in series by least one full-control type device.
5. according to DC circuit breaker topology claimed in claim 1, it is characterized in that: the second described current path half control type device blocks (21) is composed in series by the inverse parallel half control device cell (24) of at least one, the second described current path full-control type device blocks (22) is comprised of first group of full-control type device of the second current path (25) and second group of full-control type device of the second current path (26) differential concatenation; First group of full-control type device (25) and second group of full-control type device (26) form by the full-control type device series aiding connection of at least one; The first current path full-control type device blocks is comprised of first group of full-control type device of the first current path (15) and second group of full-control type device of the first current path (16).
6. according to DC circuit breaker topology claimed in claim 1, it is characterized in that: described DC circuit breaker only comprises the second current path (2) the 3rd current path (3) and the 4th current path (4).
7. according to DC circuit breaker topology claimed in claim 1, it is characterized in that: the first described current path only comprises mechanical switch module (11), the first current path electronic power switch (12) replaces with wire.
8. according to DC circuit breaker topology claimed in claim 1, it is characterized in that: described the second current path (2) only comprises full-control type device blocks (22).
9. according to DC circuit breaker topology claimed in claim 1, it is characterized in that: described the second current path (2) only comprises half control type device blocks (21); Between first described current path the first leading-out terminal and second current path the first leading-out terminal, add the blocking-up electronic power switch module (100) being formed by full-control type device.
10. according to DC circuit breaker topology claimed in claim 9, it is characterized in that: described blocking-up electric power electronic module (100) is composed in series by half control type device serial module structure and full-control type device serial module structure.
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CN107370130A (en) * | 2017-09-08 | 2017-11-21 | 国家电网公司 | A kind of hybrid high voltage DC breaker and its control strategy based on modified half-bridge submodule |
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CN105743058B (en) * | 2014-12-31 | 2018-11-27 | Ls 产电株式会社 | The breaking method of DC breaker and the DC breaker |
CN105743058A (en) * | 2014-12-31 | 2016-07-06 | Ls产电株式会社 | Dc circuit breaker and method for breaking of dc circuit breaker |
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CN106099841B (en) * | 2015-04-28 | 2019-07-19 | 通用电气公司 | DC circuit-breaker and the method used |
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CN105281288B (en) * | 2015-10-22 | 2019-01-25 | 中国科学院电工研究所 | A kind of direct-current breaker topology having two-way blocking-up function |
CN105429099A (en) * | 2016-01-04 | 2016-03-23 | 许继集团有限公司 | High-voltage DC quick circuit breaker and power sub-module thereof |
CN106159882A (en) * | 2016-07-13 | 2016-11-23 | 西安交通大学 | A kind of solid-state direct-current chopper based on SiC MOSFET and control method thereof |
CN106159882B (en) * | 2016-07-13 | 2018-10-30 | 西安交通大学 | A kind of solid-state direct-current breaker and its control method based on SiC MOSFET |
CN107370130A (en) * | 2017-09-08 | 2017-11-21 | 国家电网公司 | A kind of hybrid high voltage DC breaker and its control strategy based on modified half-bridge submodule |
CN107370130B (en) * | 2017-09-08 | 2019-04-16 | 国家电网公司 | A kind of hybrid high voltage DC breaker and its control strategy based on modified half-bridge submodule |
CN109755924A (en) * | 2017-11-08 | 2019-05-14 | 清华大学 | A kind of circuit topological structure of hybrid dc circuit breaker and direct current transmission and distribution system |
CN110556806A (en) * | 2019-09-18 | 2019-12-10 | 西南交通大学 | Bypass capacitor value selection method for suppressing switch arc |
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