CN103441489A - Direct-current breaker used for multi-terminal direct current system and control method of direct-current breaker - Google Patents
Direct-current breaker used for multi-terminal direct current system and control method of direct-current breaker Download PDFInfo
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Abstract
The invention discloses a direct-current breaker used for a multi-terminal direct current system and a control method of the direct-current breaker. The breaker comprises a lightning arrester, a main switch branch circuit and auxiliary switch circuits, wherein the lightning arrester is in parallel connection with the main switch branch circuit. The main switch branch circuit comprises two breaking units which are identical in structure and in serial connection, wherein each breaking unit comprises a direct-current load switch and a thyrister valve section, and the direct-current load switch and the thyrister valve sections are in serial connection. The two ends of each breaker unit are in parallel connection with the auxiliary switch circuits which are identical in structure. Each auxiliary switch circuit comprises a thyrister-reactance serial-connection branch circuit, a diode, a capacitor and a resistor, wherein the diodes are connected to the two ends of the breaking units in parallel, and each thyrister-reactance serial-connection branch circuit and each capacitor are in earth parallel connection with the two ends of each corresponding diode and are grounded through the resistors. In the method that reverse currents are implanted, direct currents of the main switch branch circuit cross zero to be cut off, and load currents are cut off through a direct-current load switch in the structure of the direct-current breaker.
Description
Technical field
The invention belongs to electric and electronic technical field, be specifically related to DC circuit breaker and control method thereof for a kind of MTDC transmission system.
Background technology
Multi-terminal HVDC transmission technology can realize that multiple feed, many drop points are subject to electricity, is a kind of flexible, quick, economic power transmission mode, meets the growth requirement of power industry.DC circuit breaker is a kind of very important equipment in the multi-terminal HVDC transmission engineering, in MTDC transmission system, adopt DC circuit breaker just can give full play to the characteristics and advantages of MTDC transmission system, it is high that yet DC circuit breaker breaking direct current process is born voltage, need the energy of absorption large especially, it is fast that speed is cut-off in requirement, reliability is high, and need to cut-off bidirectional current.At present, some scholars are studying its corresponding DC circuit breaker.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes DC circuit breaker and control method thereof for a kind of MTDC transmission system, core is based on the mode disjunction direct current that the current transfer principle adopts the stack reverse current, realized the two-way disjunction of electric current, for the development of DC circuit breaker provides a brand-new technology path.
A kind of MTDC transmission system DC circuit breaker provided by the invention, its improvements are, comprise lightning arrester, main switch branch road and auxiliary switching circuit; Described lightning arrester and described main switch branch circuit parallel connection;
Described main switch props up the identical cutout units in series of two groups of structures of route and forms, and is respectively the first cutout unit and the second cutout unit; Described the first cutout unit comprises the first DC load switch and first thyristor valve section of series connection; Described the first DC load switch comprises AC circuit breaker BRK1 in parallel and a LC series arm; Described the second cutout unit comprises the second DC load switch and second thyristor valve section of series connection; Described the second DC load switch comprises AC circuit breaker BRK2 in parallel and the 2nd LC series arm;
At described first cutout two ends, unit the first auxiliary switching circuit in parallel; At described second cutout two ends, unit the second auxiliary switching circuit in parallel;
Described the first auxiliary switching circuit comprises thyristor T12-reactance L2 series arm, diode D1, capacitor C 1 and resistance R 1; Described diode D1 is connected in parallel on described the first cutout two ends, unit; Described thyristor T12-reactance L2 series arm and described capacitor C 1 are connected in described diode D1 two ends over the ground, and by described resistance R 1 ground connection;
Described the second auxiliary switching circuit comprises thyristor T22-reactance L1 series arm, diode D2, capacitor C 2 and resistance R 2; Described diode D2 is connected in parallel on described the second cutout two ends, unit; Described thyristor T22-reactance L1 series arm and described capacitor C 2 are connected in described diode D2 two ends over the ground, and by described resistance R 2 ground connection.
Wherein, a described LC series arm comprises capacitor C 3 and the reactance L3 of series connection; Described the 2nd LC series arm comprises capacitor C 4 and the reactance L4 of series connection.
Wherein, described the first thyristor valve section comprises thyristor T1, thyristor T11, diode D11 and resistance R 3; Diode D11 is with in parallel with described thyristor T1 and described thyristor T11 respectively after described resistance R 3 is connected; Described thyristor T1 and thyristor T11 are the inverse parallel structure; Described diode D11 and described diode D1 opposite direction;
Described the second thyristor valve section comprises thyristor T2, thyristor T21, diode D21 and resistance R 4; Diode D21 is with in parallel with described thyristor T2 and described thyristor T21 respectively after described resistance R 4 is connected; Described thyristor T2 and thyristor T21 are the inverse parallel structure; Described diode D21 and described diode D2 opposite direction.
Wherein, in described the first auxiliary switching circuit, the anode of described thyristor T12 is connected with the negative pole of described diode D1, and its negative electrode is connected with the end of described reactance L2; Described capacitor C 1 one ends are connected with the positive pole of described diode D1; Described capacitor C 1 other end is connected with the other end of described reactance L2; Described reactance L2 is by described resistance R 1 ground connection;
In described the second auxiliary switching circuit, the anode of described thyristor T22 is connected with the negative pole of described diode D2, and its negative electrode is connected with the end of described reactance L1; Described capacitor C 2 one ends are connected with the positive pole of described diode D2; Described capacitor C 2 other ends are connected with the other end of described reactance L1; Described reactance L1 is by described resistance R 2 ground connection.
Wherein, the number of the described diode D1 in described the first auxiliary switching circuit and described thyristor T12 is more than two;
Described diode D2 in described the second auxiliary switching circuit and the number of described thyristor T22 are more than two.
Wherein, the diode D2 negative pole in the diode D1 in described the first auxiliary switching circuit and described the second auxiliary switching circuit joins, and positive pole is connected with the current limiting reactor in circuit.
The present invention is based on a kind of MTDC transmission system that another purpose provides control method with DC circuit breaker, its improvements are, described method comprises the steps:
(1) by the DC circuit breaker line attachment, and maintenance thyristor T1, thyristor T2, thyristor T11, thyristor T21, thyristor T12 and thyristor T22 are blocking, AC circuit breaker BRK1 and AC circuit breaker BRK2 are open mode, and capacitor charging is to rated voltage;
(2) open DC circuit breaker;
(3), while breaking down, the current type in the judgement circuit, be fault current or DC load electric current;
(4) according to different current type, DC circuit breaker is turn-offed in different ways.
Wherein, step (2) comprises the opening process of DC circuit breaker:
While 1) opening, the AC circuit breaker BRK2 in closed the second cutout unit;
2) the thyristor T21 of described the second cutout unit of triggering and conducting;
3) the AC circuit breaker BRK1 in closed the first cutout unit;
4) the thyristor T11 in described the first cutout unit of conducting.
Wherein, step (4), according to current type, is turn-offed control to DC circuit breaker, comprising:
For fault current:
1. the thyristor T22 in triggering and conducting the second auxiliary switching circuit;
2. open the described AC circuit breaker BRK2 in described the second cutout unit;
3. lightning arrestor movement absorb energy;
4. disconnect the AC circuit breaker BRK1 in described the first cutout unit;
For the DC load electric current:
I) disconnect the described AC circuit breaker BRK2 in described the second cutout unit;
Ii) lightning arrestor movement absorb energy.
Wherein, step (2) comprises the opening process of DC circuit breaker:
While 1 > opening, the AC circuit breaker BRK1 in closed the first cutout unit;
2 > the thyristor T1 of described the second cutout unit of triggering and conducting;
3 > the AC circuit breaker BRK2 in closed the second cutout unit;
4 > the thyristor T2 in described the second cutout unit of conducting.
Wherein, step (4), according to current type, is turn-offed control to DC circuit breaker, comprising:
For fault current:
A) the thyristor T12 in triggering and conducting the first auxiliary switching circuit;
B) open the described AC circuit breaker BRK1 in described the first cutout unit;
C) lightning arrestor movement absorb energy;
D) disconnect the AC circuit breaker BRK2 in described the second cutout unit;
For the DC load electric current:
I) disconnect the described AC circuit breaker BRK1 in described the first cutout unit;
II) lightning arrestor movement absorb energy.
Compared with the prior art, beneficial effect of the present invention is:
The present invention combines forced commutation thought and current transfer disjunction thought, has realized the disjunction of hicap direct current.
The present invention adopts half control type device thyristor to form the DC circuit breaker topology, utilizes half control type device to replace expensive full-control type device, and on-state loss is low, and manufacturing cost and heat radiation require lower, technology maturation.
The present invention can be applicable to the high-voltage great-current occasion, and topological structure is simply compact, controls simple and easyly, and extensibility is high.
The present invention's application quick isolation switch, realized the disjunction of multi-state bidirectional, dc electric current, and breaking course is quick without arc.
The present invention utilizes auxiliary switching circuit to realize the soft open-minded of DC circuit breaker, has reduced the stress that the power device opening process bears.
The present invention takes the lead in the DC load switch application in DC circuit breaker, and the direct current in the time of can directly completing the load current operating mode cuts off and conversion, in the useful life that strengthens DC circuit breaker, increases its reliability.
The invention belongs to the mixed type high voltage DC breaker, combine the two advantage of mechanical type DC circuit breaker and solid-state direct-current circuit breaker, research and development difficulty less, be applicable to various MTDC transmission systems.
The present invention utilizes circuit for capacitor charging in auxiliary switching circuit, does not need additionally to increase charging device, thereby reduces equipment room electrical isolation difficulty, reduces floor space and cost, is easy to through engineering approaches and realizes.
The accompanying drawing explanation
Fig. 1 is DC circuit breaker structure chart provided by the invention.
The waveform schematic diagram that Fig. 2 is disjunction fault current provided by the invention.
The waveform schematic diagram that Fig. 3 is disjunction load current provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
A kind of MTDC transmission system DC circuit breaker that the present embodiment proposes, it is connected respectively after current limiting reactor and accesses electrical network by two ends, and its structure as shown in Figure 1, comprises lightning arrester and main switch branch road and auxiliary switching circuit; Wherein lightning arrester and main switch branch circuit parallel connection.
In figure, main switch props up the first cutout unit and the second cutout units in series that two groups of structures of route are identical and forms.The first cutout unit comprises the first DC load switch and first thyristor valve section of series connection; The first DC load switch comprises high pressure SF in parallel
6circuit breaker BRK1 and by capacitor C 3 and a reactance L3 LC series arm in series; The first thyristor valve section comprises thyristor T1, thyristor T11, diode D11 and resistance R 3; Diode D11 is with in parallel with thyristor T1 and thyristor T11 respectively after resistance R 3 is connected; Thyristor T1 and thyristor T11 are the inverse parallel structure; Diode D11 and diode D1 opposite direction.The second cutout unit comprises the second DC load switch and second thyristor valve section of series connection; The second DC load switch comprises high pressure SF in parallel
6circuit breaker BRK2 and by capacitor C 4 the two LC series arm in series with reactance L4; The second thyristor valve section comprises thyristor T2, thyristor T21, diode D21 and resistance R 4; Diode D21 is with in parallel with thyristor T2 and thyristor T21 respectively after resistance R 4 is connected; Thyristor T2 and thyristor T21 are the inverse parallel structure; Diode D21 and diode D2 opposite direction.
The present embodiment is the first auxiliary switching circuit in parallel at the first two ends, cutout unit, the second auxiliary switching circuit in parallel at the second two ends, cutout unit.
As shown in Figure 1, the first auxiliary switching circuit comprises thyristor T12-reactance L2 series arm, diode D1, capacitor C 1 and resistance R 1; Diode D1 is connected in parallel on the first two ends, cutout unit; Thyristor T12-reactance L2 series arm and capacitor C 1 are connected in diode D1 two ends over the ground, and by resistance R 1 ground connection.
The second auxiliary switching circuit comprises thyristor T22-reactance L1 series arm, diode D2, capacitor C 2 and resistance R 2; Described diode D2 is connected in parallel on described the second cutout two ends, unit; Described thyristor T22-reactance L1 series arm and described capacitor C 2 are connected in described diode D2 two ends over the ground, and by described resistance R 2 ground connection.
In the first auxiliary switching circuit, diode D1 comprises the diode (in figure only with a sign) of at least two series aiding connections, and it is connected in parallel on the first two ends, cutout unit, the diode D11 opposite direction in direction and the first thyristor valve section.Thyristor T12 also consists of the Thyristors in series of at least two, the thyristor T1 anodic bonding in its anode and the first cutout unit, and the negative electrode of thyristor T12 is connected with reactance L2; The other end of reactance L2 is connected with an end of capacitor C 1, and the other end of capacitor C 1 is connected with the first direct current change over switch; Between reactance L2 and capacitor C 1, by resistance R 1 ground connection, R1 plays metering function, and reactance L2 works the short circuit current effect that suppresses.
In the second auxiliary switching circuit, diode D2 comprises the diode (in figure only with a sign) of at least two series aiding connections, and it is connected in parallel on the second two ends, cutout unit, the diode D21 opposite direction in direction and the second thyristor valve section.Thyristor T22 also consists of the Thyristors in series of at least two, and the second direct current change over switch in its anode and the second cutout unit is connected, and the negative electrode of thyristor T22 is connected with reactance L1; The other end of reactance L1 is connected with an end of capacitor C 2, the thyristor T2 anodic bonding in the other end of capacitor C 2 and the second cutout unit; Between reactance L1 and capacitor C 2, by resistance R 2 ground connection, R2 plays metering function, and reactance L1 works the short circuit current effect that suppresses.
In the present embodiment, the diode D2 negative pole in the diode D1 in the first auxiliary switching circuit and described the second auxiliary switching circuit joins, and positive pole is connected with the current limiting reactor in circuit.
Corresponding, the present embodiment proposes the control method of a kind of MTDC transmission system with DC circuit breaker, due to this breaker structure symmetry, the alive disjunction mechanism of bidirectional flow is identical, only get forward and do principle analysis, but analogy in the other direction, sense of current I shown in accompanying drawing 1
dcpositive direction for electric current.Opening with breaking course to DC circuit breaker under different operating modes describes:
Operating mode 1: disjunction fault current
Opening process:
Capacitor C 1 and C2 utilize link tester to cross auxiliary switching circuit C1-R and C2-R charges and keeps normal electriferous state, and voltage stabilization is in system rated voltage level.Closed SF6 circuit breaker BRK2, now the system direct current flows through then triggering and conducting T21 of D1-BRK2-D21-R2 branch road, and because D21 is many diode series connection, impedance is much larger than the isolating valve branch road, therefore electric current is transferred to rapidly the T21 branch road; Then closed SF6 circuit breaker BRK1 conducting T11 are because D11 is also many diode series connection, impedance is much larger than the T11 branch road, electric current is transferred to rapidly the BRK1-T11-BRK2-T21 branch road, wait flow through the stable and capacitor C 1 of circuit breaker current and C2 voltage all stable after, system enters steady operation, so far the DC circuit breaker opening process finishes, and capacitor C 1 and C2 voltage direction are upper just lower negative, identical with direction as shown.
Breaking course:
When needs DC circuit breaker disjunction line fault electric current, triggering and conducting T22, effect due to capacitance voltage, capacitor C2 produces a pulse current reverse with the circuit forward current rapidly in T21-BRK2-T22-inductance L 2 forms loop, make current over-zero in thyristor T21, because the D2 conducting provides reverse voltage to T21, thyristor T21 turn-offs, separating brake SF6 circuit breaker BRK2 under no current state; After SF6 circuit breaker BRK2 recovers blocking ability, electric current is transferred to the BRK1-T11-T22-L2-C2 branch road fully, gives capacitor C2 charging simultaneously, make capacitor C2 voltage by upper just lower negative become upper negative under just, contrary with direction as shown.When the BRK1-T11-T22-L2-C2 branch voltage reaches lightning arrester MOV operation voltage, lightning arrester MOV action, electric current shifts to lightning arrester MOV place branch road, when capacitor C2 charging current is zero, electric current is transferred to the MOV branch road fully, the energy stored in lightning arrester MOV absorption circuit and current-limiting inductance, thyristor T22 turn-offs, SF6 circuit breaker BRK1 separating brake, treat that in lightning arrester, electric current is decreased to 0 gradually, lightning arrester recovers blocking state, the complete disjunction of current through line circuit breaker current, and so far turn off process finishes.
Operating mode 2: disjunction stable state DC load electric current
Opening process:
Capacitor C 1 and C2 utilize link tester to cross auxiliary switching circuit C1-R and C2-R charges and keeps normal electriferous state, and voltage stabilization is in system rated voltage level.Closed SF6 circuit breaker BRK2, now the system direct current flows through then triggering and conducting T21 of D1-BRK2-D21-R2 branch road, and because D21 is many diode series connection, impedance is much larger than the isolating valve branch road, therefore electric current is transferred to rapidly the T21 branch road; Then closed SF6 circuit breaker BRK1 conducting T11 are because D11 is also many diode series connection, impedance is much larger than the T11 branch road, electric current is transferred to rapidly the BRK1-T11-BRK2-T21 branch road, wait flow through the stable and capacitor C 1 of circuit breaker current and C2 voltage all stable after, system enters steady operation, so far the DC circuit breaker opening process finishes, and capacitor C 1 and C2 voltage direction are upper just lower negative, identical with direction as shown.
Breaking course:
When needs cutting system stable state DC load electric current, can directly by the direct current change over switch, move to cut off load current.Separating brake SF6 circuit breaker BRK2, its LC branch road in parallel can make SF6 circuit breaker BRK2 branch current zero crossing separating brake occur to SF6 circuit breaker BRK2 branch road stack self-oscillation electric current, system power starts the capacitor charging of the LC branch road in parallel to it afterwards, when capacitance voltage reaches lightning arrester MOV operation voltage, the MOV action, electric current is all transferred to MOV place branch road, the energy stored in MOV absorption circuit and current-limiting inductance, treat that in lightning arrester, electric current is decreased to 0 gradually, lightning arrester recovers blocking state, so far the current through line circuit breaker meets the complete disjunction of electric current, turn off process finishes.
As shown in Figure 2, be the waveform schematic diagram of disjunction fault current.By controlling of the DC circuit breaker to the present embodiment proposition, as can be seen from the figure, through the disjunction of 1.4ms master's branch road direct current, ultimate current is transferred to lightning arrester and carries out energy dissipation.
As shown in Figure 3, be the waveform schematic diagram of disjunction load current.By controlling of the DC circuit breaker to the present embodiment proposition, as can be seen from the figure, through the disjunction of 1.3ms master's branch road direct current, ultimate current is transferred to lightning arrester and carries out energy dissipation.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment, the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (11)
1. a MTDC transmission system DC circuit breaker, is characterized in that, comprises lightning arrester, main switch branch road and auxiliary switching circuit; Described lightning arrester and described main switch branch circuit parallel connection;
Described main switch props up the identical cutout units in series of two groups of structures of route and forms, and is respectively the first cutout unit and the second cutout unit; Described the first cutout unit comprises the first DC load switch and first thyristor valve section of series connection; Described the first DC load switch comprises AC circuit breaker BRK1 in parallel and a LC series arm; Described the second cutout unit comprises the second DC load switch and second thyristor valve section of series connection; Described the second DC load switch comprises AC circuit breaker BRK2 in parallel and the 2nd LC series arm;
At described first cutout two ends, unit the first auxiliary switching circuit in parallel; At described second cutout two ends, unit the second auxiliary switching circuit in parallel;
Described the first auxiliary switching circuit comprises thyristor T12-reactance L2 series arm, diode D1, capacitor C 1 and resistance R 1; Described diode D1 is connected in parallel on described the first cutout two ends, unit; Described thyristor T12-reactance L2 series arm and described capacitor C 1 are connected in described diode D1 two ends over the ground, and by described resistance R 1 ground connection;
Described the second auxiliary switching circuit comprises thyristor T22-reactance L1 series arm, diode D2, capacitor C 2 and resistance R 2; Described diode D2 is connected in parallel on described the second cutout two ends, unit; Described thyristor T22-reactance L1 series arm and described capacitor C 2 are connected in described diode D2 two ends over the ground, and by described resistance R 2 ground connection.
2. DC circuit breaker as claimed in claim 1, is characterized in that, a described LC series arm comprises capacitor C 3 and the reactance L3 of series connection;
Described the 2nd LC series arm comprises capacitor C 4 and the reactance L4 of series connection.
3. DC circuit breaker as claimed in claim 1, is characterized in that, described the first thyristor valve section comprises thyristor T1, thyristor T11, diode D11 and resistance R 3; Diode D11 is with in parallel with described thyristor T1 and described thyristor T11 respectively after described resistance R 3 is connected; Described thyristor T1 and thyristor T11 are the inverse parallel structure; Described diode D11 and described diode D1 opposite direction;
Described the second thyristor valve section comprises thyristor T2, thyristor T21, diode D21 and resistance R 4; Diode D21 is with in parallel with described thyristor T2 and described thyristor T21 respectively after described resistance R 4 is connected; Described thyristor T2 and thyristor T21 are the inverse parallel structure; Described diode D21 and described diode D2 opposite direction.
4. DC circuit breaker as claimed in claim 1, is characterized in that, in described the first auxiliary switching circuit, the anode of described thyristor T12 is connected with the negative pole of described diode D1, and its negative electrode is connected with the end of described reactance L2; Described capacitor C 1 one ends are connected with the positive pole of described diode D1; Described capacitor C 1 other end is connected with the other end of described reactance L2; Described reactance L2 is by described resistance R 1 ground connection;
In described the second auxiliary switching circuit, the anode of described thyristor T22 is connected with the negative pole of described diode D2, and its negative electrode is connected with the end of described reactance L1; Described capacitor C 2 one ends are connected with the positive pole of described diode D2; Described capacitor C 2 other ends are connected with the other end of described reactance L1; Described reactance L1 is by described resistance R 2 ground connection.
5. DC circuit breaker as claimed in claim 1, is characterized in that, the described diode D1 in described the first auxiliary switching circuit and the number of described thyristor T12 are more than two;
Described diode D2 in described the second auxiliary switching circuit and the number of described thyristor T22 are more than two.
6. described DC circuit breaker as arbitrary as claim 1-5, is characterized in that, the diode D2 negative pole in the diode D1 in described the first auxiliary switching circuit and described the second auxiliary switching circuit joins, and positive pole is connected with the current limiting reactor in circuit.
7. the control method of a MTDC transmission system use DC circuit breaker, is characterized in that, described method comprises the steps:
(1) by the DC circuit breaker line attachment, and maintenance thyristor T1, thyristor T2, thyristor T11, thyristor T21, thyristor T12 and thyristor T22 are blocking, AC circuit breaker BRK1 and AC circuit breaker BRK2 are open mode, and capacitor charging is to rated voltage;
(2) open DC circuit breaker;
(3), while breaking down, the current type in the judgement circuit, be fault current or DC load electric current;
(4) according to different current type, DC circuit breaker is turn-offed in different ways.
8. control method as claimed in claim 7, is characterized in that, step (2) comprises the opening process of DC circuit breaker:
While 1) opening, the AC circuit breaker BRK2 in closed the second cutout unit;
2) the thyristor T21 of described the second cutout unit of triggering and conducting;
3) the AC circuit breaker BRK1 in closed the first cutout unit;
4) the thyristor T11 in described the first cutout unit of conducting.
9. control method as claimed in claim 8, is characterized in that, step (4), according to current type, is turn-offed control to DC circuit breaker, comprising:
For fault current:
1. the thyristor T22 in triggering and conducting the second auxiliary switching circuit;
2. open the described AC circuit breaker BRK2 in described the second cutout unit;
3. lightning arrestor movement absorb energy;
4. disconnect the AC circuit breaker BRK1 in described the first cutout unit;
For the DC load electric current:
I) disconnect the described AC circuit breaker BRK2 in described the second cutout unit;
Ii) lightning arrestor movement absorb energy.
10. control method as claimed in claim 7, is characterized in that, step (2) comprises the opening process of DC circuit breaker:
While 1 > opening, the AC circuit breaker BRK1 in closed the first cutout unit;
2 > the thyristor T1 of described the second cutout unit of triggering and conducting;
3 > the AC circuit breaker BRK2 in closed the second cutout unit;
4 > the thyristor T2 in described the second cutout unit of triggering and conducting.
11. control method as claimed in claim 10, is characterized in that, step (4), according to current type, is turn-offed control to DC circuit breaker, comprising:
For fault current:
A) the thyristor T12 in triggering and conducting the first auxiliary switching circuit;
B) open the described AC circuit breaker BRK1 in described the first cutout unit;
C) lightning arrestor movement absorb energy;
D) disconnect the AC circuit breaker BRK2 in described the second cutout unit;
For the DC load electric current:
I) disconnect the described AC circuit breaker BRK1 in described the first cutout unit;
II) lightning arrestor movement absorb energy.
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| CN103928913A (en) * | 2014-03-31 | 2014-07-16 | 华中科技大学 | High-voltage direct-current circuit breaker based on rapid repulsion force mechanism and insulating transformer |
| CN104882877A (en) * | 2014-02-28 | 2015-09-02 | 西门子公司 | High voltage direct current breaker |
| CN105720552A (en) * | 2016-01-25 | 2016-06-29 | 华北电力大学 | Current-limiting high-voltage direct current breaker |
| CN106159881A (en) * | 2015-05-13 | 2016-11-23 | Ls产电株式会社 | Dc circuit breaker and the method using dc circuit breaker |
| CN104242652B (en) * | 2014-09-17 | 2017-02-15 | 大连工业大学 | High-voltage direct current vacuum circuit breaker self-supplying power source topological structure based on modules connected in series |
| CN107947535A (en) * | 2017-12-22 | 2018-04-20 | 清华四川能源互联网研究院 | A kind of superhigh voltage DC breaker power electronics tributary unit |
| CN112383032A (en) * | 2020-09-30 | 2021-02-19 | 四川大学 | Thyristor-based active direct current circuit breaker and control method thereof |
| CN114421420A (en) * | 2022-02-10 | 2022-04-29 | 华北电力大学（保定） | Resistance-inductance current-limiting type multi-port direct-current circuit breaker suitable for flexible direct-distribution power grid |
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| CN103928913B (en) * | 2014-03-31 | 2016-05-25 | 华中科技大学 | A kind of high voltage DC breaker based on rapid repulsion mechanism and insulating transformer |
| CN103928913A (en) * | 2014-03-31 | 2014-07-16 | 华中科技大学 | High-voltage direct-current circuit breaker based on rapid repulsion force mechanism and insulating transformer |
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| CN105720552A (en) * | 2016-01-25 | 2016-06-29 | 华北电力大学 | Current-limiting high-voltage direct current breaker |
| CN105720552B (en) * | 2016-01-25 | 2019-05-31 | 华北电力大学 | A kind of current-limiting type high voltage DC breaker |
| CN107947535A (en) * | 2017-12-22 | 2018-04-20 | 清华四川能源互联网研究院 | A kind of superhigh voltage DC breaker power electronics tributary unit |
| CN107947535B (en) * | 2017-12-22 | 2024-02-20 | 清华四川能源互联网研究院 | Power electronic branch unit of ultrahigh voltage direct current circuit breaker |
| CN112383032A (en) * | 2020-09-30 | 2021-02-19 | 四川大学 | Thyristor-based active direct current circuit breaker and control method thereof |
| CN112383032B (en) * | 2020-09-30 | 2022-05-20 | 四川大学 | Thyristor-based active direct current breaker and control method thereof |
| CN114421420A (en) * | 2022-02-10 | 2022-04-29 | 华北电力大学（保定） | Resistance-inductance current-limiting type multi-port direct-current circuit breaker suitable for flexible direct-distribution power grid |
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