CN103457256B - A kind of MTDC transmission system DC circuit breaker and control method thereof - Google Patents
A kind of MTDC transmission system DC circuit breaker and control method thereof Download PDFInfo
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- CN103457256B CN103457256B CN201310359142.2A CN201310359142A CN103457256B CN 103457256 B CN103457256 B CN 103457256B CN 201310359142 A CN201310359142 A CN 201310359142A CN 103457256 B CN103457256 B CN 103457256B
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Abstract
The present invention is a kind of MTDC transmission system DC circuit breaker and control method thereof, and this DC circuit breaker comprises lightning arrester in parallel successively, main switch branch road and auxiliary switching circuit; Main switch branch road comprises isolating switch BRK1, thyristor T1 and thyristor T12; Connect with isolating switch BRK1 after thyristor T1 and thyristor T12 inverse parallel; Auxiliary switching circuit comprises the first auxiliary switching circuit and the second auxiliary switching circuit, symmetrical configuration, main switch branch road two ends are connected in parallel on, the valve section that each auxiliary switching circuit includes thyristor-reactance series arm, electric capacity, resistance and is made up of another thyristor and diode inverse parallel after being connected in series.The present invention makes direct current zero passage by its disjunction by the method injecting reverse current.The present invention can be applicable to high-voltage great-current occasion, and its topological structure is simple, and cost is low, and disjunction is quick, and control simple and easy, loss is lower.
Description
Technical field
The invention belongs to electric and electronic technical field, be specifically related to a kind of MTDC transmission system DC circuit breaker and control method thereof.
Background technology
Multi-terminal HVDC transmission technology can realize multiple feed, many drop points are powered, 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 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, but DC circuit breaker breaking direct current process to bear voltage high, need the energy of absorption large especially, it is fast that speed is cut-off in requirement, reliability is high, and needs to cut-off bidirectional current.At present, some scholars are studying the DC circuit breaker of its correspondence.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes a kind of MTDC transmission system DC circuit breaker and control method thereof, core is the mode disjunction direct current adopting superposition reverse current based on current commutation principle, achieve the two-way disjunction of electric current, the development for DC circuit breaker provides a fine technical strategies.
A kind of MTDC transmission system DC circuit breaker provided by the invention, described DC circuit breaker comprises lightning arrester in parallel successively, main switch branch road and auxiliary switching circuit; Its improvements are, described main switch branch road comprises isolating switch BRK1, thyristor T1 and thyristor T12; Connect with described isolating switch BRK1 after described thyristor T1 and thyristor T12 inverse parallel;
Described auxiliary switching circuit comprises the first auxiliary switching circuit and the second auxiliary switching circuit;
Described first auxiliary switching circuit comprises thyristor T13-reactance L1 series arm, electric capacity C1, resistance R1, thyristor T11 and diode D1; Described thyristor T11 and described diode D1 inverse parallel form the first valve section; Described thyristor T13-reactance L1 series arm and described electric capacity C1 are connected in described first valve section two ends over the ground, and by described resistance R1 ground connection;
Described second auxiliary switching circuit comprises thyristor T23-reactance L2 series arm, electric capacity C2, resistance R2, thyristor T21 and diode D2; Described thyristor T21 and described diode D2 inverse parallel form the second valve section; Described thyristor T23-reactance L2 series arm and described electric capacity C2 are connected in described second valve section two ends over the ground, and by described resistance R2 ground connection;
Described first valve section is connected with described second valve section afterwards and described main switch branch circuit parallel connection.
Wherein, in described first auxiliary switching circuit, the anode of described thyristor T13 is connected with the negative pole of described diode D1, and its negative electrode is connected with one end of described reactance L1; Described electric capacity C1 one end is connected with the positive pole of described diode D1; The described electric capacity C1 other end is connected with the other end of described reactance L1; Described reactance L1 is by described resistance R1 ground connection;
In described second auxiliary switching circuit, the anode of described thyristor T23 is connected with the negative pole of described diode D2, and its negative electrode is connected with one end of described reactance L2; Described electric capacity C2 one end is connected with the positive pole of described diode D2; The described electric capacity C2 other end is connected with the other end of described reactance L2; Described reactance L2 is by described resistance R2 ground connection.
Wherein, the number of the described diode D1 in described first auxiliary switching circuit, described thyristor T11 and described thyristor T13 is two or more;
The number of the described diode D2 in described second auxiliary switching circuit, described thyristor T21 and described thyristor T23 is two or more.
Wherein, the diode D2 negative pole in the diode D1 in described first valve section and described second valve section connects, and positive pole is connected with the current limiting reactor in circuit.
The present invention is based on the control method of a kind of MTDC transmission system DC circuit breaker that another object provides, its improvements are, described control method comprises the steps:
Opening process:
(1) by DC circuit breaker place in circuit, and keep thyristor T11, thyristor T21, thyristor T13, thyristor T23, thyristor T1 and thyristor T12 to be blocking, isolating switch BRK1 is open mode;
(2) the thyristor T11 in triggering and conducting first valve section;
(3) triggering and conducting thyristor T1 after closed isolating switch BRK1;
Turn off process:
1) the thyristor T13 in triggering and conducting first auxiliary switching circuit;
2) isolating switch BRK1 is disconnected;
3) charge to the electric capacity C1 of described first auxiliary switching circuit, until lightning arrestor movement absorb energy.
The present invention is based on the control method of a kind of MTDC transmission system DC circuit breaker that another object provides, its improvements are, described control method comprises the steps:
Opening process:
(1) by DC circuit breaker place in circuit, and keep thyristor T11, thyristor T21, thyristor T13, thyristor T23, thyristor T1 and thyristor T12 to be blocking, isolating switch BRK1 is open mode;
(2) the thyristor T21 in triggering and conducting second valve section;
(3) triggering and conducting thyristor T12 after closed isolating switch BRK1;
Turn off process:
1) the thyristor T23 in triggering and conducting second auxiliary switching circuit;
2) isolating switch BRK1 is disconnected;
3) charge to the electric capacity C2 of described second auxiliary switching circuit, until lightning arrestor movement absorb energy.
Compared with the prior art, beneficial effect of the present invention is:
Present invention incorporates forced commutation thought and current transfer disjunction thought, achieve the disjunction of hicap direct current.
The present invention adopts half control type device thyristor to form direct-current breaker topology, and can be applicable to high-voltage great-current occasion, cost is lower, technology maturation.
The present invention can be applicable to high-voltage great-current occasion, and topological structure is simple, and control simple and easy, autgmentability is high.
The present invention's application quick isolation switch, achieve the disjunction of multi-state bidirectional, dc electric current, breaking course is quick without arc.
The present invention utilizes auxiliary switching circuit to achieve the soft open-minded of DC circuit breaker, reduces the stress that power device opening process bears.
The present invention utilizes circuit for capacitor charging in auxiliary switch loop, does not need additionally to increase charging device, thus reduces equipment room electrical isolation difficulty, reduce floor space and cost, be easy to through engineering approaches and realize.
Accompanying drawing explanation
Fig. 1 is DC circuit breaker structure chart provided by the invention.
Fig. 2 is the waveform schematic diagram of disjunction fault current provided by the invention.
Fig. 3 is the waveform schematic diagram of 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, is connected respectively after current limiting reactor by two ends and accesses electrical network, and its structure as shown in Figure 1, mainly comprises lightning arrester in parallel successively, main switch branch road and auxiliary switching circuit.
The main switch branch road of the present embodiment comprises quick isolation switch BRK1, thyristor T1 and thyristor T12; Connect with quick isolation switch BRK1 after thyristor T1 and thyristor T12 inverse parallel, form main switch branch road.
The auxiliary switching circuit of the present embodiment comprises the first auxiliary switching circuit and the second auxiliary switching circuit, wherein: the first auxiliary switching circuit comprises thyristor T13-reactance L1 series arm, electric capacity C1, resistance R1, thyristor T11 and diode D1; Thyristor T11 and diode D1 inverse parallel form the first valve section; Thyristor T13-reactance L1 series arm and electric capacity C1 are connected in the first valve section two ends over the ground, and by resistance R1 ground connection; Second valve section is connected with the first valve section afterwards and main switch branch circuit parallel connection; Second auxiliary switching circuit comprises thyristor T23-reactance L2 series arm, electric capacity C2, resistance R2, thyristor T21 and diode D2; Thyristor T21 and diode D2 inverse parallel form the second valve section; Thyristor T23-reactance L2 series arm and electric capacity C2 are connected in the second valve section two ends over the ground, and by resistance R2 ground connection.
As shown in Figure 1, in two groups of valve sections, diode D2 and thyristor T21 inverse parallel, diode D1 and thyristor T11 inverse parallel.Wherein often organize diode D1 and D2 in valve section, the number of thyristor T11 and thyristor T21 is multiple (only by a sign in figure), and is cascaded structure.Diode D1 is contrary with diode D2 direction, and thyristor T11 is contrary with thyristor T21 direction.
For first auxiliary switching circuit at the first valve section place, the anode of thyristor T13 is connected with the negative pole of diode D1, and its negative electrode is connected with one end of reactance L1; Electric capacity C1 one end is connected with the positive pole of diode D1, the other end of the other end and reactance L1 be connected; By resistance R1 ground connection between reactance L1 and electric capacity C1, R1 plays metering function, and reactance L1 plays the effect of suppression short circuit current.Wherein thyristor T13 is also made up of the thyristor series aiding connection of at least one.
For second auxiliary switching circuit at the second valve section place, the anode of thyristor T23 is connected with the negative pole of diode D2, and its negative electrode is connected with one end of reactance L2; Electric capacity C2 one end is connected with the positive pole of diode D2, the other end of its other end and reactance L2 be connected; By another resistance R2 ground connection between reactance L2 and electric capacity C2, R2 plays metering function, and reactance L2 plays the effect of suppression short circuit current.Wherein thyristor T23 is also made up of the thyristor series aiding connection of at least one.
Corresponding, the control method of a kind of MTDC transmission system DC circuit breaker that the present embodiment proposes, because this breaker structure is symmetrical, bidirectional flow alive disjunction mechanism is identical, only get forward and do principle analysis, in the other direction can analogy, sense of current I shown in accompanying drawing 1
dcfor the positive direction of electric current.For disengagement failure short circuit current and the different operating modes cutting off load current, this circuit breaker operation principle is identical, therefore does unified explanation.The present embodiment comprises the steps:
Opening process:
Electric capacity C1 and C2 is charged by auxiliary switching circuit C1-R and C2-R and keeps normal electriferous state, and voltage stabilization is at system nominal voltage levvl.When opening, first triggering and conducting T11, electric current, by current limiting reactor 1-D2-T11 branch road, closes quick isolation switch BRK1, then triggering and conducting thyristor T1 after current stabilization, because the branch impedance of D2-T11 place is much larger than BRK1-T1 branch road, electric current can be rapidly to the transfer of BRK1-T1 branch road, and after current stabilization, current stabilization is by BRK1-T1 branch road, so far circuit breaker drops into steady operational status completely, and opening process terminates.
Turn off process:
When circuit breaker needs action disjunction direct current, triggering and conducting T13, due to the effect of capacitance voltage, capacitor C1 produces rapidly a pulse current reverse with circuit forward current in T1-BRK1--D2-T13-L1 loop, make current over-zero in thyristor T1, thyristor T1 turns off, and now quick isolation switch BRK1 is at no current situation quick acting separating brake; When quick isolation switch BRK1 recovers after blocking ability, electric current transfers to D2-T13-L1-C1 branch road completely, charge to electric capacity C1 simultaneously, makes electric capacity C1 voltage negatively just to become under upper bearing just down from upper, contrary with direction as shown.When D2-T13-L1-C1 branch voltage reaches lightning arrester MOV operation voltage, MOV action, current transfer is to MOV place branch road, and the energy stored in MOV absorption circuit and current-limiting inductance, when capacitor C1 charging current is zero, thyristor T13 turns off, quick isolation switch BRK2 separating brake, treats that in lightning arrester, electric current is decreased to 0 gradually, and lightning arrester recovers blocking state, so far flow through the complete disjunction of DC circuit breaker electric current, turn off process terminates.
As shown in Figure 2, be the waveform schematic diagram of disjunction fault current.By the manipulation of DC circuit breaker proposed the present embodiment, as can be seen from the figure, through the disjunction of 1.4ms main 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 the manipulation of DC circuit breaker proposed the present embodiment, as can be seen from the figure, through the disjunction of 1.3ms main 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 to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (3)
1. a MTDC transmission system DC circuit breaker, described DC circuit breaker comprises lightning arrester in parallel successively, main switch branch road and auxiliary switching circuit; It is characterized in that, described main switch branch road comprises isolating switch BRK1, thyristor T1 and thyristor T12; Connect with described isolating switch BRK1 after described thyristor T1 and thyristor T12 inverse parallel;
Described auxiliary switching circuit comprises the first auxiliary switching circuit and the second auxiliary switching circuit;
Described first auxiliary switching circuit comprises thyristor T13-reactance L1 series arm, electric capacity C1, resistance R1, thyristor T11 and diode D1; Described thyristor T11 and described diode D1 inverse parallel form the first valve section; Described thyristor T13-reactance L1 series arm and described electric capacity C1 are connected in described first valve section two ends over the ground, and by described resistance R1 ground connection;
Described second auxiliary switching circuit comprises thyristor T23-reactance L2 series arm, electric capacity C2, resistance R2, thyristor T21 and diode D2; Described thyristor T21 and described diode D2 inverse parallel form the second valve section; Described thyristor T23-reactance L2 series arm and described electric capacity C2 are connected in described second valve section two ends over the ground, and by described resistance R2 ground connection;
Described first valve section is connected with described second valve section afterwards and described main switch branch circuit parallel connection;
In described first auxiliary switching circuit, the anode of described thyristor T13 is connected with the negative pole of described diode D1, and its negative electrode is connected with one end of described reactance L1; Described electric capacity C1 one end is connected with the positive pole of described diode D1; The described electric capacity C1 other end is connected with the other end of described reactance L1; Described reactance L1 is by described resistance R1 ground connection;
In described second auxiliary switching circuit, the anode of described thyristor T23 is connected with the negative pole of described diode D2, and its negative electrode is connected with one end of described reactance L2; Described electric capacity C2 one end is connected with the positive pole of described diode D2; The described electric capacity C2 other end is connected with the other end of described reactance L2; Described reactance L2 is by described resistance R2 ground connection;
The number of the described diode D1 in described first auxiliary switching circuit, described thyristor T11 and described thyristor T13 is two or more;
The number of the described diode D2 in described second auxiliary switching circuit, described thyristor T21 and described thyristor T23 is two or more;
The negative pole of the diode D2 in the negative pole of the diode D1 in described first valve section and described second valve section connects, and the positive pole of described diode D1 is connected with the current limiting reactor 2 in circuit, and the positive pole of described diode D2 is connected with the current limiting reactor 1 in circuit.
2. based on a control method for MTDC transmission system DC circuit breaker according to claim 1, it is characterized in that, described control method comprises the steps:
Opening process:
(1) by DC circuit breaker place in circuit, and keep thyristor T11, thyristor T21, thyristor T13, thyristor T23, thyristor T1 and thyristor T12 to be blocking, isolating switch BRK1 is open mode;
(2) the thyristor T11 in triggering and conducting first valve section;
(3) triggering and conducting thyristor T1 after closed isolating switch BRK1;
Turn off process:
1) the thyristor T13 in triggering and conducting first auxiliary switching circuit;
2) isolating switch BRK1 is disconnected;
3) charge to the electric capacity C1 of described first auxiliary switching circuit, until lightning arrestor movement absorb energy.
3. based on a control method for MTDC transmission system DC circuit breaker according to claim 1, it is characterized in that, described control method comprises the steps:
Opening process:
(1) by DC circuit breaker place in circuit, and keep thyristor T11, thyristor T21, thyristor T13, thyristor T23, thyristor T1 and thyristor T12 to be blocking, isolating switch BRK1 is open mode;
(2) the thyristor T21 in triggering and conducting second valve section;
(3) triggering and conducting thyristor T12 after closed isolating switch BRK1;
Turn off process:
1) the thyristor T23 in triggering and conducting second auxiliary switching circuit;
2) isolating switch BRK1 is disconnected;
3) charge to the electric capacity C2 of described second auxiliary switching circuit, until lightning arrestor movement absorb energy.
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| CN104767171B (en) * | 2014-01-06 | 2018-01-19 | 国家电网公司 | A kind of high voltage DC breaker and its implementation |
| CN104979795B (en) * | 2014-04-08 | 2018-10-09 | 国家电网公司 | A kind of passive high voltage DC breaker and its implementation |
| CN104900444B (en) * | 2015-06-26 | 2017-08-04 | 华北电力大学 | The topological structure and its control method of dc circuit breaker |
| CN105958466A (en) * | 2016-05-13 | 2016-09-21 | 上海电机学院 | DC micro-grid system based on multi-port DC transformer substation |
| CN110247385B (en) * | 2019-07-16 | 2021-02-12 | 哈尔滨工业大学 | Direct-current solid-state fault current limiter with bidirectional current limiting and expanding functions, working method thereof and multi-stage current limiter |
| CN112383032B (en) * | 2020-09-30 | 2022-05-20 | 四川大学 | Thyristor-based active direct current breaker and control method thereof |
| CN114336550B (en) * | 2022-01-05 | 2024-06-21 | 全球能源互联网研究院有限公司 | Self-energy-taking multi-port direct current breaker and application method |
| CN115776099B (en) * | 2022-11-23 | 2024-03-26 | 暨南大学 | Continuous zero-crossing type direct current breaker and fault solving method |
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| CN102959818A (en) * | 2010-06-30 | 2013-03-06 | Abb技术有限公司 | An hvdc switchyard and an hvdc switchyard system |
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| KR100888147B1 (en) * | 2007-08-20 | 2009-03-13 | 한국전력공사 | Hybrid type superconducting fault current limiter |
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| CN102959818A (en) * | 2010-06-30 | 2013-03-06 | Abb技术有限公司 | An hvdc switchyard and an hvdc switchyard system |
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| "混合型限流断路器在高短路电流上升率时换流试验分析";王晨等;《电力系统自动化》;20090825;第33卷(第16期);第65-70页 * |
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