CN103457256A - Direct-current breaker used for multi-terminal direct-current system and control method thereof - Google Patents
Direct-current breaker used for multi-terminal direct-current system and control method thereof Download PDFInfo
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- CN103457256A CN103457256A CN2013103591422A CN201310359142A CN103457256A CN 103457256 A CN103457256 A CN 103457256A CN 2013103591422 A CN2013103591422 A CN 2013103591422A CN 201310359142 A CN201310359142 A CN 201310359142A CN 103457256 A CN103457256 A CN 103457256A
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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 used for the multi-terminal direct-current system. The direct-current breaker comprises a lightning arrester, a main switch branch circuit and auxiliary switch circuits. The main switch branch circuit comprises an isolating switch BRK1, a thyristor T1 and a thyristor T12. The thyristor T1 and the thyristor T12 are connected in an anti-parallel mode and then are connected with the isolating switch BRK1 in series. The auxiliary circuits comprise a first auxiliary switch circuit and a second auxiliary switch circuit which are symmetrical in structure. The first auxiliary switch circuit and the second auxiliary switch circuit are connected in series and then connected with the two ends of the main switch branch circuit in parallel. Each auxiliary switch circuit comprises a thyristor-resistor serial circuit, a capacitor, a resistor and a valve section composed of another thyristor and a diode. Direct current is made to pass a zero to be broken through a method of reverse current injection. The direct-current breaker can be applied to high-voltage large-current occasions, the topological structure of the direct-current breaker is simple, cost is low, breaking is rapid, control is easy, and losses are low.
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, described DC circuit breaker comprises lightning arrester, main switch branch road and auxiliary switching circuit in parallel successively; Its improvements are, described main switch branch road comprises isolating switch BRK1, thyristor T1 and thyristor T12; After described thyristor T1 and thyristor T12 inverse parallel, with described isolating switch BRK1, connect;
Described auxiliary switching circuit comprises the first auxiliary switching circuit and the second auxiliary switching circuit;
Described the first auxiliary switching circuit comprises thyristor T13-reactance L1 series arm, capacitor C 1, resistance R 1, 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 capacitor C 1 are connected in described the first valve section two ends over the ground, and by described resistance R 1 ground connection;
Described the second auxiliary switching circuit comprises thyristor T23-reactance L2 series arm, capacitor C 2, resistance R 2, 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 capacitor C 2 are connected in described second valve section two ends over the ground, and by described resistance R 2 ground connection;
Described the first valve section is connected with described second valve section afterwards and described main switch branch circuit parallel connection.
Wherein, in described the 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 the end of described reactance L1; 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 L1; Described reactance L1 is by described resistance R 1 ground connection;
In described the 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 the end of described reactance L2; 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 L2; Described reactance L2 is by described resistance R 2 ground connection.
Wherein, the number of the described diode D1 in described the first auxiliary switching circuit, described thyristor T11 and described thyristor T13 is more than two;
The number of described diode D2 in described the second auxiliary switching circuit, described thyristor T21 and described thyristor T23 is more than two.
Wherein, the diode D1 in described the first valve section and the diode D2 negative pole in described second valve section join, 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 control method comprises the steps:
Opening process:
(1) by the DC circuit breaker place in circuit, and to keep thyristor T11, thyristor T21, thyristor T13, thyristor T23, thyristor T1 and thyristor T12 be blocking, and isolating switch BRK1 is open mode;
(2) the thyristor T11 in triggering and conducting the 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 the first auxiliary switching circuit;
2) disconnect isolating switch BRK1;
3) give capacitor C 1 charging of described the first auxiliary switching circuit, until lightning arrestor movement absorb energy.
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 control method comprises the steps:
Opening process:
(1) by the DC circuit breaker place in circuit, and to keep thyristor T11, thyristor T21, thyristor T13, thyristor T23, thyristor T1 and thyristor T12 be blocking, and 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 the second auxiliary switching circuit;
2) disconnect isolating switch BRK1;
3) give capacitor C 2 chargings of described the second auxiliary switching circuit, until 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, can be applicable to the high-voltage great-current occasion, and cost is lower, technology maturation.
The present invention can be applicable to the high-voltage great-current occasion, and topological structure is simple, controls simple and easyly, and autgmentability 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 utilizes circuit for capacitor charging in the auxiliary switch loop, 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, connect respectively after current limiting reactor and access electrical network by two ends, and its structure as shown in Figure 1, mainly comprises lightning arrester, main switch branch road and the auxiliary switching circuit of parallel connection successively.
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 the main switch branch road.
The auxiliary switching circuit of the present embodiment comprises the first auxiliary switching circuit and the second auxiliary switching circuit, and wherein: the first auxiliary switching circuit comprises thyristor T13-reactance L1 series arm, capacitor C 1, resistance R 1, thyristor T11 and diode D1; Thyristor T11 and diode D1 inverse parallel form the first valve section; Thyristor T13-reactance L1 series arm and capacitor C 1 are connected in the first valve section two ends over the ground, and by resistance R 1 ground connection; The second valve section is connected with the first valve section afterwards and the main switch branch circuit parallel connection; The second auxiliary switching circuit comprises thyristor T23-reactance L2 series arm, capacitor C 2, resistance R 2, thyristor T21 and diode D2; Thyristor T21 and diode D2 inverse parallel form the second valve section; Thyristor T23-reactance L2 series arm and capacitor C 2 are connected in second valve section two ends over the ground, and by resistance R 2 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.Diode D1 and the D2 in every group of valve section wherein, that the number of thyristor T11 and thyristor T21 is is a plurality of (in figure only by a sign), and is cascaded structure.Diode D1 and diode D2 opposite direction, thyristor T11 and thyristor T21 opposite 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 the end of reactance L1; Capacitor C 1 one ends are connected with the positive pole of diode D1, the other end of the other end and reactance L1 be connected; Between reactance L1 and capacitor C 1, by resistance R 1 ground connection, R1 plays metering function, and reactance L1 works the short circuit current effect that suppresses.Wherein thyristor T13 also consists of the thyristor series aiding connection of at least one.
For second auxiliary switching circuit at 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 the end of reactance L2; Capacitor C 2 one ends are connected with the positive pole of diode D2, the other end of its other end and reactance L2 be connected; Between reactance L2 and capacitor C 2, by another resistance R 2 ground connection, R2 plays metering function, and reactance L2 works the short circuit current effect that suppresses.Wherein thyristor T23 also consists of the thyristor series aiding connection of at least one.
Corresponding, the control method of DC circuit breaker for a kind of MTDC transmission system that the present embodiment proposes, 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.For the different operating modes of disengagement failure short circuit current and cut-out load current, this circuit breaker operation principle is identical, therefore do unified explanation.The present embodiment comprises the steps:
Opening process:
Capacitor C 1 and C2 charge by auxiliary switching circuit C1-R and C2-R and keep normal electriferous state, and voltage stabilization is in system rated voltage level.While opening, first triggering and conducting T11, electric current is by current limiting reactor 1-D2-T11 branch road, closed quick isolation switch BRK1, then triggering and conducting thyristor T1 after current stabilization, due to the branch impedance of D2-T11 place much larger than the BRK1-T1 branch road, electric current can shift to the BRK1-T1 branch road rapidly, and after current stabilization, current stabilization is by the BRK1-T1 branch road, so far circuit breaker drops into steady operational status fully, and opening process finishes.
Turn off process:
When circuit breaker need to move the disjunction direct current, triggering and conducting T13, effect due to capacitance voltage, capacitor C1 produces rapidly a pulse current reverse with the circuit forward current in the T1-BRK1--D2-T13-L1 loop, make current over-zero in thyristor T1, thyristor T1 turn-offs, and now quick isolation switch BRK1 is at no current situation quick acting separating brake; After quick isolation switch BRK1 recovers blocking ability, electric current is transferred to the D2-T13-L1-C1 branch road fully, gives capacitor C 1 charging simultaneously, make capacitor C 1 voltage by upper just lower negative become upper negative under just, contrary with direction as shown.When the D2-T13-L1-C1 branch voltage reaches lightning arrester MOV operation voltage, the 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 turn-offs, quick isolation switch BRK2 separating brake, treat that in lightning arrester, electric current is decreased to 0 gradually, and lightning arrester recovers blocking state, so far the complete disjunction of DC circuit breaker electric current of flowing through, 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 (6)
1. a MTDC transmission system DC circuit breaker, described DC circuit breaker comprises lightning arrester, main switch branch road and auxiliary switching circuit in parallel successively; It is characterized in that, described main switch branch road comprises isolating switch BRK1, thyristor T1 and thyristor T12; After described thyristor T1 and thyristor T12 inverse parallel, with described isolating switch BRK1, connect;
Described auxiliary switching circuit comprises the first auxiliary switching circuit and the second auxiliary switching circuit;
Described the first auxiliary switching circuit comprises thyristor T13-reactance L1 series arm, capacitor C 1, resistance R 1, 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 capacitor C 1 are connected in described the first valve section two ends over the ground, and by described resistance R 1 ground connection;
Described the second auxiliary switching circuit comprises thyristor T23-reactance L2 series arm, capacitor C 2, resistance R 2, 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 capacitor C 2 are connected in described second valve section two ends over the ground, and by described resistance R 2 ground connection;
Described the first valve section is connected with described second valve section afterwards and described main switch branch circuit parallel connection.
2. DC circuit breaker as claimed in claim 1, is characterized in that, in described the 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 the end of described reactance L1; 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 L1; Described reactance L1 is by described resistance R 1 ground connection;
In described the 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 the end of described reactance L2; 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 L2; Described reactance L2 is by described resistance R 2 ground connection.
3. DC circuit breaker as claimed in claim 2, is characterized in that, the number of the described diode D1 in described the first auxiliary switching circuit, described thyristor T11 and described thyristor T13 is more than two;
The number of described diode D2 in described the second auxiliary switching circuit, described thyristor T21 and described thyristor T23 is more than two.
4. described DC circuit breaker as arbitrary as claim 1-3, is characterized in that, the diode D1 in described the first valve section and the diode D2 negative pole in described second valve section join, and positive pole is connected with the current limiting reactor in circuit.
5. the control method of a MTDC transmission system use DC circuit breaker, is characterized in that, described control method comprises the steps:
Opening process:
(1) by the DC circuit breaker place in circuit, and to keep thyristor T11, thyristor T21, thyristor T13, thyristor T23, thyristor T1 and thyristor T12 be blocking, and isolating switch BRK1 is open mode;
(2) the thyristor T11 in triggering and conducting the 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 the first auxiliary switching circuit;
2) disconnect isolating switch BRK1;
3) give capacitor C 1 charging of described the first auxiliary switching circuit, until lightning arrestor movement absorb energy.
6. the control method of a MTDC transmission system use DC circuit breaker, is characterized in that, described control method comprises the steps:
Opening process:
(1) by the DC circuit breaker place in circuit, and to keep thyristor T11, thyristor T21, thyristor T13, thyristor T23, thyristor T1 and thyristor T12 be blocking, and 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 the second auxiliary switching circuit;
2) disconnect isolating switch BRK1;
3) give capacitor C 2 chargings of described the second auxiliary switching circuit, until lightning arrestor movement absorb energy.
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Cited By (8)
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| CN104767171A (en) * | 2014-01-06 | 2015-07-08 | 国家电网公司 | High-voltage DC circuit breaker and realization method thereof |
| CN104900444A (en) * | 2015-06-26 | 2015-09-09 | 华北电力大学 | Direct current (DC) breaker topology structure and DC breaker control method |
| CN104979795A (en) * | 2014-04-08 | 2015-10-14 | 国家电网公司 | Passive high-voltage direct-current circuit breaker and implementation method therefor |
| 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 |
| CN110247385A (en) * | 2019-07-16 | 2019-09-17 | 哈尔滨工业大学 | A kind of DC solid fault current limiter having bidirectional current limiting and extension function and its working method, multistage current limiter |
| CN112383032A (en) * | 2020-09-30 | 2021-02-19 | 四川大学 | Thyristor-based active direct current circuit breaker and control method thereof |
| CN114336550A (en) * | 2022-01-05 | 2022-04-12 | 全球能源互联网研究院有限公司 | Self-energy-taking multi-port direct-current circuit breaker and application method |
| CN115776099A (en) * | 2022-11-23 | 2023-03-10 | 暨南大学 | Continuous zero-crossing type direct current breaker and fault solving method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767171A (en) * | 2014-01-06 | 2015-07-08 | 国家电网公司 | High-voltage DC circuit breaker and realization method thereof |
| CN104767171B (en) * | 2014-01-06 | 2018-01-19 | 国家电网公司 | A kind of high voltage DC breaker and its implementation |
| CN104979795A (en) * | 2014-04-08 | 2015-10-14 | 国家电网公司 | Passive high-voltage direct-current circuit breaker and implementation method therefor |
| 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 |
| CN104900444A (en) * | 2015-06-26 | 2015-09-09 | 华北电力大学 | Direct current (DC) breaker topology structure and DC breaker control method |
| 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 |
| CN110247385A (en) * | 2019-07-16 | 2019-09-17 | 哈尔滨工业大学 | A kind of DC solid fault current limiter having bidirectional current limiting and extension function and its working method, multistage current limiter |
| 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 |
| CN114336550A (en) * | 2022-01-05 | 2022-04-12 | 全球能源互联网研究院有限公司 | Self-energy-taking multi-port direct-current circuit breaker and application method |
| CN115776099A (en) * | 2022-11-23 | 2023-03-10 | 暨南大学 | Continuous zero-crossing type direct current breaker and fault solving 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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