CN103457258B - 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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- CN103457258B CN103457258B CN201310359625.2A CN201310359625A CN103457258B CN 103457258 B CN103457258 B CN 103457258B CN 201310359625 A CN201310359625 A CN 201310359625A CN 103457258 B CN103457258 B CN 103457258B
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Abstract
The present invention proposes a kind of MTDC transmission system DC circuit breaker and control method thereof, and DC circuit breaker comprises lightning arrester, main switch circuit and auxiliary switching circuit; Lightning arrester and main switch branch circuit parallel connection; Main switch branch road comprises the first interruption units and second interruption units of the identical series connection of two groups of structures; At the first interruption units and the second interruption units two ends the first auxiliary switching circuit that parallel-connection structure is identical respectively and the second auxiliary switching circuit.The valve section that auxiliary switching circuit comprises thyristor-reactance series arm, electric capacity, resistance and is made up of a thyristor and diode.The present invention makes direct current zero passage by its disjunction by the method injecting reverse 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, 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 corresponding with it.
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, direct current system is accessed after connecting reactance respectively in two ends; Described DC circuit breaker comprises lightning arrester, main switch branch road and auxiliary branch; Described lightning arrester and described main switch branch circuit parallel connection; Its improvements are,
Described main switch branch road comprises the first interruption units and second interruption units of the identical series connection of two groups of structures; The first auxiliary switching circuit is arranged in parallel at described first interruption units two ends; The second auxiliary switching circuit is arranged in parallel at described second interruption units two ends;
Described 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, in parallel with described first interruption units; 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; Thyristor T21 and diode D2 inverse parallel form the second valve section, in parallel with described second interruption units; 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.
Wherein, described first interruption units comprises isolating switch BRK1, thyristor T1 and thyristor T12;
Connect with described isolating switch BRK1 after described thyristor T1 and described thyristor T12 inverse parallel;
Described second interruption units comprises isolating switch BRK2, thyristor T2 and thyristor T22;
Connect with described isolating switch BRK2 after described thyristor T2 and described thyristor T22 inverse parallel.
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 keeping thyristor T1, thyristor T2, thyristor T12, thyristor T22, thyristor T11, thyristor T21, thyristor T13 and thyristor T23 to be blocking, isolating switch BRK1 and isolating switch BRK2 is open mode;
(2) the isolating switch BRK1 in closed first interruption units, and trigger the thyristor T1 in described first interruption units;
(3) the isolating switch BRK2 in closed second interruption units, and trigger the thyristor T2 in described second interruption units;
Turn off process:
1) the thyristor T13 in triggering and conducting first auxiliary switching circuit;
2) the isolating switch BRK1 in described first interruption units is disconnected;
3) lightning arrestor movement absorb energy;
4) the isolating switch BRK2 in described second interruption units is disconnected.
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 keeping thyristor T1, thyristor T2, thyristor T12, thyristor T22, thyristor T11, thyristor T21, thyristor T13 and thyristor T23 to be blocking, isolating switch BRK1 and isolating switch BRK2 is open mode;
(2) the isolating switch BRK2 in closed second interruption units, and trigger the thyristor T22 in described second interruption units;
(3) the isolating switch BRK1 in closed first interruption units, and trigger the thyristor T12 in described first interruption units;
Turn off process:
1) the thyristor T23 in triggering and conducting second auxiliary switching circuit;
2) the isolating switch BRK2 in described second interruption units is disconnected;
3) lightning arrestor movement absorb energy;
4) the isolating switch BRK1 in described first interruption units is disconnected.
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 utilize half control type device to replace expensive wholly-controled device, on-state loss is low, manufacturing cost and cooling requirements lower, technology maturation.
The present invention can be applicable to high-voltage great-current occasion, and topological structure is simply compact, and control simple and easy, extensibility 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 invention belongs to mixed type high voltage DC breaker, combine mechanical type DC circuit breaker and the advantage both solid-state direct-current circuit breaker, research and development difficulty is relatively little, is applicable to various MTDC transmission system.
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, it is connected respectively after current limiting reactor by two ends and accesses electrical network, and its structure as shown in Figure 1, comprises lightning arrester, main switch branch road and auxiliary switching circuit; Its lightning arrester and main switch branch circuit parallel connection.
The main switch branch road of the present embodiment comprises the first identical interruption units of two groups of structures and the second interruption units; First interruption units comprises isolating switch BRK1, thyristor T1 and thyristor T12; Connect with isolating switch BRK1 after thyristor T1 and thyristor T12 inverse parallel; Second interruption units comprises isolating switch BRK2, thyristor T2 and thyristor T22; Connect with isolating switch BRK2 after thyristor T2 and thyristor T22 inverse parallel.First interruption units and the series connection of the second interruption units, form main switch branch road.The present embodiment is arranged in parallel the first auxiliary switching circuit at the first interruption units two ends; The second auxiliary switching circuit is arranged in parallel at the second interruption units two ends.
As shown in Figure 1, 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, in parallel with the first interruption units; 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 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, in parallel with the second interruption units; 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.
In Fig. 1, in two groups of valve sections, diode D2 and thyristor T21 inverse parallel, diode D1 and thyristor T11 inverse parallel.Diode D1 and D2 wherein in every section of 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 reactance L1; The other end of reactance L1 is connected with one end of electric capacity C1, and the other end of electric capacity C1 is connected with the positive pole of diode D1, and 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 reactance L2; The other end of reactance L2 is connected with one end of electric capacity C2, and the other end of electric capacity C2 is connected with the positive pole of diode D2, and 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 present embodiment proposes a kind of control method of MTDC transmission system DC circuit breaker, because the breaker structure of the present embodiment 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 utilizes circuit charged by auxiliary switching circuit C1-R and C2-R and keep normal electriferous state, and voltage stabilization is at system nominal voltage levvl.When opening, first closed quick isolation switch BRK1, then triggering and conducting T1, electric current is by D2-BRK1-T1 branch road, closed quick isolation switch BRK2 after current stabilization, then triggering and conducting thyristor T2, because the branch impedance of D2 place is much larger than T2 branch road, electric current can be rapidly to the transfer of BRK2-T2-BRK1-T1 branch road, after current stabilization, current stabilization is by BRK2-T2-BRK1-T1 branch road, and so far circuit breaker drops into steady operational status completely, and opening process terminates.
Turn off process:
When circuit breaker needs action breaking 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 C1-T1-BRK1-T13-L1 loop, make current over-zero in thyristor T1, because D1 conducting provides reverse voltage to T1, thyristor T1 turns off, and now Quick mechanical isolating switch BRK1 is at no current situation quick acting separating brake; When BRK1 recovers after blocking ability, electric current transfers to BRK2-T2-T13-L1-C1 branch road completely, charge to capacitor C1 simultaneously, makes electric capacity C1 voltage negatively just to become under upper bearing just down from upper, contrary with direction as shown.When this 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, 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 (6)
1. a MTDC transmission system DC circuit breaker, direct current system is accessed after connecting reactance respectively in two ends; Described DC circuit breaker comprises lightning arrester, main switch branch road and auxiliary branch; Described lightning arrester and described main switch branch circuit parallel connection; It is characterized in that,
Described main switch branch road comprises the first interruption units and second interruption units of the identical series connection of two groups of structures; The first auxiliary switching circuit is arranged in parallel at described first interruption units two ends; The second auxiliary switching circuit is arranged in parallel at described second interruption units two ends;
Described 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, in parallel with described first interruption units; 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; Thyristor T21 and diode D2 inverse parallel form the second valve section, in parallel with described second interruption units; 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;
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.
2. DC circuit breaker as claimed in claim 1, it is characterized in that, described first interruption units comprises isolating switch BRK1, thyristor T1 and thyristor T12;
Connect with described isolating switch BRK1 after described thyristor T1 and described thyristor T12 inverse parallel;
Described second interruption units comprises isolating switch BRK2, thyristor T2 and thyristor T22;
Connect with described isolating switch BRK2 after described thyristor T2 and described thyristor T22 inverse parallel.
3. DC circuit breaker as claimed in claim 2, it is characterized in that, 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.
4. the DC circuit breaker as described in as arbitrary in claim 1-3, is characterized in that, the diode D2 negative pole in the diode D1 negative pole in described first valve section and described second valve section connects, and the positive pole of D1, D2 is connected with the current limiting reactor in circuit.
5. for a control method for DC circuit breaker as claimed in claim 1, it is characterized in that, described control method comprises the steps:
Opening process:
(1) by DC circuit breaker place in circuit, and keeping thyristor T1, thyristor T2, thyristor T12, thyristor T22, thyristor T11, thyristor T21, thyristor T13 and thyristor T23 to be blocking, isolating switch BRK1 and isolating switch BRK2 is open mode;
(2) the isolating switch BRK1 in closed first interruption units, the thyristor T1 in triggering and conducting first interruption units;
(3) the isolating switch BRK2 in closed second interruption units, the thyristor T2 in triggering and conducting second interruption units;
Turn off process:
1) the thyristor T13 in triggering and conducting first auxiliary switching circuit;
2) the isolating switch BRK1 in described first interruption units is disconnected;
3) lightning arrestor movement absorb energy;
4) the isolating switch BRK2 in described second interruption units is disconnected.
6. for a control method for DC circuit breaker as claimed in claim 1, it is characterized in that, described control method comprises the steps:
Opening process:
(1) by DC circuit breaker place in circuit, and keeping thyristor T1, thyristor T2, thyristor T12, thyristor T22, thyristor T11, thyristor T21, thyristor T13 and thyristor T23 to be blocking, isolating switch BRK1 and isolating switch BRK2 is open mode;
(2) the isolating switch BRK2 in closed second interruption units, the thyristor T22 in triggering and conducting second interruption units;
(3) the isolating switch BRK1 in closed first interruption units, the thyristor T12 in triggering and conducting first interruption units;
Turn off process:
1) the thyristor T23 in triggering and conducting second auxiliary switching circuit;
2) the isolating switch BRK2 in described second interruption units is disconnected;
3) lightning arrestor movement absorb energy;
4) the isolating switch BRK1 in described first interruption units is disconnected.
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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 |
CN104979796B (en) * | 2015-06-10 | 2018-05-04 | 许继集团有限公司 | A kind of precharge type high speed d-c circuit breaker and its control method |
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 |
CN105870877B (en) * | 2016-03-14 | 2019-12-13 | 全球能源互联网研究院 | passive hybrid direct current breaker based on thyristor and application method thereof |
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