CN103632895A - Direct-current circuit breaker - Google Patents
Direct-current circuit breaker Download PDFInfo
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- CN103632895A CN103632895A CN201310646936.7A CN201310646936A CN103632895A CN 103632895 A CN103632895 A CN 103632895A CN 201310646936 A CN201310646936 A CN 201310646936A CN 103632895 A CN103632895 A CN 103632895A
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- combined loop
- leading
- out terminal
- current path
- initial current
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/548—Electromechanical and static switch connected in series
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
- H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle for interrupting dc
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/025—Disconnection after limiting, e.g. when limiting is not sufficient or for facilitating disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
- H01H33/16—Impedances connected with contacts
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A direct-current circuit breaker consists of an initial current passage (23), a first combination loop (21) and a second combination loop (22), wherein a first leading-out terminal of the initial current passage (23) is connected with a second leading-out terminal of the first combination loop (21); a second leading-out terminal of the initial current passage (23) is connected with a first leading-out terminal of the second combination loop (22); the first leading-out terminal of the first combination loop (21) serves as a first leading-out terminal of the direct-current circuit breaker and is connected with a direct-current power transmission line; and the second leading-out terminal of the second combination loop (22) serves as a second leading-out terminal of the direct-current circuit breaker and is connected with the other end of the direct-current power transmission line. When a high-voltage direct-current power transmission circuit is failed, the failed power transmission circuit can be switched off quickly by the direct-current circuit breaker.
Description
Technical field
The present invention relates to a kind of circuit breaker, be specifically related to a kind of direct current interruption topology and control method thereof.
Background technology
Fast DC Circuit Breaker is one of key equipment guaranteeing direct current transmission and distribution system and direct current network system stability safe and reliable operation.With AC system difference being, there is not natural zero-crossing point in the electric current of direct current system, so in direct current system, cannot as AC system, utilize the natural zero-crossing point of electric current to turn-off, so the problem of cut-offfing of direct current is a problem that is worth research always.
Breaking direct current has two kinds of modes conventionally at present, and the first is pure power electronics circuit breaker, and the patent CN102870181A as ABB application, utilizes the high-power power electronic device of turn-offing, directly disjunction direct current.The solid circuit breaker that utilizes this principle to manufacture, although can meet in time the requirement of multiterminal flexible direct current system, the loss when normally is excessive, economy is poor.
The second is to mix circuit breaker technology, on the basis of traditional interchange mechanical chopper, by increasing auxiliary Power Electronic Circuit, drop into current-limiting resistance with reduce short circuit current or on the direct current that cut-offs arc gap superimposed oscillation electric current, while utilizing current over-zero, cut-off circuit.The hybrid circuit breaker that utilizes this principle to manufacture, it has specific (special) requirements to mechanical switch, the more difficult requirement that meets DC transmission system on break-time.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, propose a kind of hybrid DC circuit breaker.When the present invention has steady operation, loss is little, while there is short trouble, without arc cutting, responds the features such as rapid.
DC circuit breaker topological structure of the present invention comprises: initial current path, the first combined loop and the second combined loop.The first leading-out terminal of initial current path is connected with the second leading-out terminal of the first combined loop, and the second leading-out terminal of initial current path is connected with the first leading-out terminal of the second combined loop.The first leading-out terminal of the first combined loop is connected with DC transmission line as the first leading-out terminal of DC circuit breaker, and the second leading-out terminal of the second combined loop is connected with the other end of DC transmission line as the second leading-out terminal of DC circuit breaker.Initial current path has multiple composition form, and for example mechanical switch module is connected with electronic power switch module, the series connection of mechanical switch module, electronic power switch module series connection etc.
After line short fault being detected, start immediately to cut off initial current path; Disconnect completely before initial current path, the first combinational circuit and the second combinational circuit make initial current path two ends potential difference brought in lower level, and the first combinational circuit and the second combinational circuit can be respectively fault current afterflow path is provided, so that initial current path disconnects; After initial current path disconnects completely, fault current is respectively by the first combinational circuit and the second combinational circuit afterflow, and gradually decay or oscillatory extinction to zero or by the first combinational circuit and the built-in switch of the second combined electrical in current zero-crossing point disjunction respectively.
Described initial current path comprises electric power electronic module and mechanical switch module; The first described combined loop comprises an inductance, an electric capacity and a built-in mechanical switch, the second described combined loop comprises an inductance, electric capacity and charging circuit thereof, charging circuit comprises charging circuit built-in switch and charging circuit resistance, the built-in switch of the second combined loop charging circuit can be comprised of mechanical switch module, also can be comprised of electronic power switch module.Mechanical switch module in described initial current path comprises at least one mechanical switch series component, and the electric power electronic module in described initial current path comprises that the power electronics of at least one controls device series component entirely; One end of mechanical switch module is connected with one end of electric power electronic module, and the other end of mechanical switch module is as the first leading-out terminal of initial current path; The other end of electric power electronic module, as the second leading-out terminal of initial current path, is connected with the first leading-out terminal of the second combined loop; First described combined loop inductance one end is connected with DC transmission line as the first leading-out terminal of the first combined loop; The other end of the first described combined loop inductance is connected with one end of the first combined loop electric capacity, as the second leading-out terminal of the first combined loop, is connected with the first leading-out terminal of initial current path; The other end of the first combined loop electric capacity is as the direct ground connection of three terminal or the connection neutral line of the first combined loop; Second described combined loop charging circuit built-in switch one end is connected the first leading-out terminal as the second combined loop charging circuit with second combined loop charging circuit resistance one end, and the described second combined loop charging circuit built-in switch other end and the second combined loop charging circuit resistance other end are as the second leading-out terminal of the second combined loop charging circuit; Second combined loop inductance one end is connected the first leading-out terminal as the second combined loop with second combined loop charging circuit the first leading-out terminal, the second leading-out terminal of described the second combined loop charging circuit is connected with electric capacity one end, and the other end of the second combined loop inductance is as the second leading-out terminal of the second combined loop; The other end of the second combined loop electric capacity is as the direct ground connection of three terminal or the connection neutral line of the second combined loop; The second leading-out terminal of initial current path is connected with the second leading-out terminal of the first combined loop, and the second leading-out terminal of initial current path is connected with the first leading-out terminal of the second combined loop.
When DC power transmission line fault-free, the mechanical switch module of described initial current path and electric power electronic module are all in closure state, when the electric current flowing through on the second combined loop inductance or the first combined loop inductance being detected surpasses limit value, first electric power electronic module disconnects, then mechanical switch module disconnects rapidly, disconnect afterwards built-in switch, to cut-off respectively the first combined loop and the second combined loop when the current zero-crossing point, thereby realize cut-offfing faulty line; The another kind of mode of mechanical switch module and electric power electronic module disconnection order is: when the electric current flowing through on the second combined loop inductance or the first combined loop inductance being detected surpasses limit value, first mechanical switch module disconnects, then electric power electronic module disconnects rapidly, disconnect afterwards built-in switch, to cut-off respectively the first combined loop and the second combined loop when the current zero-crossing point, thereby realize cut-offfing faulty line.
The present invention can optionally increase electric capacity pre-charge circuit in one end of the first combined loop inductance and the second leading-out terminal of the first combined loop, or between the first leading-out terminal of the second combined loop and one end of the second combined loop electric capacity, optionally increases the pre-charge circuit of electric capacity.
The present invention also can be at initial current path two ends shunt capacitance optionally.
The present invention can be at the first combined loop electric capacity two ends and the second combined loop electric capacity two ends voltage limiter in parallel, limiting capacitance both end voltage, thus avoid capacitor to damage because of overvoltage; Also can be at the two ends of initial current path voltage limiter in parallel, thereby avoid initial current path to damage because of overvoltage.Or be connected in series voltage limiter between the first combined loop and the second combined loop.
The another kind of implementation of the first described combined loop, for only comprising an electric capacity and built-in mechanical switch, replaces inductance by DC transmission line.
The another kind of frame mode of the first described combined loop is for only comprising a built-in mechanical switch, and electric capacity can remove, and by DC transmission line, replaces inductance.
Described initial current path only comprises mechanical switch module, and available power transmission line replaces electric power electronic module.
Described initial current path only comprises electronic power switch module, and available power transmission line replaces mechanical switch module; At this, electronic power switch module can with many groups entirely control switch module form, also available one group entirely control switch module and form with many group half control switch modules, also can be formed by half-bridge or full-bridge subelement module-cascade structure.
It is that the symmetrical version of installing of reference point is applicable to bipolarity transmission line that the topological structure of DC circuit breaker of the present invention be take the neutral line or earth point.
Inductance in the present invention's the first combined loop and the second combined loop and electric capacity form a single order passive network structure, but be not limited in a stage structure, be not limited in and only comprise an inductance and an electric capacity, can form multistage similar structure by a plurality of inductance and electric capacity or resistance and link together and replace electric capacity and the inductance in the first combined loop and the second combined loop herein.
The another kind of implementation of described initial current path is: initial current path the first switch element and the cascade of one or more capacitance switch combinational circuit, consist of.Described capacitance switch combinational circuit is by capacitor cell, switch element, and pre-charge resistance, pre-charge resistance by-pass switch forms.Described pre-charge resistance one end is connected with electric capacity one end, the capacitor cell other end is connected with ground or the bipolarity direct current transportation neutral line, the pre-charge resistance other end is connected with switch element as capacitance switch combinational circuit one end leading-out terminal, the other end of switch element is as capacitance switch combinational circuit other end leading-out terminal, and pre-charge resistance by-pass switch is connected in parallel on pre-charge resistance two ends.Described switch element can be the unit switch that mechanical switch, electronic power switch or mechanical switch combine with power electronics.
When DC transmission system is normally moved, all switch elements of all capacitance switch combinational circuits in described initial current path are all in conducting state.When short trouble appears in circuit, the switch element in the capacitance switch combinational circuit in described initial current path and initial current path the first switch element cut-off in turn or cut-off simultaneously; Final the first combined loop and two current circuits of the second combined loop of forming, the DC circuit breaker turn off process when not adding capacitance switch combinational circuit of turn off process is thereafter identical.
The second described combined loop current oscillation decays to zero, according to the second known combined loop inductance value and the second combined loop capacitance, and current oscillation decays to zero transient process, can extrapolate short-circuit impedance now, can be used for extrapolating the position of short dot, carry out fault location.
Advantage of the present invention:
A. this DC circuit breaker topology is cut-off more rapidly, can realize zero electric arc and cut-off;
B. whole change of current topology can adopt conventional components, and manufacture difficulty is relatively little, and reliability is high;
C. this DC circuit breaker can be controlled at short circuit current lower level, thus protection system fail safe;
D. this DC circuit breaker topology can reduce the impact of short circuit current on current conversion station;
E. be more easily combined with flexible DC power transmission system, be suitable for integrated design;
Loss while f. comparing system normal operation with pure electronic power switch formula DC circuit breaker is less;
G. this circuit breaker can also be for maintaining the normal state Enhancement of Transient Voltage Stability in when operation.
H. this circuit breaker can also position detection to the short dot of permanent short trouble.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is the circuit theory diagrams in specific embodiments of the invention 1;
Fig. 3 is the circuit theory diagrams in specific embodiments of the invention 2;
Fig. 4 is the circuit theory diagrams in specific embodiments of the invention 3;
Fig. 5 is the circuit theory diagrams in specific embodiments of the invention 4;
Fig. 6 is the circuit theory diagrams in specific embodiments of the invention 5;
Fig. 7 is the circuit theory diagrams in specific embodiments of the invention 6;
Fig. 8 is the circuit theory diagrams in specific embodiments of the invention 7;
Fig. 9 is the circuit theory diagrams in specific embodiments of the invention 8;
Figure 10 is the circuit theory diagrams in specific embodiments of the invention 9;
Figure 11 is the circuit theory diagrams in specific embodiments of the invention 10;
Figure 12 is the circuit theory diagrams in specific embodiments of the invention 11;
Figure 13 is the circuit theory diagrams in specific embodiments of the invention 12.
Embodiment
Below in conjunction with the drawings and the specific embodiments, the invention will be further described.
As shown in Figure 1, the present invention includes initial current path 23, the first combined loop 21 and the second combined loop 22.The first leading-out terminal of initial current path 23 is connected with the second leading-out terminal of the first combined loop 21, the second leading-out terminal of initial current path 23 is connected with the first leading-out terminal of the second combined loop, the first leading-out terminal of the first combined loop is connected with DC transmission line as the first leading-out terminal 1 of DC circuit breaker, and the second leading-out terminal of the second combined loop is connected with the other end of DC transmission line as the second leading-out terminal 6 of DC circuit breaker.
Figure 2 shows that embodiments of the invention 1.As shown in Figure 2, DC power supply 24 is current conversion station, and resistance 25 is short-circuit resistance.The basic structure of direct current interruption topology of the present invention comprises: initial current path 23, the first combined loop 21, the second combined loop 22 and voltage limiter 15.Described initial current path comprises electric power electronic module 13 and mechanical switch module 12; The first described combined loop comprises an inductance 11 and an electric capacity 16, and the second described combined loop comprises an inductance 14, electric capacity 17, capacitor charging circuit built-in switch 5,0 and a capacitor charging circuit resistance 49.
Described initial current path comprises electric power electronic module 13 and mechanical switch module 12; The first described combined loop comprises an inductance 11, electric capacity 16 and a built-in mechanical switch 61, the second described combined loop comprises an inductance 14, electric capacity 17 and a charging circuit thereof, and described charging circuit is comprised of built-in switch 49 and resistance 50; Mechanical switch module 12 in described initial current path comprises at least one mechanical switch series component, and the electric power electronic module 13 in described initial current path comprises that the power electronics of at least one controls device series component entirely; One end of mechanical switch module 12 is connected with one end of electric power electronic module 13, and the other end of mechanical switch module 12 is as the first leading-out terminal of initial current path; The other end of electric power electronic module, as the second leading-out terminal of initial current path, is connected with the first leading-out terminal of the second combined loop 22; One end of the first described combined loop inductance 11 is connected with DC transmission line as the first leading-out terminal 1 of the first combined loop; The other end of the first described combined loop inductance 11 is connected with one end of the first combined loop electric capacity 16, as the second leading-out terminal 2 of the first combined loop 21 and the first leading-out terminal of initial current path 23, is connected; The other end of the first combined loop electric capacity 16 is as three terminal 8 direct ground connection or the connection neutral line of the first combined loop; Second described combined loop charging circuit built-in switch 49 one end are connected the first leading-out terminal 101 as the second combined loop charging circuit with second combined loop charging circuit resistance 50 one end, and described second combined loop charging circuit built-in switch 49 other ends and second combined loop charging circuit resistance 50 other ends are as the second leading-out terminal 102 of the second combined loop charging circuit; One end of the second combined loop inductance 14 is connected the first leading-out terminal 3 as the second combined loop 22 with second combined loop charging circuit the first leading-out terminal 101, the second leading-out terminal 102 of described the second combined loop charging circuit is connected with one end of electric capacity 17, and the other end of the second combined loop inductance 14 is as the second leading-out terminal of the second combined loop 22; The other end of the second combined loop electric capacity 17 is as three terminal 7 direct ground connection or the connection neutral line of the second combined loop 22; The second leading-out terminal of initial current path 23 is connected with the second leading-out terminal 2 of the first combined loop 21, and the second leading-out terminal of initial current path 23 is connected with the first leading-out terminal 3 of the second combined loop 22.
One end of described voltage limiter 15 is connected with the first leading-out terminal 2 of the first combined loop, and the other end of voltage limiter is connected with the first leading-out terminal 3 of the second combined loop.Voltage limiter has multiple implementation, as nonlinear resistance ZnO flow restricter etc.;
When DC power transmission line does not have short-circuit conditions to occur, the mechanical switch module 12 of described initial current path and electric power electronic module 13 are all in closure state, when the electric current flowing through on short circuit state concussion current path inductance 14 being detected surpasses limit value, first electric power electronic module 13 disconnects, then mechanical switch module 12 disconnects rapidly, when the voltage between the second leading-out terminal 2 of the first combined loop and the first leading-out terminal 3 of the second combined loop surpasses the operation voltage of voltage limiter 15, voltage limiter 15 actions, consume the excess energy storing on upper the first combined loop inductance.
Figure 3 shows that embodiments of the invention 2.The two ends of the electric capacity 53 in Fig. 3 are connected to the two ends in initial current loop 23.
Figure 4 shows that embodiments of the invention 3, between first combined loop the second leading-out terminal 2 and one end 33 of the first combined loop electric capacity, add electric capacity pre-charge circuit 41, pre-charge circuit 41 is by pre-charge resistance 44, precharge switch 45 and precharge by-pass switch 46 form, one end of pre-charge resistance 44 is connected with one end of precharge switch 45, the other end of pre-charge resistance 44 is connected with precharge by-pass switch 46 one end as the first leading-out terminal of pre-charge circuit 41, the other end of precharge switch 45 is connected with the other end of precharge by-pass switch 46 as the second leading-out terminal of pre-charge circuit 41.When system just starts, precharge switch 45 closures, precharge by-pass switch 46 disconnects, and short circuit state concussion current path electric capacity and the first combined loop electric capacity are carried out to precharge, and after having charged, precharge switch 45 disconnects, precharge by-pass switch 46 closures.
Between second combined loop the first leading-out terminal 3 and one end 32 of the second combined loop electric capacity, add electric capacity pre-charge circuit 52, pre-charge circuit 52 is by pre-charge resistance 50, precharge switch 51, form with precharge by-pass switch 49, one end of pre-charge resistance 50 is connected with one end of precharge switch 51, the other end of pre-charge resistance 50 is connected with precharge by-pass switch 49 one end as the first leading-out terminal of pre-charge circuit 52, and the other end of precharge switch 51 is connected with the other end of precharge by-pass switch 49 as the second leading-out terminal of pre-charge circuit 52.When system just starts, precharge switch 51 closures, precharge by-pass switch 49 disconnects, and the second combined loop electric capacity is carried out to precharge, and after having charged, precharge switch 51 disconnects, precharge by-pass switch 49 closures.
Fig. 5 is embodiments of the invention 4, in the two ends parallel connection of the first combined loop electric capacity voltage limiter 47, in the two ends parallel connection of the second combined loop electric capacity voltage limiter 48.When the first combined loop electric capacity both end voltage surpasses limit value, voltage limiter 47 dissipates excess energy, limits the first combined loop electric capacity both end voltage.When the second combined loop electric capacity both end voltage surpasses limit value, voltage limiter 48 dissipates excess energy, limits the second combined loop electric capacity both end voltage, the two ends of initial current path are also in parallel voltage limiter 15.
Embodiment 5
Fig. 6 is embodiments of the invention 5.Because current conversion station is generally furnished with reactor, and itself has inductive effect circuit, can replace inductance 11 and the inductance 14 in embodiment 1 with current conversion station, therefore the inductance of the first combined loop replaces by DC transmission line 55, and the first combined loop only comprises an electric capacity;
Fig. 7 is the embodiment of further application of the invention and the two-way operating mode that opens circuit, and adopts special machine circuit breaker, the electric power electronic module 13 that can replace in embodiment 1 by DC transmission line 57, mechanical chopper bi-directional failure electric current capable of blocking;
The embodiment of Fig. 8 during as further application of the invention and bipolarity flexible DC power transmission, the first leading-out terminal 61 of the first circuit breaker 60 is connected with the positive pole of bipolar transmission line, the second leading-out terminal 62 of the first circuit breaker 60 is connected with simulation short-circuit resistance one end, and three terminal 66 of the first circuit breaker 60 is connected with ground with the 4th leading-out terminal 67.The first leading-out terminal 63 of the second circuit breaker 65 is connected with the negative pole of bipolar transmission line, the second leading-out terminal 64 of the second circuit breaker 65 is connected with the other end of simulation short-circuit resistance, and three terminal 68 of the second circuit breaker is connected with ground with the 4th leading-out terminal 69.
Fig. 9 is as the embodiment of further application of the invention and the two-way operating mode that opens circuit, electric power electronic module 70 in initial current path 73 entirely controls device cascaded structure 71 by mutual the first reverse power electronics of employing and the second power electronics is controlled device cascaded structure 72 entirely, electric current that can conducting both direction, and the fault current of both direction capable of blocking; Realize bidirectional protective function.
Figure 10 is as embodiments of the invention 9, and initial current path is only comprised of electric power electronic module 223, and electric power electronic module is composed in series by a plurality of full-control type devices, possesses turn-off speed faster.
Figure 11 is as embodiments of the invention 10, initial current path is only comprised of electric power electronic module 223, electric power electronic module is comprised of full-control type device serial module structure 214 and half control type device serial module structure 215, full-control type device serial module structure and half control type device serial module structure two ends are all in parallel pressure limiting device; Described full-control type device serial module structure 214 is composed in series by the full-control type device of at least one, as IGBT, and IGCT etc.; Half control type device serial module structure 215 is composed in series by the half control type device of at least one, as thyristor etc.When there is short trouble in system, half control type device serial module structure 215 is received cut-off signals with full-control type device serial module structure 215 simultaneously, full-control type device serial module structure 215 directly turn-offs, the electric current of flowing through on initial current path was blocked by moment, and half control type device serial module structure 215 current over-zeros turn-off naturally.
Figure 12 is as embodiments of the invention 11, initial current path is only comprised of electric power electronic module 223, electric power electronic module is comprised of full-control type device differential concatenation module 216 and half control type device inverse parallel module 216, and half control type device inverse parallel module 216 anti-parallel thyristors by least one are composed in series.Described DC circuit breaker possesses bi-directional failure current blocking ability.
Figure 13 is as embodiments of the invention 12, and initial current path 23 is by the first switch element 323, initial current path the first capacitance switch combinational circuit 133, and initial current path the second capacitance switch combinational circuit 233 forms.The first capacitance switch combinational circuit 133 is by switch element 123, capacitor cell 317, pre-charge resistance 150, pre-charge resistance by-pass switch 149 forms, the first leading-out terminal that one end of precharge by-pass switch is connected with one end of switch element 123 as the first capacitance switch combinational circuit is connected with one end of initial current channel selector unit 323, the other end of precharge by-pass switch is connected with one end of the first capacitance switch combinational circuit electric capacity 317, and the other end of the first capacitance switch combinational circuit electric capacity 317 is connected with ground.Pre-charge resistance is connected in parallel on the two ends of pre-charge resistance by-pass switch, and the other end of the first capacitance switch combinational circuit 133 switch modules 123 is connected with the first leading-out terminal of the second capacitance switch combinational circuit 233.
The second capacitance switch combinational circuit 233 is by switch element 223, capacitor cell 417, pre-charge resistance 250, pre-charge resistance by-pass switch 249, the first leading-out terminal that one end of precharge by-pass switch 249 is connected as the second capacitance switch combinational circuit with one end of switch module 223 is connected with one end of the second capacitance switch combinational circuit, the other end of precharge by-pass switch is connected with one end of the second capacitance switch combinational circuit electric capacity 417, and the other end of the second capacitance switch combinational circuit electric capacity 417 is connected with ground.Pre-charge resistance is connected in parallel on the two ends of pre-charge resistance by-pass switch, and second other end of capacitance switch combinational circuit 233 switch modules 223 and the first leading-out terminal of the second combinational circuit are connected.
When DC transmission system is normally moved, initial current path the first switch element 323, the first capacitance switch combinational circuit switch element 123, the second capacitance switch combinational circuit switch element 223 is all in closure state, when DC power transmission line short trouble being detected, initial current path the first switch element 323 disconnects, and then the first capacitance switch combination current switch element 123 disconnects, and then the second capacitance switch combinational circuit switch element 223 disconnects.The electric current of nearly rotary substation 24 is flowed through the first combined loop inductance to the first combined loop capacitor charging, and the first combined loop capacitance voltage rises and the final short circuit current that suppresses makes it decay to gradually zero.The current in the short second combined loop electric capacity of flowing through, the second combined loop inductance, transmission line, short dot 25 form loops, and final concussion decays to zero.
Claims (13)
1. a DC circuit breaker, is characterized in that: described DC circuit breaker is by initial current path (23), and the first combined loop (21) and the second combined loop (22) form; The first leading-out terminal of initial current path (23) is connected with the second leading-out terminal of the first combined loop (21), and the second leading-out terminal of initial current path (23) is connected with the first leading-out terminal of the second combined loop (22); The first leading-out terminal of the first combined loop (21) is connected with DC transmission line as the first leading-out terminal of DC circuit breaker, and the second leading-out terminal of the second combined loop (22) is connected with the other end of DC transmission line as the second leading-out terminal of DC circuit breaker.
2. according to DC circuit breaker claimed in claim 1, it is characterized in that: after line short fault being detected, start immediately to cut off initial current path (23); Disconnect completely before initial current path (23), the first combinational circuit (21) and the second combinational circuit (22) make initial current path (23) two ends potential difference brought in lower level, and the first combinational circuit (21) and the second combinational circuit (22) are respectively fault current provides afterflow path, so that initial current path (23) disconnects; After initial current path (23) disconnects completely, fault current is respectively by the first combinational circuit (21) and the second combinational circuit (22) afterflow, and gradually decay or oscillatory extinction to zero or by the built-in switch of the first combinational circuit (21) and the second combinational circuit (22) in the disjunction of current zero-crossing point difference.
3. according to DC circuit breaker claimed in claim 1, it is characterized in that: described initial current path (23) comprises electric power electronic module (13) and mechanical switch module (12), the first described combined loop comprises an inductance (11), an electric capacity (16) and a built-in mechanical switch (61), the second described combined loop comprises an inductance (14), an electric capacity (17) and charging circuit thereof, and described charging circuit is comprised of built-in switch (49) and resistance (50), the built-in switch (49) of the second described combined loop charging circuit is comprised of mechanical switch module or electronic power switch module, mechanical switch module (12) in described initial current path comprises at least one mechanical switch series component, and the electric power electronic module (13) in described initial current path comprises that the power electronics of at least one controls device series component entirely, one end of mechanical switch module (12) is connected with one end of electric power electronic module (13), and the other end of mechanical switch module (12) is as the first leading-out terminal of initial current path, the other end of electric power electronic module, as the second leading-out terminal of initial current path, is connected with the first leading-out terminal of the second combined loop (22), first described combined loop inductance (11) one end is connected with DC transmission line as first leading-out terminal (1) of the first combined loop, the other end of the first described combined loop inductance (11) is connected with one end of the built-in mechanical switch of the first combined loop (61), the other end of built-in mechanical switch (61) is connected with one end of electric capacity (16), as second leading-out terminal (2) of the first combined loop (21), be connected with the first leading-out terminal of initial current path (23), the other end of the first combined loop electric capacity (16) is as the direct ground connection of three terminal (8) or the connection neutral line of the first combined loop, one end of the built-in switch (49) of the second described combined loop charging circuit is connected the first leading-out terminal (101) as the second combined loop charging circuit with one end of the second combined loop charging circuit resistance (50), the other end of the other end of the built-in switch of the second combined loop charging circuit (49) and the second combined loop charging circuit resistance (50) is as second leading-out terminal (102) of the second combined loop charging circuit, one end of the second combined loop inductance (14) is connected with second combined loop charging circuit the first leading-out terminal (101), the first leading-out terminal (3) as the second combined loop (22), second leading-out terminal (102) of described the second combined loop charging circuit is connected with one end of electric capacity (17), the other end of the second combined loop inductance (14) is as the second leading-out terminal of the second combined loop (22), the other end of the second combined loop electric capacity (17) is as the direct ground connection of three terminal (7) or the connection neutral line of the second combined loop (22), the second leading-out terminal of initial current path (23) is connected with second leading-out terminal (2) of the first combined loop (21), and the second leading-out terminal of initial current path (23) is connected with first leading-out terminal (3) of the second combined loop (22).
4. according to DC circuit breaker claimed in claim 3, it is characterized in that: when DC power transmission line fault-free, the mechanical switch module (12) of described initial current path and electric power electronic module (13) are all in closure state, when the electric current flowing through on the second combined loop inductance (14) or the first combined loop inductance (11) being detected surpasses limit value, electric power electronic module (13) first disconnects, and then mechanical switch module (12) disconnects rapidly; Make afterwards built-in switch (61) and built-in switch (49) cutoff circuit in the time of the current zero-crossing point of the first combined loop and the second combined loop respectively, thereby realize the disjunction to whole faulty line.
5. according to DC circuit breaker claimed in claim 3, it is characterized in that: when DC power transmission line fault-free, the mechanical switch module (12) of described initial current path and electric power electronic module (13) are all in closure state, when the electric current flowing through on the second combined loop inductance (14) or the first combined loop inductance (11) being detected surpasses limit value, mechanical switch module (12) first starts to disconnect, and then electric power electronic module (13) disconnects; Make afterwards built-in switch (61) and built-in switch (49) cutoff circuit in the time of the current zero-crossing point of the first combined loop and the second combined loop respectively, thereby realize the disjunction to whole faulty line.
6. according to DC circuit breaker claimed in claim 3, it is characterized in that: at initial current path (23) two ends shunt capacitances (53).
7. according to DC circuit breaker claimed in claim 3, it is characterized in that: between first leading-out terminal (3) of the second combined loop and one end (32) of the second combined loop electric capacity, be connected in series electric capacity pre-charge circuit; Or be connected in series electric capacity pre-charge circuit between first leading-out terminal (2) of the first combined loop and one end (33) of the first combined loop electric capacity.
8. according to DC circuit breaker claimed in claim 3, it is characterized in that: at the first combined loop electric capacity two ends and the second combined loop electric capacity two ends voltage limiter in parallel; Or at the voltage limiter in parallel at the two ends of initial current path (23).
9. according to DC circuit breaker claimed in claim 3, it is characterized in that: the first described combined loop only comprises an electric capacity (16) and built-in mechanical switch (61), by DC transmission line, replace the first combined loop inductance (11).
10. according to DC circuit breaker claimed in claim 1, it is characterized in that: described initial current path only comprises mechanical switch module (12), with power transmission line, replace initial current path electric power electronic module (13).
11. according to DC circuit breaker claimed in claim 3, it is characterized in that: the first described combined loop only comprises a built-in mechanical switch (61), by DC transmission line, replaces the first combined loop inductance (11).
12. according to DC circuit breaker claimed in claim 1, it is characterized in that: described initial current path only comprises electric power electronic module (12), with power transmission line, replaces initial current path mechanical switch module (13).
13. according to DC circuit breaker claimed in claim 1, it is characterized in that: in bipolarity transmission line, described DC circuit breaker be take the neutral line or earth point, and to be that reference point is symmetrical install.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310646936.7A CN103632895B (en) | 2013-12-04 | 2013-12-04 | A kind of DC circuit breaker |
| PCT/CN2014/070205 WO2015081615A1 (en) | 2013-12-04 | 2014-01-07 | Direct-current circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310646936.7A CN103632895B (en) | 2013-12-04 | 2013-12-04 | A kind of DC circuit breaker |
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| Publication Number | Publication Date |
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| CN103632895A true CN103632895A (en) | 2014-03-12 |
| CN103632895B CN103632895B (en) | 2016-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310646936.7A Active CN103632895B (en) | 2013-12-04 | 2013-12-04 | A kind of DC circuit breaker |
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| WO (1) | WO2015081615A1 (en) |
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| CN110994419A (en) * | 2019-11-08 | 2020-04-10 | 广东电网有限责任公司 | Uninterrupted maintenance system and method for multi-port direct-current circuit breaker |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2015081615A1 (en) | 2015-06-11 |
| CN103632895B (en) | 2016-01-20 |
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