CN103632895B - A kind of DC circuit breaker - Google Patents

A kind of DC circuit breaker Download PDF

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Publication number
CN103632895B
CN103632895B CN201310646936.7A CN201310646936A CN103632895B CN 103632895 B CN103632895 B CN 103632895B CN 201310646936 A CN201310646936 A CN 201310646936A CN 103632895 B CN103632895 B CN 103632895B
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China
Prior art keywords
combined loop
terminal
leading
current path
initial current
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CN201310646936.7A
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CN103632895A (en
Inventor
肖立业
韦统振
朱晋
王珏
邱清泉
张志丰
林良真
齐智平
李耀华
严萍
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Institute of Electrical Engineering of CAS
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Institute of Electrical Engineering of CAS
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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/548Electromechanical and static switch connected in series
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02Details
    • H01H33/59Circuit 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
    • H01H33/596Circuit 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02Details
    • H02H3/025Disconnection after limiting, e.g. when limiting is not sufficient or for facilitating disconnection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08Emergency 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
    • H02H3/087Emergency 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
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02Details
    • H01H33/04Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/16Impedances connected with contacts

Abstract

A kind of DC circuit breaker, by initial current path (23), the first combined loop (21) and the second combined loop (22) composition; 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); 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.When HVDC (High Voltage Direct Current) transmission line breaks down, cut-offfing of faulty transmission line can be realized fast.

Description

A kind of DC circuit breaker
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 ensureing direct current transmission and distribution system and direct current network system stability safe and reliable operation.Be that the electric current of direct current system does not exist natural zero-crossing point with AC system difference, the natural zero-crossing point of electric current therefore cannot be utilized in direct current system as AC system to turn off, therefore the problem of cut-offfing of direct current is a problem being worth research always.
Current breaking direct current has two kinds of modes usually, and the first is pure power electronics circuit breaker, as the patent CN102870181A of ABB application, utilizes and high-powerly turns off power electronic device, direct disjunction direct current.Utilize the solid circuit breaker that this principle manufactures, although can meet the requirement of multiterminal flexible direct current system in time, the loss when normally is excessive, and economy is poor.
The second is mixing Circuit breaker technology, namely on the basis of traditional interchange mechanical chopper, by increasing auxiliary Power Electronic Circuit, dropping into current-limiting resistance to reduce short circuit current or superimposed oscillation electric current on the direct current cut-offfing arc gap, utilizing during current over-zero and cut-off circuit.Utilize the hybrid circuit breaker that this principle manufactures, it has particular/special requirement to mechanical switch, the more difficult requirement meeting 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 a steady operation, loss is little, without arc cutting when there is short trouble, responds the features such as rapid.
Direct-current breaker topology structure of the present invention comprises: initial current path, the first combined loop and the second combined loop.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.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, such as mechanical switch module and electronic power switch block coupled in series, mechanical switch block coupled in series, electronic power switch block coupled in series etc.
After line short fault being detected, start immediately to cut off initial current path; Before disconnecting initial current path completely, 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 and provide freewheeling path, so that initial current path disconnects; After initial current path disconnects completely, fault current 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 machines switch, the second described combined loop comprises an inductance, an 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 made up of mechanical switch module, also can be made up of electronic power switch module.Mechanical switch module in described initial current path comprises at least one mechanical switch series component, and the power electronics that the electric power electronic module in described initial current path comprises at least one controls devices in series assembly 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 three terminal directly ground connection or connect the 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, 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 the second combined loop charging circuit first leading-out terminal, second leading-out terminal of described 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 three terminal directly ground connection or connect the neutral line of the second combined loop; 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, mechanical switch module and the electric power electronic module of described initial current path are all in closure state, when detecting that the electric current that the second combined loop inductance or the first combined loop inductance flow through exceedes limit value, first electric power electronic module disconnects, then mechanical switch module disconnects rapidly, disconnect built-in switch afterwards, to cut-off the first combined loop and the second combined loop respectively when current zero-crossing point, thus realize cut-offfing faulty line; The another kind of mode of mechanical switch module and electric power electronic module disconnection order is: when detecting that the electric current that the second combined loop inductance or the first combined loop inductance flow through exceedes limit value, first mechanical switch module disconnects, then electric power electronic module disconnects rapidly, disconnect built-in switch afterwards, to cut-off the first combined loop and the second combined loop respectively when current zero-crossing point, thus realize cut-offfing faulty line.
The present invention can optionally increase electric capacity pre-charge circuit at the second leading-out terminal of one end of the first combined loop inductance and the first combined loop, or optionally increases the pre-charge circuit of electric capacity between first leading-out terminal and one end of the second combined loop electric capacity of the second combined loop.
The present invention also can optionally shunt capacitance at initial current path two ends.
The present invention can 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 avoids capacitor to damage because of overvoltage; Also can at the two ends of initial current path parallel connection voltage limiter, thus initial current path be avoided to damage because of overvoltage.Or between the first combined loop and the second combined loop, be connected in series voltage limiter.
The another kind of implementation of the first described combined loop, for only to comprise an electric capacity and built-in machines switch, replaces inductance by DC transmission line.
The another kind of frame mode of the first described combined loop is for only to comprise a built-in machines switch, and electric capacity can remove, and replaces inductance by DC transmission line.
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 with many groups full control switch module composition, also can entirely control switch module with one group and organize half control switch module more and form, also can be made up of half-bridge or full-bridge subelement module-cascade structure.
The version that the topological structure of DC circuit breaker of the present invention is installed for reference point symmetry with the neutral line or earth point is applicable to bipolarity transmission line.
Inductance in the present invention 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, namely be not limited in and only comprise an inductance and an electric capacity, can be made up of multiple inductance and electric capacity or resistance and replace electric capacity in the first combined loop and the second combined loop herein and inductance together with multistage similar anatomical connectivity.
The another kind of implementation of described initial current path is: be made up of initial current path first switch element and the cascade of one or more capacitance switch combinational circuit.Described capacitance switch combinational circuit is by capacitor cell, and switch element, 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 as capacitance switch combinational circuit one end leading-out terminal with switch element, 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 run, 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 first switch element cut-off in turn or cut-off simultaneously; Final formation first combined loop and the second combined loop two current circuits, turn off process is thereafter identical with DC circuit breaker turn off process when not adding capacitance switch combinational circuit.
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 the transient process of zero, can extrapolate short-circuit impedance now, can be used for the position of extrapolating short dot, carry out fault location.
Advantage of the present invention:
A. this direct-current breaker topology is cut-off more rapid, 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. short circuit current can control in lower level by this DC circuit breaker, thus protection system fail safe;
D. this direct-current breaker topology can reduce the impact of short circuit current on current conversion station;
E. be more easily combined with flexible direct current power transmission system, be suitable for integrated design;
F. the loss compared with pure electronic power switch formula DC circuit breaker during system worked well is less;
G. this circuit breaker can also be used for maintaining Enhancement of Transient Voltage Stability when normal state is run.
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, first combined loop 21 and the second combined loop 22.First leading-out terminal of initial current path 23 is connected with the second leading-out terminal of the first combined loop 21, second leading-out terminal of initial current path 23 is connected with the first leading-out terminal of the second combined loop, 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.
Embodiment 1
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, first combined loop 21, 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 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 machines switch 61, the second described combined loop comprises an inductance 14, electric capacity 17 and a charging circuit thereof, and described charging circuit is made up 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 power electronics that the electric power electronic module 13 in described initial current path comprises at least one controls devices in series assembly 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, and the second leading-out terminal 2 as the first combined loop 21 is 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 three terminal 8 direct ground connection of the first combined loop or the connection neutral line; Second described combined loop charging circuit built-in switch 49 one end is connected the first leading-out terminal 101 as the second combined loop charging circuit with second combined loop charging circuit resistance 50 one end, described second combined loop charging circuit built-in switch 49 other end and second combined loop charging circuit resistance 50 other end are as the second leading-out terminal 102 of the second combined loop charging circuit; One end of second combined loop inductance 14 is connected the first leading-out terminal 3 as the second combined loop 22 with the second combined loop charging circuit first leading-out terminal 101, second leading-out terminal 102 of described 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 the three terminal 7 direct ground connection of the second combined loop 22 or the connection neutral line; 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, mechanical switch module 12 and the electric power electronic module 13 of described initial current path are all in closure state, when detecting that the electric current that short circuit state concussion current path inductance 14 flows through exceedes limit value, first electric power electronic module 13 disconnects, then mechanical switch module 12 disconnects rapidly, when voltage between second leading-out terminal 2 and the first leading-out terminal 3 of the second combined loop of the first combined loop exceedes the operation voltage of voltage limiter 15, voltage limiter 15 action, consume the excess energy that upper first combined loop inductance stores.
Embodiment 2
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.
Embodiment 3
Figure 4 shows that embodiments of the invention 3, electric capacity pre-charge circuit 41 is added between the first combined loop second leading-out terminal 2 and one end 33 of the first combined loop electric capacity, 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 closes, and precharge by-pass switch 46 disconnects, and carry out precharge to short circuit state concussion current path electric capacity and the first combined loop electric capacity, after charging complete, precharge switch 45 disconnects, and precharge by-pass switch 46 closes.
Electric capacity pre-charge circuit 52 is added between the second combined loop first leading-out terminal 3 and one end 32 of the second combined loop electric capacity, 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 closes, and precharge by-pass switch 49 disconnects, and carries out precharge to the second combined loop electric capacity, and after charging complete, precharge switch 51 disconnects, and precharge by-pass switch 49 closes.
Embodiment 4
Fig. 5 is embodiments of the invention 4, the voltage limiter 47 in parallel at the two ends of the first combined loop electric capacity, the voltage limiter 48 in parallel at the two ends of the second combined loop electric capacity.When the first combined loop electric capacity both end voltage exceedes 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 exceedes 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 circuit itself has inductive effect, can replace inductance 11 in embodiment 1 and inductance 14 with current conversion station, therefore the inductance DC transmission line 55 of the first combined loop replaces, and namely the first combined loop only comprises an electric capacity;
Embodiment 6
Fig. 7 is the embodiment of further application of the invention and two-way open circuit operating mode, adopts special machine circuit breaker, can replace the electric power electronic module 13 in embodiment 1, mechanical chopper bi-directional failure electric current capable of blocking by DC transmission line 57;
Embodiment 7
Fig. 8 is as embodiment when further application of the invention and bipolarity flexible DC power transmission, first leading-out terminal 61 of the first circuit breaker 60 is connected with the positive pole on bipolar transmission line road, 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 and the 4th leading-out terminal 67 are connected to ground.First leading-out terminal 63 of the second circuit breaker 65 is connected with the negative pole on bipolar transmission line road, 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 and the 4th leading-out terminal 69 are connected to ground.
Embodiment 8
Fig. 9 is as the embodiment of further application of the invention and two-way open circuit operating mode, electric power electronic module 70 in initial current path 73 is by adopting the first mutually reverse power electronics entirely to control devices in series structure 71 and the second power electronics controls devices in series structure 72 entirely, can the electric current of conducting both direction, and the fault current of both direction capable of blocking; Realize bidirectional protective function.
Embodiment 9
Figure 10 is as embodiments of the invention 9, and initial current path is only made up of electric power electronic module 223, and electric power electronic module is composed in series by multiple wholly-controled device, possesses turn-off speed faster.
Embodiment 10
Figure 11 is as embodiments of the invention 10, initial current path is only made up of electric power electronic module 223, electric power electronic module is made up of wholly-controled device serial module structure 214 and half control type devices in series module 215, wholly-controled device serial module structure and half control type devices in series module two ends are all in parallel voltage limiting device; Described wholly-controled device serial module structure 214 is composed in series, as IGBT, IGCT etc. by the wholly-controled device of at least one; Half control type devices in series module 215 is made up of, as thyristor etc. the half control type devices in series of at least one.When there is short trouble in system, half control type devices in series module 215 and wholly-controled device serial module structure 215 receive cut-off signals simultaneously, wholly-controled device serial module structure 215 directly turns off, the electric current flowed through on initial current path is blocked instantaneously, and half control type devices in series module 215 current over-zero turns off naturally.
Embodiment 11
Figure 12 is as embodiments of the invention 11, initial current path is only made up of electric power electronic module 223, electric power electronic module is made up of wholly-controled device differential concatenation module 216 and half control type device inverse parallel module 216, and half control type device inverse parallel module 216 is composed in series by the anti-parallel thyristor of at least one.Described DC circuit breaker possesses bi-directional failure current blocking ability.
Embodiment 12
Figure 13 is as embodiments of the invention 12, and initial current path 23 is by the first switch element 323, and initial current path first capacitance switch combinational circuit 133, initial current path second capacitance switch combinational circuit 233 forms.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 to 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 module 123 is connected with the first leading-out terminal of the second capacitance switch combinational circuit 233.
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 with one end of switch module 223 as the second capacitance switch combinational circuit 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 to 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 second capacitance switch combinational circuit 233 switch module 223 is connected with the first leading-out terminal of the second combinational circuit.
When DC transmission system is normally run, initial current path first switch element 323, first capacitance switch combinational circuit switch element 123, 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 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 flows 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 zero gradually.Current in the short flows through the second combined loop electric capacity, and the second combined loop inductance, transmission line, short dot 25 form loop, 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; 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); 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, 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, and described initial current path 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 machines switch (61), the second described combined loop comprises an inductance (14), an electric capacity (17) and charging circuit thereof, and described charging circuit is made up of built-in switch (49) and resistance (50); The built-in switch (49) of the second described combined loop charging circuit is made up of mechanical switch module or electronic power switch module.
2. according to DC circuit breaker according to claim 1, it is characterized in that: after line short fault being detected, start immediately to cut off initial current path (23); Disconnected initial current path (23) completely in the past, first combined loop (21) and the second combined loop (22) make initial current path (23) two ends potential difference brought can in tolerance range at the electric power electronic module (13) of initial current path, and the first combined loop (21) and the second combined loop (22) are respectively fault current provides freewheeling path, so that initial current path (23) disconnects; After initial current path (23) disconnects completely, fault current respectively by the first combined loop (21) and the second combined loop (22) afterflow, and gradually decay or oscillatory extinction to zero or by the built-in machines switch of the first combined loop (21) and the built-in switch of the second combined loop (22) in current zero-crossing point disjunction respectively.
3. according to DC circuit breaker according to claim 1, it is characterized in that: the mechanical switch module (12) in described initial current path comprises at least one mechanical switch series component, the electric power electronic module (13) in described initial current path comprises at least one power electronics and entirely controls devices in series assembly, one end of mechanical switch module (12) in initial current path is connected with one end of electric power electronic module (13), and the other end of the mechanical switch module (12) in initial current path is as the first leading-out terminal of initial current path, the other end of electric power electronic module is connected with the first leading-out terminal of the second combined loop (22) as the second leading-out terminal of initial current path, the one end of inductance (11) in the first described combined loop is connected with DC transmission line as first leading-out terminal (1) of the first combined loop, the other end of the inductance (11) in the first described combined loop is connected with one end of the first combined loop built-in machines switch (61), the other end of built-in machines switch (61) is connected with one end of the electric capacity (16) in the first combined loop, and the second leading-out terminal (2) as the first combined loop (21) is connected with the first leading-out terminal of initial current path (23), the other end of the electric capacity (16) in the first combined loop is as three terminal (8) the directly ground connection or connect the 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 resistance (50) of the second combined loop charging circuit, the other end of the other end of the built-in switch (49) of the second combined loop charging circuit and the resistance (50) of the second combined loop charging circuit is as second leading-out terminal (102) of the second combined loop charging circuit, one end of inductance (14) in second combined loop is connected with the second combined loop charging circuit first leading-out terminal (101), as first leading-out terminal (3) of the second combined loop (22), second leading-out terminal (102) of described second combined loop charging circuit is connected with one end of the electric capacity (17) in the second combined loop, the other end of the inductance (14) in the second combined loop is as the second leading-out terminal of the second combined loop (22), the other end of the electric capacity (17) in the second combined loop is as three terminal (7) the directly ground connection or connect the neutral line of the second combined loop (22).
4. according to DC circuit breaker according to claim 3, it is characterized in that: when DC power transmission line fault-free, mechanical switch module (12) and the electric power electronic module (13) of described initial current path are all in closure state, when detecting that the electric current that the inductance (11) in the inductance in the second combined loop (14) or the first combined loop flows through exceedes limit value, first the electric power electronic module (13) of initial current path disconnects, and then the mechanical switch module (12) of initial current path disconnects rapidly; The built-in switch (49) making the built-in machines switch (61) of the first combined loop and the second combined loop is afterwards the cutoff circuit when the current zero-crossing point of the first combined loop and the second combined loop respectively, thus realizes the disjunction to whole faulty line.
5. according to DC circuit breaker according to claim 3, it is characterized in that: when DC power transmission line fault-free, mechanical switch module (12) and the electric power electronic module (13) of described initial current path are all in closure state, when detecting that the electric current that the inductance (11) in the inductance in the second combined loop (14) or the first combined loop flows through exceedes limit value, the mechanical switch module (12) of initial current path first starts to disconnect, and then the electric power electronic module (13) of initial current path disconnects; The built-in switch (49) making the built-in machines switch (61) of the first combined loop and the second combined loop is afterwards the cutoff circuit when the current zero-crossing point of the first combined loop and the second combined loop respectively, thus realizes the disjunction to whole faulty line.
6. according to DC circuit breaker according to claim 3, it is characterized in that: at initial current path (23) two ends shunt capacitance (53).
7. according to DC circuit breaker according to claim 3, it is characterized in that: serial capacitance pre-charge circuit between one end (32) of the electric capacity in first leading-out terminal (3) and the second combined loop of the second combined loop; Or serial capacitance pre-charge circuit between one end (33) of electric capacity in first leading-out terminal (2) and the first combined loop of the first combined loop.
8. according to DC circuit breaker according to claim 3, it is characterized in that: the electric capacity two ends in the first combined loop and the electric capacity two ends in the second combined loop voltage limiter in parallel; Or at the two ends of initial current path (23) difference voltage limiter in parallel.
9. according to DC circuit breaker according to claim 3, it is characterized in that: the first described combined loop only comprises an electric capacity (16) and built-in machines switch (61), replace the inductance (11) in the first combined loop by DC transmission line.
10. according to DC circuit breaker according to claim 3, it is characterized in that: described initial current path only comprises mechanical switch module (12), replace the electric power electronic module (13) in initial current path with power transmission line.
11., according to DC circuit breaker according to claim 3, is characterized in that: the first described combined loop only comprises a built-in machines switch (61), replace the inductance (11) in the first combined loop by DC transmission line.
12., according to DC circuit breaker according to claim 3, is characterized in that: described initial current path only comprises electric power electronic module (13), replace the mechanical switch module (12) in initial current path with power transmission line.
13., according to DC circuit breaker according to claim 1, is characterized in that: in bipolarity transmission line, and described DC circuit breaker is installed for reference point is symmetrical with the neutral line or earth point.
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