CN105281289A - Bidirectional combined type direct current breaker and control method thereof - Google Patents
Bidirectional combined type direct current breaker and control method thereof Download PDFInfo
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- CN105281289A CN105281289A CN201510819311.5A CN201510819311A CN105281289A CN 105281289 A CN105281289 A CN 105281289A CN 201510819311 A CN201510819311 A CN 201510819311A CN 105281289 A CN105281289 A CN 105281289A
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Abstract
The present invention discloses a bidirectional combined type direct current breaker and a control method thereof. The bidirectional combined type direct current breaker comprises a principal current circuit, a no-voltage circuit, a null-current circuit and an energy absorption circuit, wherein the principal current circuit, the no-voltage circuit, the null-current circuit and the energy absorption circuit are in parallel. The principal current circuit employs a mechanical switch; the no-voltage circuit employs a bi-directional semiconductor switch formed through anti-parallel thyristors; the null-current circuit is a bi-directional pulse current circuit formed by a precharge capacitor, an inductor and a thyristor bridge; and the energy absorption circuit employs a metal-oxide varistor. The present invention further discloses a control method of the bidirectional combined type direct current breaker. According to the invention, the no-voltage circuit employs thyristors so that the on-state voltage drop is small and the current commutation speed is fast, and a mechanical switch has sufficient dielectric recovery time and post arc dielectric recovery is reliable; a null-current circuit is adopted to realize quick shutdown of the thyristors, and the breaking capacity of a breaker is great; and two working modes are convenient to be realized, and the working capability of the breaker is easy to be improved. The bidirectional combined type direct current breaker and the control method thereof are applicable to the fault protection of a bi-directional direct current power system, with small loss of long-term flow passage, rapid breaking motion, high work reliability and the like.
Description
Technical field
The invention belongs to electric power system fault resist technology field, be specifically related to a kind of two-way hybrid DC circuit breaker, and its control method.
Background technology
Direct current power system is because of its significant advantage, more and more extensive in the application of boats and ships, mine, track traffic and field of new energy generation in recent years.Along with the development of direct current power system and the quality of power supply requirement of user's increasingly stringent; traditional mechanical chopper is difficult to the specific demand of satisfied modern high-capacity direct current electric network protection, in the urgent need to can the novel protected equipment of fast and reliable disjunction DC circuit.
Adopt the DC solid circuit breaker that pure semiconductor switch realizes, as shown in Figure 1, utilize full-control type semiconductor device to realize system through-flow and fault current disjunction for a long time, there is the advantage without the quick disjunction direct current of arc, but its breaking capacity is lower, and system long-time running loss is excessive.
Hybrid circuit breaker comprises mechanical switch and semiconductor switch simultaneously, has both the good static properties of mechanical switch and the excellent dynamic characteristic of semiconductor switch.
The Zero Current Switch be made up of Fast mechanical switch and LC forced commutation circuit, as shown in Figure 2, after system is short-circuited fault, is transferred to LC converter circuit by recharged capacitance electric discharge by fault current, realizes the disjunction of mechanical switch current over-zero.Because the di/dt in big current breaking course during mechanical switch current over-zero is very high, after causing arc, medium is difficult to fast quick-recovery, and therefore Zero Current Switch big current reliable breaking is lower.
The zero voltage switch be made up of Fast mechanical switch and Turn-off semiconductor device (IGBT etc.), as shown in Figure 3, utilizes the electric arc produced during mechanical switch disjunction, forces electric current to shift in semiconductor device, realizes the disjunction of mechanical switch current over-zero.Because arc voltage is lower, Turn-off semiconductor device on-state voltage drop is comparatively large, usually require that between commutating circuit, close-coupled, to reduce stray inductance, realizes the fast transfer of fault current.When making current transfer overlong time because circuit design is unreasonable, the short circuit current be finally transferred in semiconductor device is very large, may exceed the turn-off capacity of semiconductor device, causes circuit breaker disjunction failure.
Summary of the invention
In order to overcome the shortcoming and defect of prior art, an object of the present invention is to provide a kind of in conjunction with Fast mechanical switch and thyristor, the two-way hybrid DC circuit breaker comprising no-voltage and zero current hybrid disjunction thought simultaneously.
The technical solution adopted for the present invention to solve the technical problems is: a kind of two-way hybrid DC circuit breaker, comprise main current circuit, no-voltage circuit, null-current circuit, energy absorption circuit, system wiring end J1 and J2, described main current circuit, no-voltage circuit, null-current circuit and energy absorption circuit are in parallel, first connecting end of parallel circuits is connected with described system wiring end J1, and the second connecting end of parallel circuits is connected with described system wiring end J2; Described main current circuit comprises mechanical switch S, and described mechanical switch S is the Fast mechanical switch realized based on electromagnetic repulsion force principle; Described no-voltage circuit comprises reverse parallel connection to realize thyristor T1 and T2 of two-way through-flow function; Described null-current circuit comprises the two--way pulse current circuit be made up of recharged capacitance C, inductance L and thyristor bridge; Described thyristor bridge is the bridge circuit be made up of thyristor T3, T4, T5 and T6, the connecting end of described thyristor T5 and T6 is as the DC side positive pole of bridge circuit, the connecting end of described thyristor T3 and T4 is as the DC side negative pole of bridge circuit, the connecting end of described thyristor T3 with T5 exchanges end as first of bridge circuit, and the connecting end of described thyristor T4 with T6 exchanges end as second of bridge circuit; The series circuit that described electric capacity C and inductance L series connection are formed is connected across the DC side of thyristor bridge, one end of described electric capacity C is connected with the DC side negative pole of described bridge circuit, as the positive pole of pre-charge voltage, one end of described inductance L is connected with the DC side positive pole of described bridge circuit; First of described bridge circuit exchanges end and is connected with the first connecting end of described parallel circuits, and second of described bridge circuit exchanges end and is connected with the second connecting end of described parallel circuits; Described energy absorption circuit comprises metal oxide piezo-resistance MOV.
Two of object of the present invention is to provide a kind of control method of two-way hybrid DC circuit breaker.
The technical solution adopted for the present invention to solve the technical problems is:
A control method for two-way hybrid DC circuit breaker, step is as follows:
A), system is when normally running, and direct current is born by mechanical switch S completely, and thyristor T1 or T2 turns off;
B), after system is short-circuited fault, mechanical switch S disjunction, flow to according to short circuit current, thyristor T1 or T2 conducting, under the effect of mechanical switch S breaking arc, short circuit current is forced to shift rapidly to thyristor T1 or T2 from mechanical switch S;
C), after short circuit current is transferred to thyristor T1 or T2 completely, when time delay to the contact of mechanical switch S is separated into and enough opens distance, according to current direction, T4-T5 or the conducting of T3-T6 brachium pontis in thyristor bridge, electric capacity C produces pulse current by inductance L electric discharge, forces the electric current in T1 or T2 to be reduced to zero;
D), when thyristor T1 or T2 current over-zero close have no progeny, system busbar is to electric capacity C reverse charging, and cause circuit breaker both end voltage constantly to increase from back-pressure to malleation, short circuit current equals capacitance charging current;
E), when circuit breaker both end voltage be increased to piezo-resistance MOV open value after, piezo-resistance MOV conducting absorption system energy over-voltage, realize the restriction of fault current and finally make it be reduced to zero.
The control method of described a kind of two-way hybrid DC circuit breaker, further comprising the steps of: when system power flows to system wiring end J2 from system wiring end J1, in breaking course, thyristor T1 conducting, causes T4-T5 brachium pontis conducting in thyristor bridge; When system power flows to system wiring end J1 from system wiring end J2, in breaking course, thyristor T2 conducting, causes T3-T6 brachium pontis conducting in thyristor bridge.
The control method of described a kind of two-way hybrid DC circuit breaker, further comprising the steps of: to be transferred to thyristor T1 or T2 completely from short circuit current, to thyristor T1 or before the T2 current over-zero moment, mechanical switch S both end voltage is the minimum on-state voltage drop of thyristor, has the sufficient medium recovery time after mechanical switch S arc.
The control method of described a kind of two-way hybrid DC circuit breaker, further comprising the steps of: first to bear larger reverse voltage after thyristor T1 or T2 current over-zero, then gradually become forward voltage.
A control method for two-way hybrid DC circuit breaker, step is as follows:
A), in thyristor bridge when T4-T5 or the conducting of T3-T6 brachium pontis, thyristor T2 or T1 conducting also continue for some time, when after thyristor T1 or T2 current over-zero, and impulse discharge current afterflow from T2 or T1 of electric capacity C;
B), after thyristor T2 or T1 afterflow terminate, system busbar is to electric capacity C reverse charging, and cause circuit breaker both end voltage constantly to increase, short circuit current equals capacitance charging current;
C), when circuit breaker both end voltage be increased to piezo-resistance MOV open value after, piezo-resistance MOV conducting absorption system energy over-voltage, realize the restriction of fault current and finally make it be reduced to zero.
The control method of described a kind of two-way hybrid DC circuit breaker, further comprising the steps of: in breaking course, when in thyristor bridge during the conducting of T4-T5 brachium pontis, thyristor T2 conducting afterflow; When in thyristor bridge during the conducting of T3-T6 brachium pontis, thyristor T1 conducting afterflow.
The control method of described a kind of two-way hybrid DC circuit breaker, further comprising the steps of: to be transferred to thyristor T1 or T2 completely from short circuit current, to thyristor T2 or before T1 afterflow finish time, mechanical switch S both end voltage is the minimum on-state voltage drop of thyristor, has the medium recovery time more fully after mechanical switch S arc.
The control method of described a kind of two-way hybrid DC circuit breaker, further comprising the steps of: after described thyristor T1 or T2 current over-zero, first to bear the reverse voltage that voltage equals the described minimum on-state voltage drop of thyristor T2 or T1, after described thyristor T2 or T1 afterflow terminate, described mechanical switch S both end voltage becomes forward, avoids larger reverse voltage to have a negative impact to system.
The invention has the beneficial effects as follows:
1, no-voltage circuit adopts thyristor, and on-state voltage drop is little, and current transfer speed is fast;
2, mechanical switch has the sufficient medium recovery time, and after arc, medium recovery is reliable;
3, adopt null-current circuit to realize the quick shutoff of thyristor, circuit breaker breaking capacity is strong;
4, conveniently realize two kinds of mode of operations, the service behaviour of circuit breaker is easy to improve.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of existing solid circuit breaker scheme;
Fig. 2 is the schematic diagram of existing Zero Current Switch scheme;
Fig. 3 is the schematic diagram of existing zero voltage switch scheme;
Fig. 4 is the schematic diagram of two-way hybrid DC circuit breaker scheme of the present invention;
Fig. 5 is the schematic diagram of scheme in the specific embodiment of the invention 1;
Fig. 6 is the expection disjunction waveform in the specific embodiment of the invention 1;
Fig. 7 is the schematic diagram of scheme in the specific embodiment of the invention 2;
Fig. 8 is the expection disjunction waveform in the specific embodiment of the invention 2.
Each Reference numeral is: 1-main current circuit, 2-no-voltage circuit, 3-null-current circuit, 4-energy absorption circuit, J1-system wiring end, J2-system wiring end, S-control switch.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
With reference to shown in Fig. 4, the invention discloses a kind of two-way hybrid DC circuit breaker, comprise main current circuit 1, no-voltage circuit 2, null-current circuit 3, energy absorption circuit 4, system wiring end J1 and system wiring end J2, wherein:
Described main current circuit 1, no-voltage circuit 2, null-current circuit 3 and energy absorption circuit 4 are in parallel, and the first connecting end of parallel circuits is connected with described system wiring end J1, and the second connecting end of parallel circuits is connected with described system wiring end J2;
Described main current circuit 1 comprises mechanical switch S, and described mechanical switch S is the Fast mechanical switch realized based on electromagnetic repulsion force principle;
Described no-voltage circuit 2 comprises reverse parallel connection to realize thyristor T1 and T2 of two-way through-flow function;
Described null-current circuit 3 comprises the two--way pulse current circuit be made up of recharged capacitance C, inductance L and thyristor bridge; Described thyristor bridge is the bridge circuit be made up of thyristor T3, T4, T5 and T6, the connecting end of described thyristor T5 and T6 is as the DC side positive pole of bridge circuit, the connecting end of described thyristor T3 and T4 is as the DC side negative pole of bridge circuit, the connecting end of described thyristor T3 with T5 exchanges end as first of bridge circuit, and the connecting end of described thyristor T4 with T6 exchanges end as second of bridge circuit; The series circuit that described electric capacity C and inductance L series connection are formed is connected across the DC side of thyristor bridge, one end of described electric capacity C is connected with the DC side negative pole of described bridge circuit, as the positive pole of pre-charge voltage, one end of described inductance L is connected with the DC side positive pole of described bridge circuit; First of described bridge circuit exchanges end and is connected with the first connecting end of described parallel circuits, and second of described bridge circuit exchanges end and is connected with the second connecting end of described parallel circuits; Described energy absorption circuit 4 comprises metal oxide piezo-resistance MOV.
A control method for two-way hybrid DC circuit breaker, step is as follows: a), system is when normally running, and direct current is born by mechanical switch S completely, thyristor T1(or T2) turn off; B), after system is short-circuited fault, mechanical switch S disjunction, flows to according to short circuit current, thyristor T1(or T2) conducting, under the effect of mechanical switch S breaking arc, short circuit current is forced to from mechanical switch S to thyristor T1(or T2) shift rapidly; C), when short circuit current is transferred to thyristor T1(or T2 completely) after, when time delay to the contact of mechanical switch S is separated into and enough opens distance, according to current direction, T4-T5(or T3-T6 in thyristor bridge) brachium pontis conducting, electric capacity C by inductance L electric discharge produce pulse current, force T1(or T2) in electric current be reduced to zero; D), as thyristor T1(or T2) current over-zero close have no progeny, system busbar is to electric capacity C reverse charging, and cause circuit breaker both end voltage constantly to increase from back-pressure to malleation, short circuit current equals capacitance charging current; E), when circuit breaker both end voltage be increased to piezo-resistance MOV open value after, piezo-resistance MOV conducting absorption system energy over-voltage, realize the restriction of fault current and finally make it be reduced to zero.
When system power flows to system wiring end J2 from system wiring end J1, in breaking course, thyristor T1 conducting, causes T4-T5 brachium pontis conducting in thyristor bridge; When system power flows to system wiring end J1 from system wiring end J2, in breaking course, thyristor T2 conducting, causes T3-T6 brachium pontis conducting in thyristor bridge.
Thyristor T1(or T2 is transferred to completely from short circuit current), to thyristor T1(or T2) before the current over-zero moment, mechanical switch S both end voltage is the minimum on-state voltage drop of thyristor, has the sufficient medium recovery time after mechanical switch S arc.
Thyristor T1(or T2) first bear larger reverse voltage after current over-zero, then gradually become forward voltage, larger reverse voltage contributes to the turn-off time reducing thyristor T1 (or T2).
Embodiment 1
Shown in Figure 5, for two-way hybrid DC circuit breaker disclosed by the invention work in the first mode of operation, system power flows to system wiring end J2 from system wiring end J1 time equivalent electric circuit.Breaking course is as follows:
With reference to shown in Fig. 6,
t<
t 0in the stage, mechanical switch S is in closure state, and load current flows through from mechanical switch S,
t=
t 0in the moment, system is short-circuited fault, mechanical switch S electric current
i salong with short circuit current
i 0increase start rise;
?
t=
t 1in the moment, mechanical switch S disjunction, thyristor T1 conducting simultaneously, under the effect of arc voltage, electric current is forced to shift to thyristor T1 from mechanical switch S, result
i sreduce,
i t1increase;
?
t=
t 2in the moment, electric current is transferred in thyristor T1 completely, and mechanical switch S electric current is zero, and after this short circuit current is born by thyristor T1 completely,
i 0increase gradually;
?
t=
t 3moment, mechanical switch S contact reaches enough and opens distance, T4-T5 brachium pontis conducting in thyristor bridge, and electric capacity C produces pulse high current by inductance L electric discharge, force the electric current in thyristor T1 gradually to the middle transfer of circuit (hereinafter referred to as L-C circuit) that inductance L and electric capacity C are connected, result
i t1reduce,
i cincrease;
?
t=
t 4in the moment, thyristor T1 electric current is reduced to zero, and after this short circuit current is born by L-C circuit completely,
i 0along with the reverse charging electric current of electric capacity C
i cincrease gradually, electric capacity C voltage
u cwith whole circuit breaker voltage
u 0increase to malleation gradually from back-pressure;
?
t=
t 5moment, because the reverse charging process of electric capacity C makes circuit breaker voltage
u 0reach system power source voltage, result short circuit current
i 0reach peak value, after this along with voltage
u 0continuous increase, short circuit current
i 0start to reduce;
?
t=
t 6moment, circuit breaker voltage
u 0what be increased to piezo-resistance MOV opens value, and piezo-resistance MOV opens energy-absorbing and restriction system overvoltage, and electric current shifts to MOV from L-C circuit, result
i mOVincrease,
i creduce;
?
t=
t 7moment, L-C circuital current
i cbe reduced to zero, in thyristor bridge, T4-T5 brachium pontis turns off, piezo-resistance MOV electric current
i mOVreach peak value, corresponding circuit breaker voltage
u 0and capacitance voltage
u cvoltage all reaches maximum;
After this short circuit current is born by piezo-resistance MOV completely, along with direct current system energy is constantly absorbed by piezo-resistance MOV, and short circuit current
i 0along with electric current
i mOVreduce gradually, finally exist
t=
t 8moment energy absorption is complete, and electric current is reduced to zero, and breaking course terminates, circuit breaker voltage
u 0be down to system power source voltage.
In above-mentioned breaking course, in the moment
t 2with
t 4period, mechanical switch S electric current is zero, and voltage is the on-state voltage drop that thyristor T1 is minimum, has the sufficient medium recovery time after mechanical switch S arc;
t 4the reverse voltage that after moment, thyristor T1 two ends are larger contributes to the turn-off time reducing thyristor T1.
When system power flows to system wiring end J1 from system wiring end J2, according to T3-T6 brachium pontis action in mechanical switch S, thyristor T2 and thyristor bridge in above-mentioned steps successively control chart 4.
A kind of control method of two-way hybrid DC circuit breaker, step is as follows: A), in thyristor bridge T4-T5(or T3-T6) brachium pontis conducting time, thyristor T2(or T1) conducting continuing for some time, as thyristor T1(or T2) after current over-zero, the impulse discharge current of electric capacity C is from T2(or T1) afterflow; B), as thyristor T2(or T1) after afterflow terminates, system busbar is to electric capacity C reverse charging, and cause circuit breaker both end voltage constantly to increase, short circuit current equals capacitance charging current; C), when circuit breaker both end voltage be increased to piezo-resistance MOV open value after, piezo-resistance MOV conducting absorption system energy over-voltage, realize the restriction of fault current and finally make it be reduced to zero.
In breaking course, when in thyristor bridge during the conducting of T4-T5 brachium pontis, thyristor T2 conducting afterflow; When in thyristor bridge during the conducting of T3-T6 brachium pontis, thyristor T1 conducting afterflow.
Thyristor T1 to T2(or T2 to T1 is transferred to completely from short circuit current) between afterflow tailend, mechanical switch S both end voltage is the minimum on-state voltage drop of thyristor, has the medium recovery time more fully after mechanical switch S arc.
Thyristor T1(or T2) first bear voltage after current over-zero and equal thyristor T2(or T1) reverse voltage of minimum on-state voltage drop, as thyristor T2(or T1) after afterflow terminates, mechanical switch S both end voltage becomes forward, avoids larger reverse voltage to have a negative impact to system.
Embodiment 2
Shown in Figure 7, for two-way hybrid DC circuit breaker disclosed by the invention work in the second mode of operation, system power flows to system wiring end J2 from system wiring end J1 time equivalent electric circuit.
With reference to shown in Fig. 8, its breaking course exists
t=
t 3identical with the first mode of operation in embodiment 1 before moment;
?
t=t
3in the moment, mechanical switch S contact reaches enough and opens distance, and T4-T5 brachium pontis and thyristor T2 conducting simultaneously in thyristor bridge, electric capacity C produces pulse high current by inductance L electric discharge, forces the electric current in thyristor T1 to shift in L-C circuit gradually, result
i t1reduce,
i cincrease;
Because thyristor T1 is in conducting state always, cause thyristor T2 both end voltage to be reverse voltage, although T2 has Continuity signal, before T1 electric current is reduced to zero, do not have electric current to flow through;
?
t=
t 4in the moment, thyristor T1 current over-zero turns off, and because the Continuity signal of thyristor T2 is continued until that T1 electric current is after zero, therefore exists
t 4after moment, T2 bears forward voltage conducting, impulse discharge current afterflow from T2 of electric capacity C;
In the afterflow process of thyristor T2, electric capacity C voltage
u cincrease to malleation gradually from back-pressure, whole circuit breaker both end voltage
u 0clamped down in extremely low level by the on-state voltage drop of thyristor T2;
?
t=
t 5moment, the impulse discharge current of electric capacity C
i cbe reduced to after peak value and system short-circuit electric current
i 0equal, cause thyristor T2 current over-zero to turn off, afterflow process terminates;
After this short circuit current is born by L-C circuit completely,
i 0along with the reverse charging electric current of electric capacity C
i cincrease gradually, electric capacity C voltage
u cand circuit breaker voltage
u 0increase gradually;
?
t=
t 6moment, because the reverse charging process of electric capacity C makes circuit breaker voltage
u 0reach system power source voltage, result short circuit current
i 0reach peak value, after this along with voltage
u 0continuous increase, short circuit current
i 0start to reduce;
?
t=
t 7moment, circuit breaker voltage
u 0what be increased to piezo-resistance MOV opens value, and piezo-resistance MOV opens energy-absorbing and restriction system overvoltage, and electric current shifts to MOV from L-C circuit, result
i mOVincrease,
i creduce;
?
t=
t 8moment, L-C circuital current
i cbe reduced to zero, in thyristor bridge, T4-T5 brachium pontis turns off, piezo-resistance MOV electric current
i mOVreach peak value, corresponding circuit breaker voltage
u 0and capacitance voltage
u cvoltage all reaches maximum;
After this short circuit current is born by piezo-resistance MOV completely, along with direct current system energy is constantly absorbed by piezo-resistance MOV, and short circuit current
i 0along with electric current
i mOVreduce gradually, finally exist
t=
t 9moment energy absorption is complete, and electric current is reduced to zero, and breaking course terminates, circuit breaker voltage
u 0be down to system power source voltage.
In said process, due to thyristor T2 conducting afterflow, in the moment
t 2with
t 5period, mechanical switch S electric current is zero, and voltage is the on-state voltage drop that thyristor T1 is minimum, has the medium recovery time more fully after mechanical switch S arc; Circuit breaker two ends there will not be larger reverse voltage, avoid to system band adverse effect.
When system power flows to system wiring end J1 from system wiring end J2, according to T3-T6 brachium pontis in mechanical switch S, thyristor T2, thyristor bridge in above-mentioned steps successively control chart 4 and thyristor T1 action.
Therefore the present invention passes through the minimum thyristor of employing on-state voltage drop as no-voltage change of current semiconductor device, can realize the fast transfer of short circuit current; For mechanical switch S provides the medium recovery time after sufficient arc, guarantee medium Trusted recovery; By LC null-current circuit, no-voltage commutated thyristor is turned off fast, improve the breaking capacity of circuit breaker; Two kinds of mode of operations can be realized more easily, improve the service behaviour of circuit breaker.
Above-described embodiment is illustrative principle of the present invention and effect thereof only; and the embodiment that part is used, for the person of ordinary skill of the art, without departing from the concept of the premise of the invention; can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (9)
1. a two-way hybrid DC circuit breaker, comprises main current circuit (1), no-voltage circuit (2), null-current circuit (3), energy absorption circuit (4), system wiring end J1 and J2, it is characterized in that:
Described main current circuit (1), no-voltage circuit (2), null-current circuit (3) and energy absorption circuit (4) are in parallel, first connecting end of parallel circuits is connected with described system wiring end J1, and the second connecting end of parallel circuits is connected with described system wiring end J2;
Described main current circuit (1) comprises mechanical switch S, and described mechanical switch S is the Fast mechanical switch realized based on electromagnetic repulsion force principle;
Described no-voltage circuit (2) comprises reverse parallel connection to realize thyristor T1 and T2 of two-way through-flow function;
Described null-current circuit (3) comprises the two--way pulse current circuit be made up of recharged capacitance C, inductance L and thyristor bridge; Described thyristor bridge is the bridge circuit be made up of thyristor T3, T4, T5 and T6, the connecting end of described thyristor T5 and T6 is as the DC side positive pole of bridge circuit, the connecting end of described thyristor T3 and T4 is as the DC side negative pole of bridge circuit, the connecting end of described thyristor T3 with T5 exchanges end as first of bridge circuit, and the connecting end of described thyristor T4 with T6 exchanges end as second of bridge circuit; The series circuit that described electric capacity C and inductance L series connection are formed is connected across the DC side of thyristor bridge, one end of described electric capacity C is connected with the DC side negative pole of described bridge circuit, as the positive pole of pre-charge voltage, one end of described inductance L is connected with the DC side positive pole of described bridge circuit; First of described bridge circuit exchanges end and is connected with the first connecting end of described parallel circuits, and second of described bridge circuit exchanges end and is connected with the second connecting end of described parallel circuits;
Described energy absorption circuit (4) comprises metal oxide piezo-resistance MOV.
2. a control method for two-way hybrid DC circuit breaker as claimed in claim 1, it is characterized in that, step is as follows:
A), system is when normally running, and direct current is born by mechanical switch S completely, and thyristor T1 or T2 turns off;
B), after system is short-circuited fault, mechanical switch S disjunction, flow to according to short circuit current, thyristor T1 or T2 conducting, under the effect of mechanical switch S breaking arc, short circuit current is forced to shift rapidly to thyristor T1 or T2 from mechanical switch S;
C), after short circuit current is transferred to thyristor T1 or T2 completely, when time delay to the contact of mechanical switch S is separated into and enough opens distance, according to current direction, T4-T5 or the conducting of T3-T6 brachium pontis in thyristor bridge, electric capacity C produces pulse current by inductance L electric discharge, forces the electric current in T1 or T2 to be reduced to zero;
D), when thyristor T1 or T2 current over-zero close have no progeny, system busbar is to electric capacity C reverse charging, and cause circuit breaker both end voltage constantly to increase from back-pressure to malleation, short circuit current equals capacitance charging current;
E), when circuit breaker both end voltage be increased to piezo-resistance MOV open value after, piezo-resistance MOV conducting absorption system energy over-voltage, realize the restriction of fault current and finally make it be reduced to zero.
3. the control method of a kind of two-way hybrid DC circuit breaker according to claim 2, is characterized in that, further comprising the steps of:
When system power flows to system wiring end J2 from system wiring end J1, in breaking course, thyristor T1 conducting, causes T4-T5 brachium pontis conducting in thyristor bridge; When system power flows to system wiring end J1 from system wiring end J2, in breaking course, thyristor T2 conducting, causes T3-T6 brachium pontis conducting in thyristor bridge.
4. the control method of a kind of two-way hybrid DC circuit breaker according to claim 2, is characterized in that, further comprising the steps of:
Be transferred to thyristor T1 or T2 completely from short circuit current, to thyristor T1 or before the T2 current over-zero moment, mechanical switch S both end voltage is the minimum on-state voltage drop of thyristor, has the sufficient medium recovery time after mechanical switch S arc.
5. the control method of a kind of two-way hybrid DC circuit breaker according to claim 2, is characterized in that, further comprising the steps of:
First bear larger reverse voltage after thyristor T1 or T2 current over-zero, then gradually become forward voltage.
6. a control method for two-way hybrid DC circuit breaker as claimed in claim 1, it is characterized in that, step is as follows:
A), in thyristor bridge when T4-T5 or the conducting of T3-T6 brachium pontis, thyristor T2 or T1 conducting also continue for some time, when after thyristor T1 or T2 current over-zero, and impulse discharge current afterflow from T2 or T1 of electric capacity C;
B), after thyristor T2 or T1 afterflow terminate, system busbar is to electric capacity C reverse charging, and cause circuit breaker both end voltage constantly to increase, short circuit current equals capacitance charging current;
C), when circuit breaker both end voltage be increased to piezo-resistance MOV open value after, piezo-resistance MOV conducting absorption system energy over-voltage, realize the restriction of fault current and finally make it be reduced to zero.
7. the control method of a kind of two-way hybrid DC circuit breaker according to claim 6, is characterized in that, further comprising the steps of:
In breaking course, when in thyristor bridge during the conducting of T4-T5 brachium pontis, thyristor T2 conducting afterflow; When in thyristor bridge during the conducting of T3-T6 brachium pontis, thyristor T1 conducting afterflow.
8. the control method of a kind of two-way hybrid DC circuit breaker according to claim 6, is characterized in that, further comprising the steps of:
Be transferred to thyristor T1 or T2 completely from short circuit current, to thyristor T2 or before T1 afterflow finish time, mechanical switch S both end voltage is the minimum on-state voltage drop of thyristor, has the medium recovery time more fully after mechanical switch S arc.
9. the control method of a kind of two-way hybrid DC circuit breaker according to claim 6, is characterized in that, further comprising the steps of:
First the reverse voltage that voltage equals the described minimum on-state voltage drop of thyristor T2 or T1 is born after described thyristor T1 or T2 current over-zero, after described thyristor T2 or T1 afterflow terminate, described mechanical switch S both end voltage becomes forward, avoids larger reverse voltage to have a negative impact to system.
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