CN105281289B - A kind of two-way hybrid dc circuit breaker and its control method - Google Patents

A kind of two-way hybrid dc circuit breaker and its control method Download PDF

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Publication number
CN105281289B
CN105281289B CN201510819311.5A CN201510819311A CN105281289B CN 105281289 B CN105281289 B CN 105281289B CN 201510819311 A CN201510819311 A CN 201510819311A CN 105281289 B CN105281289 B CN 105281289B
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thyristor
circuit
current
bridge
voltage
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CN201510819311.5A
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Chinese (zh)
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CN105281289A (en
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彭振东
杨晨光
任志刚
姜楠
朱红桥
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中国船舶重工集团公司第七一二研究所
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Abstract

The invention discloses a kind of two-way hybrid dc circuit breaker, composed in parallel by main current circuit, no-voltage circuit, null-current circuit and energy absorption circuit, main current circuit uses mechanical switch, no-voltage circuit is the ovonic switch being made of reverse parallel connection thyristor, null-current circuit is to include the two--way pulse current circuit that recharged capacitance, inductance and thyristor bridge are formed, energy absorption circuit uses metal oxide varistor, also discloses its control method.No-voltage circuit of the present invention uses thyristor, and on-state voltage drop is small, and electric current transfer velocity is fast, and mechanical switch has the sufficient medium recovery time, and medium recovery is reliable after arc;Rapidly switching off for thyristor, breaker strong breaking capacity are realized using null-current circuit;Conveniently realize two kinds of operating modes, the working performance of breaker is easy to improve.The present invention is suitable for the bidirectional DC power system failure and protects, have the advantages that it is long-term it is through-flow be lost small, disjunction be swift in motion it is high with functional reliability.

Description

A kind of two-way hybrid dc circuit breaker and its control method

Technical field

The invention belongs to electric power system fault protection technique field, and in particular to a kind of two-way hybrid dc circuit breaker, And its control method.

Background technology

Direct current power system because its it is notable the advantages of, in recent years ship, mine, track traffic and generation of electricity by new energy lead The application in domain is more and more extensive.As the increasingly stringent power quality of the continuous development of direct current power system and user requires, Traditional mechanical chopper is difficult to the specific demand for meeting modern high-capacity direct current electric network protection, and there is an urgent need to can be fast and reliable The novel protected equipment of disjunction DC circuit.

The DC solid circuit breaker realized using pure semiconductor switch, as shown in Figure 1, real using full-control type semiconductor devices The long-term through-flow and fault current disjunction of existing system, has the advantages that the quick disjunction DC current of no arc, but its breaking capacity It is relatively low, and the loss of system longtime running is excessive.

Hybrid circuit breaker includes mechanical switch and semiconductor switch at the same time, have both the good static properties of mechanical switch and The excellent dynamic characteristic of semiconductor switch.

The Zero Current Switch being made of Fast mechanical switch and LC forced commutation circuits, as shown in Fig. 2, occurring in system short After the failure of road, discharged by recharged capacitance and fault current is transferred to LC converter circuits, realize mechanical switch current over-zero point It is disconnected.Since the di/dt in high current breaking course during mechanical switch current over-zero is very high, medium is caused after arc to be difficult to quick extensive It is multiple, therefore Zero Current Switch high current reliable breaking is relatively low.

The zero voltage switch being made of Fast mechanical switch and Turn-off semiconductor device (IGBT etc.), as shown in figure 3, sharp The electric arc caused by mechanical switch disjunction, forces electric current to be shifted into semiconductor devices, realizes mechanical switch current over-zero point It is disconnected.Since arc voltage is relatively low, Turn-off semiconductor device on-state voltage drop is larger, close-coupled between commutating circuit is usually required that To reduce stray inductance, the fast transfer of fault current is realized.When making electric current transfer time long because circuit design is unreasonable, The short circuit current flow being finally transferred in semiconductor devices is very big, can exceed that the turn-off capacity of semiconductor devices, cause breaker Disjunction fails.

The content of the invention

The shortcomings that in order to overcome the prior art and deficiency, an object of the present invention are to provide one kind and are opened with reference to Quick mechanical Close and thyristor while the two-way hybrid dc circuit breaker comprising no-voltage and the hybrid disjunction thought of zero current.

The technical solution adopted by the present invention to solve the technical problems is:A kind of two-way hybrid dc circuit breaker, including Main current circuit, no-voltage circuit, null-current circuit, energy absorption circuit, system wiring end J1 and J2, the principal current Circuit, no-voltage circuit, null-current circuit and energy absorption circuit are in parallel, the first connecting end of parallel circuit and the system Terminals J1 connections, the second connecting end of parallel circuit are connected with the system wiring end J2;The main current circuit bag It is the Fast mechanical switch realized based on electromagnetic repulsion force principle to include mechanical switch S, the mechanical switch S;The no-voltage Circuit includes reverse parallel connection to realize the thyristor T1 and T2 of two-way through-flow function;The null-current circuit is included by being pre-charged The two--way pulse current circuit that capacitance C, inductance L and thyristor bridge are formed;The thyristor bridge is by thyristor T3, T4, T5 The bridge circuit formed with T6, the DC side cathode of the connecting end of the thyristor T5 and T6 as bridge circuit are described DC side anode of the connecting end of thyristor T3 and T4 as bridge circuit, the connecting end of the thyristor T3 and T5 are as bridge First exchange end of formula circuit, the thyristor T4 exchange end with the connecting end of T6 as the second of bridge circuit;Described Capacitance C and inductance L series circuits to be formed of connecting are connected across the DC side of thyristor bridge, one end of the capacitance C with it is described The DC side anode of bridge circuit be connected, as the cathode of pre-charge voltage, one end of the inductance L and the bridge-type The DC side cathode of circuit is connected;First exchange end of the bridge circuit and the first connecting end of the parallel circuit connect Connect, the second exchange end of the bridge circuit is connected with the second connecting end of the parallel circuit;The energy absorption Circuit includes metal oxide varistor MOV.

The second object of the present invention is to provide a kind of control method of two-way hybrid dc circuit breaker.

The technical solution adopted by the present invention to solve the technical problems is:

A kind of control method of two-way hybrid dc circuit breaker, step are as follows:

A), during system normal operation, DC current is undertaken by mechanical switch S completely, thyristor T1 or T2 shut-off;

B), after short trouble occurs for system, mechanical switch S disjunctions, flow to according to short circuit current flow, and thyristor T1 or T2 are led Logical, under the action of mechanical switch S breaking arcs, short circuit current flow is forced into thyristor T1 or T2 to turn rapidly from mechanical switch S Move;

C), after short circuit current flow is transferred to thyristor T1 or T2 completely, the contact being delayed to mechanical switch S is separated into foot Enough open away from when, according to current direction, T4-T5 or the conducting of T3-T6 bridge arms in thyristor bridge, capacitance C pass through inductance L electric discharge productions Raw pulse current, forces the electric current in T1 or T2 to be reduced to zero;

D), after thyristor T1 or T2 current over-zero turn off, system busbar causes breaker two to capacitance C reverse chargings Terminal voltage constantly increases from back-pressure to positive pressure, and short circuit current flow is equal to capacitance charging current;

E), when breaker both end voltage increases to after opening value of varistor MOV, varistor MOV conductings absorb system System energy and over-voltage, realize the limitation to fault current and finally it is reduced to zero.

A kind of control method of the two-way hybrid dc circuit breaker, it is further comprising the steps of:When system power from When system wiring end J1 flows to system wiring end J2, in breaking course, thyristor T1 conductings, cause T4-T5 bridges in thyristor bridge Arm turns on;When system power flows to system wiring end J1 from system wiring end J2, in breaking course, thyristor T2 conductings, cause Turn on T3-T6 bridge arms in thyristor bridge.

A kind of control method of the two-way hybrid dc circuit breaker, it is further comprising the steps of:It is complete from short circuit current flow Total transfer is to thyristor T1 or T2, and to before thyristor T1 or T2 the current over-zero moment, mechanical switch S both end voltages are thyristor Minimum on-state voltage drop, has the sufficient medium recovery time after mechanical switch S arcs.

A kind of control method of the two-way hybrid dc circuit breaker, it is further comprising the steps of:Thyristor T1 or T2 Larger backward voltage is first subject to after current over-zero, then gradually becomes forward voltage.

A kind of control method of two-way hybrid dc circuit breaker, step are as follows:

A when), T4-T5 or T3-T6 bridge arms turn in thyristor bridge, thyristor T2 or T1 are turned on and are continued one section Time, after thyristor T1 or T2 current over-zero, impulse discharge current afterflow from T2 or T1 of capacitance C;

B), after thyristor T2 or T1 afterflow, system busbar causes breaker both ends electric capacitance C reverse chargings Pressure is continuously increased, and short circuit current flow is equal to capacitance charging current;

C), when breaker both end voltage increases to after opening value of varistor MOV, varistor MOV conductings absorb system System energy and over-voltage, realize the limitation to fault current and finally it is reduced to zero.

A kind of control method of the two-way hybrid dc circuit breaker, it is further comprising the steps of:In breaking course, when When T4-T5 bridge arms turn in thyristor bridge, thyristor T2 conducting afterflows;When T3-T6 bridge arms turn in thyristor bridge, brilliant lock Pipe T1 turns on afterflow.

A kind of control method of the two-way hybrid dc circuit breaker, it is further comprising the steps of:It is complete from short circuit current flow Total transfer is to thyristor T1 or T2, and to before thyristor T2 or T1 afterflow finish time, mechanical switch S both end voltages are thyristor Minimum on-state voltage drop, has the more fully medium recovery time after mechanical switch S arcs.

A kind of control method of the two-way hybrid dc circuit breaker, it is further comprising the steps of:The thyristor The backward voltage that voltage is equal to the minimum on-state voltage drop of thyristor T2 or T1 is first subject to after T1 or T2 current over-zeros, works as institute After thyristor T2 or the T1 afterflow stated, the mechanical switch S both end voltages are changed into positive, avoid larger backward voltage pair System has a negative impact.

The beneficial effects of the invention are as follows:

1st, no-voltage circuit uses thyristor, and on-state voltage drop is small, and electric current transfer velocity is fast;

2nd, mechanical switch has the sufficient medium recovery time, and medium recovery is reliable after arc;

3rd, rapidly switching off for thyristor, breaker strong breaking capacity are realized using null-current circuit;

4th, two kinds of operating modes are conveniently realized, the working performance of breaker is easy to improve.

Brief description of the drawings

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 the 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 electricity Road, J1-system wiring end, J2-system wiring end, S-controlling switch.

Embodiment

The present invention is described in further detail below in conjunction with the accompanying drawings.

With reference to shown in Fig. 4, the invention discloses a kind of two-way hybrid dc circuit breaker, including the electricity of main current circuit 1, zero Volt circuit 2, null-current circuit 3, energy absorption circuit 4, system wiring end J1 and system wiring end J2, wherein:

Main current circuit 1, no-voltage circuit 2, null-current circuit 3 and the parallel connection of energy absorption circuit 4, parallel circuit The first connecting end be connected with the system wiring end J1, the second connecting end of parallel circuit and the system wiring end J2 Connection;

The main current circuit 1, which includes mechanical switch S, the mechanical switch S, to be realized based on electromagnetic repulsion force principle Fast mechanical switch;

The no-voltage circuit 2 includes reverse parallel connection to realize the thyristor T1 and T2 of two-way through-flow function;

The null-current circuit 3 includes the Bipolar pulse current being made of recharged capacitance C, inductance L and thyristor bridge Circuit;The thyristor bridge is the bridge circuit being made of thyristor T3, T4, T5 and T6, the thyristor T5's and T6 DC side cathode of the connecting end as bridge circuit, the DC side of the connecting end of the thyristor T3 and T4 as bridge circuit The connecting end of anode, the thyristor T3 and T5 exchange end as the first of bridge circuit, the thyristor T4's and T6 Connecting end exchanges end as the second of bridge circuit;The capacitance C and inductance L series circuits to be formed of connecting are connected across brilliant lock The DC side of pipe bridge, one end of the capacitance C is connected with the DC side anode of the bridge circuit, as pre-charge voltage Cathode, one end of the inductance L is connected with the DC side cathode of the bridge circuit;The first of the bridge circuit Exchange end is connected with the first connecting end of the parallel circuit, the second of the bridge circuit exchange end with it is described in parallel The second connecting end connection of circuit;The energy absorption circuit 4 includes metal oxide varistor MOV.

A kind of control method of two-way hybrid dc circuit breaker, step are as follows:A), during system normal operation, direct current Stream is undertaken by mechanical switch S completely, thyristor T1(Or T2)Shut-off;B), after short trouble occurs for system, S points of mechanical switch It is disconnected, flowed to according to short circuit current flow, thyristor T1(Or T2)Conducting, under the action of mechanical switch S breaking arcs, short circuit current flow quilt Compel from mechanical switch S to thyristor T1(Or T2)In shift rapidly;C), when short circuit current flow is transferred to thyristor T1 completely(Or T2) Afterwards, the contact being delayed to mechanical switch S be separated into open enough away from when, according to current direction, T4-T5 in thyristor bridge(Or T3—T6)Bridge arm turns on, and capacitance C is discharged by inductance L produces pulse current, forces T1(Or T2)In electric current be reduced to zero; D), as thyristor T1(Or T2)After current over-zero shut-off, system busbar causes breaker both end voltage to capacitance C reverse chargings Constantly increase from back-pressure to positive pressure, short circuit current flow is equal to capacitance charging current;E), when breaker both end voltage increase to it is pressure-sensitive Resistance MOV open value after, varistor MOV conducting absorption system energy and over-voltage, realizes the limit to fault current Make and finally it is reduced to zero.

When system power flows to system wiring end J2 from system wiring end J1, in breaking course, thyristor T1 conductings, cause Turn on T4-T5 bridge arms in thyristor bridge;When system power flows to system wiring end J1 from system wiring end J2, disjunction Cheng Zhong, thyristor T2 are turned on, and cause T3-T6 bridge arms in thyristor bridge to turn on.

It is transferred to thyristor T1 completely from short circuit current flow(Or T2), to thyristor T1(Or T2)Before the current over-zero moment, Mechanical switch S both end voltages are the minimum on-state voltage drop of thyristor, have the sufficient medium recovery time after mechanical switch S arcs.

Thyristor T1(Or T2)Larger backward voltage is first subject to after current over-zero, then gradually becomes forward voltage, Larger backward voltage helps to reduce the turn-off time of thyristor T1 (or T2).

Embodiment 1

It is shown in Figure 5, work in the first operating mode for two-way hybrid dc circuit breaker disclosed by the invention, be System electric current from system wiring end J1 flow to system wiring end J2 when equivalent circuit.Breaking course is as follows:

With reference to shown in Fig. 6,t<t 0Stage, mechanical switch S are in closure state, and load current is flowed from mechanical switch S Cross,t=t 0Short trouble, mechanical switch S electric currents occur for moment, systemi SWith short circuit current flowi 0Increase begin to ramp up;

t=t 1Moment, mechanical switch S disjunctions, while thyristor T1 are turned on, and under the action of arc voltage, electric current is forced Shifted from mechanical switch S into thyristor T1, as a resulti SReduce,i T1Increase;

t=t 2Moment, electric current are transferred in thyristor T1 completely, and mechanical switch S electric currents are zero, and hereafter short circuit current flow is complete Undertaken entirely by thyristor T1,i 0Gradually increase;

t=t 3Moment, mechanical switch S contacts reach enough and open away from T4-T5 bridge arms turn in thyristor bridge, capacitance C Discharged by inductance L and produce pulse high current, the circuit for forcing the electric current in thyristor T1 gradually to be connected to inductance L and capacitance C (Hereinafter referred to as L-C circuits)Middle transfer, as a resulti T1Reduce,i CIncrease;

t=t 4Moment, thyristor T1 electric currents are reduced to zero, and hereafter short circuit current flow is undertaken by L-C circuits completely,i 0With electricity Hold the reverse charging electric current of Ci CGradually increase, capacitance C voltageu CWith whole circuit breaker voltageu 0Gradually increase from back-pressure to positive pressure;

t=t 5Moment, since the reverse charging process of capacitance C makes circuit breaker voltageu 0Reach system power source voltage, as a result Short circuit current flowi 0Reach peak value, hereafter with voltageu 0Be continuously increased, short circuit current flowi 0Start to reduce;

t=t 6Moment, circuit breaker voltageu 0Increase to the value of opening of varistor MOV, varistor MOV opens energy-absorbing simultaneously System overvoltage is limited, electric current is shifted from L-C circuits into MOV, as a resulti MOVIncrease, i CReduce;

t=t 7Moment, L-C circuital currentsi CIt is reduced to zero, T4-T5 bridge arms turn off in thyristor bridge, varistor MOV Electric currenti MOVReach peak value, corresponding circuit breaker voltageu 0And capacitance voltageu CVoltage reaches maximum;

Hereafter short circuit current flow is undertaken by varistor MOV completely, as straight-flow system energy is constantly inhaled by varistor MOV Receive, short circuit current flowi 0With electric currenti MOVIt is gradually reduced, finally existst=t 8Moment energy absorption finishes, and electric current is reduced to zero, disjunction Process terminates, circuit breaker voltageu 0It is down to system power source voltage.

In above-mentioned breaking course, at the momentt 2Witht 4Period, mechanical switch S electric currents are zero, and voltage is minimum for thyristor T1 On-state voltage drop, has the sufficient medium recovery time after mechanical switch S arcs;t 4Larger reverse in thyristor T1 both ends after moment Voltage helps to reduce the turn-off time of thyristor T1.

When system power flows to system wiring end J1 from system wiring end J2, according in above-mentioned steps successively control figure 4 T3-T6 bridge arms act in mechanical switch S, thyristor T2 and thyristor bridge.

A kind of control method of two-way hybrid dc circuit breaker, step are as follows:A), T4-T5 in thyristor bridge(Or T3—T6)When bridge arm turns on, thyristor T2(Or T1)Turn on and continue for some time, as thyristor T1(Or T2)Current over-zero Afterwards, the impulse discharge current of capacitance C is from T2(Or T1)Middle afterflow;B), as thyristor T2(Or T1)After afterflow, system busbar To capacitance C reverse chargings, breaker both end voltage is caused to be continuously increased, short circuit current flow is equal to capacitance charging current;C open circuit), is worked as Device both end voltage increase to varistor MOV open value after, varistor MOV conducting absorption system energy simultaneously limited electricity Pressure, realizes the limitation to fault current and finally it is reduced to zero.

In breaking course, when T4-T5 bridge arms turn in thyristor bridge, thyristor T2 conducting afterflows;When in thyristor bridge When T3-T6 bridge arms turn on, thyristor T1 conducting afterflows.

It is transferred to thyristor T1 to T2 completely from short circuit current flow(Or T2 to T1)During afterflow terminates, mechanical switch S both ends Voltage is the minimum on-state voltage drop of thyristor, has the more fully medium recovery time after mechanical switch S arcs.

Thyristor T1(Or T2)Voltage is first subject to after current over-zero and is equal to thyristor T2(Or T1)Minimum on-state voltage drop Backward voltage, as thyristor T2(Or T1)After afterflow, mechanical switch S both end voltages are changed into positive, avoid larger reversely electricity Pressure has a negative impact system.

Embodiment 2

It is shown in Figure 7, work in second of operating mode for two-way hybrid dc circuit breaker disclosed by the invention, be System electric current from system wiring end J1 flow to system wiring end J2 when equivalent circuit.

With reference to shown in Fig. 8, its breaking course existst=t 3Before moment with the complete phase of the first operating mode in embodiment 1 Together;

t=t3Moment, mechanical switch S contacts reach enough and open away from T4-T5 bridge arms and thyristor T2 in thyristor bridge Simultaneously turn on, capacitance C is discharged by inductance L produces pulse high current, forces electric current in thyristor T1 gradually into L-C circuits Transfer, as a resulti T1Reduce,i CIncrease;

Since thyristor T1 is constantly in conducting state, it is backward voltage to cause thyristor T2 both end voltages, although T2 has Continuity signal, but there is no electric current to flow through before T1 electric currents are reduced to zero;

t=t 4Moment, thyristor T1 current over-zeros shut-off, since the Continuity signal of thyristor T2 is continued until T1 electricity After stream is zero, thereforet 4T2 bears forward voltage conducting, impulse discharge current afterflow from T2 of capacitance C after moment;

During the afterflow of thyristor T2, capacitance C voltageu CGradually increase from back-pressure to positive pressure, whole breaker both ends Voltageu 0Clamped down on by the on-state voltage drop of thyristor T2 in extremely low level;

t=t 5Moment, the impulse discharge current of capacitance Ci CIt is reduced to after peak value and system short-circuit electric currenti 0It is equal, Thyristor T2 current over-zeros are caused to turn off, afterflow process terminates;

Hereafter short circuit current flow is undertaken by L-C circuits completely,i 0With the reverse charging electric current of capacitance Ci CGradually increase, capacitance C voltageu CAnd circuit breaker voltageu 0Gradually increase;

t=t 6Moment, since the reverse charging process of capacitance C makes circuit breaker voltageu 0Reach system power source voltage, as a result Short circuit current flowi 0Reach peak value, hereafter with voltageu 0Be continuously increased, short circuit current flowi 0Start to reduce;

t=t 7Moment, circuit breaker voltageu 0Increase to the value of opening of varistor MOV, varistor MOV opens energy-absorbing simultaneously System overvoltage is limited, electric current is shifted from L-C circuits into MOV, as a resulti MOVIncrease, i CReduce;

t=t 8Moment, L-C circuital currentsi CIt is reduced to zero, T4-T5 bridge arms turn off in thyristor bridge, varistor MOV Electric currenti MOVReach peak value, corresponding circuit breaker voltageu 0And capacitance voltageu CVoltage reaches maximum;

Hereafter short circuit current flow is undertaken by varistor MOV completely, as straight-flow system energy is constantly inhaled by varistor MOV Receive, short circuit current flowi 0With electric currenti MOVIt is gradually reduced, finally existst=t 9Moment energy absorption finishes, and electric current is reduced to zero, disjunction Process terminates, circuit breaker voltageu 0It is down to system power source voltage.

In the above process, since thyristor T2 turns on afterflow, at the momentt 2Witht 5Period, mechanical switch S electric currents are zero, electricity Press as on-state voltage drop minimum thyristor T1, there is the more fully medium recovery time after mechanical switch S arcs;Breaker both ends Be not in larger backward voltage, avoid adversely affecting to system band.

When system power flows to system wiring end J1 from system wiring end J2, according in above-mentioned steps successively control figure 4 T3-T6 bridge arms and thyristor T1 actions in mechanical switch S, thyristor T2, thyristor bridge.

Therefore the present invention by using the minimum thyristor of on-state voltage drop as no-voltage change of current semiconductor devices, it can be achieved that The fast transfer of short circuit current flow;The medium recovery time after sufficient arc is provided for mechanical switch S, it is ensured that medium Trusted recovery;It is logical Cross LC null-current circuits to rapidly switch off no-voltage commutated thyristor, improve the breaking capacity of breaker;Can be more convenient Two kinds of operating modes are realized on ground, improve the working performance of breaker.

The above-described embodiments merely illustrate the principles and effects of the present invention, and the embodiment that part uses, for For those of ordinary skill in the art, without departing from the concept of the premise of the invention, can also make it is some deformation and Improve, these belong to protection scope of the present invention.

Claims (9)

1. a kind of two-way hybrid dc circuit breaker, including main current circuit(1), no-voltage circuit(2), null-current circuit(3)、 Energy absorption circuit(4), system wiring end J1 and J2, it is characterised in that:
The main current circuit(1), no-voltage circuit(2), null-current circuit(3)And energy absorption circuit(4)Parallel connection, it is in parallel First connecting end of circuit is connected with the system wiring end J1, the second connecting end of parallel circuit and the system wiring Hold J2 connections;
The main current circuit(1)Including mechanical switch S, the mechanical switch S is realized based on electromagnetic repulsion force principle Fast mechanical switch;
The no-voltage circuit(2)Including reverse parallel connection to realize the thyristor T1 and T2 of two-way through-flow function;
The null-current circuit(3)Including the two--way pulse galvanic electricity being made of recharged capacitance C, inductance L and thyristor bridge Road;The thyristor bridge is the bridge circuit being made of thyristor T3, T4, T5 and T6, the connection of the thyristor T5 and T6 DC side cathode of the end as bridge circuit is tied, the connecting end of the thyristor T3 and T4 are born as the DC side of bridge circuit The connecting end of pole, the thyristor T3 and T5 exchange end, the connection of the thyristor T4 and T6 as the first of bridge circuit Tie second exchange end of the end as bridge circuit;The capacitance C and inductance L series circuits to be formed of connecting are connected across thyristor The DC side of bridge, one end of the capacitance C is connected with the DC side anode of the bridge circuit, as pre-charge voltage Cathode, one end of the inductance L are connected with the DC side cathode of the bridge circuit;The first of the bridge circuit is handed over Stream end is connected with the first connecting end of the parallel circuit, the second exchange end of the bridge circuit and the electricity in parallel The second connecting end connection on road;
The energy absorption circuit(4)Including metal oxide varistor MOV.
2. a kind of control method of two-way hybrid dc circuit breaker as claimed in claim 1, it is characterised in that step is such as Under:
A), during system normal operation, DC current is undertaken by mechanical switch S completely, thyristor T1 or T2 shut-off;
B), after short trouble occurs for system, mechanical switch S disjunctions, flow to according to short circuit current flow, thyristor T1 or T2 conducting, Under the action of mechanical switch S breaking arcs, short circuit current flow is forced to shift rapidly into thyristor T1 or T2 from mechanical switch S;
C), after short circuit current flow is transferred to thyristor T1 or T2 completely, the contact that is delayed to mechanical switch S is separated into be opened enough Away from when, according to current direction, T4-T5 or the conducting of T3-T6 bridge arms in thyristor bridge, capacitance C pass through inductance L electric discharges and produce arteries and veins Electric current is rushed, forces the electric current in T1 or T2 to be reduced to zero;
D), after thyristor T1 or T2 current over-zero turn off, system busbar causes breaker both ends electric capacitance C reverse chargings Pressure constantly increases from back-pressure to positive pressure, and short circuit current flow is equal to capacitance charging current;
E), when breaker both end voltage increases to after opening value of varistor MOV, varistor MOV conducting absorption system energy Simultaneously over-voltage is measured, the limitation to fault current is realized and finally it is reduced to zero.
3. the control method of a kind of two-way hybrid dc circuit breaker according to claim 2, it is characterised in that further include Following steps:
When system power flows to system wiring end J2 from system wiring end J1, in breaking course, thyristor T1 conductings, cause crystalline substance T4-T5 bridge arms turn in brake tube bridge;When system power flows to system wiring end J1 from system wiring end J2, in breaking course, Thyristor T2 is turned on, and causes T3-T6 bridge arms in thyristor bridge to turn on.
4. the control method of a kind of two-way hybrid dc circuit breaker according to claim 2, it is characterised in that further include Following steps:
It is transferred to thyristor T1 or T2 completely from short circuit current flow, to before thyristor T1 or T2 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 arcs.
5. the control method of a kind of two-way hybrid dc circuit breaker according to claim 2, it is characterised in that further include Following steps:
Larger backward voltage is first subject to after thyristor T1 or T2 current over-zero, then gradually becomes forward voltage.
6. a kind of control method of two-way hybrid dc circuit breaker as claimed in claim 1, it is characterised in that step is such as Under:
A when), T4-T5 or T3-T6 bridge arms turn in thyristor bridge, thyristor T2 or T1 are turned on and continued for some time, After thyristor T1 or T2 current over-zero, impulse discharge current afterflow from T2 or T1 of capacitance C;
B), after thyristor T2 or T1 afterflow, system busbar causes breaker both end voltage not to capacitance C reverse chargings Disconnected increase, short circuit current flow are equal to capacitance charging current;
C), when breaker both end voltage increases to after opening value of varistor MOV, varistor MOV conducting absorption system energy Simultaneously over-voltage is measured, the limitation to fault current is realized and finally it is reduced to zero.
7. the control method of a kind of two-way hybrid dc circuit breaker according to claim 6, it is characterised in that further include Following steps:
In breaking course, when T4-T5 bridge arms turn in thyristor bridge, thyristor T2 conducting afterflows;When T3 in thyristor bridge- When T6 bridge arms turn on, thyristor T1 conducting afterflows.
8. the control method of a kind of two-way hybrid dc circuit breaker according to claim 6, it is characterised in that further include Following steps:
It is transferred to thyristor T1 or T2 completely from short circuit current flow, to before thyristor T2 or T1 afterflow finish time, mechanical switch S Both end voltage is the minimum on-state voltage drop of thyristor, has the more fully medium recovery time after mechanical switch S arcs.
9. the control method of a kind of two-way hybrid dc circuit breaker according to claim 6, it is characterised in that further include Following steps:
Voltage is first subject to after thyristor T1 or the T2 current over-zero and is equal to the minimum on-state pressure of thyristor T2 or T1 The backward voltage of drop, after thyristor T2 or the T1 afterflow, the mechanical switch S both end voltages are changed into positive, Larger backward voltage is avoided to have a negative impact system.
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