CN102142673A - Forced shutoff type bridge solid current limiter - Google Patents
Forced shutoff type bridge solid current limiter Download PDFInfo
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- CN102142673A CN102142673A CN2011101201752A CN201110120175A CN102142673A CN 102142673 A CN102142673 A CN 102142673A CN 2011101201752 A CN2011101201752 A CN 2011101201752A CN 201110120175 A CN201110120175 A CN 201110120175A CN 102142673 A CN102142673 A CN 102142673A
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Abstract
The invention discloses a forced shutoff type bridge solid current limiter, comprising a three-phase bridge current limited circuit, a forced shutoff circuit and a charging circuit, wherein the three-phase bridge current limited circuit comprises a three-phase rectifying circuit based on a thyristor, an afterflow loop based on a thyristor or a diode and a direct-current limiting reactor, and is used for controlling switching of the direct-current limiting reactor. The forced shutoff circuit comprises a capacitor and a forced shutoff control thyristor. The charging circuit comprises a charging power supply and a charging diode. In the forced shutoff type bridge solid current limiter, the out-of-control time of the traditional bridge current limiter can be effectively reduced, the direct-current limiting reactance value is reduced, a working mode of all-opening afterflow or diode afterflow of the afterflow thyristor is adopted, the control difficulty is low, the cost is reduced, the structure is simple and the equipment is safe and reliable.
Description
Technical field
The present invention relates to a kind of shutoff type Bridge Type Solid State Current Limiter of forcing, be mainly used in limiting short-circuit current under the short trouble of electric power system, the protection power electronic device is avoided the damage that causes because of short circuit current.
Background technology
Along with the continuous development of society, power load increases sharply, and the user has also proposed more and more higher requirement to power supply quality and reliability etc. thereof simultaneously.For satisfying growing power requirement, the scale of electric power system increasing (comprising the increase of newly-built electrical network and transformation, the enlarging of original electrical network), its structure also becomes increasingly complex.The continuous expansion of scale of power and structure complicated day by day improves constantly short circuit current level on the one hand, increased the configuration difficulty of system installed capacity such as main transformer, circuit breaker etc.; Increased on the other hand the protection cooperation of system short-circuit fault and the difficulty of handling, caused serious hidden danger for safe, the stable and reliability service of system, the restriction that is difficult to go beyond that becomes electric network reconstruction, construction and development is because of rope.
Developing rapidly and the application in real system of power electronic technology and large-capacity power electronics device in recent years, making based on power electronic device exploitation short circuit current limiter becomes possibility.Based on the solid-state current limiter of power electronic device exploitation when the operate as normal, in the current limiting reactor by direct current, no pressure drop, almost do not have a power consumption; During fault, current limiting reactor does not have time-delay and drops into automatically; During failure removal, thyristor turn-offs when current over-zero, can not cause overvoltage and additional vibration; But also can preset the change curve of short circuit current, to satisfy the needs of relay protection of power system by the inversion working method of thyristor bridge; Can realize the soft automatic reclosing of no current impact etc.Be with a wide range of applications.
Summary of the invention
The purpose of this invention is to provide a kind of shutoff type Bridge Type Solid State Current Limiter of forcing,, protect power electronic device to avoid the damage that causes because of short circuit current to reduce thyristor out-of-control time, to reduce current-limiting reactor.
For reaching above-mentioned purpose, the present invention has following two kinds of technical solutions.
Scheme 1
Of the present inventionly force shutoff type Bridge Type Solid State Current Limiter to comprise three-phase bridge rectifier circuit, force breaking circuit and charging circuit.
– three-phase bridge current-limiting circuit comprises: the three-phase bridge rectifier circuit of being made up of six thyristors, the continuous current circuit that is composed in series along polarity by two thyristors, current limiting reactor and three-phase coupling transformer, three of brachium pontis thyristor common cathodes connect on the rectified three-phase circuit, three thyristors of following brachium pontis anode altogether connect, current limiting reactor is connected across common cathode together between the anode, a winding of three-phase coupling transformer is by connecting with shielded load circuit, one end ground connection of each phase winding of secondary side, the mid point of each phase brachium pontis of the other end and rectified three-phase circuit is connected, the tie point ground connection of two thyristors of continuous current circuit, the negative electrode of wherein going up the brachium pontis thyristor is connected with brachium pontis common cathode on the rectified three-phase circuit, and the anode of following brachium pontis thyristor is connected with the common anode of brachium pontis under the rectified three-phase circuit;
– forces breaking circuit to comprise: electric capacity and discharge thyristor, and the negative electrode of discharge thyristor is connected with brachium pontis common cathode on the rectified three-phase circuit, and anode is connected with the positive pole of electric capacity, and the electric capacity negative pole is connected with the common anode of brachium pontis under the rectified three-phase circuit;
The – charging circuit comprises: charge power supply and charging diode, the input termination working power of charge power supply, output is connected with the charging diode anode, the negative electrode of charging diode with force breaking circuit in the positive pole of electric capacity be connected.
Scheme 2
Of the present inventionly force shutoff type Bridge Type Solid State Current Limiter to comprise three-phase bridge rectifier circuit, force breaking circuit and charging circuit.
– three-phase bridge current-limiting circuit comprises: the three-phase bridge rectifier circuit of being made up of six thyristors, the continuous current circuit that is composed in series along polarity by two diodes, current limiting reactor and three-phase coupling transformer, three of brachium pontis thyristor common cathodes connect on the rectified three-phase circuit, three thyristors of following brachium pontis anode altogether connect, current limiting reactor is connected across common cathode together between the anode, a winding of three-phase coupling transformer is by connecting with shielded load circuit, one end ground connection of each phase winding of secondary side, the mid point of each phase brachium pontis of the other end and rectified three-phase circuit is connected, the tie point ground connection of two diodes of continuous current circuit, wherein the negative electrode of diode is connected with brachium pontis common cathode on the rectified three-phase circuit, and the anode of following brachium pontis diode is connected with the common anode of brachium pontis under the rectified three-phase circuit;
– forces breaking circuit to comprise: electric capacity and discharge thyristor, and the negative electrode of discharge thyristor is connected with brachium pontis common cathode on the rectified three-phase circuit, and anode is connected with the positive pole of electric capacity, and the electric capacity negative pole is connected with the common anode of brachium pontis under the rectified three-phase circuit;
The – charging circuit comprises: charge power supply and charging diode, the input termination working power of charge power supply, output is connected with the charging diode anode, the negative electrode of charging diode with force breaking circuit in the positive pole of electric capacity be connected.
When normally moving, obsessional type Bridge Type Solid State Current Limiter of the present invention force the electric capacity in the breaking circuit to be in charged state; in case detect the object of protection fault; the bridge circuit of controlling current limiting reactor at once quits work; force the discharge thyristor in the turn-off circuit open-minded simultaneously; make the bridge circuit discharge of storage capacitor, guarantee that the thyristor of last conducting bears back-pressure and forces shutoff to current limiting reactor.The present invention can effectively reduce the out-of-control time of three-phase bridge rectifier circuit when failure removal, improve the response speed of current limiting reactor, and under the condition that satisfies the current limliting level, reduce required direct current current-limiting inductance value, properly settled the volume and the cost problem of current limiting reactor.Because failure removal speed height, continuous current circuit do not need to consider the contrary feedback behavior of energy, two thyristors of continuous current circuit can adopt standard-sized sheet to lead to the afterflow mode of operation, perhaps directly adopt diode continuousing flow, reduce the quantity of thyristor and control impuls thereof.
Description of drawings
Fig. 1 is the electrical block diagram that forces shutoff type Bridge Type Solid State Current Limiter of scheme 1.
Fig. 2 is the electrical block diagram that forces shutoff type Bridge Type Solid State Current Limiter of scheme 2.
Embodiment
With reference to Fig. 1, of the present inventionly force shutoff type Bridge Type Solid State Current Limiter to comprise three-phase bridge rectifier circuit 1, force breaking circuit 2 and charging circuit 3.
– three-phase bridge current-limiting circuit 1 comprises: by six thyristor T1; T2; T3; T4; T5; the three-phase bridge rectifier circuit that T6 forms; by two thyristor T7; the continuous current circuit that T8 is composed in series along polarity; current limiting reactor Ld and three-phase coupling transformer T; three of brachium pontis thyristor T1 on the rectified three-phase circuit; T3, the T5 common cathode connects, three thyristor T2 of following brachium pontis; T4; T6 altogether anode connects, and current limiting reactor Ld is connected across common cathode together between the anode, and a winding of three-phase coupling transformer is by connecting with shielded load circuit; one end ground connection of each phase winding of secondary side; the mid point of each phase brachium pontis of the other end and rectified three-phase circuit is connected, two thyristor T7 of continuous current circuit, the tie point ground connection of T8; the negative electrode of wherein going up brachium pontis thyristor T7 is connected with brachium pontis common cathode on the rectified three-phase circuit, and the anode of following brachium pontis thyristor T8 is connected with the common anode of brachium pontis under the rectified three-phase circuit.
– forces breaking circuit 2 to comprise: capacitor C and discharge thyristor Tc, and the negative electrode of discharge thyristor Tc is connected with brachium pontis common cathode on the rectified three-phase circuit, and anode is connected with the positive pole of capacitor C, and the capacitor C negative pole is connected with the common anode of brachium pontis under the rectified three-phase circuit.
– charging circuit 3 comprises: charge power supply and charging diode Dc, the input termination working power of charge power supply, output is connected with charging diode Dc anode, the negative electrode of charging diode Dc with force breaking circuit in the positive pole of capacitor C be connected.
Operation principle: when normally moving in system, six thyristor T1 of three-phase bridge rectifier circuit, T2, T3, T4, T5, the T6 standard-sized sheet is logical, load current forms behind over commutation stably that direct current flows through current limiting reactor Ld, makes afterflow thyristor T7, the T8 standard-sized sheet is logical, can provide continuous current circuit for current limiting reactor Ld when load current reduces, make electric current maintain load current peak level (coupling transformer secondary side peak current), direct current pressure drop on the current limiting reactor Ld is zero, and behind over-coupled transformer, current limiting reactor is approximately zero in the whole zero impedance of system side.When load current changed, the DC side electric current can be subjected to the inhibition of current limiting reactor Ld.When the instantaneous reduction of load current, afterflow thyristor T7, T8 are for current limiting reactor Ld provides continuous current circuit, and it is constant to keep current limiting reactor Ld electric current.When the load loop fault, system voltage will partly or entirely be coupled to secondary side through the three-phase coupling transformer, and the DC side electric current will increase under the inhibition of current limiting reactor Ld, at this moment, controller measures direct current above after the set point, close six thyristor T1 of three-phase bridge rectifier circuit at once, T2, T3, T4, T5, the pulse of T6, two thyristors of last conducting will continue to be conducting to current over-zero again from turn-offing.When the three-phase bridge rectifier circuit pulse was closed, afterflow thyristor T7, T8 can open and carry out afterflow, and DC loop is promptly thoroughly turn-offed fault loop after reaching maximum fault current, and inductance energy will slowly decay to zero in continuous current circuit; Afterflow thyristor T7, T8 is along with the shutoff of three-phase bridge rectifier circuit, and current limiting reactor is deactivated, and plays the effect of isolated fault point.Improvement of the present invention is: can detect six thyristor T1 that turn-off three-phase bridge rectifier circuit when fault takes place, T2, T3, T4, T5, the pulse while of T6, the discharge thyristor Tc of closed capacitive branch, make electric capacity to sparking between the common anode of three-phase brachium pontis, the common cathode, make thyristor moment of last conducting in the bridge circuit bear back-pressure and quicken to close.Because by back-pressure is that thyristor turn-offs by force, has reduced the out-of-control time of thyristor, the increase of the energy of current limiting reactor Ld can enter into the afterflow stage very soon much smaller than traditional flow restricter in the whole turn off process.This moment turn-off characteristic that the present invention obtains can turn-off fault loop rapidly, the current limiting reactor responsiveness is obviously promoted, the fault current of limited rising decreases the impact of thyristor, also reduce simultaneously demand to the direct current sensibility reciprocal, and, kept the reliable characteristic of high withstand voltage and high rated current of thyristor, therefore because the present invention is still based on thyristor, not only obtained the advantage on the cost, and had higher reliability than original flow restricter.
With reference to Fig. 2, the shutoff type Bridge Type Solid State Current Limiter of forcing of the present invention comprises: comprise three-phase bridge rectifier circuit 1, force breaking circuit 2 and charging circuit 3.
– three-phase bridge current-limiting circuit 1 comprises: by six thyristor T1; T2; T3; T4; T5; the three-phase bridge rectifier circuit that T6 forms; by two diode D1; the continuous current circuit that D2 is composed in series along polarity; current limiting reactor Ld and three-phase coupling transformer T; three of brachium pontis thyristor T1 on the rectified three-phase circuit; T3, the T5 common cathode connects, three thyristor T2 of following brachium pontis; T4; T6 altogether anode connects, and current limiting reactor Ld is connected across common cathode together between the anode, and a winding of three-phase coupling transformer is by connecting with shielded load circuit; one end ground connection of each phase winding of secondary side; the mid point of each phase brachium pontis of the other end and rectified three-phase circuit is connected, two diode D1 of continuous current circuit, the tie point ground connection of D2; wherein the negative electrode of diode D1 is connected with brachium pontis common cathode on the rectified three-phase circuit, and the anode of following brachium pontis diode D2 is connected with the common anode of brachium pontis under the rectified three-phase circuit.
– forces breaking circuit 2 to comprise: capacitor C and discharge thyristor Tc, and the negative electrode of discharge thyristor Tc is connected with brachium pontis common cathode on the rectified three-phase circuit, and anode is connected with the positive pole of capacitor C, and the capacitor C negative pole is connected with the common anode of brachium pontis under the rectified three-phase circuit.
– charging circuit 3 comprises: charge power supply and charging diode Dc, the input termination working power of charge power supply, output is connected with charging diode Dc anode, the negative electrode of charging diode Dc with force breaking circuit in the positive pole of capacitor C be connected.
Operation principle: when normally moving in system, six thyristor T1 of three-phase bridge rectifier circuit, T2, T3, T4, T5, the T6 standard-sized sheet is logical, load current forms behind over commutation stably that direct current flows through current limiting reactor Ld, sustained diode 1, and D2 can provide continuous current circuit for direct current current-limiting reactor Ld when load current reduces, make the current limiting reactor electric current maintain load current peak level (coupling transformer secondary side peak current), direct current pressure drop on the current limiting reactor Ld is zero, and behind over-coupled transformer, current limiting reactor is approximately zero in the whole zero impedance of system side.When load current changed, the DC side electric current can be subjected to the inhibition of current limiting reactor Ld.When the instantaneous reduction of load current, sustained diode 1, D2 is for current limiting reactor Ld provides continuous current circuit, and it is constant to keep current limiting reactor Ld electric current.When the load loop fault, system voltage will partly or entirely be coupled to secondary side through over-coupled transformer, and the DC side electric current will increase under the inhibition of current limiting reactor Ld, at this moment, controller measures direct current above after the set point, close six thyristor T1 of three-phase bridge rectifier circuit at once, T2, T3, T4, T5, the pulse of T6, two thyristors of last conducting will continue to be conducting to current over-zero again from turn-offing.When the pulse of three-phase brachium pontis is closed, sustained diode 1, the D2 afterflow, DC loop is promptly thoroughly turn-offed fault loop after reaching maximum fault current, and inductance energy will slowly decay to zero in continuous current circuit.The shutoff type Bridge Type Solid State Current Limiter of forcing of the present invention can be turn-offed three-phase bridge rectifier circuit T1 when detecting the fault generation, T2, T3, T4, T5, the pulse of T6 simultaneously, the discharge thyristor Tc of closed capacitive branch makes electric capacity to sparking between the common anode of three-phase brachium pontis, the common cathode, makes thyristor moment of last conducting in the bridge circuit bear back-pressure and quicken to close, the energy of current limiting reactor Ld has increase slightly in the turn off process, and closing has no progeny enters into the afterflow stage very soon.This moment turn-off characteristic that the present invention obtains can turn-off fault loop rapidly, the current limiting reactor responsiveness is obviously promoted, the fault current of limited rising decreases the impact of thyristor, also reduce simultaneously demand to the direct current sensibility reciprocal, and, kept the reliable characteristic of high withstand voltage and high rated current of thyristor, therefore because the present invention is still based on thyristor, not only obtained the advantage on the cost, and had higher reliability than original flow restricter.
Claims (2)
1. force shutoff type Bridge Type Solid State Current Limiter, it is characterized in that: comprise three-phase bridge rectifier circuit (1), force breaking circuit (2) and charging circuit (3);
– three-phase bridge current-limiting circuit (1) comprising: by six thyristor (T1, T2, T3, T4, T5, T6) three-phase bridge rectifier circuit of Zu Chenging, by two thyristor (T7, T8) continuous current circuit that is composed in series along polarity, current limiting reactor (Ld) and three-phase coupling transformer (T), three of brachium pontis thyristor (T1 on the rectified three-phase circuit, T3, T5) common cathode connects, three thyristor (T2 of following brachium pontis, T4, T6) altogether anode connects, and current limiting reactor (Ld) is connected across common cathode together between the anode, and a winding of three-phase coupling transformer is by connecting with shielded load circuit, one end ground connection of each phase winding of secondary side, the mid point of each phase brachium pontis of the other end and rectified three-phase circuit is connected, two thyristors of continuous current circuit (T7, tie point ground connection T8), the negative electrode of wherein going up brachium pontis thyristor (T7) is connected with brachium pontis common cathode on the rectified three-phase circuit, and the anode of following brachium pontis thyristor (T8) is connected with the common anode of brachium pontis under the rectified three-phase circuit;
– forces breaking circuit (2) to comprise: electric capacity (C) and discharge thyristor (Tc), the negative electrode of discharge thyristor (Tc) is connected with brachium pontis common cathode on the rectified three-phase circuit, anode is connected with the positive pole of electric capacity (C), and electric capacity (C) negative pole is connected with the common anode of brachium pontis under the rectified three-phase circuit;
– charging circuit (3) comprising: charge power supply and charging diode (Dc), the input termination working power of charge power supply, output is connected with charging diode (Dc) anode, the negative electrode of charging diode (Dc) with force breaking circuit in the positive pole of electric capacity (C) be connected.
2. force shutoff type Bridge Type Solid State Current Limiter, it is characterized in that: comprise three-phase bridge rectifier circuit (1), force breaking circuit (2) and charging circuit (3);
– three-phase bridge current-limiting circuit (1) comprising: by six thyristor (T1, T2, T3, T4, T5, T6) three-phase bridge rectifier circuit of Zu Chenging, by two diode (D1, D2) continuous current circuit that is composed in series along polarity, current limiting reactor (Ld) and three-phase coupling transformer (T), three of brachium pontis thyristor (T1 on the rectified three-phase circuit, T3, T5) common cathode connects, three thyristor (T2 of following brachium pontis, T4, T6) altogether anode connects, and current limiting reactor (Ld) is connected across common cathode together between the anode, and a winding of three-phase coupling transformer is by connecting with shielded load circuit, one end ground connection of each phase winding of secondary side, the mid point of each phase brachium pontis of the other end and rectified three-phase circuit is connected, two diodes of continuous current circuit (D1, tie point ground connection D2), wherein the negative electrode of diode (D1) is connected with brachium pontis common cathode on the rectified three-phase circuit, and the anode of following brachium pontis diode (D2) is connected with the common anode of brachium pontis under the rectified three-phase circuit;
– forces breaking circuit (2) to comprise: electric capacity (C) and discharge thyristor (Tc), the negative electrode of discharge thyristor (Tc) is connected with brachium pontis common cathode on the rectified three-phase circuit, anode is connected with the positive pole of electric capacity (C), and electric capacity (C) negative pole is connected with the common anode of brachium pontis under the rectified three-phase circuit;
– charging circuit (3) comprising: charge power supply and charging diode (Dc), the input termination working power of charge power supply, output is connected with charging diode (Dc) anode, the negative electrode of charging diode (Dc) with force breaking circuit in the positive pole of electric capacity (C) be connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101201752A CN102142673A (en) | 2011-05-11 | 2011-05-11 | Forced shutoff type bridge solid current limiter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101201752A CN102142673A (en) | 2011-05-11 | 2011-05-11 | Forced shutoff type bridge solid current limiter |
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| CN102142673A true CN102142673A (en) | 2011-08-03 |
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| CN2011101201752A Pending CN102142673A (en) | 2011-05-11 | 2011-05-11 | Forced shutoff type bridge solid current limiter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3200331A1 (en) * | 2016-01-27 | 2017-08-02 | GE Energy Power Conversion Technology Ltd | Method to protect a power converter arrangement and power converter arrangement with a protective device |
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| US5734256A (en) * | 1995-05-31 | 1998-03-31 | General Electric Company | Apparatus for protection of power-electronics in series compensating systems |
| CN101345419A (en) * | 2008-05-14 | 2009-01-14 | 西安交通大学 | Series voltage quality regulator and fast investment and cutting method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3200331A1 (en) * | 2016-01-27 | 2017-08-02 | GE Energy Power Conversion Technology Ltd | Method to protect a power converter arrangement and power converter arrangement with a protective device |
| US10090776B2 (en) | 2016-01-27 | 2018-10-02 | Ge Energy Power Conversion Technology Ltd | Method to protect a power converter arrangement and power converter arrangement with a protective device |
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Application publication date: 20110803 |