CN104901269A - All-solid-state direct current breaker and control method thereof - Google Patents
All-solid-state direct current breaker and control method thereof Download PDFInfo
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Abstract
The invention discloses an all-solid-state direct current circuit breaker and a control method thereof, wherein the all-solid-state direct current circuit breaker is formed by connecting a long-term through-current branch, a current breaking branch and an energy absorption branch in parallel; the current breaking branch circuit is formed by connecting breaking units consisting of a full-control device, an RCD absorption circuit and a lightning arrester in series, and bidirectional through current is realized by adopting a full-bridge circuit; the energy absorption circuit is formed by at least one arrester. The invention has simple and novel topological structure and low on-state loss, reduces the number of fully-controlled devices, and simplifies the complexity and cost of control. The invention has fast fault current clearing speed, and can limit the rising rate of the fault current by utilizing the respective control of the current breaking units, so that the circuit breaker has the current limiting function at the same time, and effectively processes the short circuit and overload faults in the direct current system. And the safe operation of the direct current system is protected.
Description
Technical field
The invention belongs to electric and electronic technical field, be specifically related to a kind of all solid state direct-current breaker topology, and control method.
Background technology
Along with the development of direct current transmission and distribution technology, Traditional DC transmission of electricity and HVDC Light technology become the important directions of following power network development.In multi-terminal direct current transmission system, DC circuit breaker, as fail-safe system, becomes one of visual plant of system safety operation existence.DC circuit breaker, in disengagement failure current course, does not have current zero-crossing point.Therefore, more difficult the development of DC circuit breaker is faced with.
The DC circuit breaker that usual employing mechanical switch is formed, in order to solve the arcing problems in drop-out current process, needing to increase auxiliary oscillating circuit, manufacturing the current zero-crossing point in turn off process, mechanical switch can be turned off under zero current condition.But circuit structure often more complicated and break-time is difficult to meet system requirements.The mixed DC circuit breaker that mechanical switch and solid-state switch are formed, its turn-off characteristic is subject to the restriction of mechanical switch characteristic equally, and the breaking speed for mechanical switch proposes too high requirement.Common all solid state DC circuit breaker, owing to needing the power device of the directly positive multiple full control of anti-series, loss and cost are all higher, and the control coherence request for full control device is also higher.
Summary of the invention
For the deficiencies in the prior art part, the present invention proposes a kind of novel all solid state DC circuit breaker and control method thereof, the present invention has that drop-out current speed is fast, on-state loss is little, control the features such as simple.Meanwhile, the introducing of full-bridge rectification unit, effectively can reduce the quantity of full control device, reduce complexity and the cost of Systematical control.Interruption unitsization design can reduce the technical requirement of directly connecting for device.
To achieve these goals, the present invention realizes by the following technical solutions:
A kind of all solid state DC circuit breaker, is made up of long-term through-flow branch road, electric current disjunction branch road, energy absorption branch circuit parallel connection, it is characterized in that,
At least one half control devices switch unit of a described through-flow for a long time route and at least one full control devices switch units in series are formed, and half control devices switch units in series quantity is determined by system voltage grade; Described half control devices switch unit is all connected with full bridge rectifier with full control devices switch unit, and long-term through-flow branch road adopts full bridge rectifier to realize the two-way flow of electric current;
Described electric current disjunction is propped up the multiple interruption units of route and is composed in series, described interruption units is composed in parallel by unidirectional full control switching device, absorbing circuit, lightning arrester, described parallel circuits is connected with full bridge rectifier, and electric current disjunction branch road adopts bridge rectifier to realize electric current two-way flow;
Described energy absorption branch road, comprises at least one lightning arrester unit, absorbs the system capacity in interrupting process.
The full control devices switch unit of described long-term through-flow branch road, the unidirectional full control switching device of described electric current disjunction branch road, comprise IGBT, all wholly-controled device such as IGCT, IEGT.
The absorbing circuit of described electric current disjunction branch road is the RCD absorbing circuit that resistance, electric capacity and diode are formed, and described lightning arrester is the low voltage surge arrester matched with unidirectional full control switching device voltage, and the residual voltage of lightning arrester is chosen according to the safe operating conditions of device.
Described energy absorption is propped up route lightning arrester unit and is enough become, and determines series and parallel number and the connection in series-parallel syndeton of lightning arrester according to system parameters.
The control method of described all solid state DC circuit breaker, concrete steps are as follows:
1) when system is normal, system power flows through full control devices switch unit and half control devices switch unit successively, and after detecting that system power exceedes current limit value, first system opens whole interruption units of electric current disjunction branch road; Then the full control devices switch unit in the long-term through-flow unit of turning off system, system power transfers to electric current disjunction branch road; Now, the automatic zero passage of half control devices switch cell current in long-term through-flow branch road, the half control device in half control devices switch unit recovers to bear high voltage capability, and long-term through-flow branch road completes commutation course;
2) after long-term through-flow branch road completes commutation course, electric current disjunction branch road, part or all of shutoff interruption units; According to the Current limited Control grade of system, when current overload is lower, part turns off interruption units, the rate of rise of restriction system electric current, if system is only the overload fault of short-term, then again opens long-term through-flow branch road; The sequential opened is: first open full control devices switch unit, then half control devices switch unit is opened in triggering;
3) when current overload is higher, system power exceedes the limit value of setting, or after after cutoff interruption units, system power is still increased beyond the limit value of setting, control strategy closes whole interruption units, thorough cutting system electric current, by the residual amount of energy of energy absorption branch road absorption system.
The closed step that described all solid state direct current circuit breaker system recovers when normally running is:
1) what breaker controller sent electric current disjunction branch road interruption units opens signal, opens electric current disjunction branch road;
2) breaker controller sends long-term through-flow branch road, and signal is opened in the triggering of full control devices switch unit;
3) breaker controller sends long-term through-flow branch road, and signal is opened in the triggering of half control devices switch unit;
4) breaker controller sends the breaking signal of electric current disjunction branch road interruption units.
Compared with prior art, advantage of the present invention is:
1) the present invention proposes a kind of all solid state direct-current breaker topology scheme, under subsidiary loop bears system normal condition, system works electric current, subsidiary loop adopts half control device cell and entirely controls device cell tandem plan, has on-state loss little, feature.
2) all solid state DC circuit breaker scheme of the present invention's proposition, avoids adopting mechanical switch, improves the turn-off speed of circuit breaker significantly.Meanwhile, the introducing of bridge circuit, under the two-way through-flow condition of guarantee, reduces the quantity of half control device, simplifies control complexity.
3) all solid state DC circuit breaker scheme of the present invention's proposition, electric current disjunction branch road adopts interruption units modularized design, wherein interruption units controls device entirely by press-fiting, RCD absorbing circuit, lightning arrester unit is formed, its interruption units has itself well bears overvoltage ability, and security of system is high.
4) all solid state DC circuit breaker scheme of the present invention's proposition, press-fits and entirely controls device, RCD absorbing circuit, and the interruption units that lightning arrester unit is formed can form two-way through-flow unit with full bridge rectifier, has and controls simply, lower-cost advantage.
5) all solid state DC circuit breaker scheme of the present invention's proposition, the interruption units number of series connection can be determined according to system voltage grade, in cutting system current course, partly can turn off interruption units, and the current-limiting apparatus as system uses.The far-end short circuit of effective treatment system, near-end open circuit, the faults such as system overload.
6) all solid state DC circuit breaker scheme that proposes of the present invention, can after system power fault occurs, by cutoff interruption units, can the climbing of fault current limiting, and judge the fault type of system clearly, correct disjunction scheme is provided.
Accompanying drawing explanation
Fig. 1 is all solid state DC circuit breaker topological structure schematic diagram that the present invention proposes.
Fig. 2 is the circuit theory diagrams of all solid state DC circuit breaker that invention proposes.
Fig. 3 is the circuit theory diagrams of the long-term through-flow branch road of all solid state DC circuit breaker that the present invention proposes.
Fig. 4 is the circuit theory diagrams of the electric current disjunction branch road that the present invention proposes.
Fig. 5 is the circuit theory diagrams of the interruption units that the present invention proposes.
Fig. 6 is the circuit theory diagrams of the interruption units two-way flow structure that the present invention proposes.
Fig. 7 is the control system schematic diagram of the solid-state direct-current circuit breaker that the present invention proposes.
In figure, 1-thyristor or other half control switching device 2-rectifier diode 3-modularization are entirely controlled switching device 4-and are press-fited full control switching device 5-press packs body diode or the long-term through-flow branch current detection signal 12-electric current of anti-paralleled diode 6-fast recovery diode 7-low voltage surge arrester 8-absorbing circuit electric capacity 9-absorbing circuit resistance 10-absorbing circuit lightning arrester 11-and cut-off the long-term through-flow branch road of the branch current detection signal 13-energy absorption branch current detection signal 14-long-term through-flow branch road half control device cell control signal 16-interruption units control signal 17-of interruption units control signal 15-and entirely control devices switch unit controls signal 18-interruption units control signal 19-master control system controller and DC circuit breaker controller communication signal
Embodiment
Below in conjunction with accompanying drawing, the embodiment for patent of the present invention is described in further detail.Patent of the present invention belongs to applied power electronics category, is applied to multi-terminal direct current transmission system, and this DC circuit breaker series connection access transmission system, under system short-circuit fault pattern, for the short circuit current of cutting system, removes fault.
See Fig. 1, Fig. 2, all solid state DC circuit breaker is made up of long-term through-flow branch road, electric current disjunction branch road, energy absorption branch circuit parallel connection.The load current in system normal course of operation born by its medium-term and long-term through-flow branch road, and full-bridge rectification structure ensures the two-way through-flow of system, and half control switching device withstand voltage is high, and discharge capacity is large, and through-flow loss is low.The interruption units of electric current disjunction branch road adopts full control switching device to form, in cutout breaking current process, and cutting system electric current.Energy absorption is propped up route lightning arrester and is formed, and divides have no progeny at system power, and energy remaining in absorption system, protects the device safety of long-term through-flow branch road and electric current disjunction branch road.
See Fig. 3, through-flow route controls devices switch unit and half control devices switch units in series formation entirely for a long time, when system is normal, system power flows through full control devices switch unit and half control devices switch unit successively, after detecting that system power exceedes current limit value, first system opens whole interruption units of electric current disjunction branch road.Then the full control devices switch unit in the long-term through-flow unit of turning off system.System power transfers to electric current disjunction branch road.Now, the automatic zero passage of half control devices switch cell current in long-term through-flow branch road, the half control device in half control devices switch unit recovers to bear high voltage capability.Long-term through-flow branch road completes commutation course.
See Fig. 4, electric current disjunction is propped up the multiple interruption units of route and is formed, after long-term through-flow branch road completes commutation course, and electric current disjunction branch road, shutoff interruption units that can be part or all of.According to the Current limited Control grade of system, when current overload is lower, partly can turn off interruption units, the rate of rise of restriction system electric current, if system is only the overload fault of short-term, again can open long-term through-flow branch road.The sequential opened is, first open full control devices switch unit, then half control devices switch unit is opened in triggering.
See Fig. 4, current overload is higher, exceedes the limit value of setting, or after after cutoff interruption units, system power is still increased beyond the limit value of setting, control strategy closes whole interruption units, thorough cutting system electric current.By the residual amount of energy of energy absorption branch road absorption system.
See Fig. 5, Fig. 6, electric current disjunction is propped up the multiple interruption units of route and is composed in series, and interruption units is made up of full bridge rectifier, unidirectional full control switching device, RCD absorbing circuit, lightning arrester.Full bridge rectifier realizes the two-way through-current capability of circuit breaker, and RCD absorbing circuit can effectively absorb the due to voltage spikes produced in turn off process, avoids interruption units overvoltage.Lightning arrester makes system can control different interruption units respectively, not only can cutting system electric current, and in the event of a system overload, can play metering function.At interruption units under chronic energy is impacted, lightning arrester is avoided entirely controlling switching device overvoltage, when each interruption units shutoff action of connecting is inconsistent, and the safe operation of the unidirectional full control switch of protection full control device.Device breakdown that voltage un-balance causes is dangerous effectively to avoid device directly to connect.
The electric pressure of the serial number real system of the interruption units of electric current disjunction branch road determines, according to real system requirement, can increase certain redundancy unit, strengthens the reliability of system stable operation.
Energy absorption is propped up route metal oxide arrester and is formed, and wherein according to energy grade during system short-circuit, can connect, be connected in parallel lightning arrester, effective absorption system short circuit energy.
See Fig. 7, direct current cutout system and higher level's master control system have communication mechanism, except the protection mechanism of self, DC circuit breaker by the control of MTDC transmission system, breaking current with again open circuit breaker, all by direct current system integrated scheduling.
See Fig. 7, the controller of DC circuit breaker, the electric current of long-term through-flow branch road of sampling, electric current disjunction branch road, energy absorption branch road, and according to the parameter of default, produce disjunction and open signal.Direct current system is protected.
The disjunction step of all solid state DC circuit breaker under system short-circuit fault pattern of the proposition of the present embodiment is:
(1) cutout controller sends electric current disjunction branch road interrupt flow unit triggers Continuity signal, On current disjunction branch road;
(2) cutout controller sends long-term through-flow branch road and entirely controls devices switch unit breaking signal, completes long-term through-flow branch road and is transformed into electric current disjunction branch road;
(3) cutout controller detects and judges that long-term through-flow branch current completes commutation course;
(4) cutout controller sends the breaking signal of electric current disjunction branch road, completes electric current breaking course;
(5) energy absorption branch road, in absorption system fault, the residual amount of energy of system.
The closed step that all solid state DC circuit breaker that the present embodiment proposes recovers when normally running is:
(1) what cutout controller sent electric current disjunction branch road interruption units opens signal, opens electric current disjunction branch road;
(2) cutout controller sends long-term through-flow branch road, and signal is opened in the triggering of full control devices switch unit;
(3) cutout controller sends long-term through-flow branch road, and signal is opened in the triggering of half control devices switch unit;
(4) cutout controller sends the breaking signal of electric current disjunction branch road interruption units.
The all solid state DC circuit breaker that the present invention proposes, topological structure is simply novel, and on-state loss is low, decreases the quantity of full control device, simplifies the complexity and cost that control.Meanwhile, interruption units adopts the modularized design of standard, can effectively reduce the technical requirement of directly connecting for device.This patent adopts all solid state scheme, and fault current removing speed is fast, and can utilize the control respectively of interruption units, the climbing of fault current limiting, makes circuit breaker have current-limiting function simultaneously simultaneously, the short circuit in effective process direct current system, overload fault.The safe operation of protection direct current system.
Those skilled in the art should understand, it is only preferred embodiment of the present invention above, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiments, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when the method and technology contents that can utilize above-mentioned announcement are made a little change or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, still belong in the scope of technical solution of the present invention.
Above to DC circuit breaker provided by the present invention, be described in detail, apply specific case herein and set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. an all solid state DC circuit breaker, is made up of long-term through-flow branch road, electric current disjunction branch road, energy absorption branch circuit parallel connection, it is characterized in that,
At least one half control devices switch unit of a described through-flow for a long time route and at least one full control devices switch units in series are formed, described half control devices switch unit is all connected with full bridge rectifier with full control devices switch unit, and long-term through-flow branch road adopts full bridge rectifier to realize the two-way flow of electric current;
Described electric current disjunction is propped up the multiple interruption units of route and is composed in series, described interruption units is composed in parallel by unidirectional full control switching device, absorbing circuit, lightning arrester, described parallel circuits is connected with full bridge rectifier, and electric current disjunction branch road adopts bridge rectifier to realize electric current two-way flow;
Described energy absorption branch road, comprises at least one lightning arrester unit, absorbs the system capacity in interrupting process.
2. all solid state DC circuit breaker according to claim 1, it is characterized in that, the full control devices switch unit of described long-term through-flow branch road, the unidirectional full control switching device of described electric current disjunction branch road, comprise IGBT, all wholly-controled device such as IGCT, IEGT.
3. all solid state DC circuit breaker according to claim 1, it is characterized in that, the absorbing circuit of described electric current disjunction branch road is the RCD absorbing circuit that resistance, electric capacity and diode are formed, described lightning arrester is the low voltage surge arrester matched with unidirectional full control switching device voltage, and the residual voltage of lightning arrester is chosen according to the safe operating conditions of device.
4. solid-state direct-current circuit breaker according to claim 1, is characterized in that, described energy absorption is propped up route lightning arrester unit and enough become, and determines series and parallel number and the connection in series-parallel syndeton of lightning arrester according to system parameters.
5. the control method of all solid state DC circuit breaker according to claim 1, it is characterized in that, concrete steps are as follows:
1) when system is normal, system power flows through full control devices switch unit and half control devices switch unit successively, and after detecting that system power exceedes current limit value, first system opens whole interruption units of electric current disjunction branch road; Then the full control devices switch unit in the long-term through-flow unit of turning off system, system power transfers to electric current disjunction branch road; Now, the automatic zero passage of half control devices switch cell current in long-term through-flow branch road, the half control device in half control devices switch unit recovers to bear high voltage capability, and long-term through-flow branch road completes commutation course;
2) after long-term through-flow branch road completes commutation course, electric current disjunction branch road, part or all of shutoff interruption units; According to the Current limited Control grade of system, when current overload is lower, part turns off interruption units, the rate of rise of restriction system electric current, if system is only the overload fault of short-term, then again opens long-term through-flow branch road; The sequential opened is: first open full control devices switch unit, then half control devices switch unit is opened in triggering;
3) when current overload is higher, system power exceedes the limit value of setting, or after after cutoff interruption units, system power is still increased beyond the limit value of setting, control strategy closes whole interruption units, thorough cutting system electric current, by the residual amount of energy of energy absorption branch road absorption system.
6. the control method of all solid state DC circuit breaker according to claim 5, is characterized in that, described all solid state DC circuit breaker, and closed step when System recover normally runs is:
1) what breaker controller sent electric current disjunction branch road interruption units opens signal, opens electric current disjunction branch road;
2) breaker controller sends long-term through-flow branch road, and signal is opened in the triggering of full control devices switch unit;
3) breaker controller sends long-term through-flow branch road, and signal is opened in the triggering of half control devices switch unit;
4) breaker controller sends the breaking signal of electric current disjunction branch road interruption units.
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Address after: 114051, Liaoning, Anshan MTR Eastern Science and technology road, No. 108 Applicant after: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. Applicant after: Shenzhen Power Supply Co.,Ltd. Address before: 114051 Anshan high tech Zone, Liaoning province science and technology road, No. 108 Applicant before: RONGXIN POWER ELECTRONIC Co.,Ltd. Applicant before: Shenzhen Power Supply Co.,Ltd. |
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Effective date of registration: 20180927 Address after: 114000 212 Yue Ling Road, Anshan, Liaoning Co-patentee after: Shenzhen Power Supply Co.,Ltd. Patentee after: RONGXIN HUIKO ELECTRIC TECHNOLOGY Co.,Ltd. Address before: 114051 Anshan City, Liaoning, the East District of science and Technology Road No. 108 Co-patentee before: Shenzhen Power Supply Co.,Ltd. Patentee before: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. |
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Address after: 114000 212 Yue Ling Road, Anshan, Liaoning Patentee after: Rongxin Huike Electric Co.,Ltd. Patentee after: Shenzhen Power Supply Co.,Ltd. Address before: 114000 212 Yue Ling Road, Anshan, Liaoning Patentee before: RONGXIN HUIKO ELECTRIC TECHNOLOGY Co.,Ltd. Patentee before: Shenzhen Power Supply Co.,Ltd. |