CN108616110A - A kind of protective device of AC/DC interconnected system - Google Patents
A kind of protective device of AC/DC interconnected system Download PDFInfo
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- CN108616110A CN108616110A CN201611129613.0A CN201611129613A CN108616110A CN 108616110 A CN108616110 A CN 108616110A CN 201611129613 A CN201611129613 A CN 201611129613A CN 108616110 A CN108616110 A CN 108616110A
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- 230000001681 protective effect Effects 0.000 title claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims description 37
- 230000006855 networking Effects 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000013316 zoning Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a kind of protective device of AC/DC interconnected system, AC/DC interconnected system includes at least one substation's subsystem, and exchange input or direct current input can be switched at least direct current output and/or at least exchange output all the way all the way by substation's subsystem；Protective device includes system-level protection module and Unit Level protection module; system-level protection module includes harmonics unit and direct current protecting unit; wherein; harmonics unit is used to protect the ac input circuit and/or exchange output circuit of substation's subsystem; direct current protecting unit is used to protect the direct-flow input circuit and/or DC output circuit of substation's subsystem, Unit Level protection module to be used to protect the operating circuit of substation's subsystem.The integrated circuit and the element in circuit that the protection domain of the protective device covers AC/DC interconnected system, each area's protection domains at different levels are clear and cooperate, unprotect dead zone, while isolated fault region, it is ensured that no failure part continues to run with.
Description
Technical field
The present invention relates to power supply protection technical fields, and in particular to a kind of protective device of AC/DC interconnected system.
Background technology
In recent years, distributed generation resource, DC load largely access public electric wire net, and power of alterating and direct current and load be simultaneously in power grid
It deposits, the demand of alternating current-direct current hybrid power supply pattern is proposed to power grid.Meanwhile Development of Power Electronic Technology is swift and violent, in electric system
Middle large-scale application so that power grid is transformed into possibility from traditional Alternating Current Power Supply pattern to alternating current-direct current combined power supply way.It hands over
Direct current interacted system may be implemented power supply reliability classification, meet user's differentiation power demands.
However, the topological structure of AC/DC interconnected system is various, wiring is complicated so that relaying configuration and adjust it is also more multiple
It is miscellaneous.Different from the protection of individual conventional AC and direct current protecting, AC/DC interconnected system needs AC and DC protection cooperation, ensures
The safety of equipment and system, quickly isolates faulty circuit, ensures continuing to run with for no failure part, to improve the safety of power supply
And reliability.
Invention content
Therefore, the technical problem to be solved in the present invention is that the topological structure of AC/DC interconnected system is various, wiring is complicated,
Circuit protection requires high.
For this purpose, an embodiment of the present invention provides following technical solutions：
A kind of protective device of AC/DC interconnected system, AC/DC interconnected system include at least one substation's subsystem,
Substation's subsystem inputs for that will exchange input or direct current and switchs at least direct current output and/or at least exchange all the way defeated all the way
Go out, including：
System-level protection module, system-level protection module include harmonics unit and direct current protecting unit, wherein exchange
Protection location is used to protect the ac input circuit of substation's subsystem and/or exchange output circuit, direct current protecting unit to be used for
Protect the direct-flow input circuit and/or DC output circuit of substation's subsystem；With
Unit Level protection module, Unit Level protection module are used to protect the operating circuit of substation's subsystem.
Optionally, the direct current output of substation's subsystem connects DC load circuit, exchange output connects AC load circuit, is
Irrespective of size protection module further includes load protection unit, and load protection unit is for protecting DC load circuit and/or AC load
Circuit.
Optionally, the operating circuit of substation's subsystem includes that at least conversion circuit, conversion circuit are used for direct current all the way
Voltage is converted to alternating voltage or DC voltage is converted to the DC voltage of different voltages size or is converted to alternating voltage
DC voltage or the alternating voltage that alternating voltage is converted to different voltages size, wherein at least conversion circuit includes conversion all the way
Bridge circuit, wherein at least the conversion bridge circuit of conversion circuit includes change-over switch all the way, and Unit Level protection module includes submodule
Protection location, Bridge protection location and change-over switch protection location, wherein submodule protection location is for protecting conversion electricity
Road, Bridge protection location are used to protect the conversion bridge circuit in conversion circuit, change-over switch protection location to be converted for protecting
Change-over switch in bridge circuit.
Optionally, harmonics unit includes differential protection subelement, overcurrent protection subelement and electric voltage exception protection
Unit.
Optionally, direct current protecting unit includes low-voltage overcurrent protection subelement, overcurrent protection subelement, directional over-current protection
Subelement, line differential protection subelement, Voltage unbalance protection subelement, the extremely low voltage protection subelement of mono-/bis-, mono-/bis-
Pole overvoltage protection subelement.
Optionally, load protection unit includes differential protection subelement, overcurrent protection subelement, directional over-current protection list
Member, Voltage unbalance protection subelement, the extremely low voltage protection subelement of mono-/bis-, mono-/bis-pole overvoltage protection subelement and voltage
Abnormal protection subelement.
Optionally, Unit Level protection module includes differential protection subelement, overcurrent protection subelement and submodule capacitance electricity
Press protection location.
Optionally, the direct current output of substation's subsystem is connect with the DC bus of same voltage class, direct current protecting unit
Including DC bus differential protection subelement.
Optionally, the exchange output of substation's subsystem is connect with the ac bus of same voltage class, harmonics unit
Including ac bus differential protection subelement.
Optionally, the input terminal of substation's subsystem is connect with distributed generation resource, the input terminal of substation's subsystem with point
Networking protection location is equipped between cloth power supply, networking protection location includes that anti-isolated island protects subelement, low/overvoltage protection single
First, low/over frequency protection subelement, fault disconnection and reclosing subelement.
Optionally, the differential protection subelement in harmonics unit for faults and acts tripping so that event is isolated
The partial circuit of barrier；Overcurrent protection subelement and electric voltage exception protection subelement in harmonics unit are used in differential protection
When subelement is not operating normally, the action of delay preset time is to cut off the partial circuit or hair alarm signal of failure.
Optionally, for heavy current grounding system, the protection exit of harmonics unit trips with the part of isolated fault
The rest part of circuit, the AC/DC interconnected system can continue as load power supply；If single substation subsystem is individually for loading
When power supply, then direct current or exchange input have been needed.
Optionally, for small current neutral grounding system, when phase-to phase fault occurs, the protection exit of harmonics unit trips
With the partial circuit of isolated fault, the rest part of the AC/DC interconnected system can continue as load power supply；It is connect when generation is single-phase
When ground, if single substation subsystem independent operating, can continue to run with according to system requirements, subelement is protected by electric voltage exception
Send out alarm signal；If more than two substations subsystem interconnected operation, can continue to run with, and will be with failure according to system requirements
Interconnection switch between the substation's subsystem and other substation's subsystems of circuit connection disconnects.
Optionally, direct current protecting unit is used to cut off the partial circuit of failure, other fault-frees of AC/DC interconnected system
Partial circuit continues to run with；
Low-voltage overcurrent protection subelement in direct current protecting unit is used for as by the main protection of protection circuit；
Overcurrent protection subelement, Voltage unbalance protection subelement in direct current protecting unit, the extremely low voltage protection of mono-/bis-
Subelement, mono-/bis-pole overvoltage protection subelement are as by the back-up protection of protection circuit；
Line differential protection subelement, directional over-current protection subelement in direct current protecting unit are used for positioning failure.
Optionally, load protection unit is used to cut off the fault branch in DC load circuit or AC load circuit,
Remaining no failure part continues to run with.
Technical solution of the present invention has the following advantages that：
1. the protective device of AC/DC interconnected system provided in an embodiment of the present invention is interconnected alternating current-direct current using principle of grading
System carries out cascade protection according to system-level and Unit Level, and system-level protection module is divided into harmonics list using area principle
Member, direct current protecting unit, to protect the alternating current and DC circuit in AC/DC interconnected system respectively.Unit Level protection module
Mainly for the protection of the power electronics operating circuit in substation's subsystem.To which the protection domain of the protective device covers
The integrated circuit and the element in circuit of AC/DC interconnected system, each area's protection domains at different levels are clear and cooperate, no guarantor
Protect dead zone.In addition, the protected mode of the Grading And Zoning, can quickly positioning failure region quickly to cut off interlock circuit to protect
Demonstrate,prove the normal operation in fault-free region.The protective device can be adapted for the AC/DC interconnected system interconnected by any form.
2. the protective device of AC/DC interconnected system provided in an embodiment of the present invention, to the work of substation's subsystem in system
Make circuit and carry out layered protection according to progressive principle, first with submodule protection location to each conversion circuit therein
Protection on the whole is carried out, then the Partial key circuit in conversion circuit is protected using Bridge protection location, most
Change-over switch protection location is recycled to protect the key element in conversion circuit afterwards.To using multiple protective come most
Ensure the safety of the operating circuit in core circuit-substation's subsystem in AC/DC interconnected system and reliable in big degree
Property, to ensure the power supply reliability of entire interacted system and the electrical safety of user.In addition, the multilayer protected mode not only may be used
To ensure the safety of the wherein safety of Key Circuit and key element to the full extent, moreover it is possible to which timely substation subsystem distinguishes event
Hinder circuit and healthy circuit, to cut off the safe operation that faulty circuit ensures other healthy circuits in time.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is that the protection of AC/DC interconnected system in the embodiment of the present invention divides schematic diagram；
Fig. 2 is a kind of topology diagram for AC/DC interconnected system that the embodiment of the present invention can be applicable in；
Fig. 3 is that the protection of AC/DC interconnected system shown in Fig. 2 divides figure；
Fig. 4 is the protection schematic diagram that the embodiment of the present invention can be adapted for another AC/DC interconnected system.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
The every other embodiment that personnel are obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " connected " " connects
Connect " it shall be understood in a broad sense, for example, it may be being fixedly connected, it may be a detachable connection, or be integrally connected；It can be machine
Tool connects, and can also be electrical connection；It can be directly connected, can also can also be two indirectly connected through an intermediary
Connection inside element can be wirelessly connected, can also be wired connection.For the ordinary skill in the art,
The concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each other
It can be combined with each other at conflict.
Embodiment
As shown in Figure 1, present embodiments providing a kind of protective device of AC/DC interconnected system, AC/DC interconnected system packet
Include at least one substation's subsystem, exchange input or direct current input can be switched at least that direct current is defeated all the way by substation's subsystem
Go out and at least exchange output all the way, output AC voltage or can also only export DC voltage；Protective device includes system-level
Protection module and Unit Level protection module, system-level protection module include harmonics unit and direct current protecting unit, wherein are handed over
Stream protection location is used to protect the ac input circuit of substation's subsystem and/or exchange output circuit, direct current protecting unit to use
In the direct-flow input circuit and/or DC output circuit of protection substation subsystem, Unit Level protection module is for protecting power transformation
It stands the operating circuit of subsystem.
A kind of protective device of AC/DC interconnected system provided in this embodiment is mutually contacted alternating current-direct current using principle of grading
System carries out cascade protection according to system-level and Unit Level, and system-level protection module is divided into harmonics list using area principle
Member, direct current protecting unit refer mainly to alternating current circuit to protect the alternating current circuit and DC circuit in AC/DC interconnected system respectively
Part and DC line part.Unit Level protection module works electric mainly for the protection of the power electronics in substation's subsystem
Road.To the protection domain of, the protective device cover the integrated circuit of AC/DC interconnected system (including transmission line of electricity) and
Element in circuit, each area's protection domains at different levels are clear and cooperate, unprotect dead zone.In addition, the protection of the Grading And Zoning
Mode quickly can ensure the normal operation in fault-free region in positioning failure region quickly to cut off interlock circuit.The guarantor
Protection unit can be adapted for the AC/DC interconnected system interconnected by any form.
As other specific implementation modes, the operating circuit of above-mentioned substation's subsystem includes that at least conversion is electric all the way
Road, the conversion circuit is for being converted to alternating voltage by DC voltage or DC voltage being converted to the direct current of different voltages size
Alternating voltage is converted to DC voltage or alternating voltage is converted to the alternating voltage of different voltages size by voltage.Substation
The operating circuit of subsystem can also include the above conversion circuit in four tunnels or four tunnels, to realize that above-mentioned four kinds of voltage is converted respectively.
Wherein at least conversion circuit includes conversion bridge circuit all the way, and wherein at least the conversion bridge circuit of conversion circuit includes that conversion is opened all the way
It closes, Unit Level protection module includes submodule protection location, Bridge protection location and change-over switch protection location, wherein son
Module protection unit is used to protect conversion circuit, Bridge protection location to be used to protect the conversion bridge circuit in conversion circuit, turns
Switch protection unit is changed for protecting the change-over switch in conversion bridge circuit.Specifically, each protection in Unit Level protection module
Unit specifically includes at least one of differential protection subelement and overcurrent protection subelement, and Unit Level protection module can also wrap
Enclosed tool module capacitance voltage protection unit.
The protective device of AC/DC interconnected system provided in this embodiment, to the operating circuit of substation's subsystem in system
Layered protection is carried out according to progressive principle, each conversion circuit therein is carried out first with submodule protection location whole
Then protection on body is protected the Partial key circuit in conversion circuit using Bridge protection location, finally sharp again
The key element in conversion circuit is protected with change-over switch protection location.To using multiple protective come utmostly
The safety of the operating circuit in core circuit-substation's subsystem in upper guarantee AC/DC interconnected system and reliability, with
Ensure the power supply reliability of entire interacted system and the electrical safety of user.In addition, the multilayer protected mode not only can be most
Ensure the safety of the wherein safety of Key Circuit and key element in big degree, moreover it is possible to distinguish substation's subsystem work electricity in time
Faulty circuit in road and healthy circuit, to cut off the safe operation that faulty circuit ensures other healthy circuits in time.
Specifically, above-mentioned harmonics unit includes that differential protection subelement, overcurrent protection subelement and electric voltage exception are protected
Protect at least one of subelement.The harmonics unit can also include this three kinds protection subelements simultaneously, wherein with differential
Based on protection, when breaking down, by tripping come the partial circuit of isolated fault；Overcurrent protection and electric voltage exception protect conduct
Back-up protection, in main protection, i.e., when differential protection is not operating normally, delay certain time action is to cut off the circuit of faulty component
Or hair alarm signal.
For heavy current grounding system, the circuit of the protection exit tripping isolated fault part of harmonics unit is handed over straight
Stream interacted system rest part can continue as load power supply；If single substation subsystem is individually for load supplying, need
Direct current or exchange input.
For small current neutral grounding system, when phase-to phase fault occurs, protection exit and the high current of harmonics unit connect
Ground system is identical；It, can be according to system requirements after reforwarding if single substation subsystem independent operating when single-phase earthing occurs
Row, by electric voltage exception protection subelement send out alarm signal, can not trip disconnect faulty component circuit, until line selection apparatus or its
His measure lookup is out of order.If two or more substation's subsystem interconnected operations, can also continue to run with according to system requirements, with
This simultaneously can disconnect the interconnection switch of the substation's subsystem being connect with faulty circuit and other substation's subsystems.
Above-mentioned direct current protecting unit includes low-voltage overcurrent protection subelement, overcurrent protection subelement, directional over-current protection
Unit, line differential protection subelement, Voltage unbalance protection subelement, the extremely low voltage protection subelement of mono-/bis-, mono-/bis-pole
It is one or more in overvoltage protection subelement.Wherein, low-voltage overcurrent protection subelement is only protected as quickly protection
Circuit just acts when meeting low-voltage and overcurrent simultaneously.Low-voltage overcurrent protection subelement as by the main protection of protection circuit,
Overcurrent protection subelement, Voltage unbalance protection subelement, the extremely low voltage protection subelement of mono-/bis-, mono-/bis-pole overvoltage protection
Subelement is as by the back-up protection of protection circuit, and line differential protection subelement, directional over-current protection subelement are for positioning
Fault.When protection situation occurs above, cut off faulty component circuit or element, AC/DC interconnected system it is other without reason
Hinder partial circuit and continues normal operation.
As one of which specific embodiment, the direct current output of substation's subsystem can connect DC load circuit,
Exchange output can connect AC load circuit, and accordingly, system-level protection module further includes load protection unit, load protection list
DC load circuit and/or AC load circuit of the member for protecting substation's subsystem output end to connect.Load protection unit
Including differential protection subelement, overcurrent protection subelement, directional over-current protection subelement, Voltage unbalance protection subelement, it is single/
One kind or more in bipolar under-voltage protection subelement, mono-/bis-pole overvoltage protection subelement and electric voltage exception protection subelement
Kind.When above-mentioned error protection occurs in load protection circuit, the failure in DC load circuit or AC load circuit is only cut off
Branch, remaining no failure part continue to run with.
As specific embodiment, the direct current output of substation's subsystem can connect with the DC bus of same voltage class
It connects namely the ad eundem DC voltage of different substation subsystem output can be pooled on same DC bus, direct current protecting
Unit further includes DC bus differential protection subelement.
The exchange output of substation's subsystem can be connect with the ac bus of same voltage class namely different substation
The ad eundem alternating voltage of system output can be pooled on same ac bus, and harmonics unit further includes that ac bus is poor
Dynamic protection subelement.
In addition, the direct current output of substation's subsystem or exchange output can not also be connected on busbar.Different substation
The same voltage class output of subsystem can interconnect, and can also individually connect load, such as electric vehicle.
As another specific embodiment, the input terminal of substation's subsystem is connect with distributed generation resource, such as light
Distributed generation resource, wind-powered electricity generation distributed generation resource are lied prostrate, can also be other distributed generation resources, be not construed as limiting herein.Substation's subsystem
Be equipped with networking protection location between the input terminal and distributed generation resource of system, networking protection location include anti-isolated island protection subelement,
Low/overvoltage protection subelement, low/over frequency protection subelement and fault disconnection and reclosing subelement.In addition, distributed generation resource
Can be specifically to be connect with substation subsystem by transverter to realize, which can be DC/DC converters, should
DC/DC converters are converted to the DC voltage that distributed generation resource exports straight with the input voltage ad eundem of substation subsystem
It is connect with its direct-flow input end after galvanic electricity pressure.Above-mentioned transverter can also be DC/AC converters, which will be distributed
The DC voltage of formula power supply output, which is converted to, to be exchanged with after the alternating voltage of the input voltage ad eundem of substation subsystem with it
Input terminal connects.
A kind of protective device of AC/DC interconnected system provided in this embodiment can be adapted for shown in Fig. 2 hand over directly
Interacted system is flowed, which may be used the transformer of AC/DC/DC/AC forms, input AC AC,
Export the direct current DC of two-way different voltages grade, output exchanges AC all the way.The direct current DC of output can be connected on DC bus,
The DC bus connects the DC branches of multiple same voltage class.Specifically, DC bus 1-1 collects DC line 1-2, AC line
Road 1-1 and the DC circuits of substation's output；DC bus 2-1 collects DC line 1-3, DC line 1-1 and another power transformation
Stand output DC circuits.DC bus 1-2 collects the straight of DC load 1-1 circuits, DC load 1-2 circuits and substation's output
Flow Line 2-1；DC bus 2-2 collects the AC line of DC load 2-1 circuits, DC load 2-2 circuits and substation's output
Road 2-2.The exchange AC of output can be connected on ac bus, connect multiple AC loads, specifically：Low-voltage alternating-current circuit 1
It is connected on ac bus 1-1, connects AC load 1-1 and AC load 1-2, low-voltage alternating-current circuit 2 is connected to ac bus
On 2-1, AC load 2-1 and AC load 2-2 is connected.Above-mentioned AC/DC interconnected system substation can also use AC/DC/AC
The transformer of form, input AC AC, output all the way direct current DC with exchange AC all the way.
It is as shown in Figure 3 to the protection of above-mentioned AC/DC interconnected system using protective device provided in this embodiment.To exchange
Circuit 1, alternating current circuit 2, ac bus 1-1, ac bus 2-1, low-voltage alternating-current circuit 1 are exchanged with low-voltage alternating-current circuit 2
Protection, wherein harmonics include one or more of differential protection, overcurrent protection and electric voltage exception protection, but are not limited to this
Three kinds.In addition, further including ac bus differential protection, wherein low-voltage alternating-current to the protection of ac bus 1-1 and ac bus 2-1
Circuit 1 and low-voltage alternating-current circuit 2 can separately be protected with other alternating current circuits.
It is female to DC line 1-2, DC line 1-1, DC line 1-3, DC line 2-1, DC line 2-2, direct current
Line 1-1, DC bus 2-1, DC bus 1-2 and DC bus 2-2 carry out direct current protecting, wherein direct current protecting specifically include but
It is not limited to low-voltage overcurrent protection, overcurrent protection, directional over-current protection, line differential protection, Voltage unbalance protection, mono-/bis-pole
Under-voltage protection, mono-/bis-pole overvoltage protection, can also only select one such or several.Wherein, to DC bus 1-1,
The direct current protecting of DC bus 2-1, DC bus 1-2 and DC bus 2-2 further include DC bus differential protection.In addition, straight
Flow Line 2-1 and DC line 2-2 can separately be protected with other DC lines.
DC load protection is carried out to DC load 1-1, DC load 1-2, DC load 2-1 and DC load 2-2,
The protection of middle DC load include but not limited to overcurrent protection, directional over-current protection, line differential protection, Voltage unbalance protection,
The extremely low voltage protection of mono-/bis-, mono-/bis-pole overvoltage protection, can also only select one such or several.To AC load
1-1, AC load 1-2, AC load 2-1 and AC load 2-2 carry out AC load protection, and wherein AC load protection includes
But it is not limited to overcurrent protection, directional over-current protection and electric voltage exception protection, can also only be selected one such.
In addition, a kind of protective device of AC/DC interconnected system provided in this embodiment, can be applicable to shown in Fig. 4
AC/DC interconnected system, the AC/DC interconnected system and above-mentioned AC/DC interconnected system shown in Fig. 2 difference lies in：Its direct current
Circuit 1-3 is connected to distributed generation resource by DC/DC converters, to realize the networking of distributed generation resource.Correspondingly, dividing
Cloth power supply networking side is also provided with networking protection, specifically includes isolated island effect prevention protection, low/overvoltage protection, low/overfrequency guarantor
Shield, fault disconnection and reclosing.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (15)
1. a kind of protective device of AC/DC interconnected system, the AC/DC interconnected system includes at least one substation's subsystem
System, substation's subsystem will be for that will exchange input or direct current inputs and switchs at least direct current output and/or at least all the way all the way
Exchange output, which is characterized in that including：
System-level protection module, the system-level protection module include harmonics unit and direct current protecting unit, wherein described
Harmonics unit is used to protect the ac input circuit and/or exchange output circuit of substation's subsystem, the direct current
Protection location is used to protect the direct-flow input circuit and/or DC output circuit of substation's subsystem；With
Unit Level protection module, described device grade protection module are used to protect the operating circuit of substation's subsystem.
2. the protective device of AC/DC interconnected system according to claim 1, which is characterized in that substation's subsystem
Direct current output connect DC load circuit, exchange output connects AC load circuit, the system-level protection module further includes load
Protection location, the load protection unit is for protecting the DC load circuit and/or the AC load circuit.
3. the protective device of AC/DC interconnected system according to claim 1 or 2, which is characterized in that substation's
The operating circuit of system includes at least conversion circuit all the way, the conversion circuit be used for by DC voltage be converted to alternating voltage or
DC voltage is converted into the DC voltage of different voltages size or alternating voltage is converted into DC voltage or by alternating voltage
The alternating voltage of different voltages size is converted to, wherein at least the conversion circuit includes conversion bridge circuit all the way, wherein at least
The conversion bridge circuit of the conversion circuit includes change-over switch all the way, and described device grade protection module includes submodule block protection list
Member, Bridge protection location and change-over switch protection location, wherein the submodule protection location is for protecting the conversion electricity
Road, the Bridge protection location are used to protect the conversion bridge circuit in the conversion circuit, the change-over switch protection location
For protecting the change-over switch in the conversion bridge circuit.
4. the protective device of AC/DC interconnected system according to any one of claim 1-3, which is characterized in that the friendship
Stream protection location includes differential protection subelement, overcurrent protection subelement and electric voltage exception protection subelement.
5. the protective device of AC/DC interconnected system according to any one of claim 1-3, which is characterized in that described straight
Stream protection location includes low-voltage overcurrent protection subelement, overcurrent protection subelement, directional over-current protection subelement, Line Differential guarantor
It is single to protect subelement, Voltage unbalance protection subelement, the extremely low voltage protection subelement of mono-/bis-, mono-/bis-pole overvoltage protection
Member.
6. the protective device of AC/DC interconnected system according to claim 2, which is characterized in that the load protection unit
Including differential protection subelement, overcurrent protection subelement, directional over-current protection subelement, Voltage unbalance protection subelement, it is single/
Bipolar under-voltage protection subelement, mono-/bis-pole overvoltage protection subelement and electric voltage exception protect subelement.
7. the protective device of the AC/DC interconnected system according to any one of claim 1-6, which is characterized in that the dress
It includes differential protection subelement, overcurrent protection subelement and submodule capacitor voltage protection location to set a grade protection module.
8. the protective device of the AC/DC interconnected system according to any one of claim 1-7, which is characterized in that the change
The direct current output of power station subsystem is connect with the DC bus of same voltage class, and the direct current protecting unit includes that DC bus is poor
Dynamic protection subelement.
9. the protective device of the AC/DC interconnected system according to any one of claim 1-7, which is characterized in that the change
The exchange output of power station subsystem is connect with the ac bus of same voltage class, and the harmonics unit includes that ac bus is poor
Dynamic protection subelement.
10. the protective device of the AC/DC interconnected system according to any one of claim 1-8, which is characterized in that described
The input terminal of substation's subsystem is connect with distributed generation resource, input terminal and the distributed generation resource of substation's subsystem
Between be equipped with networking protection location, the networking protection location include anti-isolated island protect subelement, low/overvoltage protection subelement,
Low/over frequency protection subelement, fault disconnection and reclosing subelement.
11. the protective device of AC/DC interconnected system according to claim 4, which is characterized in that the harmonics list
The differential protection subelement in member for faults and acts tripping with the partial circuit of isolated fault；The exchange
The overcurrent protection subelement in protection location and electric voltage exception protection subelement be used for the differential protection subelement not
When regular event, the action of delay preset time is to cut off the partial circuit or hair alarm signal of failure.
12. the protective device of the AC/DC interconnected system according to claim 4 or claim 11, which is characterized in that right
It trips with the partial circuit of isolated fault, the alternating current-direct current in the protection exit of heavy current grounding system, the harmonics unit
The rest part of interacted system can continue as load power supply；If single substation subsystem is individually for load supplying, need
Direct current or exchange input.
13. the protective device of the AC/DC interconnected system according to claim 4 or claim 11, which is characterized in that right
In small current neutral grounding system, when phase-to phase fault occurs, the protection exit of the harmonics unit trips with isolated fault
The rest part of partial circuit, the AC/DC interconnected system can continue as load power supply；When single-phase earthing occurs, if single institute
Substation's subsystem independent operating is stated, then can be continued to run with according to system requirements, is accused by electric voltage exception protection subelement hair
Alert signal；If more than two substation's subsystem interconnected operations, can continue to run with, and will be with failure according to system requirements
Interconnection switch between the substation's subsystem and other substation's subsystems of circuit connection disconnects.
14. the protective device of AC/DC interconnected system according to claim 5, which is characterized in that the direct current protecting list
Partial circuit of the member for cutting off failure, the circuit of other no failure parts of the AC/DC interconnected system continue to run with；
The low-voltage overcurrent protection subelement in the direct current protecting unit is used for as by the main protection of protection circuit；
The overcurrent protection subelement, Voltage unbalance protection subelement in the direct current protecting unit, the mono-/bis-
Extremely low voltage protection subelement, the mono-/bis-pole overvoltage protection subelement are as by the back-up protection of protection circuit；
The line differential protection subelement, the directional over-current protection subelement in the direct current protecting unit is for positioning
Failure.
15. the protective device of the AC/DC interconnected system according to claim 2 or 6, which is characterized in that the load protection
Unit is used to cut off the fault branch in the DC load circuit or the AC load circuit, remaining no failure part continues
Operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611129613.0A CN108616110B (en) | 2016-12-09 | 2016-12-09 | Protection device of alternating current-direct current interconnection system |
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| CN201611129613.0A CN108616110B (en) | 2016-12-09 | 2016-12-09 | Protection device of alternating current-direct current interconnection system |
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| CN108616110B (en) | 2024-02-13 |
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