CN110011282A - A kind of direct-current short circuit Judgement of failure method and direct current system reclosing method - Google Patents
A kind of direct-current short circuit Judgement of failure method and direct current system reclosing method Download PDFInfo
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- CN110011282A CN110011282A CN201910068606.1A CN201910068606A CN110011282A CN 110011282 A CN110011282 A CN 110011282A CN 201910068606 A CN201910068606 A CN 201910068606A CN 110011282 A CN110011282 A CN 110011282A
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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
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
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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
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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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
- H02H7/268—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 for dc systems
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- Direct Current Feeding And Distribution (AREA)
Abstract
The present invention discloses a kind of direct-current short circuit Judgement of failure method and direct current system reclosing method, after including: dc circuit breaker separating brake, preset alternating-current detection signal is generated by the inverter of the DC output end of DC power transmission line, it is injected into DC power transmission line, the frequency of preset alternating-current detection signal is equal to the resonance frequency of the circuit after the DC power transmission line after the change of current branch access short trouble of dc circuit breaker；Detect the DC current response and DC voltage response of the dc circuit breaker output end of DC output end connection；The property of short trouble is judged according to DC current response and DC voltage response, when DC current response is greater than default first electric current criterion, and DC voltage response, when being greater than default first voltage criterion, short trouble is permanent fault, and otherwise short trouble is transient fault.The present invention differentiates short trouble property by active Injection Signal, to avoid breaker reclosing in permanent fault.
Description
Technical field
The invention belongs to flexible direct-current transmission fields, more particularly, to a kind of direct-current short circuit Judgement of failure method
And direct current system reclosing method.
Background technique
Flexible HVDC transmission system has many technical advantages, it can be achieved that extensive, high fluctuation renewable energy is put down
Slip into, it is possible to provide flexibly, efficiently power flowcontrol, be solve a wide range of power transmission, improve renewable energy utilization rate with
And the effective scheme for the problems such as promoting power supply reliability and system stability.In view of following extensive, long distance power transmission the need
It asks, overhead transmission line is inevitable choice.The reply frequent DC Line Fault of overhead transmission line is that building flexible direct current power grid is first
The technical problem to be solved.
Bridge-type modularization multi-level converter (MMC) based on bridge-type submodule can be by being latched insulated gate bipolar
The mode of transistor (Insulated Gate Bipolar Transistor, IGBT) blocks fault current, can also be by setting
Count controller active control direct fault current.The power device number as needed for bridge-type MMC is 2 times of semi-bridge type MMC, is increased
The cost and loss of inverter are added.Mixed type MMC is formed by bridge-type submodule and semi-bridge type sub-module cascade, can be to direct current
Electric current is controlled, the active fault current limiting during failure, is aided with low capacity dc circuit breaker isolated fault route, is become
Have both the selection of economy and technical advantage.
Flexible direct current power grid need to consider the cooperation of mixed type MMC and dc circuit breaker quickly to remove DC Line Fault so that
Sane system can run without interruption.It is similar with fault in ac transmission system protection, it also needs to consider high-speed reclosure scheme to realize failure
Fast recovery of power supply afterwards.Under normal conditions, after DC line fault occurs, breaker actuation is with disengagement failure electric current.Online
Can road be gone after dissociating, dc circuit breaker reclosing, by establish judgement of the DC voltage realization to nature of trouble.If can build
Vertical DC voltage, shows that failure has disappeared, and is transient fault, and system is restored to operate normally；If DC voltage can not be established,
It is then permanent fault, fault current steeply rises, and dc circuit breaker needs separating brake again.This method for restarting is in reclosing in forever
Secondary hazards can be caused when long property failure to system, and secondary separating brake further increases the Breaking capacity need of dc circuit breaker
It asks.For making somebody a mere figurehead soft lineal system based on mixed type MMC, still controllable DC voltage/current, has during DC Line Fault
The ability of active Injection Signal.On the other hand, the breakers such as bridge-type dc circuit breaker, mechanical dc circuit breaker topology is cascaded
In main branch after separating brake, change of current branch is still series among route, and the circulation for inverter Injection Signal provides path.
Therefore, adaptive reclosing control technology inject based on mixed type MMC active signal is studied, it is soft to be that raising is maked somebody a mere figurehead
The important channel of property DC grid operational reliability.
Summary of the invention
In view of the drawbacks of the prior art, it is an object of the invention to solve flexible direct current power grid reclosing in permanent fault
When system can be caused secondary hazards and need again separating brake the technical issues of.
To achieve the above object, in a first aspect, the present invention provides a kind of direct-current short circuit Judgement of failure method, this method
Applied to DC transmission system, DC transmission system includes the DC power transmission line between inverter, every DC power transmission line
Both ends respectively have a dc circuit breaker, the inverter is used to being converted to AC signal into direct current signal or turns direct current signal
It is changed to AC signal, carries out direct current transportation between two inverters, comprising the following steps:
The dc circuit breaker includes mechanical switch, energy-absorbing branch and change of current branch, when the DC power transmission line occurs
After short trouble, the mechanical switch of the dc circuit breaker is opened, and short circuit current flows through change of current branch, finally inhaled by energy-absorbing branch
It receives；
After the dc circuit breaker separating brake, preset friendship is generated by the inverter of the DC output end of DC power transmission line
Stream detection signal, is injected into DC power transmission line, the frequency of the preset alternating-current detection signal is according to the dc circuit breaker
The change of current branch access short trouble after DC power transmission line after circuit resonance frequency setting so that the default friendship
Stream detection signal can flow through the change of current branch of the dc circuit breaker；
The DC current response and DC voltage for detecting the dc circuit breaker output end of the DC output end connection are rung
It should be worth；
The type that the short trouble is judged according to the DC current response and DC voltage response, when described straight
Galvanic electricity stream response is greater than default first electric current criterion, and when the DC voltage response is greater than default first voltage criterion,
The short trouble is permanent fault, and otherwise the short trouble is transient fault, the first electric current criterion and first
Voltage criterion accesses short circuit according to the amplitude of the preset alternating-current detection signal and the change of current branch of the dc circuit breaker
The parameter setting of the circuit after DC power transmission line after failure.
Optionally, the short trouble is transient fault, is specifically included:
When DC current response is greater than the first electric current criterion, and DC voltage response is less than second voltage criterion, judgement
Failure is transient fault, or when DC current is responded less than the second electric current criterion, judges failure for transient fault；Second
Electric current criterion is less than first voltage criterion, the second electric current criterion and second less than the first electric current criterion, second voltage criterion
Voltage criterion accesses short circuit according to the amplitude of the preset alternating-current detection signal and the change of current branch of the dc circuit breaker
The parameter setting of the circuit after DC power transmission line after failure.
Optionally, the preset alternating-current detection signal is injected by the DC current controller of inverter, passes through change
The amplitude and frequency of the reference value signal of DC controller inject default alternating-current detection signal, the reference value of the DC controller
The frequency of the corresponding default alternating-current detection signal of signal frequency.
Optionally, the preset alternating-current detection signal is injected by the HVDC Modulation of inverter than signal, passes through change
HVDC Modulation injects default alternating-current detection signal than the amplitude and frequency of signal, and the HVDC Modulation is more corresponding than the frequency of signal pre-
If the frequency of alternating-current detection signal.
Optionally, when injecting default alternating-current detection signal, the amplitude of the reference value signal of the DC controller be 0pu~
0.1pu。
Optionally, when injecting default alternating-current detection signal, the HVDC Modulation is 1pu~1.1pu than the amplitude of signal.
Optionally, dc circuit breaker are as follows: coupled mode machinery dc circuit breaker, negative pressure coupled mode machinery dc circuit breaker or grade
Join full-bridge submodule type mixed type dc circuit breaker.
Optionally, inverter are as follows: submodule mixed type module multilevel converter, the bridge-type modular multilevel change of current
Device intersects cascade connection type modularization multi-level converter.
Second aspect, the present invention provide a kind of direct-current short circuit Judgement of failure method provided based on above-mentioned first aspect
Direct current system reclosing method, comprising:
When judging short trouble for permanent fault, control dc circuit breaker enters blocking, so that the direct current
The mechanical switch of breaker does not reclose, and waits direct current transmission line fault maintenance；
When judging short trouble for transient fault, control dc circuit breaker reclosing is closed the dc circuit breaker
Mechanical switch.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have below beneficial to effect
Fruit:
(1) the failure reclosing property judgment method based on inverter active control that the invention proposes a kind of is led to
It crosses and DC Line Fault property identification control model is added in Converter controller, occur that inverter and straight in DC Line Fault
After flowing breaker open operation, active signal is generated by switching control mode, is injected into faulty line, root through dc circuit breaker branch
Different responses are generated according to different faults property.
(2) the invention proposes a kind of nature of trouble to recognize criterion, straight according to permanent direct-current short circuit failure and instantaneity
Different equivalent circuit under flow short-circuit failure situations, by judging transient state line voltage distribution, electrical or breaker both ends electrical quantity
Size, Judging fault property avoid breaker reclosing in permanent fault, reduce flexible DC transmission network for direct current
The requirement of breaker Breaking capacity simplifies the design of breaker topology, improves flexible HVDC transmission system safety, reduces direct current
Engineering construction cost.
Detailed description of the invention
Fig. 1 is a kind of mixed type MMC topology used in the embodiment of the present invention；
Fig. 2 is a kind of control of the inverter of the default control of reference value containing DC current mode provided in an embodiment of the present invention
Logical schematic；
Fig. 3 is a kind of control logic containing HVDC Modulation than the inverter of default control mode provided in an embodiment of the present invention
Schematic diagram；
Fig. 4 is the structural schematic diagram of the dc circuit breaker of research of the embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of mechanical breaker provided in an embodiment of the present invention；
Fig. 6 is the circulation path that mechanical breaker provided in an embodiment of the present invention cut-offs rear Injection Signal；
Inverter, dc circuit breaker and overhead line during Fig. 7 is a kind of permanent fault provided in an embodiment of the present invention
The schematic equivalent circuit of composition；
Both ends inverter, dc circuit breaker and frame during Fig. 8 is a kind of transient fault provided in an embodiment of the present invention
The schematic equivalent circuit that ceases to be busy is constituted；
Fig. 9 is that a kind of direct current system based on direct-current short circuit Judgement of failure method provided in an embodiment of the present invention is overlapped
Lock method flow schematic diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
The specific technical solution that the present invention uses is as follows: after DC line goes to dissociate, passing through switching converter Control and produces
Raw active signal, is injected into faulty line through dc circuit breaker branch；According to Injection Signal in permanent direct-current short circuit failure and
Different response characteristics, differentiates short trouble property under instantaneity direct-current short circuit failure situations, to avoid breaker
Reclosing reduces requirement of the flexible DC transmission network for dc circuit breaker Breaking capacity, simplifies open circuit in permanent fault
The design of device topology improves flexible HVDC transmission system safety, reduces DC engineering construction cost.
Specifically, including a kind of voltage source converter reclosing Active Control Method, it is added in Converter controller
DC Line Fault property recognize control model, by nature of trouble recognize control instruction value in design with particular reference to amount, and by its
Control instruction value as DC current controller after DC Line Fault generation and dc circuit breaker separating brake.According to Injection Signal forever
Different response characteristics, sentences short trouble property under long property direct-current short circuit failure and instantaneity direct-current short circuit failure situations
Not.When being determined as permanent fault, it is latched dc circuit breaker, waits DC line fault maintenance；It is former when being determined as instantaneity
When barrier, then reclosing is normally carried out.
Preferably, DC current controller I can be used in nature of trouble identification controldcrefFor Injection Signal, pass through
Default IdcrefInstruction value, injected pulse or alternating signal are to faulty line.
Preferably, HVDC Modulation ratio M can be used in nature of trouble identification controldcFor Injection Signal, pass through default Mdc
Instruction value, injected pulse or alternating signal are to faulty line.
Specifically, DC current controller preset value can be pulsed quantity, alternating quantity etc., by injecting active signal, via
Dc circuit breaker is connected to the conducting of the branch in power grid, and different responses is generated according to permanent fault or transient fault.
Specifically, HVDC Modulation ratio MdcPreset value can be pulsed quantity, alternating quantity etc., by injecting active signal, via straight
Stream breaker is connected to the conducting of the branch in power grid, and different responses is generated according to permanent fault or transient fault.
Preferably, the amplitude of the Injection Signal should not be too large, and minimize the influence to system, and injected frequency should be with
Calculating determination can be carried out according to the resonance frequency of equivalent circuit by being set premised on breaker change of current branch.
Specifically, voltage source converter refers to that submodule has the modularization multi-level converter of output negative voltage ability,
The submodule has the modularization multi-level converter of output negative voltage ability including but not limited to submodule mixed type module
Change multilevel converter, bridge-type modularization multi-level converter, intersect cascade connection type modularization multi-level converter etc..
Specifically, direct-current breaker topology is mechanical including but not limited to coupled mode machinery dc circuit breaker, negative pressure coupled mode
Dc circuit breaker, cascade full-bridge submodule type mixed type dc circuit breaker etc..It is characterized in that, dc circuit breaker is in main branch point
After lock, still there is electrical connection with DC network by the inductance or capacitance apparatus of change of current branch.
Specifically, after nature of trouble anticipation criterion is by flowing into faulty line based on Injection Signal, in transient fault and
The difference that permanent fault generates is responded and is extracted.The signal circulation path of permanent fault and transient fault is different,
Equivalent circuit is entirely different, therefore the response generated also has different.Time domain or frequency-domain analysis are carried out to route transient, obtained
To the transient response difference of permanent fault and transient fault, to extract fault characteristic value, obtains permanent fault and distinguish
Know criterion.
Further, AC line voltage, DC line electric current, straight can be used in permanent, transient fault characteristic quantity
The response for flowing the signals such as breaker end voltage is criterion.
Further, to reduce the extraction difficulty of detection signal, while increasing the detection sensitivity of nature of trouble criterion,
It is main criterion that DC current response, which can be used, and the first electric current criterion I is arrangeddc_set1With the second electric current criterion Idc_set2, work as direct current
Stream response IdcGreater than the first electric current criterion Idc_set1When, then it can tentatively judge that failure for permanent fault, and carries out assistant criteria
It examines；When DC current responds IdcLess than the second electric current criterion Idc_set2When, then it can determine whether that failure is transient fault, the first electricity
Flow criterion Idc_set1Greater than the second electric current criterion Idc_set2。
It further, is the accuracy for improving nature of trouble identification, it is assistant criteria that DC voltage response, which can be used, if
Set first voltage criterion Udc_set1With second voltage criterion Udc_set2, when DC voltage responds UdcGreater than first voltage criterion
Udc_set1When, then it can determine whether that failure is permanent fault；When DC voltage responds UdcLess than second voltage criterion Udc_set2When, then
It can determine whether that failure is transient fault, first voltage criterion Udc_set1Greater than second voltage criterion Udc_set2。
As present invention further optimization, anticipation is out of order after property, provides a kind of dc circuit breaker reclosing logic.
When being determined as permanent fault, it is latched the pulse of dc circuit breaker main branch, waits DC line fault maintenance；When being determined as wink
When property failure, then reclosing command is issued to dc circuit breaker, carries out reclosing.
When the present invention is for aerial flexible direct current power grid generation permanent fault at present, what breaker reclosing may face
Secondary separating brake problem proposes a kind of flexible HVDC transmission system reclosing method based on the injection of inverter active signal.?
DC Line Fault occurs and after dc circuit breaker separating brake, generates active signal by converter Control, infuses through dc circuit breaker branch
Enter to faulty line；It is different under permanent direct-current short circuit failure and instantaneity direct-current short circuit failure situations according to Injection Signal
Response characteristic differentiates short trouble property, to avoid breaker reclosing in permanent fault, reduces flexible direct current
Requirement of the power transmission network for dc circuit breaker Breaking capacity simplifies the design of breaker topology, improves flexible DC transmission system
System safety, reduces DC engineering construction cost.
Fig. 1 is a kind of mixed type MMC topology used in the embodiment of the present invention.Each of which bridge arm is by half bridge-type submodule
Block FBSM and half semi-bridge type submodule HBSM are connected in series.For bridge-type submodule, operating mode is as shown in table 1,
It is characterized in that negative voltage can be exported, inverter can be made to run in negative pressure, wherein T1-T4 respectively indicates each bridge-type submodule
Four IGBT, UsmIndicate that the voltage of submodule output, Uc indicate capacitance voltage in submodule.Control system according to the present invention
For system suitable for each known, the MMC that can stablize output negative voltage is topological.
1 bridge-type submodule switch state of table
Fig. 2 is that a kind of DC Line Fault property proposed by the present invention recognizes control model, in the control of inverter DC current
Default control instruction value is added, designs one group of fault identification and controls reference quantity.After DC line goes to dissociate, startup separator property
Control model is recognized, by DC current controller reference value IdcrefThe switch contacts of input terminal switch to preset value, thus raw
It is injected into DC Line Fault route at active signal, carries out nature of trouble anticipation.The preset value uses alternating signal, in the present embodiment
Middle amplitude is chosen for 0~0.1pu (per unit value), and frequency is set premised on through breaker change of current branch, according to equivalent
The resonance frequency of circuit carries out calculating determination.
Fig. 3 is that another DC Line Fault property proposed by the present invention recognizes control model, in the DC control of controller
One group of HVDC Modulation is designed than default control instruction value, after DC line goes to dissociate, startup separator property recognizes control model,
By HVDC Modulation than signal MdcInput terminal switch to preset value, so that generating active signal is injected into DC Line Fault route, into
The anticipation of row nature of trouble.The preset value uses alternating signal, and amplitude is chosen for 1~1.1pu (per unit value) in the present embodiment, frequency
Rate is set premised on through breaker change of current branch, carries out calculating determination according to the resonance frequency of equivalent circuit.
Fig. 4 is the topological diagram of dc circuit breaker used in the embodiment of the present invention, and breaker is by main branch, change of current branch and suction
Energy branch composition, wherein main branch is the branch that dc circuit breaker is connected when operating normally.After DC Line Fault generation, main branch
Road separating brake, fault current flow through change of current branch and energy-absorbing branch.Change of current branch is since the devices such as inductance or capacitor exist, with direct current
Network still has electrical connection.
Fig. 5 is a kind of structural schematic diagram of mechanical breaker provided in an embodiment of the present invention.Mechanical breaker is by fast
Fast mechanical switch, change of current branch and energy-absorbing branch are constituted, and manufacturing cost and running wastage are relatively low.Fast mechanical switch exists
It is closed when normal operation, after DC Line Fault generation, mechanical switch quick acting switching-off, fault current flows through change of current branch and energy-absorbing branch
Road.
Fig. 6 is after dc circuit breaker disconnects, and converter station passes through breaker change of current branch (L, C) to fault point Injection Signal
Guiding path.Change of current branch still has electrical connection with DC network since the devices such as inductance or capacitor exist.What inverter issued
Injection Signal flows into faulty line by change of current branch.
The equivalent circuit that Fig. 7 is DC Line Fault when being permanent fault, inverter is equivalent to DC voltage source and injection is believed
The superposition of number generator, the change of current branch of breaker constitute LC access.Wherein, the inductance on the right side of dc circuit breaker access is limited
Flow reactor.By calculating the resonance frequency of equivalent circuit, suitable I is chosendcrefOr MdcInjection Signal, it is easy to can produce
The DC current response quautity of detection.
The equivalent circuit that Fig. 8 is DC Line Fault when being transient fault, after transient fault is removed, both ends inverter and straight
Stream transmission of electricity overhead line is connected by the dc circuit breaker change of current branch at both ends, constitutes complete loops.Injection Signal is in instantaneity event
It is serious to hinder decaying in equivalent circuit, DC current response quautity very little.
Fig. 9 is that a kind of direct current system based on direct-current short circuit Judgement of failure method provided in an embodiment of the present invention is overlapped
Lock method flow diagram, comprising the following steps:
(1) direct-current short circuit fault-signal, dc circuit breaker separating brake are detected.
(2) switch converter Control mode, to system Injection Signal.
(3) Injection Signal response characteristic amount is extracted, judges whether it meets permanent fault criterion, it is pre- to carry out nature of trouble
Sentence.
To reduce the extraction difficulty of detection signal, while increasing the detection sensitivity of nature of trouble criterion, the present invention uses
The DC current response generated after Injection Signal is main criterion, and the first electric current criterion I is arrangeddc_set1With the second electric current criterion
Idc_set2, when DC current responds IdcGreater than the first electric current criterion Idc_set1When, then can tentatively judge failure for permanent fault,
And carry out assistant criteria inspection；When DC current responds IdcLess than the second electric current criterion Idc_set2When, then it can determine whether that failure is wink
When property failure, Idc_set1Greater than Idc_set2。
For the accuracy for improving nature of trouble identification, the present invention is used supplemented by the DC voltage response generated after Injection Signal
Criterion is helped, first voltage criterion U is setdc_set1With second voltage criterion Udc_set2, when DC voltage responds UdcGreater than the first electricity
Press criterion Udc_set1When, then it can determine whether that failure is permanent fault；When DC voltage responds UdcLess than second voltage criterion
Udc_set2When, then it can determine whether that failure is transient fault, Udc_set1Greater than Udc_set2。
(4) reclosing action director, based on nature of trouble recognize criterion, when being determined as permanent fault, breaker into
Enter blocking, waits DC line fault maintenance；When being determined as transient fault, then by progress reclosing in the original plan.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (9)
1. a kind of direct-current short circuit Judgement of failure method, this method is applied to DC transmission system, and DC transmission system includes
There are a dc circuit breaker, the inverter in DC power transmission line between inverter, the both ends of every DC power transmission line
For AC signal to be converted to direct current signal or direct current signal is converted to AC signal, direct current is carried out between two inverters
Transmission of electricity, which comprises the following steps:
The dc circuit breaker includes mechanical switch, energy-absorbing branch and change of current branch, when short circuit occurs for the DC power transmission line
After failure, the mechanical switch of the dc circuit breaker is opened, and short circuit current flows through change of current branch, finally absorbed by energy-absorbing branch；
After the dc circuit breaker separating brake, preset exchange is generated by the inverter of the DC output end of DC power transmission line and is examined
Signal is surveyed, DC power transmission line, frequency the changing according to the dc circuit breaker of the preset alternating-current detection signal are injected into
The resonance frequency setting of the circuit after DC power transmission line after flowing branch access short trouble, so that the default exchange inspection
The change of current branch of the dc circuit breaker can be flowed through by surveying signal；
Detect the DC current response and DC voltage response of the dc circuit breaker output end of the DC output end connection；
The type that the short trouble is judged according to the DC current response and DC voltage response, when the direct current
It flows response and is greater than default first electric current criterion, and when the DC voltage response is greater than default first voltage criterion, it is described
Short trouble is permanent fault, and otherwise the short trouble is transient fault, the first electric current criterion and first voltage
Criterion accesses short trouble according to the amplitude of the preset alternating-current detection signal and the change of current branch of the dc circuit breaker
The parameter setting of the circuit after DC power transmission line afterwards.
2. direct-current short circuit Judgement of failure method according to claim 1, which is characterized in that the short trouble is wink
When property failure, specifically includes:
When DC current response is greater than the first electric current criterion, and DC voltage response is less than second voltage criterion, failure is judged
For transient fault, or when DC current is responded less than the second electric current criterion, judge failure for transient fault；Second electric current
Criterion is less than first voltage criterion, the second electric current criterion and second voltage less than the first electric current criterion, second voltage criterion
Criterion accesses short trouble according to the amplitude of the preset alternating-current detection signal and the change of current branch of the dc circuit breaker
The parameter setting of the circuit after DC power transmission line afterwards.
3. direct-current short circuit Judgement of failure method according to claim 1, which is characterized in that the preset exchange inspection
It surveys signal to inject by the DC current controller of inverter, the amplitude and frequency of the reference value signal by changing DC controller
Rate injects default alternating-current detection signal, the frequency of the corresponding default alternating-current detection signal of the reference value signal frequency of the DC controller
Rate.
4. direct-current short circuit Judgement of failure method according to claim 1, which is characterized in that the preset exchange inspection
Signal is surveyed to inject by the HVDC Modulation of inverter than signal, it is more pre- than amplitude and the frequency injection of signal by changing HVDC Modulation
If alternating-current detection signal, the frequency of the HVDC Modulation default alternating-current detection signal more corresponding than the frequency of signal.
5. direct-current short circuit Judgement of failure method according to claim 3, which is characterized in that the default exchange detection of injection
When signal, the amplitude of the reference value signal of the DC controller is 0pu~0.1pu.
6. direct-current short circuit Judgement of failure method according to claim 4, which is characterized in that the default exchange detection of injection
When signal, the HVDC Modulation is 1pu~1.1pu than the amplitude of signal.
7. direct-current short circuit Judgement of failure method according to claim 4, which is characterized in that the dc circuit breaker
Are as follows: coupled mode machinery dc circuit breaker, negative pressure coupled mode machinery dc circuit breaker or cascade full-bridge submodule type mixed type direct current
Breaker.
8. direct-current short circuit Judgement of failure method according to claim 4, which is characterized in that the inverter are as follows: son
Module mixed type module multilevel converter, bridge-type modularization multi-level converter intersect cascade connection type modular multilevel
Inverter.
9. a kind of direct current system based on the described in any item direct-current short circuit Judgement of failure methods of claim 1 to 8 is overlapped
Lock method characterized by comprising
When judging short trouble for permanent fault, control dc circuit breaker enters blocking, so that the direct current interruption
The mechanical switch of device does not reclose, and waits direct current transmission line fault maintenance；
When judging short trouble for transient fault, control dc circuit breaker reclosing is closed the machinery of the dc circuit breaker
Switch.
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| CN201910068606.1A CN110011282B (en) | 2019-01-24 | 2019-01-24 | Method for judging nature of direct-current short-circuit fault and reclosing method of direct-current system |
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| CN201910068606.1A CN110011282B (en) | 2019-01-24 | 2019-01-24 | Method for judging nature of direct-current short-circuit fault and reclosing method of direct-current system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN110739668A (en) * | 2019-10-24 | 2020-01-31 | 华中科技大学 | flexible direct-current power grid short-circuit fault property judging method and reclosing method |
| CN111142044A (en) * | 2020-02-05 | 2020-05-12 | 东南大学 | Direct current line fault secondary detection device with short-circuit fault energy absorption capacity |
| CN111224569A (en) * | 2020-02-20 | 2020-06-02 | 浙江大学 | Low full-bridge proportion submodule hybrid MMC and direct current fault processing strategy thereof |
| CN111817268A (en) * | 2020-06-17 | 2020-10-23 | 清华大学 | Fault processing method, fault processing device and direct current transmission system |
| CN113985184A (en) * | 2021-11-02 | 2022-01-28 | 国网北京市电力公司 | Test method, device and system for direct current distribution network protection device and storage medium |
| CN114301175A (en) * | 2021-12-28 | 2022-04-08 | 济南置真电气有限公司 | Power distribution station area user transformation relation identification method and device based on injection signals |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110456209A (en) * | 2019-08-16 | 2019-11-15 | 华中科技大学 | A kind of direct-current short circuit property judgment method and direct current system reclosing method |
| CN110718929A (en) * | 2019-09-02 | 2020-01-21 | 中国科学院电工研究所 | Current conversion module, energy storage power station structure, energy storage power station system and fault processing method |
| CN110739668B (en) * | 2019-10-24 | 2021-02-09 | 华中科技大学 | Flexible direct-current power grid short-circuit fault property judging method and reclosing method |
| CN110739668A (en) * | 2019-10-24 | 2020-01-31 | 华中科技大学 | flexible direct-current power grid short-circuit fault property judging method and reclosing method |
| CN111142044B (en) * | 2020-02-05 | 2022-03-18 | 东南大学 | Direct current line fault secondary detection device with short-circuit fault energy absorption capacity |
| CN111142044A (en) * | 2020-02-05 | 2020-05-12 | 东南大学 | Direct current line fault secondary detection device with short-circuit fault energy absorption capacity |
| CN111224569B (en) * | 2020-02-20 | 2021-01-26 | 浙江大学 | Low full-bridge proportion submodule hybrid MMC and direct current fault processing strategy thereof |
| CN111224569A (en) * | 2020-02-20 | 2020-06-02 | 浙江大学 | Low full-bridge proportion submodule hybrid MMC and direct current fault processing strategy thereof |
| CN111817268A (en) * | 2020-06-17 | 2020-10-23 | 清华大学 | Fault processing method, fault processing device and direct current transmission system |
| CN111817268B (en) * | 2020-06-17 | 2022-04-05 | 清华大学 | Fault processing method, fault processing device and direct current transmission system |
| CN113985184A (en) * | 2021-11-02 | 2022-01-28 | 国网北京市电力公司 | Test method, device and system for direct current distribution network protection device and storage medium |
| CN114301175A (en) * | 2021-12-28 | 2022-04-08 | 济南置真电气有限公司 | Power distribution station area user transformation relation identification method and device based on injection signals |
| CN115808646A (en) * | 2023-01-17 | 2023-03-17 | 国网山西省电力公司电力科学研究院 | Flexible direct current system line fault property identification method based on improved half-bridge type MMC |
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