CN110165641A - The coincidence method of dc circuit breaker in flexible HVDC transmission system - Google Patents
The coincidence method of dc circuit breaker in flexible HVDC transmission system Download PDFInfo
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- CN110165641A CN110165641A CN201910549761.5A CN201910549761A CN110165641A CN 110165641 A CN110165641 A CN 110165641A CN 201910549761 A CN201910549761 A CN 201910549761A CN 110165641 A CN110165641 A CN 110165641A
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- Prior art keywords
- circuit breaker
- fault
- route
- transmission system
- hvdc transmission
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Classifications
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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
- H02H3/063—Details concerning the co-operation of many similar arrangements, e.g. in a network
-
- 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
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a kind of coincidence methods of dc circuit breaker in flexible HVDC transmission system, comprising: for failure of different nature in flexible HVDC transmission system, analysis dc circuit breaker coincides with fault characteristic when instantaneity and permanent fault；Based on the obtained fault characteristic of analysis, using the switching characteristic of dc circuit breaker transfer branch, using line fault go it is free after by conducting transfer branch and switch failure route both ends converter station control strategy by the way of realize the coincidence of dc circuit breaker.This method can reduce oscillation when it coincides with transient fault and the impact of secondary overcurrent when coinciding with permanent fault, to ensure that the safe and stable operation of system.
Description
Technical field
The present invention relates to flexible HVDC transmission system control and protection technical field more particularly to a kind of flexible DC transmissions
The coincidence method of dc circuit breaker in system.
Background technique
Flexible DC transmission is transmitted electricity compared to Traditional DC, it is advantageous that reactive compensation is not present, commutation failure etc. is asked
Topic, simultaneously because its electric current can be suitble to constitute MTDC transmission system with two-way flow.However in view of transmission distance, voltage etc.
Grade and thus bring cost problem, overhead line transmission of electricity is the major way of the extensive power transmission in following China, therefore grinds
Study carefully and has great importance using the error protection the relevant technologies of the flexible HVDC transmission system of overhead line.Overhead line application is brought
Main problem be that the probability of its transient fault greatly increases, therefore registration techniques using most important.
Research about the registration techniques of flexible HVDC transmission system both at home and abroad is broadly divided into two classes: one kind is based on novel
The registration techniques with failure self-cleaning ability inverter, it is another kind of, be the registration techniques based on dc circuit breaker.It compares
For the latter be not only able to quickly to cut off and isolated fault, and remain to realize certain power transmission during failure, guarantee system
The normal operation of system.Therefore the registration techniques based on dc circuit breaker are the hot spots of current technological development.It is existing to be based on direct current
The failure protection scheme of breaker be mostly on how to quickly cut off failure, and about be overlapped after failure the research of scheme compared with
It is few, it is therefore necessary to the coincidence method for studying dc circuit breaker in flexible HVDC transmission system, the difference occurred for route
The failure of property proposes improved Global Macros scheme.
Summary of the invention
The object of the present invention is to provide a kind of coincidence methods of dc circuit breaker in flexible HVDC transmission system, it is possible to reduce
Oscillation when it coincides with transient fault and secondary overcurrent impact when coinciding with permanent fault, to ensure that system
Safe and stable operation.
The purpose of the present invention is what is be achieved through the following technical solutions:
The coincidence method of dc circuit breaker in a kind of flexible HVDC transmission system, comprising:
For failure of different nature in flexible HVDC transmission system, analyzes dc circuit breaker and coincide with instantaneity and permanent
Fault characteristic when property failure；
Based on the fault characteristic that analysis obtains, using the switching characteristic of dc circuit breaker transfer branch, using line fault
It goes after dissociating to realize direct current interruption by way of conducting transfer branch and switch failure route both ends converter station control strategy
The coincidence of device.
As seen from the above technical solution provided by the invention, 1) this method realization is relied primarily in dc circuit breaker certainly
The transfer branch of body does not need additionally to increase equipment, is composed in series by a large amount of power electronic devices, has quickly switch
Characteristic；2) failure goes after dissociating to reduce the voltage difference at route both ends using the switching of converter station control strategy, to reduce
Dc circuit breaker coincides with generated oscillation when transient fault, and special using the high-speed switch of dc circuit breaker transfer branch
Property realizes the quick judgement for permanent fault, can disconnect faster dc circuit breaker compared to conventional method, thus
Reduce secondary overcurrent impact when coincidence.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the stream of the coincidence method of dc circuit breaker in a kind of flexible HVDC transmission system provided in an embodiment of the present invention
Cheng Tu；
Fig. 2 is the implementation flow chart of step 2 provided in an embodiment of the present invention；
Fig. 3 is both-end flexible HVDC transmission system topology schematic diagram provided in an embodiment of the present invention；
Fig. 4 proposes dc circuit breaker coincidence method and routine by present invention when transient fault provided in an embodiment of the present invention
Method contrast simulation schematic diagram；
Fig. 5 proposes dc circuit breaker coincidence method and routine by present invention when permanent fault provided in an embodiment of the present invention
Method contrast simulation schematic diagram.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to protection scope of the present invention.
The embodiment of the present invention provides a kind of coincidence method of dc circuit breaker in flexible HVDC transmission system, and feature exists
In, comprising:
Step 1 is directed to failure of different nature in flexible HVDC transmission system, and analysis dc circuit breaker coincides with instantaneity
With fault characteristic when permanent fault.
It is transmitted electricity in flexible HVDC transmission system using overhead line, and the application of overhead line leads to transient fault probability significantly
Increase.When dc circuit breaker coincides with transient fault, faulty line is equivalent to nonloaded line after dc circuit breaker separating brake,
Since control strategy is or not route both ends MMC (Modular Multilevel Converter, modularization multi-level converter)
Together, so that the DC voltage at route both ends is inconsistent after dc circuit breaker separating brake, therefore coincidence will cause electrical quantity in system
Oscillation.
For the flexible HVDC transmission system of both ends, one end is constant voltage station under normal circumstances, and the other end is to determine power
It stands, after dc circuit breaker coincides with transient fault, dc circuit breaker, which disconnects, is equivalent to keeping away in dc circuit breaker energy consumption branch
Thunder device has been connected in route, and line current is 0 always before dc circuit breaker is overlapped, since arrester absorbs both ends at this time
The power of MMC transmission is considered as constant power load processing, and expression formula is as follows:
P=Uiload=constant
Wherein, U is busbar voltage, iloadFor line current, constant indicates definite value；
So route is the equal of heavy service at this time, constant voltage control strategy have no idea voltage control is steady, therefore
The control strategy for only changing converter station is reduced there is no method to be vibrated；
When coinciding with permanent fault, failure goes to free rear fault point to still have, and dc circuit breaker carries out weight at this time
Closing operation, submodule capacitor can discharge again, and secondary overcurrent can be caused to impact to system.Due to needing to close again when conventional be overlapped
Close mechanical switch therefore if permanent fault its switch off time is longer again, and the fault current rate of climb after DC side failure
Quickly, it will lead to that fault curre is excessive again, therefore the safety and stability of system can be impacted.
Step 2, the fault characteristic obtained based on analysis, using the switching characteristic of dc circuit breaker transfer branch, using line
Road failure is gone straight to realize by way of conducting transfer branch and switch failure route both ends converter station control strategy after dissociating
Flow the coincidence of breaker.
The coincidence scheme of dc circuit breaker provided in an embodiment of the present invention, it is possible to reduce when it coincides with transient fault
Secondary overcurrent when vibrating and coinciding with permanent fault is impacted, to ensure that the safe and stable operation of system.
This step is realized on the basis of step 1 analyzes result, as shown in Fig. 2, its process includes:
(herein dynamic when route protection detects di/dt and du/dt (differential of electric current and voltage) meets operating criterion
Adjudicating can be set according to actual conditions), starting protection process；If line electricity flow valuve IdcMore than overcurrent protection setting value Ilim,
Fault current is removed in dc circuit breaker movement；After through after a period of time, the route of (for example, 250ms) goes free delay, conducting is straight
Flow breaker transfer branch, while switching determine power station control strategy so that it becomes constant voltage station and detection at this time electric current be
No overcurrent (i.e. Idc>Ilim)；
Such as non-overcurrent, then failure is determined for transient fault, arrester is bypassed rear two by the transfer branch be connected at this time
Side is all that voltage control surely can be reduced route voltage difference of the two ends by constant voltage station, finally turns off transfer branch again and is closed master
Branch mechanical switch completes coincidence process；
If direct overcurrent after conducting transfer branch, turns off change of current branch, using a period of time (for example, 250ms)
Route go second of conducting transfer branch after free delay to illustrate that failure is permanent fault if still overcurrent, close at this time
Disconnected transfer branch simultaneously keeps dc circuit breaker to disconnect always, carries out line maintenance by service personnel.
Above scheme of the present invention obtain it is following the utility model has the advantages that
1) this method realizes that the transfer branch relied primarily in dc circuit breaker itself does not need additionally to increase equipment, by
A large amount of power electronic devices is composed in series, and has quick switching characteristic.
2) failure goes after dissociating to reduce the voltage difference at route both ends using the switching of converter station control strategy, to reduce
Dc circuit breaker coincides with generated oscillation when transient fault, and utilizes the high-speed switch of dc circuit breaker transfer branch
Characteristic realizes the quick judgement for permanent fault, can disconnect dc circuit breaker faster compared to conventional method, from
And reduce the impact of secondary overcurrent when coincidence.
As shown in figure 3, being both-end flexible HVDC transmission system topology schematic diagram.DC line grade of rated voltage be ±
320kV, two sides AC system pass through modularization multi-level converter (the half bridge sub- based on half-bridge submodule
Module based module multilevel converter, HBSM-MMC) it is connected with DC line, MMC1 in this system
Using constant DC voltage control, MMC2 is hybrid dc circuit breaker, configuration using active power controller, each dc circuit breaker is determined
At the both ends of transmission line of electricity to quickly isolate failure.Failure is bipolar short trouble, is occurred in DC line midpoint, such as Fig. 3
Shown in middle F1.
It in order to illustrate the effect of above scheme of the present invention, is compared with conventional method, comparing result such as Fig. 4~Fig. 5
It is shown.In the two figures: (a1), (a2) be respectively using after conventional method line current, using the line after the method for the present invention
Road electric current；(b1), (b2) be respectively using after conventional method fault point voltage across poles, using the fault point after the method for the present invention
Voltage across poles；(c1), (c2) be respectively using after conventional method bus voltage across poles, using the bus pole after the method for the present invention
Between voltage.
The present invention proposes dc circuit breaker coincidence method when by route transient fault occurs for Fig. 4 and conventional method is compared and imitated
True schematic diagram.Conventional method line fault go it is free after dc circuit breaker be overlapped at this time due to there are voltage differences at route both ends therefore
It vibrates larger；And use coincidence method shown in the present invention conducting transfer branch and switch failure route after line fault goes free
Both ends converter station control strategy has bypassed the arrester plan of both sides converter station control simultaneously in energy consumption branch due to transfer branch
It has slightly all been constant voltage control strategy, therefore route voltage difference of the two ends is smaller, when coincidence, which is vibrated, significantly to be reduced.
The present invention proposes dc circuit breaker coincidence method when by route permanent fault occurs for Fig. 5 and conventional method is compared and imitated
True schematic diagram.Meeting when nature of trouble therefore dc circuit breaker coincidence cannot be quickly judged when conventional method is due to being permanent fault
It causes secondary overcurrent to impact system, threatens the safe and stable operation of system；And coincidence method shown in the present invention is used to work as direct current
Once carrying out if its transfer branch overcurrent of elder generation's fast conducting is just latched at once when breaker is overlapped twice if overcurrent is still deposited
Then it is being determined as permanent fault, there is high-speed switch characteristic since transfer branch routing power electronic devices is constituted, compare
It can be acted faster in conventional method, thus the secondary pulse for the fault current that can be subjected to when reducing coincidence.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment can
The mode of necessary general hardware platform can also be added to realize by software by software realization.Based on this understanding,
The technical solution of above-described embodiment can be embodied in the form of software products, which can store non-easy at one
In the property lost storage medium (can be CD-ROM, USB flash disk, mobile hard disk etc.), including some instructions are with so that a computer is set
Standby (can be personal computer, server or the network equipment etc.) executes method described in each embodiment of the present invention.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope of the present disclosure, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (3)
1. the coincidence method of dc circuit breaker in a kind of flexible HVDC transmission system characterized by comprising
For failure of different nature in flexible HVDC transmission system, analyzes dc circuit breaker and coincide with instantaneity and permanent event
Fault characteristic when barrier；
It goes to swim using line fault using the switching characteristic of dc circuit breaker transfer branch based on the fault characteristic that analysis obtains
Dc circuit breaker is realized by way of conducting transfer branch and switch failure route both ends converter station control strategies from rear
It is overlapped.
2. the coincidence method of dc circuit breaker, feature exist in a kind of flexible HVDC transmission system according to claim 1
In,
It is transmitted electricity in flexible HVDC transmission system using overhead line, when dc circuit breaker coincides with transient fault, direct current interruption
Faulty line is equivalent to nonloaded line, the difference of route both ends MMC control strategy, so that dc circuit breaker separating brake after device separating brake
The DC voltage at route both ends is inconsistent afterwards；For the flexible HVDC transmission system of both ends, it is assumed that one end is constant voltage station, separately
One end is to determine power station, and after dc circuit breaker coincides with transient fault, dc circuit breaker disconnection is equivalent to dc circuit breaker consumption
Arrester in energy branch has been connected in route, and line current is 0 always before dc circuit breaker is overlapped, and arrester absorbs
The power of both ends MMC transmission is considered as constant power load processing, and expression formula is as follows:
P=Uiload=constant
Wherein, U is busbar voltage, iloadFor line current, constant indicates definite value；
When coinciding with permanent fault, failure goes to free rear fault point to still have, and dc circuit breaker carries out coincidence behaviour at this time
Make, submodule capacitor can discharge again, and secondary overcurrent can be caused to impact to system.
3. the coincidence method of dc circuit breaker, feature in a kind of flexible HVDC transmission system according to claim 1 or 2
It is,
When route protection detects that the differential of electric current and voltage meets operating criterion, starting protection process；If line current
Value is more than overcurrent protection setting value, and fault current is removed in dc circuit breaker movement；Free delay is gone through route after a period of time
Afterwards, the transfer branch of conducting direct current breaker, while switching determines the control strategy at power station so that it becomes constant voltage station and detecting
At this time electric current whether overcurrent；
Such as non-overcurrent, then failure is determined for transient fault, arrester is bypassed rear both sides all by the transfer branch be connected at this time
It is that voltage control surely can be reduced route voltage difference of the two ends by constant voltage station, finally turns off transfer branch again and be closed main branch
Mechanical switch completes coincidence process；
If direct overcurrent after conducting transfer branch, turns off change of current branch, free delay is gone using the route of a period of time
Second of conducting transfer branch afterwards illustrates that failure is permanent fault, turns off transfer branch at this time and keep if still overcurrent
Dc circuit breaker disconnects always, carries out line maintenance by service personnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910549761.5A CN110165641B (en) | 2019-06-24 | 2019-06-24 | Superposition method of direct current circuit breaker in flexible direct current transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910549761.5A CN110165641B (en) | 2019-06-24 | 2019-06-24 | Superposition method of direct current circuit breaker in flexible direct current transmission system |
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| CN110165641A true CN110165641A (en) | 2019-08-23 |
| CN110165641B CN110165641B (en) | 2020-11-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111817267A (en) * | 2020-06-17 | 2020-10-23 | 清华大学 | Fault processing method and device and flexible direct current transmission system |
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