CN107271782A - Soft direct current current limiting reactor parameter determination method for overhead line - Google Patents
Soft direct current current limiting reactor parameter determination method for overhead line Download PDFInfo
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- CN107271782A CN107271782A CN201710620221.2A CN201710620221A CN107271782A CN 107271782 A CN107271782 A CN 107271782A CN 201710620221 A CN201710620221 A CN 201710620221A CN 107271782 A CN107271782 A CN 107271782A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The present invention relates to a kind of soft direct current current limiting reactor parameter determination method for overhead line, belong to high-voltage direct-current transmission system parameter type selecting field.Including：DC side occurs that system short-circuit electric current is divided into electric capacity electric discharge after short circuit and exchanges injection two parts, obtains the speed that fault current rises before protection starts after failure；The protection set according to protection system starts critical electric current value, protection startup time and protection response time and determines that protection starts the maximum of prior fault electric current；To prevent bridge arm from damaging, fault current maximum not should be greater than bridge arm and can bear current maxima, can obtain current-limiting reactor reactance value.The current-limiting reactor parameter obtained by the inventive method is with a high credibility；The inventive method can be used under any working condition.
Description
Technical field
It is more particularly to a kind of for the soft straight of overhead line the present invention relates to high-voltage direct-current transmission system parameter type selecting field
Current limiting reactor parameter determination method is flowed, the high-voltage large-capacity flexible direct current power transmission system direct current current limiting electricity for overhead line
The determination of anti-device parameter.
Background technology
Construction cost can be greatly reduced applied to overhead line in flexible direct current power transmission system and increases line transmission capacity, so
And frequently DC Line Fault can have a strong impact on the safety and reliability of transmission system.Due to higher voltage class, DC side
Generation intereelectrode short-circuit electric current increases rapidly, and equipment may be burnt out when serious and the stable operation of system is influenceed.Therefore it must take
Measure is by current control in safe range.
It is presently used for the high-voltage large-capacity flexible direct current power transmission system direct current current limiting reactor parameter determination of overhead line
Main method is to be obtained by field survey with experiment repeatedly, but still suffers from some following problem and await further solution, bag
Include：
1) influenceed by terms of measuring apparatus, operating personnel's qualification, measurement there may be not with experimental result
Believable situation is, it is necessary to further study the factor and its mechanism of action of influence result of the test, and screening confidence values are used.
2) influenceed by factors such as construction cost and construction periods, it is straight to obtain transverter by on-the-spot investigation completely
It is unpractiaca to flow current limiting reactor parameter.To save time and cost, it is necessary to theoretically calculate the reactance of current-limiting reactor
Value.
The content of the invention
It is an object of the invention to provide a kind of soft direct current current limiting reactor parameter determination method for overhead line,
Solve the above mentioned problem of prior art presence.Method of the present invention simply easily realizes that the current-limiting reactor parametric reliability of acquisition is high,
So that DC side post-fault system fault current is suppressed well, and the inventive method has applicability.
The above-mentioned purpose of the present invention is achieved through the following technical solutions：
For the soft direct current current limiting reactor parameter determination method of overhead line, comprise the following steps：
1), DC side occurs that system short-circuit electric current is divided into electric capacity electric discharge after short circuit and exchanges injection two parts, obtains event
The speed that fault current rises after barrier；
2) critical protective current value, guard delay time and the protection response time, set according to protection system determines
Protection starts the maximum of prior fault electric current；
3), to prevent bridge arm from damaging, fault current maximum can bear current maxima less than bridge arm, considers and builds
It is set as this and can obtain current-limiting reactor reactance parameter value.
Step 1) described in failure after fault current rise speed be calculated as follows：
Wherein, UdcFor DC voltage, UsPhase voltage is surveyed for exchange, L is bridge arm reactance, LdcFor current-limiting reactor, LσTo hand over
Flow side reactance.
Step 2) described in protection start prior fault electric current maximum calculated according to equation below：
Iarm_fault_max=Ipro+karm_fault(Tpro+Ts)
Wherein, IproProtection starts critical electric current value, TproFor protection startup time, TsFor protection response time.
Step 3) described in current-limiting reactor reactance parameter value calculated according to equation below：
The beneficial effects of the present invention are：By DC side occur short circuit after by system short-circuit electric current be divided into electric capacity electric discharge and
Exchange injection two parts, obtain the speed that fault current rises before protection starts after failure；The guarantor set according to protection system
Shield starts critical electric current value, protection startup time and protection response time and determines that protection starts the maximum of prior fault electric current
Value；To prevent bridge arm from damaging, fault current maximum not should be greater than bridge arm and can bear current maxima, obtain current-limiting reactor
Reactance value.Following advantageous effects can be reached：
(1) without installing big bridge arm reactance in transverter, without changing systematic parameter, it is ensured that the original property of transverter
Energy；
(2) size of DC side interpolar fault current is reduced, it is ensured that the safety and stability of system.
(3) device parameter is obtained by mathematical computations, in the absence of field survey caused by accuracy of instrument and human error
Parameter is inaccurate.
(4) set parameter can be changed according to requirement of engineering, the choosing of current-limiting reactor is carried out according to circuit service requirement
Select.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright illustrative example and its illustrate to be used to explain the present invention, do not constitute inappropriate limitation of the present invention.
Fig. 1 is flow chart of the invention；
Fig. 2 is the direct current side pole of embodiments of the invention to pole fault current equivalent circuit diagram.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, this is further illustrated below in conjunction with the accompanying drawings
The detailed content and its embodiment of invention.Here, the exemplary embodiment of the present invention and its illustrating to be used to explain this
Invention, but it is not as a limitation of the invention.
Referring to shown in Fig. 1 and Fig. 2, the soft direct current current limiting reactor parameter determination side for overhead line of the invention
Method, comprises the following steps：
1), DC side occurs that system short-circuit electric current is divided into electric capacity electric discharge after short circuit and exchanges injection two parts, obtains event
The speed that fault current rises after barrier；
2) critical protective current value, guard delay time and the protection response time, set according to protection system determines
Protection starts the maximum of prior fault electric current；
3), to prevent bridge arm from damaging, fault current maximum not should be greater than bridge arm and can bear current maxima, and synthesis is examined
Consider construction cost and can obtain current-limiting reactor reactance parameter value.
Step 1) described in failure after fault current rise speed be calculated as follows：
Wherein, UdcFor DC voltage, UsPhase voltage is surveyed for exchange, L is bridge arm reactance, LdcFor current-limiting reactor, LσTo hand over
Flow side reactance.
Step 2) described in protection start prior fault electric current maximum calculated according to equation below：
Iarm_fault_max=Ipro+karm_fault(Tpro+Ts)
Wherein, IproProtection starts critical electric current value, TproFor protection startup time, TsFor protection response time.
Step 3) described in fault current maximum not should be greater than bridge arm and can bear current maxima, even two parameter phase
Deng the current-limiting reactor span is calculated according to equation below：
Embodiment：
It is currently used for the high-voltage large-capacity flexible direct current power transmission system direct current current limiting reactor parameter determination of overhead line
The method of main method mainly using field survey with testing, but by terms of measuring apparatus, operating personnel's qualification
Influence, measurement with experimental result there may be incredible situation, it is necessary to further research influence result of the test factor
And its mechanism of action, screen confidence values and be used.In view of factors such as construction cost and construction periods, completely by the spot
Investigate to obtain Converter DC-side current-limiting reactor parameter be unpractiaca.To save time and cost, it is necessary to theoretically count
Calculate the reactance value of current-limiting reactor.If a kind of method by theoretical calculation can be proposed, current-limiting reactor is accurately obtained
Parameter, then can solve the problem that the problem of above-mentioned prior art is present.Based on this, the present invention proposes a kind of direct current current limiting reactor ginseng
Several determination methods.
It is shown in Figure 1, it is that the present invention is used for the high-voltage large-capacity flexible direct current power transmission system direct current current limiting of overhead line
Reactor determination method for parameter flow chart；This method includes：
Step 101：DC side occurs that system short-circuit electric current is divided into electric capacity electric discharge after short circuit and exchanges feed-in two parts, obtains
The speed that fault current rises before protection starts after to failure；
Step 102：Critical protective current value, guard delay time and the protection response time set according to protection system
It is determined that protection starts the maximum of prior fault electric current；
Step 103：Fault current maximum should be less than can bear current maxima equal to bridge arm, considers and builds into
Originally it can obtain current-limiting reactor reactance parameter value.
When it is implemented, step 101 can take following method to carry out, DC side occurs after short circuit, system short-circuit electric current
It is divided into electric capacity electric discharge and exchanges feed-in two parts, loop equivalent circuit diagram where obtaining two parts electric current, according to gill Hough electricity
Pressure law obtains the speed that fault current rises before protection startup after failure；
Wherein, UdcFor DC voltage, UsPhase voltage is surveyed for exchange, L is bridge arm reactance, LdcFor current-limiting reactor, LσTo hand over
Flow side reactance.
When it is implemented, in step 102, electric current is constantly in propradation before protection starts, set according to protection system
Critical protective current value, the guard delay time and protection the response time determine protection start prior fault electric current maximum；
Iarm_fault_max=Ipro+karm_fault(Tpro+Ts)
Wherein, IproProtection starts critical electric current value, TproFor protection startup time, TsFor protection response time.
When it is implemented, in step 103, to prevent bridge arm from damaging, fault current maximum not should be greater than bridge arm institute energy
Bear current maxima；Simultaneously, it is considered to construction cost, current-limiting reactor should be as small as possible, obtains current-limiting reactor reactance parameter
Value；
In summary, the high-voltage large-capacity flexible direct current power transmission system direct current for overhead line that the embodiment of the present invention is proposed
The main method that current limiting reactor parameter is determined, without installing big bridge arm reactance in transverter, without changing systematic parameter,
It ensure that the original performance of transverter；Reduce the size of DC side interpolar fault current, it is ensured that the security of system and steady
It is qualitative；Device parameter is obtained by mathematical computations, in the absence of parameter of the field survey caused by accuracy of instrument and human error not
Accurately；Set parameter can be changed according to requirement of engineering, the selection of current-limiting reactor is carried out according to circuit service requirement.
Obviously, those skilled in the art should be understood that each module or each step of the above-mentioned embodiment of the present invention can be with
Realized with general computing device, they can be concentrated on single computing device, or be distributed in multiple computing devices
On the network constituted, alternatively, the program code that they can be can perform with computing device be realized, so as to by they
Storage is performed by computing device in the storage device, and in some cases, can be with different from order execution herein
They, are either fabricated to each integrated circuit modules or by multiple moulds in them by shown or described step respectively
Block or step are fabricated to single integrated circuit module to realize.So, the embodiment of the present invention is not restricted to any specific hardware
Combined with software.
The preferred embodiment of the present invention is the foregoing is only, is not intended to limit the invention, for the technology of this area
For personnel, the present invention can have various modifications and variations.All any modification, equivalent substitution and improvements made for the present invention etc.,
It should be included in the scope of the protection.
Claims (4)
1. a kind of soft direct current current limiting reactor parameter determination method for overhead line, it is characterised in that：Including following step
Suddenly：
1), DC side occurs that system short-circuit electric current is divided into electric capacity electric discharge after short circuit and exchanges injection two parts, obtains after failure
The speed that fault current rises；
2) critical protective current value, guard delay time and the protection response time, set according to protection system determines protection
Start the maximum of prior fault electric current；
3), to prevent bridge arm from damaging, fault current maximum can bear current maxima less than bridge arm, considers and builds into
Originally it can obtain current-limiting reactor reactance parameter value.
2. the soft direct current current limiting reactor parameter determination method according to claim 1 for overhead line, its feature
It is：Step 1) described in failure after fault current rise speed be calculated as follows：
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Wherein, UdcFor DC voltage, UsPhase voltage is surveyed for exchange, L is bridge arm reactance, LdcFor current-limiting reactor, LσFor AC
Reactance.
3. the soft direct current current limiting reactor parameter determination method according to claim 1 for overhead line, its feature
It is：Step 2) described in protection start prior fault electric current maximum calculated according to equation below：
Iarm_fault_max=Ipro+karm_fault(Tpro+Ts)
Wherein, IproProtection starts critical electric current value, TproFor protection startup time, TsFor protection response time.
4. the soft direct current current limiting reactor parameter determination method according to claim 1 for overhead line, its feature
It is：Step 3) described in current-limiting reactor reactance parameter value calculated according to equation below：
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1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710620221.2A CN107271782A (en) | 2017-07-26 | 2017-07-26 | Soft direct current current limiting reactor parameter determination method for overhead line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107817415A (en) * | 2017-11-10 | 2018-03-20 | 全球能源互联网研究院有限公司 | A kind of bipolar short trouble variable characteristics analysis method of converter and system |
| CN110212505A (en) * | 2019-05-28 | 2019-09-06 | 清华大学 | The flexible HVDC transmission system current-limiting reactor choosing method of based superconductive current limiter |
| CN110580366A (en) * | 2018-06-11 | 2019-12-17 | 全球能源互联网研究院有限公司 | Method and device for optimizing electrical parameters of current-limiting reactor of direct-current power grid |
-
2017
- 2017-07-26 CN CN201710620221.2A patent/CN107271782A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107817415A (en) * | 2017-11-10 | 2018-03-20 | 全球能源互联网研究院有限公司 | A kind of bipolar short trouble variable characteristics analysis method of converter and system |
| CN110580366A (en) * | 2018-06-11 | 2019-12-17 | 全球能源互联网研究院有限公司 | Method and device for optimizing electrical parameters of current-limiting reactor of direct-current power grid |
| CN110212505A (en) * | 2019-05-28 | 2019-09-06 | 清华大学 | The flexible HVDC transmission system current-limiting reactor choosing method of based superconductive current limiter |
| CN110212505B (en) * | 2019-05-28 | 2020-07-10 | 清华大学 | Method for selecting current-limiting reactance of flexible direct-current transmission system based on superconducting current limiter |
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Application publication date: 20171020 |