CN106451520B - A kind of HVDC Modulation signal monitoring circuit selecting method - Google Patents
A kind of HVDC Modulation signal monitoring circuit selecting method Download PDFInfo
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- CN106451520B CN106451520B CN201610958500.5A CN201610958500A CN106451520B CN 106451520 B CN106451520 B CN 106451520B CN 201610958500 A CN201610958500 A CN 201610958500A CN 106451520 B CN106451520 B CN 106451520B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000007257 malfunction Effects 0.000 claims description 3
- 238000010606 normalization Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 2
- 241000282344 Mellivora capensis Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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- 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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Abstract
The present invention relates to a kind of HVDC Modulation signal monitoring circuit selecting methods.It assesses the probability of several line failures according to the actual situation first, assigns weighted value based on this for each route；Then disturbance is arranged one by one to all pre-selection HVDC Modulation signal monitoring routes, and before solving All other routes powermSecondary pendulum disturbance energy and, and do normalized respectively；The alternating current circuit influence index based on line fault probability is defined, the maximum route of this index is finally selected to monitor route as direct current tune signal system.The method of the present invention has not only quantified the degree that influences each other between each alternating current circuit, it is also contemplated that the influence of the fault rate of each route, the selection for HVDC Modulation signal monitoring route provide good foundation.
Description
Technical field
The invention belongs to HVDC Modulation fields, and in particular to a kind of consideration alternating current circuit probability of malfunction and interactional straight
It flows modulated signal and monitors circuit selecting method.
Background technique
The stability of connected AC system can be improved in DC power modulation technology in D.C. high voltage transmission.Direct current function
Rate modulation (DC power modulation, DCM) is that additional direct current modulator is added in direct current centralized control system, is handed over from both ends
The signal of reflection system exception is extracted in streaming system to adjust the transimission power of direct current, is allowed to quickly to absorb or compensate it and even be handed over
The power surplus or vacancy of streaming system, play Emergency Assistance and damped oscillation.
How the existing lot of documents research in the country improves the stabilization of system operation using the quick control characteristic of direct current system
Property.Small signal DC power modulation can effectively inhibit the oscillation of power under small interference, improve system dynamic stability；In large disturbances
In the case of, it its dc power for injecting AC system can rationally be made up with fast modulation using the short-time overload capacity of direct current
The amount of unbalance of power in transient process, to improve Transient angle stability.
The input signal selection of DC power modulation has apparent influence to modulation effect.Choose the input letter of different location
Number, system sensitive degree is different, thus leads to different modulation effects.
Summary of the invention
It is in view of near DC alternating current circuit probability of malfunction and interactional straight that the purpose of the present invention is to provide a kind of
It flows modulated signal and monitors route choosing method, this method has not only quantified the degree that influences each other between each alternating current circuit, also
Consider the influence of the fault rate of each route, for HVDC Modulation signal monitoring route selection provide it is good
Foundation.
To achieve the above object, the technical scheme is that a kind of HVDC Modulation signal monitoring circuit selecting method, packet
Include following steps,
S1: as monitoring route, assessment is preliminary according to the actual situation chooses alternating current circuit failure for preliminary alternating current circuit of choosing
Probability of happening, and weighted value is assigned based on this for each alternating current circuit；
S2: being respectively set disturbance to preliminary alternating current circuit of choosing, and thus solves m pendulum disturbance energy before each alternating current circuit power
Amount, and normalized is done respectively；
S3: defining the alternating current circuit influence index based on line fault probability, i.e., by weighted value and disturbing after normalization
Kinetic energy magnitude is accordingly calculated, and selects influence index maximum alternating current circuit in alternating current circuit as HVDC Modulation signal monitoring line
Road.
In an embodiment of the present invention, the alternating current circuit influence index based on line fault probability is specifically defined mode
It is as follows,
Due to alternating current circuitiFault disturbance lead to alternating current circuitjPower disturbance gross energyIt is defined as
Influence of the every route to itself is set as 0 i.e., and it is rightIt is normalized, obtains pair respectively
It answersFor
In conjunction with the weighted value of each alternating current circuit, the alternating current circuit influence index based on line fault probability is defined, i.e.,
In view of other alternating current circuit probabilities of malfunctionWhen, to alternating current circuitjIt can be expressed as
。
In an embodiment of the present invention, in the step S3, influence index maximum alternating current circuit in alternating current circuit is selected to make
Concrete mode for HVDC Modulation signal monitoring route is as follows,
CompareThe size of value, it is assumed that whenj=lWhen,Maximum is,
ShowlAlternating current circuit is maximum by the combined influence of other alternating current circuits, that is, selects it as HVDC Modulation signal monitoring
Route.
Compared to the prior art, the invention has the following advantages:
(1) method of the invention considers interacting between each alternating current circuit, to where understand near DC
Combined influence relative maximum of the alternating current circuit by other alternating current circuits, and route, energy are monitored using this route as direct current
Enough fault conditions for preferably reacting other each alternating current circuit or disturbance situation, in order to which direct current system can more rapidly
Make correct reaction；
(2) method of the invention considers each alternating current circuit and breaks down the probability of disturbance, in practical power systems
Because environment etc. influences, the probability that each alternating current circuit is broken down is different, and this method assesses each item according to the actual situation
The fault rate of route, and be reacted in the weight of imparting, to affect final HVDC Modulation detection signal
It chooses；
(3) the considerations of the method for the present invention proposes is had originality by other alternating current circuit influence indexs to disturbance probability,
This quantification of targets influence degrees of other alternating current circuits to certain alternating current circuit, it is also contemplated that the failure of each route and
Probability of happening is disturbed, has reacted the situation that interacts between each alternating current circuit well, is HVDC Modulation signal monitoring line
The selection on road provides foundation.
Detailed description of the invention
Fig. 1 is to apply power swing situation map after disturbance.
Fig. 2 is certain direct current system rectification side alternating current circuit structure chart.
Fig. 3 is the generator rotor angle rocking curve figure of power plant H when modulated signal is derived from different monitoring routes.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is specifically described.
A kind of HVDC Modulation signal monitoring circuit selecting method of the invention, includes the following steps,
S1: as monitoring route, assessment is preliminary according to the actual situation chooses alternating current circuit failure for preliminary alternating current circuit of choosing
Probability of happening, and weighted value is assigned based on this for each alternating current circuit；
S2: being respectively set disturbance to preliminary alternating current circuit of choosing, and thus solves m pendulum disturbance energy before each alternating current circuit power
Amount, and normalized is done respectively；
S3: defining the alternating current circuit influence index based on line fault probability, i.e., by weighted value and disturbing after normalization
Kinetic energy magnitude is accordingly calculated, and selects influence index maximum alternating current circuit in alternating current circuit as HVDC Modulation signal monitoring line
Road.
Further, it is as follows to be specifically defined mode for the alternating current circuit influence index based on line fault probability,
Due to alternating current circuitiFault disturbance lead to alternating current circuitjPower disturbance gross energyIt is defined as
Influence of the every route to itself is set as 0 i.e., and it is rightIt is normalized, obtains pair respectively
It answersFor
In conjunction with the weighted value of each alternating current circuit, the alternating current circuit influence index based on line fault probability is defined, i.e.,
In view of other alternating current circuit probabilities of malfunctionWhen, to alternating current circuitjIt can be expressed as
。
Further, in the step S3, select influence index maximum alternating current circuit in alternating current circuit as HVDC Modulation
The concrete mode of signal monitoring route is as follows,
CompareThe size of value, it is assumed that whenj=lWhen,Maximum is,
ShowlAlternating current circuit is maximum by the combined influence of other alternating current circuits, that is, selects it as HVDC Modulation signal monitoring
Route.
The following are specific implementation process of the invention.
By the alternating current circuit near converter stationL 1,L 2,L 3…L n Monitoring route is chosen as preliminary, first according to practical feelings
Condition is to routeL 1,L 2,L 3…L n The probability that breaks down is assessed, and the probability of corresponding each alternating current circuit is respectivelyg 1、g 2、g 3…g n ,
Then have, then correspondingnThe weight of route is settable as shown in table 1.
Whereinf i = pg i (i=1,2,…n；p> 0)
With routeL 1For, exist firstL 1Upper setting microvariations, corresponding linejPower swing situation is as shown in Figure 1
In Fig. 1t 0It represents disturbance and point occurs, disturb and just occur, power swing most serious gradually tends to as the time increases
Stablize, whereint 1、t 2、t 3..., t m Indicate power swing and stationary valueP 0BeforemA intersection point, thenS 1j(1)、S 1j(2)、S 1j(3)
…S 1j(m)Indicate that route 1 disturbs caused routejBefore power swingmThe secondary disturbance energy swung up and down, when practical operation according to
It disturbs severity and the selection of each line oscillation situation is suitablemValue, then have route 1 to disturb caused routejPower disturbance
Gross energy is
Similarly, route i disturbance causes the power disturbance gross energy of route j to be
Influence of the every route to itself is set as 0 i.e., thus obtain a route disturbance energy value。
Every a line is normalized respectively, is obtained corresponding
In conjunction with the weighted value of above each route, the alternating current circuit influence index based on line fault probability can be calculated:
CompareThe size of value, it is assumed that whenj=lWhen,Maximum is, showlItem
Route is maximum by the combined influence of other alternating current circuits, it may be selected as HVDC Modulation signal monitoring route.
Embodiment:
With PSD-BPA program, instance analysis, DC line rectification side net to be studied are carried out using certain actual electric network model
As shown in Fig. 2, the voltage class of each alternating current circuit is 500kV in Fig. 2, the transimission power of direct current system is about network structure
3000MW.The present embodiment is modulated to example in a manner of big and carries out HVDC Modulation.
By routeL 1,L 2,L 3,L 4,L 5,L 6Monitoring route is chosen as preliminary, first according to the actual situation to routeL 1,L 2,L 3,L 4,L 5,L 6The probability that breaks down is assessed, and the probability of the corresponding each alternating current circuit of setting is respectively as follows:g 1=0.3,g 2=0.1,g 3
=0.16,g 4=0.125,g 5=0.175,g 6=0.14, ifpValue is 1, then corresponding6The weight of route is settable such as 4 institute of table
Show.
It is right respectivelyL 1,L 2,L 3,L 4,L 5,L 6Microvariations are arranged in six routes, acquire first three pendulum disturbance energy of each line power
The sum of amount is simultaneously normalized, and the results are shown in Table 5.
According to the calculated result in table 5, the alternating current circuit influence index based on line fault probability is acquired:
Known by calculated resultMaximum, it is correspondingL 2Route should have best modulation as HVDC Modulation signal monitoring route
Effect.
In order to verify the reasonability for monitoring route selected by the above method, in the maximum route of fault rateL 1Upper setting
Three phase short circuit fault, time of fault inception 2s, duration 0.1s are emulated with PSD-BPA program, are selected respectivelyL 2,L 3,L 4,L 5,L 6When monitoring route of the alternating current circuit as big mode modulated signal, modulation effect comparison is as shown in Figure 3.
By Fig. 3, it can be seen that using alternating current circuitL 2When as monitoring route, generator's power and angle oscillation is minimum, direct current tune
Effect processed is best.
The above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made
When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.
Claims (2)
1. a kind of HVDC Modulation signal monitoring circuit selecting method, it is characterised in that: include the following steps,
S1: preliminary alternating current circuit of choosing is as monitoring route, and the preliminary alternating current circuit failure of choosing of assessment occurs according to the actual situation
Probability, and weighted value is assigned based on this for each alternating current circuit；
S2: being respectively set disturbance to preliminary alternating current circuit of choosing, thus solve m pendulum disturbance energy before each alternating current circuit power,
And normalized is done respectively；
S3: defining the alternating current circuit influence index based on line fault probability, i.e., by the disturbance energy after weighted value and normalization
Magnitude is accordingly calculated, and selects influence index maximum alternating current circuit in alternating current circuit as HVDC Modulation signal monitoring route；
It is as follows that the alternating current circuit influence index based on line fault probability is specifically defined mode,
Since the fault disturbance of alternating current circuit i leads to the power disturbance gross energy S of alternating current circuit jijIt is defined as
Influence of the every route to itself is set as 0 i.e. Sii=0, and to SijIt is normalized respectively, obtains corresponding S'ij
For
In conjunction with the weighted value of each alternating current circuit, the alternating current circuit influence index η based on line fault probability is definedj, that is, consider
Other alternating current circuits probability of malfunction fiWhen, alternating current circuit j can be expressed as
2. a kind of HVDC Modulation signal monitoring circuit selecting method according to claim 1, it is characterised in that: the step
In S3, select the maximum alternating current circuit of alternating current circuit influence index as HVDC Modulation signal monitoring route concrete mode such as
Under,
Compare ηjThe size of value, it is assumed that as j=l, ηlMaximum is ηl=max { ηj| j=1,2,3......n }, show the l articles friendship
Flow Line is maximum by the combined influence of other alternating current circuits, that is, selects it as HVDC Modulation signal monitoring route.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002238165A (en) * | 2001-02-14 | 2002-08-23 | Tokyo Electric Power Co Inc:The | Method and apparatus for detecting open state of circuit- breaker of distribution line in substation |
| CN105160148A (en) * | 2015-07-17 | 2015-12-16 | 华北电力大学 | AC-DC power grid cascading failure key line identification method |
| CN106033888A (en) * | 2015-03-19 | 2016-10-19 | 国家电网公司 | Online evaluation method for safety control amount of AC line fault based on speed-down DC sensitivity |
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2016
- 2016-11-04 CN CN201610958500.5A patent/CN106451520B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002238165A (en) * | 2001-02-14 | 2002-08-23 | Tokyo Electric Power Co Inc:The | Method and apparatus for detecting open state of circuit- breaker of distribution line in substation |
| CN106033888A (en) * | 2015-03-19 | 2016-10-19 | 国家电网公司 | Online evaluation method for safety control amount of AC line fault based on speed-down DC sensitivity |
| CN105160148A (en) * | 2015-07-17 | 2015-12-16 | 华北电力大学 | AC-DC power grid cascading failure key line identification method |
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