CN108964144A - Power shortage optimizes methodology after a kind of failure of more direct current sending end power grids - Google Patents
Power shortage optimizes methodology after a kind of failure of more direct current sending end power grids Download PDFInfo
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- CN108964144A CN108964144A CN201810696232.3A CN201810696232A CN108964144A CN 108964144 A CN108964144 A CN 108964144A CN 201810696232 A CN201810696232 A CN 201810696232A CN 108964144 A CN108964144 A CN 108964144A
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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
-
- 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
- H02J3/34—Arrangements for transfer of electric power between networks of substantially different frequency
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention discloses power shortages after a kind of failure of more direct current sending end power grids to optimize methodology, comprising: reads power grid related data and is analyzed data and handled；The power variation for calculating provincial control zone is determined and is positioned to the provincial control zone of failure；The whole network actual power vacancy amount after calculating various control measure work；It calculates each provincial control zone power shortage amount of sharing and is returned to school safely: if violating security constraint, correction amount being shared by region equivalent power generation each provincial control zone vacancy power of Calculation of Sensitivity；The power shortage amount of sharing is issued to each provincial control zone, involution to zero by way of forwarding remote regulating.This method by considering multi-stage scheduling multiclass control measure action situation after more direct current sending end electric network faults, shares by the high-power vacancy multizone coordination optimization after realizing failure, it is ensured that the fast quick-recovery of more direct current sending end mains frequencies and safe and highly efficient operation after disturbance.
Description
Technical field
The present invention relates to power shortages after a kind of failure of more direct current sending end power grids to optimize methodology, belongs to dispatching of power netwoks
Technical field.
Background technique
As China's DC engineering scale constantly expands, the direct current transportation method of operation is continuous to the stabilizing influence of AC system
Deepen, compared with receiving end load center system, the AC system of sending end Energy Base generally have small scale, installation scale it is big,
The features such as grid structure is weak, sending end AC system frequency problem is more prominent after system disturbs.
China's direct current sending end power grid is mostly the high accounting system of the clean energy resourcies such as water power, and Hydropower Unit is because inhibiting water hammer effect to produce
Raw ultra-low frequency oscillation and governor parameter is transformed, cause hydroelectric units primary frequency modulation ability to be greatly reduced；Part main force frequency modulation
Hydroelectric power plant sends out channel and is fully loaded with for a long time, and after the high-power vacancy failures such as direct current locking occur, the provincial control zone in part is adjustable
Automatic Generation Control (Automatic Generation Control, AGC) unit reserve is limited out, is unfavorable for the whole network after disturbance
The fast quick-recovery of frequency and power；Grid configuration hands over peace control to cut machine, direct current frequency control (Frequency Control, FC)
Etc. after systems put into operation, multiclass control measure lack coordination optimization, and less stress toning will have an adverse effect to operation of power networks；Power grid frequency
Each region is spare and tie line plan is mainly by virtue of experience formulated and modified by dispatcher after rate is restored, operation of power networks efficiency compared with
It is low.
Document one " East China Power Grid dynamic area control error the applied analysis " (end of the year 2010 of Automation of Electric Systems volume 34 the
8 phases page 106) it discloses a kind of consideration high electric power from outside and loses or spare shared method when high-power unit tripping,
It is to realize that the failure between control zone is supported, external disturbance is sent out using the transfer of dominant eigenvalues control responsibility between control zone
The tasks such as coordinated control when raw, and the distribution principle in each province and city and the cooperation side with evaluation consideration standard have been inquired into emphatically
Formula.
Document two " the coordination optimization scheduling strategy of emergency DC power support between being saved after extra-high voltage direct-current locking " (Chinese motor work
Journey journal o. 11th of volume 35 page 2695 in 2015) disclose a kind of urgent function between being adapted to the province after extra-high voltage direct-current is latched
Rate supports Optimized Operation strategy, it is contemplated that all kinds of unit regulation performances and controlling party in each interregional available transmission capacity and region
Formula establishes the power energy allocation method of two-level scheduler unit, and urgent power between saving is realized by net province two-stage coordinated control structure
It supports.
Document three " modeling of multizone Collaborative Control application technology (two) problem and improvement based on correcting region control deviation
Method " (Automation of Electric Systems the 2nd phase page 121 of volume 41 in 2017) disclose a kind of consideration actually available spare appearance inside the province
The allocation plan of amount establishes spare calculation optimization model, and the model meter and AGC unit reserve capacity and operation constrain, and obtains
It may bring up spare capacity, and improve operation of power networks reliability using security-constrained dispatch technology in failover procedure.
Document one proposes the foundation of dynamic area control error (ACE) technology and is pre-configured with original in grid generation resource satisfaction
On the basis of then, in due course Adjusted Option is lacked when resource status changes in receiving end power grid, when the spare appearance of certain provinces and cities
When amount is insufficient, may cause frequency can not restore for a long time；It is longer that dynamic ACE strategy starts the time, it is difficult to quickly support frequency
Restore；Artificial involution mode is used after adjustment, the relevant operation requirement since grid operating conditions constantly change, to dispatcher
It is higher.
Document two and document three propose the multizone spare shared scheme for considering profile constraints for receiving end power grid, are counting
Calculate can with it is adjustable spare in transmission line capability and region when all establish Optimized model, needed in line computation optimization algorithm calculate most
Excellent solution, computational efficiency are slower, it is difficult to be applicable in the quick variation of grid operating conditions after failure；The involution after the completion of control is not considered
Mode, it is difficult to practical in actual electric network operation.
Summary of the invention
It is an object of the invention to overcome deficiency in the prior art, function after a kind of failure of more direct current sending end power grids is provided
Rate vacancy optimizes methodology, and power grid is difficult to the technical issues of quickly supporting frequency retrieval after solving failure in the prior art.
In order to solve the above technical problems, the technical scheme adopted by the invention is that: a kind of failure of more direct current sending end power grids
Power shortage optimizes methodology afterwards, and described method includes following steps:
A, mains frequency data are acquired in real time, when mains frequency, which reaches, determines that threshold occurs for failure, power scheduling control
Branch center carries out fault distinguishing and positioning to each provincial control zone, and calculates the whole network actual power vacancy amount；
B, the power shortage amount of sharing of each provincial control zone is calculated；
C, judge whether interconnection section tidal current meets security constraint between each provincial control zone:
If meeting security constraints, the power shortage amount of sharing directly is issued to each province by way of forwarding remote regulating
Grade control zone；If being unsatisfactory for security constraints, the corresponding provincial equivalent power generation sensitivity in control zone is calculated, further to described
The power shortage amount of sharing is modified, then the revised power shortage amount of sharing is issued to each province by way of forwarding remote regulating
Grade control zone；
D, whether the deviation that judgement is forwarded between the remote regulating value of provincial control zone and return value the two of provincial control zone is big
In presetting safe threshold value, if deviation is no more than safe threshold value is preset, return step A resurveys mains frequency data；
Otherwise, stop power shortage immediately and share control process；
E, the power shortage amount of sharing involution mode is chosen, will be shared to the power shortage amount of the sharing involution of each provincial control zone
To 0.
Further, the power scheduling control branch center is according to the provincial control zone active power balance departure of reflection
District control deviation data and mains frequency deviation carry out fault distinguishing, the provincial control zone broken down to each provincial control zone
Meet following criterion:
Wherein:
ACEi=K (fa-fs)+(pa-ps) (2)
In formula, faFor mains frequency data；fsFor mains frequency a reference value；ftrgFor the fault verification door of mains frequency deviation
Threshold value；ACEiFor the district control deviation data of provincial control zone i；ACEtrgFor the fault verification threshold value of district control deviation；
K is the frequency bias coefficient of power grid；paFor dominant eigenvalues data, to provincial control zone outside export and be positive；psFor from electric power tune
The dominant eigenvalues planning data that degree control branch center obtains.
Further, the back off procedure that the whole network actual power vacancy amount considers direct current frequency control action is calculated, is being calculated
It is middle additionally to increase to direct current frequency control adjustment amount in the calculating of power shortage amount, the calculation formula of the whole network actual power vacancy amount
It is as follows:
Δ P=Ball×(fa-fs)+(preg-psche) (3)
Wherein, Δ P is the whole network actual power vacancy amount；BallFor preset the whole network frequency bias coefficient；faFor power grid
Frequency data；fsFor mains frequency a reference value；pregAlways add for a plurality of dc power after direct current frequency control action；pscheIt is current
Dc power plan value.
Further, the specific method is as follows for the power shortage amount of sharing of each provincial control zone of calculating:
Calculate the available unit reserve total amount for the provincial control zone broken down:
Wherein,For the available unit reserve total amount of provincial control zone m；NAFor undertake online adjusting unit number；
ri,tFor the unit reserve capacity for undertaking adjusting；NBFor the unit number for undertaking adjusting can be put into；sj,tAdjusting is undertaken for that can put into
Unit reserve capacity；The practical calling ratio of unit reserve capacity to undertake adjusting；For the machine for undertaking adjusting can be put into
The group practical calling ratio of spare capacity；
Calculate the power shortage amortization ratio of each provincial control zone:
Wherein,For the power shortage amortization ratio of provincial control zone m；M is the provincial control zone number for participating in sharing；
The power shortage amount of the sharing Δ P of provincial control zonemCalculation formula it is as follows:
Further, it is modified that the specific method is as follows to the power shortage amount of sharing:
Calculate the equivalent power generation sensitivity in provincial control zone:
In formula: Gm,LThe equivalent power generation sensitivity always added for unit in provincial control zone；N is unit in provincial control zone
Number；Gg,LFor the equivalent power generation sensitivity of unit g；For unit unit output variation in timing section of response control process
Amount；
According to the power shortage amount of sharing before amendmentWith the minimum optimization aim of total correction amount, seek meeting safety
The revised power shortage amount of sharing of constraintMethod particularly includes:
Wherein: min f is function of minimizing；M is the provincial control zone number for participating in sharing；N is required modified province
The number of grade control zone；For the revised power shortage amount of sharing；For the power shortage amount of sharing before amendment；
TL,tFor the security constraint lower limit of interconnection section；fa,tSection actual value is sent out for frequency modulation hydroelectric power plant of the main force；TH,tIt is disconnected for interconnection
The security constraint upper limit in face.
Further, the power shortage amount of sharing involution mode includes following several:
(1) oblique line of fixing time immediately restores: after dispatcher manually boots recovery, the power shortage point in preset time scale
Booth is measured according to oblique line involution to zero, and the oblique line slope is
Wherein, KsettimeFor the oblique line slope of the power shortage amount of sharing involution；ΔPmTo be actually issued to provincial control zone
The power shortage amount of sharing；TsetTo preset recovery time；
(2) planned value modifying point is reached, then oblique line recovery of fixing time: after dispatcher manually boots recovery, according to current electricity
Force system time automatic time delay to a nearest power generation plan value modifying point (integral point starts, primary every modification in 15 minutes)
Start formally to enter recovery process, then within a preset time by the power shortage amount of sharing according to oblique line involution to zero；
(3) recover immediately: dispatcher manually boots recover immediately after, the power shortage amount of sharing jumps 0 immediately, power after failure
Vacancy is shared process and is immediately finished.
Compared with prior art, the beneficial effects obtained by the present invention are as follows being: controlling branch center to provincial control in power scheduling
Safe logic of returning to school is added in forwarding data in area's processed, and realizes the automatic resetting of the high-power vacancy amount of sharing, realizes failure
High-power vacancy multizone coordination optimization afterwards is shared, it is ensured that the fast quick-recovery of more direct current sending end mains frequencies and safety after disturbance
Efficient operation.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is three kinds of involution mode control principle drawings；
In figure: Δ Ps' it is the high-power vacancy amount of sharing；T is delay reset time, can be manually arranged.
Specific embodiment
Power shortage optimizes methodology after the failure of more direct current sending end power grids provided by the invention, comprising: reads power grid
Related data is simultaneously analyzed data and is handled；The power variation for calculating provincial control zone, to the provincial control zone of failure into
Row determines and positioning；The whole network actual power vacancy amount after calculating various control measure work；Calculate each provincial control zone power
The vacancy amount of sharing simultaneously is returned to school safely: if violating security constraint, passing through region equivalent power generation each provincial control of Calculation of Sensitivity
Vacancy power in area's processed shares correction amount；The power shortage amount of sharing is issued to each provincial control zone by way of forwarding remote regulating,
Involution is to zero.This method is realized by multi-stage scheduling multiclass control measure action situation after the more direct current sending end electric network faults of consideration
High-power vacancy multizone coordination optimization after failure is shared, it is ensured that more fast quick-recoveries of direct current sending end mains frequency after disturbance
And safe and highly efficient operation.
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, power shortage optimizes methodology after the failure of more direct current sending end power grids provided by the invention, including
Following steps:
Step 1: branch center (hereinafter referred to as branch center) Automatic Generation Control (Automatic is controlled in power scheduling
Generation Control, AGC) application in read directly under the mains frequency data inside control area；
Step 2: local mains frequency data, provincial are read in the AGC application of the provincial control zone of branch center subordinate
The external dominant eigenvalues data in control zone and the tie line plan data for receiving branch center forwarding acquisition.
Step 3: the district control deviation (Area for being able to reflect provincial control zone active power balance departure is calculated
Control Error, ACE) data.ACE data need AGC apply by mains frequency data, dominant eigenvalues data and
Tie line plan data obtain after being calculated, calculation method are as follows:
ACEi=K (fa-fs)+(pa-ps) (1)
Wherein, ACEiFor the ACE data of provincial control zone i；K is the frequency bias coefficient of power grid；faFor mains frequency number
According to；fsFor mains frequency a reference value, 50Hz is generally taken；paFor dominant eigenvalues data, it is positive to region exterior output；psFor
The dominant eigenvalues planning data obtained from branch center.
Step 4: branch center monitors mains frequency data variation, when mains frequency deviation is more than 0.1Hz, branch center root
Change according to the real time data of provincial control zone ACE data and mains frequency departure, according to the positive and negative of ACE and mains frequency deviation
Number, disturbing source is navigated in conjunction with the comprehensive criterion of the formation such as ACE numerical value；If branch center fails to find generation event according to comprehensive criterion
The provincial control zone of barrier, then be judged to being branch center compass of competency internal fault, and is stored in the historical record of AGC application.
Power scheduling controls branch center according to the district control deviation for reflecting provincial control zone active power balance departure
Data and mains frequency deviation carry out fault distinguishing to each provincial control zone, and the provincial control zone broken down meets to be sentenced as follows
According to:
In formula, ftrgFor the fault verification threshold value of mains frequency deviation；ACEtrgFor the fault verification of district control deviation
Threshold value；
Step 5: when mains frequency deviation is more than 0.1Hz, branch center starts the whole network actual power vacancy after calculating failure
Amount.
In view of peace control cuts chance mains frequency is caused to change after failure: after frequency increases cut-out unit, function
Rate vacancy reduces, and actual power vacancy will be less than the power shortage of instant of failure, and the variation of mains frequency is arrived in reflection, therefore is being counted
It needs to combine mains frequency data when calculating power shortage；In addition to this, direct current frequency control (FC) according to frequency departure situation from
Dynamic increase and decrease transmission power, after frequency retrieval to certain threshold value will automatic resetting, involution process lacks the power filled up originally
Volume releases when will be in frequency retrieval to a certain range, gradually returns and spits to power grid, this part finally still needs AGC unit
It undertakes, needs to embody in the amount of sharing, it is therefore desirable to is additional to increase.
The calculation formula of the whole network actual power vacancy amount Δ P is as follows:
Δ P=Ball×(fa-fs)+(preg-psche) (3)
Wherein, BallFor preset the whole network frequency bias coefficient；faFor mains frequency data；fsFor mains frequency benchmark
Value；pregAlways add for a plurality of dc power after direct current frequency control action；pscheFor current dc power plan value.
Step 6: it after branch center judges that failure occurs, has been thrown according to unit inside provincial control zone each in fixed time period
Enter the power shortage allocation proportion used after line computation is broken down with factors such as non-input quantity, spare capacities, mainly examines
The factor of worry are as follows:
(61) consider that main force's frequency modulation hydroelectric power plant's action process sends out the influence of section tidal current to it
Wherein,Tl ,tSection security constraint lower limit is conveyed for main water power；fa,tSection time trend is conveyed for main force's water power
Value；NAFor undertake online adjusting unit number；ri,tFor the unit reserve capacity for undertaking adjusting；For the machine for undertaking adjusting
Group spare capacity can call ratio, between 0-1；Gi,lTo undertake the sensitivity for adjusting unit to conveying section；NBFor that can put into
Undertake the unit number of adjusting；sj,tFor the unit reserve capacity for undertaking adjusting can be put into；For the unit for undertaking adjusting can be put into
Capacity can call ratio, between 0-1；Gj,lNot put into the sensitivity for undertaking and adjusting unit to conveying section；For main water
The electricity conveying section security constraint upper limit；
(62) consideration undertakes the creep speed of the AGC unit of adjusting within a certain period of time and calculates the capacity that can climb, as machine
The constraint condition of group is calculated:
Wherein,For the downward creep speed of unit, unit MW/min；T1For the regulating cycle of AGC unit, unit is
min；ri,tFor the unit reserve capacity for undertaking adjusting；Ratio is called to undertake the unit reserve capacity of adjusting；For unit
Upward creep speed, unit MW/min；
The method for calculating the power shortage amount of sharing of provincial control zone is specific as follows:
Calculate the available unit reserve total amount for the provincial control zone broken down:
Wherein,For the available unit reserve total amount of provincial control zone m；NAFor undertake online adjusting unit number；
ri,tFor the unit reserve capacity for undertaking adjusting；NBFor the unit number for undertaking adjusting can be put into；sj,tAdjusting is undertaken for that can put into
Unit reserve capacity；To undertake the optimal solution that the unit reserve capacity of adjusting calls ratio；For the unit for undertaking adjusting
The practical calling ratio of spare capacity；For the practical calling ratio of unit reserve capacity for undertaking adjusting can be put into；
Wherein,For the power shortage amortization ratio of provincial control zone m；M is the provincial control zone number for participating in sharing；
The power shortage amount of the sharing Δ P of provincial control zonemCalculation formula it is as follows:
Step 7: monitoring whether the main interconnection section tidal current of provincial control interval meets security constraint, zoning
Equivalent power generation sensitivity is modified the power shortage amount of sharing issued to there is the case where violating security constraint.
It is modified that the specific method is as follows to the power shortage amount of sharing:
Calculate the equivalent power generation sensitivity in provincial control zone:
In formula: Gm,LThe equivalent power generation sensitivity always added for unit in provincial control zone；N is unit in provincial control zone
Number；Gg,LFor the equivalent power generation sensitivity of unit g；For unit unit output variation in timing section of response control process
Amount；
According to the power shortage amount of sharing before amendmentThe power shortage amount of sharing after considering security constraint can be used
Calculation method considers section and other supervision equipment security constraints with the minimum optimization aim of total correction amount, seeks meeting safety
The revised power shortage amount of sharing of constraintMethod particularly includes:
Wherein: min f is function of minimizing；M is the provincial control zone number for participating in sharing；N is required modified province
The number of grade control zone；For the revised power shortage amount of sharing；For the power shortage amount of sharing before amendment；
TL,tFor the security constraint lower limit of interconnection section and other supervision equipments；fa,tIt is practical that section is sent out for frequency modulation hydroelectric power plant of the main force
Value；TH,tFor the interconnection section security constraint upper limit.
Step 8: branch center sends each provincial control zone power shortage amount of sharing of calculating by way of forwarding remote regulating
Into each provincial control zone AGC application, and monitor the remote regulating value and provincial control zone return value deviation for being forwarded to provincial control zone
Whether it is greater than and presets safe threshold value, shares control process when deviation stops high-power vacancy more than safe threshold value immediately.
Using safe logic of returning to school in repeating process, branch center forwards the provincial control zone power shortage amount of sharing using remote regulating
It is sent to each provincial control zone in real time, which is used remote regulating later by the remote regulating value that provincial control zone receives branch center forwarding again
It is forwarded to branch center control zone, increases the function of returning to school during forwarding remote regulating, prevents from causing accidentally to control because of transmission error in data
Phenomenon occurs.
Step 9: dispatcher can take a variety of vacancy amount of sharing automatic resetting modes after frequency retrieval, according to interconnection
Unit reserve replacing velocity inside plan modification progress and each provincial control zone, will share to the power shortage of each provincial control zone
Automatic resetting is measured to zero.As shown in Fig. 2, the power shortage amount of sharing that provincial control zone forwards branch center in example power grid is direct
Provincial control zone ACE is replaced, therefore is named as dynamic ACE.The involution process of dynamic ACE is mainly the following mode:
(1) oblique line of fixing time immediately restores: after dispatcher manually boots recovery, the power shortage point in preset time scale
Booth is measured according to oblique line involution to zero, and the oblique line slope is
Wherein, KsettimeFor the oblique line slope of the power shortage amount of sharing involution process；ΔPmTo be actually issued to provincial control
The power shortage amount of sharing in area；TsetTo preset recovery time；
(2) reach planned value modifying point fix time again oblique line recovery: after dispatcher manually boots recovery, according to current electric power
System time automatic time delay is just opened to a nearest power generation plan value modifying point (integral point starts, primary every modification in 15 minutes)
Begin formally to enter recovery process, then within a preset time by the power shortage amount of sharing according to oblique line involution to zero, involution process
Oblique line slope calculation method such as formula (13), be Ksettime；
(3) recover immediately: dispatcher manually boots recover immediately after, the power shortage amount of sharing jumps 0 immediately, power after failure
Vacancy is shared process and is immediately finished.
According to the plan modification time scale of example power grid and the operating habit of dispatcher, selection oblique line of fixing time immediately is extensive
It is multiple, and the length T that fixes time is setsetFor 15min.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. power shortage optimizes methodology after a kind of failure of more direct current sending end power grids, it is characterised in that: the method includes
Following steps:
A, mains frequency data are acquired in real time, when mains frequency, which reaches, determines that threshold occurs for failure, in power scheduling control point
The heart carries out fault distinguishing and positioning to each provincial control zone, and calculates the whole network actual power vacancy amount；
B, the power shortage amount of sharing of each provincial control zone is calculated；
C, judge whether interconnection section tidal current meets security constraint between each provincial control zone:
If meeting security constraints, the power shortage amount of sharing directly is issued to each provincial control by way of forwarding remote regulating
Area processed；If being unsatisfactory for security constraints, the corresponding provincial equivalent power generation sensitivity in control zone is calculated, further to the power
The vacancy amount of sharing is modified, then the revised power shortage amount of sharing is issued to each provincial control by way of forwarding remote regulating
Area processed；
D, whether the deviation that judgement is forwarded between the remote regulating value of provincial control zone and return value the two of provincial control zone is greater than pre-
If safe threshold value, if deviation is no more than safe threshold value is preset, return step A resurveys mains frequency data；It is no
Then, stop power shortage immediately and share control process；
E, the power shortage amount of sharing involution mode is chosen, will be shared to the power shortage amount of the sharing involution of each provincial control zone to 0.
2. power shortage optimizes methodology after the failure of more direct current sending end power grids according to claim 1, feature exists
In the power scheduling control branch center is according to the district control deviation number for reflecting provincial control zone active power balance departure
Fault distinguishing is carried out to each provincial control zone according to mains frequency deviation, the provincial control zone broken down meets following criterion:
Wherein:
ACEi=K (fa-fs)+(pa-ps) (2)
In formula, faFor mains frequency data；fsFor mains frequency a reference value；ftrgFor the fault verification threshold of mains frequency deviation
Value；ACEiFor the district control deviation data of provincial control zone i；ACEtrgFor the fault verification threshold value of district control deviation；K
For the frequency bias coefficient of power grid；paFor dominant eigenvalues data, to provincial control zone outside export and be positive；psFor from electric power tune
The dominant eigenvalues planning data that degree control branch center obtains.
3. power shortage optimizes methodology after the failure of more direct current sending end power grids according to claim 1, feature exists
In calculating the whole network actual power vacancy amount considers the back off procedure of direct current frequency control action, by direct current frequency control in calculating
Adjustment amount processed additionally increases in the calculating of power shortage amount, and the calculation formula of the whole network actual power vacancy amount is as follows:
△ P=Ball×(fa-fs)+(preg-psche) (3)
Wherein, △ P is the whole network actual power vacancy amount；BallFor preset the whole network frequency bias coefficient；faFor mains frequency
Data；fsFor mains frequency a reference value；pregAlways add for a plurality of dc power after direct current frequency control action；pscheFor current direct current
Power planning value.
4. power shortage optimizes methodology after the failure of more direct current sending end power grids according to claim 1, feature exists
In the specific method is as follows for the power shortage amount of sharing of each provincial control zone of calculating:
Calculate the available unit reserve total amount for the provincial control zone broken down:
Wherein,For the available unit reserve total amount of provincial control zone m；NAFor undertake online adjusting unit number；ri,t
For the unit reserve capacity for undertaking adjusting；NBFor the unit number for undertaking adjusting can be put into；sj,tFor the machine for undertaking adjusting can be put into
Group spare capacity；The practical calling ratio of unit reserve capacity to undertake adjusting；For can put into undertake adjusting unit it is standby
With the practical calling ratio of capacity；
Calculate the power shortage amortization ratio of each provincial control zone:
Wherein,For the power shortage amortization ratio of provincial control zone m；M is the provincial control zone number for participating in sharing；
The power shortage amount of the sharing △ P of provincial control zonemCalculation formula it is as follows:
5. power shortage optimizes methodology after the failure of more direct current sending end power grids according to claim 1, feature exists
In being modified that the specific method is as follows to the power shortage amount of sharing:
Calculate the equivalent power generation sensitivity in provincial control zone:
In formula: Gm,LThe equivalent power generation sensitivity always added for unit in provincial control zone；N is unit number in provincial control zone；
Gg,LFor the equivalent power generation sensitivity of unit g；For response control process unit in timing section unit output variable quantity；
According to the power shortage amount of sharing before amendmentWith the minimum optimization aim of total correction amount, seek meeting security constraint
The revised power shortage amount of sharingMethod particularly includes:
Wherein: min f is function of minimizing；M is the provincial control zone number for participating in sharing；N is required modified provincial control
The number in area processed；For the revised power shortage amount of sharing；To correct the preceding power shortage amount of sharing；TL,tFor connection
The security constraint lower limit of winding thread section；fa,tSection actual value is sent out for frequency modulation hydroelectric power plant of the main force；TH,tFor the peace of interconnection section
The staff cultivation upper limit.
6. power shortage optimizes methodology after the failure of more direct current sending end power grids according to claim 1, feature exists
In the power shortage amount of sharing involution mode includes following several:
(1) oblique line of fixing time immediately restores: after dispatcher manually boots recovery, the power shortage amount of sharing in preset time scale
According to oblique line involution to zero, the oblique line slope is
Wherein, KsettimeFor the oblique line slope of the power shortage amount of sharing involution；△PmFor the power for being actually issued to provincial control zone
The vacancy amount of sharing；TsetTo preset recovery time；
(2) planned value modifying point is reached, then oblique line recovery of fixing time: after dispatcher manually boots recovery, according to current power train
System time automatic time delay just starts formally to enter recovery process to a nearest power generation plan value modifying point, then when default
In by the power shortage amount of sharing according to oblique line involution to zero；
(3) recover immediately: dispatcher manually boots recover immediately after, the power shortage amount of sharing jumps 0 immediately, power shortage after failure
Share process to be immediately finished.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810696232.3A CN108964144A (en) | 2018-06-29 | 2018-06-29 | Power shortage optimizes methodology after a kind of failure of more direct current sending end power grids |
Applications Claiming Priority (1)
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