CN109301845A - Method is stabilized in the active fluctuation of extra-high voltage interconnection based on master-slave mode energy storage coordinated control - Google Patents
Method is stabilized in the active fluctuation of extra-high voltage interconnection based on master-slave mode energy storage coordinated control Download PDFInfo
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Abstract
Method is stabilized in the active fluctuation of extra-high voltage interconnection based on master-slave mode energy storage coordinated control.It is related to electric grid secondary frequency modulation technology field, and in particular to method is stabilized in a kind of active fluctuation of extra-high voltage interconnection based on master-slave mode energy storage coordinated control.Provide it is a kind of according to BESS itself frequency modulation feature, meet extra-high voltage interconnected network the extra-high voltage interconnection actually required based on master-slave mode energy storage coordinated control it is active fluctuation stabilize method.BESS may be implemented to the decoupling control of dominant eigenvalues and frequency fluctuation in the present invention, interconnection tie power fluctuation can effectively be inhibited under the premise of guaranteeing that mains frequency is stablized, to meet requirement of the regional power grid of extra-high voltage connection to interconnection exchange power stability；The present invention guarantees that regional power grid meets the performance assessment criteria of grid company using control performance standard CPS as judging quota.
Description
Technical field
The present invention relates to electric grid secondary frequency modulation technology fields, and in particular to a kind of spy based on master-slave mode energy storage coordinated control
Method is stabilized in the active fluctuation of high pressure interconnection.
Background technique
Three norms one of of the power system frequency as characterization power quality, it is close with the safe and stable operation relationship of power grid
It cuts.Automatic Generation Control (AGC) as the important technical for maintaining system frequency stable, extremely close by effect in the power system
It is important.With the rapid development of electric system, the interconnection degree between regional power grid is also increasingly reinforced.Compared with non-interconnected power grid,
Interconnected network is other than needing to guarantee frequency stabilization, it is also necessary to Tie line Power between regional power grid be maintained to transport according to plan
Row.At the same time, to avoid influencing the frequency of entire electric system because regional power grid a certain in interconnected network shirks frequency regulating duty
Rate is stablized, and grid company has formulated a series of appraisal standards, to reach each regional power grid regulating power of evaluation, limitation opportunistic practice
Purpose.
Control performance standard (CPS) is generallyd use to the evaluation of Automatic Generation Control in the world now, comprising CPS1 and
Two standards of CPS2.Specifically, CPS1 measures the variation characteristic and its and system of regional power grid using mathematical statistics method
The relationship of frequency departure, effect are assessment frequency departures；CPS2 is then used for assessment area power grid control interconnection trend deviation
Ability.CPS standard is taken in China's electric system at this stage substantially.
Currently, the AGC control strategy under participating in electric system for energy storage has the method for following two parts of patents lists.
Patent name be the extra-high voltage dominant eigenvalues control method of responsibility degree index " a kind of consider ", application No. is
The Chinese patent of " 201410046792.6 " proposes: establishing a main control region in AGC system, realizes the area of interconnected network
Domain control, sets the threshold value of the regional power grid Yu interconnected network interconnection tie power fluctuation qualification, according to area control mode meter
The responsibility degree index for calculating control area ACE and interconnection tie power fluctuation calculates responsibility degree component according to responsibility degree index, according to meter
It calculates ACE and interconnection tie power fluctuation responsibility degree index calculates regulation power demand, finally by power adjustment requirements in control unit
Between be allocated.
Patent name be the AGC control method and control system of electric grid secondary frequency modulation " energy storage participation ", application No. is
The Chinese patent of " 201510888434.4 " proposes: generating power grid according to the frequency departure of power grid and Tie line Power deviation
Real-time region control error and real-time region control instruction；According to control interval locating for real-time region control error, utilize
The regulated quantity and its initial state-of-charge of real-time region control instruction and default control assignment of logical battery energy storage system determine electricity
The real-time state-of-charge of pond energy-storage system determines therefrom that the practical adjustments amount of battery energy storage system.
But above method can no longer meet the regional power grid of extra-high voltage connection to interconnection exchange power stability
It is required that.
In recent years, power grid frequency modulation is participated in by industry extensive concern using extensive battery energy storage power station (BESS).BESS exists
Have many advantages, such as that fast response time, control are flexibly accurate in power grid frequency modulation, can largely improve frequency modulation effect, and carry out
Row frequency modulation means more more flexible than conventional rack.How BESS is flexibly controlled in interconnected network, stabilizes interconnection electricity to reach
Net frequency departure and interconnection tie power fluctuation are the critical issues that BESS participates in that lower interconnected network AGC needs to solve.
Under participating in existing control specifically for BESS, effectively stabilizing interconnected network interconnection, active to stabilize method less.
Meanwhile higher requirement also proposed to interconnection exchange power stability by the regional power grid of extra-high voltage connection, therefore, it is necessary to mention
Effective extra-high voltage interconnection is active out stabilizes method to meet this requirement.
Summary of the invention
The present invention in view of the above problems, provide it is a kind of according to BESS itself frequency modulation feature, meet extra-high voltage interconnected network
The extra-high voltage interconnection actually required based on master-slave mode energy storage coordinated control it is active fluctuation stabilize method.
The technical scheme is that including the following steps:
1) AGC essential information needed for extra-high voltage interconnected network, is obtained；
2) two neighboring power grid control region frequency modulation control performance standard CPS1 and CPS2, are calculated；
3) the participation factor of each regional power grid BESS, is calculated
4) it, determines regional power grid BESS charge and discharge criteria and participates in factor K jointlyB；
5), control BESS executes charge and discharge instruction.
Required AGC essential information in the step 1) includes following information:
1. interconnected network adjacent control regions frequency deviation fi, Δ fj
2. interconnected network adjacent control regions control error ACEi, ACEj
3. interconnection active power power deviation Δ P between interconnected network adjacent areaij
ACEi=Δ Pij+BiΔfi (1)
ACEj=-Δ Pij+BjΔfj (2)
Wherein, when above-mentioned parameter addition subscript i, the relevant parameter of region i is referred to；When adding subscript j, region is referred to
The relevant parameter of j.B is the frequency bias coefficient of regional power grid setting, and unit MW/0.1HZ takes positive sign.
CPS1 and CPS2 are calculated as follows in the step 2):
CPS1=100% (2-AyG { CF1 }) (3)
Wherein, ε1Refer to regional power grid to the control target value of the root-mean-square value of annual 1 minute frequency averaging deviation, list
Position is Hz；ΔF1Refer to the average value of 1 minute frequency departure, ACE10Refer to that the interconnected network region control in 10 minutes misses
The average value of difference；L10Refer to the control limitation of the absolute value in 10 minutes to ACE average value；CF1 is for evaluating control area
AGC control influence to entire interacted system frequency；CF2 refers to the ratio of the every 10 minutes average value of ACE and control limitation
Value.
The participation factor of each regional power grid BESS in the step 3)It calculates as follows:
Factor K is participated in jointly in the step 4)BDetermination method are as follows:
1. working as KBi *Less than KBj *, and KBi *When >=0, KBEqual to KBj *, BESSiFor main BESS, BESSjFor from BESS；
2. working as KBj *Less than KBi *, and KBj *When >=0, KBEqual to KBi *, BESSjFor main BESS, BESSiFor from BESS；
3. working as KBi *And KBj *When being equal to 0, controlled using existing AGC to carry out Δ PijRecovery.
The charge-discharge electric power of regional power grid i and regional power grid j are respectively P in the step 5)BiAnd PBj, PBiAnd PBjSize
Identical, charge and discharge are contrary；
By comparing PBi *And PBj *The size of absolute value, and take wherein lesser value obtain PBiAnd PBjValue, PBi *And PBj *
Calculation method it is as follows, work as SoCi< SoCmin, and battery is required further to discharge or SoCi> SoCmax, and require battery into one
When step charging,Remaining situationSame mode can be calculatedWherein SoC represents battery
The state-of-charge of energy storage.
The beneficial effects of the present invention are: the present invention exchanges power stability to interconnection according to the regional power grid that extra-high voltage connects
Property requirement using CPS1 and CPS2 frequency modulation control performance standard, determine region electricity from the characteristic of extra-high voltage interconnected network
BESS charge and discharge criteria is netted, and finally executes charge and discharge instruction, has effectively stabilized the active fluctuation of interconnected network interconnection.Furthermore by
The active imbalance to generate electricity between load is not directly compensate in BESS, so demand of the present invention to BESS power capacity is significantly
It reduces；The characteristics of coupling synchronous with mains frequency different from conventional rack, the present invention may be implemented BESS to dominant eigenvalues and
The decoupling control of frequency fluctuation can effectively inhibit interconnection tie power fluctuation under the premise of guaranteeing that mains frequency is stablized, with full
Foot meets requirement of the regional power grid of extra-high voltage connection to interconnection exchange power stability；The present invention is by control performance standard
CPS guarantees that regional power grid meets the performance assessment criteria of grid company as judging quota.
Detailed description of the invention
Fig. 1 is work flow diagram of the invention,
Fig. 2 is the substandard qualified operation area CPS1,
A is the CPS change curve of regional power grid 1 and regional power grid 2 in the embodiment of the present invention in Fig. 3,
B is the respective participation factor variations curve of two regional power grids in the embodiment of the present invention in Fig. 3,
C is the common participation factor variations curve of two regional power grids in the embodiment of the present invention in Fig. 3,
In Fig. 3 d be in the embodiment of the present invention in two regional power grids BESS contribute change curve,
Fig. 4 is master-slave mode energy storage control method for coordinating dominant eigenvalues change curve in the embodiment of the present invention.
Specific embodiment
The present invention is illustrated with reference to the accompanying drawing.
As shown in Figure 1, the active fluctuation side of stabilizing of the extra-high voltage interconnection of the invention based on master-slave mode energy storage coordinated control
Method includes the following steps:
Step 1: obtaining AGC essential information needed for extra-high voltage interconnected network
Extra-high voltage interconnected network variable frequency power source includes conventional rack and battery energy storage power station, and essential information includes
1. interconnected network adjacent control regions frequency deviation fi, Δ fj
2. interconnected network adjacent control regions control error ACEi, ACEj
3. interconnection active power power deviation Δ P between interconnected network adjacent areaij
ACEi=Δ Pij+BiΔfi (I)
ACEj=-Δ Pij+BjΔfj (2)
Wherein, when above-mentioned parameter addition subscript i, the relevant parameter of region i is referred to；When adding subscript j, region is referred to
The relevant parameter of j.B is the frequency bias coefficient of regional power grid setting, which is constant, and unit MW/0.1HZ takes positive sign
[generally determined by grid company, generally according to motor primary frequency modulation difference coefficient (difference coefficient σ indicate reactive current from zero increase
When being added to rated value, the opposite variation of generator voltage) it determines, for example difference coefficient is that 3%~5%, B value can use its inverse
0.5-2 times, i.e. 10-66.6].
Field frequency deviation delta fiWith Δ fjIt is the mains frequency in the region and the difference of power grid identification frequency, China's power grid
Identification frequency is 50Hz.ΔPijIt is that realtime power exchanges the deviation exchanged with unscheduled power between two control areas.Δfi, Δ
fjWith Δ PijBy system SCADA (Data acquisitionWith supervisor control) real-time measurement.
Step 2: calculating power grid control region frequency modulation control performance standard (CPS)
The active fluctuation of extra-high voltage interconnection based on master-slave mode energy storage coordinated control, which is stabilized, to be needed to calculate separately out in method
The frequency modulation control performance standard of two neighboring regional power grid, this patent are used in the widely used CPS standard in China, it includes
Two standards of CPS1 and CPS2.Based on the substandard specific calculation of the regional power grid frequency modulation control performance indicator such as formula of CPS
(3) shown in-(6):
CPS1=100% (2-AVG { CF1 }) (3)
Wherein, ε1Refer to regional power grid to the control target value of the root-mean-square value of annual 1 minute frequency averaging deviation, list
Position be Hz (be the frequency departure constant away from some target frequency, usually take 1 year based on one minute average frequency with it is specified
The root-mean-square value of frequency departure.The value of adjacent control regions is identical)；ΔF1Refer to the average value of 1 minute frequency departure；
ACE10Refer to the average value of the interconnected network area control error in 10 minutes；L10It refers in 10 minutes to ACE average value
Absolute value control limitation.The AGC that CF1 is used to evaluate control area controls the influence to entire interacted system frequency, is
Basic control variable in CPS1；CF2 refers to the ratio of the every 10 minutes average value of ACE and control limitation.
L10It calculates as follows:
Wherein, ε10In 1 year given, the root-mean-square value of 10 minutes average value of system actual frequency and standard frequency deviation
(unit Hz), Bi are the frequency bias coefficient of control zone i, and it is each control that Bs, which is the total frequency bias coefficient of interconnected electric power system,
The average value of area's frequency bias coefficient.
Step 3: respectively assessment area power grid frequency modulation control performance standard (CPS)
According to the CPS calculated result in step 2, the participation factor of each regional power grid BESS is determinedCalculate the participation because
Son is to determine that each regional power grid BESS while stabilizing extra-high voltage Tie line Power, avoids regional power grid from occurring
CPS is not up to standard and the case where by sanctioning.
Because what CPS2 mainly reflected is controlling extent of the AGC to interconnection, this method is for stabilizing interconnection wave
Dynamic, that CPS2 is not exceed standard certainly, and the calculating cycle of CPS2 is 10 minutes, this time scale and control
Time scale can not match, and therefore, CPS1 only be considered in this case.
Fig. 2 is the substandard qualified operation area CPS1, as CPS1 > 200%, system frequency restore pressing degree compared with
Small, when CPS1 is from 200% to 150%, pressing degree is stepped up, and is considered more urgent from 150% to 100%, small
It is not just the qualified operation area of CPS1 in 100%.
Range, i.e. CPS1 ∈ [100%, 200%], the direction ACE and Δ f phase are outlined in the qualified operation area of CPS1 such as figure
Instead (Δ f × ACE < 0) i.e. illustrates that system is little to the pressing degree of frequency retrieval, Ke Yiyou second and fourth quadrant in Fig. 2
Dominant eigenvalues deviation is first stabilized, the method for the invention is executed；Similarly, ACE (Δ f × ACE > 0) identical as the direction Δ f, i.e.,
First and third quadrant in figure, with the reduction of CPS1 value, system continues to increase the pressing degree of frequency retrieval, stabilizes contact
The degree of priority of linear heat generation rate deviation gradually reduces, once CPS1≤150%, then stop using the method for the invention.
So participating in the factor according to the calculated result of CPSIt will appear following three kinds of situations, be described as follows:
Situation 1: if Δ f and ACE symbol are opposite (positive and negative each other), the CPS1 in the region is more than 200%.In such case
Under, BESS can only consider to stabilize Δ PijAnd ignore the recovery of Δ f, K at this timeB *It is maximized KB, max, KB, maxRepresenting BESS can join
With stabilize that interconnection is active to fluctuate the maximum parameter stabilized, the value of this numerical value will be chosen by root locus diagram.
Situation 2: if Δ f and ACE symbol is identical (with just or with negative), and the value of CPS1 is greater than 150%, then BESS needs
Interconnected network is taken into account to Δ PijWith stabilizing for Δ f, at this time KB *Value is
Situation 3: if Δ f and ACE symbol is identical, and the value of CPS1 less than 150%, then BESS does not need to take into account interconnection electricity
Net is to Δ PijWith stabilizing for Δ f, and the operating condition of BESS must be conducive to the recovery of Δ f, at this time KB *Value is 0.
Step 4: determining regional power grid BESS charge and discharge criteria and participate in the factor jointly
In this step, according to K in previous stepBi *And KBj *Exploitation adjacent area power grid BESS common participation
Factor KBAnd the charging and discharging state of each BESS, the step are that the extra-high voltage interconnection based on master-slave mode energy storage coordinated control has
Function fluctuates the core for stabilizing method.After regional power grid is disturbed, the participation factor K of adjacent area power gridBi *And KBj *It can divide
For following three kinds of situation discussion, to determine KBValue.It is described as follows:
Situation 1:KBi *Less than KBj *, and KBi *>=it is 0
In this case, the CPS1 of regional power grid j is larger, and the BESS of regional power grid i is main BESS, and regional power grid j
BESS is from BESS.As the BESS from regional power grid, BESSjIt can only focus on and stabilize Δ PijFluctuation without consider to Δ f
Recovery.Simultaneously as BESSiOperating condition must be conducive to the recovery of Δ f, therefore the charge and discharge criteria of BESS then reference zone electricity
Net the charge and discharge criteria of BESS in i.I.e. if BESSiCharging action is executed, then BESSjDischarging action is executed, vice versa.So
And due to BESSjMovement be unfavorable for the recovery of regional power grid Δ f, therefore the common participation factor K of adjacent area power grid BESSB
Equal to KBj *。
Increase assuming that load step occurs for regional power grid i, leads to Δ f in the several secondsi, Δ fjWith Δ PijIt is negative, wherein Δ Pij
Being negative, which indicates active, is transmitted to regional power grid i from regional power grid j.According to formula (1), the ACE of regional power grid iiIt is negative, with Δ fiSymbol
It is number identical.Under normal circumstances, the CPS1 of regional power grid i is poor at this time, and the BESS in the regional power grid should preferentially restore Δ fi。
Only BESSiElectric discharge, just can then stabilize Δ f simultaneouslyiWith Δ Pij.Therefore, BESSiIt must operate at discharge mode, so BESSj
It should work in charge mode.The case where regional power grid j, then can be according to formula (2), ACEjSymbol by-Δ PijAnd BjΔfjAlgebra
And decision.As-Δ PijWhen larger, CPS1 is greater than 200%；And as-BjΔfjWhen larger, CPS1 is also typically larger than 150%.Cause
This, regional power grid CPS1 still has biggish nargin, BESSjIt can be absorbed in and stabilize Δ PijFluctuation.But due to BESSjWork
Condition is unfavorable for restoring the Δ f of the regional power gridj, it is therefore necessary to think over the charge power size of BESS.So the two areas
The common participation factor K of domain power grid BESSBIt is equal to KBj *.In conclusion under the method for the present invention execution, BESSiElectric discharge,
BESSjCharging, the power absolute value of the two are equal.At this point, being conducive to Δ P to the control of principal and subordinate BESSijRecovery.In addition, to the greatest extent
Pipe Δ fjBecause of BESSjOperating condition and deteriorate, but by monitor CPS1 can be limited in a certain range.If regional power grid j's
CPS1 is unsatisfactory for requiring, then excessively to other two kinds of situations.
Situation 2:KBj *Less than KBi *, and KBj *>=it is 0
Situation 2 is opposite with situation 1.According to the operation rule of master-slave mode energy storage control method for coordinating, in each regional power grid
BESS charging and discharging state by KBj *It determines, at this time KBj *Less than KBi *.In this case, the common ginseng of adjacent area power grid BESS
With factor KBEqual to KBi *。
Situation 3:KBi *And KBj *It is equal to 0
Situation 3 indicates the case where two regional power grids are all interfered, and existing AGC control is conducive to Δ P at this timeij's
Restore, does not need to stabilize Δ P using the methodij.AGC is produced by the offset of proportional plus integral control response frequency in traditional sense
The ACE component that raw ACE component and Tie line Power offset generate, the power output for controlling unit join system frequency and region
Winding thread exchange power maintains planned value.
Step 5: control BESS executes charge and discharge instruction
The common participation factor of interconnected network BESS charge and discharge criteria and adjacent power grid, the step are had determined that according to above-mentioned steps
Suddenly it will be required to execute charge and discharge instruction by BESS according to result, the size that principal and subordinate BESS is charged and discharged is identical, contrary.
However, the actual condition of BESS is limited by battery behavior, such as rated power PB,rated, rated capacity EB_ratedAnd lotus
Electricity condition SoC.Firstly, the active power output of BESS is between specified maximum discharge power PB,rated maxWith specified maximum charge power
PB,rated -maxBetween.SoC must be kept within the acceptable range, such as between 20% to 80% in real time simultaneously.In the step
In implementation procedure, as (SoC < SoCmin&PB> 0) or (SoC > SoCmax&PB< 0) when, BESS is removed to overcharge or over-discharge
Electricity.The calculation formula of SoC is such as shown in (7) and (8).
Wherein EB(tn) and EB(tn-1) it is t respectivelynAnd tn-1The energy stored in moment BESS, PB(tn) be BESS output
Power (symbol, which is positive, represents electric discharge, otherwise is charging), η+And η-It is not the efficiency for charge-discharge of BESS, takes η in this case+=0.9,
η-=0.95, SoC (tn) represent tnThe state-of-charge of moment battery energy storage, EB.ratedRepresent the rated capacity of BESS, PBIt is PBiWith
PBjGeneric representation.
According to the power grid output calculation P that respectively regional power grid BESS can be provided in the stepBi *And PBj *.Calculation is such as
Under, work as SoCi< SoCmin, and battery is required further to discharge or SoCi> SoCmax, and when battery being required further to charge,Remaining situationSame mode can be calculatedSince control method requires adjacent control
Area cells charge-discharge electric power size processed is identical, and charge and discharge are contrary, so further comparing PBi *And PBj *Value, determine
BESS final output PBiAnd PBj.Specifically, PBiAnd PBjValue be PBi *And PBj *The middle smaller value of absolute value, charge and discharge side
To PBiSame PBi *, PBjSame PBj *。
In conclusion by practicing this 5 steps, the method for the invention can effectively stabilize Δ P in AGCij's
Fluctuation, and the recovery effects of Δ f are improved to a certain extent.In addition, the AGC performance of each regional power grid is still through monitoring
CPS guarantees, and guarantees the SoC of BESS within controlled range.
It is illustrated below with reference to beneficial effect of the embodiment to technical solution of the present invention.
According to power grid practical operation situation, critical data is extracted, simulates the regional power grid of two interconnections, regional power grid 1
Generated output 2500MW, load 2400MW；The generated output 1900MW of regional power grid 2, load 2000MW；Between regional power grid
Tie line Power be 100MW, direction be from regional power grid 1 to regional power grid 2；Conventional rack difference coefficient value is
5%, 5 are taken when inertia constant H is using 100MW as benchmark, synchronizing torque coefficient is 1.2.BESS parameter in each region is 25MW/
5MWh；The a reference value that whole system is calculated using 2000MW as per unit value.
The present invention is counted using simulink (one of MATLAB Visual Simulation Tools) software in matlab
It calculates, net load fluctuation given at random is inputted into simulink, if regional power grid 2 is occurring 0.05% (1MW) p.u. for 10s
Step load fluctuation, mains frequency and control area error change therewith, believe substantially as power grid required for step 1
Breath.Then software successively calculates each value in step 2), and draws each correlation curve.Fig. 3 (a) is region in the embodiment
The CPS change curve of power grid 1 and regional power grid 2；Fig. 3 (b) is the respective participation factor variations curve of two regional power grids；Fig. 3 (c)
For the common participation factor variations curve of two regional power grids；Fig. 3 (d) is BESS power output change curve in two regional power grids.Pass through
CPS computing module calculates the value of CPS, as shown in Fig. 3 (a) in real time；Then the participation factor of corresponding each regional power grid is calculatedWithAs shown in Fig. 3 (b)；In charge-discharge modules, the case is calculated and belongs to situation 2, i.e.,It is greater thanRoot
According to the rule of the method, at this point, KBIt is equal toTherefore shown in the common participation factor such as Fig. 3 (c) of two regional power grids.Therefore,
It obtains shown in charge status such as Fig. 3 (d) of two regional power grid BESS.
Fig. 4 is the dominant eigenvalues change curve of master-slave mode energy storage control method for coordinating and tradition AGC control method, by scheming
It is found that compared with traditional AGC method interconnection tie power fluctuation spike can be substantially reduced using the present invention, therefore the present invention can
Effectively to inhibit interconnection tie power fluctuation under the premise of guaranteeing that mains frequency is stablized.
Claims (6)
1. method is stabilized in the active fluctuation of the extra-high voltage interconnection based on master-slave mode energy storage coordinated control, which is characterized in that including such as
Lower step:
1) AGC essential information needed for extra-high voltage interconnected network, is obtained；
2) two neighboring power grid control region frequency modulation control performance standard CPS1 and CPS2, are calculated；
3) the participation factor of each regional power grid BESS, is calculated
4) it, determines regional power grid BESS charge and discharge criteria and participates in factor K jointlyB；
5), control BESS executes charge and discharge instruction.
2. the active fluctuation side of stabilizing of the extra-high voltage interconnection according to claim 1 based on master-slave mode energy storage coordinated control
Method, which is characterized in that the required AGC essential information in the step 1) includes following information:
1. interconnected network adjacent control regions frequency deviation fi, Δ fj
2. interconnected network adjacent control regions control error ACEi, ACEj
3. interconnection active power power deviation Δ P between interconnected network adjacent areaij
ACEi=Δ Pij+BiΔfi (1)
ACEj=-Δ Pij+BjΔfj (2)
Wherein, when above-mentioned parameter addition subscript i, the relevant parameter of region i is referred to；When adding subscript j, refer to region j's
Relevant parameter.B is the frequency bias coefficient of regional power grid setting, and unit MW/0.1HZ takes positive sign.
3. the active fluctuation side of stabilizing of the extra-high voltage interconnection according to claim 1 based on master-slave mode energy storage coordinated control
Method, which is characterized in that CPS1 and CPS2 are calculated as follows in the step 2):
CPS1=100% (2-AVG { CF1 }) (3)
Wherein, ε1Regional power grid is referred to the control target value of the root-mean-square value of annual 1 minute frequency averaging deviation, unit is
Hz；ΔF1Refer to the average value of 1 minute frequency departure, ACE10Refer to the interconnected network area control error in 10 minutes
Average value；L10Refer to the control limitation of the absolute value in 10 minutes to ACE average value；CF1 is used to evaluate the AGC of control area
Control the influence to entire interacted system frequency；CF2 refers to the ratio of the every 10 minutes average value of ACE and control limitation.
4. the active fluctuation side of stabilizing of the extra-high voltage interconnection according to claim 1 based on master-slave mode energy storage coordinated control
Method, which is characterized in that the participation factor of each regional power grid BESS in the step 3)It calculates as follows:
。
5. the active fluctuation side of stabilizing of the extra-high voltage interconnection according to claim 1 based on master-slave mode energy storage coordinated control
Method, which is characterized in that participate in factor K jointly in the step 4)BDetermination method are as follows:
1. working as KBi *Less than KBj *, and KBi *When >=0, KBEqual to KBj *, BESSiFor main BESS, BESSjFor from BESS；
2. working as KBj *Less than KBi *, and KBj *When >=0, KBEqual to KBi *, BESSjFor main BESS, BESSiFor from BESS；
3. working as KBi *And KBj *When being equal to 0, controlled using existing AGC to carry out Δ PijRecovery.
6. the active fluctuation side of stabilizing of the extra-high voltage interconnection according to claim 1 based on master-slave mode energy storage coordinated control
Method, which is characterized in that the charge-discharge electric power of regional power grid i and regional power grid j are respectively P in the step 5)BiAnd PBj, PBiWith
PBjSize is identical, and charge and discharge are contrary；
By comparing PBi *And PBj *The size of absolute value, and take wherein lesser value obtain PBiAnd PBjValue, PBi *And PBj *Meter
Calculation method is as follows, works as SoCi< SoCmin, and battery is required further to discharge or SoCi> SoCmax, and battery is required further to fill
When electric,Remaining situationSame mode can be calculatedWherein SoC represents battery storage
The state-of-charge of energy.
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| CN201811424537.5A CN109301845B (en) | 2018-12-11 | 2018-12-11 | Active fluctuation stabilizing method of extra-high voltage tie line based on master-slave type energy storage coordination control |
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