CN109510249A - A kind of distributed energy storage system participation power grid frequency modulation control method and device - Google Patents
A kind of distributed energy storage system participation power grid frequency modulation control method and device Download PDFInfo
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- CN109510249A CN109510249A CN201811495794.8A CN201811495794A CN109510249A CN 109510249 A CN109510249 A CN 109510249A CN 201811495794 A CN201811495794 A CN 201811495794A CN 109510249 A CN109510249 A CN 109510249A
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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
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
This application involves a kind of frequency modulation control strategies of distributed energy storage, distributed energy storage energy storage unit is more relatively to be dispersed, mostly multi-drop arrangement, this patent has formulated a kind of frequency modulation control strategy for the distributed energy storage system of multi-drop arrangement, effectively energy storage unit is grouped according to SOC state, it is compared by extracting mains frequency F and frequency dead band bound, further according to the working condition of comparison result control energy storage unit, improve the utilization efficiency of battery, accomplish that energy-storage system rapidly and accurately responds, the charge and discharge of unnecessary energy storage unit are reduced to the greatest extent, extend the service life of energy storage unit.
Description
Technical field
The application belongs to technical field of energy storage, and in particular to a kind of distributed energy storage equipment participates in the controlling party of power grid frequency modulation
Method.
Background technique
Current problem of environmental pollution and energy crisis it is increasingly serious, the trend that new energy largely uses is irresistible.Such as
The development such as photovoltaic power generation, wind-power electricity generation are swift and violent.But due to geographical and environmental factor, many new energy are dispersed in various regions, and distribution is not
And photovoltaic power generation, wind-power electricity generation can with shine upon with the variation of the environment such as wind speed and make the voltage produced electricl energy and frequency
Corresponding change occurs for rate.A large amount of accesses of these energy also can bring adverse effect to the stability of distribution network system.Tradition
The capacity and response speed of the frequency modulation of power supply have been unable to satisfy the frequency modulation demand of current complexity, this has become serious restriction power grid
One of an important factor for using distributed generation resource.
Lead to largely have the idle of the new energy such as wind-powered electricity generation and photovoltaic for the unstable of current new energy power generation grid-connection.
It will cause the serious wasting of resources in this way.Distributed energy storage technology application be distribution type renewable energy it is grid-connected provide it is important
Technical support.Flat volatility, trace scheduling, peak-frequency regulation etc. can be carried out to it using distributed energy storage technology, make new energy
Power generation can steadily export in controlled range, to reach the safety of the large-scale grid connection of new energy, stability requirement.But
It is that distributed energy storage is because distribution is irregular, and the variety of energy sources being related to is more, stored energy form and energy storage specification disunity, it is distributed
Energy-storage system mostly accesses power grid in a manner of multi-drop arrangement, thinks that coordinated control difficulty is larger.Therefore a kind of point of multi-drop arrangement is developed
The control chirping strategies of cloth energy-storage system are extremely urgent.
Summary of the invention
The technical problem to be solved by the present invention is to solve deficiency in the prior art, to provide a kind of distributed storage
Energy equipment participates in the control method of power grid frequency modulation.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of distributed energy storage system participation power grid frequency modulation control method, comprising the following steps:
S1: subregion is carried out to each energy-accumulating power station in distributed energy storage, each area definition is an energy-storage units, each
There are several energy storage units in energy-storage units；
S2: power P, SOC state S, response time T, existing the charge and discharge times N, battery temperature t of acquisition energy storage unit,
And each energy storage unit is assessed, the calculation formula for assessing score A is,
Wherein SIt is optimalCharging when be the minimum value of energy storage unit in same subregion, electric discharge when be energy storage in same subregion
The maximum value of unit, PMAXFor the maximum value of the power of energy storage unit in same subregion；TMIN、tMINAnd NMINRespectively same point
Response time of energy storage unit in area, existing charge and discharge number and battery temperature minimum value, k is total component selections according to A
Constant；
S3: the maximum preceding n energy storage unit of score A score is chosen；
S4: energy storage machine group is divided into outA, outB, inA according to the SOC state of energy storage unit by the energy storage unit selected
With tetra- groups of inB, outA:SOChighSOC value < SOC of < outAmax, outB:SOCmidSOC value < SOC of < outBhigh, inA:
SOCminSOC value < SOC of < inAlow, inB:SOClowSOC value < SOC of < inBmid, SOCmin、SOCmaxIn respectively same subregion
The minimum value and maximum value in SOC value in all energy storage units, and SOCmin< SOClow< SOCmid< SOChigh< SOCmax；
S5: extracting mains frequency F and frequency dead band bound is compared, and Regulation dead-band bound is set as upper limit fH
=FMark+ Δ f and lower limit fL=FMarkΔ f, FMarkFor power grid standard frequency, Δ f is mains frequency deviation；
S6: if fL≤F≤fH, then energy-storage system is without movement；
If F < fL, by outAAnd outBTwo groups of energy storage units are acted as follows in a case where:
Situation A: Δ P < PbatteryoutA,
Wherein, PbatteryoutAFor energy storage unit group outAProvided active power in this case；
Wherein, KSOCFor energy storage unit state of charge and power conversion proportionality coefficient；For energy storage unit outAIn
The SOC value of i battery；
Situation B:PbatteryoutA<ΔP<(PbatteryoutA+PbatteryoutB),
Wherein, PbatteryoutBFor energy storage unit outBBattery pack in this case provided by active power,
Wherein, SOCBjFor energy storage unit outBIn j-th of battery SOC value,
Situation C:(PbatteryoutA+PbatteryoutB) < Δ P,
As a situation arises A, active power, energy storage unit out only are provided to power grid by energy storage unit outAAIn each electricity
The active power that pond provides is PoutA1:
As a situation arises B, first by energy storage unit outAAnd outBIt contributes simultaneously, provides active power to power grid,
The active power that each battery provides in two groups of battery packs of this stage is equal are as follows:
Work as outBThe average SOC of battery packoutBValue is down to SOCmidWhen, outAThe average SOC of pond groupoutAValue is down to SOChigh,
Energy storage unit outBStop power output, energy storage unit outAContinue to contribute, this stage energy storage unit outAIn having of providing of each battery
Function power are as follows:
As a situation arises C, energy storage unit outAAnd outBSimultaneously with itself maximum power PmaxPower output, to system power supply,
When two groups, itself SOC drops to SOCmidWhen stop power output, by energy storage unit inBContinue to contribute to system, at this time energy storage unit inB
In the active power that provides of each battery are as follows:
M is energy storage unit inBBattery number.
If fH< F, byAAnd inBTwo groups of energy storage units are acted as follows in a case where:
Situation D: Δ P < PbatteryinA,
Wherein, PbatteryinAFor energy storage unit inAThe active power absorbed in this case,
Wherein, KSOCFor energy storage unit state of charge and power conversion proportionality coefficient；For energy storage unit inAIn n-th
The SOC of a battery,
Situation E:PbatteryinA<ΔP<(PbatteryinA+PbatteryinB),
Wherein, PbatteryinBFor energy storage unit inBThe active power absorbed in this case,
Wherein, SOCBmFor energy storage unit outBIn m-th of battery SOC,
Situation F:(PbatteryinA+PbatteryinB) < Δ P,
As a situation arises D, only by energy storage unit inANetwork re-active power is absorbed, each battery is inhaled in energy storage unit inA
The active power of receipts is PinA1:
As a situation arises E, the active power of power grid, this stage energy storage machine are first absorbed simultaneously by energy storage unit inA and inB
The active power that each battery absorbs in group inA are as follows:
As energy storage unit inBAverage SOC value reach SOCmidWhen, energy storage unit inAAverage SOC value reach SOClowWhen,
Energy storage unit inBStop absorbing active power, energy storage unit inAContinue to absorb,
As a situation arises F, energy storage unit inA and inB absorbs the wattful power of power grid simultaneously with itself maximum power Pmax
Rate, when the value of the SOC of two groups of energy storage units all reaches SOCmidWhen stop absorb, by energy storage unit outBContinue to absorb.It stores up at this time
The active power that each battery absorbs in energy unit outB are as follows:
Preferably, distributed energy storage system of the invention participates in power grid frequency modulation control method, after S6 step, will extract electricity
Net frequency F and frequency dead band bound are compared, if fL≤F≤fHThen frequency modulation terminates, and continues to implement to mains frequency F
Monitoring；
If F < fLThen utilize energy storage unit inBThe active power for absorbing power grid, until fL≤F≤fH；
If fH< then utilize energy storage unit outBIt contributes, until fL≤F≤fH。
Preferably, distributed energy storage system of the invention participates in power grid frequency modulation control method, to each in distributed energy storage
When a energy-accumulating power station carries out subregion, the same type of energy-accumulating power station of areal is divided into an area.
Preferably, distributed energy storage system of the invention participates in power grid frequency modulation control method, SOClow=0.2-0.3,
SOCmid=0.45-0.55, SOChigh=0.7-0.8.
Preferably, distributed energy storage system of the invention participates in power grid frequency modulation control method, in S3 step, according to following public affairs
Formula solves the value of n, selects the energy storage unit of the assessment highest n of score A,
Pinitial> Δ P,
Δ P=Δ fK,
Pinitial=P1+P2+......+Pn,
0≤|Pn|≤Pnmax,
Wherein, PinitialFor energy storage power output initial value, K is energy-storage system coefficient of frequency modulation, PnFor the volume of n-th of energy storage unit
Determine power, PnmaxFor the maximum power of n-th of energy storage unit.
Also a kind of distributed energy storage system of the present invention participates in power grid frequency modulation control device, comprising:
Division module: for carrying out subregion to each energy-accumulating power station in distributed energy storage, each area definition is a storage
Can unit, have several energy storage units in each energy-storage units；
Grading module: for acquire the power P of energy storage unit, SOC state S, response time T, existing charge and discharge times N,
Battery temperature t, and assessing each energy storage unit, the calculation formula for assessing score A be,
Wherein SIt is optimalCharging when be the minimum value of energy storage unit in same subregion, electric discharge when be energy storage in same subregion
The maximum value of unit, PMAXFor the maximum value of the power of energy storage unit in same subregion；TMIN、tMINAnd NMINRespectively same point
Response time of energy storage unit in area, existing charge and discharge number and battery temperature minimum value, k is total component selections according to A
Constant；
Screening module: for choosing the maximum preceding n energy storage unit of score A score；
Grouping module: energy storage machine group is divided by the energy storage unit for will select according to the SOC state of energy storage unit
Tetra- groups of outA, outB, inA and inB, outA:SOChighSOC value < SOC of < outAmax, outB:SOCmidThe SOC value of < outB <
SOChigh, inA:SOCminSOC value < SOC of < inAlow, inB:SOClowSOC value < SOC of < inBmid, SOCmin、SOCmaxRespectively
For the minimum value and maximum value in the SOC value in energy storage units all in same subregion, and SOCmin< SOClow< SOCmid<
SOChigh< SOCmax；
Mains frequency comparison module: it is compared for extracting mains frequency F and frequency dead band bound, on Regulation dead-band
Lower limit is set as upper limit fH=FMark+ Δ f and lower limit fL=FMarkΔ f, FMarkFor power grid standard frequency, Δ f is mains frequency deviation；
Management of charging and discharging module: for executing following movement according to mains frequency comparison module comparison result,
If fL≤F≤fH, then energy-storage system is without movement；
If F < fL, by outAAnd outBTwo groups of energy storage units are acted as follows in a case where:
Situation A: Δ P < PbatteryoutA,
Wherein, PbatteryoutAFor energy storage unit group outAProvided active power in this case；
Wherein, KSOCFor energy storage unit state of charge and power conversion proportionality coefficient；For energy storage unit outAIn
The SOC value of i battery；
Situation B:PbatteryoutA<ΔP<(PbatteryoutA+PbatteryoutB),
Wherein, PbatteryoutBFor energy storage unit outBBattery pack in this case provided by active power,
Wherein, SOCBjFor energy storage unit outBIn j-th of battery SOC value,
Situation C:(PbatteryoutA+PbatteryoutB) < Δ P,
As a situation arises A, only by energy storage unit outAActive power is provided to power grid,
As a situation arises B, first by energy storage unit outAAnd outBIt contributes simultaneously, provides active power to power grid, work as outB
The average SOC of battery packoutBValue is down to SOCmidWhen, outAThe average SOC of pond groupoutAValue is down to SOChigh, energy storage unit outBStop
Only contribute, energy storage unit outAContinue to contribute,
As a situation arises C, energy storage unit outAAnd outBSimultaneously with itself maximum power PmaxPower output, to system power supply,
When two groups, itself SOC drops to SOCmidWhen stop power output, by energy storage unit inBContinue to contribute to system,
If fH< F, byAAnd inBTwo groups of energy storage units are acted as follows in a case where:
Situation D: Δ P < PbatteryinA,
Wherein, PbatteryinAFor energy storage unit inAThe active power absorbed in this case,
Wherein, KSOCFor energy storage unit state of charge and power conversion proportionality coefficient；For energy storage unit inAIn n-th
The SOC of a battery,
Situation E:PbatteryinA<ΔP<(PbatteryinA+PbatteryinB),
Wherein, PbatteryinBFor energy storage unit inBThe active power absorbed in this case,
Wherein, SOCBmFor energy storage unit outBIn m-th of battery SOC,
Situation F:(PbatteryinA+PbatteryinB) < Δ P,
As a situation arises D, only by energy storage unit inANetwork re-active power is absorbed,
As a situation arises E, first by energy storage unit inAAnd inBThe active power for absorbing power grid simultaneously, as energy storage unit inB
Average SOC value reach SOCmidWhen, energy storage unit inAAverage SOC value reach SOClowWhen, energy storage unit inBStopping absorbing has
Function power, energy storage unit inAContinue to absorb,
As a situation arises F, energy storage unit inAAnd inBSimultaneously with itself maximum power PmaxThe active power of power grid is absorbed,
When the value of the SOC of two groups of energy storage units all reaches SOCmidWhen stop absorb, by energy storage unit outBContinue to absorb.
Preferably, distributed energy storage system of the invention participates in power grid frequency modulation control device, further includes frequency modulation frequency modulation mould
Block will extract mains frequency F and frequency dead band bound be compared, if fL≤F≤fHThen frequency modulation terminates, to mains frequency F after
It is continuous to carry out implementing monitoring；
If F < fLThen utilize energy storage unit inBThe active power for absorbing power grid, until fL≤F≤fH；
If fH< then utilize energy storage unit outBIt contributes, until fL≤F≤fH。
Preferably, distributed energy storage system of the invention participates in power grid frequency modulation control device, in the division module to point
When each energy-accumulating power station in cloth energy storage carries out subregion, the same type of energy-accumulating power station of areal is divided into an area.
Preferably, distributed energy storage system of the invention participates in power grid frequency modulation control device, SOC in the grouping modulelow
=0.2-0.3, SOCmid=0.45-0.55, SOChigh=0.7-0.8.
Preferably, distributed energy storage system of the invention participates in power grid frequency modulation control device, in the screening module, according to
Following formula solves the value of n, selects the energy storage unit of the assessment highest n of score A,
Pinitial> Δ P,
Δ P=Δ fK,
Pinitial=P1+P2+......+Pn,
0≤|Pn|≤Pnmax,
Wherein, PinitialFor energy storage power output initial value, K is energy-storage system coefficient of frequency modulation, PnFor the volume of n-th of energy storage unit
Determine power, PnmaxFor the maximum power of n-th of energy storage unit.
The beneficial effects of the present invention are:
Invention be a kind of distributed energy storage frequency modulation control strategy, distributed energy storage energy storage unit it is more relatively point
It dissipates, mostly multi-drop arrangement, this patent has formulated a kind of frequency modulation control strategy for the distributed energy storage system of multi-drop arrangement, effectively
Energy storage unit is grouped according to SOC state, improve the utilization efficiency of battery, accomplish that energy-storage system is rapidly and accurately rung
It answers, has reduced the charge and discharge of unnecessary energy storage unit to the greatest extent.Extend the service life of energy storage unit.This patent devises two
Secondary frequency modulation link, improves the stability of system.
Detailed description of the invention
The technical solution of the application is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 is that the distributed energy storage system of the embodiment of the present application participates in the flow chart of power grid frequency modulation control method；
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
It is described in detail the technical solution of the application below with reference to the accompanying drawings and in conjunction with the embodiments.
Embodiment
The present embodiment provides a kind of distributed energy storage systems to participate in power grid frequency modulation control method,
The following steps are included:
S1: subregion is carried out to each energy-accumulating power station in distributed energy storage, each area definition is an energy-storage units, each
There are several energy storage units in energy-storage units；
S2: power P, SOC state S, response time T, existing the charge and discharge times N, battery temperature t of acquisition energy storage unit,
And each energy storage unit is assessed, the calculation formula for assessing score A is,
Wherein SIt is optimalCharging when be the minimum value of energy storage unit in same subregion, electric discharge when be energy storage in same subregion
The maximum value of unit, PMAXFor the maximum value of the power of energy storage unit in same subregion；TMIN、tMINAnd NMINRespectively same point
Response time of energy storage unit in area, existing charge and discharge number and battery temperature minimum value, k is total component selections according to A
Constant, for example can comprehensively consider, it is desirable to when the total score of A is 1 point or 100, total score can be determined by selection k；
S3: the maximum preceding n energy storage unit of score A score is chosen；
S4: energy storage machine group is divided into outA, outB, inA according to the SOC state of energy storage unit by the energy storage unit selected
With tetra- groups of inB, outA:SOChighSOC value < SOC of < outAmax, outB:SOCmidSOC value < SOC of < outBhigh, inA:
SOCminSOC value < SOC of < inAlow, inB:SOClowSOC value < SOC of < inBmid, SOCmin、SOCmaxIn respectively same subregion
The minimum value and maximum value in SOC value in all energy storage units, and SOCmin< SOClow< SOCmid< SOChigh< SOCmax；
S5: extracting mains frequency F and frequency dead band bound is compared, and Regulation dead-band bound is set as upper limit fH
=FMark+ Δ f and lower limit fL=FMarkΔ f, FMarkFor power grid standard frequency, Δ f is mains frequency deviation；
S6: if fL≤F≤fH, then energy-storage system is without movement；
If F < fL, by outAAnd outBTwo groups of energy storage units are acted as follows in a case where:
Situation A: Δ P < PbatteryoutA,
Wherein, PbatteryoutAFor energy storage unit group outAProvided active power in this case；
Wherein, KSOCFor energy storage unit state of charge and power conversion proportionality coefficient；For energy storage unit outAIn
The SOC value of i battery；
Situation B:PbatteryoutA<ΔP<(PbatteryoutA+PbatteryoutB),
Wherein, PbatteryoutBFor energy storage unit outBBattery pack in this case provided by active power,
Wherein,For energy storage unit outBIn j-th of battery SOC value,
Situation C:(PbatteryoutA+PbatteryoutB) < Δ P,
As a situation arises A, only by energy storage unit outAActive power is provided to power grid,
As a situation arises B, first by energy storage unit outAAnd outBIt contributes simultaneously, provides active power to power grid, work as outB
The average SOC of battery packoutBValue is down to SOCmidWhen, outAThe average SOC of pond groupoutAValue is down to SOChigh, energy storage unit outBStop
Only contribute, energy storage unit outAContinue to contribute,
As a situation arises C, energy storage unit outAAnd outBSimultaneously with itself maximum power PmaxPower output, to system power supply,
When two groups, itself SOC drops to SOCmidWhen stop power output, by energy storage unit inBContinue to contribute to system,
If fH< F, byAAnd inBTwo groups of energy storage units are acted as follows in a case where:
Situation D: Δ P < PbatteryinA,
Wherein, PbatteryinAFor energy storage unit inAThe active power absorbed in this case,
Wherein, KSOCFor energy storage unit state of charge and power conversion proportionality coefficient；For energy storage unit inAIn n-th
The SOC of a battery,
Situation E:PbatteryinA<ΔP<(PbatteryinA+PbatteryinB),
Wherein, PbatteryinBFor energy storage unit inBThe active power absorbed in this case,
Wherein, SOCBmFor energy storage unit outBIn m-th of battery SOC,
Situation F:(PbatteryinA+PbatteryinB) < Δ P,
As a situation arises D, only by energy storage unit inANetwork re-active power is absorbed,
As a situation arises E, first by energy storage unit inAAnd inBThe active power for absorbing power grid simultaneously, as energy storage unit inB
Average SOC value reach SOCmidWhen, energy storage unit inAAverage SOC value reach SOClowWhen, energy storage unit inBStopping absorbing has
Function power, energy storage unit inAContinue to absorb,
As a situation arises F, energy storage unit inAAnd inBSimultaneously with itself maximum power PmaxThe active power of power grid is absorbed,
When the value of the SOC of two groups of energy storage units all reaches SOCmidWhen stop absorb, by energy storage unit outBContinue to absorb.
Preferably, after S6 step, mains frequency F will be extracted and frequency dead band bound is compared, if fL≤F≤fH
Then frequency modulation terminates, and continues implementing monitoring to mains frequency F；
If F < fLThen utilize energy storage unit inBThe active power for absorbing power grid, until fL≤F≤fH；
If fH< then utilize energy storage unit outBIt contributes, until fL≤F≤fH。
Preferably, when carrying out subregion to each energy-accumulating power station in distributed energy storage, by the same type of of areal
Energy-accumulating power station is divided into an area.
Preferably, SOClow=0.2-0.3, SOCmid=0.45-0.55, SOChigh=0.7-0.8.
Preferably, in S3 step, the value of n is solved according to the following formula, selects the energy storage unit of the assessment highest n of score A,
Pinitial> Δ P,
Δ P=Δ fK,
Pinitial=P1+P2+......+Pn,
0≤|Pn|≤Pnmax,
Wherein, PinitialFor energy storage power output initial value, K is energy-storage system coefficient of frequency modulation, PnFor the volume of n-th of energy storage unit
Determine power, PnmaxFor the maximum power of n-th of energy storage unit.
The present embodiment also provides a kind of distributed energy storage system participation power grid frequency modulation control device, comprising:
Division module: for carrying out subregion to each energy-accumulating power station in distributed energy storage, each area definition is a storage
Can unit, have several energy storage units in each energy-storage units；
Grading module: for acquire the power P of energy storage unit, SOC state S, response time T, existing charge and discharge times N,
Battery temperature t, and assessing each energy storage unit, the calculation formula for assessing score A be,
Wherein SIt is optimalCharging when be the minimum value of energy storage unit in same subregion, electric discharge when be energy storage in same subregion
The maximum value of unit, PMAXFor the maximum value of the power of energy storage unit in same subregion；TMIN、tMINAnd NMINRespectively same point
Response time of energy storage unit in area, existing charge and discharge number and battery temperature minimum value, k is total component selections according to A
Constant；
Screening module: for choosing the maximum preceding n energy storage unit of score A score；
Grouping module: energy storage machine group is divided by the energy storage unit for will select according to the SOC state of energy storage unit
Tetra- groups of outA, outB, inA and inB, outA:SOChighSOC value < SOC of < outAmax, outB:SOCmidThe SOC value of < outB <
SOChigh, inA:SOCminSOC value < SOC of < inAlow, inB:SOClowSOC value < SOC of < inBmid, SOCmin、SOCmaxRespectively
For the minimum value and maximum value in the SOC value in energy storage units all in same subregion, and SOCmin< SOClow< SOCmid<
SOChigh< SOCmax；
Mains frequency comparison module: it is compared for extracting mains frequency F and frequency dead band bound, on Regulation dead-band
Lower limit is set as upper limit fH=FMark+ Δ f and lower limit fL=FMarkΔ f, FMarkFor power grid standard frequency, Δ f is mains frequency deviation；
Management of charging and discharging module: for executing following movement according to mains frequency comparison module comparison result,
If fL≤F≤fH, then energy-storage system is without movement；
If F < fL, by outAAnd outBTwo groups of energy storage units are acted as follows in a case where:
Situation A: Δ P < PbatteryoutA,
Wherein, PbatteryoutAFor energy storage unit group outAProvided active power in this case；
Wherein, KSOCFor energy storage unit state of charge and power conversion proportionality coefficient；For energy storage unit outAIn
The SOC value of i battery；
Situation B:PbatteryoutA<ΔP<(PbatteryoutA+PbatteryoutB),
Wherein, PbatteryoutBFor energy storage unit outBBattery pack in this case provided by active power,
Wherein, SOCBjFor energy storage unit outBIn j-th of battery SOC value,
Situation C:(PbatteryoutA+PbatteryoutB) < Δ P,
As a situation arises A, only by energy storage unit outAActive power is provided to power grid,
As a situation arises B, first by energy storage unit outAAnd outBIt contributes simultaneously, provides active power to power grid, work as outB
The average SOC of battery packoutBValue is down to SOCmidWhen, outAThe average SOC of pond groupoutAValue is down to SOChigh, energy storage unit outBStop
Only contribute, energy storage unit outAContinue to contribute,
As a situation arises C, energy storage unit outAAnd outBSimultaneously with itself maximum power PmaxPower output, to system power supply,
When two groups, itself SOC drops to SOCmidWhen stop power output, by energy storage unit inBContinue to contribute to system,
If fH< F, byAAnd inBTwo groups of energy storage units are acted as follows in a case where:
Situation D: Δ P < PbatteryinA,
Wherein, PbatteryinAFor energy storage unit inAThe active power absorbed in this case,
Wherein, KSOCFor energy storage unit state of charge and power conversion proportionality coefficient；For energy storage unit inAIn n-th
The SOC of a battery,
Situation E:PbatteryinA<ΔP<(PbatteryinA+PbatteryinB),
Wherein, PbatteryinBFor energy storage unit inBThe active power absorbed in this case,
Wherein, SOCBmFor energy storage unit outBIn m-th of battery SOC,
Situation F:(PbatteryinA+PbatteryinB) < Δ P,
As a situation arises D, only by energy storage unit inANetwork re-active power is absorbed,
As a situation arises E, first by energy storage unit inAAnd inBThe active power for absorbing power grid simultaneously, as energy storage unit inB
Average SOC value reach SOCmidWhen, energy storage unit inAAverage SOC value reach SOClowWhen, energy storage unit inBStopping absorbing has
Function power, energy storage unit inAContinue to absorb,
As a situation arises F, energy storage unit inAAnd inBSimultaneously with itself maximum power PmaxThe active power of power grid is absorbed,
When the value of the SOC of two groups of energy storage units all reaches SOCmidWhen stop absorb, by energy storage unit outBContinue to absorb.
Preferably, further include frequency modulation frequency modulation module, mains frequency F will be extracted and frequency dead band bound is compared, if
fL≤F≤fHThen frequency modulation terminates, and continues implementing monitoring to mains frequency F；
If F < fLThen utilize energy storage unit inBThe active power for absorbing power grid, until fL≤F≤fH；
If fH< then utilize energy storage unit outBIt contributes, until fL≤F≤fH。
It preferably, will samely when carrying out subregion to each energy-accumulating power station in distributed energy storage in the division module
The same type of energy-accumulating power station in area is divided into an area.
Preferably, SOC in the grouping modulelow=0.2-0.3, SOCmid=0.45-0.55, SOChigh=0.7-0.8.
Preferably, in the screening module, the value of n is solved according to the following formula, selects the storage of the assessment highest n of score A
Energy unit,
Pinitial> Δ P,
Δ P=Δ fK,
Pinitial=P1+P2+......+Pn,
0≤|Pn|≤Pnmax,
Wherein, PinitialFor energy storage power output initial value, K is energy-storage system coefficient of frequency modulation, PnFor the volume of n-th of energy storage unit
Determine power, PnmaxFor the maximum power of n-th of energy storage unit.
Provided in this embodiment is a kind of frequency modulation control strategy of distributed energy storage, distributed energy storage energy storage unit it is more compared with
Dispersion, mostly multi-drop arrangement, this patent have been formulated a kind of frequency modulation control strategy for the distributed energy storage system of multi-drop arrangement, have been had
Energy storage unit is grouped by effect according to SOC state, is compared by extracting mains frequency F and frequency dead band bound,
Further according to the working condition of comparison result control energy storage unit, the utilization efficiency of battery is improved, accomplishes energy-storage system quick and precisely
Ground response, has reduced the charge and discharge of unnecessary energy storage unit to the greatest extent, has extended the service life of energy storage unit.As further
It improves, repayment of principal Patent design frequency modulation frequency modulation link improves the stability of system.
It is enlightenment with the above-mentioned desirable embodiment according to the application, through the above description, relevant staff is complete
Full various changes and amendments can be carried out in the range of without departing from this item application technical idea.The technology of this item application
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (10)
1. a kind of distributed energy storage system participates in power grid frequency modulation control method, which comprises the following steps:
S1: subregion is carried out to each energy-accumulating power station in distributed energy storage, each area definition is an energy-storage units, each energy storage
There are several energy storage units in unit；
S2: power P, SOC state S, response time T, existing the charge and discharge times N, battery temperature t of acquisition energy storage unit, and it is right
Each energy storage unit is assessed, and the calculation formula for assessing score A is,
Wherein SIt is optimalCharging when be the minimum value of energy storage unit in same subregion, electric discharge when be energy storage unit in same subregion
Maximum value, PMAXFor the maximum value of the power of energy storage unit in same subregion；TMIN、tMINAnd NMINIn respectively same subregion
The response time of energy storage unit, the minimum value for having charge and discharge number and battery temperature, k are the constant according to total component selections of A；
S3: the maximum preceding n energy storage unit of score A score is chosen；
S4: by the energy storage unit selected according to the SOC state of energy storage unit by energy storage machine group be divided into outA, outB, inA and
Tetra- groups of inB, outA:SOChighSOC value < SOC of < outAmax, outB:SOCmidSOC value < SOC of < outBhigh, inA:SOCmin<
SOC value < SOC of inAlow, inB:SOClowSOC value < SOC of < inBmid, SOCmin、SOCmaxAll storages in respectively same subregion
The minimum value and maximum value in SOC value in energy unit, and SOCmin< SOClow< SOCmid< SOChigh< SOCmax；
S5: extracting mains frequency F and frequency dead band bound is compared, and Regulation dead-band bound is set as upper limit fH=FMark+
Δ f and lower limit fL=FMarkΔ f, FMarkFor power grid standard frequency, Δ f is mains frequency deviation；
S6: if fL≤F≤fH, then energy-storage system is without movement；
If F < fL, by outAAnd outBTwo groups of energy storage units are acted as follows in a case where:
Situation A: Δ P < PbatteryoutA,
Wherein, PbatteryoutAFor energy storage unit group outAProvided active power in this case；
Wherein, KSOCFor energy storage unit state of charge and power conversion proportionality coefficient；For energy storage unit outAIn i-th electricity
The SOC value in pond；
Situation B:PbatteryoutA<ΔP<(PbatteryoutA+PbatteryoutB),
Wherein, PbatteryoutBFor energy storage unit outBBattery pack in this case provided by active power,
Wherein, SOCBjFor energy storage unit outBIn j-th of battery SOC value,
Situation C:(PbatteryoutA+PbatteryoutB) < Δ P,
As a situation arises A, only by energy storage unit outAActive power is provided to power grid,
As a situation arises B, first by energy storage unit outAAnd outBIt contributes simultaneously, provides active power to power grid, work as outBBattery
The average SOC of groupoutBValue is down to SOCmidWhen, outAThe average SOC of pond groupoutAValue is down to SOChigh, energy storage unit outBStop
Power, energy storage unit outAContinue to contribute,
As a situation arises C, energy storage unit outAAnd outBSimultaneously with itself maximum power PmaxPower output, to system power supply, when two
Itself SOC of group drops to SOCmidWhen stop power output, by energy storage unit inBContinue to contribute to system,
If fH< F, byAAnd inBTwo groups of energy storage units are acted as follows in a case where:
Situation D: Δ P < PbatteryinA,
Wherein, PbatteryinAFor energy storage unit inAThe active power absorbed in this case,
Wherein, KSOCFor energy storage unit state of charge and power conversion proportionality coefficient；For energy storage unit inAIn n-th electricity
The SOC in pond,
Situation E:PbatteryinA<ΔP<(PbatteryinA+PbatteryinB),
Wherein, PbatteryinBFor energy storage unit inBThe active power absorbed in this case,
Wherein, SOCBmFor energy storage unit outBIn m-th of battery SOC,
Situation F:(PbatteryinA+PbatteryinB) < Δ P,
As a situation arises D, only by energy storage unit inANetwork re-active power is absorbed,
As a situation arises E, first by energy storage unit inAAnd inBThe active power for absorbing power grid simultaneously, as energy storage unit inBIt is flat
Equal SOC value reaches SOCmidWhen, energy storage unit inAAverage SOC value reach SOClowWhen, energy storage unit inBStop absorbing wattful power
Rate, energy storage unit inAContinue to absorb,
As a situation arises F, energy storage unit inAAnd inBSimultaneously with itself maximum power PmaxThe active power for absorbing power grid, when two
The value of the SOC of group energy storage unit all reaches SOCmidWhen stop absorb, by energy storage unit outBContinue to absorb.
2. distributed energy storage system according to claim 1 participates in power grid frequency modulation control method, which is characterized in that S6 step
After, mains frequency F will be extracted and frequency dead band bound is compared, if fL≤F≤fHThen frequency modulation terminates, to mains frequency F
Continue implementing monitoring；
If F < fLThen utilize energy storage unit inBThe active power for absorbing power grid, until fL≤F≤fH；
If fH< then utilize energy storage unit outBIt contributes, until fL≤F≤fH。
3. distributed energy storage system according to claim 1 or 2 participates in power grid frequency modulation control method, which is characterized in that right
When each energy-accumulating power station in distributed energy storage carries out subregion, the same type of energy-accumulating power station of areal is divided into one
Area.
4. distributed energy storage system according to claim 1-3 participates in power grid frequency modulation control method, feature exists
In SOClow=0.2-0.3, SOCmid=0.45-0.55, SOChigh=0.7-0.8.
5. distributed energy storage system according to claim 1-4 participates in power grid frequency modulation control method, feature exists
In, in S3 step, the value of n is solved according to the following formula, selects the energy storage unit of the assessment highest n of score A,
Pinitial> Δ P,
Δ P=Δ fK,
Pinitial=P1+P2+......+Pn,
0≤|Pn|≤Pnmax,
Wherein, PinitialFor energy storage power output initial value, K is energy-storage system coefficient of frequency modulation, PnFor the specified function of n-th of energy storage unit
Rate, PnmaxFor the maximum power of n-th of energy storage unit.
6. a kind of distributed energy storage system participates in power grid frequency modulation control device characterized by comprising
Division module: for carrying out subregion to each energy-accumulating power station in distributed energy storage, each area definition is an energy storage list
Member has several energy storage units in each energy-storage units；
Grading module: for acquiring power P, SOC state S, response time T, existing the charge and discharge times N, battery of energy storage unit
Temperature t, and assessing each energy storage unit, the calculation formula for assessing score A be,
Wherein SIt is optimalCharging when be the minimum value of energy storage unit in same subregion, electric discharge when be energy storage unit in same subregion
Maximum value, PMAXFor the maximum value of the power of energy storage unit in same subregion；TMIN、tMINAnd NMINIn respectively same subregion
The response time of energy storage unit, the minimum value for having charge and discharge number and battery temperature, k are the constant according to total component selections of A；
Screening module: for choosing the maximum preceding n energy storage unit of score A score；
Grouping module: energy storage unit for will select according to the SOC state of energy storage unit by energy storage machine group be divided into outA,
Tetra- groups of outB, inA and inB, outA:SOChighSOC value < SOC of < outAmax, outB:SOCmidSOC value < SOC of < outBhigh、
InA:SOCminSOC value < SOC of < inAlow, inB:SOClowSOC value < SOC of < inBmid, SOCmin、SOCmaxRespectively same point
The minimum value and maximum value in SOC value in area in all energy storage units, and SOCmin< SOClow< SOCmid< SOChigh<
SOCmax；
Mains frequency comparison module: it is compared for extracting mains frequency F and frequency dead band bound, Regulation dead-band bound
Be set as upper limit fH=FMark+ Δ f and lower limit fL=FMarkΔ f, FMarkFor power grid standard frequency, Δ f is mains frequency deviation；
Management of charging and discharging module: for executing following movement according to mains frequency comparison module comparison result,
If fL≤F≤fH, then energy-storage system is without movement；
If F < fL, by outAAnd outBTwo groups of energy storage units are acted as follows in a case where:
Situation A: Δ P < PbatteryoutA,
Wherein, PbatteryoutAFor energy storage unit group outAProvided active power in this case；
Wherein, KSOCFor energy storage unit state of charge and power conversion proportionality coefficient；For energy storage unit outAIn i-th electricity
The SOC value in pond；
Situation B:PbatteryoutA<ΔP<(PbatteryoutA+PbatteryoutB),
Wherein, PbatteryoutBFor energy storage unit outBBattery pack in this case provided by active power,
Wherein, SOCBjFor energy storage unit outBIn j-th of battery SOC value,
Situation C:(PbatteryoutA+PbatteryoutB) < Δ P,
As a situation arises A, only by energy storage unit outAActive power is provided to power grid,
As a situation arises B, first by energy storage unit outAAnd outBIt contributes simultaneously, provides active power to power grid, work as outBBattery
The average SOC of groupoutBValue is down to SOCmidWhen, outAThe average SOC of pond groupoutAValue is down to SOChigh, energy storage unit outBStop
Power, energy storage unit outAContinue to contribute,
As a situation arises C, energy storage unit outAAnd outBSimultaneously with itself maximum power PmaxPower output, to system power supply, when two
Itself SOC of group drops to SOCmidWhen stop power output, by energy storage unit inBContinue to contribute to system,
If fH< F, byAAnd inBTwo groups of energy storage units are acted as follows in a case where:
Situation D: Δ P < PbatteryinA,
Wherein, PbatteryinAFor energy storage unit inAThe active power absorbed in this case,
Wherein, KSOCFor energy storage unit state of charge and power conversion proportionality coefficient；For energy storage unit inAIn n-th electricity
The SOC in pond,
Situation E:PbatteryinA<ΔP<(PbatteryinA+PbatteryinB),
Wherein, PbatteryinBFor energy storage unit inBThe active power absorbed in this case,
Wherein, SOCBmFor energy storage unit outBIn m-th of battery SOC,
Situation F:(PbatteryinA+PbatteryinB) < Δ P,
As a situation arises D, only by energy storage unit inANetwork re-active power is absorbed,
As a situation arises E, first by energy storage unit inAAnd inBThe active power for absorbing power grid simultaneously, as energy storage unit inBIt is flat
Equal SOC value reaches SOCmidWhen, energy storage unit inAAverage SOC value reach SOClowWhen, energy storage unit inBStop absorbing wattful power
Rate, energy storage unit inAContinue to absorb,
As a situation arises F, energy storage unit inAAnd inBSimultaneously with itself maximum power PmaxThe active power for absorbing power grid, when two
The value of the SOC of group energy storage unit all reaches SOCmidWhen stop absorb, by energy storage unit outBContinue to absorb.
7. distributed energy storage system according to claim 6 participates in power grid frequency modulation control device, which is characterized in that also wrap
It includes, frequency modulation frequency modulation module, mains frequency F will be extracted and frequency dead band bound is compared, if fL≤F≤fHThen frequency modulation terminates,
Implementing monitoring is continued to mains frequency F；
If F < fLThen utilize energy storage unit inBThe active power for absorbing power grid, until fL≤F≤fH；
If fH< then utilize energy storage unit outBIt contributes, until fL≤F≤fH。
8. distributed energy storage system according to claim 6 or 7 participates in power grid frequency modulation control device, which is characterized in that institute
When stating in division module to each energy-accumulating power station progress subregion in distributed energy storage, by the same type of energy storage of areal
Power station is divided into an area.
9. participating in power grid frequency modulation control device according to the described in any item distributed energy storage systems of claim 6-8, feature exists
In SOC in the grouping modulelow=0.2-0.3, SOCmid=0.45-0.55, SOChigh=0.7-0.8.
10. participating in power grid frequency modulation control device according to the described in any item distributed energy storage systems of claim 6-9, feature exists
In, in the screening module, the value of n is solved according to the following formula, selects the energy storage unit of the assessment highest n of score A,
Pinitial> Δ P,
Δ P=Δ fK,
Pinitial=P1+P2+......+Pn,
0≤|Pn|≤Pnmax,
Wherein, PinitialFor energy storage power output initial value, K is energy-storage system coefficient of frequency modulation, PnFor the specified function of n-th of energy storage unit
Rate, PnmaxFor the maximum power of n-th of energy storage unit.
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| WO2017062911A1 (en) * | 2015-10-08 | 2017-04-13 | Johnson Controls Technology Company | Electrical energy storage system with variable state-of-charge frequency response optimization |
| CN107681675A (en) * | 2017-09-27 | 2018-02-09 | 赫普科技发展（北京）有限公司 | Block chain electricity transaction peak-frequency regulation system based on distributed electric power storage facility |
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| WO2017062911A1 (en) * | 2015-10-08 | 2017-04-13 | Johnson Controls Technology Company | Electrical energy storage system with variable state-of-charge frequency response optimization |
| CN107681675A (en) * | 2017-09-27 | 2018-02-09 | 赫普科技发展（北京）有限公司 | Block chain electricity transaction peak-frequency regulation system based on distributed electric power storage facility |
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