CN107046290A - A kind of polynary energy storage fusion method for improving regional power grid energy utilization rate - Google Patents
A kind of polynary energy storage fusion method for improving regional power grid energy utilization rate Download PDFInfo
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- CN107046290A CN107046290A CN201710161429.2A CN201710161429A CN107046290A CN 107046290 A CN107046290 A CN 107046290A CN 201710161429 A CN201710161429 A CN 201710161429A CN 107046290 A CN107046290 A CN 107046290A
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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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- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of polynary energy storage fusion method for improving regional power grid energy utilization rate, lithium battery, lead-acid accumulator, ultracapacitor, all-vanadium flow battery energy-storage units are merged applied to regional power grid system by this method, using regional power grid power prediction, energy-storage battery electricity, energy-storage battery discharge and recharge number of times as constraints, for the polynary energy-storage system configuration provides optimal policy of regional power grid system, discharge and recharge running status is strategically controlled, to improve the energy utilization rate of regional power grid system.Polynary in the regional power grid system access energy-storage units of the present invention, can effective inhibition zone network system power swing, it is to avoid regenerative resource it is abundant it is regional occur abandoning light wind-abandoning phenomenon in unbalanced power, the energy utilization rate of regional power grid system can be effectively improved.
Description
Technical field
The present invention relates to regional power grid systems technology field, regional power grid energy profit is improved more specifically to one kind
With the polynary energy storage fusion method of rate.
Background technology
With policy support and technological progress, renewable energy power generation, particularly wind generating technology and wind-power electricity generation skill
Art, is developed rapidly, and regional power grid is the important form of renewable energy utilization.Due to containing in regional power grid by meteorology
Factor influence has an intermittent, stochastic volatility renewable energy power generation, and regional power grid is incorporated into the power networks or deposited during isolated power grid
In power swing problem.Regional power grid stable operation depends on the balance control of energy, and energy storage technology is to realize that the energy is put down
Weighing apparatus, it is ensured that the important means of regional power grid stable operation.The present invention in regional power grid by accessing polynary energy storage, with inhibition zone
Domain grid power fluctuation, it is to avoid the abundant area of regenerative resource occurs abandoning light wind-abandoning phenomenon in unbalanced power, can effectively carry
High regional power grid energy utilization rate.
The content of the invention
The technical problem to be solved in the present invention is to melt there is provided a kind of polynary energy storage for improving regional power grid energy utilization rate
Conjunction method.
The technical solution adopted for the present invention to solve the technical problems is：Construction is a kind of to improve regional power grid energy utilization rate
Polynary energy storage fusion method, the regional power grid system include polynary energy-storage system, regional power grid energy storage controller and with institute
The photovoltaic panel group and wind-driven generator of polynary energy-storage system connection are stated, the polynary energy-storage system includes multigroup by lithium battery, lead
The energy-storage units that acid accumulator, ultracapacitor, all-vanadium flow battery are separately constituted, every group of energy-storage units are all become by DC/DC
Change unit and be connected to regional power grid dc bus, methods described includes：
Demand power P of the polynary energy-storage system to regional power grid systemtotalIt is predicted control；
The regional power grid energy storage controller records every group of lithium battery energy storage battery unit, lead-acid accumulator energy-storage units, Quan Fan
The charging and discharging state of flow battery energy storage unit, control battery energy storage unit do not allow before not fully charged electric discharge and
Electric discharge does not allow charging when being not reaching to permission depth of discharge；
Discharge and recharge number of times of the regional power grid energy storage controller record per Battery pack energy-storage units, controls lithium battery energy storage battery
Unit, lead-acid accumulator energy-storage units, the discharge and recharge number of times ratio of all-vanadium flow battery energy-storage units are 30:5:130, lithium battery
The maximum discharge and recharge number of times of energy-storage units is 3000 times, and the maximum discharge and recharge number of times of lead-acid accumulator energy-storage units is 500 times, entirely
The maximum discharge and recharge number of times of vanadium redox flow battery energy storage unit is 13000 times；
If the demand power P of the regional power grid systemtotalLess than zero, | ptotal| less than ultracapacitor energy storage list
First residual capacity correspondence peak power output valueWhen, then first discharge ultracapacitor energy storage unit electricity；| ptotal| it is big
InAnd less than battery energy storage unit residual capacity correspondence peak power outputWithDuring sum, then discharge super
Capacitor energy-storage units and the electricity of battery energy storage unit storage；If | ptotal| it is more thanWithSum, then discharge super
Capacitor energy-storage units and the electricity of battery energy storage unit storage, and connect power network, power network is by the difference of polynary energy-storage system
Electricity input area network system.
In such scheme, the demand power P of the polynary energy-storage system PREDICTIVE CONTROL regional power grid systemtotalIncluding with
Lower step, first gives power P0, regional power grid real output P is detected in period △ tIt is actualIf, | PIt is actual-P0| it is more than
0.001W, then it is P then to input given performance number0+(PIt is actual-P0)/△ t, are so iterated calculating until | PIt is actual-P0|
In 0.001W.
In such scheme, obtained regional power grid system demand power P is predictedtotalIt is divided into gradual demand power and fast change
Demand power, battery energy storage unit controls gradual demand power, and the control of ultracapacitor energy storage unit is fast to become demand power.
It is P in the energy of t pickup area network system in such schemen, in t+t0Moment pickup area power network
The energy of system is Pn+1If, | (Pn+1-Pn)/t0| less than 4, then battery energy storage unit passes through the gradual demand power of charge and discharge control；
If | (Pn+1-Pn)/t0| more than 4, then ultracapacitor energy storage unit becomes demand power soon by charge and discharge control.
In such scheme, the regional power grid energy storage controller controls the charging and discharging state of the polynary energy-storage system
When, do not allow to discharge when the state-of-charge value SOC of ultracapacitor energy storage unit is not reaching to 95% and discharge be not reaching to it is fair
Perhaps charging is not allowed during depth of discharge 5%；Lithium battery energy storage battery unit, lead-acid accumulator energy-storage units, all-vanadium flow battery energy storage
The state-of-charge value SOC of unit be not reaching to 80% do not allow to discharge and discharge be not reaching to permission depth of discharge 20% when do not permit
Perhaps charge.
Implement a kind of polynary energy storage fusion method for improving regional power grid energy utilization rate of the present invention, with following beneficial effect
Really：
1st, the charge/discharge operation state of the polynary energy-storage units of reasonable distribution of the present invention, the utilization rate of polynary energy-storage units is high；
2nd, polynary in the regional power grid system access energy-storage units of the present invention, can effective inhibition zone network system power
Fluctuation, it is to avoid the abundant area of regenerative resource occurs abandoning light wind-abandoning phenomenon in unbalanced power, can effectively improve regional power grid
The energy utilization rate of system；
3rd, the present invention can extend the service life of battery energy storage unit, can be within unified time to battery energy storage unit
Overall maintenance is carried out, operation cost is reduced；
4th, present invention configuration access ultracapacitor energy storage unit, can effective inhibition zone network system high-power ripple
It is dynamic.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the scheme of installation of regional power grid Demonstration Base；
Fig. 2 shows for the strategy of ultracapacitor energy storage unit and battery energy storage unit control area network system demand power
It is intended to；
Fig. 3 is the control strategy block diagram of polynary energy-storage system.
Embodiment
In order to which technical characteristic, purpose and effect to the present invention are more clearly understood from, now compare accompanying drawing and describe in detail
The embodiment of the present invention.
The present invention provides a kind of polynary energy storage fusion method for improving regional power grid energy utilization rate, regional power grid system bag
Polynary energy-storage system, regional power grid energy storage controller and the photovoltaic panel group being connected with polynary energy-storage system and wind-driven generator are included,
Polynary energy-storage system includes multigroup energy storage separately constituted by lithium battery, lead-acid accumulator, ultracapacitor, all-vanadium flow battery
Unit, every group of energy-storage units are all connected to regional power grid dc bus by DC/DC converter units.With certain regional power grid demonstration base
Exemplified by ground, as shown in figure 1, it is provided with photovoltaic generating system and wind generator system, wherein photovoltaic capacity 100kW, wind-force hair
Capacitance 50kW, configuration 5kW super capacitor energy storage system, 10kW lead-acid accumulators energy-storage system, 15kW ferric phosphate lithium cells
Energy-storage system, 20kW all-vanadium flow batteries energy-storage system and 100kW loads.Distribution method is：It is 1kW per pool-size to configure 5 groups
Ultracapacitor energy storage unit, 5 groups of configuration are 2kW lead-acid accumulator energy-storage units per pool-size, configure 5 groups and are per pool-size
3kW ferric phosphate lithium cells energy-storage units, 2 groups of configuration are that 10kW all-vanadium flow batteries energy-storage units and 100kW are loaded per pool-size.
Every group of energy-storage units are all connected on regional power grid dc bus by DC/DC modules.The polynary energy storage fusion method method bag
Include：
Demand power P of the polynary energy-storage system to regional power grid systemtotalControl is predicted, following control is specifically used
Method：First give power P0, regional power grid real output P is detected in period △ tIt is actualIf, | PIt is actual-P0| it is more than
0.001W, then it is P then to input given performance number0+(PIt is actual-P0)/△ t, are so iterated calculating until | PIt is actual-P0|
In 0.001W.
Predict obtained regional power grid system demand power PtotalIt is divided into gradual demand power and fast change demand power.Battery
Energy-storage units control gradual demand power；The control of ultracapacitor energy storage unit is fast to become demand power, for example, regional power grid system
Demand power PtotalWhen having great power fluctuation, ultracapacitor energy storage unit preferentially puts into operation, absorbs or releases electric energy
To stabilize regional power grid system power quality fluctuation, reference picture 2 is P in the energy of t pickup area network systemn, in t+
t0The energy of moment pickup area network system is Pn+1If, | (Pn+1-Pn)/t0| less than 4, then battery energy storage unit passes through charge and discharge
The gradual demand power of electric control；If | (Pn+1-Pn)/t0| more than 4, then ultracapacitor energy storage unit is become soon by charge and discharge control
Demand power.
Regional power grid energy storage controller records every group of lithium battery energy storage battery unit, lead-acid accumulator energy-storage units, all-vanadium flow
The charging and discharging state of battery energy storage unit.According to every group of lithium battery energy storage battery unit, lead-acid accumulator energy-storage units, all-vanadium flow electricity
Discharge and recharge (SOC) state of pond energy-storage units, its working condition of reasonable disposition makes it be operated in optimal range of operation.Tool
Body uses following control method：The state-of-charge value SOC of ultracapacitor energy storage unit does not allow electric discharge when being not reaching to 95%
And electric discharge be not reaching to permission depth of discharge 5% when do not allow charging；Lithium battery energy storage battery unit, lead-acid accumulator energy-storage units,
The state-of-charge value SOC of all-vanadium flow battery energy-storage units, which is not reaching to 80% and does not allow to discharge and discharge to be not reaching to, to be allowed to put
Charging is not allowed during electric depth 20%.
Discharge and recharge number of times of the regional power grid energy storage controller record per Battery pack energy-storage units, according to every group of lithium battery energy storage battery
Unit, lead-acid accumulator energy-storage units, the discharge and recharge number of times of all-vanadium flow battery energy-storage units, its working condition of reasonable disposition,
It is set to be operated in optimal range of operation.Specifically use following control method：Lithium battery energy storage battery unit, lead-acid accumulator energy storage
Unit, the discharge and recharge number of times ratio of all-vanadium flow battery energy-storage units are 30:5:130, the maximum charge and discharge of lithium battery energy storage battery unit
Electric number of times is 3000 times, and the maximum discharge and recharge number of times of lead-acid accumulator energy-storage units is 500 times, all-vanadium flow battery energy-storage units
Maximum discharge and recharge number of times be 13000 times.
The polynary energy storage control strategy of regional power grid includes new energy digestion capability according to multi-target optimum operation, optimization aim
Maximum, polynary energy-storage system discharge and recharge number of times is minimum and regional power grid system operation cost is minimum, polynary energy-storage system discharge and recharge
Watt level and correspondence energy storage group number change according to different operational objectives.
Fig. 3 is the control strategy block diagram of polynary energy-storage system, and it lists correspondence energy storage discharge and recharge under 54 kinds of different conditions
The outer numeral of control strategy, wherein figure center represents the number of times that the output policy is likely to occur in 54 kinds of states.Inframe numeral " 1 " table
Show regional power grid system to the demand of polynary energy-storage system for electric discharge andDigital " 2 " represent regional power grid system pair
The demand of polynary energy-storage system for electric discharge andDigital " 3 " represent regional power grid system to polynary energy-storage system
Demand for electric discharge andDigital " 4 " represent that regional power grid system is electric discharge to the demand of polynary energy-storage system
AndDigital " 5 " represent regional power grid system to the demand of polynary energy-storage system for electric discharge andNumeral
" 6 " represent regional power grid system to the demand of polynary energy-storage system for electric discharge andAlphabetical " a " represents battery SOC
Less than lower limit state；Alphabetical " b " represents that battery SOC is in normal operating conditions；Alphabetical " c " represents that battery SOC is higher than upper limit shape
State.Letter ' d ' represents that ultracapacitor SOC is less than lower limit state；Alphabetical " e " represents that ultracapacitor SOC is in normal work
State；Alphabetical " f " represents that ultracapacitor SOC is higher than upper limit state.Wherein：PtotalRepresent regional power grid system to polynary energy storage
The demand power of system；Represent to allow the ultracapacitor energy storage unit correspondence peak power output of electric discharge；Represent to permit
Perhaps the battery energy storage unit residual capacity correspondence peak power output discharged；Represent to allow the ultracapacitor energy storage list of charging
First maximal input；Represent to allow the battery energy storage unit maximal input of charging.PwWork(is sent for regional power grid system
Rate sum, PboiPower sum need to be consumed for load.
If the demand power P of regional power grid systemtotalLess than zero, | ptotal| it is surplus less than ultracapacitor energy storage unit
Covolume amount correspondence peak power output valueWhen, then first discharge ultracapacitor energy storage unit electricity；| ptotal| it is more thanAnd less than battery energy storage unit residual capacity correspondence peak power outputWithDuring sum, then super electricity is discharged
Container energy-storage units and the electricity of battery energy storage unit storage；If | ptotal| it is more thanWithSum, then discharge super electricity
Container energy-storage units and the electricity of battery energy storage unit storage, and power network is connected, power network is electric by the difference of polynary energy-storage system
Measure input area network system.
Embodiments of the invention are described above in conjunction with accompanying drawing, but the invention is not limited in above-mentioned specific
Embodiment, above-mentioned embodiment is only schematical, rather than restricted, one of ordinary skill in the art
Under the enlightenment of the present invention, in the case of present inventive concept and scope of the claimed protection is not departed from, it can also make a lot
Form, these are belonged within the protection of the present invention.
Claims (5)
1. a kind of polynary energy storage fusion method for improving regional power grid energy utilization rate, the regional power grid system includes polynary storage
Energy system, regional power grid energy storage controller and the photovoltaic panel group being connected with the polynary energy-storage system and wind-driven generator, it is described
Polynary energy-storage system includes multigroup energy storage separately constituted by lithium battery, lead-acid accumulator, ultracapacitor, all-vanadium flow battery
Unit, every group of energy-storage units are all connected to regional power grid dc bus by DC/DC converter units, it is characterised in that the side
Method includes：
Demand power P of the polynary energy-storage system to regional power grid systemtotalIt is predicted control；
The regional power grid energy storage controller records every group of lithium battery energy storage battery unit, lead-acid accumulator energy-storage units, all-vanadium flow
The charging and discharging state of battery energy storage unit, control battery energy storage unit does not allow electric discharge and in electric discharge before not fully charged
Do not allow charging when being not reaching to permission depth of discharge；
Discharge and recharge number of times of the regional power grid energy storage controller record per Battery pack energy-storage units, controls lithium battery energy storage battery list
Member, the discharge and recharge number of times ratio of lead-acid accumulator energy-storage units, all-vanadium flow battery energy-storage units are 30:5:130, lithium battery storage
The maximum discharge and recharge number of times of energy unit is 3000 times, and the maximum discharge and recharge number of times of lead-acid accumulator energy-storage units is 500 times, Quan Fan
The maximum discharge and recharge number of times of flow battery energy storage unit is 13000 times；
If the demand power P of the regional power grid systemtotalLess than zero, | ptotal| it is remaining less than ultracapacitor energy storage unit
Capacity correspondence peak power output valueWhen, then first discharge ultracapacitor energy storage unit electricity；| ptotal| it is more than
And less than battery energy storage unit residual capacity correspondence peak power outputWithDuring sum, then ultracapacitor is discharged
Energy-storage units and the electricity of battery energy storage unit storage；If | ptotal| it is more thanWithSum, then discharge ultracapacitor
Energy-storage units and the electricity of battery energy storage unit storage, and power network is connected, power network is defeated by the difference electricity of polynary energy-storage system
Enter regional power grid system.
2. a kind of polynary energy storage fusion method for improving regional power grid energy utilization rate according to claim 1, its feature
It is, the demand power P of the polynary energy-storage system PREDICTIVE CONTROL regional power grid systemtotalComprise the following steps, first give work(
Rate P0, regional power grid real output P is detected in period △ tIt is actualIf, | PIt is actual-P0| it is more than 0.001W, then then defeated
Enter given performance number for P0+(PIt is actual-P0)/△ t, are so iterated calculating until | PIt is actual-P0| in 0.001W.
3. a kind of polynary energy storage fusion method for improving regional power grid energy utilization rate according to claim 2, its feature
It is, predicts obtained regional power grid system demand power PtotalIt is divided into gradual demand power and fast change demand power, battery storage
Can the gradual demand power of unit control, the fast change demand power of ultracapacitor energy storage unit control.
4. a kind of polynary energy storage fusion method for improving regional power grid energy utilization rate according to claim 3, its feature
It is, is P in the energy of t pickup area network systemn, in t+t0The energy of moment pickup area network system is Pn+1,
If | (Pn+1-Pn)/t0| less than 4, then battery energy storage unit passes through the gradual demand power of charge and discharge control；If | (Pn+1-Pn)/t0|
More than 4, then ultracapacitor energy storage unit becomes demand power soon by charge and discharge control.
5. a kind of polynary energy storage fusion method for improving regional power grid energy utilization rate according to claim 1, its feature
It is, when the regional power grid energy storage controller controls the charging and discharging state of the polynary energy-storage system, ultracapacitor energy storage
The state-of-charge value SOC of unit does not allow to discharge when being not reaching to 95% and discharged when being not reaching to permission depth of discharge 5% not
Allow charging；Lithium battery energy storage battery unit, lead-acid accumulator energy-storage units, the state-of-charge value of all-vanadium flow battery energy-storage units
SOC be not reaching to 80% do not allow to discharge and discharge be not reaching to permission depth of discharge 20% when do not allow charging.
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| CN111106667A (en) * | 2019-12-19 | 2020-05-05 | 华为技术有限公司 | Power supply device and power supply system |
| CN114362201A (en) * | 2021-12-29 | 2022-04-15 | 华北电力科学研究院有限责任公司 | Power grid power balance control method and device and energy storage power station cluster |
| CN114362201B (en) * | 2021-12-29 | 2024-03-12 | 华北电力科学研究院有限责任公司 | Power grid power balance control method and device and energy storage power station cluster |
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