CN109599932A - Dynamic hybrid energy-storing control strategy based on supercapacitor and lithium battery SOC - Google Patents
Dynamic hybrid energy-storing control strategy based on supercapacitor and lithium battery SOC Download PDFInfo
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- CN109599932A CN109599932A CN201811554577.1A CN201811554577A CN109599932A CN 109599932 A CN109599932 A CN 109599932A CN 201811554577 A CN201811554577 A CN 201811554577A CN 109599932 A CN109599932 A CN 109599932A
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- supercapacitor
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Classifications
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
-
- 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
- H02J15/00—Systems for storing electric energy
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention patent belong to new energy energy storage and electric system energy storage optimization field, be related to the control strategy of the dynamic hybrid energy-storing based on supercapacitor and lithium battery SOC, by mixed energy storage system power instruction between each energy-storage travelling wave tube reasonable distribution.The present invention can effectively stabilize the fluctuation situation of accumulator cell charging and discharging power; improve the service life of battery; for that in any case, can efficiently accomplish the super-charge super-discharge protection to energy storage device, while the hybrid energy-storing control strategy also has the characteristics that fast response time.
Description
Technical field
The invention patent relates to the control strategies based on supercapacitor and the dynamic hybrid energy-storing of lithium battery SOC, specifically
For, it is related to the power distribution of hybrid energy-storing control system and the cooperation of super-charge super-discharge protection, belongs to new energy energy storage
And electric system energy storage optimizes field.
Background technique
As combustion of fossil fuel bring environmental pollution is on the rise and the mankind are increasing for the demand of the energy,
Reach common understanding for the development and utilization of renewable energy countries in the world.But since the renewable energy such as wind energy, solar energy have
The features such as intermittent strong, fluctuation is big, causes electricity generation system power quality and reliability to reduce.To solve this problem, can
Energy storage device is introduced in renewable energy generating system, is allowed to the raw energy and is received well by bulk power grid.Energy storage device is divided into
Two class of energy type and power-type, energy type have energy storage time length, energy density big but power density using battery as representative
Feature small, the response time is long, cycle life is short；Power-type is using supercapacitor as representative, when having big power density, response
Between it is short, have extended cycle life but energy density is small, self discharge power is high feature.For the power for meeting electric system different levels
Energy type is used in combination demand with power-type energy storage device learns from other's strong points to offset one's weaknesses, and gives full play to respective advantage, realizes technology complementation.For
The performance advantage for giving full play to energy storage device needs to further investigate its control strategy.
Document " the mixed energy storage system control strategy design based on charging and discharging lithium battery state " is in the charge and discharge of lithium battery
It under conditions of state determines, is analyzed by state-of-charge (SOC) to supercapacitor and power direction, controls high pass
Time constant filter (T), completes redistributing for power, so that supercapacitor operates in target area, it is complete in power distribution
At later, two element cooperations are avoided into super-charge super-discharge with maximum charge-discharge electric power limiting element in super-charge super-discharge protection
The appearance of phenomenon.The power instruction of tracking hybrid energy-storing to the greatest extent, improves overall performance.But in super-charge super-discharge ring
Section, does not consider the size of the practical reference power of battery and supercapacitor, it would still be possible to will lead to super-charge super-discharge.It is filtered in high pass
Fixed step size changing method is used in wave device time constant control process, it is too long and cannot be quick that this will lead to program runtime
Tracking hybrid energy-storing power instruction the problems such as.
Summary of the invention
The invention patent in view of the above problems, provides a kind of dynamic based on supercapacitor and lithium battery SOC
Hybrid energy-storing control strategy proposes to protect using the method for actual power, in power distribution for super-charge super-discharge protection
Link proposes to move based on the actual state-of-charge of supercapacitor and battery for high-pass filter time constant
The time constant of state is modified, and the efficiency of power distribution is improved.
The invention patent to achieve the above object, takes following technical scheme to be achieved:
Mixed energy storage system power instruction carries out power distribution by high-pass filter, and high-pass filter time constant is by height
Bandpass filter time constant modified module provides.It is supercapacitor power instruction, low frequency that high frequency power is obtained after power distribution
Power is battery power instruction.Two power instructions enter the protection of super-charge super-discharge cooperation and the protection of maximum power limit value
Module.
Super-charge super-discharge harmonious protection and maximum power limit value protective module detect real-time supercapacitor and battery
State-of-charge, and according to the state-of-charge of supercapacitor and battery carry out the protection of super-charge super-discharge cooperation, be divided into only
It overcharges protection, only Cross prevention while carrying out super-charge super-discharge protection while carrying out overcharging protection or carrying out over-discharge guarantor simultaneously
Four kinds of situations are protected to carry out the cooperation between two kinds of energy storage devices.
Maximum power limit value link is entered to super to the modification of power instruction by super-charge super-discharge cooperation link of protection
The power instruction for crossing limit is modified.The power instruction of output is the reference power of supercapacitor and battery.
DC/DC control module is controlled using reference power, and reference power is based on supercapacitor and lithium battery SOC
The power instruction that dynamic hybrid energy-storing control strategy obtains, DC/DC control module is by the duty ratio of control thyristor to reality
Now to the realization of power instruction.
The charge-discharge electric power for detecting supercapacitor and battery judges the charging and discharging state of battery, according to battery
Charging and discharging state, determine the target area of supercapacitor, detect the state-of-charge of supercapacitor, judge supercapacitor
Whether work in target area, when its work has optimal performance in target area, to surpass by adjusting time constant
Grade capacitor operates in target area.According to the SOC of supercapacitor when adjustment time constant, come when dynamically being adjusted
Between constant adjustment amount.
The invention patent has the following beneficial effects: compared with the existing technology
● dynamic time constant method of adjustment is used, hybrid energy-storing control strategy is made to have the characteristics that fast response time
● the fluctuation situation for having stabilized accumulator cell charging and discharging power improves the service life of battery
● in any case, can effectively complete the super-charge super-discharge protection to energy storage device
Detailed description of the invention
Fig. 1 is photovoltaic microgrid structural schematic diagram of the invention patent containing hybrid energy-storing
Fig. 2 is the invention patent hybrid energy-storing control strategy flow chart
Fig. 3 is the invention patent high-pass filter time constant modified module specific flow chart
Fig. 4 is the protection of the invention patent super-charge super-discharge cooperation and maximum power protective module flow chart
Fig. 5 is the invention patent supercapacitor target area schematic diagram
Specific embodiment
It is described in detail below in conjunction with embodiment of the attached drawing to the invention patent.
As shown in Figure 1, building the microgrid structural model of photovoltaic containing hybrid energy-storing.Hybrid energy-storing module, photovoltaic generating module point
It is not incorporated to DC bus through DC/DC converter, then through in DC/AC inverter access AC network.Wherein DC/DC, which is used, refers to function
Rate control, DC/AC are controlled using constant voltage constant frequency.
It is illustrated in figure 2 the overall flow figure of hybrid energy-storing control.Power distribution module is normal using the high-pass filter time
Number modified modules output time constant T carry out power distribution, by allocation result be output to super-charge super-discharge cooperation protection with
And maximum power limit value protective module；The protection of super-charge super-discharge cooperation and maximum power limit value protective module are by power distribution
The power distribution result of module output according to real-time detection to supercapacitor and the SOC of battery and overcharging according to formulation
Cross prevention rule and maximum power limit value safeguard rule are modified, and modified power instruction is output to DC/DC control
Molding block；DC/DC control module is controlled using reference power, is exported using super-charge super-discharge and maximum power limit value protective module
Power instruction, the DC/DC of supercapacitor and battery circuit is controlled, is completed to the reality of given power instruction
It is existing；Time constant modified module acquires supercapacitor and the real-time SOC of battery and charging and discharging state, when to filter
Between constant T modify, and modified time constant T is output to power distribution module.
Fig. 3 is the detailed process of time constant modified module.State-of-charge by detecting supercapacitor obtains SOCsc
And the charging and discharging state of two elements, the dynamic adjustment of time constant is carried out, to adjust P in real timeBAnd PSCValue, realize more
The tracking P of fittingHESS.Fig. 5 is the schematic diagram of supercapacitor target area, when battery charging, supercapacitor target
Region is SOCsc>SOCbc_sc, discharge power is mainly undertaken by supercapacitor；When electric power storage tank discharge, supercapacitor target
Region is SOCsc<SOCbd_sc, charge power is mainly undertaken by supercapacitor, the specific steps are as follows:
Step 1: PHESSHybrid energy-storing obtains power instruction of the high fdrequency component as supercapacitor through high-pass filter
PSC, power instruction P of the low frequency part as batteryB。
Step 2: judge the charging and discharging state of battery.Due to supercapacitor fast response time, have extended cycle life,
The big feature of lithium battery energy density.To realize that lithium battery undertakes the power of change frequency smaller portions, by supercapacitor pair
PHESSChanging unit compensates.Concrete methods of realizing is as follows:
If battery is in discharge condition, that is, PB> 0, judge supercapacitor SOCscWhether it is greater than under battery discharging condition
The threshold value SOC of supercapacitor target areabd_scIf SOCsc>SOCbd_scIllustrate that supercapacitor can also be shared for lithium battery
Power enters step three；If SOCsc<SOCbd_scIllustrate that supercapacitor cannot share more power instructions again, then
Three directly outputs are not entered step.If battery is in charged state, that is, PB< 0, judge SOCscSurpass under battery charge condition
The threshold value SOC of grade capacitor target areabc_scSize relation, if SOCsc<SOCbc_scIllustrate that supercapacitor can also be replaced
Lithium battery shares power instruction, enters step three；If SOCsc>SOCbc_scIllustrate that supercapacitor cannot share more function again
Rate instructs, then not entering step three directly outputs.
Step 3: when electric power storage tank discharge, if supercapacitor is also discharged, using the method for dynamic adjustment time constant, △ T
=k (SOCsc-SOCbd_sc) △ t, T=T+ △ T, power distribution is run again, detects SOCsc, return step two；If super capacitor
Device charging, using the method for dynamic adjustment time constant, △ T=k (SOCbd_sc-SOCsc) △ t, T=T+ △ T, power divides again
With operation, SOC is detectedsc, return step two.It is normal using dynamic adjustment time if supercapacitor also charges when battery charges
Several methods, △ T=k (SOCbc_sc-SOCsc) △ t, T=T+ △ T, power distribution is run again, detects SOCsc, return step
Two；If supercapacitor is discharged, using the method for dynamic adjustment time constant, △ T=k (SOCsc-SOCbc_sc) △ t, T=T+
△ T, power distribution is run again, detects SOCsc, return step two.
Fig. 4 is the flow chart that super-charge super-discharge cooperation is protected and maximum power is protected.The super-charge super-discharge of energy storage device
Very big injury can be caused to energy storage device, so protecting using super-charge super-discharge, in order to which two energy-storage travelling wave tubes give full play to its storage
Energy characteristic, two elements cooperation is used.Setting overcharges security area, normal area, over-discharge security area.By super-charge super-discharge protection point
For following four situation:
(1) only single energy-storage travelling wave tube needs Cross prevention.If battery needs Cross prevention PBBy formulaIt is adjusted, PSCIt is adjusted to PHESS-PB；If supercapacitor needs Cross prevention with electric power storage
Pond uses identical method.(2) only single energy-storage travelling wave tube need to overcharge protection.If battery needs Cross prevention PBAccording toIt is adjusted, PBIt is adjusted to PHESS-PB；If super capacitor needs overcharge protection with electric power storage
Pond uses identical method.(3) two energy-storage travelling wave tubes carry out super-charge super-discharge protection simultaneously.If battery needs Cross prevention and surpasses
Grade capacitor needs overcharge protection and then adjust PBFor PB| △ P |, adjust PSCFor PSC+|△P|；If supercapacitor needs over-discharge
Protection and battery needs overcharge protection then adjust PSCFor PSC| △ P |, adjust PBFor PB+|△P|.Wherein | △ P |=0.5 (|
△PD|+|△PC|), △ PCTo need to overcharge the power adjustment that the energy-storage travelling wave tube of protection needs, △ PDTo need Cross prevention
Energy-storage travelling wave tube need power adjustment.(4) two energy-storage travelling wave tubes carry out overcharging protection simultaneously or carry out over-discharge guarantor simultaneously
Shield.P when carrying out overcharging protection simultaneouslyBAnd PSCAll in accordance withIt is adjusted；Over-discharge is carried out simultaneously
P when protectionBAnd PSCAll in accordance withIt is adjusted.
Mixed energy storage system modifies mixing when reaching its charge-discharge electric power limit value in battery and supercapacitor
The power instruction of energy storage carries out charge and discharge by the maximum power of mixed energy storage system.
If PB>PBmax_b, then PB=PBmax_b；If PB<PBmax_c, PB=PBmax_c.Wherein PBmax_bWhen for electric power storage tank discharge most
High-power limit value, PBmax_cMaximum power limit value when to charge the battery.
If PSC>PSCmax_b, then PSC=PSCmax_b；If PSC>PSCmax_c, PSC=PSCmax_c.Wherein PSCmax_bFor super capacitor
Maximum power limit value when device discharges, PSCmax_cMaximum power limit value when charging for supercapacitor.
Only as described above, the only preferred embodiment of the invention patent, when this practical invention cannot be limited with this
The range of patent, i.e., in every case according to simple equivalent made by content documented by the invention patent claim and description of the invention
Variation and modification, all still belong within the invention patent claim scope.In addition, abstract part and title are intended merely to
Auxiliary patent document search is used, and is not intended to limit the invention the interest field of patent.
Claims (6)
1. the dynamic hybrid energy-storing control strategy based on supercapacitor and lithium battery SOC is applied to new energy micro-grid system,
It is characterized in that the new energy micro-grid system includes to control mould based on the dynamic hybrid energy-storing of supercapacitor and battery SOC
Block, DC/DC control module, hybrid energy-storing module, which comprises
The dynamic hybrid energy-storing control module based on supercapacitor and battery SOC is completed to divide to given power instruction
Frequently, the protection of super-charge super-discharge cooperation, the protection of maximum power limit value, are sent to DC/DC control module for power instruction after adjustment；
The DC/DC control module is controlled using reference power, using based on supercapacitor and the mixing of the dynamic of battery SOC
The power instruction of energy storage control module output, controls hybrid energy-storing circuit DC/DC, completes the reality to given power instruction
It is existing.
2. strategy according to claim 1, which is characterized in that use supercapacitor and battery charged shape in real time
State, which comprises
Using the state-of-charge of detection device real-time detection supercapacitor and battery, and the signal that will test is sent to and is based on
The dynamic hybrid energy-storing control module of supercapacitor and battery SOC.
3. the dynamic hybrid energy-storing control strategy based on supercapacitor and lithium battery SOC, which is characterized in that refer to given power
It enables and completes power distribution, the method also includes:
According to based on supercapacitor and battery SOC to the high-pass filter modified time constant of time constant dynamic come into
Row power distribution, PHESSHybrid energy-storing obtains power instruction P of the high fdrequency component as supercapacitor through high-pass filterSC, low
Power instruction P of the frequency part as batteryB。
4. strategy according to claim 3, which is characterized in that based on supercapacitor and battery SOC to high-pass filtering
Device time constant dynamic is modified, and the method step includes:
Step 1: judge the charging and discharging state of battery；
Step 2: using the method for dynamic adjustment time constant, △ T=k (SOCsc-SOCbd_sc) △ t, T=T+ △ T, function again
Rate distribution operation.
5. the dynamic hybrid energy-storing control strategy based on supercapacitor and lithium battery SOC, which is characterized in that fully considered super
Mutual cooperation between grade capacitor and battery realizes that supercapacitor and battery are assisted in the case where meeting protection requirement condition
Allotment is closed, and the method step includes:
Step 1: judge supercapacitor and storage battery charge state；
Step 2: carry out super-charge super-discharge protection, meet both all do not overcharge, non-over-discharge under conditions of, carry out cooperation.
6. strategy according to claim 5, which is characterized in that the method to the progress of supercapacitor and battery most
High-power limit value protection, the specific method is as follows:
When the charge-discharge electric power that energy-storage travelling wave tube undertakes is more than its maximum charge-discharge electric power, then modifying power instruction is its maximum charge and discharge
Electrical power.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111711258A (en) * | 2020-06-30 | 2020-09-25 | 湘潭大学 | Hybrid energy storage control method based on railway power regulator |
| CN112952957A (en) * | 2021-03-30 | 2021-06-11 | 国网宁夏电力有限公司 | Hybrid energy storage system SOC optimization strategy based on model predictive control |
| CN113595526A (en) * | 2021-07-30 | 2021-11-02 | 西安热工研究院有限公司 | Hybrid energy storage frequency division sliding filtering method |
| CN114069668A (en) * | 2021-11-18 | 2022-02-18 | 国网江苏省电力有限公司电力科学研究院 | Multi-energy-storage hybrid coordination control method and device |
| CN118508576A (en) * | 2024-07-18 | 2024-08-16 | 西安热工研究院有限公司 | Intelligent control method and system for energy storage system of super-capacity coupling lithium battery |
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| CN118508576A (en) * | 2024-07-18 | 2024-08-16 | 西安热工研究院有限公司 | Intelligent control method and system for energy storage system of super-capacity coupling lithium battery |
| CN118508576B (en) * | 2024-07-18 | 2024-10-18 | 西安热工研究院有限公司 | Intelligent control method and system for energy storage system of super-capacity coupling lithium battery |
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Application publication date: 20190409 |