CN106961150A - The control method and system of composite energy storage battery - Google Patents
The control method and system of composite energy storage battery Download PDFInfo
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- CN106961150A CN106961150A CN201610016126.7A CN201610016126A CN106961150A CN 106961150 A CN106961150 A CN 106961150A CN 201610016126 A CN201610016126 A CN 201610016126A CN 106961150 A CN106961150 A CN 106961150A
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- 239000002131 composite material Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004146 energy storage Methods 0.000 title claims abstract description 39
- 230000005611 electricity Effects 0.000 claims abstract description 55
- 239000002253 acid Substances 0.000 claims description 66
- 229910052744 lithium Inorganic materials 0.000 claims description 53
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 52
- 238000005070 sampling Methods 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 2
- 230000000295 complement effect Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 11
- 238000007599 discharging Methods 0.000 description 9
- 238000012544 monitoring process Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003862 health status Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000005955 Ferric phosphate Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229940032958 ferric phosphate Drugs 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H02J7/0003—
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- Engineering & Computer Science (AREA)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The present invention relates to field of electrical control, more particularly to a kind of control method and system of composite energy storage battery.The AC energy that electricity generation module is produced is converted into after direct current energy, and by dc bus DC power output；Inverter is supplied to corresponding load after direct current energy is converted into the AC energy suitable for correspondence load；Wherein, when the AC energy that electricity generation module is produced is more than the AC energy that load needs, the AC energy having more is converted into direct current energy, by the control of a battery controller, the direct current energy is stored in energy-type cells and/or power type battery；When the AC energy that electricity generation module is produced is less than the AC energy that load needs, battery controller control energy-type cells and/or power type battery provide electric energy to load, wherein, the power density of energy-type cells is less than power type battery；The energy density of energy-type cells is more than power type battery.
Description
Technical field
The present invention relates to field of electrical control, more particularly to a kind of control method and system of composite energy storage battery.
Background technology
Current wind-light complementary system is a kind of distributed energy electric power system, generally include wind-driven generator, photovoltaic module,
Wind/light complementation controller, battery (usually using lead-acid battery) and the big part of inverter four, as shown in figure 1, scene is mutually
The electrical problem in remote districts or power supply inconvenience area can be solved by mending electric power system.For example, wind-driven generator changes wind energy
For three-phase alternating current electricity output, generally using magneto, small-sized wind power generator does not possess change slurry function generally.Photovoltaic module
Direct current energy output is converted the solar into, the function of wind/light complementation controller is the alternating current for exporting permanent-magnetic wind driven generator
Direct current energy can be converted to, match battery voltage is realized the protection, photovoltaic reverse power protection, cell charge protection of blower fan, also may be used
The maximal power tracing of blower fan and photovoltaic is realized as needed.Battery plays vital effect in the entire system, when
Remaining electric energy is stored using battery charging when honourable resources supplIes are preferable, electric power storage is passed through when honourable resource is bad
Tank discharge uses the electric energy output of storage for power load, and current battery generally selects colloid lead-acid battery.
Wind-photovoltaic complementary power supply system is proposed more to the energy density of energy-storage battery, power density, service life and price
High demand, this is that traditional lead-acid battery or lithium battery are implacable.Existing lead-acid battery is recycled charge and discharge electric life
Relatively low, typically only 200~500 times, the battery time of usual 1 year or so of wind-photovoltaic complementary power supply system is accomplished by changing；
The continuous improvement required with electricity consumption level, the power of power load gradually increases, especially the use of high-power load in short-term,
Peak power is greatly increased in short-term for load.In order to solve the problem, blower fan and photovoltaic except needing the bigger generated output of outfit
Component, in addition it is also necessary to configure the battery of more Large Copacity to meet power demand.Lead-acid battery energy density is high, but power density
It is low, therefore lead-acid battery number in parallel can only be increased, it is forced to increase the method for lead-acid battery configuration capacity to obtain big charge and discharge
Electrical power, greatly increases the volume, weight and cost of system；If considering need for electricity, system cost, volume and weight etc.
Many factors, battery configuration is more likely to the allocation plan using high-power and minimum stored energy capacitance.Battery no longer work
Make in the operating mode of low current discharge and recharge, but high current charge-discharge can reduce battery energy storage utilization rate, while can also reduce plumbic acid
The service life of battery.
Traditional wind-photovoltaic complementary power supply system, lead-acid battery is directly hung between charge power supply and power load, plumbic acid electricity
The discharge and recharge in pond depends on the difference of wind light generation power and power load power, and lead-acid battery discharge and recharge is completely uncontrolled, does not have
There are other means and approach to go to realize the management of charging and discharging of battery, it is impossible to effectively improve battery utilization rate and service life, this
Outside, wind-photovoltaic complementary power supply system, the use of lead-acid battery is excessively extensive, lacks to lead-acid battery electricity, unbalanced situation and is good for
The monitoring of health situation etc., is unfavorable for operation and maintenance, even there is composite energy storage, is also in parallel with lead-acid battery by lithium battery
Mode constitute a composite battery component, the matching to two kinds of batteries requires high, and the output characteristics of two kinds of batteries can not
Independent flexible control is realized, it is impossible to give full play to the complementary characteristic of two kinds of batteries, in terms of lifting life-span and capacity usage ratio
Effect have a greatly reduced quality.
The content of the invention
For problems of the prior art, the invention provides a kind of composite energy storage electricity for increasing battery bulk life time
The control method and system in pond.
The present invention includes following technical scheme：
A kind of control method of composite energy storage battery, the control method includes：
The AC energy that electricity generation module is produced is converted into after direct current energy, and exports the direct current by dc bus
Energy；
Inverter is supplied to corresponding institute after the direct current energy is converted into the AC energy suitable for correspondence load
State load；Wherein,
When the AC energy that the electricity generation module is produced is more than the AC energy that the load needs, by what is had more
The AC energy is converted to direct current energy, and by the control of a battery controller, the direct current energy is stored in into energy type electricity
In pond and/or power type battery；
When the AC energy that the electricity generation module is produced is less than the AC energy that the load needs, the battery
Controller controls the energy-type cells and/or power type battery to provide electric energy to the load, wherein,
The power density of the energy-type cells is less than the power type battery；The energy density of the energy-type cells is big
In the power type battery.
It is preferred that, in the control method, the energy-type cells are lead-acid battery and/or the power type battery is lithium
Battery.
It is preferred that, in the control method, when the AC energy that the electricity generation module is produced is needed less than the load
During the AC energy wanted, the power type battery charging；And
When the power type battery charges to the 70% of battery electric quantity, the energy-type cells are started to charge up and described
Power type battery pressure limiting constant-current charge.
It is preferred that, in the control method, when the energy-type cells charge to the 80% of battery electric quantity, the energy
Amount type battery modified constant-voltage charge.
It is preferred that, it is described after the energy-type cells and the power type battery electricity are each filled with the control method
Battery controller lifts DC bus-bar voltage, coordinates electricity generating controller to realize that abandoning wind abandons light.It is preferred that, in the control method,
When the AC energy that the electricity generation module is produced is less than the AC energy that the load needs, it is less than institute in output power
When stating load rating power, preferentially discharged using the power type battery, be 20% in the dump energy of the power type battery
When, the energy-type cells start electric discharge.
It is preferred that, in the control method, when the AC energy that the electricity generation module is produced is needed less than the load
During the AC energy wanted, in the power type battery discharge process, if the power type battery discharge current is more than the work(
Rate battery allows maximum discharge current, and the capacity cell and the energy-type cells discharge simultaneously according to setting ratio.
It is preferred that, in the control method,
The battery controller gathers dc bus electric signal in dc bus side, and the battery controller is according to collection
The dc bus electric signal controls the working condition of the energy-type cells and/or the power type battery in real time；
The battery controller collecting energy type cell electric signal, institute is controlled according to the energy-type cells electric signal in real time
State the working condition of power type battery and/or the energy-type cells；
The battery controller gathers power type battery electric signal, and institute is controlled in real time according to the power type battery electric signal
State the working condition of power type battery and/or the energy-type cells.
It is preferred that, the control method also includes：
The battery controller is detected and/or protected to the energy-type cells and the power type battery.
It is preferred that, the control method also includes：
Battery protection system carries out battery protection to the power type battery.
A kind of control system of composite energy storage battery, it is characterised in that provide electric energy to load applied to generator unit
During, the control system includes：
Inverter；
Generator unit, is connected by the inverter with the load, to provide electric energy to the load；
Battery pack, is connected with inverter and the generator unit respectively, to store the electric energy of the generator unit output,
And the electric energy that the load obtains the battery pack or generator unit offer by the inverter is operated；
Battery controller, is connected with the battery pack, to control the charge/discharge of the battery pack；
Wherein, the battery pack at least includes energy-type cells and power type battery, and the power of the energy-type cells
Density is less than the power type battery, and the energy density of the energy-type cells is more than the power type battery.
It is preferred that, the generator unit includes：
Electricity generation module, produces electric energy；
Electricity generating controller, is connected with the electricity generation module, and is connected by dc bus with the inverter, conversion
The electric energy that the electricity generation module is produced；Wherein,
The electricity generation module includes photovoltaic module and/or wind-driven generator.
It is preferred that, the battery controller includes：
Dc bus sampling unit, the sampling of horizontal electrical signal is entered to the dc bus, obtains dc bus electric signal；
Battery sampling unit, samples to the electric signal of the power type battery and the energy-type cells, obtains respectively
To power type battery electric signal and energy-type cells electric signal；
Main control module, is connected respectively at the dc bus sampling unit, the battery sampling unit, according to the direct current
Bus electric signal and/or power type battery electric signal and/or energy-type cells electric signal to the major loops of energy-type cells and/or
The major loop of power type battery is controlled.
It is preferred that, the energy-type cells are lead-acid battery and/or the power type battery is lithium battery.
The beneficial effects of the invention are as follows：
The present invention uses lead-acid battery and lithium battery as independent individual, and two kinds are realized by battery controller
Two kinds of cell voltages are matched in the adjustment and energy management of the completely self-contained charge and discharge control of battery, dynamic power, the present invention
It is required that it is very low, it can be realized in the range of 0~100%, and two kinds of battery charging and discharging modes and charge-discharge electric power are completely independent
It is controlled, can fully it be sent out on the premise of demand is met according to battery current state and conditions of demand flexibly distribution and management
The characteristics of personality of two kinds of batteries is waved, energy content of battery utilization rate is improved, battery is improved, passes through charge and discharge control and energy
Management, under general operating mode, the preferential lithium electricity higher using cycle life, only in high-power in short-term and electric discharge for a long time demand
Under the conditions of enable lead-acid battery, reduce lead-acid battery usage frequency, add the system overall life-span.
Brief description of the drawings
Fig. 1 is the structural representation of honourable complementary power supply system in the prior art；
Fig. 2 is the structural representation of the control system of composite energy storage of the present invention；
The change curve that Fig. 3 generates electricity with electric power for the present invention；
Fig. 4 a-4c are the comparison diagram of battery selection scheme of the present invention；
Fig. 5 is the electric operation control circuit figure of composite battery of the present invention；
Fig. 6 is the control schematic diagram of battery controller of the present invention；
Fig. 7 is the electric energy management flow chart of battery controller of the present invention；
Fig. 8 is the circuit connection diagram of battery controller of the present invention；
Fig. 9 is the circuit connection diagram of the battery controller based on IGBT in the present invention；
Figure 10 is the circuit connection diagram of the battery controller of the invention based on MOSFET.
Embodiment
It should be noted that in the case where not conflicting, following technical proposals can be mutually combined between technical characteristic.
The embodiment to the present invention is further described below in conjunction with the accompanying drawings：
Fig. 2 is a kind of wind-photovoltaic complementary power supply system structural representation based on composite energy storage that the present embodiment is proposed, this reality
Apply example to be illustrated with wind light generation, as electricity generation module, but be not limited to above two power generation mode, concrete condition can basis
Actual conditions are set.As shown in Fig. 2 using two kinds of energy-storage travelling wave tube cooperatings in system, a kind of energy-storage travelling wave tube energy is close
Degree is high, can turn into energy-type cells；A kind of energy-storage travelling wave tube power density is high, is properly termed as power type battery, and comprehensively the two is excellent
Point, meets the demand of energy and power simultaneously under conditions of volume, weight and cost is reduced as far as possible.The first energy-storage travelling wave tube
Lead-acid battery can be used, energy density is high, low cost, but power density is relatively low.Second of energy-storage travelling wave tube is generally using lithium electricity
Pond, such as lithium titanate battery, ferric phosphate lithium cell, power density are high, and energy density is high, but most current cost is higher, the second energy storage
Element can also use super capacitor, and super capacitor power density is high, but energy density is low, high cost, makes at present in the occasion
It is not good with economy.According to the proportioning of two kinds of energy-storage travelling wave tubes of user's local sights situation and load condition reasonable disposition, to reach
System most has a configuration.Under normal circumstances, lithium battery and lead-acid battery stored energy capacitance proportioning can be 2：8, it might even be possible to lower,
Specific ratio can be set according to details.
In the prior art, wind-driven generator and photovoltaic module can by a wind/light complementation controller, because in the present embodiment with
Wind, light generating are illustrated, and its corresponding electricity generating controller, i.e. wind light mutual complementing control can be used by being generated electricity according to other forms
Device processed can as electricity generating controller one kind, be used as in the present embodiment by wind, light electricity generation module produce AC energy change
Exported for direct current energy by dc bus to inverter, inverter is converted to the direct current energy with using electric loading (load) phase
The AC energy used, the electric energy is exported to load.As it appears from the above, two types battery mentioned above, can be connected to
On dc bus, when the electric energy that load needs is less than the electric energy that electricity generation module is produced, both batteries can be according to setting
Fixed pattern carries out energy storage, on the contrary, when the electric energy that load needs is more than the electric energy that electricity generation module is produced, two kinds of battery meetings
Electric energy is provided for load, except using composite energy storage, from energy-storage travelling wave tube unlike honourable complementary power supply system in the prior art
Hung over by a composite battery controller on dc bus, composite battery controller (battery controller) is to realize wind light mutual complementing
The nucleus equipment of electric power system energy management, its major function includes：The power distribution of lead-acid battery and lithium battery；Lead-acid battery
With the charge and discharge control and battery protection of lithium battery；Lead-acid battery and electric quantity of lithium battery, unbalanced situation and health status etc.
Monitoring；Wind/light complementation controller is coordinated to realize that abandoning wind abandons light；Ensure preferential by the power distribution strategies of composite battery controller
Using charging and discharging lithium battery, system power dynamic equilibrium is maintained, lead-acid battery cycle charge-discharge number of times is reduced, plumbic acid electricity is improved
Pond service life.The control mode of battery controller can be described in detail hereinafter.
Fig. 3 is typical wind light generation power and power load power in somewhere one day, it follows that honourable
Battery in complementary power supply system needs to carry out frequent discharge and recharge in one day to realize the dynamic equilibrium of system power.Lithium electricity
Pond cycle charge discharge electric life is at 2000~3000 times, lead-acid battery cycle charge discharge electric life only 200~500 times, as shown in fig. 4 a
Example, power distribution strategies of the present embodiment based on composite energy storage are preferential to ensure the dynamic work(of system using charging and discharging lithium battery
Rate is balanced, and only honourable condition is not good or the load peak of power consumption period, plumbic acid is just used in the case where electric quantity of lithium battery is inadequate
Battery, substantially increases the service life of lead-acid battery.If ensureing big by the power distribution strategies of composite battery controller
Power load pays the utmost attention to lithium battery compared with high-multiplying power discharge when running, the small multiplying power discharging of lead-acid battery, acquisition system user demand,
Cost, volume and weight most have a performance.Lead-acid battery charge-discharge magnification is no more than 0.3C, and its allocation plan is designed according to 0.3C
As shown in Figure 4 b, in the market lead-acid battery price is generally 500~700 yuan/kWh, and the price of lithium battery is generally 1500~
3000 yuan/kWh, including battery management system (BMS) price, so can be significantly by the technical scheme of the present embodiment
Reduction power supply cost.
As illustrated in fig. 4 c, contrasted by above scheme, big work(is ensured by the power distribution strategies of composite battery controller
Paid the utmost attention to during rate load operation using lithium battery compared with high-multiplying power discharge, the small multiplying power discharging of lead-acid battery, in cost, volume and again
All possesses clear superiority in terms of amount.If only pursuing cost, volume and weight, from the single energy storage mode of lead-acid battery, then plumbic acid
Battery charge most conference is to more than 0.5C, and maximum discharge current maximum more than 1C, such applying working condition can reduce plumbic acid
Battery can reduce lead-acid battery capacity usage ratio and service life.
In the present embodiment, two kinds of batteries connect dc bus by composite battery controller, pass through composite battery controller
The charge and discharge control of two kinds of batteries can be realized.When honourable power is more than bearing power, preferentially using lithium cell charging, to filling
Electric current does not do any limitation, and the dump energy (SOC) of lithium battery reaches 70% or so, charged by lead-acid battery, while to lithium
Battery carries out modified constant-voltage charge, it is ensured that lithium battery is completely filled with.After lithium battery is completely filled with, only lead-acid battery is charged, treated
Lead-acid battery SOC reach 80% or so soon full of when, lead-acid battery modified constant-voltage charge, now remaining honourable power is female by direct current
Line voltage is raised to wind/light complementation controller and abandons the magnitude of voltage that wind abandons light automatically, makes whole electric power system fully charged in composite battery
Automatic incision abandons wind and abandons light state afterwards.It is preferential to be discharged using lithium battery when honourable power is less than bearing power, lithium battery electric discharge
SOC reaches 20% or so and reuses lead-acid battery electric discharge；Lithium battery has the electric pump working time shorter, but power is very big, in wind
Discharged under the poor operating mode of optical condition by lithium battery and lead-acid battery by certain current ratio.By composite battery controller to lithium
The charge and discharge control of battery and lead-acid battery, can improve the utilization rate of battery, can extend the service life of battery again.Compound electric
Pool controller not only realizes the monitoring of lithium battery, while be integrated with lead-acid battery BMS function, realizes lead-acid battery SOC, no
The monitoring of equilibrium degree and health status etc., is conducive to lead-acid battery to safeguard, improves lead-acid battery service life.In the present embodiment
Battery protection system (BMS) can carry out battery protection to lithium battery.
Fig. 5 is the circuit diagram of composite battery controller, as shown in figure 5, the circuit diagram is broadly divided into and controlled back
Road and major loop, wherein major loop include lead-acid battery major loop and lithium battery major loop, and the two shares a control loop.This
In embodiment, control loop includes first voltage sampling unit (voltage sample 1), and the unit enters to the electric signal of dc bus
Row sampling, the dc bus electric signal obtained according to sampling, the first main control unit (master control 1) and/or the second main control unit are (main
2) control controls the working condition of lithium battery major loop and/or lead-acid battery major loop, and second voltage sampling unit is respectively from lithium electricity
The sampling of horizontal electrical signal is entered in pond and lead-acid battery side, and the signal also obtained according to sampling is by the first main control unit and second
Main control unit is controlled accordingly, is also included an external interface in control loop in addition, is received the letter outside control loop
Number, to be controlled operation to control loop, the external interface is described in detail hereinafter.Fig. 6 is composite battery electric operation control circuit figure,
Fig. 6 circuit diagram is broadly divided into lithium battery control block diagram and lead-acid battery control block diagram, wherein the control block diagram of every kind of battery is again
Including the control of dc bus outer shroud and the control of cell voltage outer shroud, when composite battery carries out high power discharge, by two kinds of batteries
Complete electric discharge by a certain percentage simultaneously.Rear program is first powered up as shown in Figure 7 is sequentially completed initialization and holding state automatically, when
When higher level issues start-up command, system initially enters lithium battery working condition after the completion of entering precharging state, preliminary filling, then successively
Flow shown in Fig. 7 is adjusted according to corresponding state carries out redirecting for nominal situation.As shown in figure 8, composite battery controller includes
Circuit part and major loop part are controlled, wherein control circuit is made up of Control card, power supply board, interface board etc., is led back
Road part includes lithium battery and closes lead-acid battery major loop two parts；External interface have dc bus interface, composite battery interface with
And the communication interface with lithium battery BMS etc..
In the present embodiment, the connection figure based on Fig. 5 uses RS485 communication modes, and lead between interface board and control panel
CAN connection is crossed, EPO emergent stop signals can control make it that control loop is stopped, to carry out circuit protection, and first leads
Control unit and the second main control unit can also pass through pwm signal according to the electric signal obtained from dc bus side and battery side sampling
Control the dutycycle of control device (example IGBT described as follows or MOSFET) in lithium battery major loop and lead-acid battery major loop
Etc. parameter.As shown in figure 9, the system battery voltage from security standpoint residents is typically relatively low, rated voltage is usually
48V, and DC bus-bar voltage is generally higher, generally in 110V even more highs, battery controller needs to realize DC boosting
Function, and power can be with two-way flow.Utilization rate and the life-span of battery can be influenceed in view of battery current ripple simultaneously, therefore is adopted
Realized with the mode of two-way Buck-boost circuits crisscross parallel, the power that the higher occasion of DC bus-bar voltage is generally selected
Device is IGBT, control that wherein IGBT shut-off and conducting can be by control loops, regulation.The controller root of two kinds of batteries
Lithium battery and lead-acid battery all tunnels of crisscross parallel 3 in the way of crisscross parallel, Fig. 9 are selected according to power demand.Figure 10 be based on
MOSFET composite battery PCS controller implementations, the power devices different from Fig. 9 use MOSFET, except crisscross parallel,
Also come dilatation by way of MOSFET single tubes are in parallel, the program is suitable for smaller power, and system dc busbar voltage is relatively low
Occasion.
As shown in Figure 9, Figure 10, by way of superimposed current ripple so that lithium battery and the voltage of lead-acid battery output
Tend towards stability, prevent that the voltage pulsation of output is larger, and MOSFET switch susceptibility is higher than IGBT, can improve circuit
Switching frequency, can so strengthen the stability of output voltage.
In summary, composite battery power distribution strategies and control method of the invention, preferentially using charging and discharging lithium battery
The dynamic power balance of wind-light storage complementary power supply system is realized, battery is improved, composite battery charge and discharge control is with protecting
Shield, by coordinating two kinds of battery operated modes, realizes the charge control and control of discharge of lithium battery and lead-acid battery, improves battery
Capacity usage ratio and service life；The present invention realizes the independent neatly charge and discharge control of two kinds of batteries by composite battery controller
And management, greatly reduce the requirement of two kinds of battery matchings；Lithium battery cycle charge discharge electric life is high, is preferentially filled by lithium battery
The power-balance of wind-photovoltaic complementary power supply system is realized in electric discharge, greatly improves lead-acid battery service life；Pass through lithium battery/plumbic acid electricity
The Charge Management in pond, greatly improves the effective rate of utilization of lithium battery and lead-acid battery energy storage electricity, can so reduce lithium battery
With the configuration capacity of lead-acid battery, so as to reduce system cost, volume and weight；By the cooperation charge control of two kinds of batteries,
Ensure honourable resource is preferable and during higher a certain battery electric quantity, DC bus-bar voltage controlled by another battery, while by the electricity
Pond carries out constant voltage and current limiting control, both ensure that the stability of herdsman's wind-photovoltaic complementary power supply system, and had realized and carry to greatest extent again
Plumbic acid battery utilization rate；Managed by the electric discharge of lithium battery/lead-acid battery, it is ensured that during high power load short-term operation, lithium electricity
The big multiplying power discharging in pond, coordinates the small multiplying power discharging of lead-acid battery, in the case where ensuring load power demand, and two kinds of batteries of optimization go out
Power is distributed, and both ensure that the service life of battery, the configuration of battery is reduced again, and reduced cost, volume and weight.
By explanation and accompanying drawing, the exemplary embodiments of the specific structure of embodiment are given, based on essence of the invention
God, can also make other conversions.Although foregoing invention proposes existing preferred embodiment, however, these contents are not intended as
Limitation.
For a person skilled in the art, read after described above, various changes and modifications undoubtedly will be apparent to.
Therefore, appending claims should regard whole variations and modifications of the true intention and scope that cover the present invention as.In power
Any and all scope and content of equal value, are all considered as still belonging to the intent and scope of the invention in the range of sharp claim.
Claims (14)
1. a kind of control method of composite energy storage battery, it is characterised in that the control method includes：
The electric energy that electricity generation module is produced is converted to after direct current energy, and the direct current energy is exported by dc bus；
Inverter is converted to the direct current energy corresponding described negative suitable for being supplied to after the corresponding AC energy loaded
Carry；Wherein,
When the AC energy that the electricity generation module is produced is more than the AC energy that the load needs, described in having more
AC energy is converted to direct current energy, by the control of a battery controller, by the direct current energy be stored in energy-type cells and/
Or in power type battery；
When the AC energy that the electricity generation module is produced is less than the AC energy that the load needs, the battery control
Device controls the energy-type cells and/or power type battery to provide electric energy to the load, wherein,
The power density of the energy-type cells is less than the power type battery；The energy density of the energy-type cells is more than institute
State power type battery.
2. the control method of composite energy storage battery according to claim 1, it is characterised in that in the control method, institute
State that energy-type cells are lead-acid battery and/or the power type battery is lithium battery.
3. the control method of composite energy storage battery according to claim 1, it is characterised in that in the control method, when
When the AC energy that the electricity generation module is produced is less than the AC energy that the load needs, the power type battery fills
Electricity；And
When the power type battery charges to the 70% of battery electric quantity, the energy-type cells are started to charge up and the power
Type battery pressure limiting constant-current charge.
4. the control method of composite energy storage battery according to claim 3, it is characterised in that in the control method, when
When the energy-type cells charge to the 80% of battery electric quantity, the energy-type cells modified constant-voltage charge.
5. the control method of composite energy storage battery according to claim 1, it is characterised in that in the control method, institute
State energy-type cells and after the power type battery electricity is each filled with, the battery controller lifts DC bus-bar voltage, coordinates
Electricity generating controller realizes that abandoning wind abandons light.
6. the control method of composite energy storage battery according to claim 1, it is characterised in that in the control method, when
When the AC energy that the electricity generation module is produced is less than the AC energy that the load needs, it is less than in output power described
During load rating power, preferentially discharged using the power type battery, when the dump energy of the power type battery is 20%,
The energy-type cells start electric discharge.
7. the control method of composite energy storage battery according to claim 6, it is characterised in that in the control method, when
When the AC energy that the electricity generation module is produced is less than the AC energy that the load needs, put in the power type battery
In electric process, if the power type battery discharge current is more than the capacity cell and allows maximum discharge current, the power electricity
Pond and the energy-type cells discharge simultaneously according to setting ratio.
8. the control method of composite energy storage battery according to claim 1, it is characterised in that in the control method,
The battery controller gathers dc bus electric signal in dc bus side, and the battery controller is according to collection
Dc bus electric signal controls the working condition of the energy-type cells and/or the power type battery in real time；
The battery controller collecting energy type cell electric signal, the work(is controlled according to the energy-type cells electric signal in real time
The working condition of rate type battery and/or the energy-type cells；
The battery controller gathers power type battery electric signal, and the work(is controlled in real time according to the power type battery electric signal
The working condition of rate type battery and/or the energy-type cells.
9. the control method of composite energy storage battery according to claim 1, it is characterised in that the control method is also wrapped
Include：
The battery controller is detected and/or protected to the energy-type cells and the power type battery.
10. the control method of composite energy storage battery according to claim 1, it is characterised in that the control method is also wrapped
Include：
Battery protection system carries out battery protection to the power type battery.
11. a kind of control system of composite energy storage battery, it is characterised in that the mistake of electric energy is provided applied to generator unit to load
Cheng Zhong, the control system includes：
Inverter；
Generator unit, is connected by the inverter with the load, to provide electric energy to the load；
Battery pack, is connected with inverter and the generator unit respectively, to store the electric energy of the generator unit output, and institute
Load is stated to be operated by the electric energy of the inverter acquisition battery pack or generator unit offer；
Battery controller, is connected with the battery pack, to control the charge/discharge of the battery pack；
Wherein, the battery pack at least includes energy-type cells and power type battery, and the power density of the energy-type cells
Less than the power type battery, the energy density of the energy-type cells is more than the power type battery.
12. the control system of composite energy storage battery according to claim 11, it is characterised in that the generator unit bag
Include：
Electricity generation module, produces electric energy；
Electricity generating controller, is connected with the electricity generation module, and is connected by dc bus with the inverter, and conversion is described
The electric energy that electricity generation module is produced；Wherein,
The electricity generation module includes photovoltaic module and/or wind-driven generator.
13. the control system of composite energy storage battery according to claim 12, it is characterised in that the battery controller bag
Include：
Dc bus sampling unit, the sampling of horizontal electrical signal is entered to the dc bus, obtains dc bus electric signal；
Battery sampling unit, samples to the electric signal of the power type battery and the energy-type cells, obtains work(respectively
Rate type cell electric signal and energy-type cells electric signal；
Main control module, is connected respectively at the dc bus sampling unit, the battery sampling unit, according to the dc bus
The major loop and/or power of electric signal and/or power type battery electric signal and/or energy-type cells electric signal to energy-type cells
The major loop of type battery is controlled.
14. the control system of composite energy storage battery according to claim 11, it is characterised in that the energy-type cells are
Lead-acid battery and/or the power type battery are lithium battery.
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