CN109120051A - A kind of intelligent multichannel mixed battery manager, the control method of lithium battery power supply unit, base station - Google Patents
A kind of intelligent multichannel mixed battery manager, the control method of lithium battery power supply unit, base station Download PDFInfo
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- CN109120051A CN109120051A CN201811176177.1A CN201811176177A CN109120051A CN 109120051 A CN109120051 A CN 109120051A CN 201811176177 A CN201811176177 A CN 201811176177A CN 109120051 A CN109120051 A CN 109120051A
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- power supply
- bus
- lithium battery
- supply unit
- base station
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 230
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 230
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000002253 acid Substances 0.000 claims abstract description 82
- 238000004891 communication Methods 0.000 claims abstract description 57
- 230000005611 electricity Effects 0.000 claims abstract description 38
- 238000001514 detection method Methods 0.000 claims description 22
- 238000013461 design Methods 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 7
- 238000011084 recovery Methods 0.000 claims description 7
- 238000007667 floating Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 235000013399 edible fruits Nutrition 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 238000007726 management method Methods 0.000 description 9
- 238000012423 maintenance Methods 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012772 sequence design Methods 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
Classifications
-
- 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
-
- H02J7/0026—
-
- 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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
Abstract
The invention discloses a kind of intelligent multichannels to use battery manager with, including Switching Power Supply, load of base station, lead-acid battery group, lithium battery power supply unit, DC bus, upper battery management system is assembled to each retired dynamic lithium battery and DC/DC converter forms lithium battery power supply unit, the control method of respective electric current output is controlled according to DC bus-bar voltage using each lithium battery power supply unit, communication base station is set to be powered by alternating current through Switching Power Supply load of base station and lead-acid battery in mains-supplied, all lithium battery groups are load of base station and lead-acid battery power supply simultaneously when alternating current power loss, all lithium battery power supply unit electricity by lead-acid battery group are individually for communication base station load supplying after exhausting；The Switching Power Supply input side is electrically connected with city, outlet side is connected with DC bus, and load of base station, lead-acid battery group and lithium battery power supply unit are connected in parallel to each other and are connected with DC bus.Invention additionally discloses a kind of control methods of lithium battery power supply unit, base station.
Description
Technical field
The present invention relates to a kind of intelligent multichannels to use battery manager, control method and base station with, belongs to communication base station technology
Field.
Background technique
As society tends to be information-based, ensure that the communication base station of information communication is further important.In design, engineers cause
How power research enables communication base station run steadily in the long term in the case where low cost.It is most logical for communication base station
Letter base station fault is all derived from its power supply system and goes wrong.Thus it is guaranteed that the equipment of communication base station will not be because of mains failure
And power off, do not generate failure because of power issue, become a main design object.
To realize that communication base station does not generate failure because of mains failure, need to make under alternating current power failure state, communication base station energy
The voltage met within the scope of its operating condition is provided for equipment in communication base station within the relatively long time, is able to achieve this function
Can battery thus become important component in communication base station power supply system.In order to reduce the cost of operation and maintenance,
Need to meet long service life and the requirement of this highly-safe two o'clock for the battery that communication base station is powered in alternating current power loss,
And there are the characteristics such as installation convenience.In existing design scheme, the normal standby electricity for selecting lead-acid battery to use as communication base station
Source.However, existing lead-acid battery operational version existing defects, i.e. lead-acid battery service life is shorter, and maintenance cost is high.Together
When, since communication base station frequently has a power failure, each power off time is long, it will cause lead-acid battery and frequently discharge, and in underfill electricity
In the case of discharge again, there is charge less, make lead-acid battery quick aging, further speeded up cell degradation, improve operation dimension
Protect cost.
In order to protect lead-acid battery, its quick aging is avoided, exists in existing technical solution and uses retired power lithium battery
Pond group echelon utilizes, the strategy being powered as backup power source auxiliary lead-acid battery.This scheme improves lead-acid battery mistake
After spending charge and discharge and charge less problem, other defect is also resulted in, including because there are performance differences between retired dynamic lithium battery group
And same discharge lower part battery group from over discharging, charge less are caused, control method is complicated, and multiple using communication bus control
Lithium battery group electric discharge leads to more and complicated system wiring, control flow complexity and communication bus anti-interference ability is weak, generates failure
The problems such as Shi Keneng hinders lithium battery group to discharge under alternating current power loss.
Summary of the invention
It is an object of the invention in view of the above-mentioned problems, proposing that a kind of intelligent multichannel uses battery manager with, from all lithiums
Battery power supply unit collaboration power supply angle set out, by retired dynamic lithium battery group final output to DC bus electric current with
Direct current bus bar pressure establishes linear relationship, makes more excellent compared to lead-acid battery group by lithium battery power supply unit under alternating current power failure state
First electric discharge guarantees communication base station powered stable, and makes DC bus-bar voltage in the model of lead-acid battery group float charge voltage to platform voltage
Enclose interior total energy output and the one-to-one constant current of real-time voltage, and the maximum by being directed to each retired dynamic lithium battery group
Electric current output determines the linear relationship of DC bus-bar voltage and each lithium battery power supply unit output electric current respectively, without using logical
Each lithium battery group is set to be discharged according to self-discharge ability on the basis of letter bus, and because collaboration electric discharge makes city power recovery
Lithium battery group can be faster fully charged afterwards, to solve between the frequent charge and discharge of communication base station lead-acid battery group, retired dynamic lithium battery group
Lithium battery group over-discharge in part caused by inconsistency, part lithium battery group underfill discharge again and lead to charge less, control method
Complicated, communication bus use cause wiring more and it is complicated the problems such as, the cost of reduction communication base station operation and maintenance better ensures that
Communication base station low cost stable operation.
The technical scheme adopted by the invention is as follows:
Intelligent multichannel uses battery manager, including Switching Power Supply, load of base station, lead-acid battery group, lithium battery power supply list with
Member, DC bus, the Switching Power Supply input side is electrically connected with city, outlet side is connected with DC bus, load of base station, plumbic acid electricity
Pond group and lithium battery power supply unit are connected in parallel to each other and are connected with DC bus, it is characterized in that: by giving retired dynamic lithium battery group
It mixes battery management system and DC/DC converter forms lithium battery power supply unit, each lithium battery power supply unit is according to direct current mother
Line voltage controls the output of respective electric current, make communication base station in mains-supplied by alternating current through Switching Power Supply load of base station and plumbic acid
Battery power supply, when alternating current power loss, all lithium battery power supply units were load of base station and lead-acid battery power supply, all lithium batteries simultaneously
Power supply unit electricity by lead-acid battery group is individually for communication base station load supplying after exhausting.
It is preferred that are as follows: the lead-acid battery group is connected with DC bus, as the backup power supply of the minimum communication base station of priority,
Usually charged by DC bus, be decreased obviously not yet in alternating current power loss moment DC bus-bar voltage, lithium battery power supply unit still
It is briefly DC bus and load of base station power supply when not powering, all lithium battery power supply units can not expire after alternating current power loss
It is DC bus powered when the power demands of sufficient DC bus.
It is preferred that are as follows: the Switching Power Supply being connected with alternating current and DC bus includes rectifier output voltage detection circuit, whole
Current circuit and its control circuit, by detecting to rectifier output voltage, adjustment control circuit output carries out rectification circuit
Control, to obtain standard compliant DC bus-bar voltage by commercial power rectification.
It is preferred that are as follows: the lithium battery power supply unit includes DC/DC converter, retired dynamic lithium battery group, lithium battery group electricity
It presses detection circuit, current detection circuit, battery management system (BMS), direct current bus voltage detecting circuit, DC bus exported
Current detection circuit, wherein DC/DC converter two sides are connected with DC bus and retired dynamic lithium battery group respectively, control and move back
Labour dynamic lithium battery group obtains electric energy charging from DC bus or to DC bus powered, battery management system and battery pack electricity
It presses detection circuit, battery pack current detection circuit to be connected, calculates the state-of-charge of retired dynamic lithium battery group according to testing result
Etc. status informations, while being connected with direct current bus voltage detecting circuit and to DC bus output current detection circuit, obtain straight
The current data that busbar voltage and lithium battery power supply unit are DC bus output is flowed, judges whether to allow retired dynamic lithium battery group
Charging is DC bus powered or cut off from DC bus, and generates control signal control DC/DC transformation according to judging result
Device, wherein be it is DC bus powered in the case where battery management system by read DC bus-bar voltage and control DC/DC transformation
Device provides the constant current output of appropriate current value for DC bus.
A kind of control method the present invention also provides lithium battery power supply unit based on droop method, this method are existed in alternating current
When, it is that all lithium battery power supply units charge by DC bus, after current lithium battery power supply unit is full of, is issued by BMS
Signal control DC/DC converter is controlled by retired dynamic lithium battery group and DC bus open circuit；It is all to connect in alternating current power loss
Lithium battery power supply unit on DC bus all accesses DC bus and is DC bus powered, same time all lithium batteries
Power supply unit according to the performance of itself there is different electric currents to export, and not be able to satisfy direct current mother in all lithium battery power supply units
Line need load of base station power demands when, be powered by lead-acid battery group for load of base station, while all lithium battery power supplies
Unit keep output be itself maximum can discharge current power supply pressure of the constant current output to mitigate lead-acid battery group, until all
Lithium battery power supply unit electricity is individually for communication base station load supplying by lead-acid battery group again after exhausting.
The lithium battery power supply unit carries out the communication between different lithium battery power supply units without using communication bus, uses
Identical control method and independent maximum can discharge current setting, realize wiring independence and control program can be independent
Work, have hardware connection and software control of both independence, reduce internal system wiring quantity, reduce system building at
This simultaneously simplifies follow-up system installation and maintenance work.
The present invention also provides a kind of controls of lithium battery power supply unit for using battery manager with using above-mentioned intelligent multichannel
Method.
The present invention also provides a kind of intelligent multichannel is used with battery manager and control method applied to communication base station.
Due to the application of the above technical scheme, compared with prior art, the present invention having following advantages and effect:
An effect of the invention is that intelligent multichannel uses battery manager with, can be by simultaneously using whole lithium electricity
Pond power supply unit is powered in alternating current power loss for load of base station, and the frequency of use of lead-acid battery group is greatly reduced, effectively reduces lead
The charge and discharge electric frequency of sour battery realizes the extension of lead-acid battery group service life.
An effect of the invention is that intelligent multichannel uses battery manager with, can pass through each lithium battery power supply list
In first according to its retired dynamic lithium battery group performance be independently arranged maximum can discharge current, and control lithium battery power supply unit in city
When carrying out constant current output according to DC bus-bar voltage when electric power loss output electric current by maximum can discharge current influenced and be no more than this
Certain value, make lithium battery power supply unit in charge and discharge process can according to self performance control power output speed, avoid because
Inconsistent lead to the retired dynamic lithium battery group mistake in part for the performance of dynamic lithium battery group retired in different lithium battery power supply units
Degree electric discharge.
An effect of the invention is that intelligent multichannel uses battery manager with, can be by making lithium battery power supply unit
Simultaneously to be DC bus powered, to an alternating current power loss to city power recovery during all lithium battery power supply unit electric energy storages
Reduction balanced, shorten the used time that all lithium battery power supply units refill electricity behind city power recovery, avoid city again
There is lithium battery power supply unit when electric because retired dynamic lithium battery group is not yet fully charged to cause charge less with regard to electric discharge.
An effect of the invention is that intelligent multichannel uses battery manager with, can make each lithium battery power supply unit
Between discharged according to self performance, make all lithium battery power supply units that there is approximate performance degradation rate, convenient for unified dimension
Shield and replacement, realize the reduction of communication base station maintenance cost.
An effect of the invention is that intelligent multichannel uses battery manager with, can correspond by using quantity
Relationship establishes simple DC/DC converter output control, keeps the control method of whole system simple and is easily achieved.
An effect of the invention is that intelligent multichannel uses battery manager with, can be by making lithium battery power supply unit
Control flow do not interfered by other other lithium battery power supply unit status informations, even if having lithium battery power supply list in the system of realization
Member is because of failure when can not be powered, remaining lithium battery power supply unit also normal power supply and can meet the power supply need of system
It asks.
An effect of the invention is that intelligent multichannel uses battery manager with, can be by making all lithium battery power supplies
The information that unit does not need other lithium battery power supply units can work normally, and realize lithium battery power supply unit independent patch, no
Using communication bus, system internal wiring is simple, reduces the cost of system, and be convenient for design, construction and the subsequent dimension of system
Nurse makees.
Detailed description of the invention
Fig. 1 is that intelligent multichannel uses communication base station multi-source collaboration electrical schematic under battery manager controls with；
Fig. 2 is that intelligent multichannel uses battery manager structural schematic diagram with；
Fig. 3 is switching power supply structure schematic diagram (control circuit is by taking PI is controlled as an example)；
Fig. 4 is single lithium battery power supply unit internal structure chart；
Fig. 5 is that system power flows to schematic diagram under mains-supplied；
Fig. 6 is that system power flows to schematic diagram under alternating current power loss lithium battery power supply；
Fig. 7 is DC bus-bar voltage and lithium battery power supply unit constant current output relation schematic diagram in droop method control；
Fig. 8 is control of discharge flow chart of the single lithium battery power supply unit based on droop method.
Specific embodiment
The present invention is described further with reference to the accompanying drawing.
Below in conjunction with the attached drawing of the embodiment of the present invention, technical solution in the embodiment of the present invention is described.It is retouched
The embodiment stated is a part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiments of the present invention, this field is general
Logical technical staff every other embodiment obtained without making creative work belongs to what the present invention protected
Range.
In order to facilitate understanding of embodiments of the present invention, it is further explained below in conjunction with attached drawing with specific embodiment
Bright, embodiment does not constitute the restriction to the embodiment of the present invention.
Embodiment 1
Fig. 1 is that intelligent multichannel uses communication base station multi-source collaboration electrical schematic under battery manager controls with, mainly includes
Alternating current, DC bus, load of base station, lead-acid battery group, lithium battery power supply unit, DC bus is as powering for load of base station
Power supply, energy source include through Switching Power Supply convert alternating current, lithium battery power supply unit and lead-acid battery group three, pass through by
Alternating current is converted to direct current as the main power supply source in base station, lithium battery power supply unit and lead-acid battery group through Switching Power Supply and makees
It for priority height and the minimum backup power source of priority, realizes on the basis of guaranteeing communication base station power demands, preferential use
Lithium battery power supply unit is common in alternating current power loss by all lithium battery power supply units as the power supply under alternating current power failure state
For load of base station power supply, the frequency of use of lead-acid battery is greatly reduced, effectively reduces the charge and discharge electric frequency of lead-acid battery, prolong
Long lead-acid battery group service life reduces the operation expense of communication base station power supply.
Fig. 2 is that intelligent multichannel uses battery manager structural schematic diagram with, mainly includes Switching Power Supply, load of base station, plumbic acid
Battery pack, DC bus and lithium battery power supply unit, the Switching Power Supply input side and city be electrically connected, outlet side and DC bus
It is connected, load of base station, lead-acid battery group and lithium battery power supply unit are connected in parallel to each other and are connected with DC bus, and wherein lithium battery supplies
The specific number of electric unit can be adjusted according to communication base station power demands, different lithium battery power supply units and DC bus
Wiring connection independently of one another, is independent of each other, the number of lithium battery power supply unit such as " lithium battery power supply unit 1 " only indicates in figure
Some any lithium battery power supply unit on DC bus is connect, does not represent the lithium battery power supply unit connecing on DC bus
Enter sequence or physical location arrangement information.
The lead-acid battery group is connected with DC bus, as the backup power supply of the minimum communication base station of priority, usually by
DC bus charging, alternating current power loss moment DC bus-bar voltage is decreased obviously not yet, lithium battery power supply unit is not yet powered
When be briefly DC bus and load of base station power supply, all lithium battery power supply units are unable to satisfy direct current after alternating current power loss
It is DC bus powered when the power demands of bus.
The structure of the Switching Power Supply being connected with alternating current and DC bus, as shown in figure 3, including that rectifier output voltage is examined
Slowdown monitoring circuit, rectification circuit and its control circuit, by detecting to rectifier output voltage, adjustment control circuit output is to rectification
Circuit is controlled, to obtain standard compliant DC bus-bar voltage by commercial power rectification, wherein control circuit in figure with than
Example integral (PI) control citing is illustrated, can also be using other control method such as proportional integral differential (PID) in actual design
The methods of control is designed.
The internal structure of the single lithium battery power supply unit, as shown in figure 4, including DC/DC converter, retired power lithium
Battery pack, lithium battery group voltage detecting circuit, current detection circuit, battery management system (BMS), DC bus-bar voltage detection electricity
Road, to DC bus output current detection circuit, DC/DC converter two sides respectively with DC bus and retired dynamic lithium battery group
It is connected, being responsible for converting to obtain through DC/DC by DC bus-bar voltage when for the charging of retired dynamic lithium battery group to be quickly retired
The permanent charging current voltage of dynamic lithium battery group charging, that is responsible for being judged according to BMS when to be DC bus powered should export
Constant current, the voltage transformation of retired dynamic lithium battery group is obtained to constant current power output is carried out to DC bus.Cell tube
Reason system is connected with battery voltage detection circuit, battery pack current detection circuit, calculates retired power lithium according to testing result
The status informations such as the state-of-charge of battery pack, while battery management system is also with direct current bus voltage detecting circuit and to direct current mother
Line output current detection circuit is connected, and the voltage and entire lithium battery power supply unit for obtaining DC bus are DC bus output
Current data (it is positive value that electric current, which is output to DC bus, and it is then negative value that electric current, which flows into lithium battery power supply unit), is patrolled according to judgement
Volume judge whether retired dynamic lithium battery group to be allowed to be charged by DC bus, be DC bus powered or from DC bus
Excision, and according to judging result generate control signal control DC/DC converter, wherein be it is DC bus powered in the case where battery
Management system is by reading DC bus-bar voltage and to control the constant current that DC/DC converter provides appropriate current value for DC bus defeated
Out.
Fig. 5 is that system power flows to schematic diagram under mains-supplied, as shown, in the case where alternating current normal power supply, directly
Stream bus is converted to standard compliant direct current through Switching Power Supply by alternating current and is powered.DC bus is load of base station power supply,
It and is lead-acid battery group and the charging of the lithium battery power supply unit of underfill electricity.Lead-acid battery group can always and directly because of floating charge characteristic
It flows bus to be connected, lithium battery power supply unit is after detecting that internal retired dynamic lithium battery group fills with electricity, cell tube
Reason system will automatically control DC/DC converter, lithium battery power supply unit be disconnected from the circuit that DC bus charges, to terminate
Charging process.
Fig. 6 is that system power flows to schematic diagram under alternating current power loss lithium battery power supply, as shown, the alternating current power loss the case where
Under, DC bus is powered jointly by the whole lithium battery power supply units being attached thereto.DC bus is from the lithium connect on it
Battery power supply unit obtains energy, and is load of base station power supply, is lead-acid battery charging.During this, lithium battery power supply list
Member is made whether electric discharge and whether stops the logic judgment of electric discharge by detection DC bus-bar voltage, and stops at city power recovery
The only discharge process of lithium battery power supply unit.
Due to being to control lithium battery power supply unit to export at current source, all lithium battery power supply units can be simultaneously to straight
Stream bus is powered, therefore during an alternating current power loss, the electric energy storage in all lithium battery power supply units has not
With the decline of degree, rather than the retired dynamic lithium battery group electric energy inside some or certain several lithium battery power supply units is substantially
Consumption, other lithium battery power supply units solve the retired dynamic lithium battery group over-discharge in part almost without electric energy loss
Problem, while during the lithium battery power supply unit that behind city power recovery DC bus is all less than electricity is charged, institute
There is the lithium battery power supply unit fully charged required time to substantially reduce, realizes to the retired dynamic lithium battery group underfill in part again
Electric discharge causes this kind of situation of charge less to avoid as far as possible, so that the service life of all lithium battery power supply units is effectively increased,
Guarantee the low cost stable operation of communication base station power supply system.
Lithium battery power supply unit can according to itself maximum can discharge current and DC bus real-time voltage change itself
Electric current output, realizes that each lithium battery power supply unit is discharged according to self-ability.It is common in all lithium battery power supply units
During power supply, by making each lithium battery power supply unit carry out power output according to itself real standard, all lithiums are realized
Battery power supply unit performance degradation speed is approximately equal, and all lithium battery power supply units terminate in the approximately uniform time using the longevity
It orders and is uniformly extractd and replaced, the cost of communication base station operation and maintenance can be effectively reduced.
Fig. 7 is DC bus-bar voltage and lithium battery power supply unit constant current output relation schematic diagram in droop method control, is such as schemed
Shown, the DC/DC converter output electric current i of lithium battery power supply unit is determined by DC bus-bar voltage u, and maintains itself always
Maximum can discharge current imaxLevel below, electric current when any lithium battery power supply unit is DC bus powered export control
Specifically includes the following steps:
A-1: in the presence of alternating current, DC bus-bar voltage is lead-acid battery group float charge voltage at this time, since alternating current exists, is not required to
Lithium battery power supply unit is wanted to export electric current, in the case where retired dynamic lithium battery group is fully charged, DC/DC converter exports electric current
I perseverance is 0；
A-2: when alternating current is not present, DC bus-bar voltage is in the range of lead-acid battery group float charge voltage is to platform voltage,
Since DC bus can not obtain electric energy from alternating current, needs to provide power output by lithium battery power supply unit, avoid lead-acid battery
Group preferential discharge, output electric current is 0, DC bus-bar voltage etc. when being equal to lead-acid battery group float charge voltage according to DC bus-bar voltage
When lead-acid battery group platform voltage export electric current be current lithium battery power supply unit maximum can discharge current quantitative relation, build
Vertical DC bus-bar voltage u exports electricity with the DC/DC converter of lithium battery power supply unit within the scope of float charge voltage to platform voltage
Flow i linear relationship as shown in Figure 7, control DC/DC converter DC bus-bar voltage within that range when be in DC bus
The original state of the state that voltage is lower, output electric current is higher, lithium battery power supply unit power supply can be because of DC bus output electricity
Power supply needs that are lower and being unable to satisfy load of base station are pressed, but under the collective effect of all lithium battery power supply units, system exists
It is always found in response process under some DC bus-bar voltage, all lithium battery power supply unit electric currents output summation be able to expire
The power demands of sufficient load of base station, whole system will be vibrated near this point and finally be stablized, and finally realize all lithiums
Battery power supply unit provides stable power output jointly for DC bus and load of base station；
A-3: when alternating current is not present, DC bus-bar voltage is lower than lead-acid battery group float charge voltage, lead-acid battery group into
Gone a large amount of electric discharge, in this case, lithium battery power supply unit need to do is to avoid as far as possible lead-acid battery group voltage because
It is reduced to its low cutoff voltage too quickly for electric discharge, and powers to full capacity for load of base station, therefore all lithiums in this state
Battery power supply unit all must can discharge current i with maximummaxConstant-current discharge is carried out, until lithium battery power supply unit voltage
Reach low cutoff voltage, for the purpose of protection system safety, DC/DC converter is controlled for lithium battery power supply unit by BMS
It is disconnected from DC bus.
Further, since the DC bus-bar voltage and lithium battery power supply unit that in the control of droop method, detect export
Electric current have one-to-one relationship, and due to DC bus-bar voltage be more than or equal to platform voltage when it is linear, be less than
Corresponding current is steady state value when platform voltage, and the one-to-one quantitative relation is easy to carry out table with functional form in a program
It reaches, so that the control method based on droop method is simple and is easily achieved.
Embodiment 2
As shown in figure 8, the identical control based on droop method design, control can be taken for any lithium battery power supply unit
Process processed specifically includes the following steps:
B-1: the battery management system (BMS) in lithium battery power supply unit reads direct current bus voltage detecting circuit and detects
DC bus-bar voltage data, judge DC bus-bar voltage (i.e. plumbic acid when whether DC bus-bar voltage is lower than alternating current normal power supply
Battery pack float charge voltage)；
B-2: alternating current do not power or lead-acid battery group underfill electricity and lithium battery power supply unit in retired dynamic lithium battery group
(DC bus-bar voltage is lower than lead-acid battery group float charge voltage, and retired dynamic lithium battery group voltage is greater than when can also continue to discharge
Its low cutoff voltage that can be discharged), bring the function of droop method into according to the DC bus-bar voltage that detection obtains, it is right therewith to find
That answers answers output constant current value, and BMS controls the constant current that DC/DC converter output size is the value, is embodied as DC bus confession
Electricity passes through measurement, calculating and the electricity shape for updating retired dynamic lithium battery group to battery pack current voltage while power supply
State, and return step B-1；
B-3: alternating current do not power or lead-acid battery group underfill electricity and lithium battery power supply unit in retired dynamic lithium battery group
(DC bus-bar voltage is lower than lead-acid battery group float charge voltage, retired power lithium when having had reached the limiting condition of self-discharge
Battery voltage reaches its low cutoff voltage that can be discharged), DC/DC converter is controlled for current lithium battery power supply list by BMS
Member is disconnected from DC bus, and return step B-1；
B-4: (DC bus-bar voltage is more than or equal to lead-acid battery group floating charging when mains-supplied and fully charged lead-acid battery group
Pressure), BMS judges the whether full electricity of current retired dynamic lithium battery group, controls DC/DC converter if discontented and charges, such as
Just control DC/DC converter disconnects retired dynamic lithium battery group and DC bus to the full electricity of fruit, after judging and executing command adapted thereto
Return step B-1.
Further, due to all general control flows as shown in Figure 8 of lithium battery power supply unit, not by other lithiums electricity
The interference of pond power supply unit state is broken down even if realizing individual lithium battery power supply units, other lithium battery power supply lists
Member still can normal power supply and meet communication base station load power demands.
Further, since all lithium battery power supply units use unified control method, and its control flow does not need
The status information of other lithium battery power supply units is obtained, it is achieved that all lithium battery power supply units independently connect in whole system
Line, autonomous working carry out data transmitting without using modes such as communication bus, and the wiring of whole system is simply clear, convenient for design
Construction and subsequent maintenance work.
Embodiment 3
By taking certain communication base station as an example, a specific embodiment of the invention is introduced.
The power supply system structure of the communication base station is as shown in Fig. 2, on DC bus other than load of base station and lead-acid battery
Separately it is connected to several lithium battery power supply units.Due to using the droop method that is not influenced by other lithium battery power supply unit status informations into
Row control, each lithium battery power supply unit is independently connected with DC bus and built-in identical control program, maximum can discharge electricity
Stream size is independently arranged according to self performance, does not use communication bus, and lithium battery power supply unit is in hardware connection level and journey
In sequence design level independently of one another.
Based on above-mentioned analysis, the intelligent multichannel of the communication base station uses the implementation method of battery manager with:
(1) in the presence of alternating current, it is transformed to meet the direct current of communication base station supply standard simultaneously through Switching Power Supply by alternating current
To be DC bus powered, DC bus is load of base station power supply, is that lead-acid battery group charges and lead-acid battery group is made to be in floating charge
State, DC bus be also it is all connect on DC bus but the lithium battery power supply unit of less than electricity charges, once lithium is electric
Battery management system (BMS) in the power supply unit of pond detects that current lithium battery power supply unit fills with electricity, then generates corresponding
Control signal is to cut off DC bus to the charge circuit of lithium battery power supply unit, and current direction is as shown in Figure 5 in whole system；
(2) alternating current power loss moment, DC bus-bar voltage is because lead-acid battery group voltage without substantially decaying, owns
Lithium battery power supply unit can not detect DC bus-bar voltage decline, at this time by lead-acid battery group be it is DC bus powered, directly
Bus is flowed for load of base station power supply；
(3) after alternating current power loss very short time, lead-acid battery group goes out due to for by floating charge state to be DC bus powered
Existing voltage decline, DC bus-bar voltage decline therewith, therefore lithium battery power supply unit can detecte DC bus-bar voltage decline,
All lithium battery power supply units start jointly to be DC bus powered, and all lithium battery power supply units are used as constant-current source to export,
And output electric current is influenced by DC bus-bar voltage as shown in fig. 7, the maximum of each lithium battery power supply unit can discharge current root
It is independently determined according to self performance, synchronization is that DC bus powered lithium battery power supply unit exports electric current by respective BMS
It is independently determined and is controlled with DC/DC converter, and may be exported according to respective retired dynamic lithium battery group performance difference
Size of current is different, and current direction is as shown in Figure 6 in whole system；
(4) after the alternating current power loss some time, due to the decaying of lithium battery power supply unit itself electric energy, lithium battery power supply is depended merely on
Unit collaboration power supply has been difficult to meet the power demands of entire communication base station, and DC bus-bar voltage is caused to fall to lead-acid battery group
Platform voltage is hereinafter, each lithium battery power supply unit maintains its maximum exportable electric current to carry out constant current output as shown in fig. 7, lead at this time
Therefore sour battery pack is also substantially discharged, meet the power demands of communication base station load as far as possible；
(5) behind city power recovery, restore to be converted to direct current through Switching Power Supply to by alternating current as DC bus powered, direct current is female
The case where line is load of base station power supply, is the state that lead-acid battery group charges, is restored to (1).
The foregoing description of the disclosed embodiments, being only used for professional and technical personnel in the field can be realized or use this hair
It is bright.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present invention, therefore sheet
Invention is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and innovative point phase
Consistent widest scope.
Claims (7)
1. intelligent multichannel uses battery manager with, including Switching Power Supply, load of base station, lead-acid battery group, lithium battery power supply unit,
DC bus, the Switching Power Supply input side is electrically connected with city, outlet side is connected with DC bus, load of base station, lead-acid battery
Group and lithium battery power supply unit are connected in parallel to each other and are connected with DC bus, it is characterized in that: by being assembled to retired dynamic lithium battery
Upper battery management system and DC/DC converter form lithium battery power supply unit, and each lithium battery power supply unit is according to DC bus
Voltage controls respective electric current output, keeps communication base station electric through Switching Power Supply load of base station and plumbic acid by alternating current in mains-supplied
Pond power supply, when alternating current power loss, all lithium battery power supply units were load of base station and lead-acid battery power supply simultaneously, and all lithium batteries supply
Electric unit electricity by lead-acid battery group is individually for communication base station load supplying after exhausting.
2. intelligent multichannel as described in claim 1 uses battery manager with, which is characterized in that the lead-acid battery group and direct current
Bus is connected, and as the backup power supply of the minimum communication base station of priority, is charged by DC bus, female in alternating current power loss moment direct current
It is briefly that DC bus and load of base station are powered when line voltage is decreased obviously not yet, lithium battery power supply unit is not yet powered,
It is DC bus powered when all lithium battery power supply units are unable to satisfy the power demands of DC bus after alternating current power loss.
3. intelligent multichannel as described in claim 1 uses battery manager with, which is characterized in that described and alternating current and DC bus
Connected Switching Power Supply includes rectifier output voltage detection circuit, rectification circuit and its control circuit, by rectification output electricity
Pressure is detected, and adjustment control circuit output controls rectification circuit, to be obtained by commercial power rectification standard compliant straight
Flow busbar voltage.
4. intelligent multichannel as described in claim 1 uses battery manager with, which is characterized in that the lithium battery power supply unit packet
Include DC/DC converter, retired dynamic lithium battery group, lithium battery group voltage detecting circuit, current detection circuit, battery management system
(BMS), direct current bus voltage detecting circuit, to DC bus output current detection circuit, wherein DC/DC converter two sides point
It is not connected with DC bus and retired dynamic lithium battery group, controls retired dynamic lithium battery group and obtain electric energy from DC bus and fill
Electricity or to DC bus powered, battery management system is connected with battery voltage detection circuit, battery pack current detection circuit, root
The state of charge information of retired dynamic lithium battery group is calculated according to testing result, while with direct current bus voltage detecting circuit and to straight
It flows bus output current detection circuit to be connected, obtains DC bus-bar voltage and lithium battery power supply unit is the electricity of DC bus output
Flow data, judge whether to allow retired dynamic lithium battery group charging, be DC bus powered or cut off from DC bus, and according to
Judging result generates control signal and controls DC/DC converter, wherein be it is DC bus powered in the case where battery management system it is logical
It crosses to read DC bus-bar voltage and control DC/DC converter and provides the constant current output of appropriate current value for DC bus.
5. using the control of the lithium battery power supply unit of battery manager with using the intelligent multichannel as described in claim 1-4 is any
Method, which is characterized in that the control method of the lithium battery power supply unit be based on droop method control, the droop method control be
It is that all lithium battery power supply units charge by DC bus in the presence of alternating current, after current lithium battery power supply unit is full of, by
BMS issues control signal control DC/DC converter for retired dynamic lithium battery group and DC bus open circuit；In alternating current power loss,
All lithium battery power supply units connect on DC bus all access DC bus and are DC bus powered, same time institute
There is lithium battery power supply unit according to the performance of itself to there is different electric currents to export, cannot expire in all lithium battery power supply units
Sufficient DC bus need load of base station power demands when, be powered by lead-acid battery group for load of base station, while all lithiums
Battery power supply unit keep output be itself maximum can discharge current power supply pressure of the constant current output to mitigate lead-acid battery group,
Communication base station load supplying is individually for by lead-acid battery group again after all lithium battery power supply unit electricity exhaust.
6. intelligent multichannel uses the control method of the lithium battery power supply unit of battery manager with according to claim 5, special
Sign is, can take the identical control based on droop method design for any lithium battery power supply unit, control process is specific
The following steps are included:
Step 1: the battery management system in lithium battery power supply unit reads the direct current that direct current bus voltage detecting circuit detects
Busbar voltage data judge DC bus-bar voltage when whether DC bus-bar voltage is lower than alternating current normal power supply；
Step 2: alternating current do not power or lead-acid battery group underfill electricity and lithium battery power supply unit in retired dynamic lithium battery group also
When can continue electric discharge, bring the function of droop method into according to the obtained DC bus-bar voltage of detection, find it is corresponding answer it is defeated
Constant current value out, BMS control the constant current that DC/DC converter output size is the value, are embodied as DC bus powered, are powering
While by measurement, calculating and the state of charge for updating retired dynamic lithium battery group to battery pack current voltage, and return
Step 1；
Step 3: alternating current do not power or lead-acid battery group underfill electricity and lithium battery power supply unit in retired dynamic lithium battery group
It is by BMS control DC/DC converter that current lithium battery power supply unit is female from direct current when through having reached the limiting condition of self-discharge
It is disconnected on line, and return step 1；
Step 4: when mains-supplied and fully charged lead-acid battery group, BMS judges the whether full electricity of current retired dynamic lithium battery group, such as
The discontented just control DC/DC converter of fruit charges, if full electricity just control DC/DC converter make retired dynamic lithium battery group and
DC bus disconnects, and judges and executes return step 1 after command adapted thereto.
7. a kind of communication base station, including battery manager, feature are used with using any intelligent multichannel of claim 1-4
Are as follows: the implementation method that the multichannel that the communication base station uses uses battery manager with includes following content:
(1) it in the presence of alternating current, is transformed to meet the direct current of communication base station supply standard through Switching Power Supply by alternating current and is straight
Bussed supply is flowed, DC bus is load of base station power supply, is that lead-acid battery group charges and lead-acid battery group is made to be in floating charge state,
DC bus be also it is all connect on DC bus but the lithium battery power supply unit of less than electricity charges, once lithium battery power supply
Battery management system in unit detects that current lithium battery power supply unit fills with electricity, then generates corresponding control signal to cut
Charge circuit of the disconnected DC bus to lithium battery power supply unit；
(2) alternating current power loss moment, for DC bus-bar voltage because lead-acid battery group voltage is without substantially decaying, all lithiums are electric
Pond power supply unit can not detect that DC bus-bar voltage declines, and at this time be DC bus powered, direct current mother by lead-acid battery group
Line is load of base station power supply；
(3) after alternating current power loss very short time, there is electricity due to for by floating charge state to be DC bus powered in lead-acid battery group
Drops, DC bus-bar voltage decline therewith, therefore lithium battery power supply unit can detecte DC bus-bar voltage decline, own
Lithium battery power supply unit starts jointly to be DC bus powered, and all lithium battery power supply units are used as constant-current source to export, and defeated
Electric current is influenced by DC bus-bar voltage out, the maximum of each lithium battery power supply unit can discharge current according to self performance independence
It determines, synchronization is that DC bus powered lithium battery power supply unit output electric current is only by respective BMS and DC/DC converter
It is vertical to be determined and controlled and different according to respective retired dynamic lithium battery group performance difference output size of current；
(4) after the alternating current power loss some time, due to the decaying of lithium battery power supply unit itself electric energy, lithium battery power supply unit is depended merely on
Collaboration power supply has been difficult to meet the power demands of entire communication base station, and DC bus-bar voltage is caused to fall to lead-acid battery group platform
Voltage hereinafter, each lithium battery power supply unit maintains its maximum exportable electric current to carry out constant current output at this time, discharge by lead-acid battery group,
Meet the power demands of communication base station load as far as possible；
(5) behind city power recovery, restore to by alternating current through Switching Power Supply be converted to direct current be it is DC bus powered, DC bus is
Load of base station power supply, for the state of lead-acid battery group charging, the case where being restored to above-mentioned (1).
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