CN110445205A - A kind of DC power supply balanced management system and control method - Google Patents
A kind of DC power supply balanced management system and control method Download PDFInfo
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- CN110445205A CN110445205A CN201910683750.6A CN201910683750A CN110445205A CN 110445205 A CN110445205 A CN 110445205A CN 201910683750 A CN201910683750 A CN 201910683750A CN 110445205 A CN110445205 A CN 110445205A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The present invention relates to a kind of DC power supply balanced management system and control methods, including DC power supply, acquisition module, balance module, control module, calculation process module.Acquisition module carries out precise acquisition to the voltage, electric current, temperature of DC power supply, by the start and stop of calculation process module and control module control balance module, realizes and controls the closed loop voltage of DC power supply.Balance module includes main control module with from control module, and main control module completes electric voltage equalization between battery pack, and it is balanced to complete monomer voltage from control module.Control module includes comparing element, time delay process, interlocking link, can guarantee the problem of frequent switching will not occur and work at the same time between boosting, decompression mode.The present invention can be realized the electric voltage equalization in DC power supply normal course of operation between each monomer, and it can be when there is open circuit fault in monomer, still can stabilized power supply output voltage, the safe and stable operation of transforming plant DC power supply, power supply for electric vehicle, UPS backup power source is provided safeguard.
Description
Technical field
The invention belongs to power supply equalization field, it is related to a kind of DC power supply balanced management system and control method.
Background technique
At this stage, demand of the various circles of society to DC power supply is skyrocketed through, lithium battery group, power transformation in such as electric car
Plumbic acid DC power supply, UPS backup power source in standing etc..By taking transforming plant DC power-supply system as an example, mainly by lead-acid battery
Composition, because its battery component is in acidity, battery core is often broken because of aging, sour corrosion lead-acid battery, is caused entire straight
Galvanic electricity source is broken down because of open circuit, loses load capacity, improves the failure rate and maintenance cost of transformer station direct current system, drop
The operational reliability of Di Liao substation.On the other hand, because there are inconsistency, longtime running be will lead between each monomer of DC power supply
Inconsistency is further exacerbated by, and DC power source capacity is caused sharply to decline, while greatly reducing the load capacity of DC power supply
With service life.
It mainly include at present active equalization mode and passive balanced way to the balanced management system of DC power supply, wherein by
Cost is relatively low, principle is simply easily achieved for dynamic balanced way, but its stability is poor and has higher consumption to the electric energy of power supply.
Active equalization mode is electric voltage equalization between monomer to be carried out by the energy-storage travelling wave tubes such as step-up/step-down circuit or capacitor, inductance, but it is main
It has the following problems:
(1) it is only capable of balanced battery core both end voltage under normal operating conditions, do not can solve because the failures such as battery core fracture cause
The problem of transforming plant DC supply voltage is lost；
(2) it is only capable of moving by adjacent cell monomer progress energy, when inconsistency is stronger between DC power supply monomer, electricity
Press portfolio effect poor；
(3) control method of balance system there are problems that generating malfunction or boosting, decompression frequent switching vulnerable to disturbance.
Therefore, it is necessary to a kind of new technical solutions to solve the above problems.
Summary of the invention
In order to solve the above-mentioned technical problem, the invention proposes a kind of DC power supply balanced management system and control method,
Suitable for the accumulator direct current supply of multiple material, the voltage that can be realized in DC power supply normal course of operation between each monomer is equal
Weighing apparatus, and can when there is open circuit fault in monomer, still can stabilized power supply output voltage, to transforming plant DC power supply, electronic vapour
Power supply on vehicle, backup power source safe and stable operation provide safeguard.
The technical scheme adopted by the invention is that:
A kind of DC power supply balanced management system characterized by comprising
DC power supply: for powering to whole system；
And it is sequentially connected
Acquisition module: for sampling each monomer euqalizing current of DC power supply, end voltage, temperature；
Balance module: for constituting DC power supply balanced energy access；
Control module: the switching device for controlling in balance module is cut-off, and realizes Balance route strategy；
Calculation process module: it is used for operation sampled data, is compared judgement.
In a kind of above-mentioned DC power supply balanced management system, the acquisition module include high range current sensor,
The range of direct current power source voltage monomer acquisition module, temperature sensor, the high range current sensor is sent out according to DC power supply
Maximum euqalizing current setting when raw open circuit.
In a kind of above-mentioned DC power supply balanced management system, the DC power supply battery core includes lead-acid accumulator or phosphorus
Sour lithium iron battery or ternary lithium battery；The DC power supply is divided into N number of mould group, and each mould group includes n battery cell；
The N number of mould group of DC power supply constitutes series loop, to load supplying.
In a kind of above-mentioned DC power supply balanced management system, the balance module include: main control module and it is several from
Control module；
The master control is parallel to DC power supply both ends with from control module, wherein main control module parallel connection and each mould group two
End, for the electric voltage equalization between each mould group；From control wired in parallel in every batteries monomer both ends, for the voltage between each monomer
It is balanced；Master control and from relationship connectionless between control；
The main control module includes N number of BUCK-BOOST lifting piezoelectricity of high-power switch device and diode composition
Road, wherein diode inverse parallel is connected in parallel in adjacent respectively in high-power switch device both ends, every road step-up/step-down circuit both ends
Two battery modules both ends carry out electric voltage equalization by the energy flow between N group adjacent cell mould group；
Described includes the road n-1 equalizing circuit from control module, and every road equalizing circuit includes 2 high power switch devices
Part and 2 low conduction voltage drop Schottky diodes, wherein diode inverse parallel is in high-power switch device both ends；The equilibrium
Circuit both ends are connected to battery cell both ends and DC bus positive and negative anodes.
A kind of control method of DC power supply balanced management system, which is characterized in that control method is voltage close loop control,
It specifically includes:
The average value of every group of battery voltage in N group battery pack is calculated in calculation process module, and is input to control mould
Block, control module include；
Comparing element: doing subtraction to every group of average voltage and accordingly from the battery cell voltage of control equalizing circuit one end,
The two difference is compared with the balancing error threshold of setting, if more than setting threshold, number 1 is input to time delay process；
If being less than setting threshold, number 0 is input to time delay process；
Time delay process: it is greater than the delay of high-power switch tube switch periods by setting one, is obtained according to comparing element
Number judged, if comparing element persistently inputs number 1, show system mode setting delay time within the scope of, then start
Equalizing circuit carries out electric voltage equalization, battery cell and DC bus to respective battery monomer and constitutes bidirectional energy via balance module
Access；If being unsatisfactory for above-mentioned condition, do not start equalizing circuit；
It interlocks link: complementary control being carried out to power switch tube, guarantees that equalizing circuit only operates in liter when monomer is under-voltage
Pressing mold state only operates in decompression mode in monomer over-voltage.
In the present invention, DC power supply balanced management system includes working voltage equilibrium double mode balanced with failure, can
It is balanced that output voltage stabilization is carried out under the fault condition that monomer open circuit occurs for DC power supply.
The invention has the advantages that can be realized the electric voltage equalization in DC power supply normal course of operation between each monomer, and can be
When there is open circuit fault in monomer, still can stabilized power supply output voltage, to transforming plant DC power supply, power supply for electric vehicle, UPS
The safe and stable operation of backup power source provides safeguard.
Detailed description of the invention
Fig. 1 is system structure diagram of the invention.
Fig. 2 is balance module structural block diagram of the invention.
Fig. 3 is balance module main control module circuit diagram of the invention.
Fig. 4 a be balance module of the invention from control module diagram.
Fig. 4 b be balance module of the invention from control module circuit schematic.
Fig. 5 is control module block diagram of the invention.
Specific embodiment
Understand for the ease of those of ordinary skill in the art and implement the present invention, with reference to the accompanying drawings and embodiments to this hair
Bright to be described in further detail, the present embodiment is straight made of the 24 section lead-acid accumulators of 100Ah are monomer series-connected with a 48V
For galvanic electricity source, a kind of DC power supply balanced management system disclosed by the invention and control method are described in detail, it should
Understand, implementation example described herein only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention, other capacity or
Different types of DC power supply can be used as balanced object of the invention.
Referring to Fig.1, the DC power supply can be lead-acid batteries, lithium iron phosphate storage battery group, ternary lithium battery group,
And it is not limited to the battery group of mentioned kind.The acquisition module can be realized to DC power supply total voltage, total current, more
The precise acquisition of point temperature and monomer both end voltage, acquisition module one end are electrically connected with each monomer of DC power supply respectively, separately
One end is electrically connected with calculation process module, and acquisition module uses TI company bq76pl455EVM acquisition chip.The wide range
Current sensor model ACS758xCB.Calculation process module, control module and the balance module is electrically connected.
The calculation process module using TI company TMS320F28335 type dsp chip.It can be realized defeated to acquisition system
Enter the processing, operation and the realization of control program of data.
See Fig. 2, the balance module includes main control module with from control module, and the present embodiment is by 24 sections of DC power supply
Battery cell is divided into 4 groups, and every group includes 6 batteries monomers, carries out balanced management, 6 batteries to 6 batteries monomers from control module
One Pack of monomer composition, main control module carry out balanced management to four Pack.The main control module is electrically connected with DSP
It connects.
See Fig. 3, the main control module realizes the Balance route of intermodule using BUCK-BOOST equilibrium topological structure.
BUCK-BOOST equilibrium topological structure is simple with structure, reliability is higher and scalability is strong, is used for main control module energy
The balanced extension easy to accomplish from control module.Each adjacent two battery pack uses a BUCK-BOOST balanced unit circuit, can
Realize the Two-way energy transfer between adjacent cell group.BUCK-BOOST balanced unit circuit in parallel is in two adjacent battery packs
Between, it is made of two inductance, two switch mosfets and two diodes.MOSFET is using IXTP200N055T2
Model, diode is using 242NQ030 type Schottky diode.Inductance value principle is referring to formula 1 to formula 3, wherein UiWith Uo
Respectively battery cell voltage-to-ground and DC bus-bar voltage, Δ iLFor the current ripple level for flowing through inductance.D is switching tube duty
Than T is switching tube switch periods:
Wherein PacknFor the battery pack of 6 batteries monomer compositions.PWM control switch S is exported by controllernaAnd SnbIt is real
Two-way energy transfer between existing two neighboring battery pack.Principle is as follows:
Work as PacknVoltage ratio Packn+1Gao Shi uses PWM wave driving switch Sna, by PacknElectricity be transferred to
Packn+1In:
(1) closure switch Sna, PacknIt generates electric current and flows through Ln, PacknElectric discharge, inductance L1Energy storage.
(2) switch S is disconnectedna, inductance LnIn energy transfer to Packn+1, Packn+1Charging.
Work as PacknVoltage ratio Packn+1When low, PWM wave driving switch S is usedna, by Packn+1Electricity be transferred to
PacknIn:
(1) closure switch Snb, Packn+1It generates electric current and flows through L1, Packn+1Electric discharge, inductance LnEnergy storage.
(2) switch S is disconnectednb, inductance LnIn energy transfer to Packn, PacknCharging.
It is described to connect battery pack, side connecting single batteries from control module side see Fig. 4.Its circuit topology is as schemed
Shown in 4b, it is made of inductance, two metal-oxide-semiconductors and two diodes, MOSFET is using IXTP200N055T2 model, and two
Pole pipe is using 242NQ030 type Schottky diode.Wherein CellnFor any battery cell, Pack is by remaining all electricity
Pond monomer composition.PWM control switch S is exported by controllernaAnd SnbRealize battery cell CellnEnergy between battery pack
Measure bi-directional.
Work as CellnVoltage ratio Pack average voltage it is high when, use PWM wave driving switch Sna, by CellnElectricity turn
It moves on in Pack:
(1) closure switch Sna, CellnIt generates electric current and flows through L1, CellnElectric discharge, inductance L1Energy storage.
(2) switch S is disconnectedna, inductance L1In energy transfer give Pack, Pack charging.
Work as CellnVoltage ratio Pack average voltage it is low when, use PWM wave driving switch Snb, the electricity of Pack is turned
Move on to CellnIn:
(1) closure switch Snb, Pack generate electric current flow through L1, Pack electric discharge, inductance L1Energy storage.
(2) switch S is disconnectednb, inductance L1In energy transfer to Celln, CellnCharging.
See Fig. 5, wherein UjIndicate the battery cell voltage collected by the acquisition module, UaIndicate one
The average value of cell voltage in Pack, Error indicate UjWith UaBetween difference absolute value.The calculation process module calculates
The average value of every group of battery voltage in N group battery pack is obtained, and is input to the control module, the control module packet
Include comparing element, time delay process, interlocking link.The comparing element to every group of average voltage with accordingly from control equalizing circuit
The battery cell voltage of one end does subtraction, and the two difference is compared with the balancing error threshold of setting, if more than setting fault
Number 1 is input to time delay process by value；If being less than setting threshold, number 0 is input to time delay process.The time delay process
It is greater than the delay of high-power switch tube switch periods by setting one, the order number obtained according to comparing element is sentenced
It is disconnected, if comparing element persistently inputs command number 1 within the scope of setting delay time, show system mode in setting delay time
In range, then the PWM wave that a duty ratio is D is generated to start equalizing circuit by PI closed-loop control, start equalizing circuit pair
Respective battery monomer carries out electric voltage equalization, battery cell and DC bus and constitutes bidirectional energy access via balance module；If no
Meet above-mentioned condition, does not then start equalizing circuit.The interlocking link carries out complementary control to power switch tube, guarantees balanced
Circuit only operates in boosting mode when monomer is under-voltage, only operates in decompression mode in monomer over-voltage.
When the present embodiment is in use, the electric voltage equalization in DC power supply normal course of operation between each monomer is realized, and can
When there is open circuit fault in monomer, still can stabilized power supply output voltage, to transforming plant DC power supply, power supply for electric vehicle,
The safe and stable operation of UPS backup power source provides safeguard.
Although this specification has more used the arts such as acquisition module, calculation process module, time delay process, balance module
Language, but a possibility that be not precluded using other terms.It is of the invention the use of these items is only for more easily describing
Essence, being construed as any additional limitation is disagreed with spirit of that invention.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
It should be understood that the above-mentioned description for preferred embodiment is more detailed, can not therefore be considered to this
The limitation of invention patent protection range, those skilled in the art under the inspiration of the present invention, are not departing from power of the present invention
Benefit requires to make replacement or deformation under protected ambit, fall within the scope of protection of the present invention, this hair
It is bright range is claimed to be determined by the appended claims.
Claims (5)
1. a kind of DC power supply balanced management system characterized by comprising
DC power supply: for powering to whole system；
And it is sequentially connected
Acquisition module: for sampling each monomer euqalizing current of DC power supply, end voltage, temperature；
Balance module: for constituting DC power supply balanced energy access；
Control module: the switching device for controlling in balance module is cut-off, and realizes Balance route strategy；
Calculation process module: it is used for operation sampled data, is compared judgement.
2. a kind of DC power supply balanced management system according to claim 1, which is characterized in that the acquisition module packet
High range current sensor, direct current power source voltage monomer acquisition module, temperature sensor are included, the high range current sensor
Maximum euqalizing current when open circuit occurs according to DC power supply for range is arranged.
3. a kind of DC power supply balanced management system according to claim 1, which is characterized in that the DC power supply electricity
Core includes lead-acid accumulator or ferric phosphate lithium cell or ternary lithium battery；The DC power supply is divided into N number of mould group, Mei Gemo
Group includes n battery cell；The N number of mould group of DC power supply constitutes series loop, to load supplying.
4. a kind of DC power supply balanced management system according to claim 1, which is characterized in that the balance module packet
Include: main control module and it is several from control module；
The master control is parallel to DC power supply both ends with from control module, wherein main control module parallel connection and each mould group both ends,
For the electric voltage equalization between each mould group；It is equal for the voltage between each monomer from control wired in parallel in every batteries monomer both ends
Weighing apparatus；Master control and from relationship connectionless between control；
The main control module includes N number of BUCK-BOOST step-up/step-down circuit of high-power switch device and diode composition,
Middle diode inverse parallel is connected in parallel in two neighboring electricity in high-power switch device both ends, every road step-up/step-down circuit both ends respectively
Chi Mo group both ends carry out electric voltage equalization by the energy flow between N group adjacent cell mould group；
It is described from control module include the road n-1 equalizing circuit, every road equalizing circuit include 2 high-power switch devices with
2 low conduction voltage drop Schottky diodes, wherein diode inverse parallel is in high-power switch device both ends；The equalizing circuit
Both ends are connected to battery cell both ends and DC bus positive and negative anodes.
5. a kind of control method of DC power supply balanced management system described in claim 1, which is characterized in that control method is
Voltage close loop control, specifically includes:
The average value of every group of battery voltage in N group battery pack is calculated in calculation process module, and is input to control module, control
Molding block includes；
Comparing element: subtraction is done to every group of average voltage and accordingly from the battery cell voltage of control equalizing circuit one end, by two
Person's difference is compared with the balancing error threshold of setting, and if more than setting threshold, number 1 is input to time delay process；If small
In setting threshold, number 0 is input to time delay process；
Time delay process: it is greater than the delay of high-power switch tube switch periods, the number obtained according to comparing element by setting one
Word is judged, if comparing element persistently inputs number 1, shows that system mode within the scope of setting delay time, then starts equilibrium
It is logical via balance module composition bidirectional energy that circuit carries out electric voltage equalization, battery cell and DC bus to respective battery monomer
Road；If being unsatisfactory for above-mentioned condition, do not start equalizing circuit；
It interlocks link: complementary control being carried out to power switch tube, guarantees that equalizing circuit only operates in boosting mould when monomer is under-voltage
State only operates in decompression mode in monomer over-voltage.
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| TWI766718B (en) * | 2021-06-08 | 2022-06-01 | 龍華科技大學 | Battery module that can actively balance battery voltage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI766718B (en) * | 2021-06-08 | 2022-06-01 | 龍華科技大學 | Battery module that can actively balance battery voltage |
| CN114142565A (en) * | 2021-11-30 | 2022-03-04 | 湖北亿纬动力有限公司 | Battery pack equalization control system and control method and battery pack |
| CN114142565B (en) * | 2021-11-30 | 2024-01-02 | 湖北亿纬动力有限公司 | Balanced control system and control method of battery pack and battery pack |
| CN114530637A (en) * | 2022-02-24 | 2022-05-24 | 广州菲利斯太阳能科技有限公司 | Voltage balancing device and control method for series lithium battery pack |
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