CN112928804A - Battery difference-based uneven current discharge control method and system - Google Patents
Battery difference-based uneven current discharge control method and system Download PDFInfo
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- CN112928804A CN112928804A CN202110366054.XA CN202110366054A CN112928804A CN 112928804 A CN112928804 A CN 112928804A CN 202110366054 A CN202110366054 A CN 202110366054A CN 112928804 A CN112928804 A CN 112928804A
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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
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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
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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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Abstract
The invention discloses a method and a system for controlling uneven discharge based on battery difference, which comprises a system body, the system body comprises a communication bus, an alternating current power supply, a bus, a conversion module and an electric power storage module, the communication bus is electrically connected with a plurality of conversion modules, the conversion modules are all electrically connected with an electric storage module, the electric power storage module is also connected with a fuse in series, the conversion module at least comprises one of an AD/DC rectifying circuit or a DC/DC charging and discharging circuit, performance difference exists between every two storage batteries in the flexible direct-current communication power supply system, the residual electric quantity of every storage battery is calculated in real time, after the alternating current is lost, according to the situation of the residual electric quantity of the storage batteries, a control strategy that each storage battery discharges in a shunt way and the load is unevenly shared is adopted, all the storage batteries synchronously reach the discharge limit, and the time of the whole battery with the accident load is prolonged.
Description
Technical Field
The invention relates to the technical field of communication power supplies, in particular to a method and a system for controlling uneven current discharge based on battery difference.
Background
The multiple parallel modules share load current output in an average manner (parallel module current sharing for short) is a commonly used operation mode at present. By the method, overload of partial modules caused by uneven distribution of load current can be avoided, so that heat dissipation of the modules is influenced, the service life of the modules is shortened, and the reliability of a system is reduced.
The basic structure of the flexible communication direct-current power supply system is as follows: a single storage battery is connected with a parallel power supply conversion module through a fuse to form a parallel power supply assembly, and direct-current high-voltage output ends of modules in similar multiple assemblies are connected in parallel to form a direct-current power supply bus.
Under the normal operation mode of the flexible communication direct-current power supply system, alternating current AC220V is output to a direct-current bus through a parallel power supply conversion module AC/DC circuit and then is loaded, output current exchanges information of each module through a CAN communication bus, load current is evenly distributed among all components, and meanwhile, charging and discharging management is independently carried out on a 12V storage battery through the DC/DC circuit. When alternating current is lost, each storage battery outputs load current after passing through the DC/DC circuit, the load is averagely shared by the control of the current equalizing line, and the discharging current of each battery is the same. The schematic diagram of the output principle of the evenly distributed load current after the alternating current of the flexible communication direct current power supply system is lost is shown in figure 4.
The flexible direct current communication power supply system is composed of a parallel power supply assembly consisting of a 12V storage battery and a parallel power supply conversion module. The flexible direct current communication power supply system belongs to a parallel voting system, the total number of parallel power supply components is set to be n, the parallel power supply components with a certain basic number m are normal, the system can normally run, and the parallel power supply components (m-n) with the number larger than the basic number m are redundancy backup.
The flexible direct current communication power supply system supplies power to a communication load through alternating current power supply rectification when in normal, and the purpose of configuring the storage battery is to maintain the power supply time of an accident load as long as possible by means of battery discharge when alternating current is lost.
Because the batteries carried by each module of the flexible direct current communication power supply system are independently subjected to charge and discharge management during normal operation, the residual electric quantity and the health state of each battery have great difference. When alternating current is lost, each battery discharges with the same current, so that the battery with the minimum residual capacity inevitably exits from the discharging on-load operation, the accident current is evenly distributed among fewer and fewer batteries, the discharging current is increased inevitably to accelerate the batteries with the small residual capacity to exit from the discharging one by one until the parallel modules capable of discharging can be overloaded, and then the system stops operating completely. The battery current-sharing discharge strategy causes that when the system stops running completely, batteries in m parallel power supply assemblies which are used for supporting accident loads still have more undischarged electric quantity, the time of the whole battery with the accident loads is shortened, and the goal of prolonging the discharge time of the storage battery as far as possible in an accident cannot be realized. The schematic diagram of the problems caused by the fact that the storage battery distributes load current evenly after the flexible communication direct current power supply system loses power with alternating current is shown in figure 5.
Disclosure of Invention
The invention mainly aims to provide a method and a system for controlling uneven current discharge based on battery difference, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that: a non-uniform current discharge control system based on battery difference: the system comprises a system body, the system body comprises a communication bus, an alternating current power supply, a bus, a conversion module and an electric storage module, the communication bus is electrically connected with a plurality of conversion modules, the plurality of conversion modules are electrically connected with the electric storage module, the electric storage module is also connected with a fuse in series, and the conversion module at least comprises one of an AD/DC rectifying circuit and a DC/DC charging and discharging circuit.
Further: the conversion module is provided with an input switch and is electrically connected with an alternating current power supply through the input switch.
Further: the bus is provided with an output switch, and two ends of the output switch are respectively and electrically connected with the bus and the conversion module.
Further: the bus is also provided with a feeder switch, and the feeder switches are electrically connected with the bus.
Further, the uneven current discharge control method based on the battery difference comprises the following steps:
step S1, the conversion module detects whether the communication bus is idle, if yes, the next step is carried out, if not, the step S1 is repeated;
step S2: the transformation module sends self information to the communication bus;
step S3: the conversion module reads all information from the communication bus;
step S4: the transformation module determines the master machine by receiving the information of other transformation modules, and the other transformation modules are slave machines;
step S5: the main machine outputs bus voltage Ue in a voltage source mode, and the slave machine accurately adjusts discharging current output load of the electric storage module in a current source mode.
Further: in step S2, the self information includes at least one of a communication address, an output voltage, and an output current.
Further: in step S4, the information is a communication address, and the module with the smallest communication address is determined as the host.
Further: in step S5, each slave machine automatically adjusts the current on the output side of the module to load according to the output current calculated by the difference of the remaining power of the power storage module, and the load remaining current is borne by the master machine.
Further: the communication bus at least comprises one of a LIN bus, a CAN bus and an RS-485 bus.
Further: the power storage module includes at least one of a battery, a capacitor, and a UPS power source.
Compared with the prior art, the invention has the following beneficial effects: according to the method, the residual electric quantity of each storage battery is calculated in real time, and after alternating current is lost, a control strategy that each storage battery discharges in a shunt way and the load is unevenly shared is adopted according to the residual electric quantity condition of the storage batteries, so that all the storage batteries synchronously reach the discharge limit, and the time of the whole battery with accident load is prolonged.
After the flexible direct current communication power supply system loses power by alternating current, the battery discharges in a non-uniform mode according to the difference of the residual electric quantity of the battery, and a schematic diagram of the principle is shown in fig. 6.
After the flexible dc communication power supply system loses power by ac, the battery discharges current-inequality according to the difference of the remaining power of the battery until the optimal state that the system cannot be maintained is schematically shown in fig. 7.
Drawings
FIG. 1 is a schematic diagram of a system for controlling uneven current discharge based on battery differentiation according to the present invention;
FIG. 2 is a flow chart of a method for controlling uneven current discharge based on battery differentiation according to the present invention;
FIG. 3 is a logic diagram of a transformation module calculating a real-time remaining capacity of a single storage module electrically coupled thereto;
FIG. 4 is a schematic diagram of an average on-load discharging principle of a battery after the flexible DC communication power supply system loses AC power;
fig. 5 is a schematic diagram of residual electric quantity of m basic storage batteries after the flexible direct-current communication power supply system loses alternating current and the batteries evenly distribute load current and discharge until the system cannot operate;
FIG. 6 is a schematic diagram of a non-uniform current discharging principle of a battery according to a difference of remaining battery power after the flexible DC communication power supply system loses AC power;
fig. 7 is a schematic diagram illustrating an optimal state in which the battery is discharged to an extent that the system cannot be maintained according to the difference of the remaining battery capacity when the flexible dc communication power supply system loses ac power.
In the figure: 1. a feeder switch; 2. an output switch; 3. an input switch; 4. an electric storage module; 5. a fuse; 6. a transformation module; 7. a bus bar; 8. a communication bus; 9. an alternating current power supply.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.
As shown in fig. 1, the present invention provides a non-uniform current discharge control system based on battery difference, which includes a system body, wherein the system body includes a communication bus 8, an alternating current power supply 9, a bus 7, a conversion module 6 and an electric storage module 4, the communication bus 8 is electrically connected to a plurality of the conversion modules 6, the plurality of the conversion modules 6 are electrically connected to the electric storage module 4, the electric storage module 4 is also connected in series to a fuse 5, and the conversion module 6 at least includes one of an AD/DC rectifier circuit or a DC/DC charging and discharging circuit. The electric power storage module 4 stores electric charge when being externally connected with power supply equipment, and outputs electric charge when not being externally connected with the power supply equipment.
The conversion module 6 is provided with an input switch 3, and the conversion module 6 is electrically connected with an alternating current power supply 9 through the input switch 3.
The bus 7 is provided with an output switch 2, and two ends of the output switch 2 are respectively and electrically connected with the bus 7 and the conversion module 6.
The bus 7 is further provided with a feeder switch 1, and the feeder switches 1 are electrically connected with the bus 7.
A non-uniform current discharge control method based on battery difference comprises the following steps:
step S1: the conversion module 6 detects whether the communication bus 8 is idle at regular intervals, if so, the next step is carried out, and if not, the step S1 is repeated;
step S2: the transformation module 6 sends information to the communication bus 8, wherein the information comprises a communication address, an output voltage and an output current;
step S3: the conversion module 6 reads all information from the communication bus 8;
step S4: the transformation module 6 determines the master machine by receiving the information of other transformation modules 6, and the other transformation modules 6 are slave machines;
step S5: the master machine outputs the bus 7 voltage Ue in a voltage source mode, and the slave machine accurately adjusts the discharging current output load of the electric storage module 4 in a current source mode.
Specifically, in step S2, the self information includes at least one of a communication address, an output voltage, and an output current.
Specifically, in step S4, the information is a communication address, and the module with the smallest communication address is determined as the host.
Specifically, in step S5, each slave automatically adjusts the current on the output side of the module to be charged according to the output current calculated by the difference of the remaining capacity of the power storage module 4, and the residual current of the load is borne by the master.
Optionally, the communication bus 8 comprises at least one of a LIN bus, a CAN bus and an RS-485 bus.
Alternatively, the power storage module 4 includes at least one of a storage battery, a capacitor, and a UPS power source.
In order to achieve the goal that the discharging and power supplying time of the power storage module 4 is longest under the condition of alternating current power loss of the flexible direct current communication power supply system, a hardware control strategy and a software calculation strategy are started.
And (3) hardware control strategy:
(1) the purpose of the CAN communication bus between the conversion modules 6 is changed, and the CAN communication bus is used for determining and adjusting the sizes of the master machine and the slave machine and the sizes of the output currents of the slave machine in differential discharge.
(2) Each conversion module 6 detects the CAN bus to be idle at certain intervals, and sends 'communication address, output voltage and output current' to the CAN bus.
(3) Each conversion module 6 reads all information from the CAN bus, the conversion module 6 with the minimum communication address is determined as a master, and the other conversion modules 6 are slaves.
(4) The master machine outputs communication direct current bus voltage Ue in a voltage source mode, and the slave machine accurately adjusts discharging current output loading of the electric storage module 4 in a current source mode.
(5) And each slave machine automatically adjusts the current on the output end of the module to load according to the output current calculated by the residual electric quantity difference of the electric storage module 4, and the residual current of the load is borne by the host machine.
The logic diagram of the parallel power supply module for judging whether the power supply module is the master or the slave is shown in figure 2.
Uneven discharge current calculation strategy based on battery difference:
(1) each conversion module 6 takes the last connected full-capacity data of a single power storage module 4 as initial electric quantity Q0(i), i is the number of the power storage module 4, and the number of the power storage modules 4 in the system is n, i is 1,2, … n.
Let i (i), i ═ 1,2, … n, be the discharge current of each power storage module 4 allocated according to the different remaining capacities of the power storage modules 4
(2) When the ac power supply 9 is normal, the conversion module 6 calculates the charge and discharge capacity of each power storage module 4 in real time at a certain interval time t, and obtains the real-time remaining capacity qt (i) ═ Q0(i) ± Δ Q (i), where Δ Q (i) ═ it (i) × t, i ═ 1,2, … n of each power storage module 4.
(3) Neglecting the impact load influence in the accident current, assuming that the total accident current is Isg (unit a) and the operation time of the load requiring discharge support of the power storage module 4 is Tsg (unit h), the total electric quantity Q required by the accident load is Isg × Tsg (unit Ah);
(3) the ideal state that we expect is that all the power storage modules 4 reach the discharge limit at the time of the accident discharge time Tsg, that is, all the power storage modules 4 are discharged at the same time.
Q total ═ Isg × Tsg ═ Qt (1) + Qt (2) + … Qt (n) ═ I (1) × Tsg + I (2) × Tsg + … + I (n) × Tsg
That is, each branch electric storage module 4 is discharged in the constant current mode, and the discharge current i (i) qt (i) ÷ Tsg.
The parallel power supply module calculates a discharge current calculation logic diagram of the single electric storage module 4 according to the difference of the residual electric quantity of the electric storage module 4, and the calculation logic diagram is shown in fig. 3.
Compared with the prior art, performance difference exists between every battery in the flexible direct current communication power supply system, the control strategy that after alternating current is lost, according to the situation of the residual capacity of the battery, the shunt discharging of every battery is adopted, and the load is unevenly shared is adopted, so that all the batteries synchronously reach the discharge electrode limit, and the time of the whole battery with accident load is prolonged.
The invention has been described above with reference to embodiments thereof. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the invention, and these alternatives and modifications are intended to be within the scope of the invention.
Claims (10)
1. A uneven current discharge control system based on battery difference is characterized in that: the system comprises a system body, wherein the system body comprises a communication bus, an alternating current power supply, a bus, a conversion module and an electric storage module, the communication bus is electrically connected with a plurality of conversion modules, the conversion modules are electrically connected with the electric storage module, the electric storage module is also connected with a fuse in series, and the conversion module at least comprises one of an AD/DC rectifying circuit and a DC/DC charging and discharging circuit.
2. The system according to claim 1, wherein: the conversion module is provided with an input switch and is electrically connected with an alternating current power supply through the input switch.
3. The system according to claim 1, wherein: the bus is provided with an output switch, and two ends of the output switch are respectively and electrically connected with the bus and the conversion module.
4. The system according to claim 1, wherein: the bus is also provided with a feeder switch, and the feeder switches are electrically connected with the bus.
5. A method for controlling uneven current discharge based on battery difference is characterized by comprising the following steps:
step S1, the conversion module detects whether the communication bus is idle, if yes, the next step is carried out, if not, the step S1 is repeated;
step S2: the transformation module sends self information to the communication bus;
step S3: the conversion module reads all information from the communication bus;
step S4: the transformation module determines the master machine by receiving the information of other transformation modules, and the other transformation modules are slave machines;
step S5: the main machine outputs bus voltage Ue in a voltage source mode, and the slave machine accurately adjusts discharging current output load of the electric storage module in a current source mode.
6. The method of claim 5, wherein the step of controlling the uneven current discharge based on the battery difference comprises: in step S2, the self information includes at least one of a communication address, an output voltage, and an output current.
7. The method of claim 5, wherein the step of controlling the uneven current discharge based on the battery difference comprises: in step S4, the information is a communication address, and the module with the smallest communication address is determined as the host.
8. The method of claim 5, wherein the step of controlling the uneven current discharge based on the battery difference comprises: in step S5, each slave machine automatically adjusts the current on the output side of the module to load according to the output current calculated by the difference of the remaining power of the power storage module, and the load remaining current is borne by the master machine.
9. The system according to claim 1, wherein: the communication bus at least comprises one of a LIN bus, a CAN bus and an RS-485 bus.
10. The system according to claim 1, wherein: the power storage module includes at least one of a battery, a capacitor, and a UPS power source.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110366054.XA CN112928804A (en) | 2021-04-06 | 2021-04-06 | Battery difference-based uneven current discharge control method and system |
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| CN202110366054.XA CN112928804A (en) | 2021-04-06 | 2021-04-06 | Battery difference-based uneven current discharge control method and system |
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| CN202110366054.XA Pending CN112928804A (en) | 2021-04-06 | 2021-04-06 | Battery difference-based uneven current discharge control method and system |
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