CN107351710A - The determination method of capacitance group minimum capacitance in a kind of bidirectional DC/DC electricity electric mixed dynamic system of discharge and recharge and the system - Google Patents
The determination method of capacitance group minimum capacitance in a kind of bidirectional DC/DC electricity electric mixed dynamic system of discharge and recharge and the system Download PDFInfo
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- CN107351710A CN107351710A CN201710582532.4A CN201710582532A CN107351710A CN 107351710 A CN107351710 A CN 107351710A CN 201710582532 A CN201710582532 A CN 201710582532A CN 107351710 A CN107351710 A CN 107351710A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/40—Electric propulsion with power supplied within the vehicle using propulsion power supplied by capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2210/00—Converter types
- B60L2210/10—DC to DC converters
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention provides a kind of bidirectional DC/DC electricity electric mixed dynamic system of discharge and recharge, the hybrid power system includes load system, battery modules and capacitance group, the battery modules and capacitance group are arranged in parallel with load system and powered jointly to load system, also include a bidirectional DC/DC converter, the capacitance group is connected by the bidirectional DC/DC converter with battery modules, the positive terminal of the load system is provided with a current limiting system, the battery modules and bidirectional DC/DC converter and is connected by the current limiting system with load system.
Description
Technical field
The present invention relates to electric electricity mixed power technology, bidirectional DC/DC-electricity electricity mixing more particularly to a kind of discharge and recharge is dynamic
The determination method of capacitance group minimum capacitance in Force system and the system.
Background technology
In energy conserving system, bidirectional DC-DC converter (Bi-Directional direct current- are often used
Direct current converter), in order to give full play to the effect of bi-directional DC-DC, its both ends be generally connected to battery and
Electric capacity, when load increases power, now battery and electric capacity are in discharge condition, meet when load is high-power to the need of electric current
Will, when load gradually reduces power or is stopped suddenly, now load can send electric current, be charged to battery and electric capacity.
Suitable electric capacity and its running parameter are how selected, the requirement of load discharge, while and can maximum limit should be met
Degree reduces cost, critically important for a charge-discharge system.《Super capacitor and dynamic lithium battery hybrid electric automobile
Engineering research》One text, although giving a kind of computational methods of battery and electric capacity, what it considered is charge-discharge system with
Relation between the milimeter number of electric automobile during traveling, not using bidirectional DC-DC converter, consider electric capacity work without emphasis
Best operating point problem.
Determine that its operating voltage needed of load system is cell number that is certain, being concatenated in charge-discharge system based on one
In the case that amount is certain, the characteristic of capacitor transient stage current-variable is made full use of, electric capacity filling in systems can be given full play to
Discharge process.
Therefore the capacity and operating voltage of electric capacity in charge-discharge system how are rapidly and accurately determined, to ensure discharge and recharge system
Battery can meet the needs of load system in discharge and recharge in system, while and can ensures the safety of battery, extend the longevity of battery
Life, has important science and application value.
The content of the invention
For the deficiencies in the prior art, it is an object of the invention to provide a kind of bidirectional DC/DC-electricity of discharge and recharge
The determination method of capacitor's capacity in electric mixed dynamic system.
Technical scheme is as follows：
A kind of bidirectional DC/DC of discharge and recharge-electric electric mixed dynamic system, the hybrid power system include load system,
Battery modules and capacitance group, the battery modules and capacitance group are arranged in parallel with load system and powered jointly to load system,
It is characterized in that：Also include a bidirectional DC/DC converter, the capacitance group is connected by the bidirectional DC/DC converter and battery modules
Connect, the positive terminal of the load system is provided with a current limiting system, and the battery modules and bidirectional DC/DC converter pass through the limit
Streaming system is connected with load system.
Optionally, the current limiting system includes current sensing means, current-limiting apparatus and control unit, and wherein current detecting fills
Put for detecting sense of current and feeding back to control unit, control unit drives charging current of the current-limiting apparatus to battery modules
Limited with discharge current.
Optionally, the load system includes motor load and inverter, and inverter is when load increases power by battery
Module and the electric current of capacitance group are changed into the alternating current that load needs, and when bearing power reduces, self-supported in the future is unnecessary
Electric current is changed into DC current battery modules and capacitance group.
A kind of determination method of the capacitance group minimum capacitance of foregoing bidirectional DC/DC-electric electric mixed dynamic system, its
It is characterised by comprising the following steps：
Assuming that voltage is maintained at Uz during condenser paper, the capacitance of electric capacity is C, and the voltage of electric capacity is increased to electricity by Uz during charging
The maximum Uc that appearance group allows, the energy Q1 of capacitance group charging are：
The voltage of electric capacity is reduced to the common minimum threshold 3V of battery by Uz during electric discharge, and the energy Q2 of electric capacity output is：
When holding voltage when condenser paper is Uz, electric capacity takes the capacitance of minimum, electric energy that electric capacity can release and can be with
The electric energy being filled with is equal, now it is considered that battery participates in the energy very little being charged and discharged, can ignore, by (1) (2) two formula
It is equal, it can obtain
The ceiling voltage Uc to be charged on usual electric capacity is much larger than 3V, can now ignore energy of the electric capacity in 3V i.e.
Holding magnitude of voltage when the ceiling voltage of capacitance group work is obtained with working during condenser paper.Due in the parameter
Lower work, the energy flow of load are occurred mainly between electric capacity and load, and battery, which participates in energy exchange, to be ignored.Therefore can
To calculate the minimum capacity capacity that needs in this case, peak value during loaded work piece is Imax, is held time as t, its work
Voltage is exactly the voltage Vb in battery modules
Can be in the hope of the minimum capacity C of capacitance group by (3) (4) two formula
C=(4 × Imax × Vb × t)/Uc2
The technical effects of the invention are that：
In bidirectional DC/DC-electric electric mixed dynamic system of the present invention, by setting bidirectional DC/DC converter, system is improved
The dynamic response of discharge and recharge, while be easy to that charging/discharging voltage and current parameters is adjusted flexibly.
In bidirectional DC/DC-electric electric mixed dynamic system of the present invention, by setting current limiting system, battery modules can be existed
Electric current under discharge condition and charged state is limited respectively, particularly stringent to limit its charging current, can preferably be protected
Battery modules and its service life of extension.
The present invention also provides a kind of minimum capacitance of the capacitance group on the bidirectional DC/DC-electric electric mixed dynamic system really
Determine method, by only considering the capacitor charge and discharge under series-connected cell module certain condition, simplify computational methods, there is pole
Strong feasibility.
Brief description of the drawings
Fig. 1 show the circuit theory diagrams of bidirectional DC/DC-electric electric mixed dynamic system of the present invention.
Fig. 2 show the circuit theory diagrams of the current limiting system of the present invention.
Fig. 3 show the fundamental diagram of the present invention in the charge state.
Fig. 4 show the fundamental diagram of the present invention in the discharged condition.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
It is as shown in Figure 1 the circuit theory diagrams of bidirectional DC/DC-electric electric mixed dynamic system of the invention.It is including load
System, current limiting system, battery modules, bi-directional DC-DC and capacitance group, wherein battery modules, bi-directional DC-DC and capacitance group, which are formed, fills
Discharge system, load system include motor load and inverter, and inverter has two effects, on the one hand increase work(suddenly in load
When rate needs electric current, the DC current of charge-discharge system is transformed into the alternating current of load needs.
When load gradually reduces power or closes power suddenly, inverter can be passed through again by now loading unnecessary electric current
Direct current is transformed into by exchange and feeds back to charge-discharge system, is charged to battery and electric capacity.
The operation principle of current limiting system is as shown in Fig. 2 mainly by current sensing means, current-limiting apparatus and control unit structure
Into wherein current sensing means can detect charge-discharge system sense of current, and feed back to control unit so as to drive current limliting
Device is controlled, and current-limiting apparatus can be limited the charging current and discharge current of battery modules.Its effect includes
Two aspects：On the one hand when increase power needs electric current suddenly for load, now electric current mainly passes through bi-directional DC-DC by capacitance group
Conversion flow to load system, current sensing means feeds back to control unit, control unit driving limit according to this current direction
The maximum current that stream device externally discharges battery modules is limited to set-point；On the other hand when load gradually reduces power or prominent
When so closing power, current sensing means feeds back to control unit according to current direction, and control unit drives current-limiting apparatus to electricity
Pond module carries out safe charging with the current value set, protects battery.
Current limiting system is charged and discharged electric current to battery and sets threshold limit respectively according to current direction.
Current limiting system is not limited bi-directional DC-DC.
Battery modules are mainly in series by one group of operating voltage, inner resistance identical battery.Battery modules can give
Load one stable operating voltage of offer, when increase power needs electric current suddenly for load, to ensure battery modules offer
Load voltage is stable, the external output current very little of battery modules, can be approximately considered the electric current of load needs essentially from electric capacity
Group；When load gradually reduces power or closes power suddenly, the electric current from inverter conversion can be absorbed, i.e., in charging
State.
The effect of bi-directional DC-DC is also divided to two aspects, now double on the one hand when increase power needs electric current suddenly for load
Pressure-increasning state is operated in DC-DC, load system is provided current to by capacitance group；On the other hand when load reduction power or suddenly
When closing power, bi-directional DC-DC is operated in decompression state, by the unnecessary electric current of load system by conversion, with suitable parameter
Capacitance group is charged.
Capacitance group is to be made up of one group of parameter identical electric capacity by series, parallel.When load increase power needs electric current
When, in discharge condition；When load reduction power or closing power suddenly, energy regenerating is carried out, in charged state.
Two states are charged and discharged to electric capacity individually below and carry out analysis calculating, it is optimal to find out by analyzing calculating
Capacitance size and electric capacity operating voltage.
As shown in figure 3, it is the fundamental diagram under charged state of the present invention.If usually voltage is maintained at Uz to capacitance group, electricity
The capacitance of appearance group is C, and the voltage of capacitance group is increased to the maximum Uc of capacitance group permission by Uz during charging, and the value can be by looking into
The pressure voltage for asking single electric capacity is readily available.In the process, due to current limiting system be present, when load reduction power or suddenly
When closing power, current sensing means is able to detect that the electric current of load outflow is I in current limiting system, when I is more than some threshold value,
Such as battery electric quantity 1C when, bi-directional DC-DC start working, load unnecessary electric energy give capacitance group charging, current sensing means
Sense of current and size are detected, feeds back to control unit, control unit drives current-limiting apparatus electric to the maximum for flowing into battery
Stream is limited, and prevents battery modules from being damaged due to large current charge, so as to play protection battery, extends the work of battery life
With.Now capacitance group charging energy Q1 be：
The energy of electric discharge can be similarly analyzed, as shown in figure 4, being the fundamental diagram under discharge condition of the invention.
Usually voltage is maintained at Uz to capacitance group, and the capacitance of capacitance group is C, and it is normal by Uz to be reduced to battery modules for the voltage of capacitance group during electric discharge
The minimum threshold 3V seen.In the process, due to current limiting system be present, when load increases power, electric current is examined in current limiting system
Survey device and be able to detect that it is I to flow into load current, when I is more than some threshold value, such as during the 1C of battery electric quantity, bi-directional DC-DC
Start working, the electric current for loading needs is mainly provided by capacitance group, in discharge process, although externally electric discharge needs also exist for battery
Current-limiting apparatus is limited, and current sensing means detects sense of current and size, feed back to control unit, control unit
Driving current-limiting apparatus is limited the maximum current for flowing out battery, prevents battery from causing the electricity of battery because discharge current is excessive
Press through it is low, so as to playing steady load operating voltage.Now electric capacity output energy Q2 be：
Suitable capacitance voltage running parameter is selected, when the holding voltage of capacitance group usually is Uz, capacitance group takes minimum
Capacitance, the electric energy that capacitance group can release is equal with the electric energy that can be filled with, now it is considered that battery modules participate in charging
It with the energy very little of electric discharge, can ignore, function only as the effect of burning voltage, may also reach up the life-span for extending battery modules
Purpose.
It is equal by (1) (2) two formula, it can obtain
The ceiling voltage Uc to be charged in usual capacitance group is much larger than 3V, can now ignore energy of the capacitance group in 3V i.e.
I.e.：Learn that the ceiling voltage of capacitance group work is obtained with holding magnitude of voltage when capacitance group usually works.By
Worked under the parameter, the energy flow of load is occurred mainly between electric capacity and load, and battery participates in energy exchange can be with
Ignore.Therefore the minimum capacity capacity needed in this case can be calculated, peak value during loaded work piece is Imax, is held time
For t, its operating voltage is exactly the voltage Vb in battery modules
Can be in the hope of the minimum capacity C of capacitance group by (3) (4) two formula
C=(4 × Imax × Vb × t)/Uc2
(5)
For battery modules, generally battery modules by some identical parameters battery series connection, parallel combination
Form, according to loaded work piece voltage, it is easy to calculate the number of batteries of series, parallel.If similarly general capacitance group be also all by
The electric capacity series, parallel combination of dry identical parameters is formed, therefore is easy to calculate the single electricity of needs by (3) and (5) formula
Holding voltage when the amount of capacity of appearance and work.
The present invention carrys out the voltage of steady load work, prevented simultaneously by adding current limiting system in hybrid power system
Battery the problem of service life shortens caused by overcharging, and due to taking full advantage of capacitance group in discharge and recharge system
Effect in system, simplify the design of charge-discharge system, by calculate be readily available electric capacity work optimum operating voltage and
Minimum capacity capacity, while load system work is met, reduce the design cost of capacitance group.
Claims (4)
1. a kind of bidirectional DC/DC of discharge and recharge-electric electric mixed dynamic system, the hybrid power system include load system, electricity
Pond module and capacitance group, the battery modules and capacitance group are arranged in parallel with load system and powered jointly to load system, its
It is characterised by：Also including a bidirectional DC/DC converter, the capacitance group is connected by the bidirectional DC/DC converter with battery modules,
The positive terminal of the load system is provided with a current limiting system, the battery modules and bidirectional DC/DC converter and passes through the current limliting system
System is connected with load system.
2. bidirectional DC/DC as claimed in claim 1-electric electric mixed dynamic system, it is characterised in that：The current limiting system includes
Current sensing means, current-limiting apparatus and control unit, wherein current sensing means are used to detect sense of current and feed back to control
Unit processed, control unit driving current-limiting apparatus are limited the charging current and discharge current of battery modules.
3. bidirectional DC/DC as claimed in claim 2-electric electric mixed dynamic system, it is characterised in that：The load system includes
The electric current of battery modules and capacitance group is changed into load needs by motor load and inverter, inverter when load increases power
Alternating current, when bearing power reduces, self-supported unwanted currents are changed into DC current feedback refunds battery mould in the future
Group and capacitance group.
A kind of 4. determination side of the capacitance group minimum capacitance of bidirectional DC/DC-electric electric mixed dynamic system as claimed in claim 1
Method, it is characterised in that comprise the following steps：
Assuming that voltage is maintained at Uz during condenser paper, the capacitance of electric capacity is C, and the voltage of electric capacity is increased to capacitance group by Uz and permitted during charging
Perhaps maximum Uc, the energy Q1 of capacitance group charging are：
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The voltage of electric capacity is reduced to the common minimum threshold 3V of battery by Uz during electric discharge, and the energy Q2 of electric capacity output is：
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Electric energy it is equal, now it is considered that battery participate in be charged and discharged energy very little, can ignore, by (1) (2) two formula phase
Deng can obtain
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Make, the energy flow of load is occurred mainly between electric capacity and load, and battery, which participates in energy exchange, to be ignored.Therefore can count
Calculate the minimum capacity capacity that needs in this case, peak value during loaded work piece is Imax, is held time as t, its operating voltage
It is exactly the voltage Vb in battery modules
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Can be in the hope of the minimum capacity C of capacitance group by (3) (4) two formula
C=(4 × Imax × Vb × t)/Uc2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710582532.4A CN107351710A (en) | 2017-07-17 | 2017-07-17 | The determination method of capacitance group minimum capacitance in a kind of bidirectional DC/DC electricity electric mixed dynamic system of discharge and recharge and the system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710582532.4A CN107351710A (en) | 2017-07-17 | 2017-07-17 | The determination method of capacitance group minimum capacitance in a kind of bidirectional DC/DC electricity electric mixed dynamic system of discharge and recharge and the system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107351710A true CN107351710A (en) | 2017-11-17 |
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| CN114759622A (en) * | 2020-12-25 | 2022-07-15 | 比亚迪股份有限公司 | Battery system, vehicle and control method thereof |
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Application publication date: 20171117 |