CN206164198U - Lithium cell power conversion unit - Google Patents
Lithium cell power conversion unit Download PDFInfo
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- CN206164198U CN206164198U CN201621120390.7U CN201621120390U CN206164198U CN 206164198 U CN206164198 U CN 206164198U CN 201621120390 U CN201621120390 U CN 201621120390U CN 206164198 U CN206164198 U CN 206164198U
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model provides a lithium cell power conversion unit includes lithium cell group, power converter, the inductive current that charges ring, the inductive current that discharges ring, battery voltage ring sum direct current busbar voltage ring. Lithium cell power conversion unit work in charge mode lower time, the battery voltage ring connects with the inductive current linkage that charges to the inductive current that charges ring output control signal to power converter is so that lithium cell group is charged. Lithium cell power conversion unit work in voltage source mode lower time, direct current busbar voltage ring connects with the inductive current linkage that discharges to the inductive current that discharges ring output control signal to power converter is so that lithium cell group discharges. Lithium cell power conversion unit work in electric current source mode lower time, constant current source value is encircled to the inductive current that discharges by the input to the inductive current that discharges ring output control signal to power converter is so that lithium cell group discharges.
Description
Technical field
The utility model is related to super UPS fields, more particularly to a kind of lithium battery power conversion for super ups system
Unit.
Background technology
With the continuous lifting of the requirement of the occasion electricity consumption reliabilities such as communication, internet and industry, to uninterrupted power source
Reliability, the requirement of security also improves therewith.In order to further lift the power supply reliability of uninterrupted power source, it is super not between
The concept in power-off source (Super UPS or super UPS) is produced therewith.In super uninterrupted power source in addition to civil power (Grid),
Also add fuel cell (FC), gas turbine (GT), lithium battery (LB), super capacitor (SC) and photovoltaic (PV) etc. independent mutually
The energy to increase the redundancy of the standby electricity of system, improve the reliability of power supply.
Super ups system operation in, lithium battery power conversion unit in addition to as standby energy-storage units, also in different energy
Play maintenance in the gap of source switching dc bus be constant, proof load is powered continual effect.Meanwhile, lithium battery power becomes
Change unit will also be managed to the charge and discharge of battery.Because lithium battery is all more sensitive to voltage and current, overcharge or cross and put
Expendable damage will be caused to battery.Therefore lithium battery power conversion unit needs accurate charge and discharge control strategy.
Utility model content
The purpose of this utility model is to provide a kind of lithium battery power conversion unit in super ups system, the lithium
Power of battery converter unit is worked by being occurred in super ups system using rational schema management scheme under different events
In different patterns to realize different functions, so as to realize the electrical grid failure in super ups system, other energy units
When conversion power supply can compounding practice to maintain, the DC bus-bar voltage of super ups system is constant, proof load side confession
Electricity is stable.Also, the lithium battery power conversion unit can also realize that the rational charge and discharge to lithium battery are managed, so as to
Enough avoid overcharging lithium battery or being crossed putting and caused expendable damage, extend the service life of lithium battery.
In order to achieve this, the utility model provides a kind of lithium battery power conversion unit, for super ups system, bag
Include：Lithium battery group, including the first lithium battery and the second lithium battery that are connected in series；And power inverter, including the first power
Converter and the second power inverter, the first power inverter include the first input capacitance, the first inductor, the first transistor,
Transistor seconds, the first output capacitance, the first input capacitance is in parallel with the first lithium battery, one end connection first of the first inductor
The positive pole of lithium battery, the other end connection the first transistor colelctor electrode and transistor seconds emitter stage, the first transistor send out
Emitter-base bandgap grading connects the negative pole of the first lithium battery, and one end of the first output capacitance connects the colelctor electrode of transistor seconds, other end connection
The emitter stage of the first transistor, the second power inverter include the second input capacitance, the second inductor, third transistor, the 4th
Transistor, the second output capacitance, the second input capacitance is in parallel with the second lithium battery, and one end of the second inductor connects the second lithium electricity
The negative pole in pond, the emitter stage of other end connection third transistor and the colelctor electrode of the 4th transistor, the colelctor electrode of third transistor
Connect the positive pole of the second lithium battery, one end of the second output capacitance connects the emitter stage of the 4th transistor, other end connection the 3rd
The colelctor electrode of transistor, in the super ups system, the second dc bus end of emitter stage connection of the first transistor, second
The colelctor electrode of transistor connects the first dc bus end, and the colelctor electrode of third transistor connects the second dc bus end, and the 4th is brilliant
The emitter stage of body pipe connects the 3rd dc bus end, and the gate pole of the first transistor is input into the first control signal, the second crystal
The gate pole of pipe is input into the second control signal, and the gate pole of third transistor is input into the 3rd control signal, and the gate pole of the 4th transistor is defeated
Enter the 4th control signal.
Further, according to lithium battery power conversion unit as above, further include：Charging inductance electric current loop, bag
Inductive current input is included, the electric current of the first inductor or the second inductor is flow through in input, and charging current reference value input is defeated
Enter charging current reference value, and control signal output, export first control signal, second control signal, described
3rd control signal and the 4th control signal, and cell voltage ring, including cell voltage input, input first
The cell voltage of lithium battery or the second lithium battery, cell voltage reference value input is input into cell voltage reference value, and the electricity that charges
Stream output end, exports charging current, works under charge mode in the super ups system in lithium battery power conversion unit
When, the charging current output end is connected with the charging current reference value input, and in first control signal, institute
Under stating the second control signal, the 3rd control signal, the control of the 4th control signal, the lithium battery group is electrically charged.
Further, according to lithium battery power conversion unit as above, further include：Electric discharge inductive current ring, bag
Include
The electric current of the first inductor or the second inductor is flow through in inductive current input, input, and discharge current reference value is defeated
Enter end, be input into discharge current reference value, and control signal output, export first control signal, the second control letter
Number, the 3rd control signal and the 4th control signal, and DC bus-bar voltage ring, including busbar voltage input
End, the voltage being input between the first dc bus end and the second dc bus end or the second dc bus end and the 3rd dc bus
Voltage between end, busbar voltage reference value input, inlet highway voltage reference value, and discharge current output end, output is put
Electric current, when lithium battery power conversion unit is worked under voltage source mode in the super ups system, the electric discharge electricity
Stream output end is connected with the discharge current reference value input, and in first control signal, the second control letter
Number, the 3rd control signal, under the control of the 4th control signal, the lithium battery group electric discharge.
Further, according to lithium battery power conversion unit as above, in lithium battery power conversion unit described super
When working under current source mode in level ups system, the discharge current reference value input input constant current value, and
Under first control signal, second control signal, the 3rd control signal, the control of the 4th control signal,
The lithium battery group electric discharge.
Further, according to lithium battery power conversion unit as above, further include：Host computer；And model selection
Portion, wherein, mode selection part receive host computer output charge mode instruction after so that the charging current output end with
The charging current reference value input connection.
Further, according to lithium battery power conversion unit as above, further include：Host computer；And model selection
Portion, wherein, mode selection part is after the voltage source mode instruction for receiving host computer output so that the discharge current output end
It is connected with the discharge current reference value input.
Further, according to lithium battery power conversion unit as above, further include：Host computer, wherein, host computer
The constant current value is exported to the discharge current reference value input.
Further, according to lithium battery power conversion unit as above, the process that the lithium battery group is electrically charged includes：
Constant-current charging phase, in the stage, cell voltage ring filling, the charging current output end output violent change current value is used as described
Charging current, until the cell voltage of the first lithium battery or the second lithium battery moves back saturation from less than the arrival of cell voltage reference value
Till voltage；Constant voltage charging phase, in the stage, cell voltage ring exits saturation state, and the lithium battery group is with constant voltage mode
It is electrically charged, charging current output end is exported by the calculated current value of cell voltage ring as the charging current, until institute
Charging current is stated less than charge cutoff electric current；And the charging termination stage, in the stage, it is described that charging current output end is exported
Charging current is 0, and the cell voltage of the first lithium battery and the second lithium battery is fallen after rise respectively to standing voltage.
Further, according to lithium battery power conversion unit as above, the process of the lithium battery group electric discharge includes：It is permanent
Stream discharge regime, in the stage, the constant current value of the discharge current reference value input input is not zero, the lithium battery
Group constant-current discharge is until the cell voltage of the first lithium battery and the second lithium battery is less than discharge cut-off voltage, and electric discharge terminates rank
Section, in the stage, the constant current value of the discharge current reference value input input is zero, and the first lithium battery and the second lithium are electric
The cell voltage in pond gos up to standing voltage.
Further, according to lithium battery power conversion unit as above, the first transistor, second crystal
Pipe, the third transistor, the 4th transistor are respectively insulated gate bipolar transistor, and first control signal
With the 3rd control signal homophase, second control signal and the 4th control signal homophase, the first control letter
Number anti-phase with second control signal, the 3rd control signal is anti-phase with the 4th control signal.
Lithium battery power conversion unit in super ups system provided by the utility model is by using rational
Schema management scheme, occurs working in different patterns to realize different functions under different events in super ups system, from
And the electrical grid failure in super ups system can be realized, being capable of compounding practice when other energy unit conversion power supplies
To maintain the DC bus-bar voltage of super ups system constant, it is ensured that the power supply of load-side is stablized.Also, the utility model is carried
For lithium battery power conversion unit can also realize managing the rational charge and discharge of lithium battery such that it is able to avoid to lithium
Battery is overcharged or crossed and put and caused expendable damage, extends the service life of lithium battery.
Description of the drawings
Fig. 1 is the schema management state diagram of the lithium battery power conversion unit according to the utility model embodiment；
Fig. 2 is the control of the lithium battery power conversion unit for super ups system according to the utility model embodiment
Block diagram；
Fig. 3 (a) shows lithium battery power conversion unit when working in super ups system under charge mode, therein
Current direction schematic diagram, Fig. 3 (b) shows that lithium battery power conversion unit is worked under voltage source mode in super ups system
When, current direction schematic diagram therein, Fig. 3 (c) shows that lithium battery power conversion unit works in electric current in super ups system
When under source module, current direction schematic diagram therein；
Fig. 4 is the schematic diagram of the Charge Management process of the lithium battery power conversion unit of the utility model embodiment；
Fig. 5 works in the electric discharge management under current source mode for the lithium battery power conversion unit of the utility model embodiment
The schematic diagram of process；And
Fig. 6 switches to the ripple of charge mode for the lithium battery power conversion unit of the utility model embodiment from standby mode
Shape schematic diagram；
Fig. 7 (a) is that the lithium battery power conversion unit for being related to the utility model embodiment switches to voltage from charge mode
The waveform diagram of source module；
Fig. 7 (b) is that the lithium battery power conversion unit for being related to the utility model embodiment switches to voltage from standby mode
The waveform diagram of source module；
Fig. 8 (a) is the lithium battery power conversion unit for being related to the utility model embodiment in other energy units control mother
During line, from charge mode the waveform diagram of current source mode is switched to；And
Fig. 8 (b) is that the lithium battery power conversion unit for being related to the utility model embodiment is switched to from current source mode and filled
The waveform diagram of power mode.
Specific embodiment
It is right by the explanation of specific embodiment below in conjunction with accompanying drawing further to illustrate content of the present utility model
The utility model carries out more deeply specifically introducing.
Rational schema management scheme can be adopted according to lithium battery power conversion unit of the present utility model, with super
Ups system occurs working in different patterns to realize different functions under different events.Fig. 1 is according to the utility model reality
Apply the schema management state diagram of the lithium battery power conversion unit of example.Correspondingly, table 1 is corresponding to the patten transformation in Fig. 1
Event table.
Table 1
| Sequence number | Event content |
| Event 1 | Electric network power-fail or net-side rectifier failure |
| Event 2 | Electrical network is normal and battery underfill is electric |
| Event 3 | Combustion gas or fuel-cell generation unit energy are less than load energy |
| Event 4 | Photovoltaic generation is superfluous more than energy needed for load or generated output |
Referring to Fig. 1 and Biao 1, in the utility model, the strategy of lithium battery power conversion unit schema management is as follows：In electrical network
During normal and lithium battery underfill electricity (correspondence event 2), the work of lithium battery power conversion unit is charge mode with to lithium battery
It is charged；In systems during electric network fault (electric network power-fail or grid side rectifier fault) (correspondence event 1), outside two kinds of energy
The gap that source switches over, such as electrical network are switched to fuel cell, electrical network and are switched to fuel gas generation, generally require and arrive within several seconds tens of
Second, at this moment need the work of lithium battery power conversion unit promptly to discharge for voltage source mode and support dc bus, until two kinds
The energy completes switching.When photovoltaic generation energy is more than loading demand or generated output superfluous (correspondence event 4), and lithium battery
During underfill electricity, lithium battery power conversion unit works in charge mode to be charged lithium battery the standby electricity to realize most long
Time；When combustion gas, fuel cell power generation power are less than load power demand (correspondence event 3), lithium battery power conversion unit
Work as current source mode so that lithium battery discharges, supplement the power notch of output to maintain load supplying to stablize.Additionally,
Lithium battery power conversion unit is needed not be to realize during corresponding function under above-mentioned Three models, is receiving standby command
In the case of, lithium battery power conversion unit will be in holding state.
Fig. 2 shows the control of the lithium battery power conversion unit for super ups system according to the utility model embodiment
Block diagram processed.
As shown in Fig. 2 the lithium battery power conversion unit that embodiment is provided includes lithium battery group 21 and power inverter
22。
Lithium battery group 21 is obtained by two consistent lithium battery series connection of specifications parameter, with equivalent electromotive force v in Fig. 21, battery
Internal resistance r1To represent one of lithium battery, with equivalent electromotive force v2, internal resistance of cell r1To represent another lithium battery.Below
Claim and (v respectively1, r1) corresponding lithium battery be the first lithium battery, and with (v2, r1) corresponding lithium battery be the second lithium battery.
Power inverter 22 is obtained using the consistent Buck/Boost topology parallel connections of two independent controls and main circuit parameter
Two-way DC/DC converters, below each single Buck/Boost is referred to as into the first power inverter and the second power and is become
Parallel operation, wherein the first power inverter is corresponding with the first lithium battery, the second power inverter is corresponding with the second lithium battery.
As shown in Fig. 2 the first power inverter includes the first input capacitance Ca1, the first inductor Lb1, the first transistor
221st, transistor seconds 222, the first output capacitance Cb1.Second power inverter includes the second input capacitance Ca2, the second inductor
Lb2, third transistor 223, the 4th transistor 224, the second output capacitance Cb2.Wherein, Ca1=Ca2=Ca, Cb1=Cb2=Cb, Lb1
=Lb2=Lb.In embodiment, the first transistor 221, transistor seconds 222, third transistor 223, the 4th transistor 224 are distinguished
Using insulated gate bipolar transistor (IGBT).
First input capacitance Ca1It is in parallel with the first lithium battery, the first inductor Lb1One end connect the first lithium battery just
Pole, the colelctor electrode of other end connection the first transistor 221 and the emitter stage of transistor seconds 222, the transmitting of the first transistor 221
Pole connects the negative pole of the first lithium battery, the first output capacitance Cb1One end connect transistor seconds 222 colelctor electrode, the other end connect
Connect the emitter stage of the first transistor 221.
Second input capacitance Ca2It is in parallel with the second lithium battery, the second inductor Lb2One end connect the negative of the second lithium battery
Pole, the emitter stage of other end connection third transistor 223 and the colelctor electrode of the 4th transistor 224, the current collection of third transistor 223
Pole connects the positive pole of the second lithium battery, the second output capacitance Cb2One end connect the 4th transistor 224 emitter stage, the other end connect
Connect the colelctor electrode of third transistor 223.
In super ups system, the emitter stage of the first transistor 221 and the second dc bus end (O ends) of dc bus
Connection, the colelctor electrode of transistor seconds 222 is connected with the first dc bus end (P ends) of dc bus, third transistor 223
Colelctor electrode is connected with the second dc bus end (O ends) of dc bus, and the of the emitter stage of the 4th transistor 224 and dc bus
Three dc bus ends (N-terminal) connect.The gate pole of the first transistor 221 is input into the first control signal g1, the door of transistor seconds 222
Pole is input into the second control signal g2, gate pole the 3rd control signal g of input of third transistor 2233, the gate pole of the 4th transistor 224
It is input into the 4th control signal g4.In embodiment, the first control signal g1With the 3rd control signal g3Homophase, the second control signal g2
With the 4th control signal g4Homophase, the first control signal g1With the second control signal g2Complementary (anti-phase), the 3rd control signal g3With
4th control signal g4Complementary (anti-phase).
As shown in Fig. 2 in embodiment, lithium battery power conversion unit further includes charging inductance electric current loop 23 and electric discharge
Inductive current ring 24.Wherein, charging inductance electric current loop 23 is used for when lithium battery power conversion unit is worked under charge mode
Export the first control signal g1, the second control signal g2, the 3rd control signal g3And the 4th control signal g4；Electric discharge inductance electricity
Stream ring 24 is used for the control of output first letter when under lithium battery power conversion unit works in voltage source mode or current source mode
Number g1, the second control signal g2, the 3rd control signal g3And the 4th control signal g4.In embodiment, charging inductance electric current loop
23 is different from the control loop for differring primarily in that charging, discharging of electric discharge inductive current ring 24, but basic hardware structure phase
Together, a set of hardware configuration therefore is only shown in fig. 2 to represent charging inductance electric current loop 23 and electric discharge inductive current ring 24.
Charging inductance electric current loop 23 includes inductive current input 231, charging current reference value input 232 and control
Signal output part processed 233.The first inductor L is flow through in the input of inductive current input 231b1Or the second inductor Lb2Electric current
iL1Or iL2.Here, the electric current i of the input of inductive current input 231L1Or iL2It is the stream that obtains of sampling of charging inductance electric current loop 23
Cross the first inductor Lb1Or the second inductor Lb2Electric current actual feedback.Charging current reference value input 232 is input into
Charging current reference value iLref1.Electric current iL1Or iL2With charging current reference value iLref1Carry out the signal after calculus of differences to be admitted to
PI (proportional integral) circuit corresponding with charge control, the signal after PI circuit computings is again through corresponding PWM (pulse width
Degree modulation) corresponding control signal (the first control signal g is obtained after the related operation such as circuit1, the second control signal g2, the 3rd control
Signal g processed3And the 4th control signal g4), export from control signal output 233.In embodiment, through pwm circuit computing
The plates of overdriving of Jing after the pwm signal of 0～5V are obtained afterwards is converted to the control signal of -9V～15V.First control signal g1With the 3rd
Control signal g3It is identical, the second control signal g2With the 4th control signal g4It is identical, and the first control signal g1With the second control
Signal g2Anti-phase (complementation).
Electric discharge inductive current ring 24 includes inductive current input 241, discharge current reference value input 242 and control
Signal output part processed 243.The first inductor L is flow through in the input of inductive current input 241b1Or the second inductor Lb2Electric current
iL1Or iL2.Equally, the electric current i of the input of inductive current input 241L1Or iL2It is the stream that the sampling of inductive current ring 24 obtains that discharges
Cross the first inductor Lb1Or the second inductor Lb2Electric current actual feedback.Discharge current reference value input 242 is input into
Discharge current reference value iLref2.Electric current iL1Or iL2With discharge current reference value iLref2Carry out the signal after calculus of differences to be admitted to
PI (proportional integral) circuit corresponding with control of discharge, the signal after PI circuit computings is again through corresponding PWM (pulse width
Degree modulation) corresponding control signal (the first control signal g is obtained after the related operation such as circuit1, the second control signal g2, the 3rd control
Signal g processed3And the 4th control signal g4), export from control signal output 243.Equally, in embodiment, through pwm circuit
The plates of overdriving of Jing after the pwm signal of 0～5V are obtained after computing and is converted to the control signal of -9V～15V.First control signal g1With
3rd control signal g3It is identical, the second control signal g2With the 4th control signal g4It is identical, and control signal g1With the second control
Signal g processed2Anti-phase (complementation).
In embodiment, the first inductor L is flow throughb1Electric current iL1With flow through the second inductor Lb2Electric current iL2Equal (iL1
=iL21=iL), and as the first inductor Lb1Middle electric current iL1Flow direction as shown by arrows in FIG. from left to right (correspondence is second electric
Sensor Lb2Middle electric current iL2Flow direction as shown by arrows in FIG. from right to left) when, electric current iL1(electric current iL2) value for just, on the contrary then
Electric current iL1(electric current iL2) value be negative.In embodiment, by charging inductance electric current loop 23, in corresponding first control signal g1、
Second control signal g2, the 3rd control signal g3And the 4th control signal g4Control under, can cause to flow through the first inductance
Device Lb1Electric current iL1With flow through the second inductor Lb2Electric current iL2It is controlled to and charging current reference value iLref1It is equal；By putting
Electric inductive current ring 24, in corresponding first control signal g1, the second control signal g2, the 3rd control signal g3And the 4th control
Signal g processed4Control under, can cause to flow through the first inductor Lb1Electric current iL1With flow through the second inductor Lb2Electric current iL2
It is controlled to and discharge current reference value iLref2It is equal.Therefore, charging current reference value iLref1With discharge current reference value iLref2's
Sign determines to flow through the first inductor Lb1Electric current iL1With flow through the second inductor Lb2Electric current iL2Sign, that is, certainly
The discharge and recharge of lithium battery group 21 is determined.
In embodiment, lithium battery power conversion unit further includes cell voltage ring 25, and cell voltage ring 25 includes electricity
Cell voltage input 251, cell voltage reference value input 252, charging current output end 253.Cell voltage input 251 is defeated
Enter the cell voltage v of the first lithium batterybat1Or second lithium battery cell voltage vbat2.Here, cell voltage input 251 is defeated
The cell voltage v for enteringbat1Or vbat2It is the cell voltage or the second lithium battery of the first lithium battery that the sampling of cell voltage ring 25 is obtained
Cell voltage actual feedback.Cell voltage reference value input 252 is input into cell voltage reference value vbat_ref.Battery electricity
Pressure vbat1Or vbat2With cell voltage reference value vbat_refCarry out the signal after calculus of differences and be admitted to PI (proportional integral) circuit to enter
Row computing obtains charging current iL.char(symbol is negative), exports from charging current output end 253.In embodiment, cell voltage
vbat1=vbat21=vbat.In lithium battery power conversion unit when working in super ups system under charge mode, charge electricity
Stream output end 253 is connected by control with charging current reference value input 232, now in corresponding first control signal g1,
Two control signals g2, the 3rd control signal g3And the 4th control signal g4Control under, in lithium battery power conversion unit will
The current direction as shown in the block arrow in Fig. 3 (a) is produced, now, electric current flows to lithium battery group 21, lithium battery from dc bus
Group 21 is electrically charged.
As shown in Fig. 2 in embodiment, lithium battery power conversion unit further includes host computer 27 and mode selection part
28.When lithium battery power conversion unit needs to work under charge mode, host computer 27 to the output of mode selection part 28 is charged
Mode instruction, mode selection part 28 is when receiving from the charge mode instruction of host computer 27 so that charging current output end
253 are connected with charging current reference value input 232.
In embodiment, lithium battery power conversion unit further includes DC bus-bar voltage ring 26.DC bus-bar voltage ring
26 include busbar voltage input 261, busbar voltage reference value input 262, discharge current output end 263.Busbar voltage is defeated
Enter the voltage v that end 261 is input between the first dc bus end and the second dc bus endbus1Or second dc bus end with the 3rd
Voltage v between dc bus endbus2.Here, the voltage v of the input of busbar voltage input 261bus1Or vbus2It is dc bus
Voltage or the second dc bus end between the first dc bus end that obtains of sampling of Voltage loop 26 and the second dc bus end with
The actual feedback of the voltage between the 3rd dc bus end.The inlet highway Voltage Reference of busbar voltage reference value input 262
Value vbus_ref.Voltage vbus1Or vbus2With busbar voltage reference value vbus_refCarry out the signal after calculus of differences and be admitted to PI (ratios
Integration) circuit carries out computing and obtains discharge current iL.bus(symbol is for just), exports from discharge current output end 263.In embodiment,
Voltage vbus1=vbus2=vbus.In lithium battery power conversion unit when working in super ups system under voltage source mode, put
Electric current output terminal 263 is connected by control with discharge current reference value input 242, now in corresponding first control signal
g1, the second control signal g2, the 3rd control signal g3And the 4th control signal g4Control under, lithium battery power conversion unit
The middle current direction that will be produced as shown in the block arrow in Fig. 3 (b), now, electric current flows to dc bus from lithium battery group 21, lithium
Battery pack 21 is discharged.
In embodiment, when lithium battery power conversion unit needs to work under voltage source mode, host computer 27 is to pattern
The output voltage source mode instruction of selector 28, mode selection part 28 is receiving the voltage source mode instruction from host computer 27
When so that discharge current output end 263 is connected with busbar voltage reference value input 262.
Further, in embodiment, current source mould is worked in the super ups system in lithium battery power conversion unit
When under formula, input constant current value i of discharge current reference value input 242L.disc(symbol is for just), now corresponding first
Control signal g1, the second control signal g2, the 3rd control signal g3And the 4th control signal g4Control under, lithium battery power
The current direction as shown in the block arrow in Fig. 3 (c) will be produced in converter unit, now, electric current is flowed to directly from lithium battery group 21
Stream bus, lithium battery group 21 is discharged.In embodiment, constant current value i is exported by host computer 27L.discTo discharge current reference value
Input 242.
Additionally, as described above, due to the particularity of lithium battery, need in lithium battery power conversion unit running
In rational charge and discharge management is carried out to lithium battery, to avoid overcharging lithium battery or being crossed putting and caused irrecoverable
Damage, extend lithium battery service life.Battery charging management and battery according to the utility model embodiment is below described
Electric discharge management.Table 2 is it is shown that the technical parameter of lithium battery.
Table 2
(1) battery charging management
It is under charge mode in lithium battery power conversion unit, lithium battery group 21 is electrically charged.Fig. 4 is the utility model reality
Apply the schematic diagram of the Charge Management process of the lithium battery power conversion unit of example.As shown in figure 4, in embodiment, being electrically charged process
It is divided into：Constant-current charge, constant-voltage charge, charging termination three phases.
[0,t1] stage, it is constant-current charging phase.Now cell voltage vbatFar below cell voltage reference value vbat_ref, electricity
The saturation of cell voltage ring 25, the output violent change current value i of charging current output end 253c_maxAs charging current iL.char, now charge
Current reference value iLref1It is set as ic_max.With the carrying out charged, the voltage at the first lithium battery and the second lithium battery two ends is gradually
Rise, when reaching saturation voltage v is moved backbat.dropWhen, constant-current charging phase terminates.
[t1,t2] stage, it is constant voltage charging phase.Now cell voltage vbatClose cell voltage reference value vbat_ref, electricity
Cell voltage ring 25 exits saturation state, and lithium battery group 21 is electrically charged with constant voltage mode, and charging current output end 253 is exported by battery
The calculated current value i of Voltage loop 25L.charAs charging current reference value iLref1.In t2Moment, as current value iL.charIt is little
In charge cutoff electric current ic.endWhen, constant voltage charging phase terminates.
t>t2In the stage, be the charging termination stage.The charging current of the output of charging current output end 253 is 0, the first lithium battery
With the cell voltage v of the second lithium batterybatFall after rise respectively to standing voltage vbat_OC.Now power inverter 22 quits work.
According to the battery technology parameter of table 2, cell voltage reference value vbat_refIt is set to vchar(450V), charge cutoff electricity
Stream ic.endIt is set to ichar.end(4.65A), amplitude limit current value ic_maxIn battery operation electric current 0.5C (23.25A).Due to filling
Electric blanking voltage vchar.proFor 455V, it is therefore desirable to which voltage control accuracy is within 5V, in case voltage reaches during battery constant-voltage charge
To charge cutoff voltage.Meanwhile, in order to prevent battery charging overfill or very few, need current control accuracy within 1A.
(2) battery discharge management
Below describing the lithium battery power conversion unit according to the utility model embodiment by taking current source electric discharge as an example
Electric discharge management.It is under current source mode in lithium battery power conversion unit, lithium battery group 21 is discharged.Fig. 5 is the utility model
The lithium battery power conversion unit of embodiment works in the schematic diagram of the electric discharge management process under current source mode, wherein discharge
Process includes：
[0,t1] stage, it is the constant-current discharge stage.Now, constant current value i that the output of host computer 27 is not zeroL.discMake
For discharge current reference value iLref2.During constant-current discharge, cell voltage vbatConstantly reduce, in t1Moment, when the first lithium battery
With the cell voltage v of the second lithium batterybatLess than discharge cut-off voltage vbat_discWhen, constant-current discharge terminates.
t>t1In the stage, be electric discharge ending phase.Now, the discharge current ginseng of the input of discharge current reference value input 242
Examine value iLref2It is zero, the cell voltage v of the first lithium battery and the second lithium batterybatGo up to standing voltage vbat_OC。
According to the battery technology parameter of table 2, discharge cut-off voltage vbat_discIt is set to vdisc.end(392V), constant current
Value iL.discIn battery operation electric current 0.5C (23.25A).Put to prevent the inadequate and caused battery of control accuracy from crossing, equally
Voltage control accuracy is needed to be less than 5V.
In embodiment, because the PI loops shown in Fig. 2 are indifference control system, so causing cell voltage, current control
The main cause of error is sampling error.By selecting appropriate current sample components and parts index parameter and appropriate voltage sample
Components and parts index parameter, can realize the voltage control accuracy of 5V, in battery in battery operation voltage range 392V～450V
The current control accuracy of 1A is realized in the range of running current 0.5C (23.25A), so as to meet control accuracy requirement.
Next, by description based on the schema management scheme of the lithium battery power conversion unit of the utility model embodiment
Experimental result, with verify the lithium battery power conversion unit that the utility model embodiment is provided schema management scheme it is feasible
Property.
(1) electrical network normal condition
When electrical network is normal, lithium battery underfill when, lithium battery power conversion unit needs to switch to charge mode and comes to lithium
The battery charging charging time most long to ensure lithium battery.Fig. 6 is the lithium battery power conversion unit of the utility model embodiment
The waveform diagram of charge mode is switched to from standby mode.In t1Before moment, electrical network provides load institute after commutation inversion
Power is needed, now a phase current peak-to-peak value I of electrical network side rectifiergrid=17.5A, DC bus-bar voltage vbus=750V.In t1
The switching moment at moment, grid side rectification a phase current electric current peak-to-peak values are changed into Igrid=32.1A, unnecessary power is used to provide
Battery 0.2C (iL=-9.3A) charge required energy.As seen from Figure 6, in the mode transition procedure of lithium battery power conversion unit,
Lithium battery power conversion unit inductive current iLWithout impact.
(2) grid fault conditions
In grid fault conditions, lithium battery power conversion unit needs promptly to switch to voltage source from standby or charge mode
Discharge mode.Fig. 7 (a) is that the lithium battery power conversion unit for being related to the utility model embodiment switches to voltage from charge mode
The waveform diagram of source module.As seen from the figure, in t1Before moment, electrical network is normal and offer load and lithium battery press 0.2C (iL=
9.3A) power (bearing power P needed for constant-current chargeload=4kW), the now peak-to-peak value I of net side a phase currentgrid=
32.9A；In t1Moment, the unexpected power down of electrical network, lithium battery power conversion unit promptly switchs to voltage source mode and supports straight from charging
Stream busbar voltage, the inductive current mean value of lithium battery power conversion unit is iL=10.1A to maintain dc bus stablize,
Inductive current overshoot Δ i=5.3A in handoff procedure.
Fig. 7 (b) is that the lithium battery power conversion unit for being related to the utility model embodiment switches to voltage from standby mode
The waveform diagram of source module.As figure shows, in t1Before moment, electrical network is normal and provides bearing power (Pload=10kW), electrical network
The peak-to-peak value I of side a phase currentsgrid=46.5A；In t1Moment, the unexpected power down of electrical network, lithium battery power conversion unit is promptly from treating
Machine pattern switchs to voltage source mode and supports DC bus-bar voltage, and now the inductive current mean value of lithium battery power conversion unit is
iL=26.1A, inductive current overshoot Δ i=6.1A in handoff procedure.
From in above-mentioned figure, lithium battery power conversion unit realizes well direct current under charging and holding state
The effect of bus first support, meets the requirement of design.
2.1.3 other energy unit control bus situations
In other energy unit control dc bus, when generated energy is more than more than energy or generated output needed for load
During load power demand, lithium battery power conversion unit works in charge mode come the standby electricity to lithium cell charging to realize most growing
Time；When generated energy is less than energy needed for load, lithium battery power conversion unit works in current source mode and is discharged,
To maintain load supplying to stablize.
Fig. 8 (a) is the lithium battery power conversion unit for being related to the utility model embodiment in other energy units control mother
During line, from charge mode the waveform diagram of current source mode is switched to.In t1Before moment, lithium battery carries out 0.2C (iL=-
9.3A) charge, in t1Moment, lithium battery power conversion unit switches to current-mode and exports the given i of host computerL=10A
(4kW) electric current, to make up power notch.
Fig. 8 (b) is the lithium battery power conversion unit for being related to the utility model embodiment in other energy units control mother
During line, from current source mode the waveform diagram of charge mode is switched to.In t1Before moment, lithium battery module power conversion unit
It is operated in current source mode and exports the i that host computer is specifiedL=10A electric currents, in t1Moment, when bearing power reduction/generated output
When increase or superfluous generated energy, lithium battery power conversion unit switches to charge mode by current source mode, by 0.2C (iL
=-9.3A) it is charged, the charging time most long to realize lithium battery.
From in above-mentioned figure, electricity of the lithium battery power conversion unit in current source mode and charge mode handoff procedure
Inducing current spike is less, meets the safety requirements of design.
In sum, the lithium battery power conversion unit that can be used in super ups system provided by the utility model leads to
Cross and adopt rational schema management scheme to occur working in different patterns to realize not under different events in super ups system
Same function such that it is able to realize the electrical grid failure in super ups system, energy when other energy units conversion power supplies
Reach compounding practice to maintain the DC bus-bar voltage of super ups system constant, it is ensured that the power supply of load-side is stablized.Also, this reality
Can also realize that the rational charge and discharge to lithium battery are managed with new provided lithium battery power conversion unit, so as to
Enough avoid overcharging lithium battery or being crossed putting and caused expendable damage, extend the service life of lithium battery.
It is last it should be noted that：Above example is only illustrating the technical solution of the utility model, rather than it is limited
System, although being described in detail to the utility model with reference to the foregoing embodiments, it will be appreciated by those skilled in the art that it is still
Technical scheme described in previous embodiment can be modified, either which part or all technical characteristic are carried out etc.
With replacement, and these modifications or replacement, do not make the essential of appropriate technical solution depart from skill described in the utility model embodiment
The scope of art scheme.
Claims (10)
1. a kind of lithium battery power conversion unit, for super ups system, it is characterised in that include：
Lithium battery group, including the first lithium battery and the second lithium battery that are connected in series；And
Power inverter, including the first power inverter and the second power inverter,
First power inverter includes the first input capacitance, the first inductor, the first transistor, transistor seconds, the first output
Electric capacity, the first input capacitance is in parallel with the first lithium battery, and one end of the first inductor connects the positive pole of the first lithium battery, the other end
The colelctor electrode of connection the first transistor and the emitter stage of transistor seconds, the emitter stage of the first transistor connects the first lithium battery
Negative pole, one end of the first output capacitance connects the colelctor electrode of transistor seconds, and the other end connects the emitter stage of the first transistor,
Second power inverter includes the second input capacitance, the second inductor, third transistor, the 4th transistor, the second output
Electric capacity, the second input capacitance is in parallel with the second lithium battery, and one end of the second inductor connects the negative pole of the second lithium battery, the other end
The emitter stage of connection third transistor and the colelctor electrode of the 4th transistor, the colelctor electrode of third transistor connects the second lithium battery
Positive pole, one end of the second output capacitance connects the emitter stage of the 4th transistor, and the other end connects the colelctor electrode of third transistor,
In the super ups system, the emitter stage of the first transistor connects the second dc bus end, the current collection of transistor seconds
Pole connects the first dc bus end, and the colelctor electrode of third transistor connects the second dc bus end, the emitter stage of the 4th transistor
Connect the 3rd dc bus end, and
The gate pole of the first transistor is input into the first control signal, and the gate pole of transistor seconds is input into the second control signal, and the 3rd is brilliant
The gate pole of body pipe is input into the 3rd control signal, and the gate pole of the 4th transistor is input into the 4th control signal.
2. lithium battery power conversion unit as claimed in claim 1, it is characterised in that further include：
Charging inductance electric current loop, including
The electric current of the first inductor or the second inductor is flow through in inductive current input, input,
Charging current reference value input, is input into charging current reference value, and
Control signal output, export first control signal, second control signal, the 3rd control signal, with
And the 4th control signal, and
Cell voltage ring, including
Cell voltage input, is input into the cell voltage of the first lithium battery or the second lithium battery,
Cell voltage reference value input, is input into cell voltage reference value, and
Charging current output end, exports charging current,
When lithium battery power conversion unit is worked under charge mode in the super ups system, the charging current is defeated
Go out end to be connected with the charging current reference value input, and
First control signal, second control signal, the 3rd control signal, the 4th control signal control
Under system, the lithium battery group is electrically charged.
3. lithium battery power conversion unit as claimed in claim 1, it is characterised in that further include：
Electric discharge inductive current ring, including
The electric current of the first inductor or the second inductor is flow through in inductive current input, input,
Discharge current reference value input, is input into discharge current reference value, and
Control signal output, export first control signal, second control signal, the 3rd control signal, with
And the 4th control signal, and
DC bus-bar voltage ring, including
Busbar voltage input, the voltage being input between the first dc bus end and the second dc bus end or the second dc bus
Voltage between end and the 3rd dc bus end,
Busbar voltage reference value input, inlet highway voltage reference value, and
Discharge current output end, exports discharge current,
When lithium battery power conversion unit is worked under voltage source mode in the super ups system, the discharge current
Output end is connected with the discharge current reference value input, and
First control signal, second control signal, the 3rd control signal, the 4th control signal control
Under system, the lithium battery group electric discharge.
4. lithium battery power conversion unit as claimed in claim 3, it is characterised in that
When lithium battery power conversion unit is worked under current source mode in the super ups system, the discharge current
Reference value input is input into constant current value, and
First control signal, second control signal, the 3rd control signal, the 4th control signal control
Under system, the lithium battery group electric discharge.
5. lithium battery power conversion unit as claimed in claim 2, it is characterised in that further include：
Host computer；With
Mode selection part, wherein, mode selection part is after the charge mode instruction for receiving host computer output so that the charging
Current output terminal is connected with the charging current reference value input.
6. lithium battery power conversion unit as claimed in claim 3, it is characterised in that further include：
Host computer；With
Mode selection part, wherein, mode selection part is after the voltage source mode instruction for receiving host computer output so that described to put
Electric current output terminal is connected with the discharge current reference value input.
7. lithium battery power conversion unit as claimed in claim 4, it is characterised in that further include：
Host computer, wherein,
Host computer exports the constant current value to the discharge current reference value input.
8. the lithium battery power conversion unit as described in claim 2 or 5, it is characterised in that
The process that the lithium battery group is electrically charged includes：
Constant-current charging phase, in the stage, cell voltage ring filling, the charging current output end output violent change current value conduct
The charging current, until the cell voltage of the first lithium battery or the second lithium battery is moved back from the arrival of cell voltage reference value is less than
Till saturation voltage；
Constant voltage charging phase, in the stage, cell voltage ring exits saturation state, and the lithium battery group is filled with constant voltage mode
Electricity, charging current output end is exported by the calculated current value of cell voltage ring as the charging current, until described fill
Electric current is less than charge cutoff electric current；And
In the charging termination stage, in the stage, the charging current of charging current output end output is 0, the first lithium battery and the
The cell voltage of two lithium batteries is fallen after rise respectively to standing voltage.
9. the lithium battery power conversion unit as described in claim 4 or 7, it is characterised in that
The process of the lithium battery group electric discharge includes：The constant-current discharge stage, in the stage, the discharge current reference value input
The constant current value of input is not zero, and the lithium battery group constant-current discharge is until the battery electricity of the first lithium battery and the second lithium battery
Force down in discharge cut-off voltage, and
Electric discharge ending phase, in the stage, the constant current value of the discharge current reference value input input is zero, the first lithium
The cell voltage of battery and the second lithium battery gos up to standing voltage.
10. lithium battery power conversion unit as claimed in claim 1, it is characterised in that
It is double that the first transistor, the transistor seconds, the third transistor, the 4th transistor are respectively insulated gate
Bipolar transistor, and
First control signal and the 3rd control signal homophase, second control signal and the 4th control signal
Homophase, first control signal is anti-phase with second control signal, and the 3rd control signal and the described 4th control are believed
It is number anti-phase.
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| CN201621120390.7U CN206164198U (en) | 2016-10-13 | 2016-10-13 | Lithium cell power conversion unit |
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|---|---|---|---|
| CN201621120390.7U CN206164198U (en) | 2016-10-13 | 2016-10-13 | Lithium cell power conversion unit |
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| CN112994458A (en) * | 2021-03-26 | 2021-06-18 | 潍柴动力股份有限公司 | DC/DC converter, control method thereof, and fuel cell system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112994458A (en) * | 2021-03-26 | 2021-06-18 | 潍柴动力股份有限公司 | DC/DC converter, control method thereof, and fuel cell system |
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