CN109193842A - A kind of control method of direct current two-way changing device to accumulator cell charging and discharging - Google Patents
A kind of control method of direct current two-way changing device to accumulator cell charging and discharging Download PDFInfo
- Publication number
- CN109193842A CN109193842A CN201811121309.0A CN201811121309A CN109193842A CN 109193842 A CN109193842 A CN 109193842A CN 201811121309 A CN201811121309 A CN 201811121309A CN 109193842 A CN109193842 A CN 109193842A
- Authority
- CN
- China
- Prior art keywords
- voltage
- bus
- way
- direct current
- changing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000007599 discharging Methods 0.000 title claims abstract description 24
- 238000005070 sampling Methods 0.000 claims abstract description 14
- 230000003321 amplification Effects 0.000 claims abstract description 8
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 8
- 239000004065 semiconductor Substances 0.000 claims description 30
- 239000003990 capacitor Substances 0.000 claims description 17
- 238000002955 isolation Methods 0.000 claims description 15
- 239000003381 stabilizer Substances 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 6
- 238000011105 stabilization Methods 0.000 claims description 6
- 230000003993 interaction Effects 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 4
- 238000004146 energy storage Methods 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims 1
- 230000002441 reversible effect Effects 0.000 abstract description 11
- 230000002457 bidirectional effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000024241 parasitism Effects 0.000 description 2
- 101001007417 Homo sapiens LEM domain-containing protein 2 Proteins 0.000 description 1
- 102100028291 LEM domain-containing protein 2 Human genes 0.000 description 1
- 101100028967 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) PDR5 gene Proteins 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- H02J7/0077—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/337—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
Abstract
The invention discloses a kind of direct current two-way changing devices to the control method of accumulator cell charging and discharging, the direct current two-way changing device includes recommending the two-way DC/DC converter of phase-shifting full-bridge, the high-pressure side connection DC bus of the two-way DC/DC converter of phase-shifting full-bridge is recommended, low-pressure side connects battery group；The control terminal for recommending the two-way DC/DC converter of phase-shifting full-bridge is connect with the output end of drive amplification circuit, the control signal output of the input terminal connection control unit of the drive amplification circuit；The analog signal sampling end of described control unit is connect with battery current sensor, accumulator battery voltage sampled point, DC bus current sensor and DC bus-bar voltage sampled point respectively.Direct current reversible transducer of the invention is connected between battery group and DC bus, can carry out the switching of bidirectional operation mode, and the accurate control to battery charging or electric discharge both of which switching can be realized.
Description
Technical field
The present invention relates to a kind of direct current two-way changing devices to the control method of accumulator cell charging and discharging, belongs to power automation
Technical field.
Background technique
In direct-current grid, DC source, DC bus, DC load, DC converter and battery are generally comprised
Group etc., wherein battery group is the important component of direct-current grid, is that the accident of direct-current grid ensures power supply；But
Be to the management of charging and discharging of battery in existing system it is extensive, battery pack is substantially in floating charge electricity condition, and battery pack is put
Electricity is directly to discharge, and is unable to accurately control its discharge power, causes the maintenance to battery inconsiderate, and influence battery pack uses the longevity
The safe and stable operation of life and direct-current grid.In addition, existing some direct current reversible transducers are not level-one DC/DC transformation
It constitutes, is made of two DC/DC converter inverse parallels, volume is larger, and control is complicated.
Summary of the invention
A kind of control technical problem to be solved by the invention is to provide direct current two-way changing device to accumulator cell charging and discharging
Method processed, this method can realize the accurate control to battery charging or electric discharge both of which switching, and mode switch time
It is short, improve the intelligence degree of system；Meanwhile by being precisely controlled to battery group charge and discharge, DC bus ensure that
Voltage is not in biggish voltage fluctuation, while also improving the service life of battery group, ensure that direct-current grid system
The safe and stable operation of system.
In order to solve the above technical problems, the technical scheme adopted by the invention is as follows:
A kind of direct current two-way changing device includes to the control method of accumulator cell charging and discharging, the direct current two-way changing device
The two-way DC/DC converter of phase-shifting full-bridge is recommended, the high-pressure side connection DC bus of the two-way DC/DC converter of phase-shifting full-bridge is recommended,
Low-pressure side connects battery group；Recommend the control terminal of the two-way DC/DC converter of phase-shifting full-bridge and the output end of drive amplification circuit
Connection, the control signal output of the input terminal connection control unit of drive amplification circuit；The analog signal of control unit samples
End also respectively with battery current sensor, accumulator battery voltage sampled point, DC bus current sensor and DC bus
The connection of voltage sample point；
Above-mentioned direct current two-way changing device specifically comprises the following steps: the control method of accumulator cell charging and discharging
Step 1, the electric current and voltage of battery group side and DC bus side are acquired respectively；
Step 2, the voltage of DC bus side is judged, when the voltage of DC bus side is greater than charge threshold voltage
When, execute step 3；When the voltage of DC bus side is less than discharge threshold voltage, step 4 is executed；Other situations keep original
State, return step 1；
Step 3, close battery group side driving signal, open DC bus side driving signal, two-way DC/DC converter into
Enter charge mode, battery charging is given, by the extra energy storage of DC bus in battery group；In charging mode,
Starting voltage control loop section controls DC bus side driving signal, guarantees that DC bus side exports stable charging voltage
And electric current, realization are precisely controlled battery charging；
Step 4, close DC bus side driving signal, open battery group side driving signal, two-way DC/DC converter into
Enter discharge mode, battery group is discharged by two-way DC/DC converter to DC bus, guarantees the stabilization of DC bus-bar voltage；
In discharge mode, starting voltage control loop section controls the driving signal of battery group side, guarantees on high-tension side output
Voltage stabilization, realization are precisely controlled battery group electric discharge.
The control method of the voltage control loop section are as follows:
According to the difference equation of the control algolithm of digital pi regulator, the variable quantity of digital pi regulator output is obtained:
Δ u (k)=kp[e(k)-e(k-1)]+kie(k) (1)
The output of Increment Type Digital Hydraulic pi regulator are as follows:
U (k)=u (k-1)+Δ u (k) (2)
Wherein, e (k), e (k-1) are the voltage error signal at k, k-1 moment respectively, and kp, ki respectively indicate ratio system
Number, integral coefficient, numerical value is respectively 0.62,0.032；
After the voltage given value of given voltage controlling unit, pass through voltage sample continuous acquisition k and k-1 moment two-way DC/
It is compared by DC converter output voltage values with voltage given value, i.e., given value subtracts voltage sample value and obtains error letter
Number e (k), e (k-1) are substituted into (1) formula to calculate the variation delta u (k) of voltage regulator output, (2) formula are recycled to count
Calculate the output valve u (k) of voltage control loop section；
When actual output voltage increases over setting voltage, the duty ratio for controlling PWM drive signal reduces, output electricity
Pressure will decline, until stablizing in setting value；, whereas if actual output voltage declines, it is less than setting voltage, then controls PWM
The duty ratio of driving signal increases, and increases output voltage, until stablizing in output valve.
Wherein, the two-way DC/DC converter of phase-shifting full-bridge of recommending includes high-frequency isolation transformer, high-frequency isolation transformer
Both ends are separately connected high-pressure side and low-pressure side, and step down side both ends are in series with metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 respectively；Transformer
Low-pressure side middle leads are in series with inductance L1, and step down side is also parallel with filter capacitor CL；High voltage side of transformer is equipped with two
Four metal-oxide-semiconductors Q3, Q4, Q5, Q6 in parallel again, high voltage side of transformer both ends are separately connected the centre of series connection metal-oxide-semiconductor after two series connection
Position；High voltage side of transformer is also parallel with filter capacitor CH；High voltage side of transformer one end is also in series with resonant inductance Lr and blocking
Capacitor Cr.
Wherein, described control unit includes arm processor, and the arm processor pwm signal output end is separately connected MOS
The analog signal sampling end of the control terminal of pipe Q1, Q2, Q3, Q4, Q5, Q6, the arm processor passes through the shape of electric resistance partial pressure respectively
Formula connects battery current sensor, accumulator battery voltage sampled point, DC bus current sensor and DC bus-bar voltage
Sampled point.
Wherein, the driving circuit includes photoelectrical coupler, the photoelectrical coupler input terminal connection arm processor
The connection of pwm signal output end, pwm signal output end are in series with driving resistance, and pwm signal output end is also parallel with voltage-stabiliser tube.
Wherein, serial communication interface and human-computer interaction device, the human-computer interaction is also respectively connected in described control unit
Equipment also passes through network connection with external monitoring systems.
Wherein, the model SPW17N80C3 of described metal-oxide-semiconductor Q1, Q2, Q3, Q4, Q5, Q6, the type of the filter capacitor CL
Number be CD135450V/3000uF, the model TC86-305K of capacitance Cr.
Wherein, the arm processor uses STM32F101RC single-chip microcontroller.
Wherein, the model HCPL3180 of the photoelectrical coupler, the model 1N4747 of the voltage-stabiliser tube.
Control method of the present invention is made of two basic control sections: 1, voltage control division point, i.e., according to given voltage
The time that turns on and off that metal-oxide-semiconductor is adjusted with output voltage value of feedback, realize the closed-loop control to output voltage；2, two-way switching
Two-way operation mould is realized according to the size of high side voltage to control the current direction of direct current reversible transducer in control section
The automatic switchover of formula (to battery charging or electric power storage tank discharge).
Compared with the prior art, technical solution of the present invention has the beneficial effect that
The present invention recommends the metal-oxide-semiconductor work of the two-way DC/DC converter of phase-shifting full-bridge by control, realizes bidirectional operation mode
Switching, that is, realize the control to battery charging or electric discharge both of which switching, and mode switch time is short, improves and is
The intelligence degree of system；By being precisely controlled to battery group charge and discharge, it ensure that DC bus-bar voltage is not in larger
Voltage fluctuation, while also improving the service life of battery group, ensure that the safe and stable operation of DC micro power grid system；
Finally, the high frequency transformer of the device realizes the electrical isolation on former secondary side, together relative to non-isolated direct current reversible transducer
When realize the electrical isolation of DC bus and battery group, i.e. the ground fault of DC bus is not transferred to battery group one
The ground fault of side, battery group side can not be transmitted to DC bus side, improve security of system, relative to two
The reversible transducer that DC/DC converter inverse parallel is constituted, direct current two-way changing device volume of the present invention is small, and control is simple.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of direct current two-way changing device of the present invention；
Fig. 2 is the operation schematic diagram of direct current two-way changing device of the present invention in systems；
Fig. 3 recommends the two-way DC/DC converter circuit figure of phase-shifting full-bridge for direct current two-way changing device of the present invention；
Fig. 4 is the control unit circuit diagram of direct current two-way changing device of the present invention；
Fig. 5 is the circuit diagram of direct current two-way changing device driving circuit of the present invention；
Fig. 6 is flow chart of the direct current two-way changing device of the present invention to accumulator charging and discharging control method；
Fig. 7 is the closed-loop control flow chart of direct current two-way changing device voltage control loop section of the present invention.
Specific embodiment
According to following embodiments, the present invention may be better understood.However, as it will be easily appreciated by one skilled in the art that real
It applies content described in example and is merely to illustrate the present invention, without sheet described in detail in claims should will not be limited
Invention.
As shown in Fig. 1~7, direct current two-way changing device of the present invention, including the two-way DC/DC converter of phase-shifting full-bridge is recommended,
The DC bus in the high-pressure side connection direct-current grid of the two-way DC/DC converter of phase-shifting full-bridge is recommended, low-pressure side connects electric power storage
Pond group.
Wherein the DC bus-bar voltage in direct-current grid is DC400V, from three-phase alternating current rectification and photovoltaic cell
Output.Battery group is composed in series by the lead-acid accumulator of 18 section 12V 125Ah, float charge voltage DC243V.
The control terminal for recommending the two-way DC/DC converter of phase-shifting full-bridge is connect with the output end of drive amplification circuit, and driving is put
The input terminal of big circuit connects control unit, the analog signal sampling end of control unit respectively with battery current sensor,
Accumulator battery voltage sampled point, DC bus current sensor, the connection of DC bus-bar voltage sampled point.
The automatic control to converter bidirectional operation mode is realized by arm processor control circuit, is realized to battery
The accurate management of the charging and discharging of group, while battery group and DC bus are subjected to electrical isolation, limitation ground fault exists
The mutual transmitting of two sides.
Recommending the two-way DC/DC converter of phase-shifting full-bridge includes high-frequency isolation transformer T1, and the both ends transformer T1 are separately connected
High-pressure side and low-pressure side, step down side both ends are in series with metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 respectively；Draw among step down side
Line is in series with inductance L1, and step down side is also parallel with filter capacitor CL；High voltage side of transformer is equipped with after series connection two-by-two again simultaneously
Four metal-oxide-semiconductors Q3, Q4, Q5, Q6 of connection, high voltage side of transformer both ends are separately connected the middle position of series connection metal-oxide-semiconductor；Transformer is high
Pressure side is also parallel with filter capacitor CH；High voltage side of transformer one end is also in series with resonant inductance Lr and capacitance Cr.
As shown in figure 3, wherein ULFor low-pressure side voltage, CLFor low-pressure side filter capacitor, L1 is low-pressure side inductance, power tube
Q1, Q2 select metal-oxide-semiconductor, and D1, D2 are the diode of metal-oxide-semiconductor parasitism, and C1, C2 are the parasitic capacitance of metal-oxide-semiconductor；UHFor high-pressure side electricity
Pressure, T1 is high-frequency isolation transformer, CHFor filter high-pressure side filter capacitor, power tube Q3, Q4, Q5 and Q6 select metal-oxide-semiconductor, D3,
D4, D5, D6 be metal-oxide-semiconductor parasitism diode, C3, C4, C5 and C6 be metal-oxide-semiconductor parasitic capacitance, Lr be resonant inductance, Cr for every
Straight capacitor.
Recommend the model of metal-oxide-semiconductor Q1, Q2, Q3, Q4, Q5, Q6 of the two-way DC/DC converter of phase-shifting full-bridge
SPW17N80C3, filter capacitor CLModel CD135 450V/3000uF, capacitance Cr model TC86-305K.
High-frequency isolation transformer T1 realize former secondary side electrical isolation (output voltage of transformer is just secondary voltage,
It is original edge voltage in input side's (meeting power supply side) of transformer), while realizing the electrical isolation of DC bus and battery group, i.e.,
The ground fault of DC bus cannot be transmitted to battery side, and the ground fault of battery group side can not be transmitted to direct current
Bus side.
According to the amount of capacity situation of battery group, direct current two-way changing device can be single or multiple unit parallel connection works
Make, realizes the charge control and control of discharge to battery group.
Wherein, control unit includes arm processor.The model STM32F101RC of arm processor, crystal oscillator frequency are
16M.Arm processor pwm signal output port is separately connected the control terminal of metal-oxide-semiconductor Q1, Q2, Q3, Q4, Q5, Q6, arm processor
Analog signal sampling end respectively by way of electric resistance partial pressure connect battery current sensor, accumulator battery voltage sampling
Point, DC bus current sensor, DC bus-bar voltage sampled point.Wherein, the model LT108-S7 of current sensor.
As shown in figure 4, ULFor low-pressure side voltage sampling, ILFor low-pressure side electric current, LEM1, LEM2 are current sensor, Y table
Show crystal oscillator, C1, C2 are crystal oscillator capacitor, and R1, R2, R3, R4, R5, R6 are sampling resistor, PWM1, PWM2 of arm processor, PWM3,
PWM4, PWM5 and PWM6 signal are controlled by the driving circuit of Fig. 4 recommends six of the two-way DC/DC converter of phase-shifting full-bridge
Metal-oxide-semiconductor, AD sample port AN0, AN1, AN2, AN3 of arm processor acquire respectively the low-pressure side voltage of direct current reversible transducer,
High side voltage, high voltage side current and low-pressure side electric current；The port 485TX and 485RX of arm processor is that RS-485 communication connects
Mouthful, realize the communication with external monitoring systems, arm processor passes through its SPI communication interface (SDI, SCK, SDO) and human-computer interaction
Equipment realizes data communication, and convenient data on the spot show, fault inquiry and parameter setting.
Wherein, driving circuit includes photoelectrical coupler (optocoupler), and photoelectrical coupler input terminal connects the PWM of arm processor
Signal output end connection；Output end is in series with driving resistance, and output end is also parallel with voltage-stabiliser tube.The model of isolation amplification optocoupler
HCPL3180, the model 1N4747 of voltage-stabiliser tube.
As shown in figure 5, the pwm signal that control unit generates is small signal, after optocoupler amplifies, one big letter is obtained
Number, for driving turning on and off for metal-oxide-semiconductor.R1 is current-limiting resistance, is connected with the diode end of optocoupler, and the secondary side of optocoupler is additional
One power supply VCC provides a high voltage, and capacitor C1 is filter capacitor, and capacitor R2 is the driving resistance of metal-oxide-semiconductor, voltage-stabiliser tube VD1
For limiting the gate-source voltage of metal-oxide-semiconductor, metal-oxide-semiconductor high electrical breakdown is prevented.
The working principle of the present apparatus and the control of the management of charging and discharging of battery group is achieved in that
Direct current reversible transducer is connected to respectively between battery group and DC bus, and the charge and discharge to battery group may be implemented
Fulgurite reason control, according to the flow diagram of Fig. 6, after each module and parameter initialization, arm processor control circuit passes through itself
The acquisition of AD unit high-pressure side and low-pressure side voltage, data processing and data operation are carried out, by judging on high-tension side voltage
Whether reach the voltage value of setting to open charge mode, after entering charge mode, continues to judge that high side voltage is
It is no to be less than setting value to open electric discharge operating mode, i.e., direct current two-way changing is determined by the sampling judgement to high side voltage
The operating mode of device is realized and is controlled the management of charging and discharging of battery group in direct-current grid, improves the work of battery group
Property and utilization rate.
Since there are high-frequency isolation transformers inside two-way DC/DC converter, DC bus side and battery may be implemented
The electrical isolation of group side, ensure that and not interfered with when ground fault occur in any side by the other side.In addition, in DC micro-electric
In net, when DC bus energy deficiency, for the power supply continuity for guaranteeing DC load, battery group passes through direct current reversible transducer
It discharges to DC bus, improves the power supply reliability of direct current system.
The switching of direct current reversible transducer operating mode:
The on high-tension side voltage of AD instance sample, by allowing direct current reversible transducer to be in determine compared with setting value
Which kind of operating mode, Assured Mode switching are normally carried out.
When DC bus-bar voltage is high:
AD samples high side voltage, and compared with the given threshold that charges, if more than setting value, then arm processor is closed low
Side driving signal is pressed, high-pressure side driving signal is opened, DC converter enters charge mode, battery charging is given, by direct current
The extra energy storage of bus is in battery group；The output voltage of the low-pressure side of AD sampling simultaneously, by the tune of voltage control loop
Section effect guarantees the output of low-pressure side stable charging voltage and electric current, realizes the accurate control to battery charging；
When DC bus-bar voltage is low:
AD samples high side voltage, and compared with given threshold of discharging, if being less than setting value, arm processor is closed high
Side driving signal is pressed, low-pressure side driving signal is opened, DC converter enters discharge mode, and battery group passes through the two-way change of direct current
Parallel operation discharges to DC bus, guarantees the stabilization of DC bus-bar voltage；AD samples on high-tension side output voltage simultaneously, through overvoltage
The adjustment effect of control ring, guarantees on high-tension side output voltage stabilization, and realization is precisely controlled battery group electric discharge.
After system electrification, digital control circuit is started to work, and arm processor initialization starts to execute software program；Pass through
AD sampling unit acquires the voltage of high and low pressure side, lays the foundation for software calculating, executes voltage control loop knot in major cycle
Program.
The specific implementation step of this control method:
Step 1, the electric current and voltage of battery group side and DC bus side are acquired respectively；
Step 2, the voltage of DC bus side is judged, when the voltage of DC bus side is greater than charge threshold voltage
When, execute step 3；When the voltage of DC bus side is less than discharge threshold voltage, step 4 is executed；Other situations keep original
State, return step 1；
Step 3, battery group side driving signal is closed, DC bus side driving signal is opened, DC converter, which enters, to be filled
Power mode gives battery charging, by the extra energy storage of DC bus in battery group；In charging mode, start
Voltage control loop section controls DC bus side driving signal, guarantees that DC bus side exports stable charging voltage and electricity
Stream realizes the accurate control to battery charging；
Step 4, DC bus side driving signal is closed, battery group side driving signal is opened, DC converter, which enters, to be put
Power mode, battery group are discharged by direct current reversible transducer to DC bus, guarantee the stabilization of DC bus-bar voltage；It is discharging
Under mode, starting voltage control loop section controls the driving signal of battery group side, guarantees that on high-tension side output voltage is steady
Fixed, realization is precisely controlled battery group electric discharge.
Wherein, the control method of voltage control loop section are as follows:
According to the difference equation of the control algolithm of digital pi regulator, the variable quantity of digital pi regulator output is obtained:
Δ u (k)=kp[e(k)-e(k-1)]+kie(k) (1)
The output of Increment Type Digital Hydraulic pi regulator are as follows:
U (k)=u (k-1)+Δ u (k) (2)
After the voltage given value (such as 2.5V) of given voltage controlling unit, pass through voltage sample continuous acquisition k and k-1 moment
It is compared by converter output voltage values with the voltage given value, i.e., the described given value, which subtracts voltage sample, to be worth
To error signal e (k), e (k-1).(1) formula is substituted into calculate the variation delta u (k) of voltage regulator output, is recycled
(2) formula calculates the output valve u (k) of voltage control loop section, wherein e (k), e (k-1) are the voltage error at k, k-1 moment respectively
Signal value, kp, ki respectively indicate proportionality coefficient, integral coefficient, and numerical value is respectively 0.62,0.032.
The adjustment process of output voltage is as follows: being more than setting voltage, then the voltage of AD sampling is believed if output voltage increases
Number numerical value just will increase, compared with given voltage value, error signal is changing to negative value, and the output valve of adjuster will subtract
Small, the duty ratio of PWM drive signal will reduce, and output voltage will decline, until stablizing in setting value；, whereas if defeated
Voltage declines out, is less than setting voltage, then the output voltage values of AD sampling will be less than setting voltage, and the voltage compared misses
Difference signal is positive value, and the output valve of adjuster just will increase, and the duty ratio of PWM drive signal just will increase, and output voltage will
Increase, until stablizing in output valve.I.e. when actual output voltage increases over setting voltage, PWM drive signal is controlled
Duty ratio reduces, and guarantees that output voltage will decline, until stablizing in setting value., whereas if actual output voltage declines, it is small
In setting voltage, then the duty ratio for controlling PWM drive signal increases, and increases output voltage, until stablizing in output valve.
Claims (9)
1. a kind of direct current two-way changing device is to the control method of accumulator cell charging and discharging, it is characterised in that: the two-way change of direct current
Changing device includes recommending the two-way DC/DC converter of phase-shifting full-bridge, recommends the high-pressure side connection of the two-way DC/DC converter of phase-shifting full-bridge
DC bus, low-pressure side connect battery group；Recommend the control terminal and drive amplification circuit of the two-way DC/DC converter of phase-shifting full-bridge
Output end connection, drive amplification circuit input terminal connection control unit control signal output；The simulation of control unit
Signal sampling end also respectively with battery current sensor, accumulator battery voltage sampled point, DC bus current sensor and
The connection of DC bus-bar voltage sampled point；
Above-mentioned direct current two-way changing device specifically comprises the following steps: the control method of accumulator cell charging and discharging
Step 1, the electric current and voltage of battery group side and DC bus side are acquired respectively；
Step 2, the voltage of DC bus side is judged, when the voltage of DC bus side is greater than charge threshold voltage, is held
Row step 3；When the voltage of DC bus side is less than discharge threshold voltage, step 4 is executed；Other situations keep original state,
Return step 1；
Step 3, battery group side driving signal is closed, DC bus side driving signal is opened, two-way DC/DC converter, which enters, to be filled
Power mode gives battery charging, by the extra energy storage of DC bus in battery group；In charging mode, start
Voltage control loop section controls DC bus side driving signal, guarantees that DC bus side exports stable charging voltage and electricity
Stream, realization are precisely controlled battery charging；
Step 4, DC bus side driving signal is closed, battery group side driving signal is opened, two-way DC/DC converter, which enters, to be put
Power mode, battery group are discharged by two-way DC/DC converter to DC bus, guarantee the stabilization of DC bus-bar voltage；It is putting
Under power mode, starting voltage control loop section controls the driving signal of battery group side, guarantees on high-tension side output voltage
Stablize, realization is precisely controlled battery group electric discharge.
2. direct current two-way changing device according to claim 1 is to the control method of accumulator cell charging and discharging, it is characterised in that:
The control method of the voltage control loop section are as follows:
According to the difference equation of the control algolithm of digital pi regulator, the variable quantity of digital pi regulator output is obtained:
Δ u (k)=kp[e(k)-e(k-1)]+kie(k) (1)
The output of Increment Type Digital Hydraulic pi regulator are as follows:
U (k)=u (k-1)+Δ u (k) (2)
Wherein, e (k), e (k-1) are the voltage error signal at k, k-1 moment respectively, and kp, ki respectively indicate proportionality coefficient, product
Divide coefficient, numerical value is respectively 0.62,0.032；
After the voltage given value of given voltage controlling unit, become by voltage sample continuous acquisition k and k-1 moment two-way DC/DC
It is compared by parallel operation output voltage values with voltage given value, i.e., given value subtracts voltage sample value and obtains error signal e
(k), e (k-1) is substituted into (1) formula to calculate the variation delta u (k) of voltage regulator output, (2) formula is recycled to calculate
The output valve u (k) of voltage control loop section；
When actual output voltage increases over setting voltage, the duty ratio for controlling PWM drive signal reduces, and output voltage is just
It can decline, until stablizing in setting value；, whereas if actual output voltage declines, it is less than setting voltage, then controls PWM driving
The duty ratio of signal increases, and increases output voltage, until stablizing in output valve.
3. direct current two-way changing device according to claim 1 is to the control method of accumulator cell charging and discharging, it is characterised in that:
The two-way DC/DC converter of phase-shifting full-bridge of recommending includes high-frequency isolation transformer, and high-frequency isolation transformer both ends are separately connected
High-pressure side and low-pressure side, step down side both ends are in series with metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 respectively；Draw among step down side
Line is in series with inductance L1, and step down side is also parallel with filter capacitor CL；High voltage side of transformer is equipped with after series connection two-by-two again simultaneously
Four metal-oxide-semiconductors Q3, Q4, Q5, Q6 of connection, high voltage side of transformer both ends are separately connected the middle position of series connection metal-oxide-semiconductor；Transformer is high
Pressure side is also parallel with filter capacitor CH；High voltage side of transformer one end is also in series with resonant inductance Lr and capacitance Cr.
4. direct current two-way changing device according to claim 3 is to the control method of accumulator cell charging and discharging, it is characterised in that:
Described control unit include arm processor, the arm processor pwm signal output end be separately connected metal-oxide-semiconductor Q1, Q2, Q3, Q4,
The control terminal of Q5, Q6, the analog signal sampling end of the arm processor connect battery group by way of electric resistance partial pressure respectively
Current sensor, accumulator battery voltage sampled point, DC bus current sensor and DC bus-bar voltage sampled point.
5. direct current two-way changing device according to claim 4 is to the control method of accumulator cell charging and discharging, it is characterised in that:
The driving circuit includes photoelectrical coupler, the pwm signal output end of the photoelectrical coupler input terminal connection arm processor；
Pwm signal output end is in series with driving resistance, and pwm signal output end is also parallel with voltage-stabiliser tube.
6. direct current two-way changing device according to claim 1 is to the control method of accumulator cell charging and discharging, it is characterised in that:
Serial communication interface and human-computer interaction device is also respectively connected in described control unit, and the human-computer interaction device also supervises with outside
Control system passes through network connection.
7. direct current two-way changing device according to claim 3 is to the control method of accumulator cell charging and discharging, it is characterised in that:
The model SPW17N80C3 of described metal-oxide-semiconductor Q1, Q2, Q3, Q4, Q5, Q6, filter capacitor CLModel CD135 450V/
The model TC86-305K of 3000uF, capacitance Cr.
8. direct current two-way changing device according to claim 4 is to the control method of accumulator cell charging and discharging, it is characterised in that:
The arm processor uses STM32F101RC single-chip microcontroller.
9. direct current two-way changing device according to claim 5 is to the control method of accumulator cell charging and discharging, it is characterised in that:
The model HCPL3180 of the photoelectrical coupler, the model 1N4747 of the voltage-stabiliser tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811121309.0A CN109193842A (en) | 2018-09-25 | 2018-09-25 | A kind of control method of direct current two-way changing device to accumulator cell charging and discharging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811121309.0A CN109193842A (en) | 2018-09-25 | 2018-09-25 | A kind of control method of direct current two-way changing device to accumulator cell charging and discharging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109193842A true CN109193842A (en) | 2019-01-11 |
Family
ID=64906242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811121309.0A Pending CN109193842A (en) | 2018-09-25 | 2018-09-25 | A kind of control method of direct current two-way changing device to accumulator cell charging and discharging |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109193842A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110138075A (en) * | 2019-04-10 | 2019-08-16 | 国网江苏省电力有限公司南通供电分公司 | Highly compatible alternating current-direct current mixes distribution system |
| CN110957925A (en) * | 2019-12-17 | 2020-04-03 | 武汉合康动力技术有限公司 | Vehicle-mounted isolated emergency bidirectional DCDC system |
| CN114268145A (en) * | 2021-12-02 | 2022-04-01 | 中国电子科技集团公司第十八研究所 | Droop control-based charge-discharge regulator and regulation method |
| CN114825407A (en) * | 2022-06-22 | 2022-07-29 | 锦浪科技股份有限公司 | Charging and discharging switching method, device, system and medium of bidirectional converter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843035A (en) * | 2012-09-19 | 2012-12-26 | 南京国臣信息自动化技术有限公司 | Transformer control method with precise voltage and current limitation and maximum power point tracking functions |
| CN104167925A (en) * | 2014-09-01 | 2014-11-26 | 南京理工大学 | Two-way direct-current converter based on phase-shifted full bridge and synchronous rectification |
| US20150180342A1 (en) * | 2012-07-20 | 2015-06-25 | Zte Corporation | Circuit for Paralleled Power Supply Module to Implement Automatic Current-Sharing in Proportion |
| CN105024582A (en) * | 2015-07-27 | 2015-11-04 | 江苏大学 | Novel two-stage bidirectional energy storage converter control system and control method thereof |
| CN105790429A (en) * | 2016-04-28 | 2016-07-20 | 上海电机学院 | Low-power uninterrupted power source based on bidirectional DC-DC converter and control method thereof |
| CN106787775A (en) * | 2016-12-30 | 2017-05-31 | 深圳市崧盛电子股份有限公司 | A kind of bidirectional, dc converter and its control method |
-
2018
- 2018-09-25 CN CN201811121309.0A patent/CN109193842A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150180342A1 (en) * | 2012-07-20 | 2015-06-25 | Zte Corporation | Circuit for Paralleled Power Supply Module to Implement Automatic Current-Sharing in Proportion |
| CN102843035A (en) * | 2012-09-19 | 2012-12-26 | 南京国臣信息自动化技术有限公司 | Transformer control method with precise voltage and current limitation and maximum power point tracking functions |
| CN104167925A (en) * | 2014-09-01 | 2014-11-26 | 南京理工大学 | Two-way direct-current converter based on phase-shifted full bridge and synchronous rectification |
| CN105024582A (en) * | 2015-07-27 | 2015-11-04 | 江苏大学 | Novel two-stage bidirectional energy storage converter control system and control method thereof |
| CN105790429A (en) * | 2016-04-28 | 2016-07-20 | 上海电机学院 | Low-power uninterrupted power source based on bidirectional DC-DC converter and control method thereof |
| CN106787775A (en) * | 2016-12-30 | 2017-05-31 | 深圳市崧盛电子股份有限公司 | A kind of bidirectional, dc converter and its control method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110138075A (en) * | 2019-04-10 | 2019-08-16 | 国网江苏省电力有限公司南通供电分公司 | Highly compatible alternating current-direct current mixes distribution system |
| CN110957925A (en) * | 2019-12-17 | 2020-04-03 | 武汉合康动力技术有限公司 | Vehicle-mounted isolated emergency bidirectional DCDC system |
| CN114268145A (en) * | 2021-12-02 | 2022-04-01 | 中国电子科技集团公司第十八研究所 | Droop control-based charge-discharge regulator and regulation method |
| CN114825407A (en) * | 2022-06-22 | 2022-07-29 | 锦浪科技股份有限公司 | Charging and discharging switching method, device, system and medium of bidirectional converter |
| CN114825407B (en) * | 2022-06-22 | 2022-10-18 | 锦浪科技股份有限公司 | Charging and discharging switching method, device, system and medium of bidirectional converter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109193842A (en) | A kind of control method of direct current two-way changing device to accumulator cell charging and discharging | |
| CN104600799B (en) | A kind of series battery equalizing circuit and equalization methods | |
| CN103248242B (en) | Grid-controlled electron gun digital power supply for medical electron linear accelerator | |
| CN102710000A (en) | Parallel current sharing circuit of charging module of electric automobile charger | |
| CN104184180A (en) | Electronic cigarette high-efficient charging device and method | |
| CN104868477B (en) | A kind of voltage controlling device and method based on Mobile energy storage power station and on-load voltage regulating device | |
| CN107394864A (en) | A kind of accumulator of electric car charging and discharging state monitoring system | |
| CN105186717A (en) | High efficiency wireless charging system based on lead-acid cell | |
| CN104600775A (en) | Storage battery activation grid-connected discharging device | |
| CN103501018B (en) | Based on mixed energy storage system and the power smooth method of fuzzy algorithmic approach and DSP | |
| CN206481220U (en) | Two-way DC DC converters | |
| CN209592991U (en) | A kind of voltage dip abatement equipment based on alternating current-direct current hybrid power supply technology | |
| CN114189007B (en) | Vehicle-mounted charger working mode switching control method and device and vehicle-mounted charger | |
| CN207218249U (en) | A kind of intelligent balance pressure regulation harmonic elimination comprehensive treatment device | |
| CN202872643U (en) | Electric automobile vehicular charger and resonance circuit device | |
| Wambsganss et al. | Inductive power transmission system with stabilized output voltage using local primary-and secondary-side control | |
| CN207166158U (en) | A kind of efficient electricity getting device for ultra-high-tension power transmission line | |
| CN204597483U (en) | A kind of voltage controlling device based on Mobile energy storage power station and Loading voltage regulator | |
| CN202586744U (en) | Vehicle direct current converter | |
| CN202679228U (en) | Capacitor charging circuit | |
| CN205509881U (en) | Net DC power supply is joined in marriage to dual just sharp soft switch of formula | |
| TWI593212B (en) | Smart battery quick balancer | |
| CN109177780A (en) | A kind of charge control method, device and electric car | |
| CN209217956U (en) | A kind of direct current two-way changing device applied to direct-current grid | |
| CN201813582U (en) | Photovoltaic electricity generation controller used for LED public lighting system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190111 |
|
| RJ01 | Rejection of invention patent application after publication |