CN107069695A - A kind of mixed energy storage system and its control method based on double active full-bridge converters - Google Patents
A kind of mixed energy storage system and its control method based on double active full-bridge converters Download PDFInfo
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- CN107069695A CN107069695A CN201710429836.7A CN201710429836A CN107069695A CN 107069695 A CN107069695 A CN 107069695A CN 201710429836 A CN201710429836 A CN 201710429836A CN 107069695 A CN107069695 A CN 107069695A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
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Abstract
The invention discloses one kind based on double active full-bridge converter mixed energy storage systems and its control method：By super capacitor, lithium battery, double active full-bridge converters, Buck/Boost reversible transducers and dc bus are constituted, and two kinds of energy storage devices form a kind of mixed energy storage system of cascade connection type.Super capacitor is connected by double active full-bridge converters with dc bus, using phase shift closed-loop control, by gathering DC bus-bar voltage information, mixed energy storage system power output is automatically adjusted, with stable DC busbar voltage.Lithium battery is connected by Buck/Boost reversible transducers with super capacitor, using Double closed-loop of voltage and current, the auto charge and discharge of lithium battery is controlled by gathering the voltage of super capacitor, the voltage of super capacitor is set to maintain in operating voltage range, indirect compensation is carried out to direct-current grid power swing, to reduce lithium battery operating frequency, effectively extend its service life.
Description
Technical field
The present invention relates to direct-current grid hybrid energy-storing field, specifically a kind of mixing based on double active full-bridge converters
Energy-storage system and its control method.
Background technology
With the serious aggravation and the increasingly increase of new energy demand of problem of environmental pollution, the development of DC micro-electric network technology
Increasing concern is obtained.Micro-capacitance sensor be it is a kind of by distributed power source, load, energy storage device, converters with
And monitoring and protecting device organic combination together be transported to electric system.In direct-current grid, due to distributed power source output work
The intermittence and randomness of rate, energy-storage system turn into the important component of direct-current grid, for maintaining in direct-current grid
The power-balance in portion, and stable DC busbar voltage.Mixed energy storage system is excellent in performance using super capacitor and lithium battery
Gesture is complementary, and they are used in mixed way, dc bus is connected to by interface converter, by using rational control strategy,
Improve the overall performance of energy-storage system.Energy-storage system is connected by two-way DC/DC converters with dc bus, straight by collection
Busbar voltage information and the running status of energy-storage system are flowed, to control the discharge and recharge of energy-storage system.Relevant scholar devises use
Super capacitor and lithium battery are connected to dc bus by two Buck/Boost reversible transducers respectively, then two parts are in parallel
Mixed energy storage system.Typically in the case where voltage transformation class requirement is relatively low, there is circuit using this mixed energy storage system
Simple in construction, circuit element is few, the easy advantage of control mode.But under higher voltage transformation class requirement, due to Buck/
The boosting of Boost reversible transducers is smaller, and switching loss is big so that the rated voltage of energy storage device must be improved, and brings storage
Imbalance problem between energy equipment monomer.And the storage being directly connected to using Buck/Boost reversible transducers and dc bus
Energy system, without electrical isolation performance, the security of energy-storage system is relatively low.Therefore a kind of new hybrid energy-storing system of invention is needed
System, solves problem present in existing mixed energy storage system, to improve the overall operation performance of mixed energy storage system.
The content of the invention
The present invention is small in order to solve transformation ratio in existing mixed energy storage system, lacks electrical isolation performance, and lithium battery fills
Electric discharge is frequent, and there is provided a kind of mixed energy storage system based on double active full-bridge converters and its controlling party the problem of short life
Method.
The present invention is achieved through the following technical solutions.
A kind of mixed energy storage system based on double active full-bridge converters, including super capacitor, lithium battery, double active full-bridges
Converter, Buck/Boost reversible transducers；The super capacitor is connected by double active full-bridge converters with dc bus, institute
State double active full-bridge converters and use phase shift closed-loop control；The lithium battery passes through Buck/Boost reversible transducers and super electricity
Hold connection, described Buck/Boost reversible transducers use Double closed-loop of voltage and current.
Above two energy storage device is combined to form a kind of mixed energy storage system of cascade connection type.
A kind of control method of the mixed energy storage system based on double active full-bridge converters is as follows：
The control method of double active full-bridge converters is：Phase shift closed-loop control, that is, set mixed energy storage system and give reference voltageU refWith DC bus-bar voltageU dcVoltage PI regulator is sent into compared to after, voltage PI regulator output valve is obtained after limiter
Go out phase shift dutycycleD 1Value, then phase shift dutycycleD 1PWM waveform by the output of phase-shift PWM generator Jing Guo phase shift is to double
The switching tube of active full-bridge converter carries out phase-shift PWM modulation.Double active full-bridge converters are phase shift closed-loop control, it is therefore an objective to logical
DC bus-bar voltage information is crossed, mixed energy storage system power output is automatically adjusted, with stable DC busbar voltage.
The control method of Buck/Boost reversible transducers is：Double closed-loop of voltage and current, that is, set super capacitor and give
Determine reference voltageU sc_refWith super-capacitor voltageU scVoltage PI regulator, voltage PI regulator output valve warp are sent into compared to after
Show that lithium battery refers to output current after overcurrent limiterI bat_ref, then with lithium battery output currentI batSent into compared to after
Electric current pi regulator, electric current pi regulator output valve as Buck/Boost reversible transducers dutyfactor valueD 2, then duty
RatioD 2PWM waveform is exported by PWM generator, and PWM is carried out to the switching tube of Buck/Boost reversible transducers.Buck/
Boost reversible transducers are Double closed-loop of voltage and current, it is therefore an objective to control the automatic of lithium battery according to the voltage of super capacitor
Discharge and recharge, makes the voltage of super capacitor maintain in operating voltage range, and indirect compensation is carried out to direct-current grid power swing,
To reduce lithium battery operating frequency, effectively extend its service life.
The control method of super capacitor is：The working condition for setting super capacitor and double active full-bridge converters judges area
Between, it is designed specifically to：Set DC bus-bar voltageU DCFor its rated voltage, subregion is carried out to it,U LD3<U LD2<U LD1<U DC<U HD1
<U HD2<U HD3For the voltage threshold of double active full-bridge converter work.[U LD3,U LD2) it is LD（Limited Discharge, current limliting
Electric discharge）Interval, [U LD2,U LD1] it is D（Discharge, electric discharge）Interval, (U LD1,U HD1) it is S（Space, it is idle）Interval, [U HD1,U HD2] it is C（Charge, charging）Interval, (U HD2,U HD3] it is LC（Limited Charge, current-limiting charge）It is interval.U HD3WithU LD3
Corresponding busbar voltage extreme value when respectively straight-flow system can keep normally running.U HD2WithU LD2Respectively mixed energy storage system
Charging current and discharge current busbar voltage corresponding when reaching capacity, to ensure the work of mixed energy storage system well,U HD2
WithU LD2± the 5% of dc bus rated voltage should be generally taken within the maximum fluctuation scope that busbar voltage allows.U HD1WithU LD1Respectively mixed energy storage system initiation of charge and electric discharge charge threshold level, to avoid DC bus-bar voltageU dcIt is normal to produce
The frequent movement of double active full-bridge converters, generally takes ± 1% ~ ± the 2% of dc bus rated voltage during the fluctuation of very little.U dcFor
DC bus-bar voltage actual value, the working condition of super capacitor is：
（1）WhenU dcIn LD is interval, DC bus-bar voltage is less than reference value, and super capacitor is operated in current limliting discharge condition, passed through
Double active full-bridge converters, dc bus is given the energy to maximum discharge current；
（2）WhenU dcIn D is interval, DC bus-bar voltage is less than reference value, and super capacitor is operated in discharge condition, had by double
Source full-bridge converter, dc bus is given the energy to the discharge current that phase shifting control is modulated；
（3）WhenU dcIn S is interval, DC bus-bar voltage is stable near reference value, and super capacitor is operated in idle condition, no
Energy exchange is carried out with dc bus；
（4）WhenU dcIn C is interval, DC bus-bar voltage is higher than reference value, and super capacitor is operated in charged state, had by double
Source full-bridge converter, the charging current modulated with phase shifting control absorbs the energy of dc bus；
（5）WhenU dcIn LC is interval, DC bus-bar voltage is higher than reference value, and super capacitor is operated in current-limiting charge state, passed through
Double active full-bridge converters, the energy of dc bus is absorbed with maximum charging current.
The control method of the lithium battery is：The working condition for setting lithium battery and Buck/Boost reversible transducers judges
Interval, is designed specifically to：Set super-capacitor voltageU SCFor its reference voltage, subregion is carried out to it,U LS3<U LS2<U LS1<U SC<U HS1<U HS2<U HS3The voltage threshold worked for Buck/Boost reversible transducers.[U LS3,U LS2) for LD it is interval, [U LS2,U LS1] be
D is interval, (U LS1,U HS1) for S it is interval, [U HS1,U HS2] for C it is interval, (U HS2,U HS3] it is LC interval.U HS3WithU LS3It is respectively super
Corresponding voltage extremity when electric capacity can keep normally running, is generally determined by the self character of super capacitor.Super-capacitor voltage
Reference valueU SCFor the voltage corresponding to its state-of-charge half.U HS2WithU LS2Respectively the current limliting of lithium battery defined is discharged and filled
Magnitude of voltage corresponding to electricity, generally takes voltage set by super-capacitor voltageU SC± 60% ~ ± 80%.U HD1WithU LD1Respectively lithium
Battery initiation of charge and the charge threshold level of electric discharge, the value are combined by the capacity ratio of lithium battery in system and super capacitor and needed
The charging and discharging lithium battery frequency to be set is determined, generally takes voltage set by super-capacitor voltageU SC± 10% ~ ± 50%, it is set
Fixed [U LS1,U HS1] scope is narrower, charging and discharging lithium battery number of times is more frequent.Citing：Super capacitor rated voltage 48V, according to super
Level electric capacity regulation settingU LS3=4V,U HS3=50V,U SC=24V, [U LS1,U HS1] take setting voltageU SC± 50%, thenU LS1=12V,U HS1=When 36V, super capacitor actual value and bigger reference value difference, charging and discharging lithium battery electric current is bigger, configures lithium battery defined
Current limliting electric discharge and the corresponding magnitude of voltage of charging beU SC± 80%, thenU LS2=4.8V,U HS2=43.2V。U scIt is real for super capacitor
Border voltage, the working condition of lithium battery is：
（1）WhenU scIn LD is interval, super-capacitor voltage is less than reference value, and lithium battery is operated in current limliting discharge condition, passed through
Buck/Boost reversible transducers, super capacitor is given the energy to maximum discharge current；
（2）WhenU scIn D is interval, super-capacitor voltage is less than reference value, and lithium battery is operated in discharge condition, passes through Buck/
Boost reversible transducers, super capacitor is given the energy to the discharge current that double-closed-loop control is modulated；
（3）WhenU scIn S is interval, super-capacitor voltage is stable, and lithium battery is operated in idle condition near reference value, not with
Super capacitor carries out energy exchange；
（4）WhenU scIn C is interval, super-capacitor voltage is higher than reference value, and lithium battery is operated in charged state, passes through Buck/
Boost reversible transducers, the charging current modulated with double-closed-loop control absorbs the energy of super capacitor；
（5）WhenU scIn LC is interval, super-capacitor voltage is higher than reference value, and lithium battery is operated in current-limiting charge state, passed through
Buck/Boost reversible transducers, the energy of super capacitor is absorbed with maximum charging current.
A kind of above-mentioned mixed energy storage system based on double active full-bridge converters, lithium battery and Buck/Boost is two-way
Converter is integrated into module I, super capacitor and double active full-bridge converters is integrated into module II, module I is integrated with module II
For energy-storage module, energy-storage module is suitably matched according to the requirement of straight-flow system, then by energy-storage module in dc bus
On according to proportioning carry out parallel configuration.
Above-mentioned a kind of mixed energy storage system and its control method based on double active full-bridge converters provided by the present invention,
Compared with prior art, have the advantage that and be with beneficial effect：（1）By double active full-bridge converters by energy storage device with
Dc bus is attached, and with good electrical isolation performance, improves the security reliability of mixed energy storage system；（2）It is double
There is active full-bridge converter high step-up ratio can reduce the rated voltage of energy storage device, reduces energy-storage units series connection and excessively causes
Imbalance problem；（3）Described mixed energy storage system charge and discharge control scheme can make the lithium battery micro- electricity of compensating direct current indirectly
The power swing of net, effectively reduces its operating frequency and extends its service life.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the mixed energy storage system based on double active full-bridge converters of the present invention.
Fig. 2 is the phase shift closed-loop control system structural representation of double active full-bridge converters in the present invention.
Fig. 3 is the Double closed-loop of voltage and current structural representation of Buck/Boost reversible transducers in the present invention.
Fig. 4 is DC bus-bar voltage subregion schematic diagram in the present invention.
Fig. 5 is super-capacitor voltage subregion schematic diagram in the present invention.
In Fig. 4：U DCRepresent dc bus rated voltage；I ES_lim1Represent the limit value of the discharge current of mixed energy storage system；I ES_lim2Represent the limit value of the discharge current of mixed energy storage system.
In Fig. 5：U SCRepresent super capacitor rated voltage；I bat_lim1Represent the limit value of the discharge current of lithium battery；I bat_lim2
Represent the limit value of the discharge current of lithium battery.
Embodiment
The embodiment to the present invention is illustrated below in conjunction with the accompanying drawings.
A kind of mixed energy storage system based on double active full-bridge converters, as shown in Figure 1：Including super capacitor, lithium battery,
Double active full-bridge converters, Buck/Boost reversible transducers；The super capacitor passes through double active full-bridge converters and direct current
Bus is connected, and double active full-bridge converters use phase shift closed-loop control；The lithium battery passes through the two-way changes of Buck/Boost
Parallel operation is connected with super capacitor, and described Buck/Boost reversible transducers use Double closed-loop of voltage and current.
Above two energy storage device is combined to form a kind of mixed energy storage system of cascade connection type.
The control method of the above-mentioned mixed energy storage system based on double active full-bridge converters is as follows：
The control method of double active full-bridge converters is：Phase shift closed-loop control, as shown in Fig. 2 i.e. setting mixed energy storage system is given
Determine reference voltageU refWith DC bus-bar voltageU dcVoltage PI regulator is sent into compared to after, voltage PI regulator output valve is passed through
Phase shift dutycycle is drawn after limiterD 1Value, then phase shift dutycycleD 1Exported by phase-shift PWM generator by phase shift
PWM waveform carries out phase-shift PWM modulation to the switching tube of double active full-bridge converters.Double active full-bridge converters are phase shift closed loop control
System, it is therefore an objective to by DC bus-bar voltage information, automatically adjust mixed energy storage system power output, with stable DC bus electricity
Pressure.
The control method of Buck/Boost reversible transducers is：Double closed-loop of voltage and current, as shown in figure 3, setting
Super capacitor gives reference voltageU sc_refWith super-capacitor voltageU scVoltage PI regulator, voltage PI regulations are sent into compared to after
Device output valve show that lithium battery refers to output current after current limiterI bat_ref, then with lithium battery output currentI batPhase
More afterwards send into electric current pi regulator, electric current pi regulator output valve as Buck/Boost reversible transducers dutyfactor valueD 2, then dutyfactor valueD 2PWM waveform is exported by PWM generator, and PWM is carried out to the switching tube of Buck/Boost reversible transducers
Modulation.Buck/Boost reversible transducers are Double closed-loop of voltage and current, it is therefore an objective to control lithium according to the voltage of super capacitor
The auto charge and discharge of battery, makes the voltage of super capacitor maintain in operating voltage range, and direct-current grid power swing is entered
Row indirect compensation, to reduce lithium battery operating frequency, effectively extends its service life.
The control method of super capacitor is：The working condition for setting super capacitor and double active full-bridge converters judges area
Between, it is designed specifically to：Set DC bus-bar voltageU DCFor its rated voltage, subregion is carried out to it,U LD3<U LD2<U LD1<U DC<U HD1
<U HD2<U HD3For the voltage threshold of double active full-bridge converter work.[U LD3,U LD2) it is LD（Limited Discharge, current limliting
Electric discharge）Interval, [U LD2,U LD1] it is D（Discharge, electric discharge）Interval, (U LD1,U HD1) it is S（Space, it is idle）Interval, [U HD1,U HD2] it is C（Charge, charging）Interval, (U HD2,U HD3] it is LC（Limited Charge, current-limiting charge）It is interval.U HD3WithU LD3
Corresponding busbar voltage extreme value when respectively straight-flow system can keep normally running.U HD2WithU LD2Respectively mixed energy storage system
Charging current and discharge current busbar voltage corresponding when reaching capacity, to ensure the work of mixed energy storage system well,U HD2
WithU LD2± the 5% of dc bus rated voltage should be generally taken within the maximum fluctuation scope that busbar voltage allows.U HD1WithU LD1Respectively mixed energy storage system initiation of charge and electric discharge charge threshold level, to avoid DC bus-bar voltageU dcIt is normal to produce
The frequent movement of double active full-bridge converters, generally takes ± 1% ~ ± the 2% of dc bus rated voltage during the fluctuation of very little.U dcFor
DC bus-bar voltage actual value, as shown in figure 5, the working condition of super capacitor is：
（1）WhenU dcIn LD is interval, DC bus-bar voltage is less than reference value, and super capacitor is operated in current limliting discharge condition, passed through
Double active full-bridge converters, dc bus is given the energy to maximum discharge current；
（2）WhenU dcIn D is interval, DC bus-bar voltage is less than reference value, and super capacitor is operated in discharge condition, had by double
Source full-bridge converter, dc bus is given the energy to the discharge current that phase shifting control is modulated；
（3）WhenU dcIn S is interval, DC bus-bar voltage is stable near reference value, and super capacitor is operated in idle condition, no
Energy exchange is carried out with dc bus；
（4）WhenU dcIn C is interval, DC bus-bar voltage is higher than reference value, and super capacitor is operated in charged state, had by double
Source full-bridge converter, the charging current modulated with phase shifting control absorbs the energy of dc bus；
（5）WhenU dcIn LC is interval, DC bus-bar voltage is higher than reference value, and super capacitor is operated in current-limiting charge state, passed through
Double active full-bridge converters, the energy of dc bus is absorbed with maximum charging current.
The control method of the lithium battery is：The working condition for setting lithium battery and Buck/Boost reversible transducers judges
Interval, is designed specifically to：Set super-capacitor voltageU SCFor its reference voltage, subregion is carried out to it,U LS3<U LS2<U LS1<U SC<U HS1<U HS2<U HS3The voltage threshold worked for Buck/Boost reversible transducers.[U LS3,U LS2) for LD it is interval, [U LS2,U LS1] be
D is interval, (U LS1,U HS1) for S it is interval, [U HS1,U HS2] for C it is interval, (U HS2,U HS3] it is LC interval.U HS3WithU LS3It is respectively super
Corresponding voltage extremity when electric capacity can keep normally running, is generally determined by the self character of super capacitor.Super-capacitor voltage
Reference valueU SCFor the voltage corresponding to its state-of-charge half.U HS2WithU LS2Respectively the current limliting of lithium battery defined is discharged and filled
Magnitude of voltage corresponding to electricity, generally takes voltage set by super-capacitor voltageU SC± 60% ~ ± 80%.U HD1WithU LD1Respectively lithium
Battery initiation of charge and the charge threshold level of electric discharge, the value are combined by the capacity ratio of lithium battery in system and super capacitor and needed
The charging and discharging lithium battery frequency to be set is determined, generally takes voltage set by super-capacitor voltageU SC± 10% ~ ± 50%, it is set
Fixed [U LS1,U HS1] scope is narrower, charging and discharging lithium battery number of times is more frequent.Citing：Super capacitor rated voltage 48V, according to super
Level electric capacity regulation settingU LS3=4V,U HS3=50V,U SC=24V, [U LS1,U HS1] take setting voltageU SC± 50%, thenU LS1=12V,U HS1=When 36V, super capacitor actual value and bigger reference value difference, charging and discharging lithium battery electric current is bigger, configures lithium battery defined
Current limliting electric discharge and the corresponding magnitude of voltage of charging beU SC± 80%, thenU LS2=4.8V,U HS2=43.2V。U scIt is real for super capacitor
Border voltage, the working condition of lithium battery is：
（1）WhenU scIn LD is interval, super-capacitor voltage is less than reference value, and lithium battery is operated in current limliting discharge condition, passed through
Buck/Boost reversible transducers, super capacitor is given the energy to maximum discharge current；
（2）WhenU scIn D is interval, super-capacitor voltage is less than reference value, and lithium battery is operated in discharge condition, passes through Buck/
Boost reversible transducers, super capacitor is given the energy to the discharge current that double-closed-loop control is modulated；
（3）WhenU scIn S is interval, super-capacitor voltage is stable, and lithium battery is operated in idle condition near reference value, not with
Super capacitor carries out energy exchange；
（4）WhenU scIn C is interval, super-capacitor voltage is higher than reference value, and lithium battery is operated in charged state, passes through Buck/
Boost reversible transducers, the charging current modulated with double-closed-loop control absorbs the energy of super capacitor；
（5）WhenU scIn LC is interval, super-capacitor voltage is higher than reference value, and lithium battery is operated in current-limiting charge state, passed through
Buck/Boost reversible transducers, the energy of super capacitor is absorbed with maximum charging current.
A kind of above-mentioned mixed energy storage system based on double active full-bridge converters, lithium battery and Buck/Boost is two-way
Converter is integrated into module I, super capacitor and double active full-bridge converters is integrated into module II, module I is integrated with module II
For energy-storage module, energy-storage module is suitably matched according to the requirement of straight-flow system, then by energy-storage module in dc bus
On according to proportioning carry out parallel configuration.
Claims (3)
1. a kind of mixed energy storage system based on double active full-bridge converters, it is characterised in that：Including super capacitor, lithium battery,
Double active full-bridge converters, Buck/Boost reversible transducers and dc bus；The super capacitor passes through double active full-bridges
Converter is connected with dc bus, and double active full-bridge converters use phase shift closed-loop control；The lithium battery passes through Buck/
Boost reversible transducers are connected with super capacitor, and described Buck/Boost reversible transducers use voltage and current double closed-loop control
System.
2. a kind of mixed energy storage system based on double active full-bridge converters according to claim 1, it is characterised in that：Lithium
Battery and Buck/Boost reversible transducers are integrated into module I, and super capacitor and double active full-bridge converters are integrated into module II,
The module I is integrated into energy-storage module with module II, and the energy-storage module is suitably matched according to the requirement of straight-flow system,
Then energy-storage module is subjected to parallel configuration on dc bus according to proportioning.
3. a kind of control method of mixed energy storage system based on double active full-bridge converters according to claim 1, its
It is characterised by：
The control method of double active full-bridge converters is：Phase shift closed-loop control, that is, set mixed energy storage system and give reference voltageU refWith DC bus-bar voltageU dcVoltage PI regulator is sent into compared to after, voltage PI regulator output valve is obtained after limiter
Go out phase shift dutycycleD 1Value, then phase shift dutycycleD 1PWM waveform by the output of phase-shift PWM generator Jing Guo phase shift is to double
The switching tube of active full-bridge converter carries out phase-shift PWM modulation；
The control method of Buck/Boost reversible transducers is：Double closed-loop of voltage and current, that is, set the given ginseng of super capacitor
Examine voltageU sc_refWith super-capacitor voltageU scVoltage PI regulator is sent into compared to after, voltage PI regulator output valve is by electricity
Show that lithium battery refers to output current after stream limiterI bat_ref, then with lithium battery output currentI batElectric current is sent into compared to after
Pi regulator, electric current pi regulator output valve as Buck/Boost reversible transducers dutyfactor valueD 2, then dutyfactor valueD 2
PWM waveform is exported by PWM generator, and PWM is carried out to the switching tube of Buck/Boost reversible transducers；
The control method of super capacitor is：The working condition for setting super capacitor and double active full-bridge converters judges interval, tool
Body is designed as：Set DC bus-bar voltageU DCFor its rated voltage, subregion is carried out to it,U LD3<U LD2<U LD1<U DC<U HD1<U HD2<U HD3For the voltage threshold of double active full-bridge converter work；[U LD3,U LD2) for LD it is interval, [U LD2,U LD1] for D it is interval, (U LD1,U HD1) for S it is interval, [U HD1,U HD2] for C it is interval, (U HD2,U HD3] it is LC interval；U HD3WithU LD3Respectively straight-flow system can be kept just
Corresponding busbar voltage extreme value when often running；U HD2WithU LD2The charging current and discharge current of respectively mixed energy storage system reach
Corresponding busbar voltage during the limit；U HD1WithU LD1Respectively mixed energy storage system initiation of charge and electric discharge charge threshold level,U dcFor DC bus-bar voltage actual value, the working condition of super capacitor is：
（1）WhenU dcIn LD is interval, DC bus-bar voltage is less than reference value, and super capacitor is operated in current limliting discharge condition, passed through
Double active full-bridge converters, dc bus is given the energy to maximum discharge current；
（2）WhenU dcIn D is interval, DC bus-bar voltage is less than reference value, and super capacitor is operated in discharge condition, by double active
Full-bridge converter, dc bus is given the energy to the discharge current that phase shifting control is modulated；
（3）WhenU dcIn S is interval, DC bus-bar voltage is stable, and super capacitor is operated in idle condition near reference value, not with
Dc bus carries out energy exchange；
（4）WhenU dcIn C is interval, DC bus-bar voltage is higher than reference value, and super capacitor is operated in charged state, by double active
Full-bridge converter, the charging current modulated with phase shifting control absorbs the energy of dc bus；
（5）WhenU dcIn LC is interval, DC bus-bar voltage is higher than reference value, and super capacitor is operated in current-limiting charge state, passed through
Double active full-bridge converters, the energy of dc bus is absorbed with maximum charging current；
The control method of lithium battery is：The working condition for setting lithium battery and Buck/Boost reversible transducers judges interval, tool
Body is designed as：Set super-capacitor voltageU SCFor its reference voltage, subregion is carried out to it,U LS3<U LS2<U LS1<U SC<U HS1<U HS2<U HS3The voltage threshold worked for Buck/Boost reversible transducers；[U LS3,U LS2) for LD it is interval, [U LS2,U LS1] it is D interval,
(U LS1,U HS1) for S it is interval, [U HS1,U HS2] for C it is interval, (U HS2,U HS3] it is LC interval；U HS3WithU LS3Difference position super capacitor energy
Corresponding voltage extremity when keeping normally running；U HS2WithU LS2Respectively the current limliting of super capacitor defined is discharged and charging voltage
Threshold value；U HD1WithU LD1Respectively lithium battery initiation of charge and electric discharge charge threshold level,U scFor super capacitor virtual voltage, lithium electricity
The working condition in pond is：
（1）WhenU scIn LD is interval, super-capacitor voltage is less than reference value, and lithium battery is operated in current limliting discharge condition, passed through
Buck/Boost reversible transducers, super capacitor is given the energy to maximum discharge current；
（2）WhenU scIn D is interval, super-capacitor voltage is less than reference value, and lithium battery is operated in discharge condition, passes through Buck/
Boost reversible transducers, super capacitor is given the energy to the discharge current that double-closed-loop control is modulated；
（3）WhenU scIn S is interval, super-capacitor voltage is stable, and lithium battery is operated in idle condition near reference value, not with surpassing
Level electric capacity carries out energy exchange；
（4）WhenU scIn C is interval, super-capacitor voltage is higher than reference value, and lithium battery is operated in charged state, passes through Buck/
Boost reversible transducers, the charging current modulated with double-closed-loop control absorbs the energy of super capacitor；
（5）WhenU scIn LC is interval, super-capacitor voltage is higher than reference value, and lithium battery is operated in current-limiting charge state, passed through
Buck/Boost reversible transducers, the energy of super capacitor is absorbed with maximum charging current.
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