CN109103873A - A kind of high-capacity direct current energy storage device with direct current DVR - Google Patents
A kind of high-capacity direct current energy storage device with direct current DVR Download PDFInfo
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- CN109103873A CN109103873A CN201811286581.4A CN201811286581A CN109103873A CN 109103873 A CN109103873 A CN 109103873A CN 201811286581 A CN201811286581 A CN 201811286581A CN 109103873 A CN109103873 A CN 109103873A
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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
- H02J1/14—Balancing the load in a network
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention proposes a kind of high-capacity direct current energy storage devices with direct current DVR, belong to power energy storage, DC converting technical field.Described device is using lithium battery or super capacitor as energy-storage units, in such a way that main energy storage mould group and compensation energy storage mould group combine, when DC bus-bar voltage drops to reference value or less, by the effect of direct current DVR, it is the DC voltage for meeting system requirements by the energy stored in compensation energy storage mould group output, to make up the internal resistance of main energy storage mould group, line impedance and the Voltage Drop caused to the release of the energy of load-side, it maintains the stabilization of busbar voltage in reference value, and continues to power to load-side.
Description
Technical field
The present invention relates to a kind of high-capacity direct current energy storage devices with direct current DVR, belong to power energy storage, DC converting skill
Art field.
Background technique
Lithium ion battery generally uses lithium metal oxide, such as sour iron lithium, LiMn2O4, ternary etc., as positive electrode, stone
Ink is used as negative electrode material.Lithium battery is now widely used for waterpower, firepower, the energy-storage systems such as wind energy and solar energy, communication equipment
Uninterruptible power supply, electric tool, electric vehicle, military equipment, many Military and civil fields such as aerospace.It is with following
Advantage: small in size, light-weight, energy density is high, can reach 460 to 600Wh/Kg；Long service life, generally can reach 6 years with
On；Voltage rating is high, monomer voltage 3.2V or 3.7V, is equivalent to 3 nickel-metal hydride battery series connection；Have high-discharge-rate ability,
In ferric phosphate lithium cell discharge-rate for electric vehicle can reach tens of C, can be used for transient high-current charge and discharge occasion；From putting
Electric rate is low, can accomplish to be no more than for 1%/moon；It is environmentally protective, it produces, use and scrapping process do not contain, do not generate lead mercury yet
Equal toxic heavy metal elements and substance.Due to the above advantage, lithium ion battery, which is very suitable for applying, requires high, body in energy density
In the limited power energy storage occasion of product.
And super capacitor, also known as farad capacitor, it is now widely used in electronic mixed dynamic bus, crane, rail traffic
The new energy fields such as energy regenerating, it is obtained super by the double electrical layers formed using active carbon porous electrode and electrolyte
Large capacity.It has the advantage that charging rate is fast, and charging can reach 95% of its rated capacity or more in 10 seconds~10 minutes；
Ring long service life, depth charge and discharge cycles access times do not have " memory effect " up to 1~500,000 times；It is large current discharge energy
Power is superpower, and energy conversion efficiency is high, and process losses are small, high current energy circulation efficiency >=90%；Power density is high, reachable
300W/KG~5000W/KG is equivalent to 5~10 times of battery；It product raw material composition, production, use, storage and disassembled
Cheng Jun does not pollute, and is ideal environmentally protective power supply；Charge and discharge electric line is simple, is not necessarily to charging circuit as rechargeable battery,
Safety coefficient is high, is used for a long time non-maintaining；Ultralow temperature characteristics are good, and temperature range is -40 DEG C wide~and+70 DEG C.Due to the above advantage, surpass
Grade capacitor is well suited for applying in the electrical occasion high to charge-discharge power demand.
Dynamic Voltage Regulator DVR is a kind of utility power quality control device based on custom power technology, utilizes electric power
Electronic technology and modern control theory, to Voltage Drop, harmonic pollution, the power quality problems such as power failure are effectively solved
Certainly, relatively traditional power quality adjusting device, such as synchronous capacitor, static compensator etc. have flexibly, quickly, accurate etc. excellent
Gesture becomes at present the compensation device of the inhibition voltage fluctuation of most future, is connected between route and load, compensation supplies
Voltage disturbance in electric system makes load-side be maintained sinusoidal, balance, the voltage waveform of amplitude stability.But currently, for DVR
Research concentrate on exchanging occasion with using the overwhelming majority, and in direct current occasion, especially high-capacity direct current energy storage occasion, it is difficult to
Find similar document or application example.
As the power supply unit of heavy-duty motor drive system, maintaining the constant of DC bus-bar voltage is to guarantee to click steadily
Operation and the stable important guarantee of system.According to pure battery or purely capacitive energy storage scheme, due to applying in high-voltage great-current
Occasion, then needed for battery or capacitor amount of monomer it is huge, and there are busbar voltages to fall greatly, and operational process is uncontrolled etc. asks
Topic.Currently, generally carrying out bus pressure stabilizing control in such a way that prime installs DC converter additional, but large capacity application makes
The Primary Component in DC converter, such as inductance are obtained, the selection of switching device becomes very difficult, it is difficult to take into account transducer performance
And volume, the contradiction of weight.
For the power energy storage occasion of large capacity, it would be highly desirable to a kind of both to have made required energy-storage units quantity few as far as possible, direct current
Inverter power is small as far as possible, to control its volume, weight and cost, guarantees the power density of whole system, and mother may be implemented
The stably and controllable energy storage scheme of line voltage.
Summary of the invention
The present invention provides a kind of with direct current DVR dynamic to solve above-mentioned the technical problems existing in the prior art
The high-capacity direct current energy storage device of voltage regulator.Using lithium battery or super capacitor as energy-storage units, using main energy storage mould group
The mode combined with compensation energy storage mould group, when DC bus-bar voltage drops to reference value or less, by the work of direct current DVR
With the DC voltage that the energy stored in compensation energy storage mould group output is met system requirements, to make up main energy storage mould group
Internal resistance, line impedance and the Voltage Drop caused to the release of the energy of load-side maintain the stabilization of busbar voltage referring to
Value, and continue to power to load-side.Specific technical solution adopted by the present invention is as follows:
A kind of high-capacity direct current energy storage device with direct current DVR, described device include main energy storage mould group 1, DVR compensator
2, compensation energy storage mould group 3, freewheeling diode 4, filter capacitor 5, energy storage management system 1, energy storage management system 27, charging dress
Set one 8, charging unit 29, control unit 10, DC voltage sampling unit 11, DC current sampling unit 12 and isolation drive
Unit 13；The main energy storage mould group 1 is connected with DVR compensator 2；The DVR compensator 2 is in parallel with freewheeling diode 4；The master
The charging end of energy storage mould group 1 and compensation energy storage mould group 3 is connected with the feeder ear of charging unit 1 and charging unit 29 respectively；Institute
State the operating index control terminal of main energy storage mould group 1 and compensation energy storage mould group 3 respectively with energy storage management system 1 and energy storage management system
Unite 27 monitoring control terminal be connected；The terminal voltage signal end of the main energy storage mould group 1 and 2 output voltage terminal of DVR compensator and straight
The sampling end for flowing voltage sampling unit 11 is connected；The sampled digital signal output end of the DC voltage sampling unit 11 with it is described
The voltage sample digital signal input end of control unit 10 is connected；The output current terminal and the direct current of the DVR compensator 2
The sampling end for flowing sampling unit 12 is connected；The sampled digital signal output end of the DC current sampling unit 12 and the control
The current sample digital signal input end of unit 10 is connected；The signal output end of described control unit 10 and the isolation drive list
The signal input part of member 13 is connected；Switching tube in the signal output end of the isolation drive unit 13 and the DVR compensator 2
It is connected.
Wherein, main energy storage mould group 1, DVR compensator 2, compensation energy storage mould group 3, freewheeling diode 4, filter capacitor 5, energy storage
The master that management system 1, energy storage management system 27, charging unit 1, charging unit 29 constitute DC energy storage device opens up
It flutters；DVR compensator 2 is in parallel with freewheeling diode 4, then connects with main energy storage mould group 1, thus when DVR work when, output electric current with
Bus current is identical, is changed according to load-side demand.Energy storage management system 1 and energy storage management system 27 are respectively to main storage
Energy mould group 1 and compensation energy storage mould group 3 carry out voltage, electric current, the monitoring and Pressure and Control of temperature etc.；Charging unit 1 and charging
Device 29 is for charging to main energy storage mould group 1 and compensation energy storage mould group 3 during energy-storage system interval, to guarantee
Energy needed for operation system next time.11 pairs of DC voltage sampling unit main 1 end voltages of energy storage mould group and DVR compensator 2 export
Voltage is sampled, and output flanks control unit 10, and collected voltage analog is become digital quantity by analog-to-digital conversion,
And it is sent into the processing of control unit 10.Similarly, DC current sampling unit 12 completes the detection and sampling to DVR output electric current, and
It is connected with control unit 10.13 input terminal of isolation drive unit is connected with control unit 10, output and opening in DVR compensator 2
Pipe is closed to be connected.
Further, the main energy storage mould group and compensation energy storage mould group 3 using lithium battery monomer or super capacitor mould group as
Basic energy-storage units；The lithium battery monomer or super capacitor mould group by series and parallel form formed the main energy storage mould group and
Compensation energy storage mould group 3, if energy-storage units are lithium battery, energy storage management system is battery management system, if energy-storage units are super
Grade capacitor, then energy storage management system is super capacitance management system.
Further, the selection process of the lithium battery or the series-parallel quantity of super capacitor mould group are as follows:
Step 1: it is calculated according to main energy storage mould group serial number model and main energy storage modules in parallel quantitative model and obtains main storage
The serial number M1 of energy mould group and number N1 in parallel, the main energy storage mould group serial number model and main energy storage modules in parallel quantitative model
It is as follows respectively:
M1=ceil (Udcmax/Ur_es1) (1)
N1=ceil (Idcmax/Ir_es1) (2)
Wherein, Udcmax is busbar voltage maximum value, and Idcmax is bus current maximum value, UrBased on _ es1, Ir_es1
Battery modules in energy storage mould group, the voltage rating and rated current of monomer or super capacitor mould group, the serial number of main energy storage mould group
For M1, number in parallel is N1, and the serial number of compensation energy storage mould group is M2, and number in parallel is N2, and ceil is the function that rounds up；
Step 2: it is Idcmax*1+0.5*P% that compensation energy storage mould group, which exports current maxima, according to compensation energy storage mould group
Serial number model and main energy storage modules in parallel quantitative model calculate the serial number M2 for obtaining compensation energy storage mould group and number N2 in parallel,
The compensation energy storage mould group serial number model and main energy storage modules in parallel quantitative model difference are as follows:
N2=ceil [Idcmax(1+0.5*P%)/Ir_es2] (3)
M2=ceil [UBuckmax(1+A%)/Ur_es2] (4)
Wherein, Ur_es2, Ir_es2 are battery modules in compensation energy storage mould group, the specified electricity of monomer or super capacitor mould group
Pressure and rated current, P% is inductive current ripple rate, and the value range of P is 10-40；A% exists for compensation energy storage mould group
Pressure drop when Buck works in estimation discharge process, its pressure drop of different energy-storage units difference operating statuses are also different；
Step 3: if the M2 tentatively chosen not enough meets in 0~t2 time, busbar voltage is stablized in reference value Uref, card
Bright serial number M2 is unsatisfactory for requiring, and enables M2=M2+1, searches the serial number for meeting pressure stabilizing requirement upwards, wants until finding satisfaction
Until the M2 asked；If the M2 tentatively chosen makes energy-storage system realize pressure stabilizing, it was demonstrated that serial number M2 is met the requirements, and enables M2=M2-
1, the minimum serial number met the requirements is searched downwards, and until M2 cannot just be met the requirements, then M2+1 at this time is as rigid
The serial number met the requirements well can reach the quantity for reducing required energy storage mould group to the greatest extent, reduces system bulk, reduces cost, mention
The purpose of high power density.
Further, the operating mode of the high-capacity direct current energy storage device with direct current DVR are as follows: the high-capacity direct
When stream energy storage device brings into operation, compensation energy storage mould group 3 and DVR compensator 2 do not work, and are worked independently by main energy storage mould group 1, to
Load provides energy, and freewheeling diode 4 plays afterflow；Then the high-capacity direct current energy storage device carries out enabled link and sentences
Disconnected, when judging result is that busbar voltage drops to the pressure stabilizing value of device, compensation energy storage mould group 3 and DVR compensator 2 are started to work,
Export offset voltage；The compensation energy storage mould group 3 is that DVR compensator 2 provides compensation energy until this runing time is to described
High-capacity direct current energy storage device completes a complete discharge process；The main energy storage mould group 1 and the waiting of compensation energy storage mould group 3 are filled
Electricity, and next task is prepared.
Further, the detailed process of the enabled link judgement are as follows:
As UES1 < Uref, show that busbar voltage starts to drop to Uref hereinafter, then DVR should run simultaneously offset voltage immediately
Fall, enabling link output is 1；Work as UES1 > Uref, show that busbar voltage is still higher than Uref, DVR do not work, and enables link output
It is 0, and in the high-capacity direct current energy storage device operational process, the enabled link real-time judge, until energy storage device one
Secondary complete discharge process terminates.
Further, described control unit 10 exports the control of current inner loop two close cycles using busbar voltage outer shroud and DVR
Mode, the detailed process of the busbar voltage outer shroud and DVR output current inner loop double-closed-loop control are as follows:
With the busbar voltage stationary value U of the high-capacity direct current energy storage devicerefFor outer voltage reference quantity, sampling is obtained
Feedback quantity as outer voltage of main 1 end voltage of energy storage mould group and the sum of 2 output voltage of DVR compensator, in conjunction with enabled link
Judge the judging result obtained, both outer voltage reference quantity and feedback quantity of outer voltage are multiplied and are used as input signal, is sent
The voltage regulator entered in control unit 10 carries out PI adjusting processing, using voltage regulator output as the electricity of current inner loop
Reference quantity is flowed, for the DVR output electric current sampled as current feedback amount, it is poor that both current reference amount and current feedback amount are made
As the input signal of the current regulator in control unit 10, the output result that the current regulator carries out after PU adjusting is
For duty ratio, the PWM drive signal of DVR compensator can be obtained afterwards compared with carrier wave.
The invention has the advantages that:
A kind of high-capacity direct current energy storage device with direct current DVR proposed by the present invention largely reduces basic storage
The quantity of energy unit, while DC converter power is largely reduced, and under same battery capacity, the present invention is mentioned
Middle DC energy storage device reduces the basic energy-storage units quantity of high-capacity direct current energy storage device out compared with the existing technology
50%, DC converter power reduces 80%, thereby reduce high-capacity direct current energy storage device own vol, weight and at
This.Meanwhile the high-capacity direct current energy storage device proposed by the present invention with direct current DVR is the power that ensure that entire energy-storage system
Density, but it is stably and controllable to realize busbar voltage.
Detailed description of the invention
Fig. 1 is the high-capacity direct current energy storage device structure block diagram with direct current DVR.
Fig. 2 is four kinds of main circuit topology figures of the DC energy storage device of embodiment, wherein (a) battery powered holds main circuit
Figure；(b) battery powered pond main circuit diagram；(c) main circuit diagram is held in capacitor power-up；(d) capacitor is powered on pond main circuit diagram.
Fig. 3 is the related DC voltage waveform schematic diagram of embodiment.
Fig. 4 is that the series-parallel quantity of energy storage mould group of embodiment chooses flow chart.
Fig. 5 is the DC energy storage device loop control theory figure of embodiment.
Fig. 6 is the energy storage device operating mode decision flow chart of embodiment.
1, main energy storage mould group；2, DVR compensators；3, compensation energy storage mould group；4, freewheeling diode；5, filter capacitor；6, storage
It can management system one；7, energy storage management system two；8, charging unit one；9, charging unit two；10, control unit；11, direct current
Press sampling unit；12, DC current sampling unit；13, isolation drive unit
Specific embodiment party
The present invention will be further described combined with specific embodiments below, but the present invention should not be limited by the examples.
Embodiment 1:
The present embodiment proposes a kind of high-capacity direct current energy storage device with direct current DVR, as shown in Figure 1, described device packet
Include main energy storage mould group 1, DVR compensator 2, compensation energy storage mould group 3, freewheeling diode 4, filter capacitor 5, energy storage management system 1,
Energy storage management system 27, charging unit 1, charging unit 29, control unit 10, DC voltage sampling unit 11, direct current
Flow sampling unit 12 and isolation drive unit 13；The main energy storage mould group 1 is connected with DVR compensator 2；The DVR compensator 2 with
Freewheeling diode 4 is in parallel；The charging end of the main energy storage mould group 1 and compensation energy storage mould group 3 respectively with charging unit 1 and charging
The feeder ear of device 29 is connected；The operating index control terminal of the main energy storage mould group 1 and compensation energy storage mould group 3 respectively with energy storage
Management system 1 is connected with the monitoring control terminal of energy storage management system 27；The terminal voltage signal end of the main energy storage mould group 1 and
2 output voltage terminal of DVR compensator is connected with the sampling end of DC voltage sampling unit 11；The DC voltage sampling unit 11
Sampled digital signal output end is connected with the voltage sample digital signal input end of described control unit 10；The DVR compensator 2
Output current terminal be connected with the sampling end of the DC current sampling unit 12；The sampling of the DC current sampling unit 12
Digital signal output end is connected with the current sample digital signal input end of described control unit 10；The letter of described control unit 10
Number output end is connected with the signal input part of the isolation drive unit 13；The signal output end of the isolation drive unit 13 with
Switching tube in the DVR compensator 2 is connected.
Wherein, main energy storage mould group 1 using the lithium battery of high-discharge-rate as energy-storage units, and compensation energy storage mould group 3 with
Super capacitor mould group is as energy-storage units, according to wanting for energy-storage system busbar voltage maximum value and bus current maximum value and energy
It asks and series-parallel combination appropriate is carried out to lithium battery monomer or super capacitor mould group, to meet the large capacity application requirement of system.
DVR compensator 2 is in parallel with freewheeling diode 4, then connects with main energy storage mould group 1, therefore when DVR work, output electric current and mother
Line current is identical, is changed according to load-side demand.Energy storage management system 1, energy storage management system 27 are respectively to main energy storage mould
Group 1 and compensation energy storage mould group 3 carry out voltage, electric current, on the one hand the monitoring and Pressure and Control of temperature etc. are convenient for human-computer interaction, separately
On the one hand guarantee the balance of voltage between each energy storage mould group, be conducive to system stabilization and extend the service life of energy-storage units.Charging unit
1 and charging unit 29 be used for energy-storage system operation tempus intercalare main energy storage mould group 1 and compensation energy storage mould group 3 are filled
Electricity, to guarantee the required energy of operation system next time.11 pairs of DC voltage sampling unit main 1 end voltages of energy storage mould group and DVR are mended
It repays 2 output voltage of device to be sampled, output flanks control unit 10, and collected voltage analog is become by analog-to-digital conversion
For digital quantity, and it is sent into the processing of control unit 10.Similarly, DC current sampling unit 12 completes the detection to DVR output electric current
And sampling, and be connected with control unit 10.External interference can be effectively suppressed in isolated drive circuit 14, guarantees the complete of driving pulse
Accurately, input terminal is connected with control unit 10, and output is connected with the switching tube in DVR compensator 2.
Embodiment 2
The present embodiment proposes a kind of high-capacity direct current energy storage device with direct current DVR, and described device includes main energy storage mould
Group 1, DVR compensator 2, compensation energy storage mould group 3, freewheeling diode 4, filter capacitor 5, energy storage management system 1, energy storage management system
It unites 27, charging unit 1, charging unit 29, control unit 10, DC voltage sampling unit 11, DC current sampling unit
12 and isolation drive unit 13.The DVR compensator 2 is realized using dcdc converter, including Buck, Boost, Buck-
The common forms such as Boost, there are four types of shapes altogether for the main circuit of the high-capacity direct current energy storage device in the present embodiment with direct current DVR
Formula, as shown in Figure 2.
Buck electric routing switch pipe, freewheeling diode, filter inductance, the part such as filter capacitor form.Common derailing switch
Part has IGBT and power MOSFET, although MOSFET conduction voltage drop is lower, switching frequency is higher, its pressure resistance and load current value
It is lower, it is unable to satisfy the application requirement of large-capacity power energy storage occasion, therefore switching device selects IGBT in this example.Energy storage for power supply
The relative voltage waveforms of system are illustrated to ignore the conduction voltage drop of sustained diode 1, bus as shown in figure 3, within 0~t1 time
Voltage is equal to the end voltage of main energy storage mould group, and with the progress of high power discharge, busbar voltage declines rapidly, until the t1 moment reduces
To the pressure stabilizing value U of requirement of system designreF, compensation energy storage mould group starts to release energy at this time, cuts by the decompression of Buck circuit
Wave exports DC voltage UDVR, to make up main energy storage mould group because of itself internal resistance, line impedance and release energy to load and
Caused pressure drop, and busbar voltage dynamic is made to maintain Uref, until the t2 moment terminates, complete energy storage device and once completely put
Electric process.In t1~t2 time, busbar voltage is equal to the sum of main energy storage mould group end voltage and Buck output voltage UDVR, diode
D1 ends due to bearing back-pressure, then Buck output is connected with main energy storage mould group, so Buck exports electric current, i.e. inductive current,
Identical as bus current, phase variation tendency is by load-side factors influencing demand.Buck circuit during the work time, input voltage, i.e.,
The end voltage of compensation energy storage mould group is due to constantly decline of discharging, until the t2 moment is near minimum, but due to the topological constraints of Buck, still
Not less than U at this timeBuck.And Buck input current is since the HF switch of switch transistor T acts, and is in copped wave form, in switching tube
During opening, the electric discharge of compensation energy storage mould group, Buck input current is identical as output electric current, and inductance is in charging process, inductance electricity
During stream is gradually increasing, and switching tube turns off, compensation energy storage mould group open circuit, filter inductance electric discharge is together with filter capacitor to output
Side electric discharge, by diode D2 afterflow, inductive current is gradually reduced.Thus, output electric current and the inductance electricity of compensation energy storage mould group
Peak value having the same is flowed, if inductive current ripple rate is P%, bus current maximum value is Idcmax, then compensation energy storage mould group
Output current peak is Idcmax*1+0.5*P%.
Embodiment 3
The present embodiment proposes a kind of high-capacity direct current energy storage device with direct current DVR, and described device includes main energy storage mould
Group 1, DVR compensator 2, compensation energy storage mould group 3, freewheeling diode 4, filter capacitor 5, energy storage management system 1, energy storage management system
It unites 27, charging unit 1, charging unit 29, control unit 10, DC voltage sampling unit 11, DC current sampling unit
12 and isolation drive unit 13.The main energy storage mould group and compensation energy storage mould group 3 are made with lithium battery monomer or super capacitor mould group
For basic energy-storage units；The lithium battery monomer or super capacitor mould group form the main energy storage mould group by series and parallel form
With compensation energy storage mould group 3, if energy-storage units are lithium battery, energy storage management system is battery management system, if energy-storage units are
Super capacitor, then energy storage management system is super capacitance management system.
The selection process of the lithium battery or the series-parallel quantity of super capacitor mould group are as follows:
Step 1: it is calculated according to main energy storage mould group serial number model and main energy storage modules in parallel quantitative model and obtains main storage
The serial number M1 of energy mould group and number N1 in parallel, the main energy storage mould group serial number model and main energy storage modules in parallel quantitative model
It is as follows respectively:
M1=ceil (Udcmax/Ur_es1) (1)
N1=ceil (Idcmax/Ir_es1) (2)
Wherein, Udcmax is busbar voltage maximum value, and Idcmax is bus current maximum value, based on Ur_es1, Ir_es1
Battery modules in energy storage mould group, the voltage rating and rated current of monomer or super capacitor mould group, the serial number of main energy storage mould group
For M1, number in parallel is N1, and the serial number of compensation energy storage mould group is M2, and number in parallel is N2, and ceil is the function that rounds up；
Step 2: it is Idcmax*1+0.5*P% that compensation energy storage mould group, which exports current maxima, according to compensation energy storage mould group
Serial number model and main energy storage modules in parallel quantitative model calculate the serial number M2 for obtaining compensation energy storage mould group and number N2 in parallel,
The compensation energy storage mould group serial number model and main energy storage modules in parallel quantitative model difference are as follows:
N2=ceil [Idcmax(1+0.5*P%)/Ir_es2] (3)
M2=ceil [UBuckmax(1+A%)/Ur_es2] (4)
Wherein, Ur_es2, Ir_es2 are battery modules in compensation energy storage mould group, the specified electricity of monomer or super capacitor mould group
Pressure and rated current, P% is inductive current ripple rate, and the value range of P is 10-40；A% exists for compensation energy storage mould group
Pressure drop when Buck works in estimation discharge process, its pressure drop of different energy-storage units difference operating statuses are also different；
Step 3: if the M2 tentatively chosen not enough meets in 0~t2 time, busbar voltage is stablized in reference value Uref, card
Bright serial number M2 is unsatisfactory for requiring, and enables M2=M2+1, searches the serial number for meeting pressure stabilizing requirement upwards, wants until finding satisfaction
Until the M2 asked；If the M2 tentatively chosen makes energy-storage system realize pressure stabilizing, it was demonstrated that serial number M2 is met the requirements, and enables M2=M2-
1, the minimum serial number met the requirements is searched downwards, and until M2 cannot just be met the requirements, then M2+1 at this time is as rigid
The serial number met the requirements well can reach the quantity for reducing required energy storage mould group to the greatest extent, reduces system bulk, reduces cost, mention
The purpose of high power density.
So far the serial number M1 of main energy storage mould group, the serial number M2 of number N1 and compensation energy storage mould group in parallel, number in parallel are completed
The selection of N2.
Embodiment 4
The present embodiment proposes a kind of high-capacity direct current energy storage device with direct current DVR, and described device includes main energy storage mould
Group 1, DVR compensator 2, compensation energy storage mould group 3, freewheeling diode 4, filter capacitor 5, energy storage management system 1, energy storage management system
It unites 27, charging unit 1, charging unit 29, control unit 10, DC voltage sampling unit 11, DC current sampling unit
12 and isolation drive unit 13.Described control unit 10 exports the control of current inner loop two close cycles using busbar voltage outer shroud and DVR
Mode processed, wherein outer voltage, current inner loop respectively with busbar voltage, apply in embodiment as control amount by inductive current
Loop control theory as shown in figure 5, for being the main circuit of battery modules using main energy storage and compensation energy storage, excess-three kind
Topology is similarly.Specifically, by main energy storage mould group end voltage, DVR compensator output voltage passes through DC voltage sample circuit respectively
And low-pass filtering treatment, the high-frequency harmonic in voltage signal is filtered out, UES1, UDVR are obtained, inductive current is adopted by DC current
Sample circuit and low-pass filtering treatment filter out the high-frequency harmonic in current signal, obtain IL, wherein filtering processing includes hardware circuit
Analog filtering and software program in digital filtering, software and hardware filtering uses in this example.Then by UES1, UDVR and
IL is sent into controller and is handled.
UES1 first enables link by DVR and determines which kind of work energy storage device is in determine whether DVR devotes oneself to work
Under operation mode, judge that process is as shown in Figure 6.As UES1 < Uref, show that busbar voltage starts to drop to Uref hereinafter, then DVR is answered
Simultaneously offset voltage is fallen for operation immediately, and enabling link output is 1；Work as UES1 > Uref, shows that busbar voltage is still higher than Uref, DVR
It does not work, enabling link output is 0.Enabled link needs real-time judge, until complete discharge process of energy storage device terminates.This
Voltage in example, current regulator realize that ratio portion P realizes feedback quantity to the quick of reference quantity using proportion integral control device
Tracking, integral part I guarantee feedback and reference quantity floating when stable state.Desired reference amount using Uref as outer voltage,
The actual feedback amount of the sum of UES1 and UDVR as busbar voltage after the two makees difference, is multiplied with enabled link output result, as
Input signal is sent into the processing of voltage PI regulator, and adjuster has amplitude limit link, and output bound is respectively inductive current
Maximum value and minimum value, i.e. Idcmax and 0.Using the output of voltage regulator as the reference quantity of current inner loop, sampling is obtained
Feedback quantity of the IL as current inner loop, after the two makees difference, be sent into the processing of electric current pi regulator, export as duty cycle signals, adjust
It saving device and has amplitude limit link, bound is respectively the maximum value and minimum value of duty ratio, i.e., and 1 and 0.Current regulator output
Duty ratio obtains pwm signal compared with triangular carrier, acts by isolated drive circuit driving switch pipe, realizes to Buck circuit
And the control of entire energy storage device.More than, complete the closed-loop control of the high-capacity direct current energy storage device with direct current DVR.
Although the present invention has been disclosed in the preferred embodiment as above, it is not intended to limit the invention, any to be familiar with this
The people of technology can do various changes and modification, therefore protection of the invention without departing from the spirit and scope of the present invention
Range should subject to the definition of the claims.
Claims (6)
1. a kind of high-capacity direct current energy storage device with direct current DVR, which is characterized in that described device includes main energy storage mould group
(1), DVR compensator (2), compensation energy storage mould group (3), freewheeling diode (4), filter capacitor (5), energy storage management system one (6),
Energy storage management system two (7), charging unit one (8), charging unit two (9), control unit (10), DC voltage sampling unit
(11), DC current sampling unit (12) and isolation drive unit (13)；The main energy storage mould group (1) and DVR compensator (2) are gone here and there
Connection；The DVR compensator (2) is in parallel with freewheeling diode (4)；The main energy storage mould group (1) and compensation energy storage mould group (3) are filled
Electric end is connected with the feeder ear of charging unit one (8) and charging unit two (9) respectively；The main energy storage mould group (1) and compensation storage
The operating index control terminal of energy mould group (3) is controlled with the monitoring of energy storage management system one (6) and energy storage management system two (7) respectively
End is connected；The terminal voltage signal end of the main energy storage mould group (1) and DVR compensator (2) output voltage terminal and DC voltage sample
The sampling end of unit (11) is connected；The sampled digital signal output end of the DC voltage sampling unit (11) and the control are single
The voltage sample digital signal input end of first (10) is connected；The output current terminal and the DC current of the DVR compensator (2)
The sampling end of sampling unit (12) is connected；The sampled digital signal output end of the DC current sampling unit (12) and the control
The current sample digital signal input end of unit (10) processed is connected；The signal output end of described control unit (10) is isolated with described
The signal input part of driving unit (13) is connected；The signal output end and the DVR compensator of the isolation drive unit (13)
(2) switching tube in is connected.
2. according to claim 1 with the high-capacity direct current energy storage device of direct current DVR, which is characterized in that the main energy storage
Mould group and compensation energy storage mould group (3) are using lithium battery monomer or super capacitor mould group as basic energy-storage units；The lithium battery list
Body or super capacitor mould group form the main energy storage mould group and compensation energy storage mould group (3) by series and parallel form.
3. according to claim 2 with the high-capacity direct current energy storage device of direct current DVR, which is characterized in that the lithium battery
Or the selection process of the series-parallel quantity of super capacitor mould group are as follows:
Step 1: it is calculated according to main energy storage mould group serial number model and main energy storage modules in parallel quantitative model and obtains main energy storage mould
The serial number M1 of group and number N1 in parallel, the main energy storage mould group serial number model and main energy storage modules in parallel quantitative model difference
It is as follows:
M1=ceil (Udcmax/Ur_es1) (1)
N1=ceil (Idcmax/Ir_es1) (2)
Wherein, Udcmax is busbar voltage maximum value, and Idcmax is bus current maximum value, and Ur_es1, Ir_es1 are main energy storage
Battery modules in mould group, the voltage rating and rated current of monomer or super capacitor mould group, the serial number of main energy storage mould group are M1,
Number in parallel is N1, and the serial number of compensation energy storage mould group is M2, and number in parallel is N2, and ceil () is the function that rounds up；
Step 2: it is Idcmax* (1+0.5*P%) that compensation energy storage mould group, which exports current maxima, according to compensation energy storage mould group string
Join quantitative model and main energy storage modules in parallel quantitative model calculates the serial number M2 for obtaining compensation energy storage mould group and number N2 in parallel, institute
It states compensation energy storage mould group serial number model and main energy storage modules in parallel quantitative model difference is as follows:
N2=ceil [Idcmax(1+0.5*P%)/Ir_es2] (3)
M2=ceil [UBuckmax(1+A%)/Ur_es2] (4)
Wherein, Ur_es2, Ir_es2 are battery modules in compensation energy storage mould group, the voltage rating of monomer or super capacitor mould group and
Rated current, P% is inductive current ripple rate, and the value range of P is 10-40；A% is for compensation energy storage mould group in Buck
Estimate that the pressure drop in discharge process, its pressure drop of different energy-storage units difference operating statuses are also different when work；
Step 3: if the M2 tentatively chosen not enough meets in 0~t2 time, busbar voltage is stablized in reference value Uref, it was demonstrated that should
Serial number M2 is unsatisfactory for requiring, and enables M2=M2+1, search meet the serial number of pressure stabilizing requirement upwards, meets the requirements until finding
Until M2；If the M2 tentatively chosen makes energy-storage system realize pressure stabilizing, it was demonstrated that serial number M2 is met the requirements, and enables M2=M2-1, to
Lower to search the minimum serial number met the requirements, until M2 cannot just be met the requirements, then (M2+1) at this time is just
The serial number met the requirements.
4. according to claim 1 with the high-capacity direct current energy storage device of direct current DVR, which is characterized in that described to have directly
Flow the operating mode of the high-capacity direct current energy storage device of DVR are as follows: when the high-capacity direct current energy storage device brings into operation, compensation storage
Energy mould group (3) and DVR compensator (2) do not work, and are worked independently by main energy storage mould group (1), provide energy, two pole of afterflow to load
Pipe (4) plays afterflow；Then the high-capacity direct current energy storage device carries out enabled link judgement, and judging result is busbar voltage
When dropping to the pressure stabilizing value of device, compensation energy storage mould group (3) and DVR compensator (2) are started to work, and export offset voltage；It is described
Compensation energy storage mould group (3) is that DVR compensator (2) provide compensation energy up to this runing time to the high-capacity direct current energy storage
Device completes a complete discharge process；The main energy storage mould group (1) and compensation energy storage mould group (3) etc. are to be charged, and next time
Work is prepared.
5. according to claim 4 with the high-capacity direct current energy storage device of direct current DVR, which is characterized in that the enabled ring
Save the detailed process of judgement are as follows:
As UES1 < Uref, show that busbar voltage starts to drop to Uref hereinafter, then DVR should be run immediately and offset voltage is fallen,
Enabled link output is 1；Working as UES1 > Uref, shows that busbar voltage is still higher than Uref, DVR does not work, and enabling link output is 0,
And in the high-capacity direct current energy storage device operational process, the enabled link real-time judge, until energy storage device is once complete
Whole discharge process terminates.
6. according to claim 1 with the high-capacity direct current energy storage device of direct current DVR, which is characterized in that the control is single
First (10) export the control mode of current inner loop two close cycles, the busbar voltage outer shroud and DVR using busbar voltage outer shroud and DVR
Export the detailed process of current inner loop double-closed-loop control are as follows:
Using the busbar voltage stationary value Uref of the high-capacity direct current energy storage device as outer voltage reference quantity, the master sampled
Energy storage mould group (1) holds the feedback quantity of the sum of voltage and DVR compensator (2) output voltage as outer voltage, in conjunction with enabled link
Judge the judging result obtained, both outer voltage reference quantity and feedback quantity of outer voltage are multiplied and are used as input signal, is sent
The voltage regulator entered in control unit (10) carries out PI adjusting processing, using voltage regulator output as current inner loop
Current reference amount, the DVR output electric current sampled make both current reference amount and current feedback amount as current feedback amount
Input signal of the difference as the current regulator in control unit (10), the current regulator carry out the output knot after PU adjusting
Fruit is duty ratio, and the PWM drive signal of DVR compensator can be obtained afterwards compared with carrier wave.
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| CN113346746A (en) * | 2021-06-09 | 2021-09-03 | 易事特集团(河南)有限公司 | Low-cost high-dynamic direct current voltage control method, device and storage medium |
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| CN110649690A (en) * | 2018-06-26 | 2020-01-03 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | DC DVR high-capacity super capacitor lithium battery hybrid energy storage system |
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