CN106374828A - Photovoltaic energy storage inverter, cell current control method and device - Google Patents
Photovoltaic energy storage inverter, cell current control method and device Download PDFInfo
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- CN106374828A CN106374828A CN201510437903.0A CN201510437903A CN106374828A CN 106374828 A CN106374828 A CN 106374828A CN 201510437903 A CN201510437903 A CN 201510437903A CN 106374828 A CN106374828 A CN 106374828A
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention discloses a photovoltaic energy storage inverter, a cell current control method and a device. The photovoltaic energy storage inverter comprises a DC/DC conversion unit, a DC bus, a cell and an inverter output unit, wherein the DC/DC conversion unit converts electric energy generated by a photovoltaic polar plate and then outputs the converted electric energy to the DC bus; the input end of the inverter output unit is connected with the DC bus and the output end provides power externally; and the cell is directly connected with the DC bus. The cell current control method comprises steps: the current of the cell is detected, the current of the cell is controlled through controlling the current outputted by the DC/DC conversion unit to the DC bus, and the current of the cell is thus kept to be direct current.
Description
Technical field
The invention is related to photovoltaic DC-to-AC converter and its control technology field and in particular to a kind of photovoltaic energy storage
Inverter and its battery current control method, the method by setting up functional module construction, by computer journey
Sequence instructs control computer system to complete, and these computer program instructions are stored in computer-readable storage
In medium.
Background technology
Photovoltaic energy storage inverter generally comprises dc/dc converter unit, dc bus, battery and inversion output
Unit, the electric energy that photovoltaic polar plate produces is entered to export after line translation to dc bus by dc/dc converter unit,
Battery is charged or is discharged to dc bus from dc bus power taking, and inversion output unit input connects
Dc bus, outfan is outwards powered.
The outfan of inversion output unit typically connects electrical network and/or load, and inversion output unit does not export
When, when that is, photovoltaic energy storage inverter is unloaded, the electric energy that photovoltaic polar plate produces is carried out through dc/dc converter unit
All it is used for after conversion charging, be substantially now unidirectional current in dc bus, without harmonic wave, inversion exports
When unit has output, harmonic wave in dc bus, may be produced, the electric current in dc bus may contain
There is AC compounent, thus, if battery is directly connected to dc bus, when battery charges or is standby, can
Can lead to battery continually discharge and recharge, this situation is particularly evident when battery is in floating charge state.Frequently
The discharge and recharge of numerous ground can make under battery accelerated warming hot soak condition, so can damage making of battery
With the life-span, also there is potential safety hazard, when serious, battery can spontaneous combustion or blast.Therefore, current photovoltaic storage
In energy inverter, battery generally will be indirectly connected with dc bus by some circuit modules, to eliminate direct current
Harmonic wave in bus, however, increasing circuit module also can increase cost, and can allow integrated circuit become multiple
Miscellaneous.
Content of the invention
One of purpose of the invention is to provide a kind of photovoltaic energy storage inverter battery current control method,
It can charge in battery or allow battery current protect when standby in the case that battery is directly connected to dc bus
Hold direct current, thus avoiding battery continually discharge and recharge.
The two of the purpose of the invention are to provide a kind of photovoltaic energy storage inverter, and its battery is directly connected to directly
Stream bus is also avoided that battery continually discharge and recharge when charging or being standby.
For achieving the above object, the invention provides technical scheme below.
Photovoltaic energy storage inverter battery current control method, described photovoltaic energy storage inverter includes dc/dc and becomes
Change unit, dc bus, battery and inversion output unit, photovoltaic polar plate is produced by dc/dc converter unit
Electric energy enter line translation after export to dc bus, battery is charged from dc bus power taking or is discharged to
Dc bus, inversion output unit input connects dc bus, and outfan is outwards powered, this method bag
Include following steps:
A. detect battery current ibat；
B. according to battery current ibatGenerate the control signal for controlling dc/dc converter unit, to control
Electric current that dc/dc converter unit exports to dc bus is so that battery current ibatKeep direct current.
In addition technical scheme 1.
Photovoltaic energy storage inverter battery current control method according to technical scheme 1, step b includes:
B1. according to battery current ibatDraw battery current ibatHarmonic current ix；
B2. according to harmonic current ixGenerate the control signal for controlling dc/dc converter unit, to control
The electric current that dc/dc converter unit exports to dc bus carrys out harmonic carcellation electric current ix.
This is technical scheme 2.
Photovoltaic energy storage inverter battery current control method according to technical scheme 2, also includes as follows
Step:
C. the power frequency f of detection inversion output unit outputigWith electric voltage frequency fvg；
Step b2 is particularly as follows: according to power frequency fig, electric voltage frequency fvgHarmonic electric current ixGenerate described
Control signal.
This is technical scheme 3.
Photovoltaic energy storage inverter battery current control method according to technical scheme 3, step b2 includes:
Step b21. makes
F=[fvg+(fvg-fig)*ξ]*2 (1)
ki=2 π f/fs(2)
Wherein, ξ is default penalty coefficient, fsFor the sample frequency of described photovoltaic energy storage inverter, by formula
And formula (2) draws k (1)i；
Step b22. is by harmonic current ixInput adjustment factor is kiPr actuator, according to this pr adjust
The output of section device generates described control signal.
This is technical scheme 4.
Photovoltaic energy storage inverter battery current control method according to technical scheme 2, in step b1,
Harmonic current ixFor battery current ibatWith its virtual value ibatDifference.
This is technical scheme 5.
Photovoltaic energy storage inverter battery current control method according to technical scheme 1, dc/dc converts
Unit is buck circuit or boost circuit.
This is technical scheme 6.
Photovoltaic energy storage inverter, exports single including dc/dc converter unit, dc bus, battery and inversion
Unit, the electric energy that photovoltaic polar plate produces is entered to export after line translation to dc bus by dc/dc converter unit, inverse
Become output unit input and connect dc bus, outfan is outwards powered, and battery is directly connected to dc bus,
This photovoltaic energy storage inverter is using the battery current control method as described in any one of claim 1-6.This is
Technical scheme 7.
The beneficial effect of the invention is: when battery charges or is standby, the electricity that is, photovoltaic polar plate produces
When can be sufficient, due to be now dc/dc converter unit to DC bus powered, by detection electricity
Pond electric current simultaneously generates control signal according to battery current, controls dc/dc converter unit by this control signal,
Dc/dc converter unit can be changed according to battery current to the electric current that dc bus exports, that is, pass through control
The harmonic wave that the electric current that dc/dc converter unit processed exports to dc bus to eliminate in dc bus, thus allow
Harmonic wave is not contained in the electric current that dc bus exports to battery, so, even if battery is directly connected to dc bus,
Battery current also can keep direct current.Improvement only by control method is so that it may allow battery to be directly connected to directly
Stream bus, and extra circuit module need not be set up to allow battery be indirectly connected with dc bus, both saved
Cost, also simplify the circuit structure of photovoltaic energy storage inverter.
Brief description
Fig. 1 is the circuit diagram of the photovoltaic energy storage inverter of the invention.
Fig. 2 is the control block diagram of the photovoltaic energy storage inverter battery current control method of the invention.
Reference includes: photovoltaic polar plate 1, dc/dc converter unit 2, inversion output unit 3, relay
Device group 4, electrical network 5, load 6.
Specific embodiment
Below in conjunction with specific embodiment, the invention is elaborated.
As shown in figure 1, the photovoltaic energy storage inverter of the invention includes dc/dc converter unit 2, straight
Stream bus, inversion output unit 3 and relay group 4, dc bus includes positive direct-current bus a and negative direct current
Bus b, dc/dc converter unit 2 is buck circuit, in other embodiments, as needed, dc/dc
Converter unit 2 is alternatively boost circuit.Dc/dc converter unit 2 input connects photovoltaic polar plate 1,
Outfan then connects positive direct-current bus a and negative dc bus b respectively, and inversion output unit 3 input is respectively
Connect positive direct-current bus a and negative dc bus b, outfan then connects relay group 4, via relay group
Electric energy is exported electrical network 5 or load 6 by 4.Inversion output unit 3 includes one by tetra- switches of s1-s4
The inverter of pipe composition, transformator t1 and the electric capacity c4 playing voltage regulation filtering effect in outfan.Photovoltaic pole
The electric energy that plate 1 produces is input to dc/dc converter unit 2, and dc/dc converter unit 2 enters line translation to it
After export to dc bus, inversion output unit 3 power taking from dc bus, carry out inversion and voltage and become
Export after changing to electrical network 5 or load 6.The photovoltaic energy storage inverter of the invention also includes battery bat,
Battery bat is directly connected to dc bus, by using following control method, battery bat charging or
It is also not in the situation of frequent discharge and recharge when standby.
The photovoltaic energy storage inverter of the invention also includes controller, and controller passes through to switching tube
Q1-q2, s1-s4 send control signal to control their on off state, control photovoltaic energy storage inversion with this
The modules collaborative work of device.The method producing the control signal of switching tube s1-s4 is prior art,
This repeats no more.When the electric energy that photovoltaic polar plate 1 produces is sufficient, (battery is now in charging or treating
Machine state), the voltage x current in dc bus is controlled by dc/dc converter unit 2, and battery bat is straight
Connect dc bus in succession, therefore pass through the control controlling dc/dc converter unit 2 to can achieve to battery current
System.Control to dc/dc converter unit 2 is embodied in the control of switch tube q1-q2.
The photovoltaic energy storage inverter battery current control method of the invention is:
Detection photovoltaic polar plate 1 exports the voltage v of dc/dc converter unit 2pvWith electric current ipv, Yi Ji electricity
Hold the voltage v of c1c1Voltage v with electric capacity c2c2, according to voltage vpv, electric current ipvWith voltage vc1
Draw set-point iref+, according to voltage vpv, electric current ipvWith voltage vc2Draw set-point iref-.iref+And iref-
It is the set-point of the electric current of inductance l1, difference is iref+It is in the control signal producing switching tube q1
Calculating process draw, iref-It is to draw in the calculating process of control signal producing switching tube q2,
Draw set-point iref+And iref-Method be prior art, be not described here in detail；
Detection battery current ibat, calculate battery current i accordinglybatVirtual value ibat, it is poor that both make
Go out harmonic current ix.The power frequency f of detection inversion output unit 3 outputigWith electric voltage frequency fvg, order
F=[fvg+(fvg-fig)*ξ]*2 (1)
ki=2 π f/fs(2)
Wherein, ξ is default penalty coefficient, and ξ is adjustable, in the range from -0.1～-1, according to actual electricity
Setting, the stability of line voltage can affect the size of penalty coefficient to pond charging current flow effect, when
During the stabilization of power grids, load current disturbance not electrical network, when grid stability difference, load current can affect
Mains frequency.fsSample frequency for described photovoltaic energy storage inverter.Drawn by formula (1) and formula (2)
ki, by harmonic current ixInput adjustment factor is kiPr actuator, the output of pr actuator is then to adjust
Section amount it, by itRespectively with iref+And iref-It is added, draw desired value il1+And il1-.F exports single according to inversion
The power frequency f of unit 3 outputigWith electric voltage frequency fvgTry to achieve, because the harmonic wave in dc bus is due to inverse
Becoming output unit 3 has output just to produce, and power frequency figWith electric voltage frequency fvgIt is real-time change,
The frequency of harmonic wave is also real-time change therewith, therefore kiIt is also real-time change, this measure can allow desired value il1+
And il1-The frequency of real-time tracking harmonic wave, improves precision；
Electric current i in detection dc busm, by its respectively with desired value il1+And il1-Differ from, then by they
Difference input two pi actuators respectively, output d+ and d- of this two pi actuators is separately input to
Pwm maker, thus respectively obtain the control signal for controlling switch pipe q1 and q2.By described
Control signal controlling switch pipe q1 and q2, the final electric current controlling inductance l1, namely dc/dc conversion
The electric current that unit 2 exports to dc bus, is i in harmonic currentxTiming, dc/dc converter unit 2 to
The electric current of dc bus output correspondingly reduces, and is i in harmonic currentxWhen negative, dc/dc converter unit 2
Electric current to dc bus output correspondingly increases, thus harmonic carcellation electric current, allows battery current ibatKeep
Direct current.
After above-mentioned control method, harmonic current is eliminated, therefore battery bat is directly connected to dc bus
Afterwards, charge or standby when be also not in continually discharge and recharge situation.
Method given herein, all or part of step therein can by setting up functional module construction,
To be completed by computer program instructions control computer system.These computer program instructions are stored in calculating
In machine readable storage medium storing program for executing.
Finally it should be noted that above example is only in order to illustrate the technical scheme of the invention, and
The non-restriction to the invention protection domain, although made to the invention with reference to preferred embodiment in detail
Carefully illustrate, it will be understood by those within the art that, can be to the technical scheme of the invention
Modify or equivalent, without deviating from the spirit and scope of the invention technical scheme.
Claims (13)
1. photovoltaic energy storage inverter battery current control method, described photovoltaic energy storage inverter includes dc/dc conversion
Unit, dc bus, battery and inversion output unit, photovoltaic polar plate is produced by dc/dc converter unit
Electric energy enter line translation after export to dc bus, battery is charged from dc bus power taking or discharges
To dc bus, inversion output unit input connects dc bus, and outfan is outwards powered, and it is special
Levy and be, this method comprises the steps:
A. detect battery current ibat；
B. according to battery current ibatGenerate the control signal for controlling dc/dc converter unit, to control
Electric current that dc/dc converter unit exports to dc bus is so that battery current ibatKeep direct current.
2. photovoltaic energy storage inverter battery current control method according to claim 1 it is characterised in that
Step b includes:
B1. according to battery current ibatDraw battery current ibatHarmonic current ix；
B2. according to harmonic current ixGenerate the control signal for controlling dc/dc converter unit, to control
The electric current that dc/dc converter unit exports to dc bus carrys out harmonic carcellation electric current ix.
3. photovoltaic energy storage inverter battery current control method according to claim 2 it is characterised in that
Also comprise the steps:
C. the power frequency f of detection inversion output unit outputigWith electric voltage frequency fvg；
Step b2 is particularly as follows: according to power frequency fig, electric voltage frequency fvgHarmonic electric current ixGenerate described control
Signal processed.
4. photovoltaic energy storage inverter battery current control method according to claim 3 it is characterised in that
Step b2 includes:
Step b21. makes
f=[fvg+(fvg-fig)*ξ]*2 (1)
ki=2πf/fs(2)
Wherein, ξ is default penalty coefficient, fsFor the sample frequency of described photovoltaic energy storage inverter, by formula (1)
Draw k with formula (2)i；
Step b22. is by harmonic current ixInput adjustment factor is kiPr actuator, according to this pr adjust
The output of device generates described control signal.
5. photovoltaic energy storage inverter battery current control method according to claim 2 it is characterised in that
In step b1, harmonic current ixFor battery current ibatWith its virtual value ibatDifference.
6. photovoltaic energy storage inverter battery current control method according to claim 1 it is characterised in that
Dc/dc converter unit is buck circuit or boost circuit.
7. photovoltaic energy storage inverter, including dc/dc converter unit, dc bus, battery and inversion output unit,
The electric energy that photovoltaic polar plate produces is entered to export after line translation to dc bus, inversion by dc/dc converter unit
Output unit input connects dc bus, and outfan is outwards powered it is characterised in that battery is direct
Connect dc bus, this photovoltaic energy storage inverter is using the battery as described in any one of claim 1-6
Current control method.
8. photovoltaic energy storage inverter battery current control device, described photovoltaic energy storage inverter includes dc/dc conversion
Unit, dc bus, battery and inversion output unit, photovoltaic polar plate is produced by dc/dc converter unit
Electric energy enter line translation after export to dc bus, battery is charged from dc bus power taking or discharges
To dc bus, inversion output unit input connects dc bus, and outfan is outwards powered, and it is special
Levy and be, this device includes following device:
Device a. detects battery current ibat；
Device b. is according to battery current ibatGenerate the control signal for controlling dc/dc converter unit, to control
Electric current that dc/dc converter unit processed exports to dc bus is so that battery current ibatKeep direct current.
9. photovoltaic energy storage inverter battery current control device according to claim 8 it is characterised in that
Device b includes:
Device b1. is according to battery current ibatDraw battery current ibatHarmonic current ix；
Device b2. is according to harmonic current ixGenerate the control signal for controlling dc/dc converter unit, to control
The electric current that dc/dc converter unit processed exports to dc bus carrys out harmonic carcellation electric current ix.
10. photovoltaic energy storage inverter battery current control device according to claim 9 it is characterised in that
Also include following device:
Device c. detects the power frequency f of inversion output unit outputigWith electric voltage frequency fvg；
Device b2 is particularly as follows: according to power frequency fig, electric voltage frequency fvgHarmonic electric current ixGenerate described control
Signal processed.
11. photovoltaic energy storage inverter battery current control devices according to claim 10 it is characterised in that
Device b2 includes:
Device b21. makes
f=[fvg+(fvg-fig)*ξ]*2 (1)
ki=2πf/fs(2)
Wherein, ξ is default penalty coefficient, fsFor the sample frequency of described photovoltaic energy storage inverter, by formula (1)
Draw k with formula (2)i；
Device b22. is by harmonic current ixInput adjustment factor is kiPr actuator, according to this pr adjust
The output of device generates described control signal.
12. photovoltaic energy storage inverter battery current control devices according to claim 9 it is characterised in that
In device b1, harmonic current ixFor battery current ibatWith its virtual value ibatDifference.
13. photovoltaic energy storage inverter battery current control devices according to claim 8 it is characterised in that
Dc/dc converter unit is buck circuit or boost circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510437903.0A CN106374828B (en) | 2015-07-22 | 2015-07-22 | Photovoltaic energy storage inverter and its battery current control method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510437903.0A CN106374828B (en) | 2015-07-22 | 2015-07-22 | Photovoltaic energy storage inverter and its battery current control method and device |
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| CN106374828B CN106374828B (en) | 2018-08-31 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20070009497A (en) * | 2006-11-28 | 2007-01-18 | (주) 다쓰테크 | Solar generating apparatus with a separating direct current generating module and managing system of the same |
| CN102801201A (en) * | 2012-09-14 | 2012-11-28 | 南开大学 | Automatic photovoltaic charging post control system |
| US20130155732A1 (en) * | 2011-12-15 | 2013-06-20 | Robert Gregory Wagoner | Methods and systems for operating a power converter |
| CN103475061A (en) * | 2013-09-18 | 2013-12-25 | 江苏建筑职业技术学院 | Photovoltaic intelligent controller |
-
2015
- 2015-07-22 CN CN201510437903.0A patent/CN106374828B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070009497A (en) * | 2006-11-28 | 2007-01-18 | (주) 다쓰테크 | Solar generating apparatus with a separating direct current generating module and managing system of the same |
| US20130155732A1 (en) * | 2011-12-15 | 2013-06-20 | Robert Gregory Wagoner | Methods and systems for operating a power converter |
| CN102801201A (en) * | 2012-09-14 | 2012-11-28 | 南开大学 | Automatic photovoltaic charging post control system |
| CN103475061A (en) * | 2013-09-18 | 2013-12-25 | 江苏建筑职业技术学院 | Photovoltaic intelligent controller |
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