CN105811462A - High-energy-efficiency photovoltaic power supply method - Google Patents
High-energy-efficiency photovoltaic power supply method Download PDFInfo
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- CN105811462A CN105811462A CN201610309366.6A CN201610309366A CN105811462A CN 105811462 A CN105811462 A CN 105811462A CN 201610309366 A CN201610309366 A CN 201610309366A CN 105811462 A CN105811462 A CN 105811462A
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- charging
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000005070 sampling Methods 0.000 claims abstract description 31
- 238000007599 discharging Methods 0.000 claims abstract description 23
- 230000033228 biological regulation Effects 0.000 claims description 15
- 230000009466 transformation Effects 0.000 claims description 6
- 230000000295 complement effect Effects 0.000 claims 1
- 230000007423 decrease Effects 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract 2
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- H02J3/383—
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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
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a high-energy-efficiency photovoltaic power supply method. A Boost output voltage sampling unit samples the voltage signal UBoost of an output bus of a boosted circuit; a charging-discharging voltage sampling unit samples the output charging-discharging voltage signal UBuck of a conversion circuit; a charging-discharging current sampling unit samples the output charging current signal IBuck of the conversion circuit; and an inversion current sampling unit samples the output current signal IINV of a full-bridge inversion circuit. According to the high-energy-efficiency photovoltaic power supply method, operations in four kinds of operating modes can be provided: 1) an operation under photovoltaic power supply and storage battery charging; 2) a loaded operation under photovoltaic power supply and output connected with a power grid; 3) a loaded operation under photovoltaic power supply, storage battery charging-discharging and output connected with the power grid; and 4) a loaded operation under storage battery discharging and connection with the power grid.
Description
Technical field
The invention belongs to family energy-storage system, be specifically related to a kind of high energy efficiency photovoltaic power supply method.
Background technology
The general family green energy resource system of current Application comparison is usually photovoltaic generating system, mainly includes solar energy photovoltaic panel, controller, accumulator, combining inverter.System structure is generally adopted photovoltaic array and connects accumulator by control of charging, and accumulator receives inverter, and inverter output end is grid-connected.
This kind of structure service machine is too much, and capacity usage ratio is on the low side, and operating mode is simple, lacks necessary efficient scheduling and controls.
Summary of the invention
For solving above-mentioned technical problem, the invention provides a kind of high energy efficiency photovoltaic power supply method, it comprises the following steps:
Voltage signal UBoost by the output bus of the Boost output voltage sampling unit described booster circuit of sampling；By charging/discharging voltage sampling unit, the output charging/discharging voltage signal UBuck of sampling transformation circuit；Output charging current signal IBuck by charge discharge electric current sampling unit sampling transformation circuit；Output current signal IINV by inverter current sampling unit sampling full bridge inverter；
By one first voltage controller, the output valve UBoost of busbar voltage command value U*Boost1 Yu busbar voltage sample circuit is taken difference, through PI controller (PI_1) control and regulation output Iref1；
By the second voltage controller, the output valve UBuck of charging/discharging voltage command value U*Buck Yu charging/discharging voltage sample circuit is taken difference, through the 2nd PI controller (PI_2) control and regulation output Iref2；
Size according to the first voltage controller output valve Iref1 and the second voltage controller output valve Iref2 arranges the output valve I*Buck of described amplitude limit control unit；
The output valve I*Buck of amplitude limit control unit and charging and discharging currents sample circuit output valve IBuck is taken difference, drives dutycycle to PWM generator through the 3rd PI controller (PI_3) control and regulation output, drive translation circuit；
By the 4th voltage controller, the output valve UBoost of busbar voltage command value U*Boost2 Yu busbar voltage sample circuit is taken difference, through the 4th PI controller (PI_4) control and regulation output I*boost1；
Inverter current sample circuit output valve IINV and parallel network circuit current sampling data circuit output valve Igrid is taken difference by described grid-connected electric controller of not bothering to see me out, and obtains inverter current amplitude limit value I*boost2；
Limit the 4th voltage controller output valve I*boost1 less than the grid-connected electric controller I*boost2 that do not bother to see me out by current limit unit, the output valve I*boost of described current limit unit is set；
Finally by described inverter current controller the sine value that the output valve I*boost of amplitude limit control unit obtains with phaselocked loop is multiplied and obtains inverter current command value I*INV and inverter current sample circuit output valve IINV and take difference, drive dutycycle to PWM generator through the 5th PI controller (PI_5) control and regulation output, drive full-bridge inverter circuit.
The method have the advantages that
The present invention can provide the work of four kinds of regime mode: 1) photovoltaic power supply, accumulator charge operation；2) photovoltaic power supply, export and grid-connected connect load running；3) photovoltaic power supply, accumulator cell charging and discharging export grid-connected run with load；4) battery discharging, grid-connected run with load.
Certainly, the arbitrary product implementing the present invention it is not absolutely required to reach all the above advantage simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below the accompanying drawing that embodiment describes required use is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is high energy efficiency photovoltaic power supply method system structure chart provided by the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, all other embodiments that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
As shown in Figure 1, the invention provides a kind of high energy efficiency photovoltaic power supply method system, it includes photovoltaic module 1, booster circuit 2, translation circuit 3, memory element 4, full-bridge inverter circuit 5, civil power 6, and described photovoltaic module 1 passes through the dc bus that described booster circuit 2 provides stable；The transformed circuit 3 of described memory element 4 is articulated on dc bus, completes the charge and discharge control of memory element；Described civil power 6 and load 7 are articulated on dc bus through full bridge inverter 5, complete the power supply control of load；
The invention provides a kind of high energy efficiency photovoltaic power supply method, it comprises the following steps:
Voltage signal UBoost by the output bus of the Boost output voltage sampling unit described booster circuit of sampling；By charging/discharging voltage sampling unit, the output charging/discharging voltage signal UBuck of sampling transformation circuit；Output charging current signal IBuck by charge discharge electric current sampling unit sampling transformation circuit；Output current signal IINV by inverter current sampling unit sampling full bridge inverter；
By one first voltage controller, the output valve UBoost of busbar voltage command value U*Boost1 Yu busbar voltage sample circuit is taken difference, through PI controller (PI_1) control and regulation output Iref1；
By the second voltage controller, the output valve UBuck of charging/discharging voltage command value U*Buck Yu charging/discharging voltage sample circuit is taken difference, through the 2nd PI controller (PI_2) control and regulation output Iref2；
Size according to the first voltage controller output valve Iref1 and the second voltage controller output valve Iref2 arranges the output valve I*Buck of described amplitude limit control unit；
The output valve I*Buck of amplitude limit control unit and charging and discharging currents sample circuit output valve IBuck is taken difference, drives dutycycle to PWM generator through the 3rd PI controller (PI_3) control and regulation output, drive translation circuit；
By the 4th voltage controller, the output valve UBoost of busbar voltage command value U*Boost2 Yu busbar voltage sample circuit is taken difference, through the 4th PI controller (PI_4) control and regulation output I*boost1；
Inverter current sample circuit output valve IINV and parallel network circuit current sampling data circuit output valve Igrid is taken difference by described grid-connected electric controller of not bothering to see me out, and obtains inverter current amplitude limit value I*boost2；
Limit the 4th voltage controller output valve I*boost1 less than the grid-connected electric controller I*boost2 that do not bother to see me out by current limit unit, the output valve I*boost of described current limit unit is set；
Finally by described inverter current controller the sine value that the output valve I*boost of amplitude limit control unit obtains with phaselocked loop is multiplied and obtains inverter current command value I*INV and inverter current sample circuit output valve IINV and take difference, drive dutycycle to PWM generator through the 5th PI controller (PI_5) control and regulation output, drive full-bridge inverter circuit.
Present invention disclosed above preferred embodiment is only intended to help to set forth the present invention.Preferred embodiment does not have all of details of detailed descriptionthe, is not intended to the detailed description of the invention that this invention is only described yet.Obviously, the content according to this specification, can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is to explain principles of the invention and practical application better, so that skilled artisan can be best understood by and utilize the present invention.The present invention is limited only by the restriction of claims and four corner thereof and equivalent.
Claims (2)
1. a high energy efficiency photovoltaic power supply method, it is characterised in that comprise the following steps:
Voltage signal U by the output bus of the Boost output voltage sampling unit described booster circuit of samplingBoost；By charging/discharging voltage sampling unit, the output charging/discharging voltage signal U of sampling transformation circuitBuck；Output charging current signal I by charge discharge electric current sampling unit sampling transformation circuitBuck；Output current signal I by inverter current sampling unit sampling full bridge inverterINV；
By one first voltage controller by busbar voltage command value U*Boost1Output valve U with busbar voltage sample circuitBoostTake difference, through PI controller (PI_1) control and regulation output Iref1；
By the second voltage controller by charging/discharging voltage command value U*BuckOutput valve U with charging/discharging voltage sample circuitBuckTake difference, through the 2nd PI controller (PI_2) control and regulation output Iref2；
According to the first voltage controller output valve Iref1With the second voltage controller output valve Iref2Size the output valve I* of described amplitude limit control unit is setBuck；
Output valve I* by amplitude limit control unitBuckWith charging and discharging currents sample circuit output valve IBuckTake difference, drive dutycycle to PWM generator through the 3rd PI controller (PI_3) control and regulation output, drive translation circuit；
By the 4th voltage controller by busbar voltage command value U*Boost2Output valve U with busbar voltage sample circuitBoostTake difference, through the 4th PI controller (PI_4) control and regulation output I*boost1；
Described grid-connected electric controller of not bothering to see me out is by inverter current sample circuit output valve IINVWith parallel network circuit current sampling data circuit output valve IgridTake difference, obtain inverter current amplitude limit value I*boost2；
The 4th voltage controller output valve I* is limited by current limit unitboost1Less than the grid-connected electric controller I* that do not bother to see me outboost2, the output valve I* of described current limit unit is setboost；
Finally by described inverter current controller by the output valve I* of amplitude limit control unitboostThe sine value obtained with phaselocked loop is multiplied and obtains inverter current command value I*INVWith inverter current sample circuit output valve IINVTake difference, drive dutycycle to PWM generator through the 5th PI controller (PI_5) control and regulation output, drive full-bridge inverter circuit.
2. high energy efficiency photovoltaic power supply method system as claimed in claim 1, it is characterised in that when photovoltaic energy is higher than bearing power, VBoostVoltage raises, and exceedes accumulator charging instruction voltage V*Boost1, now described full bridge inverter starting storage battery charge function；When photovoltaic energy is lower than bearing power, VBoostVoltage declines, lower than the discharge voltage V* of accumulatorBoost2, the now discharging function of described full bridge inverter starting storage battery, keep DC bus-bar voltage not decline；When bearing power exceed photovoltaic energy and accumulator output and time, full bridge inverter is with maximum power output, and its complementary energy is by electrical network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610309366.6A CN105811462A (en) | 2016-05-10 | 2016-05-10 | High-energy-efficiency photovoltaic power supply method |
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| CN201610309366.6A CN105811462A (en) | 2016-05-10 | 2016-05-10 | High-energy-efficiency photovoltaic power supply method |
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| CN105811462A true CN105811462A (en) | 2016-07-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105490306A (en) * | 2016-02-03 | 2016-04-13 | 合肥聚能新能源科技有限公司 | Photovoltaic energy storage grid-connected power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105490306A (en) * | 2016-02-03 | 2016-04-13 | 合肥聚能新能源科技有限公司 | Photovoltaic energy storage grid-connected power supply system |
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Application publication date: 20160727 |