CN109038666A - Solar panel output power regulating system - Google Patents
Solar panel output power regulating system Download PDFInfo
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- CN109038666A CN109038666A CN201810914773.9A CN201810914773A CN109038666A CN 109038666 A CN109038666 A CN 109038666A CN 201810914773 A CN201810914773 A CN 201810914773A CN 109038666 A CN109038666 A CN 109038666A
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 15
- 238000000465 moulding Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 23
- 230000007547 defect Effects 0.000 abstract description 6
- 230000005611 electricity Effects 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
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- 238000004891 communication Methods 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- H02J3/385—
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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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Abstract
The present invention discloses a kind of solar panel output power regulating system, it is characterized by comprising constant voltage control module, MPPT control module, switch control unit, busbar voltage dynamic adjustment unit, watt current soft start unit and SVPWM units, in which: constant voltage control module determines the target voltage of constant voltage control；MPPT control module tracks practical maximum power electrical voltage point；The switching of switch control unit implementation pattern；Busbar voltage dynamic adjustment unit and watt current soft start unit are respectively used to determine voltage, the current-order of inverter DC bus；SVPWM unit for realizing power device switch control.Remarkable result of the invention are as follows: combine two kinds of control methods, it realizes system and quickly tracks to practical maximum power point and steady operation, solve influence of the voltage ripple of power network to system stability, it also solves and photo-voltaic power supply is connected to the grid brought defect with MPPT method, improve the safety and stability of system.
Description
Technical field
The present invention relates to wireless communication technology fields, and in particular to a kind of two stages connectionless protocol money with collision detection
Source distribution method.
Background technique
Photovoltaic power generation is the main using form of solar energy, and independent photovoltaic generating system can be solved effectively without the few electricity of electricity
The power supply problem of from far-off regions and some special occasions.The output of solar panel has very strong non-linear, difference
The power difference that it is exported under illumination, temperature, external load, operating voltage is very big, needs that certain measure is taken to track photovoltaic
The maximum power point of battery.
Under the environmental conditions such as specific intensity of illumination and temperature, the solar panel P-V characteristic curve of photovoltaic cell
It is a unimodal curve, this illustrates photovoltaic cell under certain environmental conditions, has and only one maximum power point.
Maximal power tracing (Maximum Power Point Tracking, MPPT) control algolithm can be by solar-electricity
The working condition of pond plate is adjusted optimally.There are many kinds of MPPT algorithms, and most common MPPT is calculated in photovoltaic generating system
Method has perturbation observation method, conductance increment method and constant voltage tracing.Wherein perturbation observation method can not be by tracing step and tracking essence
Degree combines, and the responding ability of system external circle environmental change is also poor, has vibration in maximum power point and leads to power
Loss.
Application No. is 201210048303.1 patent of invention " maximum power point tracing method and systems " using constantly tune
Whole maximum fixed step size is repeatedly disturbed, and realizes maximal power tracing.Its defect is that the tracking velocity of multiple perturbation motion method is by step
Long and dash current limitation, speed is too slow, still has some deficits in practical applications.
Application No. is 201010170813.7 patent of invention, " a kind of dynamic adjustment busbar voltage improves the side of grid connection efficiency
Method " is related to a kind of method that dynamic adjustment busbar voltage improves grid connection efficiency, and bus electricity is adjusted according to the gear of network voltage
Instruction value is pressed, belonging to one kind has grade adjusting.But when using across when the continuous fluctuation of multiple voltage gears occurs in busbar voltage
The photovoltaic generating system of this method by occur output electric current transient impact and output power fluctuation situations such as.This illustrates that this is
System is not suitable for the inverter of single-stage inversion topological structure.
MPPT control method is finally to be realized by regulating system busbar voltage to MPPT maximum power point tracking, to meet
Grid-connected primary condition, busbar voltage must also be greater than the peak value of highest network voltage.Therefore, the output signal of MPPT, that is, bus electricity
Pressure instruction has to consider voltage ripple of power network, the especially influence of network voltage lifting.Otherwise, not only MPPT method cannot be real
Now to the tracking of solar panel maximum power point, it can make gird-connected inverter that can not stablize instead and be incorporated into the power networks, even
Off-grid failure occurs.
Summary of the invention
For the defects in the prior art, the invention proposes a kind of solar panel output power regulating system, energy
It is enough quickly to track to practical maximum power point and steady operation.And since very good solution voltage ripple of power network is steady to system
It qualitatively influences, which is suitable for single-stage or multistage parallel networking type photovoltaic inverter.
To achieve the above object, the technical solution adopted in the present invention is as follows:
A kind of solar panel output power regulating system, key are: controlling including constant voltage control module, MPPT
Molding block, switch control unit, busbar voltage dynamic adjustment unit, watt current soft start unit and SVPWM unit,
In:
The input terminal of the constant voltage control module is provided with the connecting interface of solar panel, and according to the sun
The open-circuit voltage of energy solar panel determines the target voltage of constant voltage control；
The input terminal of the MPPT control module is provided with the connecting interface of solar panel, and is chased after using MPPT mode
The practical maximum power electrical voltage point of track；
The switch control unit is for realizing the constant voltage control module and the MPPT control module access state
Switching；
The busbar voltage dynamic adjustment unit is used to determine the voltage instruction of inverter DC bus；
The watt current soft start unit is used to determine the current-order of inverter DC bus；
The SVPWM unit is used to carry out vector according to active power current-order and reactive power current-order,
SVPWM is exported, realizes the switch control of power device in inverter.
Within the system, the constant voltage control module is according to Um=k1·UocCome determine constant voltage control target voltage,
Wherein UocFor the open-circuit voltage of solar panel, coefficient k1Depending on the characteristic of photovoltaic cell, value range is 0.6~0.9.
In general, crystal silicon component characteristic value k1It is 0.8, film assembly characteristic value k1It is 0.72.
Optionally, the fundamental wave virtual value that the busbar voltage dynamic adjustment unit passes through three-phase voltage on acquisition grid line
Urms, then according toDetermine the voltage instruction of inverter DC busWhereinFor the output voltage of the constant voltage control module or the MPPT control module, k2For constant, η is the electricity of inverter
Crushing consumption, including the loss of PWM dead zone voltage, iron core of electric reactor loss and main circuit voltage loss.
Optionally, Voltage loop adjuster is additionally provided with before the watt current soft start unit, the Voltage loop is adjusted
One input terminal of device obtains the voltage instruction of inverter DC busAnother input terminal acquires busbar voltage actual value
Upv, the two obtains voltage deviation V after making the differenceerr, then PI adjusts to obtain active power current-orderThe wattful power
Rate current-orderThe electric current that the inverter DC bus is obtained after the watt current soft start cell processing refers to
It enables.
Optionally, on grid line three-phase voltage fundamental wave virtual valueWherein UA,UB,
UCRespectively A on alternating current cable, B, C three-phase voltage virtual value.
One of a kind of application scenarios as present system, which can be set in solar panel and grid-connected electricity
Between the line of force.
Remarkable result of the invention is:
By combining constant voltage control model and MPPT control method, realizes system and quickly track to practical maximum
Power points and steady operation, very good solution influence of the voltage ripple of power network to system stability.System proposed by the invention
It also solves and photo-voltaic power supply is connected to the grid brought defect using MPPT control method, improve the safety of system and steady
It is qualitative.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described.
Fig. 1 is solar panel output power regulating system structural block diagram；
Fig. 2 is solar panel theoretical maximum power points and practical maximum power point curve graph；
The position Fig. 3 electric current soft start schematic diagram.
Specific embodiment
It is described in detail below in conjunction with embodiment of the attached drawing to technical solution of the present invention.Following embodiment is only used for
Clearly illustrate technical solution of the present invention, therefore be only used as example, and cannot be used as a limitation and limit protection model of the invention
It encloses.
As shown in Figure 1, a kind of solar panel output power regulating system proposed by the invention, main includes fixed electricity
Press control module, MPPT control module, switch control unit, busbar voltage dynamic adjustment unit, watt current soft start unit
And SVPWM unit, in which:
The input terminal of the constant voltage control module is provided with the connecting interface of solar panel, and according to the sun
The open-circuit voltage of energy solar panel determines the target voltage of constant voltage control；
The input terminal of the MPPT control module is provided with the connecting interface of solar panel, and is chased after using MPPT mode
The practical maximum power electrical voltage point of track；
The switch control unit is for realizing the constant voltage control module and the MPPT control module access state
Switching；
The busbar voltage dynamic adjustment unit is used to determine the voltage instruction of inverter DC bus；
The watt current soft start unit is used to determine the current-order of inverter DC bus；
The SVPWM unit is used to carry out vector according to active power current-order and reactive power current-order,
SVPWM is exported, realizes the switch control of power device in inverter.
Optionally, the constant voltage control module is according to Um=k1·UocCome determine constant voltage control target voltage, wherein
Coefficient k1Depending on the characteristic of photovoltaic cell, UocFor the open-circuit voltage of solar panel.
Optionally, coefficient k1Value range be 0.6~0.9.
Optionally, the fundamental wave virtual value that the busbar voltage dynamic adjustment unit passes through three-phase voltage on acquisition grid line
Urms, then according toDetermine the voltage instruction of inverter DC busWhereinFor the output voltage of the constant voltage control module or the MPPT control module, k2For constant, η is inverter
The loss of PWM dead zone voltage, iron core of electric reactor loss and main circuit voltage loss.
Optionally, Voltage loop adjuster is additionally provided with before the watt current soft start unit, the Voltage loop is adjusted
One input terminal of device obtains the voltage instruction of inverter DC busAnother input terminal acquires busbar voltage actual value
Upv, the two obtains voltage deviation V after making the differenceerr, then PI adjusts to obtain active power current-orderThe wattful power
Rate current-orderThe electric current that the inverter DC bus is obtained after the watt current soft start cell processing refers to
It enables.
Optionally, on grid line three-phase voltage fundamental wave virtual valueWherein UA,UB,
UCRespectively A on alternating current cable, B, C three-phase voltage virtual value.
Optionally, which is arranged between solar panel and grid-connected power line.
In order to clearly illustrate the working principle and performance of present system, the present embodiment by step described in Fig. 1 into
Go reproduction, reconstruction processes specifically follow the steps below:
S1: under standby mode, solar panel open-circuit voltage U is acquiredoc, and operating mode is defaulted as constant voltage control
Mode；
S2: according to open-circuit voltage Uoc, calculate constant voltage and control target voltage Um, i.e. the theoretically corresponding voltage of maximum power
Point Um, as shown in Fig. 2, photovoltaic battery panel maximum power point voltage UmWith the open-circuit voltage U of photovoltaic cellocBetween linear pass
System, i.e. Um=k1×UocCoefficient k1Depending on the characteristic of photovoltaic cell, value range (0.6,0.9), general crystal silicon component feature
Value is 0.8, and film assembly characteristic value is 0.72；
S3: inverter initially enters constant voltage control model, and starts to generate electricity by way of merging two or more grid systems；
S4: condition judges current operation mode, if working in constant voltage mode, and inverter busbar voltage is not yet adjusted
To theoretical maximum power voltage point Um, S5 is thened follow the steps, it is no to then follow the steps S6；
S5: executing constant voltage control, and Voltage loop adjuster is directly to the voltage instruction U that sets the goal during inverter startupm,
The control model combination S10 electric current soft start unit inhibits the dash current in grid-connected start-up course；
S6: inverter current operation mode is switched into MPPT mode；
S7:MPPT mode is started to work, and actual maximum power electrical voltage point U is trackedMPP；
S8: varying DC link voltage unit: according to pulsewidth modulation rule, inverter DC bus-bar voltage amplitude need to be greater than line
Voltage fundamental peak-peak, i.e. k21.414 are taken, U in formula 1rmsFor the line voltage fundamental wave virtual value instantaneously calculated, η is inverse in formula 2
Become device voltage loss, including the loss of PWM dead zone voltage, iron core of electric reactor and main circuit voltage loss,For Isobarically Control
The output voltage of mode or MPPT control model, final Voltage loop busbar voltage instruction valueValue is not less than consideration line
The line voltage fundamental wave peak-peak of road voltage lossTo promote inverter direct-flow side control nargin, photovoltaic hair is promoted
The stability of electric system；
S9: Voltage loop adjuster makes the difference busbar voltage setting value and busbar voltage actual value, has by adjuster output
The instruction of function power current
S10: electric current soft start unit: inverter during startup, if directly to target value, since instruction value does not have
The process of slow add drop, will bring larger transient impact to the operation of inverter, causes inverter overcurrent or over-voltage fault.Cause
This, which can limit the dash current in start-up course, and active power current-order is made to become in slow increase
Gesture.As shown in figure 3, t1Time parameter is settable, t1Parameter setting range directly determine inverter under constant voltage control model
From open-circuit voltage UocDirectly it is adjusted to theoretical maximum power electrical voltage point UmSpeed.For example, t1It is set as 2s, then in constant voltage
Under control model, within 2 second time, inverter output power is adjusted to theoretical maximum power P from 0m, link combination S4 keeps away
Exempt under Isobarically Control mode, Voltage loop adjuster is directly to the voltage U that sets the goal during inverter startupmCaused electric current
Impact；
S11: according to active and reactive power current-order, vector is carried out, SVPWM is exported, to the function of gird-connected inverter
Rate device carries out switch control.
Wherein, in above-mentioned steps S11, two input terminals of SVPWM are respectively active power command end and reactive power
Command end, whereinIt indicates in dqUnder rotating coordinate system, watt current designated value；It indicates in dqUnder rotating coordinate system, idle electricity
Flow designated value；idIt indicates in dqUnder rotating coordinate system, watt current value of feedback；iqIt indicates in dqUnder rotating coordinate system, reactive current
Value of feedback；edIt indicates in dqUnder rotating coordinate system, network voltage d axis component；eqIt indicates in dqUnder rotating coordinate system, network voltage q
Axis component；L indicates photovoltaic DC-to-AC converter inductance；W indicates electrical network angular frequency；udIt indicates in dqUnder coordinate system, d shaft voltage control amount；uq
It indicates in dqUnder coordinate system, q shaft voltage control amount.
Remarkable result of the invention is: by combining constant voltage control model and MPPT control method, realizing and is
System quickly tracks to practical maximum power point and steady operation, very good solution shadow of the voltage ripple of power network to system stability
It rings.System proposed by the invention, which is also solved, is connected to the grid photo-voltaic power supply brought defect using MPPT control method, is mentioned
The high safety and stability of system.
By combining constant voltage control model and MPPT control method, realizes system and quickly track to practical maximum
Power points and steady operation, very good solution influence of the voltage ripple of power network to system stability.System proposed by the invention
It also solves and photo-voltaic power supply is connected to the grid brought defect using MPPT control method, improve the safety of system and steady
It is qualitative.Contribution is made that for the technology innovation of photovoltaic industry.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify to technical solution documented by previous embodiment, or some or all of the technical features are equal
Replacement；And these are modified or replaceed, the model for technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses, should all cover within the scope of the claims and the description of the invention.
Claims (7)
1. a kind of solar panel output power regulating system, it is characterised in that: controlled including constant voltage control module, MPPT
Module, switch control unit, busbar voltage dynamic adjustment unit, watt current soft start unit and SVPWM unit, in which:
The input terminal of the constant voltage control module is provided with the connecting interface of solar panel, and according to the solar-electricity
The open-circuit voltage of pond plate determines the target voltage of constant voltage control；
The input terminal of the MPPT control module is provided with the connecting interface of solar panel, and real using the tracking of MPPT mode
Border maximum power electrical voltage point；
The switch control unit is cut for realizing the constant voltage control module and the MPPT control module access state
It changes；
The busbar voltage dynamic adjustment unit is used to determine the voltage instruction of inverter DC bus；
The watt current soft start unit is used to determine the current-order of inverter DC bus；
The SVPWM unit is used to carry out vector, output according to active power current-order and reactive power current-order
SVPWM realizes the switch control of power device in inverter.
2. solar panel output power regulating system according to claim 1, it is characterised in that: the constant voltage control
Molding block is according to Um=k1·UocTo determine that constant voltage controls target voltage, wherein coefficient k1Depending on the characteristic of photovoltaic cell,
UocFor the open-circuit voltage of solar panel.
3. solar panel output power regulating system according to claim 2, it is characterised in that: coefficient k1Value
Range is 0.6~0.9.
4. solar panel output power regulating system according to claim 1, it is characterised in that: the busbar voltage
The fundamental wave virtual value U that dynamic adjustment unit passes through three-phase voltage on acquisition grid linerms, then according toDetermine the voltage instruction of inverter DC busWhereinIt is described
The output voltage of constant voltage control module or the MPPT control module, k2For constant, η is the voltage loss of inverter.
5. solar panel output power regulating system according to claim 4, it is characterised in that: the watt current
Voltage loop adjuster is additionally provided with before soft start unit, an input terminal of the Voltage loop adjuster obtains inverter direct current
The voltage instruction of busAnother input terminal acquires busbar voltage actual value Upv, the two obtains voltage deviation after making the difference
Verr, then PI adjusts to obtain active power current-orderThe active power current-orderBy described active
The current-order of the inverter DC bus is obtained after electric current soft start cell processing.
6. solar panel output power regulating system according to claim 4, it is characterised in that: three-phase on grid line
The fundamental wave virtual value of voltageWherein UA,UB,UCRespectively A on alternating current cable, B, C tri-
Phase voltage virtual value.
7. solar panel output power regulating system according to claim 4, it is characterised in that: system setting exists
Between solar panel and grid-connected power line.
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| CN201810914773.9A CN109038666B (en) | 2018-08-13 | 2018-08-13 | Solar cell panel output power regulating system |
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|---|---|---|---|
| CN201810914773.9A CN109038666B (en) | 2018-08-13 | 2018-08-13 | Solar cell panel output power regulating system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113795400A (en) * | 2019-05-13 | 2021-12-14 | 阿特拉斯科技控股有限公司 | Electric or hybrid vehicle with solar panels |
| CN114447993A (en) * | 2022-04-08 | 2022-05-06 | 深圳市首航新能源股份有限公司 | Power control method, device, controller and optical storage system |
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| CN109038666B (en) | 2020-04-28 |
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