CN106787729A - The control system and method for photovoltaic array delivery efficiency are improved under a kind of local shades - Google Patents
The control system and method for photovoltaic array delivery efficiency are improved under a kind of local shades Download PDFInfo
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- CN106787729A CN106787729A CN201710069786.6A CN201710069786A CN106787729A CN 106787729 A CN106787729 A CN 106787729A CN 201710069786 A CN201710069786 A CN 201710069786A CN 106787729 A CN106787729 A CN 106787729A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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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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- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses control system and method that photovoltaic array delivery efficiency is improved under a kind of local shades, including shadow Detection module, dsp controller, switches set and photovoltaic array, shadow Detection module is connected with dsp controller, and dsp controller is connected with switches set, and switches set is connected with photovoltaic array.Whether there is shadow occlusion using shadow Detection module real-time detection photovoltaic module, dsp controller is controlled according to the testing result of shadow Detection module to switches set, the photovoltaic module being blocked by shadow is realized location swap with the photovoltaic module not being blocked by shadow, realize shade discretization.Control system of the invention and control method can carry out discretization to local shades, reduce negative effect of the local shades to whole photovoltaic system, make photovoltaic array peak power output increase about 20%, effectively improve the generating efficiency of photovoltaic system, compared with modular and reconstruct formula photovoltaic generating system, the control system is more effective, it is easier to realize.
Description
Technical field
The invention belongs to technical field of photovoltaic power generation, and in particular to improve photovoltaic array delivery efficiency under a kind of local shades
Control system and method.
Background technology
The two large problems that today's society faces --- problem of environmental pollution and problem of energy crisis, wherein environmental problem are clear
Be presented on we everyone in face of, water pollution at one's side, Pekinese's haze etc..Oil be the mankind it is with the most use can not
The renewable sources of energy, due to the excessive problem that exploitation brings surface subsidence and water pollution of excavating, and the energy 75% of China's consumption
From coal, and increasingly depleted, bring various problem of environmental pollutions, a large amount of exploitations of these non-renewable energy resources and profit
With the variety of problems brought, the warp-wise mankind have beaten alarm bell.One of regenerative resource --- solar energy, its advantage is without dirt
Dye and aboundresources, the average annual intensity of illumination of the earth are 0.201kW/m2, can be obtained from the sun within 1 year equivalent to the earth
The energy of 102000TW.Therefore, solar energy is of great interest by its advantageous advantage.Solar energy will be in people
More and more important role is play in class life.Opto-electronic conversion is irresistible, and under the leader of country, photovoltaic generation industry will
Obtain permanent development.
In photovoltaic generating system, cost and efficiency are all the time every researcher's issues that need special attentions.
Because single photovoltaic cell output voltage and power grade are limited, it is difficult to meet actual requirement, therefore need with series-parallel mode group
Synthesis photovoltaic array is used in putting into photovoltaic generating system again, and influence of the local shades to photovoltaic array is greatly, easily makes light
There is mismatch loss phenomenon in photovoltaic array, or even " hot spot effect " occurs and damage photovoltaic cell, under making system output power drastically
Drop.Therefore, how to weaken influence of the local shades to photovoltaic system becomes hot research content.Early stage is occurred in that using in parallel
The method of bypass diode prevents from, by the generation for blocking photovoltaic cell consumption power and " hot spot effect ", and applying blocking
Diode is to avoid electric current from inversely transmitting, and this method is simpler, and the influence of local shades is weakened to a certain extent.
N.K.Gautam et al. is carried out to series parallel structure (SP), three kinds of array structures of network structure (TCT) and bridge architecture (BL)
Compare, in terms of loss late, peak power output, reliability etc., it was demonstrated that caused by shade, photovoltaic cell parameter error etc.
Influence of the mismatch problems to TCT and BL structures is smaller than SP structure.There is scholar to propose a kind of building based on DC Module afterwards
The electrical structure of integrated photovoltaic system, i.e. modular optical photovoltaic generating system, each photovoltaic module have independent band MPPT work(
The DC-DC converter of energy, this method enhances the anti-shade ability of system, but makes cost apprentice because the converter for needing is more
Increase.Period there is scholar to compare photovoltaic generating system under shadowed condition again in three kinds of typical converter configuration structures, that is, collect
Chinese style, string data and modular, it is found that centralized converter configuration structure has more efficiency and reliability, also because it is only needed in one
Centre converter and it is more economical, but it uses SP photovoltaic array structures, unlike TCT and BL structure output work(during local shades
Rate is high.There is document to propose reconstruct formula photovoltaic generating system later, will photovoltaic array be divided into fixed part and movable part, when
When fixed part is blocked by local shades, the photovoltaic module in movable part replaces the photovoltaic module being blocked, so that
Photovoltaic array after reconstruct does not have any shade, and efficient purpose is put forward so as to reach, but in the case of no local shades,
Movable part is idle, wastes resource, also improves cost.
In sum, the method for photovoltaic system efficiency has respective lacking in the case of existing raising local shades
Point, although wherein simple only with the method for bypass diode in parallel and blocking diode, its effect is not apparent；Mould
The DC-DC converter that block formula photovoltaic generating system needs is more, so that cost increases severely；And formula photovoltaic generating system is reconstructed fine
Idle photovoltaic array is produced in the case of it, cost is also improved.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of control of raising photovoltaic array delivery efficiency under local shades
System and method, can reduce negative effect of the local shades to whole photovoltaic system, improve the generating efficiency of photovoltaic system, reduce
Cost.
In order to solve the above technical problems, the present invention is adopted makees following technical scheme：
The control system of photovoltaic array delivery efficiency, including shadow Detection module, DSP control are improved under a kind of local shades
Device, switches set and photovoltaic array, shadow Detection module are connected with dsp controller, and dsp controller is connected with switches set, switches set
It is connected with photovoltaic array.
The shadow Detection module includes power detection module, signal amplification module and power module, power detection module
Input connect output voltage terminal and the output current end of each photovoltaic module in photovoltaic array, power detection module respectively
Output end connect the input of signal amplification module, the output end of signal amplification module connects the input of dsp controller；Electricity
Source module provides operating voltage to power detection module, signal amplification module and dsp controller respectively.
The power detection module uses power measurement chip HLW8012.
The photovoltaic array uses TCT structure photovoltaic arrays.
The switches set includes：The input and output end of each photovoltaic module respectively concatenate an independent switch, Mei Yilie
The front and rear two neighboring photovoltaic module of photovoltaic module, the independent switch and latter light of the input concatenation of previous photovoltaic module
There is points of common connection between the independent switch of the output end series connection for lying prostrate component；The front and rear two neighboring photovoltaic of each row photovoltaic module
Component is controlled by one group of linked switch, and every group of linked switch includes four linked switches, first linked switch with it is previous
The series arm parallel connection that the independent switch of individual photovoltaic module and its input concatenation is formed, second linked switch and latter light
The string that the independent switch that the independent switch of volt component output end concatenation and previous photovoltaic module and its two ends concatenate respectively is formed
Connection branch circuit parallel connection, independent switch and latter photovoltaic group that the 3rd linked switch is concatenated with the input of previous photovoltaic module
The series arm that the independent switch of part and its two ends concatenation is formed is in parallel, the 4th linked switch and latter photovoltaic module and its
The series arm that the independent switch of output end concatenation is formed is in parallel.
A kind of method that photovoltaic array delivery efficiency is improved under local shades, using under a kind of local shades as described above
The control system of photovoltaic array delivery efficiency is improved, is comprised the following steps：
S010：The shadow Detection module is respectively to the output voltage and output current of each photovoltaic module in photovoltaic array
Real-time sampling is carried out, the power signal of each photovoltaic module is exported respectively after treatment；
S020：Power signal obtained by signal amplification module receiving step S010 sends to after being amplified treatment respectively
Dsp controller；
S030：Power signal after dsp controller receiving step S020 enhanced processings simultaneously judges whether photovoltaic module is hidden
Gear, the photovoltaic module is blocked by shadow if performance number is less than normal value, otherwise is not blocked；
S040：The shut-off of dsp controller switches set according to discretization rule control, makes the photovoltaic group being blocked by shadow
Part realizes location swap with the photovoltaic module not being blocked by shadow, and makes shade discretization；
S050：Circulation performs above-mentioned steps S010 to step S040.
The discretization rule is：Photovoltaic module to photovoltaic array carries out serial number, if shadow-free is blocked, keeps
Each switch original state；If there is local shades to block, the photovoltaic module of the even numbers numbering that will be blocked by shadow hides with shadow-free
The position of the odd number numbering photovoltaic module of gear is interchangeable, it is ensured that the photovoltaic module shadow-free of even numbers numbering hides in photovoltaic array
Gear；Or conversely, photovoltaic module and the shadow-free of the odd number numbering that will the be blocked by shadow even numbers numbering photovoltaic module that blocks
Position is interchangeable, it is ensured that the photovoltaic module shadow-free of odd number numbering is blocked in photovoltaic array；If local shades disappear, recover
Switch original state.
The advantage of the invention is that：
Present system and method can in real time reduce negative effect of the local shades to whole photovoltaic system, make photovoltaic array
Peak power output increase about 20%, effectively increases the generating efficiency of photovoltaic system, with modular and reconstruct formula photovoltaic generation
System is compared, and the method is more effective, it is easier to realized.
Brief description of the drawings
Fig. 1 is the structural representation of the control system that photovoltaic array delivery efficiency is improved under a kind of local shades of the invention；
Fig. 2 is view of the control system of the invention in shade Zhi Dang local times；
Fig. 3 is the structural representation of shadow Detection module in Fig. 1；
Fig. 4 is output P_U performance diagram of the photovoltaic array of the embodiment of the present invention 1 before and after shade discretization；
In figure, A be it is discrete after output P_U characteristic curves, B be it is discrete before output P_U characteristic curves.
Fig. 5 is output P_U performance diagram of the photovoltaic array of the embodiment of the present invention 2 before and after shade discretization；
In figure, C be it is discrete after output P_U characteristic curves, D be it is discrete before output P_U characteristics.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples, but does not constitute the limit to the scope of the present invention
System.
As shown in figure 1, the control system of photovoltaic array delivery efficiency is improved under a kind of local shades of the invention, including shade
Detection module P1, dsp controller P2, switches set P3 and photovoltaic array, shadow Detection module P1 are connected with dsp controller P2, DSP
Controller P2 is connected with switches set P3, and switches set P3 is connected with photovoltaic array.
Photovoltaic array described in the present embodiment includes altogether 10 using the TCT structure photovoltaic arrays of the row of 5 row 2 in photovoltaic array
Individual photovoltaic module P4, and from top to bottom respectively to this 10 photovoltaic module P4 serial numbers since first row.
As shown in figure 3, the shadow Detection module P1 includes power detection module, signal amplification module and power module,
The input of power detection module connects output voltage terminal and the output current end of each photovoltaic module P4, power detection respectively
The output end of module connects the input of signal amplification module, and the output end connection dsp controller P2's of signal amplification module is defeated
Enter end；Power module provides operating voltage to power detection module, signal amplification module and dsp controller P2 respectively.The work(
Rate detection module uses power measurement chip HLW8012.
As shown in figure 1, the switches set P3 includes：The input and output end of each photovoltaic module respectively concatenate an independence
The input concatenation independent switch S of switch, such as photovoltaic module 11', output end concatenation independent switch S1；The input of photovoltaic module 2
Concatenation independent switch S2', output end concatenation independent switch S2, remaining photovoltaic module is similar.Each row photovoltaic module it is front and rear
Two neighboring photovoltaic module, the independent switch and the latter output end of photovoltaic module of the input concatenation of previous photovoltaic module
There are points of common connection, such as independent switch S between the independent switch of series connection1' and independent switch S2There are points of common connection A, independent switch
S2' and independent switch S3There is points of common connection B.The front and rear two neighboring photovoltaic module of each row photovoltaic module is opened by one group of linkage
Pass is controlled, and every group of linked switch includes four linked switches, first linked switch and previous photovoltaic module and its defeated
Enter the series arm parallel connection that the independent switch of end concatenation is formed, second linked switch is concatenated with latter photovoltaic module output end
Independent switch and the series arm that is formed of the independent switch that concatenates respectively of previous photovoltaic module and its two ends it is in parallel, the 3rd
Independent switch that linked switch is concatenated with the input of previous photovoltaic module and latter photovoltaic module and its two ends concatenation
The series arm that independent switch is formed is in parallel, the independence that the 4th linked switch is concatenated with latter photovoltaic module and its output end
Switch the series arm for being formed in parallel.Such as：Linked switch S21It is connected in parallel between the output end of photovoltaic module 1 and points of common connection A,
Linked switch S22It is connected in parallel on the output end and independent switch S of photovoltaic module 21Output end between, linked switch S23It is connected in parallel on light
Between the input and points of common connection B of volt component 1, linked switch S24It is connected in parallel on the input of photovoltaic module 2 and commonly connected
Between point A.
A kind of method that the control system of photovoltaic array delivery efficiency is improved under local shades, using one kind as described above
The control system of photovoltaic array delivery efficiency is improved under local shades, is comprised the following steps：
S010：The shadow Detection module is respectively to the output voltage and output current of each photovoltaic module in photovoltaic array
Real-time sampling is carried out, the power signal of each photovoltaic module is exported respectively after treatment；
S020：Power signal obtained by signal amplification module receiving step S010 sends to after being amplified treatment respectively
Dsp controller；
S030：Power signal after dsp controller receiving step S020 enhanced processings simultaneously judges whether photovoltaic module is hidden
Gear, the photovoltaic module is blocked by shadow if performance number is less than normal value, otherwise is not blocked；
S040：The shut-off of dsp controller switches set according to discretization rule control, makes the photovoltaic group being blocked by shadow
Part realizes location swap with the photovoltaic module not being blocked by shadow, and makes shade discretization；
S050：Circulation performs above-mentioned steps S010 to step S040, improves the real-time power output of photovoltaic array.
The discretization rule is：Photovoltaic module to photovoltaic array carries out serial number, if shadow-free is blocked, keeps
Each switch original state；If there is local shades to block, the photovoltaic module of the even numbers numbering that will be blocked by shadow hides with shadow-free
The position of the odd number numbering photovoltaic module of gear is interchangeable, it is ensured that the photovoltaic module shadow-free of even numbers numbering hides in photovoltaic array
Gear；Or conversely, photovoltaic module and the shadow-free of the odd number numbering that will the be blocked by shadow even numbers numbering photovoltaic module that blocks
Position is interchangeable, it is ensured that the photovoltaic module shadow-free of odd number numbering is blocked in photovoltaic array；If local shades disappear, recover
Switch original state.
The original state of each switch is as shown in figure 1, all independent switch original states are closure state, Suo Youlian
The original state of dynamic switch is off-state.
Embodiment 1：
As shown in Fig. 2 the TCT structures photovoltaic array of the present embodiment picks up gear part, shadow Detection by the shade that cloud is formed
Module detects that photovoltaic module 2 in photovoltaic array, photovoltaic module 3, photovoltaic module 7, photovoltaic module 8 are blocked by shadow, DSP
Controller controls the shut-off of each switches set breaker in middle to realize shade discretization according to the testing result of shadow Detection module, because
To ensure after discretization even numbers numbering photovoltaic module there is no shadow occlusion, so when only need to be by photovoltaic module 2 and photovoltaic module 8
Place-exchange is carried out with other odd number numbering photovoltaic modulies for not having shadow occlusion respectively, that is, simultaneously switches off independent switch S1, solely
Vertical switch S1', independent switch S2With independent switch S2' and it is closed at linked switch S21, linked switch S22, linked switch S23With
Linked switch S24, you can realize that photovoltaic module 2 is exchanged with photovoltaic module 1.Simultaneously switch off independent switch S8, independent switch S8', solely
Vertical switch S9With independent switch S9' and it is closed at linked switch S81, linked switch S82, linked switch S83With linked switch S84,
It is capable of achieving photovoltaic module 8 to be exchanged with photovoltaic module 9, finally realizes shade discretization.
As shown in figure 4, before shade discretization, the maximum output power point P of photovoltaic arrayAPlace's performance number is 2593.0W, most
High-power point PAPlace's magnitude of voltage is 143.2V, after shade discretization, the maximum output power point P of photovoltaic arrayBPlace's performance number is changed into
3247.0W, maximum power point PBPlace's magnitude of voltage is 243.5V.It can be seen that, after shade discretization, the peak power output of photovoltaic array
Value increased 654.0W, that is, increased 20.1%.
Embodiment 2：
The TCT structures photovoltaic array of the present embodiment picks up gear part by the shade that massif is formed, and shadow Detection module is detected
Photovoltaic module 3, photovoltaic module 4 and photovoltaic module 9 in photovoltaic array are blocked by shadow, and dsp controller is according to shadow Detection
The testing result of module, controls the shut-off opened the light in each switches set to realize shade discretization, because to ensure even numbers after discretization
The photovoltaic module of numbering does not have shadow occlusion, so when only need to by photovoltaic module 4 with other not have shadow occlusion odd numbers number
Photovoltaic module carries out place-exchange, that is, simultaneously switch off independent switch S4, independent switch S4', independent switch S5With independent switch S5′
And it is closed at linked switch S51, linked switch S52, linked switch S53With linked switch S54, you can realize photovoltaic module 4 and light
Volt component 5 is exchanged, and finally realizes shade discretization.
As shown in figure 5, before shade discretization, the maximum output power point P of photovoltaic arrayCPlace's performance number is 2670.0W, most
High-power point PCPlace's magnitude of voltage is 255.9V, after shade discretization, the maximum output power point P of photovoltaic arrayDPlace's performance number is changed into
3302.0W, maximum power point PDPlace's magnitude of voltage is 247.9V.It can be seen that, after shade discretization, the peak power output of photovoltaic array
Value increased 632.0W, that is, increased 19.1%.
Can be drawn a conclusion by above example：
The system and method for photovoltaic array delivery efficiency is improved under a kind of local shades of the present invention, photovoltaic array can be made maximum
Power output increase about 20%, can in real time reduce negative effect of the local shades to whole photovoltaic system, effectively increase photovoltaic
The generating efficiency of system.
Claims (7)
1. the control system of photovoltaic array delivery efficiency is improved under a kind of local shades, it is characterised in that including shadow Detection mould
Block, dsp controller, switches set and photovoltaic array, shadow Detection module are connected with dsp controller, and dsp controller connects with switches set
Connect, switches set is connected with photovoltaic array.
2. the control system of photovoltaic array delivery efficiency is improved under a kind of local shades as claimed in claim 1, and its feature exists
In the shadow Detection module includes power detection module, signal amplification module and power module, the input of power detection module
End connects output voltage terminal and the output current end of each photovoltaic module in photovoltaic array, the output of power detection module respectively
The input of end connection signal amplification module, the output end of signal amplification module connects the input of dsp controller；Power module
Operating voltage is provided respectively to power detection module, signal amplification module and dsp controller.
3. the control system of photovoltaic array delivery efficiency is improved under a kind of local shades as claimed in claim 2, and its feature exists
In the power detection module uses power measurement chip HLW8012.
4. the control system of photovoltaic array delivery efficiency is improved under a kind of local shades as claimed in claim 1, and its feature exists
In the photovoltaic array uses TCT structure photovoltaic arrays.
5. the control system of photovoltaic array delivery efficiency is improved under a kind of local shades as claimed in claim 4, and its feature exists
In the switches set includes：The input and output end of each photovoltaic module respectively concatenate an independent switch, each row photovoltaic group
The front and rear two neighboring photovoltaic module of part, the independent switch and latter photovoltaic module of the input concatenation of previous photovoltaic module
Output end series connection independent switch between have points of common connection；The front and rear two neighboring photovoltaic module of each row photovoltaic module by
One group of linked switch is controlled, and every group of linked switch includes four linked switches, first linked switch and previous photovoltaic
The series arm parallel connection that the independent switch of component and its input concatenation is formed, second linked switch and latter photovoltaic module
The series arm that the independent switch that the independent switch of output end concatenation and previous photovoltaic module and its two ends concatenate respectively is formed
Parallel connection, independent switch that the 3rd linked switch is concatenated with the input of previous photovoltaic module and latter photovoltaic module and its
The series arm parallel connection that the independent switch of two ends concatenation is formed, the 4th linked switch and latter photovoltaic module and its output end
The series arm that the independent switch of concatenation is formed is in parallel.
6. under a kind of local shades improve photovoltaic array delivery efficiency method, it is characterised in that using as claim 1-5 it
The control system of photovoltaic array delivery efficiency is improved under a kind of local shades described in one, is comprised the following steps：
S010：The shadow Detection module is carried out to the output voltage and output current of each photovoltaic module in photovoltaic array respectively
Real-time sampling, exports the power signal of each photovoltaic module respectively after treatment；
S020：Power signal obtained by signal amplification module receiving step S010 sends DSP controls to after being amplified treatment respectively
Device processed；
S030：Power signal after dsp controller receiving step S020 enhanced processings simultaneously judges whether photovoltaic module is blocked, if
Less than normal value, then the photovoltaic module is blocked by shadow performance number, otherwise is not blocked；
S040：The shut-off of dsp controller switches set according to discretization rule control, make the photovoltaic module that is blocked by shadow with
The photovoltaic module not being blocked by shadow realizes location swap, makes shade discretization；
S050：Circulation performs above-mentioned steps S010 to step S040.
7. the method that photovoltaic array delivery efficiency is improved under a kind of local shades as claimed in claim 6, it is characterised in that institute
Stating discretization rule is：Photovoltaic module to photovoltaic array carries out serial number, if shadow-free is blocked, keeps each switch initial
State；If there is local shades to block, photovoltaic module and the odd number that shadow-free is blocked of the even numbers numbering that will be blocked by shadow are compiled
The position of number photovoltaic module is interchangeable, it is ensured that the photovoltaic module shadow-free of even numbers numbering is blocked in photovoltaic array；Or conversely,
The position of the even numbers numbering photovoltaic module that the photovoltaic module of the odd number numbering that will be blocked by shadow is blocked with shadow-free is interchangeable,
Ensure that the photovoltaic module shadow-free of odd number numbering in photovoltaic array is blocked；If local shades disappear, recover switch original state.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108008633A (en) * | 2017-12-11 | 2018-05-08 | 甘肃省电力公司风电技术中心 | Irradiation level comprising a variety of Changes in weather and photovoltaic module coordinate incidence relation method for building up |
| CN108983861A (en) * | 2018-07-03 | 2018-12-11 | 华南理工大学 | Optimal power point-tracking method when generation part shading grid-connected based on photovoltaic multi-electrical level inverter |
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