CN104460818B - Maximum-power-point global scanning method, inverter and photovoltaic system - Google Patents
Maximum-power-point global scanning method, inverter and photovoltaic system Download PDFInfo
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- CN104460818B CN104460818B CN201410765809.3A CN201410765809A CN104460818B CN 104460818 B CN104460818 B CN 104460818B CN 201410765809 A CN201410765809 A CN 201410765809A CN 104460818 B CN104460818 B CN 104460818B
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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 invention provides a maximum-power-point global scanning method, an inverter and a photovoltaic system. The maximum-power-point global scanning method includes: firstly, judging whether global scanning is needed or not; secondly, when global scanning is needed, subjecting busbar voltage of the inverter in the photovoltaic system to judgment, maximum-power-point scanning and processing; thirdly, processing operating states of DC (direct current)/DC converters; fourthly, subjecting multi-channel PV input to maximum-power-point global scanning so as to find a maximum power point of each PV array; finally, after maximum-power-point global scanning is terminated, subjecting the multi-channel PV input of the inverter to normal MPPT (maximum power point tracking) scanning. By the maximum-power-point global scanning method, the problem that global scanning of multi-channel PV input of an inverter lacks in the prior art is solved, generating capacity is increased and system control logic is reduced.
Description
Technical field
The present invention relates to photovoltaic inversion technical field, more particularly, to a kind of maximum power point whole scan method, inverter
And photovoltaic system.
Background technology
In photovoltaic generating system, in order to solve due to dust, block, each photovoltaic module work(that the reason such as aging leads to
The unmatched problem of rate, being usually each photovoltaic group string increases MPPT (max power point tracking, peak power
Point) scanning, to guarantee that each photovoltaic group string works in maximum power point it is ensured that the output of cell panel is maximum, improves system
Whole efficiency.
Can generate electricity in the case of illumination deficiency to ensure system, prior art generally adopts shown in Fig. 1 simultaneously
Inverter 101, inverter 101 includes multichannel PV array input (PV1 to PVN), and multichannel DC/DC changer 111, DC/AC become
Parallel operation 112, filtration module 113, each DC/DC changer 111 is connected with a road PV array respectively, and every road PV array is by multiple
Photovoltaic group string is in parallel, and each group string is blocked, and aging difference is it is thus possible to have multiple maximum power points it is therefore desirable to seek
Look for multichannel PV to input the maximum power point of each road PV array of inverter, therefore need to increase whole scan, that is, to inverter
Every road PV array carries out full operating voltage range scanning, finds out maximum power point.
Content of the invention
In view of this, the invention provides a kind of maximum power point whole scan method, inverter and photovoltaic system, to solve
The inverter that certainly prior art lacks to the input of multichannel PV carries out the problem of whole scan.
To achieve these goals, technical scheme provided in an embodiment of the present invention is as follows：
A kind of maximum power point whole scan method, is applied to the inverter of multichannel PV input in photovoltaic system, described inverse
Become multichannel DC/DC changer and the controller that device includes being connected respectively with the input of described multichannel PV；Described maximum power point is complete
Office's scan method includes：
Described controller judges whether to need to carry out whole scan；
When needing to carry out whole scan, described controller is processed to the busbar voltage of described inverter；
Described controller is processed to the working condition of described DC/DC changer；
Described controller carries out maximum power point whole scan to the input of described multichannel PV.
Preferably, the step that described controller is processed to the busbar voltage of described inverter includes：
Described controller judges whether the busbar voltage of described inverter is more than preset value；
When the busbar voltage of described inverter is more than preset value, described controller carries out peak power spot scan, until
The busbar voltage of described inverter is less than or equal to described preset value；
When the busbar voltage of described inverter is less than or equal to described preset value, described controller arranges described busbar voltage
Equal to described preset value.
Preferably, the step that described controller is processed to the working condition of described DC/DC changer is：Described control
Device controls the whole described DC/DC changer in described inverter to enter working condition.
Preferably, described preset value is more than line voltage peak value.
Preferably, the step that described controller carries out maximum power point whole scan to the input of described multichannel PV includes：
Described controller individually carries out the maximum power point overall situation to each road input in the input of described multichannel PV respectively and sweeps
Retouch.
Preferably, the step that described controller carries out maximum power point whole scan to the input of described multichannel PV includes：
Described controller needs the input carrying out whole scan to carry out the maximum power point overall situation during described multichannel PV is inputted
Scanning.
Preferably, also include：
After the maximum power point whole scan that the input of described multichannel PV is carried out terminates, described controller is to described multichannel PV
Input carries out peak power spot scan simultaneously.
Preferably, also include：
After the maximum power point whole scan that each road PV input in the input of described multichannel PV is carried out terminates, described control
PV input in Zhi Qiduigai road carries out peak power spot scan.
A kind of inverter, described inverter includes multichannel DC/DC changer and the control being connected respectively with the input of multichannel PV
Device processed；Described controller carries out whole scan using any of the above-described described maximum power point whole scan method.
A kind of photovoltaic system, the inverter in described photovoltaic system includes multichannel DC/ being connected respectively with the input of multichannel PV
DC changer and controller；Described controller carries out the overall situation using any of the above-described described maximum power point whole scan method and sweeps
Retouch.
The application provides a kind of maximum power point whole scan method, it is first determined whether needing to carry out whole scan；When
When needing to carry out whole scan, the busbar voltage of described inverter is carried out judge, maximum power point scanner uni is processed；Then right
The working condition of DC/DC changer is processed；Again maximum power point whole scan is carried out to the input of multichannel PV；To find each
The maximum power point of PV array, after described maximum power point whole scan terminates, then realizes described multichannel PV is just inputted
Often MPPT scanning, solves the problems, such as that the inverter that prior art lacks to the input of multichannel PV carries out whole scan, improves and send out
Electricity, reduces system control logic.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing providing obtains other accompanying drawings.
A kind of photovoltaic generating system schematic diagram that Fig. 1 provides for the embodiment of the present application；
A kind of photovoltaic generating system schematic diagram that Fig. 2 provides for another embodiment of the application；
A kind of maximum power point whole scan method flow diagram that Fig. 3 provides for another embodiment of the application；
A kind of maximum power point whole scan method flow diagram that Fig. 4 provides for another embodiment of the application.
Specific embodiment
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 carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
The invention provides a kind of maximum power point whole scan method, lacked to described multichannel PV with solving prior art
Input carries out the problem of whole scan.
Specifically, as shown in Fig. 2 described maximum power point whole scan method is applied to multichannel PV input in photovoltaic system
The inverter 101 of (PV1 to PVN), inverter 101 includes the multichannel DC/DC conversion being connected respectively with the input of described multichannel PV
Device 111, DC/AC changer 112, filtration module 113 and controller 114；Controller 114 is inputted and many with described multichannel PV respectively
Road DC/DC changer 111 is connected；Described maximum power point whole scan method is as shown in figure 3, include：
S101, controller judge whether to need to carry out whole scan；
After receiving whole scan instruction, then judge now to need to carry out whole scan；Described whole scan instruction can
Think self judgment or random or timing generation instruction, depending on specifically can making its applied environment, do not limit herein.
S102, when needing to carry out whole scan, at busbar voltage Vbus to described inverter for the described controller
Reason；
When multichannel PV in Fig. 2 inputs the situation that there is overtension in PV1 to PVN, then corresponding DC/DC changer
111 are not required to work, thus leading to MPPT scanning to toggle with whole scan needs, lead to logic complicated.It is first right now to need
Busbar voltage Vbus of described inverter 101 carries out judging, maximum power point scanner uni is processed, and is that step S103 is prepared work
Make.
S103, described controller are processed to the working condition of described DC/DC changer；
The working condition that DC/DC changer 111 in Fig. 2 is likely to be at includes：When DC/DC changer 111 is to rise buckling
During parallel operation, its working condition is pressure-increasning state, and when DC/DC changer 111 is buck converter, its working condition is blood pressure lowering shape
State, when system does not need boosting also without blood pressure lowering, DC/DC changer 111 can not enter working condition, does not work.
Controller 114 is processed to the working condition of every road DC/DC changer 111, can avoid because of DC/DC changer
111 toggle between different working conditions, thus avoiding the logical judgment of complexity.
S104, described controller carry out maximum power point whole scan to the input of described multichannel PV.
Maximum power point whole scan is carried out to the input of described multichannel PV, to find the maximum work of each DC/DC changer
Rate point, after described maximum power point whole scan terminates, then realizes the normal MPPT scanning to the input of described multichannel PV, solves
The inverter that prior art lacks to the input of described multichannel PV carries out the problem of whole scan, improves generated energy simultaneously, fall
Low system control logic complexity.
Preferably, as shown in figure 4, described maximum power point whole scan method includes：
S101, described controller judge whether to need to carry out whole scan；
S1021, when needing to carry out whole scan, whether described controller judges busbar voltage Vbus of described inverter
More than preset value；
Preferably, described preset value is more than line voltage peak value.
S1022, when described inverter busbar voltage Vbus be more than preset value when, described controller carries out maximum power point
Scanning, until busbar voltage Vbus of described inverter is less than or equal to described preset value；
When busbar voltage Vbus of described inverter is more than preset value, do not carry out S103 step, but to described inversion
Busbar voltage Vbus of device carries out peak power spot scan, until busbar voltage Vbus of described inverter is less than or equal to described pre-
If value.
S1023, when busbar voltage Vbus of described inverter is less than or equal to described preset value, described controller arranges institute
State busbar voltage Vbus and be equal to described preset value.
When busbar voltage Vbus of described inverter is less than or equal to described preset value, described controller is to described inverter
Busbar voltage Vbus carry out force boosting, arrange described busbar voltage Vbus be equal to described preset value.
S103, described controller are processed to the working condition of described DC/DC changer；
Preferably, described controller controls the whole described DC/DC changer in described inverter to enter working condition.
When busbar voltage Vbus of inverter in described photovoltaic system is less than or equal to described preset value, improve described bus
Voltage Vbus, forces all DC/DC changers to enter corresponding working condition, to reduce the switching for scanning mode for the system.
S104, described controller carry out maximum power point whole scan to the input of described multichannel PV.
Preferably, step S104 includes：
Described controller individually carries out the maximum power point overall situation to each road input in the input of described multichannel PV respectively and sweeps
Retouch.
Specifically, when needing to carry out whole scan, the carrying out that can input a road one tunnel to described multichannel PV respectively is
High-power whole scan, such as carries out whole scan to PV1 first, after the PV1 end of scan, PV2 is scanned, PV2 terminates
After continue follow-up PV input to be scanned, until all PV are scanned.And described controller whole PV input is carried out complete
The order of office's scanning can arbitrarily be arranged, and be not specifically limited, depending on its applied environment herein.
Or, step S104 includes：
Described controller needs the input carrying out whole scan to carry out the maximum power point overall situation during described multichannel PV is inputted
Scanning.
Described controller can also carry out maximum to a certain road in the input of described multichannel PV or a few road PV input respectively
Power points whole scan, then carries out MPPT scanning to other roads PV input.
What deserves to be explained is, when all described multichannel PV input enters whole scan, then described controller reads and owns
The now voltage of MPPT and power signal, keeps voltage to give constant, quickly carries out whole scan；As single channel carries out whole scan
When, then only a road MPPT carries out whole scan, and other carry out normal MPPT scanning.
In addition, it is assumed that there being described in some roads DC/DC changer in parallel, then by be parallel to together be equivalent to a road, then with
In addition way regards independent input as.As defeated with described multichannel PV in assumed to have DC/DC changer as described in 4 tunnels in described inverter
Enter connected, wherein two-way is in parallel, in addition two-way is independent, then two-way in parallel is equivalent to a road, Zai Dui tri- tunnel is independently carried out entirely
Office's scanning.
Preferably, described maximum power point whole scan method also includes：
After the maximum power point whole scan that the input of described multichannel PV is carried out terminates, the input of described multichannel PV is entered simultaneously
Row peak power spot scan.
Consider that the whole scan persistent period is very short, when described maximum power point whole scan method completes above-mentioned steps
Afterwards, make described multichannel PV input carry out peak power spot scan simultaneously, and then reduce power swing and electrical network is impacted.
Preferably, described maximum power point whole scan method also includes：
After the maximum power point whole scan that each road PV input in the input of described multichannel PV is carried out terminates, to this road
PV input carries out peak power spot scan.
As PVi (1<=i<N, after the maximum power point whole scan) carrying out terminates, maximum power point can be carried out immediately and sweep
Retouch, now will increase certain generated energy, be easier to emergent power fluctuation and bus fluctuation；Consider the whole scan persistent period very
Short, after described maximum power point whole scan method completes above-mentioned steps, make described multichannel PV input carry out maximum work simultaneously
Rate spot scan, and then power swing can be reduced and electrical network is impacted；Can certainly mixed processing, do not do concrete limit herein
Fixed.
Another embodiment of the present invention additionally provides a kind of inverter, and described inverter includes inputting phase with multichannel PV respectively
Multichannel DC/DC changer even and controller；Described controller adopts the maximum power point overall situation described in any of the above-described embodiment
Scan method carries out whole scan.
The concrete steps of described maximum power point whole scan method are same as the previously described embodiments, and here is omitted.
Another embodiment of the present invention additionally provides a kind of photovoltaic system, the inverter in described photovoltaic system include respectively with
Multichannel DC/DC changer and controller that the input of multichannel PV is connected；Described controller adopts described in any of the above-described embodiment
High-power whole scan method carries out whole scan.
The concrete steps of described maximum power point whole scan method are same as the previously described embodiments, and here is omitted.
In the present invention, each embodiment is described by the way of going forward one by one, and what each embodiment stressed is real with other
Apply the difference of example, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
Speech, because it corresponds to the method disclosed in Example, so description is fairly simple, referring to method part illustration in place of correlation
?.
The above is only the preferred embodiment of the present invention, making skilled artisans appreciate that or realizing the present invention.Right
Multiple modifications of these embodiments will be apparent to one skilled in the art, as defined herein typically former
Reason can be realized without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention will not
Be intended to be limited to the embodiments shown herein, and be to fit to consistent with principles disclosed herein and features of novelty
Wide scope.
Claims (9)
1. a kind of maximum power point whole scan method is it is characterised in that be applied to the inversion of multichannel PV input in photovoltaic system
Device, described inverter includes multichannel DC/DC changer and the controller being connected respectively with the input of described multichannel PV；Described maximum
Power points whole scan method includes：
Described controller judges whether to need to carry out whole scan；
When needing to carry out whole scan, described controller is processed to the busbar voltage of described inverter；
Described controller is processed to the working condition of described DC/DC changer；
Described controller carries out maximum power point whole scan to the input of described multichannel PV；
The step that described controller is processed to the busbar voltage of described inverter includes：
Described controller judges whether the busbar voltage of described inverter is more than preset value；
When the busbar voltage of described inverter is more than preset value, described controller carries out peak power spot scan, until described
The busbar voltage of inverter is less than or equal to described preset value；
When the busbar voltage of described inverter is less than or equal to described preset value, described controller arranges described busbar voltage and is equal to
Described preset value.
2. maximum power point whole scan method according to claim 1 is it is characterised in that described controller is to described
The step that the working condition of DC/DC changer is processed is：Described controller controls the whole described DC/ in described inverter
DC changer enters working condition.
3. maximum power point whole scan method according to claim 1 is it is characterised in that described preset value is more than electrical network
Voltage peak.
4. maximum power point whole scan method according to claim 1 is it is characterised in that described controller is to described many
The step that PV input in road carries out maximum power point whole scan includes：
Described controller individually carries out maximum power point whole scan to each road input in the input of described multichannel PV respectively.
5. maximum power point whole scan method according to claim 1 is it is characterised in that described controller is to described many
The step that PV input in road carries out maximum power point whole scan includes：
Described controller needs the input carrying out whole scan to carry out maximum power point whole scan during described multichannel PV is inputted.
6. maximum power point whole scan method according to claim 1 is it is characterised in that also include：
After the maximum power point whole scan that the input of described multichannel PV is carried out terminates, described controller inputs to described multichannel PV
Carry out peak power spot scan simultaneously.
7. maximum power point whole scan method according to claim 1 is it is characterised in that in described controller to described
The input of multichannel PV carries out also including while maximum power point whole scan：
After the maximum power point whole scan that the input Zhong mono- road PV input of described multichannel PV is carried out terminates, described controller pair
PV input in this road carries out peak power spot scan.
8. a kind of inverter is it is characterised in that multichannel DC/DC that described inverter includes being connected with the input of multichannel PV respectively becomes
Parallel operation and controller；Described controller is carried out using the arbitrary described maximum power point whole scan method of claim 1 to 7 entirely
Office's scanning.
9. a kind of photovoltaic system is it is characterised in that the inverter in described photovoltaic system includes being connected with the input of multichannel PV respectively
Multichannel DC/DC changer and controller；Described controller adopts the arbitrary described maximum power point overall situation of claim 1 to 7
Scan method carries out whole scan.
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| WO2022133791A1 (en) * | 2020-12-23 | 2022-06-30 | 华为数字能源技术有限公司 | Photovoltaic system and maximum input power determination method |
| CN113178894B (en) * | 2021-06-09 | 2024-04-12 | 阳光电源股份有限公司 | Photovoltaic inverter and MPP scanning control method thereof |
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| JP2003133569A (en) * | 2001-10-30 | 2003-05-09 | Atsushi Iga | Method and apparatus for evaluating output of solar battery in field |
| CN102005777B (en) * | 2010-11-04 | 2013-03-06 | 艾默生网络能源有限公司 | Control method and control system for photovoltaic grid-connected inverter |
| CN102622035B (en) * | 2012-03-21 | 2013-11-13 | 昆兰新能源技术常州有限公司 | Maximum power point tracking control method for photovoltaic inverter |
| JP5988208B2 (en) * | 2012-09-26 | 2016-09-07 | パナソニックＩｐマネジメント株式会社 | Inverter |
| CN104104112B (en) * | 2014-08-08 | 2016-08-24 | 深圳市创皓科技有限公司 | MPPT control method for the photovoltaic combining inverter of two-stage topologies |
| CN104158223B (en) * | 2014-09-01 | 2016-08-24 | 阳光电源股份有限公司 | A kind of control method of grid-connected inverter and system |
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