CN104460818A - 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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- CN104460818A CN104460818A CN201410765809.3A CN201410765809A CN104460818A CN 104460818 A CN104460818 A CN 104460818A CN 201410765809 A CN201410765809 A CN 201410765809A CN 104460818 A CN104460818 A CN 104460818A
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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, particularly relate 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, the unmatched problem of each photovoltaic module power that the reason such as aging causes, be generally each photovoltaic group string and increase MPPT (max powerpoint tracking, maximum power point) scanning, to guarantee that each photovoltaic group string works in maximum power point, ensure that the output power of cell panel is maximum, improve entire system efficiency.
Simultaneously in order to ensure that system can generate electricity when illumination deficiency, prior art adopts the inverter 101 shown in Fig. 1 usually, inverter 101 comprises multichannel PV array input (PV1 to PVN), multichannel DC/DC transducer 111, DC/AC transducer 112, filtration module 113, each DC/DC transducer 111 is connected with a road PV array respectively, and every road PV array is by multiple photovoltaic group connection in series-parallel, each group of string is blocked, aging difference, therefore multiple maximum power point may be there is, therefore need to find the maximum power point that multichannel PV inputs each road PV array of inverter, therefore need to increase whole scan, namely full operating voltage range scanning is carried out to every road PV array of inverter, find out maximum power point.
Summary of the invention
In view of this, the invention provides a kind of maximum power point whole scan method, inverter and photovoltaic system, lack the problem of the inverter of multichannel PV input being carried out to whole scan to solve prior art.
To achieve these goals, the technical scheme that provides of the embodiment of the present invention is as follows:
A kind of maximum power point whole scan method, be applied to the inverter of multichannel PV input in photovoltaic system, described inverter comprises the multichannel DC/DC transducer and controller that input with described multichannel PV respectively and be connected; Described maximum power point whole scan method comprises:
Described controller judges whether to need to carry out whole scan;
When needs carry out whole scan, the busbar voltage of described controller to described inverter processes;
The duty of described controller to described DC/DC transducer processes;
Described controller carries out maximum power point whole scan to described multichannel PV input.
Preferably, the step that the busbar voltage of described controller to described inverter processes comprises:
Described controller judges whether the busbar voltage of described inverter is greater than preset value;
When the busbar voltage of described inverter is greater 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 and equals described preset value.
Preferably, the step that the duty of described controller to described DC/DC transducer processes is: the whole described DC/DC transducer that described controller controls in described inverter enters duty.
Preferably, described preset value is greater than line voltage peak value.
Preferably, described controller comprises the step that maximum power point whole scan is carried out in described multichannel PV input:
Described controller carries out maximum power point whole scan separately to each road input in described multichannel PV input respectively.
Preferably, described controller comprises the step that maximum power point whole scan is carried out in described multichannel PV input:
Described controller needs the input carrying out whole scan to carry out maximum power point whole scan in described multichannel PV input.
Preferably, also comprise:
Input after the maximum power point whole scan carried out terminates to described multichannel PV, described controller carries out peak power spot scan to described multichannel PV input simultaneously.
Preferably, also comprise:
Input after the maximum power point whole scan carried out terminates to each road PV in described multichannel PV input, described controller inputs this road PV and carries out peak power spot scan.
A kind of inverter, described inverter comprises the multichannel DC/DC transducer and controller that input with multichannel PV respectively and be connected; Described controller adopts above-mentioned arbitrary described maximum power point whole scan method to carry out whole scan.
A kind of photovoltaic system, the inverter in described photovoltaic system comprises the multichannel DC/DC transducer and controller that input with multichannel PV respectively and be connected; Described controller adopts above-mentioned arbitrary described maximum power point whole scan method to carry out whole scan.
The application provides a kind of maximum power point whole scan method, first judges whether to need to carry out whole scan; When needs carry out whole scan, the busbar voltage of described inverter to be judged, the process of maximum power point scanner uni; Then the duty of DC/DC transducer is processed; Again maximum power point whole scan is carried out to multichannel PV input; To find the maximum power point of each PV array, after described maximum power point whole scan terminates, realize the normal MPPT scanning to described multichannel PV input again, solve prior art and lack the problem of the inverter of multichannel PV input being carried out to whole scan, improve generated energy, reduce system control logic.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
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.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides a kind of maximum power point whole scan method, lack the problem of described multichannel PV input being carried out to whole scan to solve prior art.
Concrete, as shown in Figure 2, described maximum power point whole scan method is applied to the inverter 101 of multichannel PV input (PV1 to PVN) in photovoltaic system, and inverter 101 comprises the multichannel DC/DC transducer 111, DC/AC transducer 112, filtration module 113 and the controller 114 that input with described multichannel PV respectively and be connected; Controller 114 inputs with described multichannel PV respectively and multichannel DC/DC transducer 111 is connected; Described maximum power point whole scan method as shown in Figure 3, comprising:
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 be self judgment or instruction that is random or timing generation, specifically can make its applied environment and determine, not limiting herein.
S102, when needs carry out whole scan, described controller is to the busbar voltage Vbus process of described inverter;
When there is the situation of overtension in the multichannel PV input PV1 to PVN in Fig. 2, then corresponding DC/DC transducer 111 does not need work, thus causes MPPT scanning to need to switch back and forth with whole scan, causes logic complicated.Now need first to judge the busbar voltage Vbus of described inverter 101, the process of maximum power point scanner uni, for step S103 does homework.
S103, the described controller duty to described DC/DC transducer processes;
The duty that DC/DC transducer 111 in Fig. 2 may be in comprises: when DC/DC transducer 111 is for booster converter, its duty is pressure-increasning state, when DC/DC transducer 111 is buck converter, its duty is step-down state, when system does not need boosting not need step-down yet, DC/DC transducer 111 can not enter duty, does not namely work.
The duty of controller 114 to every road DC/DC transducer 111 processes, and can avoid because DC/DC transducer 111 switches back and forth between different duties, thus avoids complicated Logic judgment.
S104, described controller carry out maximum power point whole scan to described multichannel PV input.
Maximum power point whole scan is carried out to described multichannel PV input, to find the maximum power point of each DC/DC transducer, after described maximum power point whole scan terminates, realize the normal MPPT scanning to described multichannel PV input again, solve prior art and lack the problem of the inverter of described multichannel PV input being carried out to whole scan, improve generated energy simultaneously, reduce system control logic complexity.
Preferably, as shown in Figure 4, described maximum power point whole scan method comprises:
S101, described controller judge whether to need to carry out whole scan;
S1021, when needs carry out whole scan, described controller judges whether the busbar voltage Vbus of described inverter is greater than preset value;
Preferably, described preset value is greater than line voltage peak value.
S1022, when the busbar voltage Vbus of described inverter is greater than preset value, described controller carries out peak power spot scan, until the busbar voltage Vbus of described inverter is less than or equal to described preset value;
When the busbar voltage Vbus of described inverter is greater than preset value, do not carry out S103 step, but peak power spot scan is carried out to the busbar voltage Vbus of described inverter, until the busbar voltage Vbus of described inverter is less than or equal to described preset value.
S1023, when the busbar voltage Vbus of described inverter is less than or equal to described preset value, described controller arranges described busbar voltage Vbus and equals described preset value.
When the busbar voltage Vbus of described inverter is less than or equal to described preset value, described controller carries out pressure boosting to the busbar voltage Vbus of described inverter, arranges described busbar voltage Vbus and equals described preset value.
S103, the described controller duty to described DC/DC transducer processes;
Preferably, the whole described DC/DC transducer that described controller controls in described inverter enters duty.
When the busbar voltage Vbus of inverter is less than or equal to described preset value in described photovoltaic system, improve described busbar voltage Vbus, force all DC/DC transducers to enter corresponding duty, to reduce the switching of system for scanning mode.
S104, described controller carry out maximum power point whole scan to described multichannel PV input.
Preferably, step S104 comprises:
Described controller carries out maximum power point whole scan separately to each road input in described multichannel PV input respectively.
Concrete, when needs carry out whole scan, what can input road one tunnel to described multichannel PV respectively carries out maximum power point whole scan, as first carried out whole scan to PV1, when scanning PV2 after the PV1 end of scan, PV2 terminates rear continuation and scans, until all PV are scanned follow-up PV input.And described controller can be arranged arbitrarily the order that whole scan is carried out in whole PV input, is not specifically limited, depending on its applied environment herein.
Or step S104 comprises:
Described controller needs the input carrying out whole scan to carry out maximum power point whole scan in described multichannel PV input.
Described controller also can carry out maximum power point whole scan to a certain road in described multichannel PV input or a few road PV input respectively, then carries out MPPT scanning to other roads PV input.
What deserves to be explained is, when whole described multichannel PV input enters whole scan, then described controller reads voltage and the power signal of all now MPPT, keeps voltage given constant, carries out whole scan fast; As single channel carry out whole scan time, then only a road MPPT carries out whole scan, and other carry out normal MPPT scanning.
In addition, to suppose to have described in some road DC/DC transducer in parallel, then by be parallel to together be equivalent to a road, then regard as with other way and independently input.As have in inverter as described in supposing DC/DC transducer as described in 4 tunnels with as described in multichannel PV input and be connected, wherein two-way is in parallel, and two-way is independent in addition, then the two-way of parallel connection is equivalent to a road, Zai Dui tri-independently carries out whole scan in tunnel.
Preferably, described maximum power point whole scan method also comprises:
Input after the maximum power point whole scan carried out terminates to described multichannel PV, peak power spot scan is carried out to described multichannel PV input simultaneously.
Consider that the whole scan duration is very short, after described maximum power point whole scan method completes above-mentioned steps, described multichannel PV is inputted and carries 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 comprises:
Input after the maximum power point whole scan carried out terminates to each road PV in described multichannel PV input, this road PV is inputted and carries out peak power spot scan.
After the maximum power point whole scan carried out as PVi (1<=i<N) terminates, peak power spot scan can be carried out immediately, now will increase certain generated energy, easier emergent power fluctuation and bus fluctuation; Consider that the whole scan duration is very short, after described maximum power point whole scan method completes above-mentioned steps, described multichannel PV is inputted and carries out peak power spot scan simultaneously, and then power swing can be reduced and electrical network is impacted; Can certainly hybrid processing, be not specifically limited herein.
Another embodiment of the present invention additionally provides a kind of inverter, and described inverter comprises the multichannel DC/DC transducer and controller that input with multichannel PV respectively and be connected; Described controller adopts the maximum power point whole scan method described in above-mentioned any embodiment to carry out whole scan.
The concrete steps of described maximum power point whole scan method are same as the previously described embodiments, repeat no more herein.
Another embodiment of the present invention additionally provides a kind of photovoltaic system, and the inverter in described photovoltaic system comprises the multichannel DC/DC transducer and controller that input with multichannel PV respectively and be connected; Described controller adopts the maximum power point whole scan method described in above-mentioned any embodiment to carry out whole scan.
The concrete steps of described maximum power point whole scan method are same as the previously described embodiments, repeat no more herein.
In the present invention, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For device disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.
Below be only the preferred embodiment of the present invention, those skilled in the art understood or realizes the present invention.To be apparent to one skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a maximum power point whole scan method, is characterized in that, be applied to the inverter of multichannel PV input in photovoltaic system, described inverter comprises the multichannel DC/DC transducer and controller that input with described multichannel PV respectively and be connected; Described maximum power point whole scan method comprises:
Described controller judges whether to need to carry out whole scan;
When needs carry out whole scan, the busbar voltage of described controller to described inverter processes;
The duty of described controller to described DC/DC transducer processes;
Described controller carries out maximum power point whole scan to described multichannel PV input.
2. maximum power point whole scan method according to claim 1, is characterized in that, the step that the busbar voltage of described controller to described inverter processes comprises:
Described controller judges whether the busbar voltage of described inverter is greater than preset value;
When the busbar voltage of described inverter is greater 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 and equals described preset value.
3. maximum power point whole scan method according to claim 1, it is characterized in that, the step that the duty of described controller to described DC/DC transducer processes is: the whole described DC/DC transducer that described controller controls in described inverter enters duty.
4. maximum power point whole scan method according to claim 2, it is characterized in that, described preset value is greater than line voltage peak value.
5. maximum power point whole scan method according to claim 1, is characterized in that, described controller comprises the step that maximum power point whole scan is carried out in described multichannel PV input:
Described controller carries out maximum power point whole scan separately to each road input in described multichannel PV input respectively.
6. maximum power point whole scan method according to claim 1, is characterized in that, described controller comprises the step that maximum power point whole scan is carried out in described multichannel PV input:
Described controller needs the input carrying out whole scan to carry out maximum power point whole scan in described multichannel PV input.
7. maximum power point whole scan method according to claim 1, is characterized in that, also comprise:
Input after the maximum power point whole scan carried out terminates to described multichannel PV, described controller carries out peak power spot scan to described multichannel PV input simultaneously.
8. maximum power point whole scan method according to claim 1, is characterized in that, also comprise:
Input after the maximum power point whole scan carried out terminates to each road PV in described multichannel PV input, described controller inputs this road PV and carries out peak power spot scan.
9. an inverter, is characterized in that, described inverter comprises the multichannel DC/DC transducer and controller that input with multichannel PV respectively and be connected; Described controller adopts the arbitrary described maximum power point whole scan method of claim 1 to 8 to carry out whole scan.
10. a photovoltaic system, is characterized in that, the inverter in described photovoltaic system comprises the multichannel DC/DC transducer and controller that input with multichannel PV respectively and be connected; Described controller adopts the arbitrary described maximum power point whole scan method of claim 1 to 8 to carry 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 |
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