CN103777672A - Method for recovering output power after curve of photovoltaic cell panel changes sharply - Google Patents
Method for recovering output power after curve of photovoltaic cell panel changes sharply Download PDFInfo
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- CN103777672A CN103777672A CN201410007302.1A CN201410007302A CN103777672A CN 103777672 A CN103777672 A CN 103777672A CN 201410007302 A CN201410007302 A CN 201410007302A CN 103777672 A CN103777672 A CN 103777672A
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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
Abstract
The invention relates to a method for recovering the output power after a curve of a photovoltaic cell panel changes sharply. Due to some abrupt changes of the external environment, some maximum power tracing algorithms cannot operate normally. The method for recovering the output power after the curve of the photovoltaic cell panel changes sharply comprises the steps that the output power of the photovoltaic cell panel is detected; after the detected output power of the photovoltaic cell panel is smaller than the minimum power exiting in the normal operation process, whether the working state at this time is the maximum power tracing state is detected; the current voltage of the photovoltaic cell panel is recorded as a new open-circuit voltage; the open-circuit voltage is used as the starting voltage, the input reference voltage is reduced gradually, and a maximum power tracing method is used for normal operation. By the adoption of the method for recovering the output power after the curve of the photovoltaic cell panel changes sharply, the slow process that the maximum power is found is avoided, a new curve is scanned again directly, the maximum power point of the new curve is found as quickly as possible, more electricity is generated in limited time, and therefore the amount of finally generated electric energy of a photovoltaic system is increased.
Description
Technical field
the invention belongs to grid-connected technical field, relate to the output power restoration methods after the drastic change of a kind of photovoltaic battery panel curve.
Background technology
In photovoltaic parallel in system, the output power of photovoltaic battery panel is controlled (in not exceeding its peak power) by photovoltaic DC-to-AC converter.The voltage of photovoltaic DC-to-AC converter control photovoltaic battery panel, just can control the output power of photovoltaic battery panel, between its power of the output of photovoltaic battery panel and output voltage, have the relation curve shown in Fig. 1, photovoltaic curve is by the characteristic of cell panel and light conditions at that time and temperature conditions is common determines.
In the time that photovoltaic DC-to-AC converter is just being operated in the maximum power point of current curves, because some of external environment condition change suddenly, may cause photovoltaic curve instantaneous variation, as shown in Figure 2, the zero energy point of new curve will be fallen in original like this working point, and like this output power is zero, cause some maximal power tracing algorithms can not normal operation.
Summary of the invention
The object of this invention is to provide the output power restoration methods after the drastic change of a kind of photovoltaic battery panel curve, solve the technical matters that by control inverter, output power is recovered when variation causes output power to be zero suddenly when photovoltaic curve.
For solving the problems of the technologies described above, technical scheme of the present invention is: the output power restoration methods after the drastic change of photovoltaic battery panel curve, and its special feature is: comprise the following steps:
Step 1: detect the output power of photovoltaic battery panel: the minimum power that whether output power that detects photovoltaic battery panel is less than photovoltaic battery panel while normally moving, minimum power when photovoltaic battery panel normally moves is 1/40th to 1/50th of its rated power, if the minimum power when being less than photovoltaic battery panel and normally moving, proceed to step 2, if be greater than the minimum power of normal operation, continue to detect;
Step 2: the photovoltaic battery panel output power detecting is less than after the minimum power of normal operation, more whether the duty detecting is now maximal power tracing state:
If maximal power tracing state proceeds to step 3; If not maximal power tracing state, continue to detect;
Step 3: recording current photovoltaic battery panel voltage is new open-circuit voltage; The photovoltaic battery panel voltage that is about to now sample is decided to be open-circuit voltage, namely the maximum output voltage of the second curve now;
Step 4: start with open-circuit voltage, the reference voltage of input progressively reduced, one of percentage that the reference voltage that every step reduces is open-circuit voltage, until be reduced to open-circuit voltage 70% after stop;
Step 5: use a kind of method of maximal power tracing to work normally: make its dynamic maximum power point of following the tracks of photovoltaic curve.
Compared with prior art, the present invention has following beneficial effect: the present invention can cause due to the external world after photovoltaic curvilinear motion after power bust, avoid finding slowly the process of peak power, but directly from newly starting to scan new curve, find as early as possible new curve maximum power point, within the limited time, send more electricity, the final generated energy of photovoltaic system is improved.
Accompanying drawing explanation
Fig. 1 is output power and the voltage response schematic diagram of photovoltaic battery panel;
Fig. 2 is that external environment condition changes the schematic diagram that causes photovoltaic curvilinear motion;
Fig. 3 is method flow diagram of the present invention.
Wherein: 1. the first curve; 2. the second curve.
Embodiment
Below in conjunction with embodiment, the present invention will be described in detail.
Referring to Fig. 2, when normal, invertor operation is at the A of the first curve 1 point, and, near maximum power point, now the output voltage of photovoltaic battery panel is maximum power point voltage.
In the time that photovoltaic battery panel curve changes to the second curve 2 suddenly, because the quiescent potential of eve is greater than the open-circuit voltage of the second curve 2, so new working point can move to the open-circuit voltage point of the second curve 2 at once, it is B point, record voltage is now the open-circuit voltage of the second curve 2, then progressively reduce successively the input reference voltage of inverter, referring to Fig. 3, concrete grammar step is as follows:
Step 1: detect the output power of photovoltaic battery panel: the minimum power that whether output power that detects photovoltaic battery panel is less than photovoltaic battery panel while normally moving, minimum power when photovoltaic battery panel normally moves is 1/40th to 1/50th of its rated power, if the minimum power when being less than photovoltaic battery panel and normally moving, proceed to step 2, if be greater than the minimum power of normal operation, continue to detect;
Step 2: the photovoltaic battery panel output power detecting is less than after the minimum power of normal operation, more whether the duty detecting is now maximal power tracing state:
If maximal power tracing state illustrates that likely the second curve 2 has suddenlyd change, otherwise power in the time that peak power is moved can not be so little, proceeds to step 3; If not maximal power tracing state, continue to detect; If maximal power tracing state illustrates that the second curve 2 may suddenly change, otherwise power in the time that peak power is moved can not be so little;
Step 3: recording current photovoltaic battery panel voltage is new open-circuit voltage; The photovoltaic battery panel voltage that is about to now sample is decided to be open-circuit voltage, namely the maximum output voltage of the second curve 2 now;
Step 4: start with open-circuit voltage, the reference voltage of input progressively reduced, one of percentage that the reference voltage that every step reduces is open-circuit voltage, until be reduced to open-circuit voltage 70% after stop;
Step 5: use a kind of method of maximal power tracing to work normally: make its dynamic maximum power point of following the tracks of photovoltaic curve, conventionally adopt disturbance observation to work normally.
Claims (1)
1. the output power restoration methods after the drastic change of photovoltaic battery panel curve, is characterized in that: comprise the following steps:
Step 1: detect the output power of photovoltaic battery panel: the minimum power that whether output power that detects photovoltaic battery panel is less than photovoltaic battery panel while normally moving, minimum power when photovoltaic battery panel normally moves is 1/40th to 1/50th of its rated power, if the minimum power when being less than photovoltaic battery panel and normally moving, proceed to step 2, if be greater than the minimum power of normal operation, continue to detect;
Step 2: the photovoltaic battery panel output power detecting is less than after the minimum power of normal operation, more whether the duty detecting is now maximal power tracing state:
If maximal power tracing state proceeds to step 3; If not maximal power tracing state, continue to detect;
Step 3: recording current photovoltaic battery panel voltage is new open-circuit voltage; The photovoltaic battery panel voltage that is about to now sample is decided to be open-circuit voltage, namely the maximum output voltage of the second curve (2) now;
Step 4: start with open-circuit voltage, the reference voltage of input progressively reduced, one of percentage that the reference voltage that every step reduces is open-circuit voltage, until be reduced to open-circuit voltage 70% after stop;
Step 5: use a kind of method of maximal power tracing to work normally: make its dynamic maximum power point of following the tracks of photovoltaic curve.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106712716A (en) * | 2017-02-10 | 2017-05-24 | 阳光电源股份有限公司 | IV curve scanning method of photovoltaic module and optimizer |
| CN108039868A (en) * | 2017-12-21 | 2018-05-15 | 河南理工大学 | Solar electric power supply system detection method and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106712716A (en) * | 2017-02-10 | 2017-05-24 | 阳光电源股份有限公司 | IV curve scanning method of photovoltaic module and optimizer |
| CN106712716B (en) * | 2017-02-10 | 2019-02-01 | 阳光电源股份有限公司 | A kind of the IV curved scanning method and optimizer of photovoltaic module |
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| CN108039868A (en) * | 2017-12-21 | 2018-05-15 | 河南理工大学 | Solar electric power supply system detection method and device |
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Address after: 710021 export processing zone, No. twelve, No. 1, Xi'an economic and Technological Development Zone, Xi'an, Shaanxi, Fengcheng Co-patentee after: Xi'an Longfei Electric Technology Co.,Ltd. Patentee after: Longteng Semiconductor Co.,Ltd. Address before: 710021 export processing zone, No. twelve, No. 1, Xi'an economic and Technological Development Zone, Xi'an, Shaanxi, Fengcheng Co-patentee before: Xi'an Longfei Electric Technology Co.,Ltd. Patentee before: LONTEN SEMICONDUCTOR Co.,Ltd. Address after: 710021 export processing zone, No. twelve, No. 1, Xi'an economic and Technological Development Zone, Xi'an, Shaanxi, Fengcheng Co-patentee after: Xi'an Longfei Electric Technology Co.,Ltd. Patentee after: LONTEN SEMICONDUCTOR Co.,Ltd. Address before: 710021 export processing zone, No. twelve, No. 1, Xi'an economic and Technological Development Zone, Xi'an, Shaanxi, Fengcheng Co-patentee before: Shaanxi Longfei Amperex Technology Ltd. Patentee before: XI'AN LONTEN RENEWABLE ENERGY TECHNOLOGY Inc. |
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