CN103777672B - Output power restoration methods after the drastic change of photovoltaic battery panel curve - Google Patents
Output power restoration methods after the drastic change of photovoltaic battery panel curve Download PDFInfo
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- CN103777672B CN103777672B CN201410007302.1A CN201410007302A CN103777672B CN 103777672 B CN103777672 B CN 103777672B CN 201410007302 A CN201410007302 A CN 201410007302A CN 103777672 B CN103777672 B CN 103777672B
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The present invention relates to the output power restoration methods after the drastic change of a kind of photovoltaic battery panel curve.Because some of external environment condition change suddenly, cause some maximal power tracing algorithms can not normal operation.Output power restoration methods after the drastic change of photovoltaic battery panel curve, comprises the following steps: the output power detecting photovoltaic battery panel; After the photovoltaic battery panel output power detected is less than the normal minimum power run, more whether the duty detected now is maximal power tracing state: recording current photovoltaic battery panel voltage is new open-circuit voltage; Start with open-circuit voltage, the reference voltage of input is progressively reduced, use a kind of method of maximal power tracing to work normally.The present invention avoids the process finding peak power slowly, directly from newly, scans new curve, finds new curve maximum power point as early as possible, within the limited time, sends more electricity, and the generated energy making photovoltaic system final improves.
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 (when not exceeding its peak power) by photovoltaic DC-to-AC converter.Photovoltaic DC-to-AC converter controls the voltage of photovoltaic battery panel, just can control the output power of photovoltaic battery panel, have the relation curve shown in Fig. 1 between the output of photovoltaic battery panel its power and output voltage, photovoltaic curve is jointly determined by the characteristic of cell panel and light conditions at that time and temperature conditions.
When 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, photovoltaic curve instantaneous variation may be caused, as shown in Figure 2, the zero energy point of new curve will be fallen in working point original like this, 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 and make output power carry out the technical matters recovered when photovoltaic curve changes suddenly and causes output power to be zero by control inverter.
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 one: the output power detecting photovoltaic battery panel: whether the output power of detection photovoltaic battery panel is less than minimum power when photovoltaic battery panel normally runs, minimum power when photovoltaic battery panel normally runs is 1 to five/40th 1/10th of its rated power, if be less than minimum power when photovoltaic battery panel normally runs, then proceed to step 2, if be greater than the normal minimum power run, then continue to detect;
Step 2: after the photovoltaic battery panel output power detected is less than the normal minimum power run, more whether the duty detected now is maximal power tracing state:
If maximal power tracing state, then proceed to step 3; If not maximal power tracing state, then continue to detect;
Step 3: recording current photovoltaic battery panel voltage is new open-circuit voltage; The photovoltaic battery panel voltage being about to now sample is decided to be open-circuit voltage, namely the maximum output voltage of now the second curve;
Step 4: start with open-circuit voltage, progressively reduces the reference voltage of input, and the reference voltage often walking reduction is one of percentage of open-circuit voltage, until stop after being reduced to 70% of open-circuit voltage;
Step 5: use a kind of method of maximal power tracing to work normally: make it follow the tracks of the maximum power point of photovoltaic curve dynamically.
Compared with prior art, the present invention has following beneficial effect: the present invention can after causing photovoltaic curvilinear motion due to the external world after power bust, avoid the process finding peak power slowly, but directly from newly, scan new curve, find new curve maximum power point as early as possible, within the limited time, send more electricity, the generated energy making photovoltaic system final improves.
Accompanying drawing explanation
Fig. 1 is output power and the voltage response schematic diagram of photovoltaic battery panel;
Fig. 2 is the schematic diagram that external environment condition change 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.
See Fig. 2, time normal, invertor operation is at the A point of the first curve 1, and namely near maximum power point, now the output voltage of photovoltaic battery panel is maximum power point voltage.
When photovoltaic battery panel curve changes to suddenly the second curve 2, quiescent potential due to 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, i.e. B point, record voltage is now the open-circuit voltage of the second curve 2, then progressively reduce the input reference voltage of inverter successively, see Fig. 3, concrete grammar step is as follows:
Step one: the output power detecting photovoltaic battery panel: whether the output power of detection photovoltaic battery panel is less than minimum power when photovoltaic battery panel normally runs, minimum power when photovoltaic battery panel normally runs is 1 to five/40th 1/10th of its rated power, if be less than minimum power when photovoltaic battery panel normally runs, then proceed to step 2, if be greater than the normal minimum power run, then continue to detect;
Step 2: after the photovoltaic battery panel output power detected is less than the normal minimum power run, more whether the duty detected now is maximal power tracing state:
If maximal power tracing state, illustrate that likely the second curve 2 has suddenlyd change, otherwise the power when peak power is run can not be so little, then proceed to step 3; If not maximal power tracing state, then continue to detect; If maximal power tracing state, illustrate that the second curve 2 may suddenly change, otherwise the power when peak power is run can not be so little;
Step 3: recording current photovoltaic battery panel voltage is new open-circuit voltage; The photovoltaic battery panel voltage being about to now sample is decided to be open-circuit voltage, namely the maximum output voltage of now the second curve 2;
Step 4: start with open-circuit voltage, progressively reduces the reference voltage of input, and the reference voltage often walking reduction is one of percentage of open-circuit voltage, until stop after being reduced to 70% of open-circuit voltage;
Step 5: use a kind of method of maximal power tracing to work normally: make it follow the tracks of the maximum power point of photovoltaic curve dynamically, usually 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 one: the output power detecting photovoltaic battery panel: whether the output power of detection photovoltaic battery panel is less than minimum power when photovoltaic battery panel normally runs, minimum power when photovoltaic battery panel normally runs is 1 to five/40th 1/10th of its rated power, if be less than minimum power when photovoltaic battery panel normally runs, then proceed to step 2, if be greater than the normal minimum power run, then whether the output power of continuation detection photovoltaic battery panel is less than minimum power when photovoltaic battery panel normally runs;
Step 2: after the photovoltaic battery panel output power detected is less than the normal minimum power run, more whether the duty detected now is maximal power tracing state:
If maximal power tracing state, then proceed to step 3; If not maximal power tracing state, then continue whether the duty detected now is maximal power tracing state;
Step 3: recording current photovoltaic battery panel voltage is new open-circuit voltage; The photovoltaic battery panel voltage being about to now sample is decided to be open-circuit voltage, namely the maximum output voltage of now the second curve (2);
Step 4: start with open-circuit voltage, progressively reduces the reference voltage of input, and the reference voltage often walking reduction is one of percentage of open-circuit voltage, until stop after being reduced to 70% of open-circuit voltage;
Step 5: use a kind of method of maximal power tracing to work normally: make it follow the tracks of the maximum power point of photovoltaic curve dynamically.
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| 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 |
| 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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| US5869956A (en) * | 1996-09-06 | 1999-02-09 | Canon Kabushiki Kaisha | Solar power generation apparatus and power control device therefor |
| CN101877559A (en) * | 2010-06-29 | 2010-11-03 | 苏州市职业大学 | Compound control method for fast and accurate tracking control of maximum power point of photovoltaic power generation system |
| CN102354247A (en) * | 2010-05-28 | 2012-02-15 | Nxp股份有限公司 | Maximum power point tracking method, photovoltaic system controller and photovoltaic system |
| CN102624285A (en) * | 2012-03-23 | 2012-08-01 | 浙江工业大学 | Control method for maximum power point tracking (MPPT) of photovoltaic array |
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| JP4895686B2 (en) * | 2006-05-29 | 2012-03-14 | 三菱電機株式会社 | Solar power system |
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| US5869956A (en) * | 1996-09-06 | 1999-02-09 | Canon Kabushiki Kaisha | Solar power generation apparatus and power control device therefor |
| CN102354247A (en) * | 2010-05-28 | 2012-02-15 | Nxp股份有限公司 | Maximum power point tracking method, photovoltaic system controller and photovoltaic system |
| CN101877559A (en) * | 2010-06-29 | 2010-11-03 | 苏州市职业大学 | Compound control method for fast and accurate tracking control of maximum power point of photovoltaic power generation system |
| CN102624285A (en) * | 2012-03-23 | 2012-08-01 | 浙江工业大学 | Control method for maximum power point tracking (MPPT) of photovoltaic array |
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Effective date of registration: 20170523 Address after: 710021 export processing zone, No. twelve, No. 1, Xi'an economic and Technological Development Zone, Xi'an, Shaanxi, Fengcheng Co-patentee after: Shaanxi Longfei Amperex Technology Ltd. Patentee after: XI'AN LONTEN RENEWABLE ENERGY TECHNOLOGY Inc. Address before: 710021 Xi'an Province, Fengcheng, No. twelve Road, No. 1 export processing zone, No. Patentee before: Xi'an Lonten Renewable Energy Technology Inc. |
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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. |