CN103425174A - Self-adaptive multimodal photovoltaic maximum power tracing device and method - Google Patents
Self-adaptive multimodal photovoltaic maximum power tracing device and method Download PDFInfo
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- CN103425174A CN103425174A CN2013103201173A CN201310320117A CN103425174A CN 103425174 A CN103425174 A CN 103425174A CN 2013103201173 A CN2013103201173 A CN 2013103201173A CN 201310320117 A CN201310320117 A CN 201310320117A CN 103425174 A CN103425174 A CN 103425174A
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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 invention belongs to the field of photovoltaic inverters, and particularly relates to a tracing device and method for tracing and monitoring a solar cell. The device comprises an inverter connected with a power grid, a plurality of current sampling units and a direct voltage sampling unit, wherein the current sampling units are used for detecting output currents of input square matrixes and are in parallel connection with the inverter, and the direct voltage sampling unit conducts sampling on the direct current end voltages of the inverter. The direct voltage sampling unit and the current sampling units feed sampling values back to a power computing unit, the power computing unit computes and obtains the power value of each input matrix according to the sampling values and transmits the power value to a multimodal identification judging device, the multimodal identification judging device obtains the maximum voltage value corresponding to multimodal according to power values, the multimodal identification judging device is connected with a comparator, the comparator enables the maximum voltage of the multimodal identification judging device to be compared with the sampling voltage of the direct voltage sampling unit, a compared result is fed back to an inverter adjuster by the comparator, and the inverter adjuster is connected with the inverter.
Description
Technical field
The invention belongs to the photovoltaic DC-to-AC converter field, particularly a kind of partial power to solar cell power generation maximum point carries out tracking means and the method for tracking and monitoring
Background technology
In the MW class photovoltaic generating system, for MW level photovoltaic DC-to-AC converter, it is operated in high voltage, under large current condition, there is higher noise circumstance, input electric battery string is very huge, although photovoltaic cell is same type, if but by the error in manufacturing process and produce aging problem along with the time and take into account, may there be the difference of elevation angle for different cell panels in this when placing, therefore the performance of each battery can not be definitely consistent, add in use procedure, the battery crackle may occur or not mate, inner Joint failure, part is blocked or the situation such as make dirty, cause some photovoltaic cell or array characteristic and overall permanence inharmonious, the local maximum power point of array may appear, under many group string array input conditions, local maximum power point multimodal problem is more complicated, if adopt the characteristic MPPT algorithm of photovoltaic P-V based on unimodal value form possibly can't accurately search maximum power point.
Summary of the invention
The present invention is directed to the problem that prior art exists, the present invention can be according to the photovoltaic battery array characteristic, can input the square formation maximum power point to each and carry out independent identification, and learn the maximum power point of the system that traces into fast by calculating, overcome the multimodal complex effects, guaranteed that photovoltaic generating system has good dynamic perfromance and steady state controling precision.
The present invention is achieved through the following technical solutions:
Self-adaptation multimodal photovoltaic maximum power tracking device and method, it is characterized in that: comprise the inverter be connected with electrical network, and a plurality of current sampling units that the output current of input square formation is detected, a plurality of current sampling units and inverter parallel, also comprise the DC voltage sampling unit that the inverter DC terminal voltage is sampled, described DC voltage sampling unit and current sampling unit all feed back to power calculation unit by sampled value, the performance number that power calculation unit calculates each input square formation according to sampled value passes to multimodal identification decision device, multimodal identification decision device obtains maximum voltage value corresponding to multimodal according to performance number, multimodal identification decision device is connected with comparer, comparer compares the sampled voltage of the maximum voltage of multimodal identification decision device and DC voltage sampling unit, comparer by result feedback relatively to the inverter regulator, the inverter regulator is connected with inverter.
The present invention has following technique effect: the present invention is by carrying out independent identification to each solar cell input square formation maximum power point, and the method for identifying by multimodal is followed the tracks of the maximum power point of solar cell input square formation, overcome the multimodal complex effects, made solar power system there is good dynamic perfromance and steady state controling precision.
The accompanying drawing explanation
Fig. 1 is system chart of the present invention;
In figure, 1 is multimodal identification decision device, and 2 is power calculation unit, and 3 is the input square formation, and 4 is current sampling unit, and 5 is the DC voltage sampling unit, and 6 is inverter, and 7 is electrical network, and 8 is the inverter regulator, and 9 is comparer.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
Self-adaptation multimodal photovoltaic maximum power tracking device and method as shown in Figure 1, it is characterized in that: comprise the inverter 6 be connected with electrical network, and a plurality of current sampling units 4 that the output current of input square formation 3 is detected, a plurality of current sampling units 4 are in parallel with inverter 6, also comprise the DC voltage sampling unit 5 that inverter 6 DC terminal voltages are sampled, described DC voltage sampling unit 5 all feeds back to sampled value power calculation unit 2 with current sampling unit 4, the performance number that power calculation unit 2 calculates each input square formation according to sampled value passes to multimodal identification decision device 1, multimodal identification decision device 1 obtains maximum voltage value corresponding to multimodal according to performance number, multimodal identification decision device 1 is connected with comparer 9, comparer 9 compares the sampled voltage of the maximum voltage of multimodal identification decision device and DC voltage sampling unit, comparer 9 by result feedback relatively to inverter regulator 8, inverter regulator 8 is connected with inverter 6.
The present invention has following technique effect: the present invention is by carrying out independent identification to each solar cell input square formation maximum power point, and the method for identifying by multimodal is followed the tracks of the maximum power point of solar cell input square formation, overcome the multimodal complex effects, made solar power system there is good dynamic perfromance and steady state controling precision.
Claims (1)
1. self-adaptation multimodal photovoltaic maximum power tracking device and method, it is characterized in that: comprise the inverter be connected with electrical network, and a plurality of current sampling units that the output current of input square formation is detected, a plurality of current sampling units and inverter parallel, also comprise the DC voltage sampling unit that the inverter DC terminal voltage is sampled, described DC voltage sampling unit and current sampling unit all feed back to power calculation unit by sampled value, the performance number that power calculation unit calculates each input square formation according to sampled value passes to multimodal identification decision device, multimodal identification decision device obtains maximum voltage value corresponding to multimodal according to performance number, multimodal identification decision device is connected with comparer, comparer compares the sampled voltage of the maximum voltage of multimodal identification decision device and DC voltage sampling unit, comparer by result feedback relatively to the inverter regulator, the inverter regulator is connected with inverter.
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| CN2013103201173A CN103425174A (en) | 2013-07-29 | 2013-07-29 | Self-adaptive multimodal photovoltaic maximum power tracing device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280629A (en) * | 2014-08-07 | 2015-01-14 | 深圳市汇川技术股份有限公司 | Method and system for evaluating maximum power point tracing efficiency of photovoltaic inverter |
| CN106062654A (en) * | 2014-02-27 | 2016-10-26 | 松下知识产权经营株式会社 | Power controller and power conditioner |
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| US5682305A (en) * | 1993-11-16 | 1997-10-28 | Canon Kabushiki Kaisha | Method and apparatus for controlling the power of a battery power source |
| JP2001060119A (en) * | 1999-08-20 | 2001-03-06 | Matsushita Electric Works Ltd | Maximum power control method for solar battery |
| CN102870310A (en) * | 2010-04-26 | 2013-01-09 | 金斯顿女王大学 | Maximum power point tracking for a power generator |
| CN102904273A (en) * | 2011-07-29 | 2013-01-30 | 通用电气公司 | Maximum power point tracking (MPPT) control of energy conversion system and relevant method |
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2013
- 2013-07-29 CN CN2013103201173A patent/CN103425174A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5682305A (en) * | 1993-11-16 | 1997-10-28 | Canon Kabushiki Kaisha | Method and apparatus for controlling the power of a battery power source |
| JP2001060119A (en) * | 1999-08-20 | 2001-03-06 | Matsushita Electric Works Ltd | Maximum power control method for solar battery |
| CN102870310A (en) * | 2010-04-26 | 2013-01-09 | 金斯顿女王大学 | Maximum power point tracking for a power generator |
| CN102904273A (en) * | 2011-07-29 | 2013-01-30 | 通用电气公司 | Maximum power point tracking (MPPT) control of energy conversion system and relevant method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106062654A (en) * | 2014-02-27 | 2016-10-26 | 松下知识产权经营株式会社 | Power controller and power conditioner |
| CN106062654B (en) * | 2014-02-27 | 2017-10-24 | 松下知识产权经营株式会社 | Output control device and power governor |
| CN104280629A (en) * | 2014-08-07 | 2015-01-14 | 深圳市汇川技术股份有限公司 | Method and system for evaluating maximum power point tracing efficiency of photovoltaic inverter |
| CN104280629B (en) * | 2014-08-07 | 2017-05-31 | 深圳市汇川技术股份有限公司 | The appraisal procedure and system of photovoltaic DC-to-AC converter MPPT maximum power point tracking efficiency |
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Application publication date: 20131204 |