CN103337868A - Method and device for inhibiting photovoltaic generation output power fluctuation - Google Patents
Method and device for inhibiting photovoltaic generation output power fluctuation Download PDFInfo
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- CN103337868A CN103337868A CN2013102571332A CN201310257133A CN103337868A CN 103337868 A CN103337868 A CN 103337868A CN 2013102571332 A CN2013102571332 A CN 2013102571332A CN 201310257133 A CN201310257133 A CN 201310257133A CN 103337868 A CN103337868 A CN 103337868A
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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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses a method and a device for inhibiting photovoltaic generation output power fluctuation. The method comprises the steps as follows: connecting photovoltaic array assemblies in series or in parallel, charging an energy storage device through a DC/DC (direct current/direct current) charging device, converting energy into an alternating-current power supply through a bidirectional converter, and supplying the power supply to a load; and at night or in the absence of sunlight, charging the energy storage device through the DC/AC bidirectional converter by electric energy of a power grid during the period that the valley electricity price of the power grid is cheap so as to achieve a peak load shifting effect of the power grid. A principle is that the photovoltaic output power is stabilized by the capacity of the energy storage device to guarantee stable output power, improve power supplying reliability and output the electric energy with qualified quality to a user. The energy generated by photovoltaic generation is stored at first and then converted into the alternating-current power supply through the bidirectional converter, and the power supply is supplied to the load; and under the circumstance that the energy storage capacity is full, a controller is switched to a floating charge mode, the power supply is directly supplied to the load, and the stored energy serves as a supplement.
Description
Technical field
The present invention relates to a kind of method and device that suppresses the photovoltaic generation output-power fluctuation, belong to the solar-photovoltaic technology field.
Background technology
At present, solar photovoltaic generation system by and net mode can be divided into: from net electricity generation system, grid-connected system mode, by the form of bus bars branch dc bus and ac bus dual mode are arranged.The dc bus mode is that photovoltaic array component is pooled to dc bus earlier, is converted to supply load after the AC power by a DC/AC inverter again.The ac bus mode is to be pooled to ac bus after photovoltaic array component is converted to AC power by the DC/AC inverter, then supply load.Photovoltaic generation all adopts MPPT maximum power point tracking technology (MPPT) at present, realizes the maximum utilization of solar energy, but does not possess the power adjustments ability; It is bigger that the while photovoltaic generating system is subjected to condition influence such as illumination, temperature, when direct current output is interrupted, exchanges side output and present quick turn-off characteristic, and the current fluctuation rate is bigger.According to pertinent literature, under cloudy weather, the power fluctuation of photovoltaic generation can reach 25% of installed capacity, and the maximum fluctuation rate reaches 10% rated output per second.
The problem of, unadjustable control big for the power fluctuation that solves photovoltaic generation, the method that adopts is to increase energy storage device (being generally battery) at present, be installed on dc bus or the ac bus, input, output according to system power balance control energy storage, but the influence of controlled system, with and control strategy be to control according to voltage fluctuation, factors such as hysteresis are arranged in time, cause output-power fluctuation bigger, the system voltage fluctuation is bigger.
Summary of the invention
The technical problem to be solved in the present invention provides that a kind of system power fluctuation simple, that can effectively solve photovoltaic generation is big, the problem of unadjustable control, make its power export method and the device of stable inhibition photovoltaic generation output-power fluctuation, can overcome the deficiencies in the prior art.
Technical scheme of the present invention is: the method that suppresses the photovoltaic generation output-power fluctuation be with photovoltaic array component by string, side by side after, by the DC/DC charging device, energy storage device is charged, be converted into AC power by two-way inverter again, power to the load; In night or when not having sunlight, utilize electrical network trough electricity price cheap, the electrical network electric energy is charged to energy storage device by the two-way inverter of DC/AC, play the effect of electrical network peak load shifting.
The device that suppresses the photovoltaic generation output-power fluctuation, it comprises the above photovoltaic array component of a cover, and photovoltaic array component is connected with energy storage device, and the output of energy storage device is connected with the electrical network load by two-way inverter.
The above photovoltaic array component of one cover interconnects by series, parallel or connection in series-parallel combination.
Between photovoltaic array component and energy storage device, be provided with the DC/DC charging device.
Described two-way inverter is the two-way inverter of DC/AC.
Compared with the prior art, the present invention with photovoltaic array component by string, side by side after, by the DC/DC charging device, energy storage (battery) is charged, be converted into AC power by two-way inverter again, power to the load.In night or when not having sunlight, utilize electrical network trough electricity price cheap, the electrical network electric energy is charged to energy storage device by the two-way inverter of DC/AC, play the effect of electrical network peak load shifting.Its principle is: utilize the capacity of energy storage device that the photovoltaic power output is stabilized, guarantee the stable of power output, improve power supply reliability, carry the electric energy of acceptable quality to the user.Photovoltaic generation is introduced into energy storage, is converted into AC power by two-way inverter again, powers to the load; Under the full situation of stored energy capacitance, controller transfers " floating charge " mode to, and directly to the load power supply, energy storage as a supplement.
Description of drawings
Fig. 1 is structural representation of the present invention.
Embodiment
This syndeton of installing each parts as shown in Figure 1, above photovoltaic array component 1 string of a cover, charge to energy storage device 3 by DC/DC charging device 2 in the back side by side, is converted into AC power by two-way inverter 4 again, to electrical network load 5 power supplies.
Playing concrete supply power mode is:
In night or setting period, utilize the electrical network energy, charge by 4 pairs of energy storage devices 3 of two-way inverter, take full advantage of electricity price between peak and valley, electrical network is played the peak load shifting effect, be that charging stopped after battery was full of electricity up to energy storage device 3.
When photovoltaic array component 1 output energy, and the energy that needs greater than electrical network load 5 of the energy that sends of photovoltaic array component 1, when energy storage device 3 also can charge, allow DC/DC charging device 2 be operated in the MPPT power points, give energy storage device 3 chargings, simultaneously unnecessary electric energy is powered to load 5 by two-way inverter 4.
When the energy of photovoltaic array component 1 output, and the power that needs greater than load 5, and energy storage device 3 charging voltages have been when having reached overcharged voltage, then directly by " floating charge " mode to load 5 power supplies.
The energy that the energy of exporting when photovoltaic array component 1 needs less than load 5, not enough energy demand is replenished by battery discharging, and DC/DC charging device 2 is operated in the MPPT power points, and two-way inverter 4 is operated in discharge mode.
Claims (5)
1. method that suppresses the photovoltaic generation output-power fluctuation, it is characterized in that: this method be with photovoltaic array component more than a group by string, side by side after, by the DC/DC charging device, energy storage device is charged, be converted into AC power by two-way inverter again, power to the load; In night or when not having sunlight, utilize electrical network trough electricity price cheap, the electrical network electric energy is charged to energy storage device by the two-way inverter of DC/AC, play the effect of electrical network peak load shifting.
2. device that suppresses the photovoltaic generation output-power fluctuation, it comprises the above photovoltaic array component (1) of a cover, it is characterized in that: photovoltaic array component (1) is connected with energy storage device (3), and the output of energy storage device (3) is connected with electrical network load (5) by two-way inverter (4).
3. a kind of device that suppresses the photovoltaic generation output-power fluctuation according to claim 2 is characterized in that: the above photovoltaic array component (1) of a cover is by string, interconnect side by side.
4. a kind of device that suppresses the photovoltaic generation output-power fluctuation according to claim 2 is characterized in that: be provided with DC/DC charging device (2) between photovoltaic array component (1) and energy storage device (3).
5. a kind of device that suppresses the photovoltaic generation output-power fluctuation according to claim 2, it is characterized in that: described inverter (4) is the two-way inverter of DC/AC.
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| CN2013102571332A CN103337868A (en) | 2013-06-26 | 2013-06-26 | Method and device for inhibiting photovoltaic generation output power fluctuation |
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| CN2013102571332A CN103337868A (en) | 2013-06-26 | 2013-06-26 | Method and device for inhibiting photovoltaic generation output power fluctuation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104124690A (en) * | 2014-06-28 | 2014-10-29 | 广东元景能源股份有限公司 | Intelligent household photovoltaic energy storage system |
| CN107332270A (en) * | 2016-04-29 | 2017-11-07 | 伊顿飞瑞慕品股份有限公司 | Energy management apparatus for grid-connected photovoltaic system |
| CN108377120A (en) * | 2018-01-29 | 2018-08-07 | 南京南瑞继保电气有限公司 | It is a kind of that photovoltaic fluctuation method is stabilized based on equal-area method |
| CN109804519A (en) * | 2017-08-14 | 2019-05-24 | 戴纳动力有限责任公司 | Method and apparatus for ovonic memory and renewable power converter |
| CN112688368A (en) * | 2021-01-05 | 2021-04-20 | 国网甘肃省电力公司电力科学研究院 | Source network coordination peak regulation method for power grid at transmitting end |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104124690A (en) * | 2014-06-28 | 2014-10-29 | 广东元景能源股份有限公司 | Intelligent household photovoltaic energy storage system |
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| CN109804519A (en) * | 2017-08-14 | 2019-05-24 | 戴纳动力有限责任公司 | Method and apparatus for ovonic memory and renewable power converter |
| CN108377120A (en) * | 2018-01-29 | 2018-08-07 | 南京南瑞继保电气有限公司 | It is a kind of that photovoltaic fluctuation method is stabilized based on equal-area method |
| CN108377120B (en) * | 2018-01-29 | 2019-09-27 | 南京南瑞继保电气有限公司 | It is a kind of that photovoltaic fluctuation method is stabilized based on equal-area method |
| CN112688368A (en) * | 2021-01-05 | 2021-04-20 | 国网甘肃省电力公司电力科学研究院 | Source network coordination peak regulation method for power grid at transmitting end |
| CN112688368B (en) * | 2021-01-05 | 2022-09-16 | 国网甘肃省电力公司电力科学研究院 | Source network coordination peak regulation method for power grid at transmitting end |
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Application publication date: 20131002 |