CN203301166U - Device for suppressing photovoltaic power generation output power fluctuation - Google Patents

Device for suppressing photovoltaic power generation output power fluctuation Download PDF

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Publication number
CN203301166U
CN203301166U CN201320369191XU CN201320369191U CN203301166U CN 203301166 U CN203301166 U CN 203301166U CN 201320369191X U CN201320369191X U CN 201320369191XU CN 201320369191 U CN201320369191 U CN 201320369191U CN 203301166 U CN203301166 U CN 203301166U
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CN
China
Prior art keywords
power
energy storage
photovoltaic
output
load
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201320369191XU
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Chinese (zh)
Inventor
文贤馗
曾华荣
陈仕军
刘君
徐梅梅
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Guizhou Electric Power Test and Research Institute
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Guizhou Electric Power Test and Research Institute
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Priority to CN201320369191XU priority Critical patent/CN203301166U/en
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Publication of CN203301166U publication Critical patent/CN203301166U/en
Expired - Fee Related legal-status Critical Current
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

The utility model discloses a device for suppressing photovoltaic power generation output power fluctuations. The device comprises more than one set of photovoltaic array assembly (1), and is characterized in that: the photovoltaic array assembly (1) is connected with an energy storage device (3), and an output of the energy storage device (3) is connected with a power grid load (5) through a bidirectional inverter (4). The device is based on the principle of utilizing the capacity of the energy storage device to stabilize the photovoltaic output power, ensure the stability of output power, improve the reliability of power supply, and transmit qualified electric energy to users. The photovoltaic generated power enters into the energy storage device firstly, and then is converted to an AC power through the bidirectional inverter for providing power to a load; and a controller is changed into a ''float charging'' manner, and the load is directly powered with the energy storage device as a supplement when the capacity of the energy storage device is full.

Description

A kind of device that suppresses the photovoltaic generation output-power fluctuation
Technical field
The utility model relates to a kind of device that suppresses the photovoltaic generation output-power fluctuation, belongs 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 form of bus bars, divide DC bus and two kinds of modes of ac bus arranged.The DC bus mode is that photovoltaic array component first is pooled to DC bus, then is converted to supply load after AC power by a DC/AC inverter.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 larger that the while photovoltaic generating system is subject to the condition influence such as illumination, temperature, and when direct current output was interrupted, AC output presented quick turn-off characteristic, and the current fluctuation rate is larger.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.
For the power fluctuation that solves photovoltaic generation is large, the problem of unadjustable control, the method that adopts at present is to increase energy storage device (being generally battery), be arranged on DC bus or ac bus, according to the system power balance, control input, the output of energy storage, but the impact of controlled system, with and control strategy be to control according to voltage fluctuation, the factors such as hysteresis are arranged in time, cause output-power fluctuation larger, the system voltage fluctuation is larger.
Summary of the invention
The technical problems to be solved in the utility model is to provide that a kind of system power fluctuation simple, that can effectively solve photovoltaic generation is large, the problem of unadjustable control, make the device of the stable inhibition photovoltaic generation output-power fluctuation of its power stage, can overcome the deficiencies in the prior art.
The technical solution of the utility model is: a kind of device that suppresses the photovoltaic generation output-power fluctuation, it comprises the above photovoltaic array component of a cover, 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 utility model by after series and parallel, by the DC/DC charging device, charges photovoltaic array component, then is converted into AC power by two-way inverter to energy storage (battery), power to the load.During in night or without 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 to stabilize the photovoltaic power output, guarantee the stable of power output, improve power supply reliability, to the user, carry the electric energy of acceptable quality.Photovoltaic generation is introduced into energy storage, then is converted into AC power by two-way inverter, powers to the load; In the situation that stored energy capacitance is full, controller transfers " floating charge " mode to, and directly to load supplying, energy storage as a supplement.
The accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
This syndeton of installing each parts as shown in Figure 1, by DC/DC charging device 2, is charged to energy storage device 3, then is converted into AC power by two-way inverter 4, to electrical network load 5 power supplies after above photovoltaic array component 1 series and parallel of a cover.
Playing concrete supply power mode is:
At night or set the period, utilize power grid energy, by 4 pairs of energy storage devices 3 of two-way inverter, charge, take full advantage of electricity price between peak and valley, electrical network is played to the peak load shifting effect, until energy storage device 3 is battery be full of electricity after, charging stops.
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 while having reached overcharged voltage, 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 supplemented 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 (4)

1. 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).
2. a kind of device that suppresses the photovoltaic generation output-power fluctuation according to claim 1 is characterized in that: the above photovoltaic array component (1) of a cover interconnects by series and parallel.
3. a kind of device that suppresses the photovoltaic generation output-power fluctuation according to claim 1, is characterized in that: between photovoltaic array component (1) and energy storage device (3), be provided with DC/DC charging device (2).
4. a kind of device that suppresses the photovoltaic generation output-power fluctuation according to claim 1, it is characterized in that: described inverter (4) is the two-way inverter of DC/AC.
CN201320369191XU 2013-06-26 2013-06-26 Device for suppressing photovoltaic power generation output power fluctuation Expired - Fee Related CN203301166U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320369191XU CN203301166U (en) 2013-06-26 2013-06-26 Device for suppressing photovoltaic power generation output power fluctuation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320369191XU CN203301166U (en) 2013-06-26 2013-06-26 Device for suppressing photovoltaic power generation output power fluctuation

Publications (1)

Publication Number Publication Date
CN203301166U true CN203301166U (en) 2013-11-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201320369191XU Expired - Fee Related CN203301166U (en) 2013-06-26 2013-06-26 Device for suppressing photovoltaic power generation output power fluctuation

Country Status (1)

Country Link
CN (1) CN203301166U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103337868A (en) * 2013-06-26 2013-10-02 贵州电力试验研究院 Method and device for inhibiting photovoltaic generation output power fluctuation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103337868A (en) * 2013-06-26 2013-10-02 贵州电力试验研究院 Method and device for inhibiting photovoltaic generation output power fluctuation

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GR01 Patent grant
EXPY Termination of patent right or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20131120

Termination date: 20150626