CN204967401U - A mix energy storage system for photovoltaic power generation - Google Patents
A mix energy storage system for photovoltaic power generation Download PDFInfo
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- CN204967401U CN204967401U CN201520583964.3U CN201520583964U CN204967401U CN 204967401 U CN204967401 U CN 204967401U CN 201520583964 U CN201520583964 U CN 201520583964U CN 204967401 U CN204967401 U CN 204967401U
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- bus
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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
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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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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- Photovoltaic Devices (AREA)
Abstract
The utility model provides a dc bus that a mix energy storage system for photovoltaic power generation, it mainly is connected to by photovoltaic power and has the load the dc bus on still be connected with mainly the energy storage mechanism that constitutes by ultracapacitor system and battery respectively, just ultracapacitor system and battery connect through respective two -way buckBoost converter respectively and be in the dc bus on, the dc bus on, ultracapacitor system and battery and separately on the interconnecting link of two -way buckBoost converter respectively through and connect the detection line to connect on the DSP controller that has the ADC converter through signal conditioning circuit, the DSP controller connect two buckBoost converters respectively through two way drive circuit again, the electric energy detect and to be: whether the voltage through the real -time detection dc bus or the voltage of photovoltaic cell output fall, determine whether need mix energy storage system and discharge.
Description
Technical field
The utility model relates to a kind of mixed energy storage system for photovoltaic generation, belong to distributed photovoltaic power generation technical field of energy storage.
Background technology
In angle of solar battery system, due to the random fluctuation of photovoltaic cell, namely photovoltaic cell is not operate in peak power output state the moment, and Maximum Power Output can change along with the change of illumination in season and ambient temperature, is absolutely necessary so increase energy-storage system in angle of solar battery system.Because often kind of energy-storage battery all also exists respective pluses and minuses, if use single energy-storage battery, then can not maximum using photovoltaic system produce rich energy, and use multiple energy-storage battery simultaneously, then can give full play to the advantage of various energy-storage battery, thus the rich energy that photovoltaic system is produced obtains efficiency utilization.Therefore, the hybrid energy-storing in photovoltaic system also starts to come into one's own gradually.In recent years, preliminary research had been done to this technology by some colleges and universities and scientific research institutions both at home and abroad.
Summary of the invention
The purpose of this utility model is the deficiency overcoming prior art existence, and provide a kind of structure to form rationally, easy to use, the Real-time Balancing of photovoltaic generation and load consumption and mixed energy storage system storage of electrical energy can be realized, can meet preferably mixed energy storage system demand, switch and control method for the mixed energy storage system of photovoltaic generation and electric energy detection and system mode.
The purpose of this utility model has been come by following technical solution, a kind of mixed energy storage system for photovoltaic generation, it is connected to the loaded DC bus of band primarily of photo-voltaic power supply, described DC bus is also connected to the stored energy mechanism formed primarily of ultracapacitor and storage battery, and described ultracapacitor and storage battery are connected on described DC bus respectively by respective two-way Buck/Boost converter.
The utility model is preferably: on described DC bus, on the connection line of ultracapacitor and storage battery and respective two-way Buck/Boost converter respectively by and connect detection line, and being connected on the dsp controller with ADC transducer by signal conditioning circuit, described dsp controller connects two Buck/Boost converters that are controlled, that realize the charge or discharge separately of ultracapacitor and storage battery respectively by two-way drive circuit again.
The utility model is further preferably: described dsp controller is configured with keyboard and LCD display and interpersonal interactive interface, wherein keyboard adopts 4 × 4 keyboards, and LCD display uses LCD12864 monochrome liquid crystal display; Separately on described dsp controller, be configured with the communication module that can realize with the mutual serial ports of other facility informations, and the phase parameter in mixed energy storage system can be uploaded with one by this communication module in real time, be connected with the PC wireless telecommunications of scheduling by the monitoring that real-time performance is long-range.
For an electric energy detection method for above-mentioned mixed energy storage system, described electric energy detection method is:
Whether the voltage exported by the voltage or photovoltaic cell that detect DC bus is in real time fallen, and judges whether to need mixed energy storage system to discharge; , also increase photo-voltaic power supply, the detection of the output voltage be namely connected with DC bus through power diode, when the output voltage of photovoltaic cell is less than 48V, mixed energy storage system needs to discharge to DC bus meanwhile; Correspondingly, can charge to mixed energy storage system when protuberance appears in DC bus-bar voltage or photovoltaic cell output voltage; Thus, can be able to be judged between each state the need of switching by the fluctuation situation detecting DC bus-bar voltage or photo-voltaic power supply output voltage.
Utilize above-mentioned mixed energy storage system electric energy detection to carry out system mode to switch and the method controlled, described system mode comprises stable state, charged state and discharge condition, and described system mode switching mainly comprises with the method controlled:
Detect during mixed energy storage system stable state that DC bus electric energy is rich, and be converted to the switching controls of charging;
Detect that DC bus needs electric energy when stable state, and be converted to the switching controls of electric discharge;
In charging process, detect that DC bus needs electric energy, and be converted to the switching controls of electric discharge;
In discharge process, detect that DC bus needs electric energy, and be converted to the switching controls of electric discharge;
In discharge process, detect that DC bus electric energy is rich, and be converted to the switching controls of charging.
The utility model is preferably: described system mode switches with the method controlled:
When detecting that DC bus-bar voltage is swelled suddenly or the voltage that exports by detecting photovoltaic cell uprises, system must switch to charged state from stable state or discharge condition, and then which kind of charged state is system determine by the size judging voltage and swell;
The independent charged state of storage battery is switched to when voltage protuberance is less;
Then switch to the independent charged state of ultracapacitor when voltage protuberance is larger, now the feature of ultracapacitor power density is not fully exerted; Just switch to the two when voltage protuberance is very large and combine charging, now ultracapacitor can absorb larger current in short-term, adds storage battery and can absorb certain electric current, therefore can stabilize the protuberance of power down pressure quickly;
If when ultracapacitor or the independent charged state of storage battery, during the situation that the voltage experience that the DC bus of system or photo-voltaic power supply export goes up not down, then charged state is directly converted to the two and combines charged state separately;
And when detecting the protuberance voltage returns of bus or photo-voltaic power supply output to time normal, system then must be returned to stable state;
When systems axiol-ogy occurs falling to the voltage of bus or the voltage of photovoltaic cell output, system must switch to discharge condition from stable state or charged state; Now, can judge to switch to which kind of discharge condition according to the degree of Voltage Drop, when Voltage Drop is less, system can switch to the independent discharge condition of storage battery; The independent discharge condition of ultracapacitor is then switched to when Voltage Drop is larger; The two associating discharge condition is just switched to when Voltage Drop is very large;
If in discharge process, the voltage that DC bus or photo-voltaic power supply export, when not rising counter falling, then discharge condition is directly converted to the two associating discharge condition separately;
And when the drop-off voltage detecting bus or photo-voltaic power supply output is returned to normal, system then must be returned to stable state.
Mixed energy storage system in angle of solar battery system described in the utility model mainly comprises storage battery, ultracapacitor and DC/DC transform controller, simultaneously in order to give full play to the feature that ultracapacitor power density is large and storage battery energy density is large, and increase the control flexibility of hybrid energy-storing, ultracapacitor and storage battery is adopted to connect two-way Buck/Boost converter respectively, and then the structure be connected with DC bus; It has structure composition rationally, easy to use, can realize the Real-time Balancing of photovoltaic generation and load consumption and mixed energy storage system storage of electrical energy, can meet the features such as mixed energy storage system demand preferably.
Accompanying drawing explanation
Fig. 1 is system architecture diagram described in the utility model.
Fig. 2 is the circuit theory diagrams of two-way Buck/Boost converter described in the utility model.
Fig. 3 is mixed energy storage system structured flowchart described in the utility model,
Fig. 4 is mixed energy storage system state switching controls schematic diagram described in the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail: shown in Fig. 1, a kind of mixed energy storage system for photovoltaic generation described in the utility model, it is connected to DC bus 4 with load 3 primarily of photo-voltaic power supply 1 through power diode 2, described DC bus 4 is also connected to the stored energy mechanism formed primarily of ultracapacitor 5 and storage battery 6, and described ultracapacitor 5 and storage battery 6 are connected on described DC bus 4 respectively by respective two-way Buck/Boost converter 7;
As shown in Figure 2, the two-way Buck/Boost converter in the utility model is when being operated in Buck pattern, and 48V DC bus is to ultracapacitor and charge in batteries for described two-way Buck/Boost converter 7; When being operated in Boos pattern, ultracapacitor and storage battery are then to 48V DC bus electric energy supplement.Wherein, the rated voltage of ultracapacitor and electric power storage is all 24V.Consider that 48V DC bus may occur small fluctuation under special circumstances, expand the high side voltage excursion of converter, therefore, the scope of setting converter high-pressure side input voltage is 36 ~ 60V.Consider that converter low-pressure side is the voltage input end of ultracapacitor and storage battery, be not just can compensate electric energy to 48V DC bus when the two voltage is very low, therefore, the minimum voltage that setting ultracapacitor and storage battery compensate electric energy to 48V DC bus is 12V, so the voltage change range of low-pressure side is 12 ~ 24V.In the design, the rated power setting converter is 500W; Ripple voltage Up-p is 20mV; The switching frequency fs of MOSFET is 20kHz; Following table is two-way Buck/Boost converter key property index:
| High side voltage U h | 36 ~ 60V (specified 48V) |
| Low-pressure side voltage U l | 12～24V |
| Rated power P | 500W |
| Switching frequency f s | 20kHz |
Shown in Fig. 3, the further embodiment of the utility model is: on described DC bus 4, on ultracapacitor 5 and storage battery 6 and the connection line of respective two-way Buck/Boost converter 7 respectively by and connect detection line 41,51,61, and being connected on the dsp controller 8 with ADC transducer by signal conditioning circuit, described dsp controller 8 connects two Buck/Boost converters 7 that are controlled, that realize ultracapacitor 5 and the respective charge or discharge of storage battery 6 respectively by two-way drive circuit 9 again.
The utility model on described dsp controller 8, be configured with keyboard 10 and LCD shows 11 and interpersonal interactive interface, and wherein keyboard 10 adopts 4 × 4 keyboards, and LCD display 11 uses LCD12864 monochrome liquid crystal display; Separately on described dsp controller, be configured with the communication module 12 that can realize with the mutual serial ports of other facility informations, and the phase parameter in mixed energy storage system can be uploaded with one by this communication module 12 in real time, be connected with the PC wireless telecommunications of scheduling by the monitoring that real-time performance is long-range.
In order to realize the Real-time Balancing of photovoltaic generation and load consumption and mixed energy storage system storage of electrical energy in the utility model, the detection of DC bus electric energy is absolutely necessary precondition, and it is the basis realizing accurate judgement state switching controls; According to the feature of DC bus and independent photovoltaic direct current micro-grid system, propose direct-current micro-grid electric energy detection method, described electric energy detection method is:
Whether the voltage exported by the voltage or photovoltaic cell that detect DC bus is in real time fallen, and judges whether to need mixed energy storage system to discharge; , also increase photo-voltaic power supply, the detection of the output voltage be namely connected with DC bus through power diode, when the output voltage of photovoltaic cell is less than 48V, mixed energy storage system needs to discharge to DC bus meanwhile; Correspondingly, can charge to mixed energy storage system when protuberance appears in DC bus-bar voltage or photovoltaic cell output voltage; Thus, can be able to be judged between each state the need of switching by the fluctuation situation detecting DC bus-bar voltage or photo-voltaic power supply output voltage.
In the utility model, the stable state of mixed energy storage system refers to that the electric energy that needed for DC bus load, electric energy and photovoltaic cell send mates just, mixed energy storage system is in the state of also not discharging of namely not charging, and two that are connected with storage battery with ultracapacitor two-way Buck/Boost converters do not work.Mixed energy storage system operationally, mainly can divide stable state, charged state and discharge condition.Charged state can be divided into again ultracapacitor or the independent charged state of storage battery and the two to combine charged state; Discharge condition then can be divided into ultracapacitor or the independent discharge condition of storage battery and the two to combine discharge condition.
Shown in Fig. 4, a kind of method utilizing mixed energy storage system electric energy detection described in claim 4 to carry out system mode switching and control, described system mode comprises stable state, charged state and discharge condition, and described system mode switches and the method for control mainly comprises:
Detect during mixed energy storage system stable state that DC bus electric energy is rich, and be converted to the switching controls of charging;
Detect that DC bus needs electric energy when stable state, and be converted to the switching controls of electric discharge;
In charging process, detect that DC bus needs electric energy, and be converted to the switching controls of electric discharge;
In discharge process, detect that DC bus needs electric energy, and be converted to the switching controls of electric discharge;
In discharge process, detect that DC bus electric energy is rich, and be converted to the switching controls of charging.
The further embodiment of the utility model is: described system mode switches with the method controlled:
When detecting that DC bus-bar voltage is swelled suddenly or the voltage that exports by detecting photovoltaic cell uprises, system must switch to charged state from stable state or discharge condition, and then which kind of charged state is system determine by the size judging voltage and swell;
The independent charged state of storage battery is switched to when voltage protuberance is less;
Then switch to the independent charged state of ultracapacitor when voltage protuberance is larger, now the feature of ultracapacitor power density is not fully exerted; Just switch to the two when voltage protuberance is very large and combine charging, now ultracapacitor can absorb larger current in short-term, adds storage battery and can absorb certain electric current, therefore can stabilize the protuberance of power down pressure quickly;
If when ultracapacitor or the independent charged state of storage battery, during the situation that the voltage experience that the DC bus of system or photo-voltaic power supply export goes up not down, then charged state is directly converted to the two and combines charged state separately;
And when detecting the protuberance voltage returns of bus or photo-voltaic power supply output to time normal, system then must be returned to stable state;
When systems axiol-ogy occurs falling to the voltage of bus or the voltage of photovoltaic cell output, system must switch to discharge condition from stable state or charged state; Now, can judge to switch to which kind of discharge condition according to the degree of Voltage Drop, when Voltage Drop is less, system can switch to the independent discharge condition of storage battery; The independent discharge condition of ultracapacitor is then switched to when Voltage Drop is larger; The two associating discharge condition is just switched to when Voltage Drop is very large;
If in discharge process, the voltage that DC bus or photo-voltaic power supply export, when not rising counter falling, then discharge condition is directly converted to the two associating discharge condition separately;
And when the drop-off voltage detecting bus or photo-voltaic power supply output is returned to normal, system then must be returned to stable state.
Claims (3)
1. the mixed energy storage system for photovoltaic generation, it is connected to the loaded DC bus of band primarily of photo-voltaic power supply, it is characterized in that described DC bus being also connected to the stored energy mechanism formed primarily of ultracapacitor and storage battery, and described ultracapacitor and storage battery are connected on described DC bus respectively by respective two-way Buck/Boost converter.
2. the mixed energy storage system for photovoltaic generation according to claim 1, it is characterized in that on described DC bus, on the connection line of ultracapacitor and storage battery and respective two-way Buck/Boost converter respectively by and connect detection line, and being connected on the dsp controller with ADC transducer by signal conditioning circuit, described dsp controller connects two Buck/Boost converters that are controlled, that realize the charge or discharge separately of ultracapacitor and storage battery respectively by two-way drive circuit again.
3. the mixed energy storage system for photovoltaic generation according to claim 2, it is characterized in that described dsp controller is configured with keyboard and LCD display and interpersonal interactive interface, wherein keyboard adopts 4 × 4 keyboards, and LCD display uses LCD12864 monochrome liquid crystal display; Separately on described dsp controller, be configured with the communication module that can realize with the mutual serial ports of other facility informations, and the phase parameter in mixed energy storage system can be uploaded with one by this communication module in real time, be connected with the PC wireless telecommunications of scheduling by the monitoring that real-time performance is long-range.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520583964.3U CN204967401U (en) | 2015-08-05 | 2015-08-05 | A mix energy storage system for photovoltaic power generation |
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| CN201520583964.3U CN204967401U (en) | 2015-08-05 | 2015-08-05 | A mix energy storage system for photovoltaic power generation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048619A (en) * | 2015-08-05 | 2015-11-11 | 国网浙江省电力公司嘉兴供电公司 | Hybrid energy storage system for photovoltaic power generation, electric energy detection method and system state switching and control method |
| CN109687563A (en) * | 2017-10-19 | 2019-04-26 | 江苏扬航光电科技有限公司 | A kind of hybrid accumulator on photovoltaic apparatus |
| CN114123331A (en) * | 2021-11-26 | 2022-03-01 | 国网甘肃省电力公司经济技术研究院 | Photovoltaic low-voltage ride-through control method, system, equipment, medium and terminal |
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2015
- 2015-08-05 CN CN201520583964.3U patent/CN204967401U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048619A (en) * | 2015-08-05 | 2015-11-11 | 国网浙江省电力公司嘉兴供电公司 | Hybrid energy storage system for photovoltaic power generation, electric energy detection method and system state switching and control method |
| CN109687563A (en) * | 2017-10-19 | 2019-04-26 | 江苏扬航光电科技有限公司 | A kind of hybrid accumulator on photovoltaic apparatus |
| CN114123331A (en) * | 2021-11-26 | 2022-03-01 | 国网甘肃省电力公司经济技术研究院 | Photovoltaic low-voltage ride-through control method, system, equipment, medium and terminal |
| CN114123331B (en) * | 2021-11-26 | 2022-08-05 | 国网甘肃省电力公司经济技术研究院 | Photovoltaic low-voltage ride-through control method, system, equipment, medium and terminal |
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Granted publication date: 20160113 Termination date: 20200805 |
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