CN105576307A - Charging and discharging method of storage battery in photovoltaic system - Google Patents
Charging and discharging method of storage battery in photovoltaic system Download PDFInfo
- Publication number
- CN105576307A CN105576307A CN201510925698.2A CN201510925698A CN105576307A CN 105576307 A CN105576307 A CN 105576307A CN 201510925698 A CN201510925698 A CN 201510925698A CN 105576307 A CN105576307 A CN 105576307A
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- Prior art keywords
- storage battery
- charging
- batteries
- charge
- photovoltaic system
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/448—End of discharge regulating measures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a charging and discharging method of a storage battery in a photovoltaic system. The method comprises the following steps: when Ppv is greater than Pload, charging the storage battery by photovoltaic electric energy in the photovoltaic system by preset maximum allowable charging current; when the charging voltage of the storage battery achieves preset overcharging voltage, linearly reducing the preset maximum allowable charging current to C/100, and continuing to charge the storage battery at the charging current of C/100; when the charging voltage of the storage battery reaches the overcharging voltage again and the state of charge of the storage battery is 1, stopping charging the storage battery. The charging and discharging method of the storage battery in the photovoltaic system can improve the performance of the storage battery and can effectively alleviate the invalidation speed of the storage battery, and the service life of the storage battery is effectively improved so as to effectively improve the integral performance of the whole photovoltaic system.
Description
Technical field
The present invention relates to photovoltaic system technical field, the charging/discharging thereof of storage battery in a kind of photovoltaic system.
Background technology
Storage battery, as an important component part in angle of solar battery system, plays vital effect.The deficiency of solar energy supply can be supplemented under illumination condition, unnecessary solar energy can be stored again; Under non-illuminated conditions, it is the unique energy of load.Storage battery cost ratio shared by whole photovoltaic system is relatively high, and by the impact of external environment and condition, it all can not reach its normal service life usually, and then affects the service life of whole photovoltaic system.
For addressing these problems, not only need to improve storage battery self performance, the EMS of high-quality is most important on whole photovoltaic system impact.Adopt cost performance comparatively plumbic acid battery in the present invention, by Optimal Control Strategy and method, improve its accumulator property and effectively slow down its disable velocity, effectively improving the overall performance of whole photovoltaic system.
Summary of the invention
The charging/discharging thereof of storage battery in a kind of photovoltaic system is provided in the embodiment of the present invention, the technical problem of its normal service life can not be reached to solve storage battery in prior art.
For achieving the above object, the embodiment of the present invention provides the charging/discharging thereof of storage battery in a kind of photovoltaic system, comprising: work as P
pv> P
loadtime, to preset maximum permission charging current, adopt the photovoltaic electric energy in photovoltaic system to charge to storage battery, wherein, P
pvfor photovoltaic cell capable of generating power power, P
loadfor bearing power; When the charging voltage of described storage battery reaches default overcharged voltage, described default maximum permission charging current is linearly reduced to C/100, and continue to charge to described storage battery with the charging current of C/100, C is battery capacity; When the charging voltage of described storage battery reaches described default overcharged voltage again, the state-of-charge of described storage battery is 1, stops charging to described storage battery.
As preferably, charging is carried out to described storage battery and comprises: storage battery in photovoltaic system is divided into groups; The photovoltaic electric energy in photovoltaic system is adopted to charge to storage battery and batteries.
As preferably, storage battery in photovoltaic system is divided into groups, comprising: by controlling the on-off of programmable battery switch arrays breaker in middle, control multiple storage battery serial or parallel connection and form batteries.
As preferably, also comprise: by controlling the on-off of charge and discharge switch array breaker in middle able to programme, series-connection charge-discharge is carried out to storage battery and batteries; Or parallel charge-discharge is carried out to storage battery and batteries.
As preferably, discharged in series is carried out to storage battery and batteries, comprise: when detecting that current existence reaches storage battery or the batteries of overdischarge pressure, control the on-off of described charge and discharge switch array breaker in middle able to programme, bypass reaches storage battery or the batteries of overdischarge pressure.
As preferably, batteries is connected by multiple storage battery and is formed, batteries is charged, comprise: the charging voltage detecting each storage battery in batteries in real time, detect current when having the charging voltage of storage battery to reach default overcharged voltage, control the on-off of described charge and discharge switch array breaker in middle able to programme, bypass reaches the storage battery of default overcharged voltage and connects load, continue as other charge in batteries in batteries, until the charging voltage of all storage batterys reaches default overcharged voltage in batteries.
As preferably, described storage battery is lead-acid battery.
Apply technical scheme of the present invention, in photovoltaic system, the charging/discharging thereof of storage battery comprises: work as P
pv> P
loadtime, to preset maximum permission charging current, adopt the photovoltaic electric energy in photovoltaic system to charge to storage battery; When the charging voltage of described storage battery reaches default overcharged voltage, described default maximum permission charging current is linearly reduced to C/100, continues to charge to described storage battery with the charging current of C/100; When the charging voltage of described storage battery reaches described default overcharged voltage again, the state-of-charge of described storage battery is 1, stops charging to described storage battery.The charging/discharging thereof of storage battery in photovoltaic system of the present invention, realize the management of charging and discharging strategy based on Current adjustment, to utilize photovoltaic electric energy to greatest extent, improve accumulator property and effectively slow down its disable velocity, effective prolonging service life of battery, and then the overall performance effectively improving whole photovoltaic system.
Accompanying drawing explanation
Fig. 1 is the flow chart of the charging/discharging thereof of storage battery in the photovoltaic system of the embodiment of the present invention;
Fig. 2 is the charge in batteries schematic diagram of the embodiment of the present invention;
Fig. 3 is the accumulator cell charging and discharging management system functional schematic of the embodiment of the present invention;
Fig. 4 is the accumulator cell charging and discharging management system structure chart of the embodiment of the present invention;
Fig. 5 is the photovoltaic charged pattern diagram of the embodiment of the present invention;
Fig. 6 is the battery discharging mode schematic diagram of the embodiment of the present invention;
Fig. 7 (a) is the accumulator cell charging and discharging pattern diagram 1 of the embodiment of the present invention
Fig. 7 (b) is the accumulator cell charging and discharging pattern diagram 2 of the embodiment of the present invention;
Fig. 8 is the batteries serial connection charge pattern diagram of the embodiment of the present invention;
Fig. 9 is the batteries serial connection charge pattern configurations bypass schematic diagram 1 of the embodiment of the present invention;
Figure 10 is the batteries serial connection charge pattern configurations bypass schematic diagram 2 of the embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, but not as a limitation of the invention.
Shown in Figure 1, according to embodiments of the invention, in photovoltaic system, the charging/discharging thereof of storage battery comprises:
Step 101: work as P
pv> P
loadtime, to preset maximum permission charging current, adopt the photovoltaic electric energy in photovoltaic system to charge to storage battery, wherein, P
pvfor photovoltaic cell capable of generating power power, P
loadfor bearing power;
Step 102: when the charging voltage of described storage battery reaches default overcharged voltage, described default maximum permission charging current is linearly reduced to C/100, and continue to charge to described storage battery with the charging current of C/100, C is battery capacity;
Step 103: when the charging voltage of described storage battery reaches described default overcharged voltage again, the state-of-charge of described storage battery is 1, stops charging to described storage battery.
The charging/discharging thereof of storage battery in photovoltaic system of the present invention, realize the management of charging and discharging strategy based on Current adjustment, to utilize photovoltaic electric energy to greatest extent, improve accumulator property and effectively slow down its disable velocity, effective prolonging service life of battery, and then the overall performance effectively improving whole photovoltaic system.
During concrete enforcement, in photovoltaic system, accumulator cell charging and discharging number of times is frequent, by illumination seasonal variety and continuously the extreme weather such as cloudy day affect, easily cause the deep discharge of storage battery and cross put after be difficult to again be full of in a short time, therefore appropriate battery management strategy can effectively improve battery efficiency and extend life expectancy, for making full use of photovoltaic electric energy to greatest extent, the application adopts the accumulator cell charging and discharging management strategy based on Current adjustment.(Voltage/V represents that ordinate is voltage axis as shown in Figure 2, unit is V), adopt the lead-acid battery that cost performance is higher, the overcharged voltage of setting single battery is 2.4V (i.e. above-mentioned default overcharged voltage), the state that storage battery reaches SOC (StateofCharge, state-of-charge)=1 is only with to reach overcharged voltage working point when charging a battery with the charge rate of C/100 relevant.Therefore, the application to the detailed process that storage battery charges is: work as P
pv> P
loadtime, storage battery charges to set maximum permission charging current, otherwise the corresponding reduction of charging current.When the charging voltage of storage battery reaches overcharged voltage 2.4V, the above-mentioned maximum permission charging current of linear reduction, until C/100, when battery tension reaches overcharged voltage again, thinks that storage battery is filled, now SOC=1.
During concrete enforcement, charge less state is in for a long time for preventing storage battery, storage battery can be carried out grouping management, limited photovoltaic electric energy is concentrated to be that partial monosomy battery or batteries are charged, it is made to reach full state fast, and same strategy is carried out to all the other monomers or group, improve long-term disposal charge less situation, thus prolonging service life of battery, such as, storage battery is divided into groups, adopts the photovoltaic electric energy in photovoltaic system to charge to storage battery and batteries, when load consuming power and photovoltaic cell capable of generating power power P
pv> bearing power P
loadtime, can be storage battery or battery charging by unnecessary photovoltaic electric energy; When load not consumed power time, photovoltaic generation power is all used for as storage battery or battery charging, according to system adopt the cell capacity of batteries to judge the mistake of charging system is put or deep discharge.Concrete, as shown in Figure 3,4, in above-mentioned photovoltaic system, the charging/discharging thereof of storage battery can be realized by storage battery administration module able to programme, concrete, storage battery in photovoltaic system is divided into groups, comprising: by controlling the on-off of programmable battery switch arrays breaker in middle, controlling multiple storage battery serial or parallel connection and forming batteries.
During concrete enforcement, can be configured the discharge and recharge of storage battery and batteries, as shown in Figure 3,4, in above-mentioned photovoltaic system, the charging/discharging thereof of storage battery also comprises: by controlling the on-off of charge and discharge switch array breaker in middle able to programme, carry out series-connection charge-discharge to storage battery and batteries; Or parallel charge-discharge is carried out to storage battery and batteries.Concrete, following four kinds of pattern configurations can be realized: (1) charge mode; (2) discharge mode; (3) charge and discharge mode; (4) charge mode.
For above-mentioned charge mode, can realize carrying out serial or parallel connection charging to single storage battery or multiple storage battery by configuration, such as, shown in Fig. 5, storage battery Bat1 and storage battery Bat2 connects, storage battery Bat3 and storage battery Batn connects and forms parallel system, accepts supplementing of photovoltaic electric energy (PV) simultaneously.Also can by configuration, bypass battery module, carries out connection in series-parallel independent assortment, improves flexibility.
For above-mentioned discharge mode, during concrete enforcement, phenomenon is put in order to avoid crossing, discharged in series is carried out to storage battery and batteries, comprise: when detecting that current existence reaches storage battery or the batteries of overdischarge pressure, control the on-off of described charge and discharge switch array breaker in middle able to programme, bypass reaches storage battery or the batteries of overdischarge pressure.Such as, as shown in Figure 6, when storage battery or batteries reach overdischarge pressure, can by corresponding storage battery or the batteries reaching overdischarge pressure of configurating programmable charge and discharge switch array bypass.Corresponding storage battery or batteries can also be increased according to electrical energy demands, realize seamless switching and electric energy required for steady load.According to different electric pressure, carry out electric energy coupling, improve the flexibility of utilization rate of electrical and configuration.
For above-mentioned charge and discharge mode, when specifically implementing, as shown in Fig. 7 (a), 7 (b), discharge and recharge configuration can be realized simultaneously, make the storage battery or the batteries disengaging charge less state that are in charge less state for a long time, prolonging service life of battery.
During concrete enforcement, for above-mentioned charge mode, in order to avoid overcharging phenomenon, in the present embodiment, batteries is connected by multiple storage battery and is formed, batteries is charged, comprise: the charging voltage detecting each storage battery in batteries in real time, detect current when having the charging voltage of storage battery to reach default overcharged voltage, control the on-off of described charge and discharge switch array breaker in middle able to programme, bypass reaches the storage battery of default overcharged voltage and connects load, continue as other charge in batteries in batteries, until the charging voltage of all storage batterys reaches default overcharged voltage in batteries.
Concrete, such as, batteries is connected by multiple storage battery and is used, though the performance of single-unit storage battery more excellent, quality is good again, if each cell batteries characteristic that combo uses is inconsistent, the inner cell batteries of batteries all can be caused to overcharge and after to one's heart's content condition is seriously inconsistent.When any one battery characteristics worsens, damage causing the linksystem of other storage battery generation domino effect in batteries.Batteries quality is determined by the cell batteries that wherein quality is the poorest.Usual resistive load can realize electric voltage equalization, and capacitive or inductive load can realize capacity equilibrium, and in the present invention, involved load is resistive load.As shown in Figure 8, batteries serial connection charge pattern, when charging strategy of carrying in employing the present invention, when to detect cell batteries charging voltage be 2.4V (i.e. default overcharged voltage), thinks SOC=1.The SOH (battery health degree) of setting batteries cell batteries Bat3 and storage battery Bat1 is respectively 95% and 98%, and the SOH of all the other cell batteries is 100%.In charging process, first cell batteries Bat3 voltage reach 2.4V, for avoiding overcharging, now by configurating programmable charge and discharge switch array bypass Bat3, and connects load Load1, as shown in Figure 9; Continue in charging process, first cell batteries Bat1 voltage reach 2.4V, and equally, by configurating programmable charge and discharge switch array bypass Bat1, as shown in Figure 10, all the other cell batteries continue charging, when detecting voltage and reaching 2.4V, stops charging.
Certainly, be more than the preferred embodiment of the present invention.It should be pointed out that for those skilled in the art, under the prerequisite not departing from its general principles, can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (7)
1. the charging/discharging thereof of storage battery in photovoltaic system, is characterized in that, comprising:
Work as P
pv>P
loadtime, to preset maximum permission charging current, adopt the photovoltaic electric energy in photovoltaic system to charge to storage battery, wherein, P
pvfor photovoltaic cell capable of generating power power, P
loadfor bearing power;
When the charging voltage of described storage battery reaches default overcharged voltage, described default maximum permission charging current is linearly reduced to C/100, and continue to charge to described storage battery with the charging current of C/100, C is battery capacity;
When the charging voltage of described storage battery reaches described default overcharged voltage again, the state-of-charge of described storage battery is 1, stops charging to described storage battery.
2. the charging/discharging thereof of storage battery in photovoltaic system according to claim 1, is characterized in that, carry out charging comprise described storage battery:
Storage battery in photovoltaic system is divided into groups;
The photovoltaic electric energy in photovoltaic system is adopted to charge to storage battery and batteries.
3. the charging/discharging thereof of storage battery in photovoltaic system according to claim 2, is characterized in that, divided into groups by storage battery in photovoltaic system, comprising:
By controlling the on-off of programmable battery switch arrays breaker in middle, controlling multiple storage battery serial or parallel connection and forming batteries.
4. in the photovoltaic system according to any one of claim 2 to 3, the charging/discharging thereof of storage battery, is characterized in that, also comprises:
By controlling the on-off of charge and discharge switch array breaker in middle able to programme, series-connection charge-discharge is carried out to storage battery and batteries; Or parallel charge-discharge is carried out to storage battery and batteries.
5. the charging/discharging thereof of storage battery in photovoltaic system according to claim 4, is characterized in that, carry out discharged in series, comprising storage battery and batteries:
When detecting that current existence reaches storage battery or the batteries of overdischarge pressure, control the on-off of described charge and discharge switch array breaker in middle able to programme, bypass reaches storage battery or the batteries of overdischarge pressure.
6. the charging/discharging thereof of storage battery in photovoltaic system according to claim 3, is characterized in that, batteries is connected by multiple storage battery and formed, and charges, comprising batteries:
The charging voltage of each storage battery in real-time detection batteries, detect current when having the charging voltage of storage battery to reach default overcharged voltage, control the on-off of described charge and discharge switch array breaker in middle able to programme, bypass reaches the storage battery of default overcharged voltage and connects load, continue as other charge in batteries in batteries, until the charging voltage of all storage batterys reaches default overcharged voltage in batteries.
7. the charging/discharging thereof of storage battery in photovoltaic system according to claim 1, it is characterized in that, described storage battery is lead-acid battery.
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| CN201510925698.2A CN105576307B (en) | 2015-12-11 | 2015-12-11 | The charging/discharging thereof of accumulator in photovoltaic system |
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Cited By (2)
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| CN106532825A (en) * | 2016-11-21 | 2017-03-22 | 珠海格力电器股份有限公司 | Storage battery charging method and device |
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| CN105576307B (en) | 2018-06-22 |
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