CN105322868A - Solar synergistic energy system and method - Google Patents
Solar synergistic energy system and method Download PDFInfo
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- CN105322868A CN105322868A CN201410377780.1A CN201410377780A CN105322868A CN 105322868 A CN105322868 A CN 105322868A CN 201410377780 A CN201410377780 A CN 201410377780A CN 105322868 A CN105322868 A CN 105322868A
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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
Abstract
The invention provides a solar synergistic energy system and method. The solar synergistic energy system comprises a solar module, a photovoltaic inverter, a first selector switch, energy storage equipment, a second selector switch, a direct current converter, a third selector switch and a control host. In the case of low solar radiation, a plurality of solar panels of the solar module can charge the energy storage equipment with output tiny power; when the energy storage equipment is charged to a certain extent, electric energy stored by the energy storage equipment and tiny power output by the plurality of solar panels of the solar module are output together to the photovoltaic inverter, and therefore under the condition of low solar radiation, the photovoltaic inverter can provide the best solar conversion efficiency and the solar module can be operated at the maximum power output point.
Description
Technical field
The present invention is relevant a kind of solar energy synergy energy-storage system and method thereof, particularly a kind of when low solar radiation, enable photovoltaic DC-to-AC converter provide best sun energy conversion efficiency and enable the solar energy module interconnected by multiple solar panels operate in maximum power point (mpp).
Background technology
Tradition has the photovoltaic DC-to-AC converter (PV-Inverter) of maximum power tracing (MaximumPowerPointTracking) no matter be the voltage according to solar panels and current curve, and the optimum voltage arranged follows method (ConstantVoltageTracking/ModifiedConstantVoltageTracking), or the transfer power of standard progressively follows method, and (SteppingUp/DownAlgorithm) can be higher at solar radiant energy, or reach light when saying that solar panels output electric energy is larger, the requirement of electricity conversion maximal efficiency, but when solar panels work in low solar radiant energy, or during so-called underloading service area, often be limited to electrical power switching element (InsulatedGateBipolarTransistor, IGBT) minimum switch periods, and switching control system is for the control precision (ResolutionofPulseWidthModulation) of Pulse period, maximum power tracing device in photovoltaic DC-to-AC converter not only cannot calculate the suitable switches cycle exactly, and conduction losses (ConductingLoss) and switching losses (SwitchingLoss) during electrical power switching element operation itself is excessive, cause most photovoltaic DC-to-AC converters in the efficiency significantly landing of input power lower than the underloading service area of rated power less than 20%, more usually because solar panels are under the situation of low solar radiant energy, from in Fig. 1, for the efficiency curve of common photovoltaic DC-to-AC converter (SC500MX), when input power is less than 10% of rated power, transfer ratio significantly glides, with actual face, most photovoltaic DC-to-AC converter is when input power is less than 5% of rated power, the electric energy that solar panels provide, be not enough to allow photovoltaic DC-to-AC converter steady operation in minimum switching cycle (MinimumPWMDuty), after photovoltaic DC-to-AC converter starts, the electric energy provided due to solar panels is not enough, output voltage will be caused to decline, and lower than the minimum to photovoltaic DC-to-AC converter, electrical power so owing to exporting is not enough to allow photovoltaic DC-to-AC converter normal operation, photovoltaic DC-to-AC converter will be forced to enter halted state again, add photovoltaic DC-to-AC converter to beat between startup and cut-off, thus can accelerate the life consumption of photovoltaic DC-to-AC converter.
Therefore general solar plant is the life-span avoiding a little electric energy income under low solar radiation to undermine photovoltaic DC-to-AC converter, and reduce the not expected total harmonic distortion (TotalHarmonicDistortion) of photovoltaic DC-to-AC converter ac output end, many meetings install timer additional at the input port of photovoltaic DC-to-AC converter, with get rid of early morning or at dusk time the interference of low solar radiant energy.
But the design installing timer additional not only detracts due generating gross power, more cannot under the situation that weather is not good, such as overcast and rainy, or under the weather having a mist, protection photovoltaic DC-to-AC converter, ensure generating quality, avoid the interference during generating of solar panels underloading.
And the modular design architecture of the Huawei Tech Co., Ltd of the FroniusInternational in Australia and inland of China employing simultaneously, utilize the maximum power tracing module that many groups are miniaturized, according to the possible maximum electric power that solar panels export, switch corresponding maximum power tracing module quantity in turn, no matter solar panels are in underloading or full load, reach whole group of photovoltaic DC-to-AC converter and can work in efficient, stable state.But the maximum power tracing module of FronuisInternational only has 5KW, although provide good generating efficiency under low solar radiation condition, but be limited to power scale and be not suitable for large-sized photovoltaic electricity generation system, and under the operation of the maximum power tracing module of many group miniaturizations, many shared elements, as switch electric brake, DC filter, PWM control assembly can increase much extra cost;
And the maximum power module of Huawei Tech Co., Ltd is 250KW, single-machine capacity is 500KW, use many group 500KW machines according to intensity of solar radiation, the unit quantity of decision work, having a vast territory because of solar panels is understood in electric power conveying, complicated distribution, the switching losses of electric brake, and the difficulty of solar panels characteristics match, reduce actual converted efficiency.
And Huawei Tech Co., Ltd will have carried out relatively large test the end of the year 2013 plans, the results show is with tandem electricity generation system formed by the low profile photovoltaic inverter 200 groups of 20KW, still compared with 500KW photovoltaic DC-to-AC converter 8 groups actual light photoelectric transformation efficiency come high by 3.04%, if but under the condition of low solar radiant energy (17:10 in afternoon), even conversion efficiency difference 40.85%.Solar panels are in mating bad when, maximum power tracing module only can operate in the maximum power point under trading off, reduce to making the usefulness of maximum power tracing module, it can thus be appreciated that, large-scale solar panels configuration can control the photovoltaic DC-to-AC converter of working quantity, and being still cannot effectively by low solar radiant energy income electricity generation system.
In addition, from Fig. 2 A, 2B, when solar panels are when finishing whole pairing according to photovoltaic conversion efficiency and photovoltaic electric kinetic potential completely, all solar panels cannot reach best photovoltaic conversion efficiency under identical condition of work simultaneously, but relatively compromise optimal point of operation, therefore thus solar panels whole efficiency declines.It can thus be appreciated that when the quantity of solar panels is larger, the situation of this conversion efficiency drop is more obvious.
Therefore, if when low solar radiation state, exported small electric power is charged to this energy storage device by multiple solar panels, and in being charged to a certain degree, again by small electric power that the electric energy stored by this energy storage device and multiple solar panels export, export photovoltaic DC-to-AC converter in the lump, to make under low solar radiation state, this photovoltaic DC-to-AC converter can provide best sun energy conversion efficiency and enable this solar modules operate in maximum power point (mpp), so should be a best solution.
Summary of the invention
The object of the present invention is to provide a kind of solar energy synergy energy-storage system and method thereof, can when low solar radiation state, exported small electric power is charged to this energy storage device by multiple solar panels, and in being charged to a certain degree, again by small electric power that the electric energy stored by this energy storage device and multiple solar panels export, export photovoltaic DC-to-AC converter in the lump, to make under low solar radiation state, photovoltaic DC-to-AC converter can provide best sun energy conversion efficiency and enable this solar energy module operate in maximum power point (mpp).
For achieving the above object, the invention discloses a kind of solar energy synergy energy-storage system, it is characterized in that comprising:
One solar energy module, is interconnected by multiple solar panels and forms;
One photovoltaic DC-to-AC converter, is connected with this solar energy module, and the electric power in order to be produced by this solar energy module is converted to voltage identical with civil power and frequency;
One first diverter switch, is arranged between this solar energy module and this photovoltaic DC-to-AC converter;
One energy storage device, be connected with this solar energy module, and this energy storage device system is formed by multiple battery unit serial connection, and in each battery unit, contain several battery and several monitoring module, wherein this energy storage device is in order to store this photovoltaic DC-to-AC converter the electric power that the solar energy module under low year operating condition exports;
One second diverter switch, is arranged between this solar energy module and this energy storage device;
One direct current transducer, is connected with energy storage device, and this direct current transducer is one is the electric power converter close with the optimum operating voltage of the solar panels of this solar energy module by the electric power boost conversion of this energy storage device;
One the 3rd diverter switch, is arranged between this energy storage device and direct current transducer;
One main control system, contain a central control unit, this central control unit and this first diverter switch, second diverter switch, 3rd diverter switch, solar energy module, direct current transducer and energy storage device are connected, under wherein this central control unit judges that electric power that this solar energy module exports makes this photovoltaic DC-to-AC converter be in low year operating condition, then open this second diverter switch, to enable solar energy module produced electric power inputted in this energy storage device and charge, and be charged to a certain degree in this energy storage device, this central control unit can control the 3rd diverter switch and be communicated with, the solar energy module wherein enabling this photovoltaic DC-to-AC converter be under low year operating condition exports produced electric power to this photovoltaic DC-to-AC converter, and this energy storage device can discharge in the lump, to export electric power to this photovoltaic DC-to-AC converter through this direct current transducer.
Wherein, the electric energy information of this battery storage can be back to this central control unit by the monitoring module of this battery unit, this energy storage device can determine voltage tracking pattern with approximate, is in the electric power that the solar energy module under low year operating condition exports stores making this photovoltaic DC-to-AC converter.
Wherein, this central control unit can control this direct current transducer be in temperature adjustmemt determine voltage follow the trail of pattern, provide best sun energy conversion efficiency to enable this direct current transducer and enable this solar energy module operate in maximum power point (mpp).
Wherein, this direct current transducer is the transducer of isolated form.
Wherein, in this direct current transducer, there is DC voltage converting circuit, in order to this energy storage device is carried out discharge to export the voltage of this photovoltaic DC-to-AC converter to padded.
Also disclose a kind of solar energy synergy energy storage method, it is characterized in that step is:
When low solar radiation, the small electric power that multiple solar panels of a solar energy module export is charged to an energy storage device;
Again by small electric power that multiple solar panels of the electric energy stored by this energy storage device and this solar energy module export, export a photovoltaic DC-to-AC converter in the lump to, to make under low solar radiation state, photovoltaic DC-to-AC converter is enable to provide best sun electric energy conversion work voltage and enable this solar energy module operate in maximum power point (mpp).
Wherein, under low solar radiation refers to that small electric power that this solar energy module exports makes this photovoltaic DC-to-AC converter be in low year operating condition, and this low year operating condition refers to that this solar energy module inputs the steady operation power of input power lower than this photovoltaic DC-to-AC converter of this photovoltaic DC-to-AC converter.
Wherein, when low solar radiation, this energy storage device can follow the trail of pattern to determine voltage, and the small electric power exported by this solar energy module stores.
Wherein, when low solar radiation, this solar energy module can export produced small electric power to photovoltaic DC-to-AC converter and this energy storage device can carry out discharging to export electric power to photovoltaic DC-to-AC converter through a direct current transducer in the lump, and this direct current transducer can be set as following the trail of pattern with the voltage of determining of temperature adjustmemt, provide best sun energy conversion efficiency to enable photovoltaic DC-to-AC converter and enable this solar energy module operate in maximum power point (mpp).
Wherein, in this direct current transducer, cording has direct voltage to change the mechanism, in order to this energy storage device is carried out discharge to export the voltage of photovoltaic DC-to-AC converter to padded, to compensate the voltage differences of this energy storage device between charge and discharge.
By foregoing, present invention achieves following technique effect:
1. the present invention can when low solar radiation state, exported small electric power is charged to this energy storage device by multiple solar panels, and in being charged to a certain degree, again by small electric power that the electric energy stored by this energy storage device and multiple solar panels export, export photovoltaic DC-to-AC converter in the lump, to make under low solar radiation state, this direct current transducer can provide best sun electric energy conversion work voltage and enable solar energy module operate in maximum power point (mpp).
2. the present invention can avoid photovoltaic DC-to-AC converter inefficient district of (<10%) when underloading, photovoltaic DC-to-AC converter is avoided to operate in out the discontinuous operation of open and close pass, simultaneously by low solar radiation energy to be undertaken in original electricity generation system more than 90% efficiency, promote overall photovoltaic efficiency.In the application of reality, the total capacity of energy storage device only needs the solar panels maximum generating watt of a hour of 10 ~ 20%, the power of a direct current power booster system of putting more lower than 2%, therefore have the benefit of development.
Accompanying drawing explanation
Fig. 1: the efficiency curve schematic diagram commonly using photovoltaic DC-to-AC converter.
Fig. 2 A and 2B: commonly use solar panels cannot finish whole pairing schematic diagram according to photovoltaic conversion efficiency and photovoltaic electric kinetic potential.
Fig. 3 A: the overall architecture schematic diagram of solar energy synergy energy-storage system of the present invention and method thereof.
Fig. 3 B: the cell internal configuration diagram of solar energy synergy energy-storage system of the present invention and method thereof.
Fig. 4: the lithium system battery charging curve schematic diagram of solar energy synergy energy-storage system and method thereof.
Fig. 5: the energy storage of solar energy synergy energy-storage system of the present invention and method thereof supplies to anticipate electric energy schematic diagram with electric discharge.
Fig. 6: the schematic flow sheet of solar energy synergy energy-storage system of the present invention and method thereof.
Fig. 7: the isolation boosting schematic diagram of solar energy synergy energy-storage system of the present invention and method thereof.
Fig. 8 A: the enforcement illustration of solar energy synergy energy-storage system of the present invention and method thereof.
Fig. 8 B: the enforcement illustration of solar energy synergy energy-storage system of the present invention and method thereof.
Embodiment
Have about other technologies content of the present invention, feature and effect, in the detailed description of following cooperation with reference to graphic preferred embodiment, can clearly present.
Refer to Fig. 3 A and Fig. 3 B, for overall architecture schematic diagram and the cell internal configuration diagram of solar energy synergy energy-storage system of the present invention and method thereof, from in figure, this solar energy synergy energy-storage system, comprise a solar energy module 1, one photovoltaic DC-to-AC converter 6, one first diverter switch 31, one energy storage device 4, one second diverter switch 32, one direct current transducer 2 with DC voltage converting circuit 21, one the 3rd diverter switch 33 and a main control system 5, wherein this solar energy module 1 is interconnected by multiple solar panels 11 and forms, and this solar energy module 1 can be connected with this photovoltaic DC-to-AC converter 6, with when this first diverter switch 31 is in the state of conducting (on), the electric power that this solar energy module 1 produces can be converted to voltage identical with civil power and frequency by this photovoltaic DC-to-AC converter 6,
And this energy storage device 4 is connected with this solar energy module 1 and this direct current transducer 2, wherein be situated between this energy storage device 4 and this solar energy module 1 and be connected to this second diverter switch 32, be situated between energy storage device 4 and this direct current transducer 2 and be connected to the 3rd diverter switch 33, and this energy storage device 4 is formed by multiple battery unit 41 serial connection, several battery 411 and several monitoring module 412 be connected with this battery 411 is contained in each battery unit 41, wherein this energy storage device 4 is in order to store the electric power making this photovoltaic DC-to-AC converter 6 be in the solar energy module 1 under low year operating condition to export,
This main control system 5 is the computing host of a technical grade in addition, and this main control system 5 contains a central control unit 51, this central control unit 51 and this solar energy module 1, this first diverter switch 31, this energy storage device 4, this second diverter switch 32, this direct current transducer 2, 3rd diverter switch 33 is connected, under wherein this central control unit 51 can judge whether electric power that this solar energy module 1 exports makes this photovoltaic DC-to-AC converter 6 be in low year operating condition, wherein low year operating condition refer to input power that this solar energy module 1 inputs this photovoltaic DC-to-AC converter 6 lower than this photovoltaic DC-to-AC converter 6 rated power less than 10%, but it is then optimum that this place describes percentage, more can fit situation adjustment percentage.
As shown in Figure 4, because the battery 411 of battery unit 41 of the present invention uses lithium battery, from in figure, single crosstalk pressure is between 3.0 ~ 4.2V, the charging voltage of ferric phosphate lithium cell is almost determine voltage (3.35 ~ 3.55V), and the operating voltage of the optimal conversion efficiency of the solar panels of current all volume productions is also almost fixed.
When this central control unit 51 (or this photovoltaic DC-to-AC converter 6 be in low year operating condition under) under solar energy module 1 is in low solar radiation state, because the electric energy information that this battery 411 stores can be back to this central control unit 51 by the monitoring module 412 of this battery unit 41, therefore this central control unit 51 can judge this electric energy stored by energy storage device 4 whether lower than this energy storage device electric energy total capacity less than 90% time, if lower than less than 90%, then can control the second diverter switch 32 conducting (on), pattern (ConstantVoltageTrackingmode) can be followed the trail of to determine voltage to make this energy storage device 4 (being made up of ferric phosphate lithium cell), the electric power (electric power of solar energy-electric energy conversion) being in the solar energy module under low year operating condition by making this photovoltaic DC-to-AC converter 6 and exporting stores.
When this central control unit 51 (or this photovoltaic DC-to-AC converter 6 be in low year operating condition under) under solar energy module 1 is in low solar radiation state, and when judging that this electric energy stored by energy storage device 4 reaches more than 90% of the electric energy total capacity of this energy storage device 4 simultaneously, then can control the second diverter switch 32 to close (off), and make this first diverter switch 31 and the 3rd diverter switch 33 conducting (on), produced electric power can be exported to this photovoltaic DC-to-AC converter 6 by the solar energy module 1 that therefore this photovoltaic DC-to-AC converter 6 is under low year operating condition, and this energy storage device 4 can carry out discharging electric power to be exported to this direct current transducer 2 in the lump, and via this direct current transducer 2 pad high-tension after, produced electric power can be together exported to this photovoltaic DC-to-AC converter 6 with solar energy module 1.
Above-mentioned pattern then can be maintained to following two kinds of situations and then can change:
1. when this electric energy stored by energy storage device 4 reaches less than 10% of the electric energy total capacity of this energy storage device 4, this central control unit 51 can control the first diverter switch 31 and the 3rd diverter switch 33 is closed (off) and makes this first diverter switch 32 conducting (on), and the electric power (electric power of solar energy-electric energy conversion) making this photovoltaic DC-to-AC converter 6 be in the solar energy module under low year operating condition to export stores.
2. this solar energy module 1 is non-be in low solar radiation state under (or this photovoltaic DC-to-AC converter 6 is non-be in low year operating condition under) time, wherein this central control unit 51 can control the second diverter switch 32 and the 3rd diverter switch 33 is closed (off) and makes this first diverter switch 31 conducting (on)
From in Fig. 5, and the electric energy of the gained that charges, after discharging, when although the solar panels of solar energy module 1 are under low solar radiation state, be to provide faint electric power, but after discharging via this energy storage device 4, this photovoltaic DC-to-AC converter 6 can be made can to avoid inefficient service area, and due to this central control unit 51 can control direct current transducer 2 be in temperature adjustmemt determine voltage follow the trail of pattern (ModifiedConstantVoltageTrackingmode), therefore, it is possible to make direct current transducer 2 can provide best sun electric energy conversion work voltage, and make this solar energy module 1 operate in maximum power point (mpp).
And solar energy synergy energy storage method of the present invention, as shown in Figure 6, its method is:
1., when low solar radiation, the small electric power that multiple solar panels of a solar energy module export is carried out charging 601 to an energy storage device;
2. again by small electric power that multiple solar panels of the electric energy stored by this energy storage device and this solar energy module export, export a photovoltaic DC-to-AC converter in the lump to, to make under low solar radiation state, this photovoltaic DC-to-AC converter can provide best sun electric energy conversion work voltage and enable solar energy module operate in maximum power point (mpp) 602.
In addition, as shown in Figure 7, position due to the charge and discharge of this energy storage device 4 is accurate different, therefore electric discharge to be directly used in the small electric power produced with this solar energy module 1 and connect output, problem will be had, but the present invention utilizes the mode of the isolation boosting of power electronics, as shown in Figure 3A, owing to there is DC voltage converting circuit 21 in this direct current transducer 2, therefore this energy storage device 4 can be carried out discharging to export the voltage of this direct current transducer 2 to padded, with the gap of the charging voltage and discharge voltage that compensate battery 411 (lithium phosphate is ferroelectric), more because the electric energy information that this battery 411 stores can be back to this central control unit 51 by the monitoring module 412 of this battery unit 41, therefore can the output voltage of this energy storage device 4 of dynamic conditioning and electric current,
Therefore, as shown in Figure 7, when the small electric power that energy storage device 4 will produce with this solar energy module 1 and when connecing output, this central control unit 51 can control this direct current transducer 2 work in temperature adjustmemt determine voltage follow the trail of pattern (ModifiedConstantVoltageTrackingmode)
In addition, in order to consider electric energy conversion after can safely superposition on the voltage of energy storage device, this direct current transducer 2 must use isolated form, such as direction flyback converter (Fly-backconverter), forward converter (Forwardconverter), cuk transducer, SEPIC transducer.
The standard configuration of current solar plant; majority is with 20 ~ 21 strings; the photovoltaic panel of 245 ~ 255W is concatenated into the basic square formation of 600 ~ 630V/8A; direct current conflux case is connected to again with 15 ~ 16 strings; and then be connected in DC power distribution cabinet with 7 ~ 8 cabinets that conflux; and establish current-limiting protection switch in DC power distribution cabinet is in-built, avoid the accident of outside wiring short circuit, after access the isolated DC transducer of 500KW again.
And the invention process application is as shown in Fig. 8 A and Fig. 8 B, due to reality, effective battery storage system is the battery system of 50 ~ 60KWh.If suppose, the basic square formation of solar energy module 1 is that 21 strings 96 solar panels 11 also form, battery 411 wherein for energy storage uses iron lithium phosphate battery, then the string number of ferric phosphate lithium cell should between 168 ~ 176 strings, for considering the life-span of ferric phosphate lithium cell and the operating temperature of solar panels reality, then adopt 176 string phosphoric acid electricity lithium batteries, be divided into the battery unit 41 of 11 groups, and in the battery unit 41 of each group, have the battery 411 (50V/5KWh) of 16 strings/100Ah, then 11 groups of modules are connected in series again, therefore then can form the phosphoric acid electricity lithium battery of 176 serial connections.
Owing to there is monitoring module 412 in each battery unit 41, in order to monitor the state of this battery 411 (iron lithium phosphate battery), and direct current transducer 2 of the present invention is the direct current transducer (controllable voltage of a 8KW/96V/80A, electric current exports, the direct current transducer entered), this central control unit 51 can control this isolated DC transducer 2, and carry out adjusting cell system voltage when discharging and electric current for this energy storage device 4, and by battery system information, by this main control system 5 according to environmental monitoring data, commander and tell off electric current and voltage in this controllable voltage, the direct current transducer of electric current.
Solar energy synergy energy-storage system provided by the present invention and method thereof, when mutually comparing with other located by prior art, its advantage is as follows:
1. the present invention can when low solar radiation state, exported small electric power is charged to this energy storage device by multiple solar panels, and in being charged to a certain degree, again by small electric power that the electric energy stored by this energy storage device and multiple solar panels export, export photovoltaic DC-to-AC converter in the lump, to make under low solar radiation state, this direct current transducer can provide best sun electric energy conversion work voltage and enable solar energy module operate in maximum power point (mpp).
2. the present invention can avoid photovoltaic DC-to-AC converter inefficient district of (<10%) when underloading, photovoltaic DC-to-AC converter is avoided to operate in out the discontinuous operation of open and close pass, simultaneously by low solar radiation energy to be undertaken in original electricity generation system more than 90% efficiency, promote overall photovoltaic efficiency.In the application of reality, the total capacity of energy storage device only needs the solar panels maximum generating watt of a hour of 10 ~ 20%, the power of a direct current power booster system of putting more lower than 2%, therefore have the benefit of development.
3. the present invention discloses as above through the above embodiments; so itself and be not used to limit the present invention; anyly be familiar with this technical field and have and usually know the knowledgeable; in the understanding aforesaid technical characteristic of the present invention and embodiment; and without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore scope of patent protection of the present invention must be as the criterion depending on the claim person of defining appended by this specification.
Claims (10)
1. a solar energy synergy energy-storage system, is characterized in that comprising:
One solar energy module, is interconnected by multiple solar panels and forms;
One photovoltaic DC-to-AC converter, is connected with this solar energy module, and the electric power in order to be produced by this solar energy module is converted to voltage identical with civil power and frequency;
One first diverter switch, is arranged between this solar energy module and this photovoltaic DC-to-AC converter;
One energy storage device, be connected with this solar energy module, and this energy storage device system is formed by multiple battery unit serial connection, and in each battery unit, contain several battery and several monitoring module, wherein this energy storage device is in order to store this photovoltaic DC-to-AC converter the electric power that the solar energy module under low year operating condition exports;
One second diverter switch, is arranged between this solar energy module and this energy storage device;
One direct current transducer, is connected with energy storage device, and this direct current transducer is one is the electric power converter close with the optimum operating voltage of the solar panels of this solar energy module by the electric power boost conversion of this energy storage device;
One the 3rd diverter switch, is arranged between this energy storage device and direct current transducer;
One main control system, contain a central control unit, this central control unit and this first diverter switch, second diverter switch, 3rd diverter switch, solar energy module, direct current transducer and energy storage device are connected, under wherein this central control unit judges that electric power that this solar energy module exports makes this photovoltaic DC-to-AC converter be in low year operating condition, then open this second diverter switch, to enable solar energy module produced electric power inputted in this energy storage device and charge, and be charged to a certain degree in this energy storage device, this central control unit can control the 3rd diverter switch and be communicated with, the solar energy module wherein enabling this photovoltaic DC-to-AC converter be under low year operating condition exports produced electric power to this photovoltaic DC-to-AC converter, and this energy storage device can discharge in the lump, to export electric power to this photovoltaic DC-to-AC converter through this direct current transducer.
2. solar energy synergy energy-storage system as claimed in claim 1, it is characterized in that, the electric energy information of this battery storage can be back to this central control unit by the monitoring module of this battery unit, this energy storage device can determine voltage tracking pattern with approximate, is in the electric power that the solar energy module under low year operating condition exports stores making this photovoltaic DC-to-AC converter.
3. solar energy synergy energy-storage system as claimed in claim 1, it is characterized in that, this central control unit can control this direct current transducer be in temperature adjustmemt determine voltage follow the trail of pattern, provide best sun energy conversion efficiency to enable this direct current transducer and enable this solar energy module operate in maximum power point (mpp).
4. solar energy synergy energy-storage system as claimed in claim 1, it is characterized in that, this direct current transducer is the transducer of isolated form.
5. solar energy synergy energy-storage system as claimed in claim 1, is characterized in that having DC voltage converting circuit in this direct current transducer, in order to this energy storage device is carried out discharge to export the voltage of this photovoltaic DC-to-AC converter to padded.
6. a solar energy synergy energy storage method, is characterized in that step is:
When low solar radiation, the small electric power that multiple solar panels of a solar energy module export is charged to an energy storage device;
Again by small electric power that multiple solar panels of the electric energy stored by this energy storage device and this solar energy module export, export a photovoltaic DC-to-AC converter in the lump to, to make under low solar radiation state, photovoltaic DC-to-AC converter is enable to provide best sun electric energy conversion work voltage and enable this solar energy module operate in maximum power point (mpp).
7. solar energy synergy energy storage method as claimed in claim 6, it is characterized in that, under low solar radiation refers to that small electric power that this solar energy module exports makes this photovoltaic DC-to-AC converter be in low year operating condition, and this low year operating condition refers to that this solar energy module inputs the steady operation power of input power lower than this photovoltaic DC-to-AC converter of this photovoltaic DC-to-AC converter.
8. solar energy synergy energy storage method as claimed in claim 6, is characterized in that, when low solar radiation, this energy storage device can follow the trail of pattern to determine voltage, and the small electric power exported by this solar energy module stores.
9. solar energy synergy energy storage method as claimed in claim 6, it is characterized in that, when low solar radiation, this solar energy module can export produced small electric power to photovoltaic DC-to-AC converter and this energy storage device can carry out discharging to export electric power to photovoltaic DC-to-AC converter through a direct current transducer in the lump, and this direct current transducer can be set as following the trail of pattern with the voltage of determining of temperature adjustmemt, provide best sun energy conversion efficiency to enable photovoltaic DC-to-AC converter and enable this solar energy module operate in maximum power point (mpp).
10. solar energy synergy energy storage method as claimed in claim 9, it is characterized in that, in this direct current transducer, there is direct voltage to change the mechanism, in order to this energy storage device is carried out discharge to export the voltage of photovoltaic DC-to-AC converter to padded, to compensate the voltage differences of this energy storage device between charge and discharge.
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