CN102611355B - A kind of photovoltaic array conflux box - Google Patents
A kind of photovoltaic array conflux box Download PDFInfo
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Abstract
The invention provides a kind of photovoltaic array conflux box, comprise multi-channel DC input branch road, conflux into a road direct current after its parallel connection to export, every road branch road all possesses maximal power tracing function, every road branch road is made all to be operated in respective maximum power point place, described header box also comprises multiple voltage compensation units of connecting with each branch road respectively, and compare computing unit, the described computing unit that compares is for comparing the maximum of the maximum power point place voltage drawing each branch road, then the difference of described maximum and each maximum power point place magnitude of voltage is calculated respectively, and described difference is exported respectively to voltage compensation unit place corresponding to each branch road, described voltage compensation unit is used for carrying out voltage compensation according to described difference to the branch road of its correspondence, and the output voltage values of Shi Gai road branch road equals described maximum.Photovoltaic array conflux box of the present invention can ensure that each branch road still can export with respective maximum power after output of confluxing, and makes the gross output of this header box reach maximum.
Description
Technical field
The invention belongs to technical field of photovoltaic power generation, be specifically related to a kind of photovoltaic array conflux box.
Background technology
Along with starting of parallel network power generation technology, for fairly large grid-connected photovoltaic system, in order to reduce the connecting line between photovoltaic module (solar cell) and combining inverter, maintain easily, photovoltaic array direct current collector-shoe gear (i.e. photovoltaic array conflux box) need be increased between photovoltaic module and combining inverter, its effect the photovoltaic array of some (solar cell tandem) is confluxed into a road direct current to export, and is then transfer to electric power transmission network after alternating current by the DC inverter after described confluxing by combining inverter.
In order to improve the whole efficiency of grid-connected photovoltaic system, existing photovoltaic combining inverter generally has maximal power tracing (MPPT, Maximum Power PointTracking) function, for the input power to described inverter, namely the power output of photovoltaic array conflux box carries out maximal power tracing.But large-scale photovoltaic grid-connected system is all made up of high-power combining inverter, it is for carrying out inversion (such as to the numerous roads photovoltaic array imported, 500KW combining inverter is generally used for 70 tunnels to importing, the photovoltaic array of every road 10A carries out inversion), and high-power photovoltaic synchronization inverter can only carry out maximal power tracing to total output of the photovoltaic array of all remittance, and maximal power tracing cannot be carried out to each branch road of photovoltaic array, that is the gross power that the maximal power tracing function of described inverter can only realize header box exports is followed the tracks of, its maximum power point traced into is a mean value, although this maximum power tracking method has certain effect to the utilance improving solar energy, but for each branch road of photovoltaic array of input header box, there is batch manufacturing variation in the photovoltaic module manufactured due to photovoltaic module manufacturer, light differential etc. is there is between photovoltaic module, the peak power output point making each photovoltaic array branch road is different, if each branch road of photovoltaic array is all by gross output (i.e. average maximum power) work that combining inverter traces into, some photovoltaic array branch road then can be made not to be operated in the maximum power point place of this branch road, the utilance of the solar energy in photovoltaic generating system is made not reach maximum.
For above problem, prior art also been proposed the method that multiple each input branch road to photovoltaic array conflux box (namely importing each branch road of photovoltaic array of header box) carries out maximal power tracing, for carrying out maximal power tracing respectively to each input branch road, each input branch road is made all to be operated in respective maximum power point place.Such as by adding the method for DC/DC boost module respectively to realize the maximal power tracing of each input branch road in each input branch road, described DC/DC boost module can adopt existing Boost circuit, it comprises switching tube and energy storage inductor, the magnitude of voltage at the maximal power tracing point place that each input branch road traces into according to it, adopt Boost circuit the output voltage of each input branch road to be boosted to the magnitude of voltage at the maximum power point place of this branch road respectively, thus each input branch road is exported with maximum power.
But in fact, be no matter adopt in each input branch road, to add DC/DC boost module respectively and each input branch road maximum power tracking method of realizing, still adopt other each input branch road maximum power tracking method, still there are the following problems:
Because the maximum power point of each input branch road is not identical, if make each input branch road all be operated in respective maximum power point place by existing each input branch road maximum power tracking method, then respectively input branch road after the bus-bar Parallel opertation in header box, due to the integrated value that the magnitude of voltage (i.e. d-c bus voltage value) on bus-bar is the input branch voltage of all parallel connections, also just the operating voltage of each input branch road is made to become magnitude of voltage on bus-bar, instead of respectively input the magnitude of voltage at the original maximum power point place of branch road, therefore the power output that header box respectively inputs branch road does not reach maximum, thus cause the gross output of header box also cannot reach maximum.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned defect existing in prior art, a kind of photovoltaic array conflux box is provided, this header box respectively inputs branch road at it and all has on the basis of maximal power tracing function, each input branch road still can be exported with maximum power after confluxing, efficiently solve because header box respectively inputs the maximum power point difference of branch road and make the power output of each input branch road cannot reach maximum problem after confluxing.
The technical scheme that solution the technology of the present invention problem adopts is:
Described photovoltaic array conflux box comprises multi-channel DC input branch road, conflux into a road direct current after described multi-channel DC input branch circuit parallel connection to export, every road direct current input branch road all possesses maximal power tracing function, every road direct current input branch road is made all to be operated in respective maximum power point place, described header box also comprises the multiple voltage compensation units inputting branch road respectively with described multi-channel DC and connect, and compare computing unit
The described computing unit that compares is for comparing the maximum drawing direct current input branch road maximum power point place, each road voltage, then calculate the difference that the maximum of described voltage and each road direct current input the maximum power point place magnitude of voltage of branch road respectively, and described difference is exported respectively to voltage compensation unit place corresponding to each road direct current input branch road;
The quantity of described voltage compensation unit is equal with the quantity that direct current inputs branch road, and for carrying out voltage compensation according to the direct current input branch road of described difference to its correspondence, the output voltage values of Shi Gai road direct current input branch road equals the maximum of described voltage.
Preferably, the described computing unit that compares comprises comparison module and computing module,
The output that input and the described multi-channel DC of described comparison module input branch road is connected, compare and analysis for inputting the maximum power point place voltage obtained after branch road carries out maximal power tracing respectively to described multi-channel DC, show that wherein maximum to be confluxed the d-c bus voltage value exported as this header box, and the maximum power point place magnitude of voltage described d-c bus voltage value and each road direct current being inputted branch road exports computing module in real time;
The output of described computing module is connected with described multiple voltage compensation unit, input the difference of the maximum power point place magnitude of voltage of branch road for calculating described d-c bus voltage value and each road direct current, and described difference is exported respectively to voltage compensation unit place corresponding to each road direct current input branch road.
Preferably, described each voltage compensation unit includes voltage regulating module and control module,
Described control module is connected with the computing module compared in computing unit, controls voltage regulating module export the magnitude of voltage equal with described difference for the difference corresponding according to this voltage compensation unit.
Further preferably, described voltage regulating module comprises the first switching tube, second switch pipe, inductance and electric capacity,
The described drain electrode of the first switching tube is connected with the electrode input end of this voltage regulating module, the source electrode of the first switching tube is connected with the drain electrode of second switch pipe, the drain electrode of second switch pipe is connected with the negative input of this voltage regulating module, the input of described inductance is connected with the series connection node of second switch pipe with the first switching tube, the output of inductance is connected with the negative pole of electric capacity, the positive pole of electric capacity is connected with the drain electrode of the first switching tube, and the output positive and negative charge of this voltage regulating module is connected with the both positive and negative polarity of electric capacity respectively;
The magnitude of voltage that described control module regulates described voltage regulating module to export by the duty cycle of switching controlling the first switching tube and second switch pipe, makes this magnitude of voltage equal with described difference.
Preferably, described voltage compensation unit also comprises inversion module, voltage reduction module and rectification module,
The output that the direct current that the input of described inversion module is corresponding with this voltage compensation unit inputs branch road is connected, for being alternating current by the DC inverter of this branch road of input;
The input of described voltage reduction module is connected with the output of inversion module, for carrying out step-down to described alternating current;
The input of described rectification module is connected with the output of voltage reduction module, for the AC rectification after described step-down is become unidirectional pulsating nature direct current;
The input of described voltage regulating module is connected with the output of rectification module, for using described unidirectional pulsating nature direct current as power supply and according to control module export control signal carry out pressure regulation.
Further preferably, described inversion module adopts inverter circuit; Described rectification module adopts rectification circuit; Described voltage reduction module adopts isolating transformer.
Preferably, described header box also comprises multiple first circuit protection unit, and its output being connected on each road direct current input branch road respectively inputs between voltage compensation unit corresponding to branch road with each road direct current, for carrying out overcurrent protection to this header box.
Further preferably, described first circuit protection unit adopts fuse.
Preferably, described header box also comprises second circuit protected location, and it is connected with the output of described header box, for transshipping and short-circuit protection to this header box.
Further preferably, described second circuit protected location adopts DC circuit breaker.
Beneficial effect:
Photovoltaic array conflux box of the present invention all has on the basis of maximal power tracing function at its each direct current input branch road, by a voltage compensation unit of all connecting on every road direct current input branch road, for compensating the difference that this road direct current input branch road maximum power point place's voltage and header box conflux between the DC bus-bar voltage that exports, every road direct current input branch road still can be exported with maximum power after confluxing, and the maximum power point place voltage of the branch road of each road direct current input originally changes by the DC bus-bar voltage exported that can not cause because the maximum power point place voltage of each road direct current input branch road is different confluxing, thus make the gross output of this header box reach maximum, effectively improve the whole efficiency of grid-connected photovoltaic system.
Detect known through reality, adopt the loss late not possessing the grid-connected photovoltaic system of maximal power tracing function photovoltaic array conflux box up to 3%, adopt the existing loss late with the grid-connected photovoltaic system of maximal power tracing function photovoltaic array conflux box to be reduced to 2%, and adopt the loss late of the grid-connected photovoltaic system of photovoltaic array conflux box of the present invention to only have about 1%.
Be more or less the same between maximum power point place voltage due to each road direct current input branch road of header box of the present invention, also just lower to the requirement of the power output of the voltage compensation unit be connected on each road direct current input branch road, therefore described voltage compensation unit can to pressure regulation again after the first step-down of this branch road (as by the voltage step-down rectification of several hectovolts on this branch road being the voltage of tens volts, pressure regulation is carried out again) for the voltage of described tens volts, make the switching tube in voltage regulating module and inductance, the operating voltage of electric capacity and operating current are all very little, therefore thermal losses in this voltage compensation unit circuit is very little, simplify the Thermal structures design of this voltage compensation unit circuit and the type selecting of device.
Accompanying drawing explanation
Fig. 1 is the structural representation of photovoltaic array conflux box in the embodiment of the present invention 1;
Fig. 2 is the connection diagram comparing computing unit and voltage compensation unit in Fig. 1;
Fig. 3 is the circuit theory schematic diagram of voltage compensation unit in the embodiment of the present invention 1;
Fig. 4 is the circuit theory schematic diagram of photovoltaic array conflux box in the embodiment of the present invention 1;
Fig. 5 is the control flow schematic diagram of photovoltaic array conflux box in the embodiment of the present invention 1.
Embodiment
For making those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, photovoltaic array conflux box of the present invention is described in further detail.
Embodiment 1:
As shown in Figure 1, described photovoltaic array conflux box comprises multi-channel DC input branch road, multiple voltage compensation unit and compares computing unit.Wherein, described every road direct current input branch road all possesses maximal power tracing function.Here, described direct current input branch road possesses maximal power tracing function and existing each input branch road at photovoltaic array conflux box can be adopted to add DC/DC boost module respectively to realize, and other the module that can realize maximal power tracing function can certainly be adopted to realize.
Conflux into a road direct current after described multi-channel DC input branch circuit parallel connection to export, bus-bar can be adopted the Cheng Yilu that confluxes after described multi-channel DC input branch circuit parallel connection, and preferred described bus-bar adopts confluence copper bar.Wherein the both positive and negative polarity of every road direct current input branch input is connected with the both positive and negative polarity of a photovoltaic array (solar cell tandem) output respectively, the both positive and negative polarity of every road direct current input branch road output is connected with the both positive and negative polarity of bus-bar respectively, and the output of this header box is connected with the input of the inverter of rear class.
Described multiple voltage compensation unit inputs branch road with multi-channel DC respectively and connects, and namely the quantity of described voltage compensation unit is identical with the quantity that direct current inputs branch road, and all corresponding road direct current input branch road of each voltage compensation unit.Wherein, each voltage compensation unit is all between the output and described bus-bar of the direct current input branch road of its correspondence.
The output that the described input comparing computing unit inputs branch road with each road direct current is respectively connected, and the described output comparing computing unit is connected with described multiple voltage compensation unit respectively.
The described computing unit that compares is for comparing each road direct current input branch road maximum power point place voltage, obtain maximum voltage value (i.e. the maximum of voltage) wherein, then calculate the difference that described maximum and each road direct current input the maximum power point place magnitude of voltage of branch road respectively, and described difference is exported respectively to voltage compensation unit place corresponding to each road direct current input branch road;
Described voltage compensation unit is used for carrying out voltage compensation according to the direct current input branch road of described difference to its correspondence, and the output voltage values of Shi Gai road direct current input branch road equals described maximum.
As shown in Figure 2, the described computing unit that compares comprises comparison module and computing module; Described each voltage compensation unit includes inversion module, voltage reduction module, rectification module, voltage regulating module and control module.
Wherein, the output that input and the described multi-channel DC of described comparison module input branch road is connected, compare and analysis for described multi-channel DC being inputted the maximum power point place voltage obtained after branch road carries out maximal power tracing respectively, show that the maximum of wherein voltage to be confluxed the d-c bus voltage value exported as this header box, and the maximum power point place magnitude of voltage described d-c bus voltage value and each road direct current being inputted branch road exports computing unit in real time;
The output of described computing module is connected with described multiple voltage compensation unit, input the difference of the maximum power point place magnitude of voltage of branch road for calculating described d-c bus voltage value and each road direct current, and described difference is exported respectively to voltage compensation unit place corresponding to each road direct current input branch road.
The input of the control module in described voltage compensation unit is connected with the output of the computing module compared in computing unit, controls voltage regulating module export the magnitude of voltage equal with described difference for the difference corresponding according to this voltage compensation unit.
The output of the direct current input branch road that the input of the inversion module in described voltage compensation unit is corresponding with it is connected, for being alternating current by the DC inverter of this branch road of input; The input of described voltage reduction module is connected with the output of inversion module, for carrying out step-down to described alternating current; The input of described rectification module is connected with the output of voltage reduction module, for the AC rectification after described step-down is become unidirectional pulsating nature direct current; The input of described voltage regulating module is connected with the output of rectification module, for using described unidirectional pulsating nature direct current as power supply and according to control module export control signal carry out pressure regulation.
As shown in Figure 3, in the present embodiment, described inversion module adopts inverter circuit, described rectification module adopts rectification circuit, described voltage reduction module adopts isolating transformer, described voltage regulating module comprises the first switching tube VT1, second switch pipe VT2, inductance L and electric capacity C, the drain electrode of described first switching tube VT1 is connected with the electrode input end of this voltage regulating module, the source electrode of the first switching tube VT1 is connected with the drain electrode of second switch pipe VT2, the drain electrode of second switch pipe VT2 is connected with the negative input of this voltage regulating module, the input of described inductance L is connected with the series connection node of second switch pipe VT2 with the first switching tube VT1, the output of inductance L is connected with the negative pole of electric capacity C, the positive pole of electric capacity C is connected with the drain electrode of the first switching tube VT1, the output positive and negative charge of this voltage regulating module is connected with the both positive and negative polarity of electric capacity C respectively.The magnitude of voltage that described control module regulates described voltage regulating module to export by the duty cycle of switching controlling the first switching tube VT1 and second switch pipe VT2, makes this magnitude of voltage equal with described difference (direct current that namely described d-c bus voltage value is corresponding with it inputs the difference of the maximum power point place magnitude of voltage of branch road).
As described in Figure 4, in the present embodiment, described photovoltaic array conflux box also can comprise multiple first circuit protection unit and a second circuit protected location.
The output that described multiple first protected location is connected on each road direct current input branch road respectively inputs between voltage compensation unit corresponding to branch road with each road direct current; for carrying out overcurrent protection to this header box; when preventing each road direct current input branch road to be short-circuited, header box and grid-connected photovoltaic system are caused damage.Preferably described first circuit protection unit adopts fuse.
Described second circuit protected location is connected with the output positive and negative charge of described bus-bar, is namely connected with the output of described header box, for transshipping and short-circuit protection to this header box.Preferred described second circuit protected location adopts DC circuit breaker.
The operation principle of photovoltaic array conflux box of the present invention is:
Described header box all has on the basis of maximal power tracing function at its each direct current input branch road, the maximum power point place magnitude of voltage that Xian Jiangge road direct current input branch road obtains after maximal power tracing compares and analysis, obtain the maximum of voltage wherein, and the d-c bus voltage value of output that the maximum of this voltage is confluxed as this header box, then according to the difference calculating described d-c bus voltage value and each road direct current and input the maximum power point place magnitude of voltage of branch road, the voltage compensation unit input voltage to each branch road corresponding by each direct current input branch road compensates, the output voltage of each road direct current input branch road is made to be equal to described DC bus-bar voltage, and the input voltage of each road direct current input branch road (output voltage of photovoltaic array/solar cell tandem that Ji Yugai road direct current input branch road is connected) is still maximum power point place voltage, Ji Ge road direct current input branch road still exports with its maximum power after confluxing through described header box, and the maximum power point place voltage of the branch road of each road direct current input originally changes by the DC bus-bar voltage exported that can not cause because the maximum power point place voltage of each road direct current input branch road is different confluxing, thus the gross output of this header box can be made to reach maximum.
As shown in Figure 5, the control flow of described photovoltaic array conflux box comprises the steps:
S101. the maximum power point place voltage Vmax of comparison and analysis each road direct current input branch road, show that wherein maximum to be confluxed the d-c bus voltage value V exported as this header box.
S102. the difference DELTA V that described d-c bus voltage value V and each road direct current input the maximum power point place magnitude of voltage Vmax of branch road is calculated.
S103. according to described difference DELTA V, the conducting duty ratio D1 of the first switching tube VT1 in the voltage regulating module of each voltage compensation unit and the conducting duty ratio D2 of second switch pipe VT2 is calculated.
S104. according to the conducting duty ratio D1 of the first switching tube VT1 in the voltage regulating module of each voltage compensation unit and the conducting duty ratio D2 of second switch pipe VT2, respectively the conduction and cut-off time of the first switching tube VT1 in each voltage regulating module and second switch pipe VT2 is controlled, each voltage regulating module output voltage is made to be equal to the difference DELTA V of its correspondence, even if the voltage that also each voltage compensation unit exports is equal to the difference DELTA V of its correspondence.
Repeated execution of steps s101 ~ s104, until the output voltage of each road direct current input branch road is equal to described DC bus-bar voltage, thus ensures that each road direct current input branch road exports with maximum power all the time.
Embodiment 2:
The difference of the present embodiment and embodiment 1 is:
In the present embodiment, described voltage compensation unit does not comprise inversion module, voltage reduction module and rectification module, and namely described voltage compensation unit only includes control module and voltage regulating module.
Other structures in the present embodiment and effect all identical with embodiment 1, repeat no more here.
Be understandable that, the illustrative embodiments that above execution mode is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (10)
1. a photovoltaic array conflux box, comprise multi-channel DC input branch road, conflux into a road direct current after described multi-channel DC input branch circuit parallel connection to export, every road direct current input branch road all possesses maximal power tracing function, make every road direct current input branch road all be operated in respective maximum power point place, it is characterized in that, described header box also comprises the multiple voltage compensation units inputting branch road respectively with described multi-channel DC and connect, and compare computing unit
The described computing unit that compares is for comparing each road direct current input branch road maximum power point place voltage, obtain maximum voltage value wherein, namely the maximum drawing direct current input branch road maximum power point place, each road voltage is compared, then calculate the difference that the maximum of described voltage and each road direct current input the maximum power point place magnitude of voltage of branch road respectively, and described difference is exported respectively to voltage compensation unit place corresponding to each road direct current input branch road;
The quantity of described voltage compensation unit is equal with the quantity that described direct current inputs branch road, and for carrying out voltage compensation according to the direct current input branch road of described difference to its correspondence, the output voltage values of Shi Gai road direct current input branch road equals the maximum of described voltage.
2. photovoltaic array conflux box according to claim 1, is characterized in that, the described computing unit that compares comprises comparison module and computing module,
The output that input and the described multi-channel DC of described comparison module input branch road is connected, compare and analysis for inputting the maximum power point place voltage obtained after branch road carries out maximal power tracing respectively to described multi-channel DC, show that wherein maximum to be confluxed the d-c bus voltage value exported as this header box, and the maximum power point place magnitude of voltage described d-c bus voltage value and each road direct current being inputted branch road exports computing module in real time;
The output of described computing module is connected with described multiple voltage compensation unit, input the difference of the maximum power point place magnitude of voltage of branch road for calculating described d-c bus voltage value and each road direct current, and described difference is exported respectively to voltage compensation unit place corresponding to each road direct current input branch road.
3. photovoltaic array conflux box according to claim 2, is characterized in that, described each voltage compensation unit includes voltage regulating module and control module,
Described control module is connected with the computing module compared in computing unit, exports a road direct current corresponding with described difference and described voltage compensation unit input the equal magnitude of voltage of the maximum power point place magnitude of voltage sum of branch road for controlling voltage regulating module according to difference corresponding to this voltage compensation unit.
4. photovoltaic array conflux box according to claim 3, is characterized in that, described voltage regulating module comprises the first switching tube, second switch pipe, inductance and electric capacity,
The described drain electrode of the first switching tube is connected with the electrode input end of this voltage regulating module, the source electrode of the first switching tube is connected with the drain electrode of second switch pipe, the source electrode of second switch pipe is connected with the negative input of this voltage regulating module, the input of described inductance is connected with the series connection node of second switch pipe with the first switching tube, the output of inductance is connected with the negative pole of electric capacity, the positive pole of electric capacity is connected with the drain electrode of the first switching tube, and the output positive and negative charge of this voltage regulating module is connected with the both positive and negative polarity of electric capacity respectively;
The magnitude of voltage that described control module regulates described voltage regulating module to export by the duty cycle of switching controlling the first switching tube and second switch pipe, the maximum power point place magnitude of voltage sum that the road direct current making this magnitude of voltage corresponding with described difference and described voltage compensation unit inputs branch road is equal.
5. photovoltaic array conflux box according to claim 3, is characterized in that, described voltage compensation unit also comprises inversion module, voltage reduction module and rectification module,
The output that the direct current that the input of described inversion module is corresponding with this voltage compensation unit inputs branch road is connected, for being alternating current by the DC inverter of this branch road of input;
The input of described voltage reduction module is connected with the output of inversion module, for carrying out step-down to described alternating current;
The input of described rectification module is connected with the output of voltage reduction module, for the AC rectification after described step-down is become unidirectional pulsating nature direct current;
The input of described voltage regulating module is connected with the output of rectification module, for using described unidirectional pulsating nature direct current as power supply and according to control module export control signal carry out pressure regulation.
6. photovoltaic array conflux box according to claim 5, is characterized in that, described inversion module adopts inverter circuit; Described rectification module adopts rectification circuit; Described voltage reduction module adopts isolating transformer.
7. according to the photovoltaic array conflux box one of claim 1-6 Suo Shu; it is characterized in that; described header box also comprises multiple first circuit protection unit; its output being connected on each road direct current input branch road respectively inputs between voltage compensation unit corresponding to branch road with each road direct current, for carrying out overcurrent protection to this header box.
8. photovoltaic array conflux box according to claim 7, is characterized in that, described first circuit protection unit adopts fuse.
9. according to the photovoltaic array conflux box one of claim 1-6 Suo Shu, it is characterized in that, described header box also comprises second circuit protected location, and it is connected with the output of described header box, for transshipping and short-circuit protection to this header box.
10. photovoltaic array conflux box according to claim 9, is characterized in that, described second circuit protected location adopts DC circuit breaker.
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| CN117318162B (en) * | 2023-11-29 | 2024-03-19 | 深圳鹏城新能科技有限公司 | MPPT optimization method, system and medium based on household energy storage inverter |
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| US20050139258A1 (en) * | 2003-12-29 | 2005-06-30 | Yung-Hsiang Liu | Solar cell array control device |
| FR2910141B1 (en) * | 2006-12-18 | 2009-02-20 | Agence Spatiale Europeenne | ELECTRIC POWER GENERATING SYSTEM WITH POWER MAXIMIZATION |
| CN201194333Y (en) * | 2008-03-17 | 2009-02-11 | 北京能高自动化技术有限公司 | Solar photovoltaic parallel-in system |
| DE102008042199A1 (en) * | 2008-09-18 | 2010-04-01 | Robert Bosch Gmbh | Photovoltaic device |
| CN102013841B (en) * | 2009-09-04 | 2012-10-03 | 华为技术有限公司 | Power supply system, method and device of solar battery |
| CN201789441U (en) * | 2010-07-09 | 2011-04-06 | 中海阳(北京)新能源电力股份有限公司 | Preinstalled type photovoltaic substation box |
| CN202004692U (en) * | 2010-12-30 | 2011-10-05 | 保定天威集团有限公司 | Photovoltaic power optimizer |
| CN202042502U (en) * | 2011-05-19 | 2011-11-16 | 北京景新电气技术开发有限责任公司 | Header box and photovoltaic power generation system applying same |
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