CN102820808B - Photovoltaic array combiner box - Google Patents

Photovoltaic array combiner box Download PDF

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Publication number
CN102820808B
CN102820808B CN201110162461.5A CN201110162461A CN102820808B CN 102820808 B CN102820808 B CN 102820808B CN 201110162461 A CN201110162461 A CN 201110162461A CN 102820808 B CN102820808 B CN 102820808B
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output
branch road
direct current
voltage
photovoltaic array
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CN102820808A (en
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刘伟增
张新涛
郭磊
熊俊峰
杨凯
羊睦汉
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TBEA Xinjiang Sunoasis Co Ltd
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TBEA Xinjiang Sunoasis Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Abstract

The invention provides a photovoltaic array combiner box which comprises a plurality of direct current input branch circuits and a control unit. A positive input end and a negative input end of each of the direct current input branch circuits are connected with a positive output end and a negative output end of a photovoltaic array of the direct current input branch circuit respectively, a positive output end and a negative output end of each of the direct current input branch circuits are combined into one-way positive pole output and one-way negative pole output through a positive combiner bus bar and a negative combiner bus bar respectively, the one-way positive pole output and one-way negative pole output are connected to a positive input end and a negative input end of an inverter, and each of the direct current input branch circuits comprises a maximum power tracking unit which is used for tracking maximum output power of the photovoltaic array of the direct current input branch circuit; and the control unit is used for determining the maximum output power of the photovoltaic array of each of the direct current input branch circuits and controlling each of the direct current input branch circuits to track the determined corresponding maximum output power. The photovoltaic array combiner box tracks the maximum output power of each of the direct current input branch circuits so that the photovoltaic array of each of the direct current input branch circuits can supply power for the post inverter with the maximum power, and the usage ratio of solar energy in a photovoltaic power generation system can be increased.

Description

Photovoltaic array conflux box
Technical field
The present invention relates to technical field of photovoltaic power generation, particularly relate to a kind of photovoltaic array conflux box with maximal power tracing.
Background technology
Along with starting of parallel network power generation, for fairly large photovoltaic generating system, in order to reduce the connecting line between photovoltaic module and inverter, maintain easily, photovoltaic array direct current collector-shoe gear need be increased (namely between photovoltaic module and inverter, header box), this device is exactly the array of some is confluxed into a road direct current to export.
The basic function that the header box major part that the company being engaged in solar product research and development at present produces only is confluxed, good product also only has the function of lightning protection, against short-circuit, over-current over-voltage protection.In addition, in order to improve the utilization factor of photovoltaic generating system to sun power, the combining inverter of most of producer all has maximal power tracing (MPPT) function, mainly carries out maximal power tracing to the power input of combining inverter.But, for current photovoltaic generating system, the input voltage of combining inverter is provided by the output of confluxing of photovoltaic combiner box, so the maximal power tracing (MPPT) in combining inverter is the tracking of the voltage and current after confluxing to multi-path light photovoltaic array, it is a kind of tracking always, the maximum power point traced into is a mean value, this tracking has certain effect really to the utilization factor improving sun power, but the photovoltaic array of each branch road for input, in each branch road, the peak power output point of photovoltaic array is different, if the peak power output of each branch road photovoltaic array is all by the average maximum power work traced into, some branch road then can be made not to be operated in the maximum power point place of this branch road, so the utilization factor of sun power in photovoltaic generating system does not reach maximum.
Summary of the invention
Technical matters to be solved by this invention is for the not high enough problem of the solar energy utilization ratio existed in existing photovoltaic array conflux box, there is provided a kind of photovoltaic array conflux box that can carry out separately peak power output tracking to the photovoltaic array of each branch road, to improve the utilization factor of sun power in photovoltaic generating system.
In order to realize above object, photovoltaic array conflux box provided by the invention comprises: multi-channel DC input branch road, the positive-negative input end of each direct current input branch road is connected to the positive-negative output end of the photovoltaic array of this branch road respectively, the positive-negative output end of each direct current input branch road confluxes into a road positive pole respectively by the positive and negative busbar that confluxes and exports and negative pole output, be connected to the positive-negative input end of inverter, and each direct current input branch road comprises the maximal power tracing unit of the peak power output of the photovoltaic array for following the tracks of this branch road; Control module, it is for determining the peak power output of the photovoltaic array of each direct current input branch road, and controls the determined corresponding peak power output of each direct current input branch road tracking.
Preferably, described each maximal power tracing unit comprises booster circuit, described control module is used for controlling, until the output voltage of this booster circuit reaches the voltage corresponding to peak power output of the photovoltaic array of this direct current input branch road according to the booster circuit of output voltage to this direct current input branch road of the photovoltaic array of each direct current input branch road.
Preferably, described booster circuit is BOOST booster circuit.
Preferably, described control module is for detecting output voltage and the output current of the photovoltaic array of each direct current input branch road, if the output voltage detected is greater than the nominal input voltage of described inverter, the switching tube then controlled in the BOOST booster circuit in this direct current input branch road is in cut-off state, otherwise carry out pulse-length modulation according to the switching tube that the output voltage detected and output current control in this BOOST booster circuit with high-frequency mode, until the output voltage of this BOOST booster circuit reaches the voltage corresponding to peak power output of the photovoltaic array of this direct current input branch road.
Preferably, described control module comprises: electric current and voltage sampling unit, and it is for detecting output voltage and the output current of the photovoltaic array of each direct current input branch road; Multiplier, its output voltage for the photovoltaic array by each direct current input branch road detected is multiplied with output current, to obtain the current output power value of the photovoltaic array of this direct current input branch road, and send the current reference magnitude of voltage corresponding to this current output power value and this current output power value to comparer, described reference voltage level is the voltage reference value of the photovoltaic array of this direct current input branch road, and initial value is the open-circuit voltage values of the battery tandem in the photovoltaic array of this direct current input branch road; Comparer, its current output power value for the photovoltaic array by each direct current input branch road and current reference magnitude of voltage compare with the last output power value followed the tracks of and reference voltage level, obtain the difference of output power and the difference of reference voltage that this direct current inputs the photovoltaic array of branch road; Regulator, its difference of output power for the photovoltaic array according to each direct current input branch road and the difference of reference voltage regulate current reference magnitude of voltage, to determine that this direct current inputs the reference voltage level corresponding to the peak power output of the photovoltaic array of branch road; Constant voltage tracker, it remains the determined reference voltage level of regulator for making the magnitude of voltage corresponding to the peak power output that traces into; Switch controlled unit, it is for judging whether the output voltage of the photovoltaic array detecting each direct current input branch road is greater than the nominal input voltage of described inverter, if, the switching tube then controlled in the BOOST booster circuit in this direct current input branch road is in cut-off state, otherwise the switching tube controlled in the BOOST booster circuit in this direct current input branch road carries out pulse-length modulation with high-frequency mode, until the output voltage of this BOOST booster circuit reaches the reference voltage level that constant voltage tracker keeps.
Preferably; the fuse for short-circuit protection is in series with respectively between the positive-negative input end of described each direct current input branch road and the positive-negative input end of described maximal power tracing unit; and/or the positive-negative output end of described each direct current input branch road and the described positive and negative DC circuit breaker be in series with respectively between busbar for overcurrent, overvoltage protection that confluxes, and/or in described each direct current input branch road, the front end of maximal power tracing unit is connected to for anti-lightning strike photovoltaic lightning arrester.
Preferably, described header box also comprises communication unit, and it is for sending the output voltage of photovoltaic array of described each direct current input branch road and the output voltage of output current and described header box and output current to Surveillance center or host computer.
The invention has the beneficial effects as follows: by adding maximal power tracing module for each branch road photovoltaic array, in order to follow the tracks of the peak power output of the photovoltaic array of each branch road, make the photovoltaic array of each branch road with peak power to the inverter power supply of rear class, thus the utilization factor of sun power in photovoltaic generating system can be improved all the time.
Accompanying drawing explanation
Fig. 1 is the theory diagram of photovoltaic array conflux box of the present invention;
Fig. 2 is the exemplary circuit diagram of the maximal power tracing unit in photovoltaic array conflux box of the present invention;
Fig. 3 is the theory diagram of the control module in photovoltaic array conflux box of the present invention;
Fig. 4 is the curve map of the relation illustrated between each branch voltage and output power;
Fig. 5 is the control flow chart of the control module in photovoltaic array conflux box of the present invention.
Embodiment
Below, present invention is described with embodiment with reference to the accompanying drawings.
The technical conceive of header box of the present invention is as the photovoltaic array of each branch road provides peak power output following function.In order to realize this design, header box of the present invention comprises multi-channel DC input branch road and the control module of the both positive and negative polarity parallel connection access of multi-path light photovoltaic array, wherein, the positive-negative input end of each direct current input branch road is connected to the positive-negative output end of the photovoltaic array of this branch road respectively, the positive-negative output end of each direct current input branch road confluxes into a road positive pole respectively by the positive and negative busbar that confluxes and exports and negative pole output, be connected to the positive-negative input end of inverter, and each direct current input branch road comprises the maximal power tracing unit of the peak power output of the photovoltaic array for following the tracks of this branch road, control module for determining the peak power output of the photovoltaic array of each direct current input branch road, and controls the determined corresponding peak power output of each direct current input branch road tracking.
Fig. 1 is the theory diagram of photovoltaic array conflux box of the present invention.In FIG; on each direct-flow input circuit except MPPT unit is shown; also show the unit for carrying out circuit protection to each direct-flow input circuit, comprise the fuse for short-circuit protection, the DC circuit breaker for overcurrent, overvoltage protection and for anti-lightning strike photovoltaic lightning arrester.These circuit protection units can according to actual conditions choice for use.
Specifically, the positive and negative electrode parallel connection access photovoltaic array conflux box of multi-path light photovoltaic array (i.e. the tandem of solar cell shown in Fig. 1), the positive input terminal of each parallel branch and negative input end are first connected in series PV special fuse respectively, when preventing each branch road to be short-circuited, cause damage to system.Then the positive input terminal of each parallel branch and negative input end connect with the positive input terminal of maximal power tracing (MPPT) unit and negative input end respectively.After maximal power tracing (MPPT) unit, in each direct current input branch road, the output cathode of maximal power tracing (MPPT) unit confluxes into a road positive pole output by the busbar that confluxes, and in each direct current input branch road, the output negative pole of maximal power tracing (MPPT) unit confluxes into a road negative pole output by another busbar that confluxes.The positive and negative output terminal of last header box is connected with the positive and negative output terminal of header box by DC circuit breaker.The front end of maximal power tracing (MPPT) unit of each direct current input branch road is all connected to special photovoltaic array lightning arrester in addition, the positive terminals of each photovoltaic lightning arrester are connected with the positive pole of photovoltaic array branch road, the negative terminals of each photovoltaic lightning arrester are connected with the negative pole of photovoltaic array branch road, the earth terminal of each photovoltaic lightning arrester is all received on the ground connection busbar of header box inside, draws a ground terminal and be externally connected in the outside of header box.
In addition, header box of the present invention also can have remote communications capability, can in header box of the present invention integrated communication unit, it is for (such as, adopt the communication modes of RS485) send the output voltage of photovoltaic array of described each direct current input branch road and the data such as the output voltage of electric current and described header box and output current to Surveillance center or host computer, realize remote monitoring.
In order to realize maximal power tracing, each maximal power tracing (MPPT) unit can comprise a booster circuit.In this case, control module can be used for controlling, until the output voltage of this booster circuit reaches the voltage corresponding to peak power output of the photovoltaic array of this direct current input branch road according to the booster circuit of output voltage to this direct current input branch road of the photovoltaic array of each direct current input branch road.
Here, booster circuit can be BOOST booster circuit (that is, switch DC booster circuit).In this case, control module can be used for output voltage and the output current of the photovoltaic array detecting each direct current input branch road, if the output voltage detected is greater than the nominal input voltage of described inverter, the switching tube then controlled in the BOOST booster circuit in this direct current input branch road is in cut-off state, otherwise carry out pulse-length modulation according to the switching tube in the output voltage detected and this BOOST booster circuit of Current Control with high-frequency mode, until the output voltage of this BOOST booster circuit reaches the voltage corresponding to peak power output of the photovoltaic array of this direct current input branch road.
Fig. 2 is the exemplary circuit diagram of maximal power tracing (MPPT) unit in photovoltaic array conflux box of the present invention.
In fig. 2, maximal power tracing (MPPT) unit is BOOST booster circuit.Specifically, input capacitance C1 is parallel with between the positive and negative input end of MPPT unit, for the input filter of MPPT unit, then the positive input terminal of MPPT unit is connected in series an inductance L, the output terminal of inductance L is connected with the anode of diode D, the negative electrode of diode D is connected with MPPT unit positive output end, switching tube K1 is connected between the tie point of inductance L and diode D and the negative input end of MPPT unit, electric capacity C2 is connected to, for the output filtering of MPPT unit between the positive and negative output terminal of last MPPT unit.
The specific works mode of the unit of MPPT shown in Fig. 2 is as follows:
As the output voltage U of the solar cell tandem of header box each direct current input branch road pVbe more than or equal to header box rear class meet the nominal input voltage U of inverter intime, i.e. U pV>=U in, the switching tube K1 in MPPT unit is in cut-off state, the output voltage U of battery tandem pVdirectly by inductance L and diode D, output to the output terminal of MPPT unit, now MPPT unit is without maximal power tracing function, now the output power P=U of each branch road photovoltaic array in* I pv, wherein, I pvfor the output current of each branch road photovoltaic array, this is because now the output terminal of header box is connected on the input end of inverter, when the output voltage of header box is greater than the input voltage of inverter, the output voltage of header box is pulled to the input voltage U of inverter by the input direct-current busbar voltage of inverter setting in;
As the output voltage U of the solar cell tandem of header box each direct current input branch road pVbe less than header box rear class meet the nominal input voltage U of inverter intime, i.e. U pV< U inswitching tube K1 in MPPT unit carries out pulse-length modulation (PWM) with high-frequency mode, boosting rectifier control is carried out to the output voltage of corresponding light photovoltaic array, until the output voltage of MPPT unit reaches the voltage corresponding to peak power output of corresponding light photovoltaic array, now the output power of corresponding light photovoltaic array reaches maximum.
Fig. 3 is the theory diagram of the control module in photovoltaic array conflux box of the present invention.
As shown in Figure 3, the control module in photovoltaic array conflux box of the present invention can comprise electric current and voltage sampling unit, multiplier, comparer, regulator, constant voltage tracker (CVT) and switch controlled unit.
Wherein, electric current and voltage sampling unit is for detecting the output voltage U of the photovoltaic array of each direct current input branch road nwith output current I n.
Multiplier is used for the output voltage U of the photovoltaic array of each direct current input branch road detected nwith output current I nbe multiplied, to obtain the current output power value P of the photovoltaic array of this direct current input branch road n=U n× I n, and by this current output power value P nwith the current reference magnitude of voltage U corresponding to this current output power value refn () sends comparer to, described reference voltage level U reffor the voltage reference value of the photovoltaic array of this direct current input branch road, be initially the open-circuit voltage values of the battery tandem in the photovoltaic array of this direct current input branch road.
Comparer is used for the current output power value P of the photovoltaic array of each direct current input branch road nwith current reference magnitude of voltage U ref(n) and last output power value (also can be described as and the remember power) P followed the tracks of n-1with reference voltage level U ref(n-1) compare, obtain the difference Δ P=P of the output power of the photovoltaic array of this direct current input branch road n-P n-1with the difference Δ U=U of reference voltage ref(n)-U ref(n-1).
The difference Δ U of difference Δ P and reference voltage that regulator is used for the output power of the photovoltaic array according to each direct current input branch road is to current reference magnitude of voltage U refn () regulates, to determine that this direct current inputs the reference voltage level U corresponding to the peak power output of the photovoltaic array of branch road ref.
Constant voltage tracker remains the determined reference voltage level U of regulator for making the magnitude of voltage corresponding to the peak power output that traces into ref.
Switch controlled unit is for judging the output voltage U of the photovoltaic array of each direct current input branch road detected pVwhether be greater than the nominal input voltage U of described inverter inif, the switching tube K1 then controlled in the BOOST booster circuit in this direct current input branch road is in cut-off state, otherwise the switching tube K1 controlled in the BOOST booster circuit in this direct current input branch road carries out pulse-length modulation with high-frequency mode, until the output voltage of this BOOST booster circuit reaches the reference voltage level U that CVT keeps ref.
Here, as mentioned above, the voltage reference value U of the photovoltaic array of each branch road refbe the open-circuit voltage of each branched battery tandem at first, regulated in real time by the control module of MPPT unit afterwards, finally reach the magnitude of voltage corresponding to peak power output point.Under Fig. 4 shows fixed temperature, different illumination conditions, the graph of relation between the voltage of each branch road photovoltaic array and output power.
Should be appreciated that, the structure of control module of the present invention divides or the function division of its control operation is not limited to partition structure shown in Fig. 3, but can adjust accordingly according to actual conditions.
Fig. 5 is the control flow chart of the control module in photovoltaic array conflux box of the present invention.
As shown in Figure 5, first, before carrying out MPPT tracking, in step S501, the output voltage U of each branch road photovoltaic array of switch controlled unit judges pVwhether be less than the nominal input voltage U of inverter in.If U pV>=U in(i.e. "No"), then header box does not just carry out MPPT tracking, now, enters into step S502, and in step S502, switch controlled unit controls switching tube K1 is in cut-off state, and enters into step S515.If U pV< U in(i.e. "Yes"), then header box will enter MPPT tracking, now, enter into step S503.
In step S503, electric current and voltage sampling unit detects the output voltage U of photovoltaic array in each branch road nwith output current I n, the output voltage U then will detected nwith output current I nsend into multiplier.
Then, in step S504, multiplier obtains current performance number P through carrying out multiplying n=U n× I n, and by P nand corresponding U refn () value (as shown in Figure 4) sends into comparer and the last performance number P followed the tracks of n-1(memory power) and magnitude of voltage U ref(n-1) compare, obtain Δ P=P n-P n-1with Δ U=U ref(n)-U ref(n-1), Δ P and Δ U is sent into regulator by comparer.
Then, in step S505-S513, carry out plus-minus by the magnitude of voltage of regulator to each branch road photovoltaic array and regulate, with the reference voltage level U corresponding to the peak power output determining each branch road photovoltaic array ref.Specifically, first, in step S505, judge whether Δ P equals 0.If judge Δ P=0 in step S505, then without the need to adjusting reference voltage level, now entering into step S509, in step S509, still keeping current U ref(n) value, and enter into step S514.If judge that in step S505 Δ P is not equal to 0, then enter into step S506, in step S506, judge whether Δ P is greater than 0.If judge Δ P > 0 in step S506, then need to adjust accordingly according to the magnitude of voltage of value to each branch road photovoltaic array of Δ U.Now, in step S508, first judge whether Δ U is greater than 0.As Δ U > 0, in step S513, increase reference voltage level, make U ref=U ref+ Δ U, as Δ U < 0, reduces reference voltage level, makes U in step S512 ref=U ref-Δ U.If judge Δ P≤0 in step S506, then need to adjust accordingly according to the magnitude of voltage of value to each branch road of Δ U.Now, judge whether Δ U is greater than 0 first in step s 507.As Δ U > 0, in step S510, reduce reference voltage level, make U ref=U ref-Δ U, as Δ U < 0, increases reference voltage level, makes U in step S511 ref=U ref+ Δ U.
Then, in step S514, regulator judges whether to find peak power output point, that is, judge whether Δ U is less than or equal to 2V, and Δ U is herein the U obtained in any one in step S509-S513 refwith the U obtained in step S504 refthe difference of (n).If so, then enter into step S516, otherwise enter into step S515, in step S515, stand-by period Δ T time (such as, waiting for for 3 seconds), enters in circulation next time, namely jumps to step S501.Need to wait for that the reason of Δ T time is because control module performs computing need the regular hour, in order to ensure to calculate accurate operation, then carry out next circulation time and preferably stop a few second.That is, as Δ U≤2V, then the circulation of MPPT maximal power tracing terminates, and as Δ U > 2V, illustrates and is much to seek maximum power point, also needs to continue circulation, until the magnitude of voltage of Δ U satisfies condition.
In step S516, CVT makes the magnitude of voltage corresponding to peak power output traced into remain the determined reference voltage level U of regulator ref.
In step S517, the conducting dutycycle D of switch controlled unit compute switch pipe K1 (the ON time T of switching tube K1 in one-period oNwith the ratio of switch periods time T), concrete account form is as follows:
By the voltage U corresponding to determined peak power output point refbe worth the output voltage values as BOOST booster circuit, detect the output voltage U of the battery tandem of each branch road photovoltaic array in real time pVthen by U pVwith the U determined refvalue substitutes into the conducting dutycycle D that following formula calculates switching tube K1:
D=1-U PV/U ref(1)
Then, in step S518, switch controlled unit, according to the dutycycle D of the switching tube K1 calculated, sends the ON time that corresponding control signal carrys out gauge tap pipe K1, now, and the ON time T of switching tube K1 oN=T × D.In this way, namely controllable switch pipe K1 carries out PWM with high-frequency mode, until the size of the reference voltage level Uref of the magnitude of voltage of each branch road photovoltaic array corresponding to peak power output.
By above flow process, namely by the peak power output finding each branch road photovoltaic array that repeatedly circulates, finally realize the maximal power tracing of each branch road photovoltaic array, so just make each branch road of the input of header box all the time can with peak power to the inverter power supply of rear class.Carrying out in maximal power tracing process, the cell panel of each branch road photovoltaic array (particularly, battery tandem) peak power output be uncertain, it is by maximal power tracing process, the last reference voltage level just can determined corresponding to cell panel Maximum Power Output point, then the output voltage of cell panel boosted to the magnitude of voltage corresponding to the determined maximum power point of MPPT by booster circuit, namely think that now the output power of cell panel reaches maximum.
Above with BOOST booster circuit exemplarily to invention has been exemplary illustration.But, should be appreciated that, the present invention also can adopt the booster circuit of other type or structure, then controls adopted booster circuit according to above control principle, until the reference voltage level of the output voltage of this booster circuit corresponding to the peak power output of each branch road photovoltaic array.In addition, the control method of the peak power output of each branch road photovoltaic array is not limited to the plus-minus control method shown in Fig. 5, and other alternative manner or searching method also can be adopted to obtain the peak power output of each branch road photovoltaic array.
Below with reference to drawings and Examples to invention has been detailed description, but should be appreciated that, the present invention is not limited to above disclosed exemplary embodiment.Claim should be given to explain the most widely, to contain all modification of disclosed exemplary embodiment, equivalent structure and function.

Claims (4)

1. a photovoltaic array conflux box, comprising:
Multi-channel DC input branch road, the positive-negative input end of each direct current input branch road is connected to the positive-negative output end of the photovoltaic array of this branch road respectively, the positive-negative output end of each direct current input branch road confluxes into a road positive pole respectively by the positive and negative busbar that confluxes and exports and negative pole output, be connected to the positive-negative input end of inverter, and each direct current input branch road comprises the maximal power tracing unit of the peak power output of the photovoltaic array for following the tracks of this branch road;
Control module, it is for determining the peak power output of the photovoltaic array of each direct current input branch road, and controls the determined corresponding peak power output of each direct current input branch road tracking;
Described each maximal power tracing unit comprises booster circuit, described control module is used for controlling, until the output voltage of this booster circuit reaches the voltage corresponding to peak power output of the photovoltaic array of this direct current input branch road according to the booster circuit of output voltage to this direct current input branch road of the photovoltaic array of each direct current input branch road;
Particularly, described booster circuit is BOOST booster circuit, described BOOST booster circuit just, input capacitance C1 is parallel with between negative input end, for the input filter of BOOST booster circuit, the positive input terminal of BOOST booster circuit is connected in series an inductance L, the output terminal of inductance L is connected with the anode of diode D, the negative electrode of diode D is connected with BOOST booster circuit positive output end, switching tube K1 is connected between the tie point of inductance L and diode D and the negative input end of BOOST booster circuit, BOOST booster circuit just, electric capacity C2 is connected between negative output terminal, for the output filtering of BOOST booster circuit,
The working method of BOOST booster circuit is as follows:
As the output voltage U of the solar cell tandem of header box each direct current input branch road pVbe more than or equal to header box rear class meet the nominal input voltage U of inverter intime, i.e. U pV>=U in, the switching tube K1 in BOOST booster circuit is in cut-off state, the output voltage U of battery tandem pVdirectly by inductance L and diode D, output to the output terminal of BOOST booster circuit, now this BOOST booster circuit is without maximal power tracing function, the output power P=U of each branch road photovoltaic array in* I pv, wherein, I pvfor the output current of each branch road photovoltaic array;
As the output voltage U of the solar cell tandem of header box each direct current input branch road pVbe less than header box rear class meet the nominal input voltage U of inverter intime, i.e. U pV< U inswitching tube K1 in BOOST booster circuit carries out pulse-length modulation with high-frequency mode, boosting rectifier control is carried out to the output voltage of corresponding light photovoltaic array, until the output voltage of BOOST booster circuit reaches the voltage corresponding to peak power output of corresponding light photovoltaic array.
2. photovoltaic array conflux box according to claim 1, is characterized in that, described control module comprises:
Electric current and voltage sampling unit, it is for detecting output voltage and the output current of the photovoltaic array of each direct current input branch road;
Multiplier, its output voltage for the photovoltaic array by each direct current input branch road detected is multiplied with output current, to obtain the current output power value of the photovoltaic array of this direct current input branch road, and send the current reference magnitude of voltage corresponding to this current output power value and this current output power value to comparer, reference voltage level is the voltage reference value of the photovoltaic array of this direct current input branch road, and its initial value is the open-circuit voltage values of the battery tandem in the photovoltaic array of this direct current input branch road;
Comparer, its current output power value for the photovoltaic array by each direct current input branch road and current reference magnitude of voltage compare with the last output power value followed the tracks of and reference voltage level, obtain the difference of output power and the difference of reference voltage that this direct current inputs the photovoltaic array of branch road;
Regulator, its difference of output power for the photovoltaic array according to each direct current input branch road and the difference of reference voltage regulate current reference magnitude of voltage, to determine that this direct current inputs the reference voltage level corresponding to the peak power output of the photovoltaic array of branch road;
Constant voltage tracker, it remains the determined reference voltage level of regulator for making the magnitude of voltage corresponding to the peak power output that traces into;
Switch controlled unit, whether its output voltage for the photovoltaic array judging each direct current input branch road detected is greater than the nominal input voltage of described inverter, if, the switching tube then controlled in the BOOST booster circuit in this direct current input branch road is in cut-off state, otherwise the switching tube controlled in the BOOST booster circuit in this direct current input branch road carries out pulse-length modulation with high-frequency mode, until the output voltage of this BOOST booster circuit reaches the reference voltage level that constant voltage tracker keeps.
3. photovoltaic array conflux box according to claim 2, is characterized in that, is in series with the fuse for short-circuit protection between the positive-negative input end of described each direct current input branch road and the positive-negative input end of described maximal power tracing unit respectively, and/or
The positive-negative output end of described each direct current input branch road and the described positive and negative DC circuit breaker be in series with respectively between busbar for overcurrent, overvoltage protection that confluxes, and/or
In described each direct current input branch road, the front end of maximal power tracing unit is connected to for anti-lightning strike photovoltaic lightning arrester.
4. photovoltaic array conflux box according to claim 1, it is characterized in that, also comprise communication unit, it is for sending the output voltage of photovoltaic array of described each direct current input branch road and the output voltage of output current and described header box and output current to Surveillance center or host computer.
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