CN102820808A - Photovoltaic array combiner box - Google Patents
Photovoltaic array combiner box Download PDFInfo
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- CN102820808A CN102820808A CN2011101624615A CN201110162461A CN102820808A CN 102820808 A CN102820808 A CN 102820808A CN 2011101624615 A CN2011101624615 A CN 2011101624615A CN 201110162461 A CN201110162461 A CN 201110162461A CN 102820808 A CN102820808 A CN 102820808A
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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
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- 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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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
Technical field
The present invention relates to the photovoltaic power generation technology field, relate in particular to a kind of photovoltaic array header 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 the inverter, maintain easily, needing increases photovoltaic array direct current collector-shoe gear (promptly between photovoltaic module and inverter; Header box), this device confluxes into the output of one road direct current with the array of some exactly.
Be engaged in the basic function that the header box major part that company produced of solar product research and development is only confluxed at present, better products also has only the function of lightning protection, anti-short circuit, over-current over-voltage protection.In addition, in order to improve photovoltaic generating system to solar energy utilization rate, the combining inverter of most of producers all has maximal power tracing (MPPT) function, mainly is that the input power of combining inverter is carried out maximal power tracing.But; For present photovoltaic generating system, the input voltage of combining inverter is to be exported by confluxing of photovoltaic header box to provide, so the maximal power tracing in the combining inverter (MPPT) is the tracking of the voltage and current after the multichannel photovoltaic array is confluxed; It is a kind of total tracking; The maximum power point that traces into is a mean value, and this tracking has certain effect really to improving solar energy utilization rate, but for the photovoltaic array of each branch road of input; The peak power output of photovoltaic array point is different in each branch road; If the peak power output of each branch road photovoltaic array all by the average maximum power work that traces into, then can make some branch road not be operated in the maximum power point place of this branch road, so that the solar energy utilization rate in the photovoltaic generating system does not reach is maximum.
Summary of the invention
Technical problem to be solved by this invention is the not high enough problem of solar energy utilization ratio that exists in the existing photovoltaic array header box; Provide a kind of and can carry out the photovoltaic array header box that peak power output is followed the tracks of separately, to improve solar energy utilization rate in the photovoltaic generating system the photovoltaic array of each branch road.
In order to realize above purpose; Photovoltaic array header 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 one road anodal output and negative pole output through the positive and negative busbar that confluxes respectively; 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 that is used to follow the tracks of this branch road; Control unit, it is used for the peak power output of the photovoltaic array of definite each direct current input branch road, and controls each direct current input branch road and follow the tracks of determined corresponding peak power output.
Preferably; Said each maximal power tracing unit comprises booster circuit; Said control unit is used for according to the output voltage of the photovoltaic array of each direct current input branch road the booster circuit of this direct current input branch road being controlled, and reaches the pairing voltage of peak power output of the photovoltaic array of this direct current input branch road up to the output voltage of this booster circuit.
Preferably, said booster circuit is the BOOST booster circuit.
Preferably; Said control unit is used to detect output voltage and the output current that each direct current is imported the photovoltaic array of branch road; If the output voltage that detects is greater than the specified input voltage of said inverter; The switching tube of then controlling in the BOOST booster circuit in this direct current input branch road is in cut-off state; Otherwise the switching tube according in the output voltage that detects and this BOOST booster circuit of output current control carries out pulse width modulation with high-frequency mode, reaches the pairing voltage of peak power output of the photovoltaic array of this direct current input branch road up to the output voltage of this BOOST booster circuit.
Preferably, said control unit comprises: the electric current and voltage sampling unit, and it is used to detect output voltage and the output current that each direct current is imported the photovoltaic array of branch road; Multiplier; It is used for the output voltage and the output current of the photovoltaic array of each the direct current input branch road that detects are multiplied each other; Import the present output power value of the photovoltaic array of branch road to obtain this direct current; And should send comparator to the pairing current reference voltage level of this current output power value by current output power value; Said 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; Comparator; It is used for the present output power value of the photovoltaic array of each direct current input branch road and current reference voltage level are compared with last output power value and the reference voltage level of following the tracks of, and obtains difference and reference voltage poor of power output that this direct current is imported the photovoltaic array of branch road; Adjuster; It is used for according to the difference of the power output of the photovoltaic array of each direct current input branch road and the difference of reference voltage current reference voltage level being regulated, and imports the pairing reference voltage level of peak power output of the photovoltaic array of branch road to confirm this direct current; The constant voltage tracker, it is used to make the pairing magnitude of voltage of the peak power output that traces into to remain the determined reference voltage level of adjuster; The switch controlled unit; Whether its output voltage that is used to judge the photovoltaic array that detects each direct current input branch road is greater than the specified input voltage of said inverter; If; The switching tube of then controlling in the BOOST booster circuit in this direct current input branch road is in cut-off state; Otherwise the switching tube of controlling in the BOOST booster circuit in this direct current input branch road carries out pulse width modulation with high-frequency mode, reaches the reference voltage level that the constant voltage tracker is kept up to the output voltage of this BOOST booster circuit.
Preferably; Be in series with the fuse that is used for short-circuit protection respectively between the positive-negative input end of said each direct current input branch road and the positive-negative input end of said maximal power tracing unit; And/or said each direct current input branch road positive-negative output end and said positive and negative confluxing are in series with the dc circuit breaker that is used for overcurrent, overvoltage protection between the busbar respectively, and/or the front end of maximal power tracing unit is connected to and is used for the anti-photovoltaic lightning arrester that is struck by lightning in said each direct current input branch road.
Preferably, said header box also comprises communication unit, and it is used for sending the output voltage of the photovoltaic array of said each direct current input branch road and the output voltage and the output current of output current and said header box to Surveillance center or host computer.
The invention has the beneficial effects as follows: through adding the maximal power tracing module for each branch road photovoltaic array; Peak power output in order to the photovoltaic array of following the tracks of each branch road; Make the photovoltaic array of each branch road can give the inverter power supply of back level with maximum power all the time, thereby improve solar energy utilization rate in the photovoltaic generating system.
Description of drawings
Fig. 1 is the theory diagram of photovoltaic array header box of the present invention;
Fig. 2 is the exemplary circuit diagram of the maximal power tracing unit in the photovoltaic array header box of the present invention;
Fig. 3 is the theory diagram of the control unit in the photovoltaic array header box of the present invention;
Fig. 4 is the curve chart that the relation between each branch voltage and the power output is shown;
Fig. 5 is the control flow chart of the control unit in the photovoltaic array header box of the present invention.
Embodiment
Below, will present invention is described with reference to accompanying drawing and embodiment.
The technical conceive of header box of the present invention is for the photovoltaic array of each branch road the peak power output following function to be provided.In order to realize this design; Header box of the present invention comprises multi-channel DC input branch road and the control unit that the both positive and negative polarity parallel connection of multichannel photovoltaic array inserts; 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 one road anodal output and negative pole output through the positive and negative busbar that confluxes respectively, is connected to the positive-negative input end of inverter, and each direct current is imported the maximal power tracing unit that branch road comprises the peak power output of the photovoltaic array that is used to follow the tracks of this branch road; Control unit is used for the peak power output of the photovoltaic array of definite each direct current input branch road, and controls each direct current input branch road and follow the tracks of determined corresponding peak power output.
Fig. 1 is the theory diagram of photovoltaic array header box of the present invention.In Fig. 1; On each direct-flow input circuit except the MPPT unit is shown; Also show the unit that is used for each direct-flow input circuit is carried out circuit protection, comprise the fuse that is used for short-circuit protection, the photovoltaic lightning arrester that is used for the dc circuit breaker of overcurrent, overvoltage protection and is used for preventing being struck by lightning.These circuit protection units can be selected to use according to actual conditions.
Specifically; The positive and negative electrode parallel connection of multichannel photovoltaic array (being the tandem of solar cell shown in Fig. 1) inserts the photovoltaic array header box; The positive input terminal of each parallel branch and negative input end are connected in series earlier the special-purpose fuse of PV respectively, when preventing that each branch road is short-circuited, system are caused damage.The positive input terminal of each parallel branch and negative input end join with the positive input terminal and the negative input end of maximal power tracing (MPPT) unit respectively then.Behind maximal power tracing (MPPT) unit; The output cathode of maximal power tracing (MPPT) unit confluxes into one road anodal output through the busbar that confluxes in each direct current input branch road, and the output negative pole of maximal power tracing (MPPT) unit confluxes into the output of one road negative pole through another busbar that confluxes in each direct current input branch road.The positive and negative output of last header box is connected with the positive and negative output of header box through dc circuit breaker.The front end of maximal power tracing (MPPT) unit of each direct current input branch road all is connected to special-purpose 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 inner ground connection busbar of header box, draws an earth terminal and externally is connected in the outside of header box.
In addition; Header box of the present invention also can have remote communications capability; Can be in header box of the present invention the integrated communication unit; It is used for (for example, adopting the communication modes of RS485) will said each direct current input branch road the data such as output voltage and output current of output voltage and electric current and said header box of photovoltaic array send Surveillance center or host computer to, the realization remote monitoring.
In order to realize maximal power tracing, each maximal power tracing (MPPT) unit can comprise a booster circuit.In this case; Control unit can be used for according to the output voltage of the photovoltaic array of each direct current input branch road the booster circuit of this direct current input branch road being controlled, and reaches the pairing voltage of peak power output of the photovoltaic array of this direct current input branch road up to the output voltage of this booster circuit.
Here, booster circuit can be BOOST booster circuit (that is a switch DC booster circuit).In this case; Control unit can be used for detecting output voltage and the output current that each direct current is imported the photovoltaic array of branch road; If the output voltage that detects is greater than the specified input voltage of said inverter; The switching tube of then controlling in the BOOST booster circuit in this direct current input branch road is in cut-off state; Otherwise carry out pulse width modulation according to output voltage that detects and the switching tube in this BOOST booster circuit of Current Control with high-frequency mode, reach the pairing voltage of peak power output of the photovoltaic array of this direct current input branch road up to the output voltage of this BOOST booster circuit.
Fig. 2 is the exemplary circuit diagram of maximal power tracing (MPPT) unit in the photovoltaic array header box of the present invention.
In Fig. 2, maximal power tracing (MPPT) unit is the BOOST booster circuit.Specifically; Be parallel with input capacitance C1 between the positive and negative input of MPPT unit; Be used for the input filtering of MPPT unit, the positive input terminal of MPPT unit is connected in series an inductance L then, and the output 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; Be connected to switching tube K1 between the negative input end of the tie point of inductance L and diode D and MPPT unit, be connected to capacitor C 2 between the positive and negative output of last MPPT unit, be used for the output filtering of MPPT unit.
The concrete working method of MPPT shown in Figure 2 unit is following:
Import the output voltage U of the solar cell tandem of branch road when each direct current of header box
PVSpecified input voltage U more than or equal to the level inverter that connects behind the header box
InThe time, i.e. U
PV>=U
In, the switching tube K1 in the MPPT unit is in cut-off state, the output voltage U of battery tandem
PVDirectly through inductance L and diode D, output to the output of MPPT unit, this moment, the MPPT unit did not have the maximal power tracing function, at this moment the power output P=U of each branch road photovoltaic array
In* I
Pv, wherein, I
PvOutput current for each branch road photovoltaic array; This be because this moment header box output be connected on the input of inverter; When the output voltage of header box during greater than the input voltage of inverter, the input DC bus-bar voltage that inverter is set is pulled to the output voltage of header box the input voltage U of inverter
In
Import the output voltage U of the solar cell tandem of branch road when each direct current of header box
PVSpecified input voltage U less than the level inverter that connects behind the header box
InThe time, i.e. U
PV＜U
InSwitching tube K1 in the MPPT unit carries out pulse width modulation (PWM) with high-frequency mode; To the control of boosting of the output voltage of corresponding light photovoltaic array; Output voltage up to the MPPT unit reaches the pairing voltage of peak power output of corresponding light photovoltaic array, and this moment, the power output of corresponding light photovoltaic array reached maximum.
Fig. 3 is the theory diagram of the control unit in the photovoltaic array header box of the present invention.
As shown in Figure 3, the control unit in the photovoltaic array header box of the present invention can comprise electric current and voltage sampling unit, multiplier, comparator, adjuster, constant voltage tracker (CVT) and switch controlled unit.
Wherein, the electric current and voltage sampling unit is used to detect the output voltage U that each direct current is imported the photovoltaic array of branch road
nWith output current I
n
Multiplier is used for the output voltage U with the photovoltaic array of each the direct current input branch road that detects
nWith output current I
nMultiply each other, import the present output power value P of the photovoltaic array of branch road to obtain this direct current
n=U
n* I
n, and should current output power value P
nWith the pairing current reference voltage level U of this current output power value
Ref(n) send comparator to, said reference voltage level U
RefBe 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.
Comparator is used for the present output power value P with the photovoltaic array of each direct current input branch road
nWith current reference voltage level U
Ref(n) with the last output power value of following the tracks of (also can be described as memory power) P
N-1With reference voltage level U
Ref(n-1) compare, obtain the difference Δ P=P of power output of the photovoltaic array of this direct current input branch road
n-P
N-1Difference Δ U=U with reference voltage
Ref(n)-U
Ref(n-1).
Adjuster is used for difference Δ U according to the difference Δ P of the power output of the photovoltaic array of each direct current input branch road and reference voltage to current reference voltage level U
Ref(n) regulate, import the pairing reference voltage level U of peak power output of the photovoltaic array of branch road to confirm this direct current
Ref
The constant voltage tracker is used to make the pairing magnitude of voltage of the peak power output that traces into to remain the determined reference voltage level U of adjuster
Ref
The switch controlled unit is used to judge the output voltage U of photovoltaic array of each direct current input branch road of detection
PVWhether greater than the specified input voltage U of said inverter
InIf; The switching tube K1 that then controls in the BOOST booster circuit in this direct current input branch road is in cut-off state; Otherwise the switching tube K1 that controls in the BOOST booster circuit in this direct current input branch road carries out pulse width modulation with high-frequency mode, reaches the reference voltage level U that CVT keeps up to the output voltage of this BOOST booster circuit
Ref
Here, as stated, 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, the control unit through the MPPT unit carried out real-time regulated afterwards, finally reached peak power output and put pairing magnitude of voltage.Fig. 4 shows under fixed temperature, the different illumination conditions, the voltage of each branch road photovoltaic array and the graph of relation between the power output.
Should be appreciated that the structure of control unit of the present invention is divided or the function division of its control operation is not limited to partition structure shown in Figure 3, but can adjust accordingly according to actual conditions.
Fig. 5 is the control flow chart of the control unit in the photovoltaic array header box of the present invention.
As shown in Figure 5, at first, before carrying out the MPPT tracking, in step S501, the output voltage U of each branch road photovoltaic array of switch controlled unit judges
PVWhether less than the specified input voltage U of inverter
InIf U
PV>=U
In(promptly " denying "), then header box is followed the tracks of with regard to not carrying out MPPT, at this moment, 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(promptly " being "), then header box will get into the MPPT tracking, at this moment, enter into step S503.
In step S503, the electric current and voltage sampling unit detects the output voltage U of photovoltaic array in each branch road
nWith output current I
n, then with the output voltage U that detects
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 with P
nAnd corresponding U
Ref(n) value (as shown in Figure 4) is sent into comparator and the last performance number P that follows 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), comparator is sent Δ P and Δ U into adjuster.
Then, in step S505-S513, the magnitude of voltage of each branch road photovoltaic array is added and subtracted adjusting, to confirm the pairing reference voltage level U of peak power output of each branch road photovoltaic array by adjuster
RefSpecifically, at first, in step S505, judge whether Δ P equals 0.If in step S505, judge Δ P=0, then need not to adjust reference voltage level, enter into step S509 this moment, in step S509, still keeps 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 that whether Δ P is greater than 0.If in step S506, judge Δ P＞0, then need the magnitude of voltage of each branch road photovoltaic array to be adjusted accordingly according to the value of Δ U.At this moment, judge in step S508 that at first whether Δ U is greater than 0.When Δ U＞0, in step S513, increase reference voltage level, make U
Ref=U
Ref+ Δ U when Δ U＜0, reduces reference voltage level in step S512, make U
Ref=U
Ref-Δ U.If in step S506, judge Δ P≤0, then need the magnitude of voltage of each branch road to be adjusted accordingly according to the value of Δ U.At this moment, judge in step S507 that at first whether Δ U is greater than 0.When Δ U＞0, in step S510, reduce reference voltage level, make U
Ref=U
Ref-Δ U when Δ U＜0, increases reference voltage level in step S511, make U
Ref=U
Ref+ Δ U.
Then, in step S514, adjuster judges whether to find the peak power output point,, judges whether Δ U is less than or equal to 2V that is, and the Δ U here is the U that obtains in any one in step S509-S513
RefWith the U that obtains among the step S504
Ref(n) poor.If, then enter into step S516, otherwise enter into step S515, in step S515, Δ T time stand-by period (for example, waiting for for 3 seconds), get in circulation next time, promptly jump to step S501.Need to wait for that the reason of Δ T time is to need the regular hour because control unit is carried out computing,, carry out next circulation time again and preferably stop several seconds in order to guarantee to calculate accurate operation.That is to say that when Δ U≤2V, then MPPT maximal power tracing loop ends when Δ U＞2V, is explained to be much to seek maximum power point, also need continue circulation, satisfy condition up to the magnitude of voltage of Δ U.
In step S516, CVT makes the pairing magnitude of voltage of the peak power output that traces into remain the determined reference voltage level U of adjuster
Ref
In step S517, the conducting duty ratio D of switch controlled unit compute switch pipe K1 (the ON time T of switching tube K1 in the one-period
ONRatio with the switch periods time T), concrete account form is following:
Determined peak power output is put pairing voltage U
RefValue detects the output voltage U of the battery tandem of each branch road photovoltaic array in real time as the output voltage values of BOOST booster circuit
PVThen with U
PVWith the U that confirms
RefValue substitution computes goes out the conducting duty ratio D of switching tube K1:
D＝1-U
PV/U
ref (1)
Then, in step S518, the switch controlled unit sends the ON time that control signal corresponding is come control switch pipe K1 according to the duty ratio D of the switching tube K1 that calculates, at this moment, and the ON time T of switching tube K1
ON=T * D.In this way, promptly controllable switch pipe K1 carries out PWM modulation with high-frequency mode, is the size of the pairing reference voltage level Uref of peak power output up to the magnitude of voltage of each branch road photovoltaic array.
Through above flow process; Can seek the peak power output of each branch road photovoltaic array through repeatedly circulating; The final maximal power tracing of realizing each branch road photovoltaic array so just makes each branch road of input of header box can give the inverter power supply of back level with maximum power all the time.In carrying out the maximal power tracing process; The cell panel of each branch road photovoltaic array (particularly; The battery tandem) peak power output is uncertain, and it is through the maximal power tracing process, just can determine the cell panel Maximum Power Output at last and put pairing reference voltage level; By booster circuit the output voltage of cell panel is boosted to the pairing magnitude of voltage of the determined maximum power point of MPPT then, think that promptly the power output of cell panel this moment reaches maximum.
More than as an example the present invention has been carried out exemplary illustration with the BOOST booster circuit.But; Should be appreciated that; The present invention also can adopt the booster circuit of other type or structure, according to above control principle the booster circuit that is adopted is controlled then, till the output voltage of this booster circuit is the pairing reference voltage level of 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 plus-minus control method shown in Figure 5, also can adopt other alternative manner or searching method to obtain the peak power output of each branch road photovoltaic array.
Below with reference to accompanying drawing and embodiment the present invention is described in detail, still, should be appreciated that, the present invention is not limited to above disclosed exemplary embodiment.Should give claim to explain the most widely, to contain all modification, equivalent structure and the function of disclosed exemplary embodiment.
Claims (7)
1. photovoltaic array header box 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 one road anodal output and negative pole output through the positive and negative busbar that confluxes respectively; 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 that is used to follow the tracks of this branch road;
Control unit, it is used for the peak power output of the photovoltaic array of definite each direct current input branch road, and controls each direct current input branch road and follow the tracks of determined corresponding peak power output.
2. photovoltaic array header box according to claim 1; It is characterized in that; Said each maximal power tracing unit comprises booster circuit; Said control unit is used for according to the output voltage of the photovoltaic array of each direct current input branch road the booster circuit of this direct current input branch road being controlled, and reaches the pairing voltage of peak power output of the photovoltaic array of this direct current input branch road up to the output voltage of this booster circuit.
3. photovoltaic array header box according to claim 2 is characterized in that, said booster circuit is the BOOST booster circuit.
4. photovoltaic array header box according to claim 3; It is characterized in that; Said control unit is used to detect output voltage and the output current that each direct current is imported the photovoltaic array of branch road; If the output voltage that detects is greater than the specified input voltage of said inverter; The switching tube of then controlling in the BOOST booster circuit in this direct current input branch road is in cut-off state, otherwise carries out pulse width modulation according to the switching tube in the output voltage that detects and this BOOST booster circuit of output current control with high-frequency mode, reaches the pairing voltage of peak power output of the photovoltaic array of this direct current input branch road up to the output voltage of this BOOST booster circuit.
5. photovoltaic array header box according to claim 4 is characterized in that, said control unit comprises:
The electric current and voltage sampling unit, it is used to detect output voltage and the output current that each direct current is imported the photovoltaic array of branch road;
Multiplier; It is used for the output voltage and the output current of the photovoltaic array of each the direct current input branch road that detects are multiplied each other; Import the present output power value of the photovoltaic array of branch road to obtain this direct current; And should send comparator to the pairing current reference voltage level of this current output power value by current output power value; Said 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;
Comparator; It is used for the present output power value of the photovoltaic array of each direct current input branch road and current reference voltage level are compared with last output power value and the reference voltage level of following the tracks of, and obtains difference and reference voltage poor of power output that this direct current is imported the photovoltaic array of branch road;
Adjuster; It is used for according to the difference of the power output of the photovoltaic array of each direct current input branch road and the difference of reference voltage current reference voltage level being regulated, and imports the pairing reference voltage level of peak power output of the photovoltaic array of branch road to confirm this direct current;
The constant voltage tracker, it is used to make the pairing magnitude of voltage of the peak power output that traces into to remain the determined reference voltage level of adjuster;
The switch controlled unit; Whether its output voltage of photovoltaic array of each direct current input branch road that is used to judge detection is greater than the specified input voltage of said inverter; If; The switching tube of then controlling in the BOOST booster circuit in this direct current input branch road is in cut-off state; Otherwise the switching tube of controlling in the BOOST booster circuit in this direct current input branch road carries out pulse width modulation with high-frequency mode, reaches the reference voltage level that the constant voltage tracker is kept up to the output voltage of this BOOST booster circuit.
6. photovoltaic array header box according to claim 5 is characterized in that, is in series with the fuse that is used for short-circuit protection respectively between the positive-negative input end of said each direct current input branch road and the positive-negative input end of said maximal power tracing unit, and/or
Said each direct current input branch road positive-negative output end and said positive and negative confluxing are in series with the dc circuit breaker that is used for overcurrent, overvoltage protection between the busbar respectively, and/or
The front end of maximal power tracing unit is connected to the photovoltaic lightning arrester that is used for anti-thunderbolt in said each direct current input branch road.
7. photovoltaic array header box according to claim 1; It is characterized in that; Also comprise communication unit, it is used for sending the output voltage of the photovoltaic array of said each direct current input branch road and the output voltage and the output current of output current and said header box to Surveillance center or host computer.
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