CN105680476A - Direct-current boost concentrated inversion photovoltaic power generation system - Google Patents

Direct-current boost concentrated inversion photovoltaic power generation system Download PDF

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Publication number
CN105680476A
CN105680476A CN201610131575.6A CN201610131575A CN105680476A CN 105680476 A CN105680476 A CN 105680476A CN 201610131575 A CN201610131575 A CN 201610131575A CN 105680476 A CN105680476 A CN 105680476A
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China
Prior art keywords
boosting
direct
direct current
voltage
current
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CN201610131575.6A
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Inventor
刘建发
罗马良
宋芳
刘兵
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Hunan Xinyalin Engineering Technology Co Ltd
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Hunan Xinyalin Engineering Technology Co Ltd
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Priority to CN201610131575.6A priority Critical patent/CN105680476A/en
Priority to CN201620176042.5U priority patent/CN205544327U/en
Publication of CN105680476A publication Critical patent/CN105680476A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • H02J3/383Solar energy, e.g. photovoltaic energy
    • 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 relates to a direct-current boost concentrated inversion photovoltaic power generation system. The photovoltaic power generation system comprises a control unit, multiple direct-current boost power generation units and a concentrated type inverter, wherein each direct-current boost power generation unit comprises direct-current input branches, a direct-current boost cabinet and a DC-DC apparatus; the number of the direct-current input branches is not less than two; the output ends of the multiple direct-current input branches are connected to the input end of the direct-current boost cabinet in parallel; the output end circuits of the multiple direct-current input branches are connected in series in the direct-current boost cabinet; the output end of the direct-current boost cabinet is connected to the input end of one corresponding DC-DC apparatus by a loop; the direct-current cables connected with the output ends of the corresponding DC-DC apparatuses of the respective direct-current boost power generation units are connected in parallel respectively, and then are connected to the direct-current side of the concentrated type inverter; and the alternating current side of the concentrated type inverter is connected to a common medium-high-voltage alternating current power grid. The direct-current boost concentrated inversion photovoltaic power generation system is simple in configuration, low in investment, high in utilization ratio, low in line loss, low in cost, easy to maintain, and high in protection function.

Description

A kind of DC boosting concentrates inversion photovoltaic generating system
Technical field
The present invention relates to solar photovoltaic technology field, specifically a kind of DC boosting concentrates inversion photovoltaic generating system.
Background technology
The energy is economy, social development and the important material improved the people's livelihood, and energy problem is the key of a national development. Along with the increase day by day of photovoltaic generation scale, photovoltaic production capacity is no longer limited to the energy as a supplement, and the direction being towards fungible energy source strides forward. But, unbalanced due to economic development and Renewable resource layout, distance between energy centre and the load center of China is very big, solar electricity generation field as energy centre is concentrated mainly on remote districts, northwest, and the developed area as load center then concentrates on East Coastal; Meanwhile, solar electrical energy generation needs electrical network to provide extra peak, but the peak modulation capacity of remote districts, northwest is not enough, causes that what solar electrical energy generation was faced with large-scale development sends the problem of dissolving outside. Under the impact of this " energy revolution ", the concept of existing photovoltaic generation, the structure of photovoltaic plant, generate electricity by way of merging two or more grid systems device and corresponding running technology are more and more unable to do what one wishes in tackling the dissolving of ultra-large renewable new forms of energy.
And at present, existing solar photovoltaic generation system, is be first low-voltage AC by low-voltage DC by inverter inversion, then again through transformer boost. The photovoltaic module of this solar photovoltaic generation system all adopts low-voltage transmission route between transformator, causes that low-voltage transmission route is long, and line loss is excessive; And often group photovoltaic module corresponding inverter, a transformator, namely multiple photovoltaic modulies need multiple inverter and multiple transformator, and its structure is complicated, investment is big, utilization rate is too low; And multiple header boxs take general series system to the circuit of transformator in existing solar photovoltaic generation system, namely header box is connected outside transformator between two with header box, when system jam, whole system circuit parts need to be overhauled, be not easy to operation.
Summary of the invention
For the problems referred to above, the present invention provides a kind of simple structure, it is little to invest, utilization rate is high, line loss is few, cost is low, easy maintenance, DC boosting that defencive function is strong concentrate inversion photovoltaic generating system.
This invention address that the technical scheme that above-mentioned technical problem adopts is: include control unit, multiple DC boosting generator units and a centralized inverter, each DC boosting generator unit all includes a DC boosting cabinet, DC-DC device and multiple direct current input branch road, the positive-negative input end of each direct current input branch road is respectively connecting to the positive-negative output end of the photovoltaic module of this branch road, the positive-negative output end parallel connection of multiple direct currents input branch road accesses the input of DC boosting cabinet, multiple direct currents are inputted multichannel positive pole and the negative pole series connection that branch circuit parallel connection confluxes by described DC boosting cabinet in cabinet, and export the input to a DC-DC device with primary Ioops from the outfan of DC boosting cabinet, the DC side of centralized inverter is accessed with the outfan of the DC-DC device of each DC boosting generator unit after each direct current cables parallel connection being connected respectively, the AC of described centralized inverter accesses public mesohigh AC network, each direct current input branch road is provided with detection unit and maximal power tracing unit, and described control unit controls the photovoltaic module of each branch road with maximum power output according to each branch voltage and the electric current of detection unit detection. one system of described invention adopt a plurality of can the DC boosting generator unit of synchronous operation side by side, can low-voltage DC variable flow and variable pressure to solar photovoltaic assembly simultaneously, meet the requirement that in the public mesohigh AC network unit interval, demand is big, and adopt and first multiple low-voltage direct electric boosts are become mesohigh unidirectional current, then the method that mesohigh DC inverter is become the mesohigh alternating current required for electrical network by centralized inverter is adopted again, make between DC boosting cabinet and inverter, to adopt the conveying of mesohigh unidirectional current simultaneously, the problem solving the line loss adopting low-voltage AC conveying to cause in prior art between DC boosting cabinet and inverter, reduce cable cost, and direct current cables is compared ac cable and is had better carrier wave stability, it is possible to decrease the installation requirement of electrical secondary system and input, meanwhile, multiple direct currents input branch road of described invention is concentrated and is connected a DC boosting cabinet, solves each direct current input branch road in prior art and connects the boosting problem that cabinet is too much, cost is excessive that a DC boosting cabinet causes, further, the direct current conflux case of the present invention is different from the general of prior art and connects with the connection of DC boosting cabinet, the outfan of the multiple direct current conflux case of the present invention had accessed the input of DC boosting cabinet before this with parallel way, then in DC boosting cabinet, again the outfan circuit of each direct current conflux case is connected between input and the outfan of DC boosting cabinet, this connected mode is when each DC boosting generator unit breaks down, each parallel line can be detected one by one, see specifically which bar circuit there is a problem, solve once circuit goes wrong, need the problem that each parts of whole system must carry out investigating one by one, reduce the scope of repair, improve efficiency, also the effect preventing short circuit and protection is better served, furthermore, in described invention each DC boosting generator unit, multiple mesohigh unidirectional currents are concentrated and are connected a DC-DC device, concentrate by a DC-DC device voltage stabilizing, the DC-DC device solving each header box one DC-DC device of connection in prior art and cause is too much, the problem of inefficiency, also solve the problem that Midwest current/voltage long distance transportation is unstable, and overall, described invention simplifies each parts, centralized management, it is easy to control.
As preferably, described detection unit includes measuring the current detecting unit of described photovoltaic component DC electricity size of current, the voltage detection unit detecting described photovoltaic component DC piezoelectric voltage size and the AD conversion unit for size of current data and voltage swing data convert to digital signal being connected with described current detecting unit and voltage detection unit; Described control unit determines size of current and the voltage swing of described photovoltaic component DC electricity according to digital signal.
As preferably, described maximal power tracing unit includes booster circuit, the booster circuit that this direct current is inputted branch road according to size of current and the voltage swing of the described photovoltaic component DC electricity determined by described control unit is controlled, until the output voltage of this booster circuit reaches the voltage corresponding to peak power output of the photovoltaic module of this direct current input branch road.
As preferably, described detection unit also includes display unit, inputs the input block of control command to described control unit and for the alarm unit of alert when described photovoltaic component DC electricity is beyond preset range and/or during other component malfunctions, and described display unit is for showing the duty of the size of current data of detection, voltage swing data and/or assembly; Input block can facilitate user to be input in joining unit by control information, it is achieved the control to Intelligent photovoltaic combiner box; Fault message and abnormal information can be shown by display unit or send warning by alarm sound by alarm unit, in addition control unit can to input block and alarm unit be turned on and off be controlled.
As preferably, in each DC boosting generator unit, each direct current input branch road includes photovoltaic group string and the direct current conflux case in parallel with photovoltaic group string that the photovoltaic module no less than two is serially connected, and the outfan parallel connection of described direct current conflux case accesses the input of DC boosting cabinet. The photovoltaic module of described invention is in series by multiple, makes photovoltaic module can form more photovoltaic energy after receiving solar energy, and be used for boosting generating; Parallel connection between direct current conflux case and DC boosting cabinet input, is conducive to protection and the maintenance of circuit.
As preferably, in each DC boosting generator unit, the plurality of direct current conflux case is arranged in order, the outfan of described direct current conflux case is divided into cathode output end and cathode output end, the cathode output end of first direct current conflux case being connected with DC boosting cabinet input in DC boosting cabinet and the cathode output end of last direct current conflux case being connected with DC boosting cabinet input, being connected with the outfan of primary Ioops with DC boosting cabinet, the both positive and negative polarity of the outfan of all the other each adjacent direct current conflux cases is connected with each other. So arranging, making multiple mesohigh unidirectional current form a loop output, thus creating condition of contact to connecting a DC-DC device.
As preferably, in each DC boosting generator unit, described DC boosting cabinet includes multiple low-voltage direct chopper and copper bar, and the low-voltage DC in multiple direct current conflux cases is delivered to DC-DC device through copper bar after the boosting of DC boosting cabinet, low-voltage direct current limiting of breaker. Described low-voltage direct chopper the effect that can play protection, current limliting, isolation is set, when the low-voltage DC generation electric current flowed in DC boosting cabinet is excessive, the fault such as line short time, dc circuit breaker can its fault current of disjunction rapidly, protect whole DC boosting and concentrate inversion photovoltaic generating system; The setting of copper bar is relative to general cable, and electric conductivity is high, can faster, safer playing conveying electric current in systems and connect the effect of electrical equipment; And described low-voltage direct chopper is arranged in DC boosting cabinet, can prevent personnel from touching the loss with natural environment.
As preferably, in each DC boosting generator unit, described DC boosting cabinet also includes the dc circuit breaker that input is connected, outfan is connected with DC-DC device with copper bar. Being provided with under the premise of low-voltage direct chopper in described system, after electric current flows through DC boosting cabinet, system is also provided with a dc circuit breaker, plays double protection, it is prevented that mesohigh DC line such as is short-circuited at the fault.
As preferably, described DC-DC device is connected with the DC side of centralized inverter by direct current cables. Direct current cables is compared ac cable and is had better carrier wave stability, it is possible to decrease the installation requirement of electrical secondary system and input.
As preferably, described DC boosting concentration inversion photovoltaic generating system also includes former avris and is connected with centralized inverter, the booster transformer that secondary side is connected with public mesohigh AC network, described direct current conflux case is installed near the photovoltaic module of its correspondence, so that the length of the low-voltage direct cable between the corresponding photovoltaic module of each direct current conflux case is the shortest; This invention addresses some special occasions and need to access the demand of higher electric pressure.
Accompanying drawing explanation
Fig. 1 is the circuit connection structure schematic diagram of a kind of optimal way of the present invention;
Fig. 2 is physical circuit attachment structure schematic diagram in DC boosting cabinet in DC boosting generator unit of the present invention;
Fig. 3 is the structured flowchart of a kind of optimal way of the present invention.
Detailed description of the invention
Describing the present invention in detail below in conjunction with Fig. 1, Fig. 2 and Fig. 3, illustrative examples and explanation in this present invention are used for explaining the present invention, but not as a limitation of the invention.
It should be noted that, the all electric pressures " mesohigh " (no matter being direct current or exchange) occurred in the present invention all covers between 3kV~800kV, such as, its electric pressure can be but not limited to: 5kV, 9kV, 20kV, 35kV, 55kV, 120kV, 220kV, 330kV, 500kV, 760kV etc.
A kind of DC boosting concentrates inversion photovoltaic generating system, including control unit 12, multiple DC boosting generator units 22 and a centralized inverter 10, each DC boosting generator unit all includes a DC boosting cabinet 6, DC-DC device 8 and multiple direct current input branch road 3, the positive-negative input end of each direct current input branch road 3 is respectively connecting to the positive-negative output end of the photovoltaic module 1 of this branch road, the positive-negative output end parallel connection of multiple direct currents input branch road accesses the input of DC boosting cabinet 6, described direct current input branch road 3 is no less than two, multiple direct currents are inputted multichannel positive pole and the negative pole series connection that branch circuit parallel connection confluxes by described DC boosting cabinet in cabinet, and export the input to a DC-DC device 8 with primary Ioops from the outfan of DC boosting cabinet, the DC side of centralized inverter 10 is accessed with the outfan of the DC-DC device of each DC boosting generator unit after each direct current cables 9 parallel connection being connected respectively, the AC of described centralized inverter accesses public mesohigh AC network, each direct current input branch road 3 is provided with detection unit 13 and maximal power tracing unit 14, and described control unit 12 controls the photovoltaic module 1 of each branch road with maximum power output according to each branch voltage and the electric current of detection unit 13 detection. " many " that occur in the present invention all refer to " at least two ", described system is made up of control unit and multiple DC boosting generator unit and a centralized inverter, the low-voltage DC in multiple direct currents input branch road 3 in DC boosting generator unit forms multiple mesohigh unidirectional currents through DC boosting cabinet 6 boosting, the plurality of high pressure direct current connects a DC-DC device 8, concentrate after voltage stabilizing through DC-DC device, then access public mesohigh AC network after being reverse into alternating current by centralized inverter 10, described detection unit 13 includes measuring the current detecting unit 15 of described photovoltaic component DC electricity size of current, the voltage detection unit 17 detecting described photovoltaic component DC piezoelectric voltage size and the AD conversion unit 16 for size of current data and voltage swing data convert to digital signal being connected with described current detecting unit and voltage detection unit, described control unit 12 determines size of current and the voltage swing of described photovoltaic component DC electricity according to digital signal, described maximal power tracing unit 14 includes booster circuit 21, the booster circuit that this direct current is inputted branch road according to size of current and the voltage swing of the described photovoltaic component DC electricity determined by described control unit is controlled, until the output voltage of this booster circuit reaches the voltage corresponding to peak power output of the photovoltaic module of this direct current input branch road, described detection unit also includes display unit 18, inputs the input block 19 of control command to described control unit and for the alarm unit 20 of alert when described photovoltaic component DC electricity is beyond preset range and/or during other component malfunctions, and described display unit is for showing the duty of the size of current data of detection, voltage swing data and/or assembly,
In each DC boosting generator unit, each direct current input branch road 3 includes photovoltaic group string and the direct current conflux case 2 in parallel with photovoltaic group string that the photovoltaic module 1 no less than two is serially connected, and the outfan parallel connection of described direct current conflux case 2 accesses the input of DC boosting cabinet 6.
In each DC boosting generator unit, the plurality of direct current conflux case 2 is arranged in order, the outfan of described direct current conflux case is divided into cathode output end and cathode output end, the cathode output end of first direct current conflux case being connected with DC boosting cabinet input in DC boosting cabinet and the cathode output end of last direct current conflux case being connected with DC boosting cabinet input, being connected with the outfan of primary Ioops with DC boosting cabinet, the both positive and negative polarity of the outfan of all the other each adjacent direct current conflux cases is connected with each other.
In each DC boosting generator unit, described DC boosting cabinet 6 includes multiple low-voltage direct chopper 4 and copper bar 5, and the low-voltage DC in multiple direct current conflux cases 2 boosts through DC boosting cabinet 6, be delivered to DC-DC device 8 through copper bar 5 after low-voltage direct chopper 4 current limliting; Described DC boosting system also includes the dc circuit breaker 7 that input is connected, outfan is connected with DC-DC device with copper bar. Described DC-DC device 8 is connected with the DC side of centralized inverter 10 by direct current cables 9.
In specific implementation process, in each DC boosting generator unit, m, n is no less than 2, m photovoltaic module is connected into a photovoltaic group string, n photovoltaic group string parallel connection accesses n direct current conflux case, direct current conflux case is in parallel after being confluxed by low-voltage DC accesses input in DC boosting cabinet, each input connects with each corresponding low-voltage direct chopper more respectively, the plurality of direct current conflux case is arranged in order, the outfan of described direct current conflux case is divided into cathode output end and cathode output end, the low-voltage direct chopper that multiple that be arranged in order and described n direct current conflux case is corresponding is included in described DC boosting cabinet, the outfan of each low-voltage direct chopper is divided into cathode output end and cathode output end, the cathode output end of the cathode output end of first low-voltage direct chopper and second low-voltage direct chopper is connected by copper bar, the cathode output end of the cathode output end of second low-voltage direct chopper and the 3rd is connected by copper bar, the rest may be inferred, until the cathode output end of last low-voltage direct chopper accesses the input of dc circuit breaker, and the cathode output end of first low-voltage direct chopper also accesses the input of dc circuit breaker, namely a dc circuit breaker is accessed with primary Ioops, the input of the outfan of its dc circuit breaker and a DC-DC device is connected, then the outfan of DC-DC device and the DC side of a centralized inverter are connected, the AC of its centralized inverter is directly accessed electrical network.
When the output voltage UPV of the solar cell tandem of each direct current input branch road is more than or equal to the nominal input voltage Uin of header box rear class connect inverter, i.e. UPV >=Uin, switching tube in MPPT unit is in cut-off state, the output voltage UPV of battery tandem is either directly through inductance and diode, the outfan of MPPT unit is arrived in output, now MPPT unit is without maximal power tracing function, the now output P=Uin*Ipv of each branch road photovoltaic module, wherein, Ipv is the output electric current of each branch road photovoltaic module, this is because now the outfan of header box is connected on the input of inverter, when the output voltage of header box is more than the input voltage of inverter, the output voltage of header box is pulled to the input voltage Uin of inverter by the input direct-current busbar voltage that inverter sets, when each direct current of header box inputs the output voltage UPV of the solar cell tandem of branch road less than the nominal input voltage Uin of the connect inverter of header box rear class, i.e. UPV < Uin, switching tube in MPPT unit carries out pulse width modulation (PWM) with high-frequency mode, the output voltage of corresponding light photovoltaic assembly is carried out boosting rectifier control, until the output voltage of MPPT unit reaches the voltage corresponding to peak power output of corresponding light photovoltaic assembly, now the output of corresponding light photovoltaic assembly reaches maximum.
Described direct current conflux case is installed near the photovoltaic module of its correspondence, so that the length of the low-voltage direct cable between the corresponding photovoltaic module of each direct current conflux case is the shortest, thus effectively reducing DC losses, improves efficiency.
In order to improve the stability of described DC boosting system further, described invention have employed low-voltage direct chopper and dc circuit breaker current limliting, and system and device can accurately be protected from fault harms such as overload, short circuits.
Described DC boosting concentration inversion photovoltaic generating system also includes former avris and is connected with centralized inverter, the booster transformer 11 that secondary side is connected with public mesohigh AC network; When the alternating voltage that the AC of centralized inverter exports is lower than the electric pressure of public mesohigh AC network to be accessed, the alternating voltage of the AC output of centering centralized inverter carries out boosting process, so that it meets the electric pressure of public mesohigh AC network to be accessed, certainly, if the alternating voltage of the AC output of centralized inverter meets the electric pressure of public mesohigh AC network to be accessed, then need not arranging booster transformer, namely the AC of centralized inverter is directly accessed mesohigh AC network. In the present invention, described booster transformer adopts the high-frequency step-up transformer of the high class of insulation, and actual insulation grade and operating frequency range can be chosen according to the running voltage of one group of photovoltaic module of its correspondence voluntarily by those skilled in the art.
The operation principle of the present invention is: native system adopt a plurality of can the DC boosting generator unit of synchronous operation side by side, can low-voltage DC variable flow and variable pressure to solar photovoltaic assembly simultaneously, meet the requirement that in the public mesohigh AC network unit interval, demand is big. in each DC boosting generator unit, solar photovoltaic assembly converts the solar into low-voltage direct electric energy, the requirement of mesohigh alternating current is needed owing to described low-voltage direct electric energy does not meet public electric wire net to be accessed, therefore it is provided with multiple corresponding direct current conflux case to be confluxed by the low-voltage DC of multiple inputs, low-voltage DC after confluxing is after a DC boosting cabinet boosting, export with primary Ioops, again by a DC-DC device voltage stabilizing, mesohigh unidirectional current after voltage stabilizing is then through accessing public electric wire net after the mesohigh alternating current that centralized inverter inversion is required for electrical network, and described control unit can control the photovoltaic module of each branch road with maximum power output according to each branch voltage of detection unit detection and electric current. the grid-connected power station of conventional photovoltaic is compared in described invention, and commutator transformer directly boosts unsteady flow again, and the inverter and the boosting that reduce each generator unit become, and decrease on-site equipment investment and civil engineering, DC boosting cabinet to inverter adopts high voltage direct current conveying, can reduce line loss, reduces cable cost, direct current cables is compared ac cable and is had better carrier wave stability, it is possible to decrease the installation requirement of electrical secondary system and input, simultaneously, in each DC boosting generator unit, the outfan of multiple direct current conflux cases had accessed the input of DC boosting cabinet before this with parallel way, then in DC boosting cabinet, again the outfan circuit of each direct current conflux case is connected between input and the outfan of DC boosting cabinet, when in actual mechanical process, when each DC boosting generator unit breaks down, described connected mode can detect each parallel line one by one, see specifically which bar circuit there is a problem, solve once circuit goes wrong, need the problem that each parts of whole system must carry out investigating one by one, reduce the scope of repair, improve efficiency, also the effect preventing short circuit and protection is better served, described input block can facilitate user to be input in joining unit by control information, it is achieved DC boosting is concentrated the control of inversion photovoltaic generating system, and input block can be button, can control command be input in detection module by button. in order to enable DC boosting to concentrate the duty of inversion photovoltaic generating system each assembly to be found in time when occurring abnormal, alarm unit can also be set in detection unit in the application, when certain in joining unit or some component malfunctions, or it is input to the electric current in joining unit and occurs abnormal, such as overvoltage or under-voltage, fault message and abnormal information can be shown by display unit or send warning by alarm sound by alarm unit, in addition control unit can to input block and alarm unit be turned on and off be controlled.
The technical scheme above embodiment of the present invention provided is described in detail, principle and the embodiment of the embodiment of the present invention are set forth by specific case used herein, and the explanation of above example is only applicable to help to understand the principle of the embodiment of the present invention; Simultaneously for one of ordinary skill in the art, according to the embodiment of the present invention, all will change in detailed description of the invention and range of application, in sum, this specification content should not be construed as limitation of the present invention.

Claims (10)

1. a DC boosting concentrates inversion photovoltaic generating system, it is characterized in that: include control unit (12), multiple DC boosting generator units (22) and a centralized inverter (10), each DC boosting generator unit (22) all includes a DC boosting cabinet (6), DC-DC device (8) and multiple direct current input branch road (3), the positive-negative input end of each direct current input branch road (3) is respectively connecting to the positive-negative output end of the photovoltaic module (1) of this branch road, the positive-negative output end parallel connection of multiple direct currents input branch road (3) accesses the input of DC boosting cabinet (6), multiple direct currents are inputted multichannel positive pole and the negative pole series connection that branch road (3) parallel connection is confluxed by described DC boosting cabinet (6) in cabinet, and export the input to a DC-DC device (8) with primary Ioops from the outfan of DC boosting cabinet (6), the DC side of centralized inverter (10) is accessed with the outfan of the DC-DC device (8) of each DC boosting generator unit (22) after each direct current cables (9) parallel connection being connected respectively, the AC of described centralized inverter (10) accesses public mesohigh AC network, each direct current input branch road (3) is provided with detection unit (13) and maximal power tracing unit (14), described control unit (12) controls the photovoltaic module of each branch road with maximum power output according to detection unit (13) each branch voltage of detecting and electric current.
2. DC boosting concentrates inversion photovoltaic generating system according to claim 1, it is characterised in that: described detection unit (13) includes measuring the current detecting unit (15) of described photovoltaic component DC electricity size of current, the voltage detection unit (17) detecting described photovoltaic component DC piezoelectric voltage size and the AD conversion unit (16) for size of current data and voltage swing data convert to digital signal being connected with described current detecting unit and voltage detection unit; Described control unit (12) determines size of current and the voltage swing of described photovoltaic component DC electricity according to digital signal.
3. concentrate inversion photovoltaic generating system according to the DC boosting of claim 2 institute-state, it is characterized in that: described maximal power tracing unit (14) includes booster circuit (21), the booster circuit (21) that this direct current is inputted branch road (3) according to size of current and the voltage swing of the described photovoltaic component DC electricity determined by described control unit (12) is controlled, until the output voltage of this booster circuit reaches the voltage corresponding to peak power output of the photovoltaic module of this direct current input branch road.
4. DC boosting concentrates inversion photovoltaic generating system according to claim 2, it is characterized in that: described detection unit (13) also includes display unit (18), inputs the input block (19) of control command to described control unit and for the alarm unit (20) of alert when described photovoltaic component DC electricity is beyond preset range and/or during other component malfunctions, and described display unit is for showing the duty of the size of current data of detection, voltage swing data and/or assembly.
5. DC boosting concentrates inversion photovoltaic generating system according to claim 1, it is characterized in that, in each DC boosting generator unit (22), each direct current input branch road (3) includes photovoltaic group string and the direct current conflux case (2) in parallel with photovoltaic group string that the photovoltaic module (1) no less than two is serially connected, and the outfan parallel connection of described direct current conflux case (2) accesses the input of DC boosting cabinet (6).
6. DC boosting concentrates inversion photovoltaic generating system according to claim 5, it is characterized in that: in each DC boosting generator unit, the plurality of direct current conflux case (2) is arranged in order, the outfan of described direct current conflux case is divided into cathode output end and cathode output end, the cathode output end of first direct current conflux case (2) being connected with DC boosting cabinet input in DC boosting cabinet and the cathode output end of last direct current conflux case being connected with DC boosting cabinet input, it is connected with the outfan of primary Ioops with DC boosting cabinet, the both positive and negative polarity of the outfan of all the other each adjacent direct current conflux cases is connected with each other.
7. according to claim 1 or 6, DC boosting concentrates inversion photovoltaic generating system, it is characterized in that: in each DC boosting generator unit, described DC boosting cabinet (6) includes multiple low-voltage direct chopper (4) and copper bar (5), and the low-voltage DC in multiple direct current conflux cases (2) is delivered to a DC-DC device (8) through copper bar (5) after DC boosting cabinet (6) boosting, low-voltage direct chopper (4) current limliting.
8. DC boosting concentrates inversion photovoltaic generating system according to claim 7, it is characterized in that: in each DC boosting generator unit, described DC boosting cabinet also includes the dc circuit breaker (7) that input is connected, outfan is connected with DC-DC device (8) with copper bar (5).
9. DC boosting concentrates inversion photovoltaic generating system according to claim 8, it is characterised in that: described DC-DC device (8) is connected by the DC side of direct current cables (9) with centralized inverter (10).
10. DC boosting concentrates inversion photovoltaic generating system according to claim 5, it is characterized in that: described DC boosting concentration inversion photovoltaic generating system also includes former avris and is connected with centralized inverter (10), the booster transformer (11) that secondary side is connected with public mesohigh AC network, described direct current conflux case (2) is installed near the photovoltaic module (1) of its correspondence, so that the length of the low-voltage direct cable between the corresponding photovoltaic module of each direct current conflux case is the shortest.
CN201610131575.6A 2016-03-09 2016-03-09 Direct-current boost concentrated inversion photovoltaic power generation system Pending CN105680476A (en)

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