CN204578458U - A kind of header box circuit structure and photovoltaic generating system - Google Patents
A kind of header box circuit structure and photovoltaic generating system Download PDFInfo
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- CN204578458U CN204578458U CN201520130598.6U CN201520130598U CN204578458U CN 204578458 U CN204578458 U CN 204578458U CN 201520130598 U CN201520130598 U CN 201520130598U CN 204578458 U CN204578458 U CN 204578458U
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Abstract
The utility model discloses a kind of header box circuit structure and photovoltaic generating system, this header box circuit structure comprises outlet line and exports the circuit basic topology unit of outlet line for the Cheng Yilu that confluxed by several photovoltaic group strings in photovoltaic module array to, several photovoltaic group strings are divided into more than one group, each group photovoltaic group string is all connected with outlet line by a circuit basic topology unit, and circuit basic topology unit comprises the input be connected successively and to conflux power supply unit, DC/DC boosting inverter unit and output power distribution unit.This photovoltaic generating system comprises photovoltaic DC-to-AC converter and several above-mentioned header box circuit structures, and the outlet line of each header box circuit structure is connected in parallel to photovoltaic DC-to-AC converter.The utility model has MPPT function and the photovoltaic DC that wide region changes can be stable into the direct current output of high voltage grade, can elevator system energy output, raising power density, reduction inverter system floor space and system cost.
Description
Technical field
The utility model relates to technical field of photovoltaic power generation, is specifically related to a kind of header box circuit structure and photovoltaic generating system.
Background technology
At present, solar photovoltaic generation system achieves large-scale application, and monolithic solar photovoltaic battery component output direct current has the advantages that voltage is less, electric current is less, by the photovoltaic group string of the appropriate voltage level in series of polylith solar photovoltaic battery component in photovoltaic generating system, by using photovoltaic combiner box, suitable high current grade is confluxed in the parallel connection of the DC low current of multiple photovoltaic group string, several photovoltaic combiner boxes final export access photovoltaic DC-to-AC converter, convert the alternating current feed-in electrical network of accessible electrical network through inverter inversion to.
Such as, Authorization Notice No. is the utility model patent of CN 203434932 U, the utility model patent of Authorization Notice No. to be the utility model patent of CN 203788239 U and application publication number be CN 104158482 A individually discloses a kind of existing header box and photovoltaic generating system.
Existing large-sized photovoltaic electricity generation system is only confluxed by multichannel photovoltaic group string DC parallel, centralized generating is realized by 1 Large Copacity photovoltaic DC-to-AC converter, there is system in combination power loss, MPPT(maximum power point tracking, tracing control is carried out to the change of the output voltage produced because of the change of photovoltaic module surface temperature and solar irradiance change and electric current, make photovoltaic cell component square formation remain on the operating state of maximum output always, to obtain the automatic adjustment behavior of maximum power stage, below unifiedly being called for short " MPPT ") way is few, DC voltage range is wide, the problems such as system voltage level is low, concrete manifestation is as follows:
1, due to self otherness and photovoltaic array large area distribution varying environment factor impact (pollution level, degree of aging etc.) of photovoltaic cell component, the output total voltage of each photovoltaic group string cannot be identical, causes the maximum power of each photovoltaic group string also can be variant.The parallel connection being input as all photovoltaic cell group strings of every platform photovoltaic DC-to-AC converter in existing photovoltaic generating system, cannot realize each photovoltaic group string and be operated in maximum power point, and then reduce systems generate electricity amount and generating efficiency, there is system in combination loss.
2, in existing photovoltaic generating system, the general Large Copacity photovoltaic DC-to-AC converter of photovoltaic DC-to-AC converter only has 1 road MPPT function, poor to the matching of Large Copacity large area photovoltaic cell component square formation, and cloudy weather more will aggravate system in combination loss.
3, the open-voltage level of existing photovoltaic generating system DC side is less than 1000V, and maximum power point voltage work has been limited in 450 ~ 700V:
1) on the one hand, inverter output voltage is limited in 315Vac, and the conventional maximum input current of 500kW photovoltaic DC-to-AC converter direct current is generally 1100A; If desired increase inverter output power further, then the input current of inverter synchronously increases, and causes the semiconductor power device and the switching device that need more big current grade, and the cost of whole photovoltaic generating system will sharply rise.
2) on the other hand, for meeting practical application, normal employing two 500kW photovoltaic inverter system form 1MW generator units, and floor space is larger.
3) in addition, electricity generation system DC voltage excursion is comparatively large, and direct current excursion is wider, amasss type selecting higher to the cross-section of cable, and need carry out type selecting according to high current grade, system cost is higher.
For the assembling loss of existing centralized photovoltaic generation and the few defect of MPPT way, existing photovoltaic generating system has employing group serial type photovoltaic DC-to-AC converter distributed power generation scheme, namely adopt the photovoltaic DC-to-AC converter distributed grid-connected of multiple low capacity to generate electricity and substitute original 1 high-power photovoltaic inverter generating, each group serial type photovoltaic DC-to-AC converter is just bordering on each sub-photovoltaic arrays to offset DC line influencing factor and matching optimization photovoltaic array.But there is interchange and export the shortcomings such as cable is numerous, system complex, system cost are higher in this kind of way in large-sized photovoltaic power station.
Along with industry development; also there is some group string datas MPPT header box; the DC/DC converter that one or more can carry out maximal power tracing is increased at the outlet side of photovoltaic group string; carry out MPPT control by BOOST boost pressure circuit, but there is input, output protection lacks, security reliability is low etc. shortcoming in whole circuit system structure.
How get both centralized photovoltaic generating system and group serial type photovoltaic DC-to-AC converter distributed generation system advantage simultaneously, and elevator system energy output, reduces unit site area, becomes the direction that photovoltaic industry is made great efforts.
Utility model content
The technical problems to be solved in the utility model is the deficiency overcoming prior art existence, provides a kind of header box circuit structure and photovoltaic generating system.
For solving the problems of the technologies described above, the utility model by the following technical solutions:
A kind of header box circuit structure, comprise outlet line and export the circuit basic topology unit of outlet line for the Cheng Yilu that confluxed by several photovoltaic group strings in photovoltaic module array to, described in several, photovoltaic group string is divided into more than one group, each group photovoltaic group string is all connected with described outlet line by a described circuit basic topology unit, and described circuit basic topology unit comprises the input be connected successively and to conflux power supply unit, DC/DC boosting inverter unit and output power distribution unit.
As further improvement of the utility model:
Described DC/DC boosting inverter unit comprises alternating expression BOOST booster circuit in parallel, and the way in parallel of described alternating expression BOOST booster circuit in parallel is two-way or three roads or four tunnels, and is equipped with corresponding BOOST inductance, electric capacity and voltage and current detecting unit.
The alternating expression BOOST booster circuit in parallel of described DC/DC boosting inverter unit is two-way alternating expression BOOST booster circuit in parallel, and the circuit of described DC/DC boosting inverter unit specifically comprises:
The input and output capacitors of two-way alternating expression BOOST booster circuit, described input and output capacitors lays respectively at input side and the outlet side of DC/DC boosting inverter unit, and is parallel in direct current major loop;
The BOOST inductance of two-way alternating expression BOOST booster circuit, described BOOST inductance is series in two BOOST boosting input major loops, two loops that described BOOST inductance comprises the first inductance L 1 and the second inductance L 2, first inductance L 1 and the second inductance L 2 place are parallel form;
Device for power switching module, described device for power switching module integration has 2 IGBT components and parts and four diode components and parts, 2 IGBT components and parts and wherein two diode components and parts form two BOOST main circuit loops in parallel, and another two diode components and parts form the bypass diode loop of two BOOST circuit in parallel; The input in described bypass diode loop and the input side of described BOOST inductance are connected to described input and conflux the direct current right way output of power supply unit, are connected to the positive terminal of input of described output power distribution unit together with the output in bypass diode loop exports with two BOOST circuit in parallel; The bypass diode loop conducting when the output of header box input voltage higher than DC/DC boosting inverter unit, DC/DC boosting inverter unit quits work.
The described input power supply unit that confluxes comprises the first bus rod, be connected to one in each group between each photovoltaic group string and the first bus rod to conflux branch line, the branch line that respectively confluxes is in series with branch line fuse, and described first bus rod is connected with DC/DC boosting inverter unit by a circuit on-off control switch.
Respectively conflux detecting unit branch line is also in series with for detecting photovoltaic group string input current; The output of described first bus rod is parallel with the first lightning protection device.
Described output power distribution unit is by the circuit control switch for control circuit break-make and form for the fuse of route protection, and described circuit control switch and fuse are series in the output DC loop being connected DC/DC boosting inverter unit output and outlet line.
The quantity of described photovoltaic group string is n, and n photovoltaic group string is divided into a group, and a >=2; When n/a is integer, n photovoltaic group string is divided into a group; When n/a is non-integer, n photovoltaic group string is divided into a+1 group, wherein, a n/a gained remainder photovoltaic group string is one group, and other photovoltaic group strings are divided into a group.
The circuit basic topology unit of each group of photovoltaic group string is connected with described outlet line by the second bus rod.
The output of described second bus rod is also parallel with the second lightning protection device.
A kind of photovoltaic generating system, comprise photovoltaic DC-to-AC converter and several above-mentioned header box circuit structures stated, the outlet line of each header box circuit structure is connected in parallel to described photovoltaic DC-to-AC converter.
Compared with prior art, the utility model has the advantage of: header box circuit structure of the present utility model confluxes between power supply unit and output power distribution unit in the input of traditional header box circuit topological structure and seals in DC/DC boosting inverter unit, DC/DC boosting inverter unit has MPPT function and the photovoltaic DC that wide region changes can be stable into the direct current output of high voltage grade, in perfect the confluxing of configuration, on the safety protective circuit basis of distribution, the photovoltaic voltage achieving photovoltaic group string wide region change corresponding when photovoltaic generating system works is stable into high voltage hierarchy level, and be same electric pressure, thus reduce photovoltaic combiner box output current and photovoltaic DC-to-AC converter input current grade, the electric pressure that photovoltaic DC-to-AC converter inversion conversion exports also can improve.When photovoltaic DC-to-AC converter current class is constant, the photovoltaic combiner box that can be accessed by greater number and the photovoltaic cell component array mated, thus when photovoltaic DC-to-AC converter constancy of volume, promote the power density of photovoltaic generating system capacity and photovoltaic DC-to-AC converter.This header box circuit structure realizes based on the target that the voltage levvl on the constant basis of photovoltaic inverter system I/O electric current promotes and power grade rises thereupon, the effect namely reaching elevator system energy output, improve power density, reduce inverter system floor space and system cost.Further, divide+configure the BOOST booster voltage circuit of several Corresponding matchings+configure several Corresponding matching output power distribution units+configuration to export bus rod by the some quantity of power supply unit of confluxing to its multiple input, some roads MPPT function of the photovoltaic array that the coupling that can realize traditional header box is confluxed, photovoltaic array system MPPT way is risen to the product value of the circuit basic topology element number of header box quantity and header box by 1 traditional road, significantly improve photovoltaic system MPPT ability and energy output.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of existing header box circuit formation and photovoltaic generating system.
Fig. 2 is the circuit theory diagrams of the first header box circuit structure of the utility model.
Fig. 3 is the circuit theory diagrams of the utility model the second header box circuit structure.
Fig. 4 is the circuit theory diagrams of the utility model photovoltaic generating system.
Marginal data:
1, the power supply unit that confluxes is inputted; 101, branch line fuse; 102, detecting unit; 103, the first bus rod; 104, the first lightning protection device; 105, circuit on-off control switch; 2, output power distribution unit; 3, DC/DC boosting inverter unit; 301, input capacitance; 302, BOOST inductance; 303, device for power switching module; 304, output capacitance; 4, the second bus rod; 5, outlet line; 6, the second lightning protection device; 7, photovoltaic DC-to-AC converter.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is that existing header box circuit is formed and photovoltaic generating system: header box A1 is made up of conflux power supply unit 1 and output power distribution unit 2 of input, is realized confluxing into a road larger current to the parallel connection of multichannel photovoltaic group string (in figure, n is generally 16) small area analysis exported by conflux distribution and output distribution of input; The header box output current of multiple header box (in figure, m is generally 7) inputs to photovoltaic DC-to-AC converter 7; Photovoltaic DC-to-AC converter 7 corresponds to 7 conventional header box inputs and is generally specified 500kW power grade, each header box is only realize collecting of numerous groups of string small area analysis, (photovoltaic DC voltage change range is 0 ~ 1000V not do voltage transformation, general photovoltaic DC-to-AC converter MPPT operating voltage range is DC450V ~ 700V), not there is MPPT function.
Fig. 2 shows the first header box circuit structure of the present utility model, this header box circuit structure (A2) comprises outlet line 5 and exports the circuit basic topology unit of outlet line 5 for the Cheng Yilu that confluxed by several photovoltaic group strings in photovoltaic module array to, several photovoltaic group strings are all connected with outlet line 5 by a circuit basic topology unit, also be that several photovoltaic group strings are as one group, circuit basic topology unit comprises the input be connected successively and to conflux power supply unit 1, DC/DC boosting inverter unit 3 and output power distribution unit 2, wherein, DC/DC boosting inverter unit 3 has MPPT function and the photovoltaic DC that wide region changes can be stable into the direct current output of high voltage grade.This header box circuit structure perfect to conflux in configuration, on the safety protective circuit basis of distribution; the photovoltaic voltage achieving photovoltaic group string wide region change corresponding when photovoltaic generating system works is stable into high voltage hierarchy level; and be same electric pressure (such as 800V); thus reduce photovoltaic combiner box output current and photovoltaic DC-to-AC converter input current grade; the electric pressure that photovoltaic DC-to-AC converter inversion conversion exports also can improve (such as input DC800V, the specified alternating voltage grade that inversion conversion exports can be promoted to AC500V).When photovoltaic DC-to-AC converter current class is constant, the photovoltaic combiner box that can be accessed by greater number and the photovoltaic cell component array mated, thus when photovoltaic DC-to-AC converter constancy of volume, promote the power density of photovoltaic generating system capacity and photovoltaic DC-to-AC converter.This header box circuit structure realizes based on the target that the voltage levvl on the constant basis of photovoltaic inverter system I/O electric current promotes and power grade rises thereupon, the effect namely reaching elevator system energy output, improve power density, reduce inverter system floor space and system cost.
In the present embodiment, as shown in Figure 4, DC/DC boosting inverter unit 3 comprises alternating expression BOOST booster circuit in parallel, alternating expression parallel connection BOOST booster circuit is the alternating expression BOOST booster circuit topology in parallel of DC/DC field of switch power maturation application, exports for realizing becoming to stablize high voltage grade direct current to the photovoltaic DC MPPT inputting the power supply unit 1 that confluxes with boosting inverter.The way in parallel of this alternating expression BOOST booster circuit in parallel is two-way or three roads or four tunnels, and is equipped with corresponding BOOST inductance, electric capacity and voltage and current detecting unit.
Concrete, the alternating expression BOOST booster circuit in parallel of above-mentioned DC/DC boosting inverter unit 3 is two-way alternating expression BOOST booster circuit in parallel, two IGBT device and four diode components are integrated with in its chopped power switching device IGBT module, wherein two diode components are as BOOST main circuit loop diode, and two other diode component is as BOOST circuits bypass diode; The circuit of DC/DC boosting inverter unit 3 specifically comprises:
The input capacitance 301 of two-way alternating expression BOOST booster circuit and output capacitance 304, input capacitance 301 and output capacitance 304 lay respectively at input side and the outlet side of DC/DC boosting inverter unit 3, and are parallel in direct current major loop;
The BOOST inductance 302 of two-way alternating expression BOOST booster circuit, BOOST inductance 302 is series in two BOOST boosting input major loops, two loops that BOOST inductance 302 comprises the first inductance L 1 and the second inductance L 2, first inductance L 1 and the second inductance L 2 place are parallel form;
Device for power switching module 303, device for power switching module 303 is integrated with 2 IGBT components and parts and four diode components and parts, 2 IGBT components and parts and wherein two diode components and parts form two BOOST main circuit loops in parallel, and another two diode components and parts form the bypass diode loop of two BOOST circuit in parallel; The input in bypass diode loop and the input side of BOOST inductance 302 are connected to the direct current right way output inputting the power supply unit 1 that confluxes, and are connected to the positive terminal of input of output power distribution unit 2 together with the output in bypass diode loop exports with two BOOST circuit in parallel; The bypass diode loop conducting when the output of header box input voltage higher than DC/DC boosting inverter unit 3, DC/DC boosting inverter unit 3 quits work.
In the present embodiment, as shown in Figure 4, input power supply unit 1 and the input of the existing header box power supply unit 1 that confluxes that confluxes is identical, is the parallel form that confluxes of multichannel photovoltaic group string input direct-current.It comprises the first bus rod 103; be connected to one in each group between each photovoltaic group string and the first bus rod 103 to conflux branch line; the branch line that respectively confluxes is in series with branch line fuse 101; branch line fuse 101 plays protection system; first bus rod 103 is connected with DC/DC boosting inverter unit 3 by a circuit on-off control switch 105, and circuit on-off control switch 105 is for circuit on-off operation/control.Respectively conflux the detecting unit 102 branch line is also in series with for detecting photovoltaic group string input current, and this detecting unit 102 adopts prior art; The output of the first bus rod 103 is parallel with the first lightning protection device 104, for the input side lightning protection of header box.Above-mentioned circuit on-off control switch 105 and the first lightning protection device 104 can need apolegamy according to practical application.
In the present embodiment; as shown in Figure 4; output power distribution unit 2 is by the circuit control switch for operating control circuit break-make and form for the fuse of route protection, and circuit control switch and fuse are series in the output DC loop being connected DC/DC boosting inverter unit 3 output and outlet line 5.
In the present embodiment, as shown in Figure 4, the output of the second bus rod 4 is also parallel with the second lightning protection device 6, for the lightning protection of the outlet side of header box.
Fig. 3 shows the second header box circuit structure of the present utility model, this header box circuit structure is substantially identical with the first header box circuit structure, unlike, several photovoltaic group strings are divided into more than two, and specifically, the quantity of several photovoltaic group strings is n, n photovoltaic group string is divided into a group, and a >=2, n/a is integer, and n photovoltaic group string is divided into a group; Like this, also correspondingly in header box circuit structure be provided with a circuit basic topology unit (A201 ~ A20a see in Fig. 3), each group of photovoltaic group string is connected with the second bus rod 4 respectively by a circuit basic topology unit, second bus rod 4 is connected with outlet line 5 again, is exported by the high voltage grade stable DC of a circuit basic topology unit and to be confluxed Cheng Yilu being exported by outlet line 5 by the second bus rod 4.
This header box circuit structure can meet the multiple MPPT function of photovoltaic module array of n photovoltaic group string of separate unit header box coupling further, achieve a the MPPT function to n photovoltaic group string, photovoltaic array system MPPT way is risen to the product value of the circuit basic topology element number of header box quantity and header box by 1 traditional road, significantly improve photovoltaic system MPPT ability and energy output.
In other embodiments, when n/a is non-integer, n photovoltaic group string is divided into a+1 group, wherein, a n/a gained remainder photovoltaic group string is one group, and other photovoltaic group strings are divided into a group.
Fig. 4 also show a kind of photovoltaic generating system of the present utility model, and this photovoltaic generating system comprises photovoltaic DC-to-AC converter 7 and several above-mentioned the second header box circuit structures, and the outlet line 5 of each header box circuit structure is connected in parallel to photovoltaic DC-to-AC converter 7.Photovoltaic DC-to-AC converter 7 converts suitable high voltage grade alternating current feed-in electrical network to the DC inversion mating DC input voitage grade.
In addition, photovoltaic generating system of the present utility model can also adopt photovoltaic DC-to-AC converter 7 and several the first header box circuit structures above-mentioned to combine.
The above is only preferred implementation of the present utility model, and protection range of the present utility model is also not only confined to above-described embodiment.For those skilled in the art, do not departing from the improvement that obtains under the utility model technical conceive prerequisite and conversion also should be considered as protection range of the present utility model.
Claims (10)
1. a header box circuit structure, comprise outlet line (5) and export the circuit basic topology unit of outlet line (5) for the Cheng Yilu that confluxed by several photovoltaic group strings in photovoltaic module array to, described in several, photovoltaic group string is divided into more than one group, each group photovoltaic group string is all connected with described outlet line (5) by a described circuit basic topology unit, it is characterized in that: described circuit basic topology unit comprises input connected successively and to conflux power supply unit (1), DC/DC boosting inverter unit (3) and output power distribution unit (2).
2. header box circuit structure according to claim 1, it is characterized in that: described DC/DC boosting inverter unit (3) comprises alternating expression BOOST booster circuit in parallel, the way in parallel of described alternating expression BOOST booster circuit in parallel is two-way or three roads or four tunnels, and is equipped with corresponding BOOST inductance, electric capacity and voltage and current detecting unit.
3. header box circuit structure according to claim 2, it is characterized in that: the alternating expression BOOST booster circuit in parallel of described DC/DC boosting inverter unit (3) is two-way alternating expression BOOST booster circuit in parallel, and the circuit of described DC/DC boosting inverter unit (3) specifically comprises:
The input capacitance (301) of two-way alternating expression BOOST booster circuit and output capacitance (304), described input capacitance (301) and output capacitance (304) lay respectively at input side and the outlet side of DC/DC boosting inverter unit (3), and are parallel in direct current major loop;
The BOOST inductance (302) of two-way alternating expression BOOST booster circuit, described BOOST inductance (302) is series in two BOOST boosting input major loops, two loops that described BOOST inductance (302) comprises the first inductance L 1 and the second inductance L 2, first inductance L 1 and the second inductance L 2 place are parallel form;
Device for power switching module (303), described device for power switching module (303) is integrated with 2 IGBT components and parts and four diode components and parts, 2 IGBT components and parts and wherein two diode components and parts form two BOOST main circuit loops in parallel, and another two diode components and parts form the bypass diode loop of two BOOST circuit in parallel; The input in described bypass diode loop and the input side of described BOOST inductance (302) are connected to described input and conflux the direct current right way output of power supply unit (1), are connected to the positive terminal of input of described output power distribution unit (2) together with the output in bypass diode loop exports with two BOOST circuit in parallel; The bypass diode loop conducting when the output of header box input voltage higher than DC/DC boosting inverter unit (3), DC/DC boosting inverter unit (3) quits work.
4. header box circuit structure according to claim 1, it is characterized in that: the described input power supply unit (1) that confluxes comprises the first bus rod (103), be connected to one in each group between each photovoltaic group string and the first bus rod (103) to conflux branch line, the branch line that respectively confluxes is in series with branch line fuse (101), and described first bus rod (103) is connected with DC/DC boosting inverter unit (3) by a circuit on-off control switch (105).
5. header box circuit structure according to claim 4, is characterized in that: the branch line that respectively confluxes also is in series with the detecting unit (102) for detecting photovoltaic group string input current; The output of described first bus rod (103) is parallel with the first lightning protection device (104).
6. header box circuit structure according to claim 1; it is characterized in that: described output power distribution unit (2) is by the circuit control switch for control circuit break-make and form for the fuse of route protection, and described circuit control switch and fuse are series in the output DC loop being connected DC/DC boosting inverter unit (3) output and outlet line (5).
7. header box circuit structure according to any one of claim 1 to 6, is characterized in that: the quantity of described photovoltaic group string is n, and n photovoltaic group string is divided into a group, and a >=2; When n/a is integer, n photovoltaic group string is divided into a group; When n/a is non-integer, n photovoltaic group string is divided into a+1 group, wherein, a n/a gained remainder photovoltaic group string is one group, and other photovoltaic group strings are divided into a group.
8. header box circuit structure according to claim 7, is characterized in that: the circuit basic topology unit of each group photovoltaic group string is connected with described outlet line (5) by the second bus rod (4).
9. header box circuit structure according to claim 8, is characterized in that: the output of described second bus rod (4) is also parallel with the second lightning protection device (6).
10. a photovoltaic generating system, it is characterized in that: comprise photovoltaic DC-to-AC converter (7) and several header box circuit structures according to any one of right 1 ~ 9, the outlet line (5) of each header box circuit structure is connected in parallel to described photovoltaic DC-to-AC converter (7).
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| CN107560039A (en) * | 2017-08-31 | 2018-01-09 | 珠海格力电器股份有限公司 | PV air-conditioner adapter and PV air-conditioner system |
| CN110932310A (en) * | 2019-11-08 | 2020-03-27 | 华为技术有限公司 | Photovoltaic control device, method and system |
| WO2021088491A1 (en) * | 2019-11-08 | 2021-05-14 | 华为技术有限公司 | Photovoltaic control apparatus and method, and system |
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| CN113508506B (en) * | 2020-12-31 | 2022-09-16 | 华为数字能源技术有限公司 | Photovoltaic power generation system, photovoltaic inverter and direct current collection flow box |
| CN113872245A (en) * | 2021-11-05 | 2021-12-31 | 阳光电源股份有限公司 | Distributed inversion system and starting method thereof |
| CN113872245B (en) * | 2021-11-05 | 2024-04-12 | 阳光电源股份有限公司 | Distributed inversion system and starting method thereof |
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