JP2006041440A - Ac module, its manufacturing method, and solar energy power generating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a reliability of an AC (alternating current) module, by reducing the mechanical load on wiring members electrically connecting a DC-DC converter with a photoelectromotive element. <P>SOLUTION: In the AC module, in which the DC-DC converter is electrically connected with each serial connecting objects via the wiring members, and an inverter having an output cable is electrically connected with the DC-DC converter via parallel connecting members, having a plurality of pieces of the serial connecting objects of photoelectromotive elements consisting of at least one piece of the photoelectromotive element; a gap is formed in adjacent 2 pieces of the photoelectromotive elements or the serial connecting members; the gap arranges the DC-DC converter in a region in which a forming phtoelectromotive element does not exist; furthermore, at least one part of the above-mentioned parallel connecting members are fixed to a non-light-receiving surface side of the photoelectromotive element. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an AC module, a manufacturing method thereof, and a photovoltaic power generation system.

  As environmental problems become more serious, attention to solar power generation systems that use inexhaustible and clean solar energy has been increasing year by year.

  Many solar power generation systems installed on roofs of public houses, rooftops of public facilities, power plants, etc., are configured by connecting a plurality of solar cell modules 10 in series and parallel as shown in FIG. It consists of a battery array 11, a current collection box 12 that collects the DC power generated by the solar cell array, and a power converter 13 that converts the collected power into AC power. (See Patent Document 1).

Currently, the above system form is the mainstream, but targeting DC power generated by photovoltaic devices, targeting DC power generated by photovoltaic devices, and DC power after boosting, targeting small and medium-scale power generation systems and emergency power supplies. Development of an AC output solar cell module (hereinafter referred to as an “AC module”) in which a small inverter for converting to AC power is integrated has been actively conducted.
JP 07-168638 A

  The present inventors have been studying the cost reduction of the AC module, and considered the AC module as shown in FIG. The AC module has a plurality of series-connected bodies in which two photovoltaic elements 20 are connected in series. A wiring member 21 is electrically connected to the positive electrode and the negative electrode of each series connection body, and the wiring member is electrically connected to the input terminal of the DC-DC converter 22. The DC power generated by the photovoltaic device is a large current and low voltage, and if the distance between the wiring material that electrically connects the DC-DC converter and the photovoltaic device is long, the power loss in the wiring material increases. The DC converter is disposed at a position in FIG. 2 where the distance from both electrodes of the series connection body is short, and the distance between the DC-DC converter and the photovoltaic element is short.

  One inverter 26 having an output cable 24 is provided at the corner of the AC module, and the output terminal of each DC-DC converter is electrically connected to the input terminal of the inverter by a parallel connection member 23.

  The photovoltaic element has a structure sealed with a covering material 25 in order to improve environmental resistance. Here, the covering material 25 does not seal the DC-DC converter and the inverter because the DC-DC converter and the inverter are weak against heat as compared with the photovoltaic element, and the covering material is heated to the photovoltaic element. This is because the DC-DC converter and the inverter are thicker than the photovoltaic element, so that bubbles remain in the coating material and wrinkles are generated. This is because the film cannot be coated well.

  Since the AC module can supply the same frequency and voltage as commercial power independently, the AC module can be carried to another place and used as an independent power source in an emergency. In addition, AC modules can be installed in units of one sheet, and the initial investment burden is small, so it can be installed with a small amount of funds. Furthermore, there is a merit that it can be installed in any place and expansion can be easily performed.

  However, the AC module shown in FIG. 2 has the following problems.

  That is, when carrying the AC module at the construction site, the operator grasps the photovoltaic elements existing at both ends of the AC module or the covering material existing in the vicinity thereof, so that the parallel connection member and the DC-DC converter are wired. It will be supported only by the material. Therefore, when an operator hooks the parallel connection member during transportation and construction, there is a high possibility that force concentrates on the wiring material and the wiring material is damaged or disconnected.

  Further, when force repeatedly acts on the wiring material, peeling may occur at the interface between the covering material and the wiring material, and rainwater may enter the photovoltaic element.

  Further, when the wiring material is a member having a high mechanical strength having a thickness for the purpose of reducing electric resistance, when the parallel connection member or the DC-DC converter receives a force, a photovoltaic power is used instead of the wiring material. The element is deformed. Accordingly, when the photovoltaic element is plastically deformed, the reliability of the photovoltaic element is significantly lowered, which is not preferable. As a countermeasure for the above-mentioned problems, a reinforcing plate is disposed on the non-light-receiving surface side of the photovoltaic element, wiring material, and DC-DC converter, and the photovoltaic element, wiring material, and DC-DC converter are fixed to the reinforcing plate. However, the material cost of the reinforcing plate and the process of providing the reinforcing plate and fixing each member to the reinforcing plate are not preferable because they increase the cost of the AC module.

  Further, in the AC module shown in FIG. 2, the DC-DC converter is provided on the extended line of the gap 27 existing between the photovoltaic elements, and the flexibility between the photovoltaic elements is lost. When carrying an AC module during construction work, the DC-DC converter is heavy to some extent, so the AC module will bend, but if the flexible part between the photovoltaic elements is reduced, the photovoltaic element itself will be deformed. Will do. As a result, there is a case where an excessive force acts on the electrode portion having the weakest mechanical strength of the photovoltaic element, which is likely to cause a decrease in reliability. As a countermeasure for the above problem, as shown in FIG. 3, a configuration in which the DC-DC converter 32 is shifted from the extension line of the gap 37 existing between the photovoltaic elements is conceivable. This is not preferable because the wiring material 31 to be electrically connected becomes long and causes an increase in power loss.

  The present invention has been devised to solve the above-mentioned problems, and the DC-DC converter and the photovoltaic element are electrically connected without using a new reinforcing member or increasing the power loss. The purpose is to reduce the mechanical burden of the wiring material to be used and improve the reliability of the AC module.

  Means for solving the above problems will be described below.

  The AC module of the present invention has a plurality of series-connected bodies of photovoltaic elements composed of at least one photovoltaic element, and a DC-DC converter is electrically connected to each series-connected body via a wiring material. An inverter having an output cable is electrically connected to the DC-DC converter through a parallel connection member, and there is a deviation between two adjacent photovoltaic elements or series connection bodies. The DC-DC converter is disposed in the region where the photovoltaic element is not formed, and at least a part of the parallel connection member is fixed to the non-light-receiving surface side of the photovoltaic element.

  The photovoltaic device or the serial connection body is provided with a deviation, and at least part of the parallel connection member is fixed to the non-light-receiving surface side of the photovoltaic device, so that the worker can connect the parallel connection member during or after the construction. Even when a part of the parallel connection member is hooked, a force is not concentrated on the wiring member that electrically connects the photovoltaic element and the DC-DC converter because a part of the parallel connection member is supported by the photovoltaic element. Therefore, it is possible to prevent the wiring member from being damaged without newly providing a reinforcing plate or the like, and to prevent the reliability of the AC module from being lowered.

  In addition, if there is no DC-DC converter and inverter on the extended line of the gap existing between the photovoltaic elements, even if the AC module is bent, it bends at the gap existing between the photovoltaic elements and Since the power element itself does not bend greatly, it is possible to prevent troubles such as plastic deformation of the photovoltaic element.

  Furthermore, it is preferable that a plurality of series-connected bodies are integrated by a covering material and / or a tape member because a force applied to electrodes that electrically connect photovoltaic elements can be reduced.

  The method for producing an AC module of the present invention includes a step of forming a series connection body of photovoltaic elements composed of at least one photovoltaic element, a step of providing a wiring member on the series connection body, and a plurality of series connection bodies. , A step of arranging a DC-DC converter in a region where a photovoltaic element is absent and electrically connecting the wiring material, a step of electrically connecting the DC-DC converter and the inverter by a parallel connection member, and connecting an output cable to the inverter A step of providing, a step of fixing at least a part of the parallel connection member to the non-light-receiving surface side of the photovoltaic element, and a step of performing an insulation process on the region where the live part is exposed.

  In the step of forming a series connection body of the photovoltaic elements or the step of integrating a plurality of series connection bodies, it is desirable to form a gap between two adjacent photovoltaic elements or series connection bodies.

  In the present invention, the step of integrating the plurality of serially connected bodies is performed by any one of a single vacuum chamber type laminating apparatus, a double vacuum chamber type laminating apparatus, and a roll laminating apparatus, The process of applying insulation treatment to the area where the electrical parts are exposed is performed using either insulating tape or insulating resin, and the DC-DC converter, inverter, parallel connection member, and output cable are integrated in advance to convert power. It is desirable to form a unit and to electrically connect the power conversion unit to a wiring member provided in the series connection body.

  As described above, the present invention has a plurality of series-connected bodies of photovoltaic elements composed of at least one photovoltaic element, and a DC-DC converter is electrically connected to each series-connected body via a wiring material. In an AC module in which an inverter having an output cable is electrically connected to the DC-DC converter via a parallel connection member, the DC-DC converter is displaced between two adjacent photovoltaic elements or series connection bodies. At the time of construction by arranging a DC-DC converter in the photovoltaic element absence region formed by the deviation and fixing at least a part of the parallel connection member to the non-light-receiving surface side of the photovoltaic element. Or, when force is applied to the DC-DC converter and the parallel connection member after construction, it is possible to prevent the force from concentrating on the wiring material that electrically connects the DC-DC converter and the photovoltaic element, and the reliability of the AC module is improved. To prevent it from dropping Is possible.

  Hereinafter, preferred embodiments showing the AC module of the present invention and the manufacturing method thereof will be described in detail, but the present invention is not limited to the following embodiments.

  FIG. 4 shows a plan view of an AC module showing an example of the present invention as seen from the light receiving surface side.

  The AC module of this example has a plurality of serially connected bodies that are serially provided by shifting the photovoltaic elements 40, and the plurality of serially connected bodies are integrated by a tape-like member 46. An input terminal of a DC-DC converter 42 is electrically connected to both electrodes of each series connection body via a wiring material 41, and an output cable is connected to an output terminal of the DC-DC converter via a parallel connection member 43. An input terminal of an inverter 45 having 44 is electrically connected.

  Here, the DC-DC converter is arranged in a photovoltaic element absent region formed by a deviation of the photovoltaic elements, and electrically connects the output terminal of the DC-DC converter and the input terminal of the inverter. At least a part of the parallel connection member is fixed to the non-light-receiving surface side of the photovoltaic element.

  In the AC module of this example, the DC-DC converter and the inverter are arranged so as not to exist on the extended line of the gap existing between the photovoltaic elements.

  The method of manufacturing the AC module includes a step of connecting photovoltaic elements in series to form a series connection body, a step of providing wiring members on both electrodes of the series connection body, and a step of integrating a plurality of series connection bodies. , A DC-DC converter, an inverter, a parallel connection member, and an output cable are integrated to form a power conversion unit, and the power conversion units are arranged in series so that the DC-DC converter is disposed in the region where there is no photovoltaic element. There are a step of attaching to the wiring member provided in the connection body, a step of fixing at least a part of the parallel connection member to the non-light-receiving surface side of the photovoltaic element, and a step of performing an insulating process on the region where the live part is exposed.

  In this example, in the step of forming the series connection body, a shift is formed in the photovoltaic element.

(Series connection)
In the present invention, the series connection body means a structure body in which a single photovoltaic element or two or more photovoltaic elements are connected in series.

  The photovoltaic element constituting the series connection body of the present invention includes at least a photoelectric conversion layer, a transparent electrode layer, a back surface reflection layer, a back surface electrode layer, a current collecting electrode, and an extraction electrode. Below, the description regarding a photoelectric converting layer, a transparent electrode layer, a back surface reflection layer, a back surface electrode layer, a current collection electrode, and an extraction electrode is described.

  The photoelectric conversion layer has a function of converting light into electricity. Materials for this photoelectric conversion layer include group V elements such as Si, C and Ge, group IV element alloys such as SiGe and SiC, group III-V compounds such as GaAs, InSb, GaP, GaSb, InP and InAs, ZnSe, Examples include, but are not limited to, II-VI group compounds such as CdTe, ZnS, CdS, and CdSe, and I-III-VI group compounds such as CuInSe.

  The photoelectric conversion layer forms at least one set of pn junction, pin junction, heterojunction, or Schottky barrier. Moreover, as a suitable formation method of a photoelectric converting layer, various chemical vapor deposition methods, such as a microwave plasma CVD method, a VHF plasma CVD method, and RF plasma CVD method, are mentioned.

  The transparent electrode layer is an electrode on the light incident side that transmits light, and also serves as an antireflection film by optimizing the film thickness.

  The transparent electrode layer is required to have a high transmittance in the wavelength region that can be absorbed by the photoelectric conversion layer, and to have a low electric resistance. In2O3, SnO2, ITO (In2O3 + SnO2), ZnO, CdO, Cd2SnO4 Conductive oxides such as TiO2, Ta2O5, Bi2O3, MoO3, NaxWO3, or a mixture thereof are preferably used.

  As a method of forming the transparent electrode layer, a method of forming by sputtering with a sputtering gas containing a trace amount of oxygen is preferably used.

  The back surface reflection layer has a function as a light reflection layer that reflects light that could not be absorbed by the photoelectric conversion layer to the photoelectric conversion layer again.

  Examples of the material for the back reflective layer include metals such as Au, Ag, Cu, Al, Ni, Fe, Cr, Mo, W, Ti, Co, Ta, Nb, and Zr, and alloys such as stainless steel. Metals with high reflectivity such as Cu, Ag, Au are particularly preferred.

  The back electrode layer functions as a current collecting electrode that collects charges generated on the non-light-receiving surface side of the photoelectric conversion layer. Specific materials include, but are not limited to, metals such as Al, Au, Ag, Cu, Ti, Ta, and W. As a method for forming the back electrode layer, a chemical vapor deposition method, a sputtering method, or the like is preferably used. Further, as the back electrode layer, a conductive substrate having a function as a support substrate for supporting each layer so as not to be damaged by an externally applied force is suitably used. Specific materials for the conductive substrate include thin films of metals such as Fe, Ni, Cr, Al, Mo, Au, Nb, Ta, V, Ti, Pt, and Pb, or alloys thereof, and composites thereof. Is not limited to this.

(electrode)
The electrode has a function of extracting charges generated on the light receiving surface side and the non-light receiving surface side of the photoelectric conversion layer of the photovoltaic element. This electrode is electrically connected to the light receiving surface of the transparent electrode layer and the non-light receiving surface of the back electrode layer of the photovoltaic element. Examples of the connection method include silver paste, conductive tape, spot welding, and solder.

  A foil body is preferably used as the current collecting electrode, and specific materials include copper foil, tin-plated copper foil, silver-plated copper foil, nickel-plated copper foil, and the like. The copper foil is preferably made of oxygen-free copper, tough pitch copper, or phosphorous deoxidized copper, and has a thickness of 0.1 mm to 0.3 mm.

(Wiring material)
The wiring member is a member provided to input DC power generated by the series connection body to the DC-DC converter, and is electrically connected to the electrode of the series connection body and the input terminal of the DC-DC converter. As the connection method, silver paste, solder, spot welding, bolts / nuts, screws and the like are preferably used. In addition, as a specific material of the wiring material, an electric wire or cable wire whose surface is coated with polyvinyl chloride, polyvinylidene chloride, or the like, or a copper foil that is not insulation-coated, a tin plated copper foil, a silver plated copper foil, Although nickel plating copper foil etc. are mentioned, it is not limited to this.

(DC-DC converter)
The DC-DC converter plays a role of converting DC power generated by the series connection body into DC power matching the input voltage of the inverter. DC-DC converter, booster circuit that boosts DC power to DC power of different voltage, start-up / stop of DC-DC converter, optimization of photovoltaic element operating point, control circuit for controlling operation mode, input / output It consists of terminals.

  As the booster circuit, various known and publicly available circuit configurations can be used regardless of insulation or non-insulation. The control circuit includes a CPU, a PWM waveform control circuit, an optimum operating point tracking control circuit, a control power supply generation circuit, a frequency / voltage reference generator, a switching control circuit, and the like. In addition, the control circuit may be operable from the outside via a communication line or the like, and a part of the function of the control circuit is arranged outside the DC-DC converter to collectively control a plurality of DC-DC converters. You can also.

  In order to simplify the structure of the DC-DC converter as much as possible and reduce costs and improve reliability, the control circuit includes a control power supply generation circuit, a switching reference waveform generation circuit that defines the switching frequency, and a switching element that is driven with a fixed duty. A configuration having at least a possible switching element driving circuit is preferable. The main circuit preferably includes a switching element that is turned ON / OFF by the switching element driving circuit and a switching transformer that is created with a predetermined turn ratio.

  In such a system in which a plurality of DC-DC converters controlled at a fixed duty are connected in parallel, the input voltage of the DC-DC converter can be changed by changing the input voltage of the subsequent power converter. Thus, the operating point of the photovoltaic element can be controlled to be the optimum operating point.

(Inverter)
The inverter is an inverter circuit that converts DC power to AC power, as well as control circuit that controls start / stop of power conversion, optimization of the operating point of the solar cell, operation mode, system linkage protection circuit, communication circuit, input circuit, etc. It is composed of output terminals and the like, and the output is used in a load or linked to the system.

  As the inverter circuit, a voltage type inverter using IGBT or MOSFET as a switching element is preferable. By driving the gate of the switching element by the control signal of the control circuit, AC power having a desired frequency, phase and voltage can be obtained.

  The control circuit includes a CPU, a PWM waveform control circuit, an optimum operating point tracking control circuit, a control power supply generation circuit, a frequency / voltage reference generator, a switching control circuit, and the like. In addition, when the inverter is connected to each of the plurality of photovoltaic elements, the control circuit may be operable from the outside via a communication line or the like, and the control circuit itself is disposed outside the inverter, Can be collectively controlled.

(Parallel connection member)
The parallel connection member is a member for electrically connecting the output terminal of the DC-DC converter and the input terminal of the inverter.

  Specific materials for the parallel connection member include, but are not limited to, electric wires or cable wires whose surfaces are coated with polyvinyl chloride, polyvinylidene chloride, and the like.

(Photovoltaic element absence area)
In the present invention, the photovoltaic element absent region means a hatched region 51 formed by disposing the two photovoltaic elements 50 or the serial connection body so as to be displaced. (See Figure 5)

  FIG. 6 is a plan view of the AC module of this embodiment viewed from the light-receiving surface side and the non-light-receiving surface side, and FIG. 7 is a plan view and a cross-sectional view of the photovoltaic element constituting the AC module.

  The AC module of this example includes a photovoltaic element 60, a DC-DC converter 61 that boosts DC power generated by the photovoltaic element to an input voltage of the inverter, an inverter 62 that converts the boosted DC power into AC power, Covering material 63 for sealing the photovoltaic element, wiring material 64 for electrically connecting the photovoltaic element and the DC-DC converter, a parallel connection member 65 for electrically connecting the DC-DC converter and the inverter, AC power to the outside The output cable 66 is taken out.

  The photovoltaic element has a layer structure of a resin layer 70, a transparent electrode layer 71, a photoelectric conversion layer 72, a back surface reflection layer 73, and a back surface electrode layer 74 from the light receiving surface side, and the resin layer is an acrylic urethane resin. The transparent electrode layer is composed of ITO, the photoelectric conversion layer is composed of PIN type amorphous silicon, the back surface reflecting layer is composed of ZnO and Al, and the back surface electrode layer is composed of stainless steel. A positive electrode 75 made of silver-plated copper foil is provided on the light receiving surface of the transparent electrode layer, and a negative electrode 76 made of copper foil is provided on the non-light receiving surface of the back electrode layer.

  The AC module of this example has four series-connected bodies formed by connecting the two photovoltaic elements in series with an interval of 5 mm. A deviation of 50 mm is formed between the two photovoltaic elements constituting the series connection body.

  On the light receiving surface side of the photovoltaic element, an ETFE / EVA film made of tetrafluoroethylene-ethylene copolymer (ETFE) and ethylene-vinyl acetate copolymer (EVA), on the non-light receiving surface side, EVA / PET / EVA films made of ethylene-vinyl acetate copolymer (EVA) and polyethylene terephthalate (PET) are provided, respectively, and 4 series-connected bodies are provided with a spacing of 5 mm by the coating material composed of the film. Are sealed.

  A wiring material made of nickel-plated copper foil is electrically connected to the positive electrode and the negative electrode of each series connection body, and as shown in FIG. 6, the wiring material 64 protrudes from the end of the covering material. The input terminal of the DC-DC converter is electrically connected to the protruding portion of the wiring material, and the output terminal of each DC-DC converter and the input terminal of the inverter are electrically connected by a parallel connection member composed of 2sq IV lines. Yes. The DC-DC converter is arranged in the photovoltaic element absent region formed by arranging the photovoltaic elements with a deviation, and exists on the extended line of the gap existing between the photovoltaic elements. do not do.

  In the region where the parallel connection member is located on the non-light-receiving surface side of the photovoltaic element, the parallel connection line and the photovoltaic element are fixed by the polyimide film tape 67.

  A plan view of the AC module of this example viewed from the light receiving surface side is shown in FIG. Note that points not specifically mentioned here are the same as those in the first embodiment.

  The AC module of this example has ten photovoltaic elements 80 in which the light receiving surface and the non-light receiving surface are coated with a fluororesin. A wiring material 81 is provided on the positive electrode and the negative electrode of each photovoltaic device, and a DC-DC converter 82 is electrically connected to the previous wiring material.

  The DC-DC converter is arranged in a photovoltaic element absent region formed by adjacent photovoltaic elements, and the photovoltaic element in which the DC-DC converter is arranged on the upper end side and the lower part on the short side The photovoltaic elements in which the DC-DC converters are arranged are alternately arranged.

  Each DC-DC converter is electrically connected to the inverter 84 via a parallel connection member 83. In the region where the parallel connection member is located on the non-light-receiving surface side of the photovoltaic element, the parallel connection member is a photovoltaic device. A polyimide film tape 85 is fixed to the non-light-receiving surface of the element.

  The photovoltaic elements are fixed at two locations by adjacent photovoltaic elements and polyimide film tape 86. Here, the gap between the photovoltaic elements is 5 mm, and the deviation from the adjacent photovoltaic elements is 50 mm.

  A method for manufacturing the AC module of this example will be described below. Note that the points not specifically mentioned here are the same as those in the first and second embodiments.

  In this example, an operation for forming a series connection body is performed first. The work of forming the series connection body is to arrange two photovoltaic elements so as to form a gap, and one end of the L-shaped copper foil extending the electrode to the positive electrode of one photovoltaic element, The other end is electrically connected to the negative electrode of the other photovoltaic element using solder. After forming the series connection body, an operation of electrically connecting a wiring material made of a copper foil having a thickness of 100 μm to the positive electrode and the negative electrode of the series connection body is performed.

  Simultaneously with the operation of forming the series connection body, the operation of forming a power conversion unit by integrating the DC-DC converter, the inverter, the parallel connection member, and the output cable is also performed. The operation of forming the power conversion unit is to form a parallel connection member by providing crimp sleeves having Y-type terminals at both ends of the 2sq IV line, and the Y-type terminals are output terminals of the DC-DC converter and input terminals of the inverter. A cable sleeve coated with polyvinyl chloride and a crimp sleeve having a Y-shaped terminal at one end of the cable wire covered with polyvinyl chloride, and a waterproof connector at the other end to form an output cable. The work consists of fixing to the output terminal of the inverter with screws.

  The series connection body provided with the wiring material is integrated using a single vacuum laminating apparatus. Lamination method is EVA (230μm) / PET (100μm) / EVA (230μm) film on laminating device, 4 series connection body (light receiving surface upward) on EVA / PET / EVA film, light reception of series connection body An ETFE (50μm) / EVA (460μm) film is placed on the surface, exhausted at a pumping speed of 104 (Pa / sec) and a vacuum of 670 (Pa) for 30 minutes, and then a laminating device is put into a hot air oven at 160 ° C. Heat in a vacuum for 50 minutes. Thereafter, the laminating apparatus is taken out from the hot air oven and cooled at room temperature to complete the sealing.

  After integrating the series connection body, the input terminal of the DC-DC converter provided in the power conversion unit and the wiring material provided in the series connection body are electrically connected with solder and in parallel using a polyimide film tape. The connecting member is fixed to the non-light-receiving surface of the photovoltaic element.

  Finally, an epoxy resin is potted on the electrical connection part where the live part is exposed to seal all live parts.

  FIG. 9 shows a perspective view and a cross-sectional view of the solar power generation system of this example. Note that the points not specifically mentioned here are the same as those in the first to third embodiments.

  The photovoltaic power generation system of this example includes a plurality of AC modules 90 and a gantry 91 for installing the AC modules.

  The gantry is formed by placing the inclined block 91a on the support block 91b with one end side in contact with the ground as a branch. The inclined block and the support block are made of hollow concrete blocks having a height of 100 mm, a width of 190 mm and a length of 390 mm.

  As shown in FIG. 9, a shielding block 94 is installed at the end of each row of the gantry. The shielding block plays a role of preventing the wind from entering the space 95 formed by the inclined block and the support block when the wind is strong and the block rising.

  Each AC module is tightly fixed to the concrete block with an epoxy-based elastic adhesive.

  A commercial power system 93 is arranged between the columns of the gantry, and an output cable 92 provided in the inverter 96 of each AC module is electrically connected.

It is a figure which shows the conventional solar power generation system. It is a top view which shows the conventional AC module. It is a top view of the AC module which shows an example of the problem which should be solved. It is a top view of the AC module which shows an embodiment. It is a top view explaining a photovoltaic element absent region. 1 is a plan view of an AC module showing Example 1. FIG. It is the top view and sectional drawing of a photovoltaic device which show Example 1. 6 is a plan view of an AC module showing Embodiment 2. FIG. It is a perspective view of the solar energy power generation system which shows Example 4. FIG.

Explanation of symbols

10 Solar cell module
11 Solar cell module array
12 Current collection box
13 Power converter
14, 93 Commercial power system
20, 30, 40, 50, 60, 80 Photovoltaic elements
21, 31, 41, 64, 81 Wiring material
22, 32, 42, 61, 82 DC-DC converter
23, 33, 43, 65, 83 Parallel connection member
24, 34, 44, 66, 92 Output cable
25, 35, 63 Covered goods
26, 36, 45, 62, 84, 96 Inverter
27, 37, 47 gap
46, 67, 85, 86 Tape material
51 Photovoltaic element absence area
70 Resin layer
71 Transparent electrode layer
72 Photoelectric conversion layer
73 Back reflective layer
74 Back electrode layer
75, 76 electrodes
90 AC module
91 frame
94 Shield block
95 space

Claims (11)

  There are a plurality of series-connected bodies of photovoltaic elements composed of at least one photovoltaic element, a DC-DC converter is electrically connected to each series-connected body via a wiring material, and the DC -In an AC module in which an inverter having an output cable is electrically connected to a DC converter via a parallel connection member, there is a deviation between two adjacent photovoltaic elements or series connection bodies, and the deviation is formed. An AC module, wherein a DC-DC converter is arranged in a region where there is no photovoltaic element, and at least a part of the parallel connection member is fixed to the non-light-receiving surface side of the photovoltaic element.   2. The AC module according to claim 1, wherein a DC-DC converter and an inverter are not present on an extended line of a gap existing between photovoltaic elements.   The AC module according to claim 1, wherein the plurality of serially connected bodies are integrated with a covering material.   The AC module according to claim 1, wherein the plurality of serially connected bodies are integrated by a tape member.   A step of forming a series connection body of photovoltaic elements having at least one photovoltaic element, a step of providing a wiring material on the series connection body, a step of integrating a plurality of series connection bodies, a DC-DC converter Is disposed in the photovoltaic element absent region and electrically connected to the wiring material, the DC-DC converter and the inverter are electrically connected by a parallel connection member, the output cable is provided to the inverter, and at least a part of the parallel connection member A method for manufacturing an AC module, comprising: a step of fixing the photovoltaic element to the non-light-receiving surface side of the photovoltaic element; and a step of performing an insulation treatment on a region where the live part is exposed.   6. The AC module according to claim 5, wherein in the step of forming the series connection body with at least two photovoltaic elements, a deviation is provided in some of the photovoltaic elements constituting the series connection body. Production method.   6. The method of manufacturing an AC module according to claim 5, wherein, in the step of integrating a plurality of series-connected bodies, a deviation is provided in some series-connected bodies constituting the AC module.   6. The AC according to claim 5, wherein any one of a single vacuum chamber type laminating apparatus, a double vacuum chamber type laminating apparatus, and a roll laminating apparatus is used in the step of integrating a plurality of series-connected bodies. Module manufacturing method.   6. The method of manufacturing an AC module according to claim 5, wherein the insulating treatment is performed on the region where the live part is exposed using either an insulating tape or an insulating resin.   A DC-DC converter, an inverter, a parallel connection member, and an output cable are integrated in advance to form a power conversion unit, and the power conversion unit is electrically connected to a wiring member provided in a series connection body. Item 6. A method for manufacturing an AC module according to Item 5.   The solar power generation system using the AC module of any one of Claims 1 thru | or 4.

Images