WO2010122011A2

WO2010122011A2 - Solar installation

Info

Publication number: WO2010122011A2
Application number: PCT/EP2010/055175
Authority: WO
Inventors: Karl-Heinz Krampe
Original assignee: Sunsail Energy Gmbh & Co. Kg
Priority date: 2009-04-20
Filing date: 2010-04-20
Publication date: 2010-10-28
Also published as: WO2010122011A3

Abstract

The invention relates to a solar installation especially designed as a photovoltaic installation (1) with a plurality of adjacent energy converter arrangements (2) respectively comprising a holding element (4), an energy converter (6), and an optical device (8) by which means a beam path can be directed towards the energy converter (6). The photovoltaic installation (1) displays an asymmetrical arrangement of the optical device (8) in relation to the energy converter (6), the optical device (8) of the energy converter arrangement (2) being directed towards the energy converter (6) of an adjacent energy converter arrangement (2).

Description

solar system

The invention relates to a solar system in the embodiment of a Photovoltaikan- location according to the preamble of patent claim 1.

Solar technology is the direct conversion of radiant energy of the sun (or solar energy) into usable forms of energy. Here, the spectrum of solar technology is divided into different subareas, which is distinguished by whether from the solar radiation heat or electrical energy is obtained.

With the help of solar collectors in a solar system, a heat transfer medium such. For example, water is heated by the solar energy and provided to the user in the form of hot water or supplied to an energy conversion to usable power. In contrast, in a photovoltaic system, the radiation energy of the sun is converted directly via the solar cells into electrical energy, which is available to the user as solar power.

Decisive for the economic operation of such a system are, in addition to the location, other factors, such as the size of the sun-impacted surface and the quality of the orientation of the applied surface in the direction of the sun.

In order to make the size of the sun-irradiated surface more efficient, various solar systems have been developed in recent years, which focus more sunlight applied to a photovoltaic element. An optical device, such as a radiation-concentrating Fresnel lens, which is substantially wider than the photovoltaic element, is thereby brought in front of the photovoltaic element, so that it is acted upon by a higher beam concentration. As a result, this solar system compared to plants that are exposed only to direct sunlight due to the better use of the size of the sunbeamed area capture a much larger amount of sunlight, generate more energy and despite lower size of the photovoltaic elements provide the same yield of energy a comparable system in which the energy converter arrangement has the size of the optical unit.

Such a solar system is shown, for example, in DE 20 2007 016 715 U1, in which Fresnel lenses focus the radiation incident from the sun onto a focal line. This very high-energy focal line is able to heat a liquid that runs in a tube, or to act on a photovoltaic cell, so that an energy conversion into usable energy takes place. In this case, the Fresnel lens proves to be a particularly efficient way to focus the incident sunbeams on a common point or a common focal line, since each individual prism can be customized and the Fresnel lens compared to a conventional lens both volume and weight saves what can be used for a simplified tracking.

In order to make the alignment of the applied surface in the direction of the sun more efficient, various solar systems have been developed in recent years, in addition to the systems rigidly connected to the ground, which continuously adapt to the position of the sun. The relevant prior art shows, for example, concentrator solar systems which, in order to save expensive area costs of solar modules, concentrate the incident sunlight into a small area through an upstream optical system. In order to always ensure optimum efficiency of the system, the solar system is tracked to the position of the sun in such a way that the best possible efficiency is constantly ensured at the focal point.

In summary, in addition to the direct radiation, the photovoltaic element of a non-focusing photovoltaic system also encounters additional diffuse radiation. These systems do not have to be tracked or come with low Nachführpräzision, which is why the Aufständerungskosten are minimized. In order to obtain a given nominal power of the system, a larger surface of photovoltaic elements is needed in comparison to focusing systems, which means a high expenditure on expensive solar modules. In comparison, a focusing photovoltaic system requires less solar module area, as more radiation falls on a smaller photovoltaic element, which increases the efficiency of the plant. The disadvantages of the focusing system are a limited use of diffuse radiation, additional expensive cooling and a complex tracking system with usually high Nachführpräzision.

In the meantime, it has already been proposed to apply the photovoltaic cell of a photovoltaic system with both direct and indirect radiation. However, the disadvantage of such systems is always the shading of the photovoltaic cell by the holding elements or the so-called Aufständersteile. Since the angle of incidence in which the earth is irradiated by sunlight changes strongly over the course of the year, especially in spring or autumn, the upstand parts of a photovoltaic system, which is aligned with the angle of incidence in summer, obscure the already poor efficiency of the system at this time of year.

It is therefore an object of the invention to minimize the above-mentioned disadvantages and to provide a solar system of the type mentioned, whose photovoltaic element is more economical to operate compared to the prior art.

According to the invention the object is achieved by the features of the independent claim. Further advantageous embodiments of the invention are described in the subclaims. In this case, a photovoltaic system with a plurality of juxtaposed energy converter arrangements is proposed in each case a holding element, an energy converter and an optical device. This bends with the above in the beam path optical device, the radiation to the energy converter. By an asymmetrical arrangement of the optical device to the energy converter, a particularly effective construction of the photovoltaic system is possible because the direct radiation from a radiation source or a radiation transmitter through the optical device is additionally directed to the adjacent energy converter arrangement and direct radiation from the radiation source or the radiation transmitter hits the energy converter directly. This total loading of the energy converter with direct radiation and additional indirect radiation increases the overall efficiency of the photovoltaic system, since no optical device is arranged in the beam path over the energy converter. Transmission losses as well as shading by a closer to the radiation source optical devices are prevented.

By an advantageous attachment of the retaining element outside the beam path between the optical device of the energy converter arrangement and the applied energy converter of an adjacent energy converter arrangement, it is possible to make the beam path between the optical device and energy converter free of holding or supporting elements. The resulting less shading of the energy converter leads to a more efficient utilization of the existing solar radiation, since all the rays land on the energy converter and no radiation is lost to holding parts.

In a preferred application example, the holding element is formed from an optical receptacle, an energy converter receptacle and a web section. In this case, the optical pickup is arranged opposite the energy converter receptacle on the opposite side of the web section, the energy converter receptacle carrying the energy converter and the optical pickup spacing the optical device to the energy converter of the adjacent energy converter arrangement. A particularly good optical recording and / or energy converter recording is formed by a substantially U-shaped receptacle, which carries and fixes the optical device or the energy converter. Alternatively, this recording can also be done by a clamping profile or other known elements of the fastening technique.

If the optical receptacle and / or the energy converter receptacle is designed so that the engaging edge of the optical device and / or the energy converter releasably and positively engages the holding element, secure mounting at a later date than the mounting of the elevation and substructure is possible. In addition, a subsequent disassembly for cleaning, maintenance or replacement of the individual elements is possible.

A particularly simple production of the holding elements provides the cross-section - consisting of the sections of the optical receptacle, the web section and the energy giewandleraufπahme - build up substantially S-shaped, wherein the holding element extends perpendicular to its cross-sectional area in a linear direction. This basic structure of the holding element allows the use of rollform or extruded parts which can be made particularly cheap and easy.

If the holding element has a base section for attachment to a substructure, then the components of the energy converter arrangement can be attached to the substructure in a particularly simple manner, without having to attach further fastening sections to the holding element. If there is an additional elastic element between the base section and the retaining element, which can absorb vibrations, vibrations and torsion between the retaining element and substructure, a particularly rigid arrangement of the energy converter arrangement is possible, whereby the beam path remains constant even under external influences such as wind and not by torsion occurring the components to each other a tolerance in the beam path leads to a poorer action on the energy converter.

A further embodiment provides that optical devices and energy converters are received and supported on the back by a holding element such that no optical losses due to holding sections protruding into the beam path lead to a deterioration of the efficiency.

According to a variant of the photovoltaic system, the energy converter arrangements extend between two mutually parallel spaced retaining cheeks, which constitute holding elements. By such an attachment of the energy converter arrangement, the shadow-intensive optical recordings and energy converter recordings of the previous embodiment can be dispensed with, since the elements are taken on the front side. Advantageously, supporting elements are attached to the cheeks on which the optical device and the energy converter arrangement can be fixed and, if necessary, can be dismantled again.

In order to counteract deflection of the energy converter arrangement in the case of wider installations, additional holding elements can be provided in the variant with retaining cheeks. see optical device and energy converters are mounted to catch the dead weight of the components.

As an alternative to a rigid connection of the optical device and the energy converter to the retaining cheeks, it is possible to have the device consisting of optical device, energy converter arrangement and support element rotatably engage in the retaining cheeks by means of a bolt.

A particularly high degree of efficiency of the photovoltaic system is achieved if the surface of the holding element facing the energy converter is mirrored or carries an additionally applied reflective element. Due to the reflection of the reflecting surface, the direct radiation from a radiation source or a radiation transmitter striking the holding element is additionally directed to the energy converter which is associated with the holding element. An angle of incidence of the holding element to the vertical between 15 and 45 °, measured in an O ° position of the energy converter arrangement, has proved to be particularly favorable with respect to the installation height and the energy efficiency of the photovoltaic system. The efficiency of the system can be further increased if the angle of attack between 25 and 30 °, especially if the angle of attack is 28 °.

By attaching additional supports that engage the support member and lead to the substructure, the energy converter assembly is particularly stable, which accommodates the beam accuracy, and also more resistant to external influences such. B. wind loads.

The efficiency of the photovoltaic system can be further increased if the holding element heat dissipating properties, such. B. from a material with good thermal conductivity and / or heat dissipating elements such. B. cooling fins to increase the surface has. The resulting heat energy due to incident solar radiation on the energy converter can flow through these measures to the environment. This results in a temperature-dependent increase in the efficiency of the energy converter during cooling. Advantageously, the optical device of the photovoltaic system is designed as an optical beam deflection device. The incident on the optical device sun rays are thus diffracted by the optical beam deflection device to the associated energy converter. In this case, the optics of the beam deflection device can be designed so that the beams are deflected, scattered or focused.

In order to protect the beam deflecting device of the optical device sufficiently, it is protected against environmental influences, in particular when using a Fresnel lens structure with a glass surface or similar substance or a surface coating. Through the glass surface, which is mounted above and / or below the beam deflection device, the beam deflection device is protected against dirt, scratching or UV radiation. Preferably, the surfaces are sealed to each other, so that neither between the glass nor between the plastic glass plane impurities can occur. In order to reduce the reflection losses on the otherwise reflecting surface of the beam deflection device, non-reflective glass and / or non-reflective plastic is advantageously used for the optical device. A particularly efficient construction of the energy converter arrangement is achieved if the deflection angle, measured from a nearly vertical beam path of a radiation source or a radiation transmitter, is diffracted onto the optical device between 20 ° and 60 °. This diffraction angle defines the position of the optical device to the energy converter.

A further variant of the photovoltaic system provides for dividing the optical device, so that a plurality of beam deflection devices consisting of sections with different diffraction angles arise. By means of this subdivision and the resulting different diffraction angle, on the one hand, the movement of the sun over the course of the day as well as an individual beam deflection matched to an intrinsic energy converter can be adapted. For example, the optical device and / or the holding device may have a polygonal or arcuate cross-section, preferably convexly aligned with the radiation source. By attaching regular reinforcements, the optical device can be supported. The resulting increased torsional stiffness allows a more accurate beam guidance of the optical device to the energy converter, as by wind or Nachführbewegungen, but also by its own weight or material wear, such. B. deflection or tolerances due to thermal expansion, resulting inaccuracies can be intercepted th inter alia by the running example as a steel wire reinforcement and prevented. The reinforcement used at periodic intervals preferably acts on the retaining element.

The attached at the foot of the holding element energy converter of energy converter assembly for converting solar energy into usable forms of energy such as preferably electrical or thermal energy in a preferred embodiment consists of a solar cell, which is designed for two to 20-fold concentrations, in particular two to sixfold concentrations , These solar cells for low-focussing systems are uncomplicated and inexpensive to produce compared to highly focussing solar cells. A high conversion efficiency results when using cells based on crystalline silicon or amorphous silicon and when using copper indium or cadmium telluride modules. Higher efficiencies can also be achieved, for example, by means of a tandem or triple cell.

Advantageously, the energy converter arrangements of a photovoltaic system are mounted in series next to one another and preferably parallel on a substructure. By attaching the energy converter arrangement on a substructure, it is ensured that no further parts belonging to the photovoltaic system are located between the energy converter arrangement and the radiation source and thus cast no shadow over the energy converter arrangement or are arranged in the beam path between optical device and energy converter.

A particularly good substructure is created by the use of cross members, which are arranged side by side, preferably at right angles to the extent of the energy converter arrangement. Through the use of these cross beams, the energy converter assemblies are fixed to each other and stabilized. By the use of Hollow profiles as a cross member can be a particularly lightweight substructure, which in turn is easier to assemble and handle to be created.

To track the energy converter arrangement according to the current position of the sun, which changes during the day, the photovoltaic system is tracked by means of a tracking device to the position of the sun. This tracking allows depending on the position of the sun maximum efficiency of the energy converter, which are always acted upon by the tracking with a maximum of solar radiation. For this purpose, the photovoltaic system has both a sun position meter and a drive which transmits the tracking movement to the tracking device, wherein the cross members rocker-like tracked in a common pivot point, the position of the sun.

In a further embodiment of the photovoltaic system, the energy converter arrangements fastened to the substructure are tracked to the position of the sun via a cable arrangement which is arranged side by side, preferably in the Jawerth cable tie principle, wherein the cables transmit the tracking movement to the cross members.

A development of the photovoltaic system provides to attach a wind deflector at the lower end of the holding element in continuation of the energy converter. By continuing the cross-sectional area with a wind deflector, winds acting on the photovoltaic system can be guided particularly effectively by the series-mounted energy converter arrangements, which leads to a lower wind susceptibility of the system, longer service life and lower failures.

A particularly high utilization of the solar radiation impinging on the energy converter arrangement is achieved if the optical device is arranged in a 0 ° position of the energy converter arrangement in the manner above the energy converter, that an edge of the optical device, which faces the adjacent energy converter arrangement, substantially is congruent with the edge of the energy converter of a longitudinally adjacent energy converter arrangement. By this substantially congruent with each other arranged parallel edges of the individual energy converter arrangements to each other ensures that all hit the photovoltaic system sun rays either through the optical device, the mirrored holding element or directly to the energy converter to produce energy.

Below, the photovoltaic system according to the invention is explained in more detail with reference to several examples shown in the drawing. In the drawing show:

1 is an overall perspective view of a photovoltaic system with a plurality of juxtaposed energy converter arrangements;

2 shows a cross section of a photovoltaic system with an energy converter arrangement according to a first embodiment;

3 shows a cross section of the photovoltaic system with an energy converter arrangement according to a second embodiment;

4 shows a cross section of the photovoltaic system with an energy converter arrangement according to a third embodiment;

5 shows a cross section of the photovoltaic system with an energy converter arrangement according to a fourth embodiment;

6 shows a cross section of the photovoltaic system with an energy converter arrangement according to a fifth embodiment;

7 shows a variant of the photovoltaic system with a plurality of juxtaposed energy converter arrangements; and

8 and 9 representations of a variant of the first optical device

In the following, six embodiments of the photovoltaic system according to the invention with an energy converter arrangement will be described. The generally valid Construction of the photovoltaic system, consisting of an energy converter arrangement, each with a holding element, an energy converter and an optical device, which are mounted on a substructure will be described with reference to a first embodiment. Beyond that features and advantageous developments of the invention will be described in the other embodiments, being dispensed with further explanations to already known from the first embodiment features.

The illustrated in Fig. 1 perspective view of a photovoltaic system 1 according to the invention shows a plurality of juxtaposed energy converter assemblies 2, which is composed of the essential components of a holding element 4, an energy converter 6 and an optical device 8. The parallel to each other in series mounted energy converter assemblies 2 are mounted on a substructure 10 of a grid of cross members 12. The substructure 10 forms together with the frame 14, the elevation, wherein the mounted energy converter assemblies are tracked on the substructure 10 by means of a tracking 16 the sun. For attachment, the photovoltaic system can be fixed on a foundation 18.

FIG. 2 shows a first exemplary embodiment of the energy converter arrangements 2, which, viewed in cross-section, are mounted side by side on a substructure 10 consisting of cross members 12. The energy converter assemblies 2, consisting of the holding element 4, the energy converter 6 and the optical device 8, are arranged by the holding element 4 in such a way that the optical device 8 is facing away from the opposite side of the holding element and thus the energy converter, and the is spaced from the energy converter in such a way that the optical device 8 is vertically closer to the sun, compared to the energy converter 6 of the same energy converter arrangement 2, by this asymmetric structure of the energy conversion arrangement 2, the optical device 8 on the opposite side of the holding element 4 carries with respect to the energy converter 6, the following beam path is made possible. A direct radiation emitted by a radiation source or a radiation transmitter, for example the sun, from essentially parallel individual beams which are incident on the optical device. 8 meet are diffracted by the optical device 8 such that the rays hit the energy converter 6 of an adjacent energy converter assembly 2. For this purpose, the optical device 8 consists of an optical beam deflection device. This prismatic Fresnel lens structure allows for deflection, scattering or focusing of the beams onto the energy converter 6,

The energy converter 6 of the energy converter arrangement 2 consists of a photovoltaic element for generating electrical energy. Alternatively, the energy converter 6 may also consist of a transducer, the energy applied in a further form of energy such. B. hot water transferred.

The holding element 4 fulfills a multiplicity of functions. At an upper end of the holding element 4, an optical receptacle 22 is mounted, which receives the optical device 8 at its edge region. In this first embodiment shown, the optical receptacle 22 consists of the holding element 4, which is continued in a cranked manner. For fixing the optical device 8, an additional clamping element 24 is attached to the energy converter arrangement 2 in such a way that the optical device 8 is clamped between the cranked end of the holding element 4 and the clamping element 24. In order to keep the shading low, the optical recording is carried out as small as possible.

At the optical receptacle 22, a web portion 26 of the retaining element 4 connects. This web section 26 spaces the optical receptacle 22 and the optical device 8 attached thereto to the energy converter 6 and to the substructure 10. The length of the web section 26 is adapted to the total size of the energy converter arrangement 2 and the diffraction angle B of the optical device 8. In the further course of the holding element 4 joins the bridge section 26 an energy converter receptacle 28 at. The energy converter receptacle 28 fixes on the one hand the energy converter 6 in the energy converter arrangement 2, in this embodiment forms the connection to the substructure 10 and moreover enables a heat removal of the energy converter 6. This dissipated heat is created by the action of the energy converter 6 with solar energy. In general, a higher efficiency of the photovoltaic system 1 is generated when the energy converter 6 is a self-homogeneous and As low as possible temperature difference to the environment has. In order to allow the heat of the energy converter 6 to flow to the environment in the best possible way, the energy converter receptacle 28 is made of a material which is particularly thermally conductive and, as shown in FIG. 2, lies against the energy converter 6 over the largest possible area. The energy converter receptacle 28 has lateral clamping areas which serve to receive and fix the energy converter 6.

The optical receptacle 22 and the energy converter receptacle 28 are designed so that an assembly of the optical device 8 and the energy converter 6 in place is possible after the retaining element 4 has been mounted on the substructure, thus damage to the sensitive parts during assembly of the elevation avoid.

In this exemplary embodiment, a wind guiding element 30 adjoins the energy converter receptacle 28 of the holding element 4. This Windleitelement 30, consisting of a continuous sheet metal section, the contour of the substantially Z-shaped cross-section of the energy converter assembly 2 continues to lead to the wind acting on the system resistance through the gaps between the individual energy converter assemblies 2. As a result, the photovoltaic system 1 receives less susceptibility to wind, which can be further reduced by the system is pivoted controlled by a wind sensor at an optimum angle to the wind direction. This function of the photovoltaic system 1 leads to a longer operating time and thus to a higher efficiency of the photovoltaic system 1, since the system can produce energy longer in its optimum operating state without being taken out of the wind in order to avoid defects.

The energy converter assemblies 2 mounted next to one another on a cross member 12 are pivoted about a common pivot point D by means of a tracking device 16 in order to generate the highest possible efficiency of the energy converter arrangement 2 depending on the position of the sun.

Fig. 3 shows a second embodiment of the energy converter assemblies 2, which are seen in cross-section mounted side by side on a substructure. The energy converter arrangements 2, comprising the holding element 4, the energy converter 6 and the optical device 8, has an additional base section 32, which represents the extension of the web section 26. A more variable connection of the energy converter arrangement 2 to the substructure 10 is possible via this base section 32. By this change, it is also possible to make the energy converter receptacle 28 shorter and thus more material-saving. In this embodiment, both the optical receptacle 22 and the energy converter receptacle 28 is formed as a U-shaped receptacle. In this case, the clear width of the U-shaped legs substantially corresponds to the strength of the optical device or the energy converter 6. For sufficient support of the energy converter 6, the lower leg of the energy converter receptacle is longer designed to provide sufficient support.

As can be seen in FIG. 3, in addition to the radiation which is diffracted by means of the optical device onto the adjacent energy converter 6, additional radiation comes directly from the radiation source or the radiation transmitter onto the energy converter 6 Energy converter 6 incident rays to the amount of radiation, which additionally hits directly on the energy converter 6. Thus, the total application of the energy converter is composed of indirect radiation and direct radiation.

FIG. 4 shows a third exemplary embodiment of the energy converter arrangements 2, which, viewed in cross section, are mounted side by side on a substructure 10. The energy converter arrangements 2, comprising a holding element 4, the energy converter 6 and the optical device 8, are mounted on the substructure 10 by means of the base section 32. In this embodiment, the base portion 32 carries both the energy converter 6, which is reinforced by glass surfaces, as well as the web portion 26 which is inclined in this embodiment by 22 ° from the vertical and at the end of the optical pickup 22 is located, which is a particular to allow easy manufacture and attachment of the optical device 8, consists of periodically offset folds. Whereas in the preceding exemplary embodiments the surfaces of the optical device 8 were arranged substantially parallel to the energy converter 6, the optical device 8 in the third exemplary embodiment is arranged at an angle which corresponds to that in FIG Substantially perpendicular to the earth impinging radiation distributed to a larger optical device and this can diffract more precisely to the energy converter 6.

In this embodiment, both the base portion 32 and the web portion 26 made of an aluminum extruded profile. In this case, a section of the holding element 4 facing the energy converter 6 is provided with a mirror surface 34. This mirror surface 34 can both by a surface treatment, such. As polishing, the existing support member 4 or by applying a reflective coating on the support member 4 and by applying an additional reflective element to the support member 4 are created.

This mirror property of the holding element 4 makes it possible for the energy converter arrangement 2 to direct a third additional radiation onto the energy converter 6 in addition to the indirect radiation through the optical device 8 and the direct radiation directly onto the energy converter 6. In this case, radiation incident on the mirror surface 34 of the holding element 4 is conducted from a radiation source or a radiation transmitter via the reflection of the mirror surface 34 onto the energy converter 6. By this third radiation to the energy converter 6, the total loading of the energy converter 6 and thus the overall efficiency of the photovoltaic system increases.

FIG. 5 shows a fourth exemplary embodiment of the energy converter arrangements 2, which, viewed in cross section, are mounted side by side on a substructure 10. The energy converter arrangements 2, consisting of the holding element 4, the energy converter 6 and the optical device 8, are thereby supported by a base section 32, which receives the optical device 8 and the energy converter 6 at the back. Due to the rear receptacle, this construction essentially dispenses with the optical receptacle 22 and the energy converter receptacle 28, resulting in a larger optical surface or energy-transforming surface, since the edge regions can be omitted for attachment and can be used to generate energy. The base portion 32 of this embodiment is so sturdily built that it carries all the components attached thereto and additionally has a periodically inserted reinforcement 36 which supports the optical device 8 at regular intervals and avoids sagging thereof. A located between the base portion and substructure elastic member 38 can absorb vibrations, vibrations and torsion of the photovoltaic system 1, so that these impairments neither damage to the functional parts, such. As optical device 8 or energy converter 6, and can not reduce the efficiency of the system due to tracking inaccuracy resulting from torsion inaccuracy of the optical device 8 resulting beam deflection,

A Nachführbewegung the energy conversion arrangements 2 according to the position of the sun can be done both by a drive 20, which transmits the tracking movement to the substructure 10 by means of a push rod, a gear drive or the like, so that the entirety of the Energiewandieranordnungen mounted on cross members 12 to a common Fulcrum D track the position of the sun.

As an alternative to this type of tracking, a cross member 12, which is designed to be particularly torsionally rigid, can transmit the tracking movement to the energy-transforming arrangements 2 by means of a cable arrangement 40. For this purpose, 12 shots for the cable assembly 40 are in the cross member. This cable assembly 40 consists of substantially parallel to each other stretched cables that can connect several photovoltaic systems together, the applied cable tension of cross member 12 will pass to cross member 12. If the tension cables are stretched in a polygonal manner according to the Jawerth cable-tie principle, a particularly small deflection of the rope-braced substructure 10 is made possible. The tracking movement of such a cable-tensioned photovoltaic system 1 is also made possible by means of a drive 20 about a pivot point D.

FIG. 6 shows a fifth exemplary embodiment of the energy-transforming arrangements 2, which, seen in cross-section, are mounted side by side on a construction consisting of holding cheeks 42. These holding cheeks 42 receive the optical devices 8 and the energy converters 6 by means of supporting elements 44 on their end faces, so that they rotate in a particularly simple manner about the pivot point D of the probe. let track. In order to prevent any deflection of the optical device 8 or the energy converter 6, holding elements 4 can be mounted between the elements. As an alternative to the rigid attachment of the support elements to the retaining cheeks, it is possible to attach a bolt 46 to the retaining cheeks 42, which rotatably supports the supporting elements 44 and the optical devices 8 and energy converters 6 fixed therebetween. This construction allows a relatively flat design of the retaining walls 42, which thus shade a smaller portion of the energy converter 6 in obliquely impinging sun rays, for example in the spring or fall.

FIG. 7 shows a variant of the solar system. It has substantially the same structure as the variants described above, with the special feature that it has a plane of symmetry ES. The lying on one side of the plane of symmetry energy converter assemblies 2 are arranged and formed in mirror image to the lying on the other side of the plane of symmetry energy converter assemblies 2. As a result, the pivot point D of the system can be placed higher and thus closer to the system center of gravity than in the embodiment according to FIGS. 3 to 6, whereby it is possible to reduce the required adjustment forces.

Another variant of the system is shown in FIGS. 8 and 9. Here, the optical device 8 is replaced by a device 108, 109, in which two series-connected diffraction elements are provided. With regard to the details and advantages of this optical device, reference is made to the content of the German patent application DE 10 2009 002 508.1 filed with equal priority in the name of the Applicant, the disclosure of which is expressly incorporated into this application.

8 shows the cross section of a preferred variant of the optical device, comprising the first diffraction element 108, the second diffraction element 109 and connecting elements 110. In this case, the first diffraction element 108 is arranged closer to the radiation source in the beam path, so that through the first diffraction element 108 passes the beam path is directed to the second diffraction element 109. The connecting elements 110 are arranged in such a way between the diffraction elements 108, 109, that this one-piece optical device 100 form. For this purpose, the distances between the diffraction elements 108, 109 are closed by the connecting elements 110. These distances vary when the two diffraction surfaces 108, 109 are mutually spaced at an angle [A].

The embodiment of an optical device 100 shown in FIG. 8 discloses diffractive elements 108, 109 whose surfaces are differently pronounced. In this case, the one surface has a substantially smooth surface structure, whereas the second surface carries a beam deflection device in the form of prisms. The resulting Fresnel lens allows diffractions that can deflect the beam path 120 in parallel, focus or scatter.

As an alternative to the embodiment of the diffraction elements 108, 109 shown here, they can also carry beam deflection devices on both surfaces or even bend with beam deflection devices differing from one another. In addition, a different configuration of the first diffraction element 108 to the second diffraction element 109 is possible, so that, for example, the first diffraction element 108 in contrast to the second diffraction element 109 carries no beam deflecting device. To protect the surfaces of the optical device, the diffraction elements 108, 109 may not have protective elements which protect the surface structure of the diffraction elements 108, 109 from contamination or environmental influences. It is also possible to equip at least one outer surface of the optical device with a self-cleaning surface structure with a so-called "lotus effect", so that separate protective elements can be dispensed with.

A ray bundle 120 that essentially meets the optical device 100 substantially parallel is shown in FIG. 8. The energy converter arrangement 2, which is aimed with the aim to direct a maximum of radiation energy to the energy converter 6 is tracked to the sun and thereby tends the optical device 1 in such a way that the beam path 120 hits the energy converter 6 precisely in a predetermined manner. The necessary for this total diffraction is distributed in the embodiment shown here of the optical device 1 to at least two diffractions. The beam path diffracted by the optical device 100 onto the energy converter 6 is dependent on the nature of the diffraction elements 108, 109. A particularly preferred embodiment of the diffraction composition is shown in FIG. The total deflection angle necessary for maximizing the energy of the solar system results from a plurality of successive diffractions. These can arise from different diffraction types and / or different optics. In this case, the first optical device consists of a Fresnel lens 108 whose prisms are arranged in the beam path down and a second diffraction element 109 from a Fresnel lens whose prisms in the beam path to the top. The prism-facing surface of the optical devices 108, 109 may have a substantially smooth surface structure, which may also have a self-cleaning microstructure.

This results in the following beam path, the beam path generally following the Snellius laws of refraction. If the surface of the first diffraction element 108 is at right angles to the incident beam path, the incident beam generates only minimal reflection due to the surface properties. If the surface of the first diffraction element 108 is slightly angled toward the beam path, the beam path is refracted toward the solder, which slightly increases the loss reflection on the one hand, but reduces the risk of total reflection when encountering another diffraction surface. The deflected beam path 120 strikes the Fresnel lens and is thereby guided away from the solder and in the direction of the energy converter arrangement through the hollow chamber region of the optical device. From this particularly protected area, the beam path 120 again encounters a Fresnel lens, which guides the beam toward the solder through the second diffraction element 109. Upon exiting the second diffraction element 109, the beam path 120 is deflected to the final overall diffraction angle in the direction of the energy converter 6.

For fixing the optical device 100 to an energy converter arrangement 2, a holding region 122 is provided, in which the optical device 1 is designed to be particularly stable, so that engaging, not shown, fastening elements can receive and fix the optical device 100. The perspective view of an optical device 100 shown in FIG. 9 shows the essential components consisting of the first bending element 108, the second bending element 109 and the connecting elements 110. The perspective view also shows the linear extension of the components shown previously in cross section. This in the longitudinal direction of a solar system extending components form in their entirety an optical device 100 which is similar to a Holkörperprofil created, and thus very stable and torsionally rigid.

Of course, deviations from the variants described are possible without departing from the spirit of the invention. For the components 32 and / or 28 and or 34 and / or 22, extruded or injection molded or rolled components made of plastic or metal, e.g. Alloy can exist.

In addition to uniaxial azimuth tracking, elevation adjustment or tracking may also be provided.

The Fresnel structure or a protective layer for the Fresnel structure can be made so fine that results in a microstructured surface with a self-cleaning effect (lotus effect).

The presented invention is not limited to the use of photovoltaic cells as energy converter 6. Rather, the invention shows ways to impose more solar radiation on various types of energy converters to create more efficient efficiencies.

The invention shows a solar system in the particular embodiment of a photovoltaic system 1 with a plurality of juxtaposed energy converter assemblies 2, each with a holding element 4, an energy converter 6 and an optical device 8 disclosed, with a beam path to the energy converter 6 can be directed, the optical device 8 is arranged closer to a radiation source. The photovoltaic system 1 shows an asymmetric arrangement of the optical device 8 to the energy converter 6, wherein the optical device 8 of the energy converter Order 2 is directed to the energy converter 6 an adjacent energy converter assembly 2.

LIST OF REFERENCES:

1 photovoltaic system

2 energy converter arrangement

4 retaining element

6 energy converters

8 optical device

10 substructure

12 cross members

14 frame

16 tracking device

18 foundation

20 drive

22 optical recording

24 clamping element

26 bridge section

28 energy converter recording

30 wind deflector

32 basic section

34 mirror surface

36 reinforcement

38 elastic element

40 rope arrangement

42 retaining cheeks

44 support elements

46 bolts

D pivot point

B diffraction angle

Claims

claims

1. solar system, in particular a photovoltaic system (1), with a plurality of juxtaposed energy converter assemblies (2) each having a holding element (4), an energy converter (6) and an optical device (8) with a beam path to the energy converter (6) can be directed, wherein the optical device (8) is arranged closer to a radiation source, characterized by an asymmetrical arrangement of the optical device (8) to the energy converter, wherein the optical device of the energy converter arrangement is directed to the energy converter of an adjacent energy converter arrangement.

2. Photovoltaic system according to claim 1, wherein the holding element (4) outside the beam path between the optical device (8) of the energy converter assembly (2) and the applied energy converter (6) of an adjacent energy converter arrangement (2) is arranged.

3. Photovoltaic system according to claim 2, wherein the holding element (4) each having an optical receptacle (22), an energy converter receptacle (28) and a web portion (26), wherein the optical receptacle (22) and the energy converter receptacle (28) on different sides of the web portion (26) lie.

4. Photovoltaic system according to claim 3, wherein the optical receptacle (22) and / or the energy converter receptacle (28) are formed so that the respective edge of the optical device (8) and / or the energy converter (6) is enclosed detachably and positively.

5. Photovoltaic system according to claim 4, wherein the holding element (4) has an essentially S-shaped cross-section.

6. Photovoltaic system according to claim 5, wherein the holding element (4) extends perpendicularly and linearly to its cross-sectional area.

7. Photovoltaic system according to claim 6, wherein the holding element (4) has a base portion (32) for attachment to a substructure.

8. Photovoltaic system according to claim 7, wherein the base portion (32) of the holding element comprises an elastic element (38).

9. Photovoltaic system according to claim 8, wherein the holding element (4) receives the optical device (8) and the energy converter (6) at the back.

10. Photovoltaic system according to claim 1, wherein the

Energy converter assemblies (2) between two mutually parallel spaced, holding elements forming retaining cheeks (42) and there are frontally preferably fixed releasably via a support member (44).

11. Photovoltaic system according to claim 10, wherein an additional holding element (4) between the optical device (8) and energy converter (6) is arranged.

12. Photovoltaic system according to claim 11, wherein the support element (44) in each case with the retaining cheek (42) is firmly connected.

13. Photovoltaic system according to claim 11, wherein the two the energy converter assemblies (2) associated end support elements (44) on a bolt (46) which rotatably engages around a common axis in the retaining cheeks (42).

14. Photovoltaic system according to one of claims 1 to 13, wherein a said energy converter (6) facing portion of the holding element (4) has a reflective surface (34) or a reflective element.

15. Photovoltaic system according to claim 14, wherein the angle of attack of the holding element (4) to the vertical between 15 and 45 degrees, in particular between 25 and 30 degrees.

16. Photovoltaic system according to one of claims 1 to 15, wherein the holding element (4) has additional supports.

17. Photovoltaic system according to one of claims 1 to 16, wherein the holding element (4) has heat dissipating properties and / or heat dissipating elements.

18. Photovoltaic system according to one of claims 1 to 17, wherein the optical device (8) is an optical beam deflection device.

19. Photovoltaic system according to claim 18, wherein the beam deflection device (8) has a - possibly protected with glass - Fresnel lens structure.

20. Photovoltaic system according to claim 19, wherein the diffraction angle (B) of the beam deflecting device (8) on the energy converter (6) is between 15 and 60 degrees, preferably between 18 and 60 °.

21. Photovoltaic system according to claim 19 or 20, wherein the

Beam deflection device (8) sections with different diffraction angles (B).

22. Photovoltaic system according to one of claims 19 to 21, wherein the optical device (8) and / or the energy converter (6) have an arcuate cross-section.

23. Photovoltaic system according to one of claims 18 to 22, wherein the optical device (8) has regular reinforcements (36).

24. Photovoltaic system according to one of claims 1 to 23, wherein the energy converter (6) is formed from a 2 to 20-fold concentration optimized solar cell.

25. Photovoltaic system according to claim 24, wherein the solar cell has a high conversion efficiency with low shading losses.

26. Photovoltaic system according to one of claims 1 to 25, wherein the energy converter assemblies (2) are mounted on a substructure (10).

27. Photovoltaic system according to claim 26, wherein the substructure (10) has a grid of cross members (12).

28. Photovoltaic system according to claim 27, wherein the substructure (10) by means of a tracking device (16) tracks the energy converter arrangements (2) to the position of the sun.

29. Photovoltaic system according to claim 28, wherein a drive (20) transmits a tracking movement of the tracking device (16) to the cross member (12).

30. Photovoltaic system according to one of claims 26 to 29, wherein the substructure (10) consists of a cable arrangement (40) is formed.

31. Photovoltaic system according to one of claims 1 to 30, wherein the holding element (4) has a wind deflector (30).

32. Photovoltaic system according to one of claims 1 to 31, wherein the energy converter assemblies (2) above the substructure (10) are arranged.

33. Photovoltaic system according to one of claims 1 to 32, wherein the energy converter arrangements (2) are arranged in a 0 ° position of the solar system (1) in such a way that one edge of the optical device (8) of the energy converter arrangement (2) and a Edge of the energy converter (6) of a longitudinally adjacent energy converter arrangement (2) are substantially congruent.