• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The solar generator comprises a flexible support (10), an array of solar cells (5), electrical transfer conductors (120, 130), blocking diodes (17), the solar cells being arranged in different lines (11). transversely, the solar cells located in the same line (11) being connected electrically in series, each line (11) having two opposite ends (12, 13), respectively of positive polarity and negative polarity. The end (12) of positive polarity of each line (11) of solar cells is individually connected to a respective blocking diode (17) via at least one electrical transfer conductor (120) dedicated to said line (11), the electrical transfer conductors (120) dedicated to the different lines (11) being independent of each other, the blocking diodes (17) being located at the proximal end (6) of the solar generator, outside the solar cell network.
    公开号:FR3041816A1
    申请号:FR1501980
    申请日:2015-09-25
    公开日:2017-03-31
    发明作者:Bernard Boulanger；Jean Noel Voirin；Laurent D'abrigeon
    申请人:Thales SA；
    IPC主号:
    专利说明:

    Flexible solar generator with electrical protection against impacts of celestial objects, spacecraft and satellite comprising at least one such solar generator
    The present invention relates to a flexible solar generator provided with an electrical protection against impacts of celestial objects, a spacecraft and a satellite comprising at least one such solar generator. It applies to any solar generator having a flexible support and more particularly to the field of space applications in which solar generators are mounted on spacecraft or satellites in orbit.
    Solar generators mounted on spacecraft, for example satellites, generally comprise an array of solar cells electrically connected to one another and to the satellite, the solar cells covering the surface of support panels being able to transform the energy Solar energy into electrical energy transmitted to the electrical equipment of the satellite. The solar cells can be arranged on several rigid solar panels or on a flexible support, for example a flexible membrane, whose thickness is much thinner than the thickness of the rigid solar panels. Indeed, a flexible solar generator is generally constituted by a flexible support having a front face on which solar cells are mounted, each solar cell being provided with a protective glass window (English: coverglass), a rear face on which are arranged electrical conductors and at least one layer of insulating material, for example Kapton, located between the solar cells and the electrical conductors.
    As shown in the electrical diagram of FIG. 1, the solar cells arranged on the flexible support 10 and located on the same line of the solar generator are generally electrically connected in series, each line 11 (in English: string) having two ends 12, 13 to respectively positive and negative polarity. The ends 12, 13 with positive polarity, respectively negative, of several lines are then electrically connected together to form several different sections 15, 16, each section consisting of a set of several lines electrically connected in parallel. Two sections each consisting of three lines connected in parallel are shown in Figure 1, but generally, the number of lines per section and the number of sections are larger. Each section 15, 16 is then connected to the satellite 20 by two electrical power conductors 15a, 15b, 16a, 16b respectively of positive and negative polarity, also called electrical transfer conductors, dedicated to the transfer of electrical power generated by the section to the satellite. The electrical transfer conductors 15a, 15b, 16a, 16b dedicated to the sections 15, 16 are generally arranged under the solar cells, on the rear face of the flexible support 10 of the solar generator. As the different sections are arranged next to each other in the same longitudinal direction of the solar generator, the electrical power conductors dedicated to the different sections pass under the solar cells of neighboring sections and pass under the entire wing of the solar generator 10 before to be connected to the satellite 20. For example, in FIG. 1, the electrical transfer conductors 15a, 15b of the section 15 pass under the solar cells of the section 16.
    The problem is that in the case of flexible solar generators, the distance separating the solar cells mounted on a front face of the flexible support and the electrical power conductors mounted on a rear face of the flexible support is very small, that is to say say less than one millimeter. This short distance makes solar generators very sensitive to the impacts of celestial objects, in particular the impacts of debris and micrometeorites. Indeed, the impacts, for example of debris or micrometeorites, can pierce locally one or more solar cells as well as the insulators and the power conductors located under the solar cell. The impact creates a plasma bubble which, when the electrical voltage between the impacted solar cell and the electrical conductor is sufficient, for example greater than 50 volts, can generate an electric arc 14 between said impacted solar cell and the electrical conductor placed under this solar cell. If the electric current available at the point of impact is sufficiently high, for example greater than 1.5 amperes, the electric arc can self-sustain, which has the effect of creating a permanent short circuit in a section of the solar generator and a definitive loss of part of the electrical power.
    To protect the solar cells against possible discharge currents from the other lines of the section, each line is generally provided, at its positive polarity end, with a blocking diode 17 making it possible to isolate the lines between them and to limit the intensity of the electric current in each line to a value less than 1.5 Ampere. However, these blocking diodes being located on the flexible support, as close as possible to the solar cells, they protect against arcs generated between solar cells of neighboring lines but do not protect electrical arcs generated between solar cells and electrical conductors. transfer, in particular the electrical transfer conductors having a positive polarity, which run under the solar cells and which are connected at the output of a section of the solar generator. Or at the point of impact, the voltage of an electrical transfer conductor having a positive polarity can be much higher than the voltage of the impacted cell, for example for a line having 50 solar cells connected in series, the voltage an electrical transfer conductor having a positive polarity can reach 100 Volts while the voltage of the negative polarity end of the first cell of a line is zero Volt. In addition, the intensity of the electric current flowing in an electrical transfer conductor connected at the outlet of a section is large, generally much greater than 1.5 Ampere. When a micrometeorite passes through the solar generator and makes a hole in a solar cell and in the insulator between the solar cell and a positive polarity transfer electric conductor located under the solar cell, an electric arc is created and self - maintains between the electrical power conductor and the impacted solar cell. A short circuit is then generated between the impacted cell and the positive polarity transfer electric conductor 15a which passes under said impacted cell. An electric arc current I then flows from the positive polarity transfer electric conductor 15a to a negative polarity transfer electric conductor 16b connected to the negative end of the solar cell line in which the impact has occurred. Since the negative polarity transfer electric conductors are all interconnected in the satellite 20, the electric arc current I reverses, by a negative polarity transfer electric conductor, in the electrical circuit of the section 15 which passes through under the impacted cell. Said section 15 is then short-circuited and can no longer supply power to the solar generator. This loss of power corresponding to the loss of a complete section of the solar generator is detrimental to the power supply of the equipment on board the satellite.
    To avoid arcing between a solar cell and an electrical transfer conductor, it is possible to route the transfer conductors on the edges of the solar generator instead of making them walk on the back side, under the solar cells . However, the electrical transfer conductors also provide a role of shielding the rear face of the solar generator against radiation, including electron fluxes and proton fluxes, which degrade the electrical performance of solar cells with the effect of reducing the electric power available. Therefore, if the electrical transfer conductors are moved to the edges of the solar generator, they can no longer perform the role of shielding and it is then necessary to add a specific shielding device to protect the back side of the solar generator, this which increases the mass of the solar generator.
    An object of the invention is to overcome the drawbacks of known flexible solar generators and to make a flexible solar generator with electrical protection against impacts of celestial objects, in particular debris and micrometeorites, which allows to limit the intensity of the electric current between the solar cells and transfer electric conductors located under the solar cells without penalizing the electrical power generated by the solar generator, to improve the holding of the solar generator and to avoid the loss of power during the creation of the solar generator. a permanent electric arc between a solar cell pierced by an impact and an electric transfer conductor running under the impacted solar cell.
    Another object of the invention is to provide a flexible solar generator comprising an electrical protection against impacts of celestial objects, also making it possible to shield the rear face of the solar generator without increasing the mass or the bulk. , solar generator, compared to known flexible solar generators.
    For this, the invention relates to a solar generator intended to be fixed on a spacecraft, the solar generator extending along a longitudinal deployment axis Y and having a proximal end intended to be connected to the spacecraft and a distal end opposite to the proximal end, the solar generator comprising a flexible support consisting of a multilayer substrate equipped with electrical transfer conductors, a solar cell array arranged on a front face of the flexible support, blocking diodes, the solar cells being arranged in different transverse lines, spaced from each other, the solar cells located in the same line being connected electrically in series, the different solar cell lines being electrically independent of each other, each line having two opposite ends, respectively of polarity positive and pol negative arity, the electrical transfer conductors being intended to convey the electrical energy delivered by the solar cell lines to the spacecraft. The positive polarity end of each solar cell line is individually connected to a respective blocking diode via at least one electrical transfer conductor dedicated to said line, the transfer electric conductors dedicated to the different lines being independent from each other, the blocking diodes being located at the proximal end of the solar generator, outside the solar cell array.
    Advantageously, the multilayer substrate comprises at least two layers of electrical insulation located between the electrical transfer conductors and the solar cells bonded to the front face of the flexible support, the electrical transfer conductors can be arranged on a rear face of the flexible support.
    Alternatively, the multilayer substrate may comprise at least two layers of electrical insulation and a flexible printed circuit comprising at least one layer of etched conductive tracks sandwiched between the two layers of electrical insulator, the electrical transfer conductors being constituted by the engraved conductive tracks.
    Alternatively, the multilayer substrate may comprise three layers of electrical insulation and a flexible printed circuit comprising two stacked layers provided with etched conductive tracks, each layer of etched conductive tracks being respectively sandwiched between two layers of electrical insulation of the flexible support, the electrical transfer conductors being formed by the etched conductive tracks.
    Advantageously, the etched conductive tracks located in the two stacked layers may be arranged in staggered relation to one another.
    Advantageously, the etched conductive tracks located in the two stacked layers may overlap each other partially.
    Advantageously, the blocking diodes may be located on the flexible support, at the proximal end of the solar generator, in a virgin area free of solar cells.
    Alternatively, the solar generator may further comprise a mechanical interface to which is fixed the flexible support, and the blocking diodes may be located on the mechanical interface, outside the flexible support.
    Advantageously, the solar generator may comprise a power conditioning device intended to manage the electrical energy delivered by all the solar cell lines, the power conditioning device being connected to all the electrical transfer conductors, the conditioning device of power comprising electrical connection means able to connect several lines of the solar generator, in parallel, to form different sections of solar cells. The invention also relates to a spacecraft and a satellite comprising at least one such solar generator. Other features and advantages of the invention will become clear in the following description given by way of purely illustrative and non-limiting example, with reference to the accompanying schematic drawings which show: FIG. 1: a diagram of an example of wiring electric solar cells of a solar generator, according to the prior art; FIG. 2: a diagram illustrating a satellite provided with a flexible solar generator, in the deployed position, according to the invention; FIG. 3: a diagram of an example of electrical wiring of the solar cells of a solar generator, the blocking diodes being mounted on the flexible support, according to a first embodiment of the invention; FIG. 4: a diagram of a variant of the electrical wiring of the solar cells of a solar generator, the blocking diodes being mounted outside the flexible support, according to a second embodiment of the invention; FIG. 5 is a cross-sectional diagram of an example of a flexible support consisting of a multilayer substrate comprising a monolayer printed circuit integrated between two layers of insulation, according to the invention; FIGS. 6a and 6b: two cross-sectional drawings, respectively a) without overlapping the tracks, b) with overlapping tracks, with an example of a flexible support consisting of a multilayer substrate comprising a printed circuit provided with two layers of conductive tracks , engraved, each layer of etched tracks being sandwiched between two layers of insulation, according to the invention. Generally, a spacecraft, for example a satellite, comprises solar generator wings intended to provide the electrical power necessary for the operation of the equipment mounted on the satellite. The number of solar generator wings depends on the mission to be fulfilled by the spacecraft. Often, two solar generator wings are mounted symmetrically on either side of a spacecraft, on two opposite sides of the spacecraft. To optimize the illumination of the solar generator wings, the solar generators of each wing are generally fixed at the end of a remote arm intended to be fixed on a sidewall of the spacecraft. In the example of Figure 2, to simplify the description of the invention, a single solar generator wing is shown, but of course, the number of solar generator wings may be greater than one.
    According to the invention, the solar generator extends along a longitudinal deployment axis Y and has a proximal end 6 intended to be connected to the spacecraft and a distal end 7 opposite to the proximal end. The solar generator comprises a planar flexible support 10 equipped with electrical transfer conductors (120, 130) and a solar cell array 5 arranged on a front face of the flexible support. The flexible support can be attached directly to a remote arm 40 or alternatively to a mechanical interface 30 mounted at a first end of a remote arm 40, the remote arm 40 having a second end to be fixed on a side 21 of the spacecraft 20. In the deployed position, the flexible support 10 consists of a flat surface extending along an XY plane, the Y direction being orthogonal to the side 21 of the spacecraft 20 on which the removal arm 40 is intended to be fixed. The array of solar cells 5 mounted on the front face of the flexible support 10 is located between the proximal end 6 and distal 7 of the solar generator. In one embodiment of the invention, the array of solar cells may not extend to the proximal end to leave, on the front face of the flexible support, at the proximal end, a blank area 8 free of solar cells.
    The diagrams of FIGS. 3 and 4 illustrate examples of electrical wiring of the solar cells, according to the invention. As illustrated in these examples, the solar cells of the network can be arranged along different transverse lines, spaced apart from each other. The lines 11 of solar cells may be parallel to each other and to the X direction, but this is not mandatory. The solar cells located on the same line 11 of the solar generator are connected electrically in series, the different solar cell lines being electrically independent of each other and having two ends 12, 13 respectively positive and negative polarity. The two ends of each line 11 of solar cells are respectively connected to two dedicated electrical transfer conductors 120, 130, intended to transmit the energy, respectively positive and negative polarity, generated by the line 11 of solar cells to a maximum of power conditioning device 31 located outside the flexible support, for example on the mechanical interface 30 as shown in FIG. 4, or in the spacecraft 20. The electrical transfer conductors 120, 130 therefore traverse transversely relative to the lines 11 of solar cells and pass successively under the various lines 11 of solar cells of the network arranged on the front face of the flexible support, between the line 11 considered and the proximal end 6. The electrical transfer conductors 120, 130 dedicated to each line 11 of solar cells are directly connected to the conditioning device Thus, each line 11 is individually connected to the power conditioning device 31, which makes it possible to process the electrical power generated by the solar generator outside the flexible support 10. and to limit the intensity of the electric currents flowing in the positive polarity transfer conductors 120, located on the rear face of the flexible support, since the electric current then corresponds to that created by a single line of the solar generator. In the power conditioning device 31, the positive polarity transfer conductors 120, dedicated to each line, are connected to a respective blocking diode 17, each blocking diode being dedicated to the protection of a line of the solar generator against discharge currents from other lines. To have redundancy, there can be two dedicated electrical transfer conductors for each line of solar cells and a blocking diode connected to the two corresponding electrical transfer conductors. The various blocking diodes are located at the proximal end 6 of the solar generator, outside the solar cell array. For example, as shown in FIG. 3, the blocking diodes 17 can be located on the flexible support 10, at the proximal end 6 of the solar generator, in the blank zone 8 free of solar cells, on the front or rear face , or alternatively, outside the flexible support, for example on the mechanical interface 30, as shown in FIG. 4, or in the spacecraft 20. At the output of the blocking diodes 17, the power conditioning device comprises first and second connection means 32, 33 capable of grouping the lines 11 of solar cells into different sections, each section comprising several lines of solar cells connected in parallel. In each section, the first connection means 32 connect the positive polarity transfer electric conductors dedicated to the lines of the section. The transfer electric conductors 130 of negative polarity are all interconnected by the second connection means 33 in the power conditioning device 31.
    The flexible support consists of a planar multilayer substrate comprising electric transfer conductors and at least two layers of electrical insulation, for example Kapton, located between the electrical transfer conductors and the solar cells bonded to the front face of the support flexible. The electrical transfer conductors may consist of electric cables arranged on the rear face of the flexible support 10. Alternatively, the electrical transfer conductors may be formed by conductive tracks, for example made of silver, etched on a flexible printed circuit, the circuit printed circuit being integrated in the multilayer substrate of the flexible support 10. The printed circuit may be monolayer as shown in Figure 5, or multilayer as shown in Figures 6a and 6b. When the printed circuit is monolayer, the printed circuit layer 50 is sandwiched between two layers of electrical insulation 51, 52 of the flexible support and the different tracks 54, 55 of the layer 50 are isolated from each other by a space 58. Due to the space 58 between the tracks 54, 55, this configuration does not make it possible to ensure complete shielding of the rear face of the flexible support. When the printed circuit is multilayer, as in Figure 6a, the tracks 54, 55, 56, 57 of the printed circuit can be arranged in staggered rows in two different layers 59, 50, respectively lower and upper, stacked one above on the other, each layer 59, 50 of etched tracks being sandwiched between two layers of electrical insulator 51, 52, 53 of the flexible support. In this configuration, as in FIG. 6b, there may be a partial overlap between the tracks of the upper layer 50 of the printed circuit and the tracks of the lower layer 59 of the printed circuit. This configuration therefore makes it possible to ensure complete shielding of the rear face of the flexible support.
    The lines 11 independent of each other, not being grouped in sections on the flexible support 10, each positive polarity transfer electric conductor 120 which travels under the solar cells, transports the electrical energy generated by a single line of solar cells, to the mechanical interface 30. All 120 electrical transfer conductors positive polarity, dedicated to the different lines are therefore independent of each other. The electric current flowing in the electrical transfer conductors are therefore low, that is to say less than 1.5 amperes. Therefore, in case of impact, for example debris or micrometeorite, on a line 11 of solar cells, the electric arc 14 created by the impact will go out because the discharge current is limited to that of the only line 11 impacted, thanks to the blocking diode 17 dedicated to the protection of this line 11 impacted.
    In addition, the blocking diodes 17 being located outside the solar cell array, the entire surface of the solar generator is protected against possible discharge currents from any line 11. In the presence of an impact hole in a line of the solar generator, a single line will eventually be short-circuited and no longer provide power, as shown by the arrows symbolizing the path of the short-circuit current I in the figures 3 and 4. The power loss of the solar generator, limited to that created by a line 11, will be much lower than in today's flexible solar generators.
    In the presence of an impact hole on two superimposed electrical conductors, insulated and of different polarities, on the surface of the solar generator, thus protected, the current is also limited in the case of an electric arc between the positive and negative electrical conductor. the electrical conductor of negative polarity. This protection is effective against arcing between solar cells and electrical conductors, but also between electrical conductors of different polarities. The mechanical interface 30 may, for example, be mounted on the remote arm 40 connected to the spacecraft 20 as illustrated in FIG. 2, or may be directly mounted on the spacecraft 20.
    The electrical transfer conductors 120, 130, located on the rear face of the flexible support or integrated into the substrate of the flexible support, and running transversely with respect to the lines 11 of solar cells, furthermore provide a shielding function of the rear face of the solar generator without the need to add additional specific shielding. The mass and size of the solar generator are optimized.
    Although the invention has been described in connection with particular embodiments, it is obvious that it is not limited thereto and that it includes all the technical equivalents of the means described and their combinations if they are within the scope of the invention.
    权利要求:
    Claims (11)
    [1" id="c-fr-0001]
    1. Solar generator intended to be fixed on a spacecraft, the solar generator extending along a longitudinal deployment axis Y and having a proximal end (6) intended to be connected to the spacecraft and a distal end (7) opposed to the proximal end, the solar generator comprising a flexible support (10) consisting of a multilayer substrate equipped with electrical transfer conductors (120, 130), a solar cell array (5) arranged on a front face of the flexible support ( 10), blocking diodes (17), the solar cells being arranged along different transverse lines (11) spaced apart from each other, the solar cells located in the same line (11) being electrically connected in series, the different lines (11) solar cells being electrically independent of each other, each line (11) having two opposite ends (12, 13), respectively of positive polarity and negative polarity, the electrical transfer conductors (120, 130) being intended to convey electrical energy delivered by the lines (11) of solar cells to the spacecraft, characterized in that the end (12) of positive polarity of each line (11) of solar cells is individually connected to a respective blocking diode (17) via at least one electric transfer conductor (120) dedicated to said line (11). ), the electrical transfer conductors (120) dedicated to the different lines (11) being independent of one another, the blocking diodes (17) being located at the proximal end (6) of the solar generator, outside the network of solar cells.
    [2" id="c-fr-0002]
    2. Solar generator according to claim 1, characterized in that the multilayer substrate comprises at least two layers of electrical insulation located between the electrical transfer conductors and the solar cells bonded to the front face of the flexible support, the electrical transfer conductors. (120, 130) being arranged on a rear face of the flexible support.
    [3" id="c-fr-0003]
    3. Solar generator according to claim 1, characterized in that the multilayer substrate comprises at least two layers of electrical insulation (51, 52) and a flexible printed circuit comprising at least one layer (50) of etched conductive tracks sandwiched between the two layers of electrical insulation, the electrical transfer conductors (120, 130) being constituted by the etched conductive tracks (54, 55).
    [4" id="c-fr-0004]
    4. Solar generator according to claim 1, characterized in that the multilayer substrate comprises three layers of electrical insulation (51, 52, 53) and a flexible printed circuit comprising two stacked layers (50, 59) provided with etched conductive tracks ( 54, 55, 56, 57), each layer of etched conductive tracks being respectively sandwiched between two layers of electrical insulation of the flexible support, the electrical transfer conductors (120, 130) being constituted by the etched conductive tracks (54). , 55, 56, 57).
    [5" id="c-fr-0005]
    5. Solar generator according to claim 4, characterized in that the etched conductive tracks (54, 55, 56, 57) in the two layers (50, 59) stacked, are arranged in staggered relation to each other.
    [6" id="c-fr-0006]
    6. Solar generator according to claim 5, characterized in that the etched conductive tracks located in the two stacked layers, overlap partially between them.
    [7" id="c-fr-0007]
    Solar generator according to one of Claims 1 to 6, characterized in that the blocking diodes (17) are located on the flexible support (10) at the proximal end of the solar generator in a blank zone (8). ) free of solar cells.
    [8" id="c-fr-0008]
    8. Solar generator according to one of claims 1 to 6, characterized in that it further comprises a mechanical interface (30) to which is fixed the flexible support (10), and in that the blocking diodes (17). ) are located on the mechanical interface (30), outside the flexible support (10).
    [9" id="c-fr-0009]
    9. Solar generator according to one of claims 1 to 8, characterized in that it further comprises a power conditioning device (31) for managing the electrical energy delivered by all solar cell lines, the device power conditioning device (31) being connected to all the electrical transfer conductors (120, 130), the power conditioning device having electrical connection means (32, 33) adapted to connect a plurality of lines (11) of the solar generator , in parallel, to form different sections of solar cells ,.
    [10" id="c-fr-0010]
    10. Spatial machine characterized in that it comprises at least one solar generator according to one of claims 1 to 9.
    [11" id="c-fr-0011]
    11. Spacecraft according to claim 10, characterized in that it is constituted by a satellite.
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    同族专利:
    公开号 | 公开日
    FR3041816B1|2017-10-20|
    US20170093326A1|2017-03-30|
    JP2017063606A|2017-03-30|
    CN107026598B|2020-01-14|
    US10014817B2|2018-07-03|
    JP6877931B2|2021-05-26|
    EP3147952B1|2018-11-28|
    CN107026598A|2017-08-08|
    CA2943026A1|2017-03-25|
    EP3147952A1|2017-03-29|
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    法律状态:
    2016-08-26| PLFP| Fee payment|Year of fee payment: 2 |
    2017-03-31| PLSC| Search report ready|Effective date: 20170331 |
    2017-08-29| PLFP| Fee payment|Year of fee payment: 3 |
    2018-08-28| PLFP| Fee payment|Year of fee payment: 4 |
    2019-08-29| PLFP| Fee payment|Year of fee payment: 5 |
    2020-08-26| PLFP| Fee payment|Year of fee payment: 6 |
    2021-08-26| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1501980A|FR3041816B1|2015-09-25|2015-09-25|FLEXIBLE SOLAR GENERATOR WITH ELECTRICAL PROTECTION AGAINST IMPACTS OF CELESTIAL OBJECTS, SPACE AND SATELLITE HAVING AT LEAST ONE SUCH SOLAR GENERATOR|FR1501980A| FR3041816B1|2015-09-25|2015-09-25|FLEXIBLE SOLAR GENERATOR WITH ELECTRICAL PROTECTION AGAINST IMPACTS OF CELESTIAL OBJECTS, SPACE AND SATELLITE HAVING AT LEAST ONE SUCH SOLAR GENERATOR|
    EP16189831.7A| EP3147952B1|2015-09-25|2016-09-21|Flexible solar generator provided with electrical protection against impacts of celestial objects, spacecraft and satellite comprising at least one such solar generator|
    US15/273,435| US10014817B2|2015-09-25|2016-09-22|Flexible solar generator provided with electrical protection against the impact of celestial objects, spacecraft and satellite comprising at least one such solar generator|
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