Power conversion device, power receiving system, and control method thereof

Abstract

To provide a power conversion device, a power reception system, and a control method therefor for improving power reception efficiency by achieving continuous and efficient power reception.SOLUTION: Provided is a power conversion device for receiving electromagnetic waves transmitted from the space for conversion into power, the power conversion device including: a power conversion unit that receives the electromagnetic waves transmitted from the space for conversion into power; a propulsion unit or a driving device that moves the power conversion device; a positioning device that specifies the position of the power conversion device; a control device that controls the propulsion unit or the driving device based on the position and information about the power received by the power conversion unit; and a power supply device that supplies the power received by the power conversion unit to an electric system.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power conversion device, a power receiving system, and a control method thereof in a space solar power generation system. [Background technology]

[0002] As one type of renewable energy, Space Solar Power Satellite / Station / Systems (SSPS or SPS) have been proposed, which convert solar energy in outer space into electrical energy using solar panels mounted on artificial satellites, etc., and transmit the power to the ground using electromagnetic waves such as microwaves and laser light.

[0003] Space solar power generation systems have attracted attention because, compared to terrestrial solar power generation, they are not affected by weather, can generate power day or night, and have the advantage of high sunlight density.Various technologies have been proposed for space solar power generation systems to efficiently transmit power generated in space to the ground.

[0004] For example, Patent Document 1 discloses a space solar power generation system in which a space solar power generation satellite equipped with solar cells that convert solar energy into electrical energy and a device that converts this electrical energy into microwave energy irradiates microwave energy onto the Earth, and a rectenna installed on the ground receives the microwave energy and converts it into electricity to transport the energy. Here, the rectenna is a device composed of an antenna and a rectifier circuit that extracts DC power from electromagnetic waves such as microwaves. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] US2013 / 0032673 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in conventional space solar power generation systems, the rectenna cannot be easily moved, and therefore, for example, the power receiving system must be stopped when repairing or maintaining the rectenna, which poses a problem of reduced power receiving efficiency over the product life cycle of the power receiving system. In this regard, Patent Document 1 does not take into consideration the power receiving efficiency over the product life cycle.

[0007] In view of the above, an object of the present invention is to provide a power conversion device, a power receiving system, and a control method thereof that improve power receiving efficiency by realizing continuous and efficient power reception. [Means for solving the problem]

[0008] In view of the above, the present invention is defined as "a power conversion device that receives electromagnetic waves transmitted from outer space and converts them into electric power, the power conversion device comprising: a power conversion unit that receives electromagnetic waves transmitted from outer space and converts them into electric power; a propulsion device or drive unit that moves the power conversion device; a positioning device that identifies the position of the power conversion device; a control device that controls the propulsion device or drive unit based on information about the position and the electric power received by the power conversion unit; and a power supply device that supplies the electric power received by the power conversion unit to an electrical system."

[0009] Furthermore, the present invention provides a "power receiving system characterized in that a plurality of power conversion devices are connected to a power grid via a power receiving station."

[0010] Furthermore, the present invention provides "a control method for a power conversion device that receives electromagnetic waves transmitted from outer space and converts them into electric power, comprising: a power conversion unit that receives electromagnetic waves transmitted from outer space and converts them into electric power; a propulsion unit or drive unit that moves the power conversion device; a positioning device that identifies the position of the power conversion device; a control device that controls the propulsion unit or drive unit based on information on the position and the electric power received by the power conversion unit; and a power supply device that supplies the electric power received by the power conversion unit to an electrical system, wherein the control device analyzes information obtained from the power conversion device and the positioning device and changes the position of the power conversion device." Furthermore, the present invention provides a "control method for a power receiving system in which a plurality of power conversion devices that receive electromagnetic waves transmitted from outer space and convert them into electric power are connected to a power system via a power receiving station, wherein each power conversion device comprises a power conversion unit that receives electromagnetic waves transmitted from outer space and converts them into electric power, a propulsion unit or drive unit that moves the power conversion device, a positioning device that identifies the position of the power conversion device, a control device that controls the propulsion unit or drive unit based on information about the position and the electric power received by the power conversion unit, and a power supply device that supplies the electric power received by the power conversion unit to the electrical system, wherein the control device of each power conversion device analyzes information obtained from the power conversion device and the positioning device and changes the position of the power conversion device." [Effects of the Invention]

[0011] According to the power receiving system of the present invention, by using a plurality of power conversion devices that can move with electromagnetic waves transmitted from outer space to continuously and efficiently receive power, it is possible to provide a power conversion device, a power receiving system, and a control method thereof that have improved power receiving efficiency. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram showing an example of the schematic configuration of an entire space solar power generation system. [Figure 2] FIG. 1 is a block diagram showing an example of the schematic configuration of an entire space solar power generation system. [Figure 3a]FIG. 10 is a diagram showing an example in which the energy intensity distribution of an electromagnetic wave is a Gaussian distribution. [Figure 3b] 10A and 10B are diagrams showing examples of an energy intensity distribution of an electromagnetic wave having side lobes or grating lobes; [Figure 4] FIG. 2 is a block diagram illustrating the power receiving system in more detail. [Figure 5] FIG. 1 is a perspective view showing a structural example of a power conversion device. [Figure 6] FIG. 2 is a sequence diagram showing the flow of information and power in the power receiving system. [Figure 7] FIG. 2 is a flowchart showing the operation of the power conversion device according to the first embodiment. [Figure 8] 2 is a schematic diagram illustrating the operation of the power conversion device according to the first embodiment. FIG. [Figure 9] FIG. 10 is a flowchart showing the operation of the power conversion device according to the second embodiment. [Figure 10] FIG. 10 is a schematic diagram illustrating the operation of the power conversion device according to the second embodiment. [Figure 11] FIG. 10 is a flowchart showing the operation of the power conversion device according to the third embodiment. [Figure 12] FIG. 10 is a schematic diagram illustrating the operation of the power conversion device according to the third embodiment. [Figure 13] FIG. 10 is a schematic diagram illustrating the configuration of a space solar power generation system according to a fourth embodiment. [Figure 14] FIG. 10 is a block diagram illustrating the configuration of a space solar power generation system according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0014] In the drawings, functionally identical elements may be designated by the same numerals. The drawings illustrate embodiments and implementations according to the principles of the present invention, but these are for understanding the present invention and should not be used to interpret the present invention in a limiting sense. The descriptions in this specification are merely typical examples and are not intended to limit the scope or application of the present invention in any way.

[0015] Although the present embodiment has been described in sufficient detail to enable those skilled in the art to practice the present invention, it should be understood that other implementations and forms are possible, and that changes in configuration and structure and substitutions of various elements are possible without departing from the scope and spirit of the technical concept of the present invention. Therefore, the following description should not be interpreted as being limited thereto. [Example]

[0016] An example of the schematic configuration of a space solar power generation system will be described with reference to Figures 1 and 2. Figure 1 shows an example of the schematic configuration of the entire space solar power generation system made up of space facilities and ground facilities, and Figure 2 is a block diagram of the space solar power generation system.

[0017] As shown in Figures 1 and 2, a space solar power generation system transmits electromagnetic waves 2, such as microwaves or laser light, from an artificial satellite 1, which is a space facility. In response, the ground facility is configured to supply power to a power grid 7 via a power receiving system 3, which is made up of multiple power converters 4 that receive the electromagnetic waves 2 and convert them into electric power, a power receiving station 5 electrically connected to the power converters 4, and an electric wire (or wireless power transmission system) 6. Note that there is a one-to-one relationship between the power converters 4 and the power receiving stations 5, and the multiple power converters 4 form a formation to receive the electromagnetic waves 2 transmitted by the artificial satellite 1.

[0018] As an example, the artificial satellite 1 is a geostationary satellite that flies in a geostationary orbit (approximately 36,000 km above the equator) and is equipped with solar panels (e.g., approximately 2.5 km x 2.5 km) that convert sunlight into electricity. The artificial satellite 1 is configured to convert the electricity from the solar panels into microwaves (electromagnetic waves) 2 with a frequency of, for example, 2.45 GHz (wavelength λ=12.2 cm), 5.8 GHz (wavelength λ=5.17 cm), or 10 GHz (wavelength λ=3.0 cm), and to emit the microwaves from a transmitting antenna toward the ground with, for example, an energy pointing accuracy of approximately 1 urad.

[0019] Although the specific illustration of the artificial satellite 1 is omitted, it is equipped with a frequency conversion unit that converts DC power generated by the solar panel into AC power corresponding to the frequency of the electromagnetic waves, an electromagnetic wave control unit that controls the amplitude, frequency, and phase of the electromagnetic waves, and a transmitting antenna.

[0020] The energy intensity distribution of the electromagnetic waves transmitted from the artificial satellite 1 is not uniform, and may be a Gaussian distribution as shown in Figure 3a, or a distribution with a main distribution in the center and side lobes or grating lobes around it as shown in Figure 3b. Even with the same Gaussian distribution, the distribution shape may change due to weather conditions or other radio wave interference, and the power receiving system receives power based on this electromagnetic wave energy intensity distribution.

[0021] The configuration of the power receiving system 3 and a specific structural example of the power conversion device 4, which is a main component, will be described with reference to Fig. 4 and Fig. 5. Fig. 4 shows a block diagram of the power receiving system 3, and Fig. 5 is a perspective view showing a specific structural example of the power conversion device 4.

[0022] As shown in FIG. 4, the power receiving system 3 is composed of a plurality of power conversion devices 4 (for example, with a maximum dimension of approximately 50 m to 100 m), a plurality of power receiving stations 5, and an electric wire (or wireless power transmission system) 6, and the power conversion devices 4 and the power receiving stations 5 are electrically connected, and the received power can be supplied to a power grid 7 via the electric wire (or wireless power transmission system) 6.

[0023] As shown in FIG. 5, the power conversion device 4, which is a major component of the power receiving system 3, is composed of a rectenna 41, a control device 42, a positioning device 43, a propulsion or drive device 44, a storage battery 45, and a power supply device 46, and can be installed in any area, such as land, sea, air, or space.

[0024] This configuration allows the power conversion device 4 to be moved. In contrast, the power receiving station 5 can be either fixed or movable, but here we assume that it is fixed, and the moved power conversion device 4 is connected to the power receiving station 5 by a coupler to exchange power.

[0025] Although not shown, the rectenna 41 includes a receiving antenna and a rectifier circuit, and receives electromagnetic waves and converts them into DC power. The size of one rectenna 41 is, for example, approximately 2 m x 2 m, and as shown in FIG. 5, multiple rectennas 41 are arranged in an array. The receiving antenna may be, for example, a dipole antenna or a patch antenna. The control device 42 has the function of moving the power conversion device 4 to a desired position by controlling the propulsion device or drive device 44 based on information on the voltage and current values ​​obtained from the rectenna 41 and position information on the power conversion device 4 obtained from the positioning device 43.

[0026] Furthermore, although not shown in the figure, the control device 42 is equipped with an acceleration sensor, and stabilizes the attitude of the power conversion device 4 by controlling the propulsion device or drive device 44 based on attitude information obtained from the acceleration sensor.

[0027] The positioning device 43 (e.g., GNSS) is installed so as to accurately determine the position and orientation of the power conversion device 4, as shown in Figure 5, and constantly measures the placement of the power conversion device 4 and shares the measured position information with the control device 42.

[0028] The propulsion device or drive device 44 is controlled by the control device 42 and propels or drives the power conversion device 4 so that it is located at a desired position. This propulsion device or drive device 44 is configured to be able to move and rotate 360 ​​degrees around the central axis of the power conversion device 4, and for example, a screw, a water jet propulsion device, wheels, caterpillars, propellers, etc. are used.

[0029] Although not shown, the propulsion device and drive device 44 may be powered by, for example, electricity obtained from a storage battery 45, a gasoline engine, a diesel engine, or the like. The storage battery 45 stores the electricity received by the rectenna 41 and supplies the stored electricity to the control device 42, the positioning device 43, the propulsion device, or the drive device 44. Since the capacity of this storage battery 45 is expected to be large, it may be installed in multiple units as shown in FIG. 5.

[0030] The power supply device 46 is electrically connectable to the power receiving station 5 and has a structure that does not easily come off due to disturbances (for example, waves, earthquakes, wind, etc.). As a specific structural example, it is assumed that an electrical coupler that is commonly used in railway vehicles is employed.

[0031] Next, the flow of system processing in the power receiving system 3 will be described with reference to Fig. 6. Fig. 6 is a sequence diagram showing the flow of information and power within the power receiving system 3. Note that here, 4A and 4B are used as representative examples of multiple power electronics devices, and the processing within the power electronics device 4A will be described. The power electronics device 4B is configured and functions in the same way as 4A, but only the exchange between the power electronics devices is shown for the power electronics device 4B.

[0032] In all the power converters 4 in FIG. 6, the rectenna 41 supplies the received power to the control device 42 as indicated by 411 and 412, and also transmits information on the voltage and current values ​​of the rectenna 41 to the control device 42.

[0033] Next, as shown by 421 and 422, control device 42 distributes the power obtained from rectenna 41 and supplies it to storage battery 45 and power supply device 46. At this time, the amount of power distributed is based on information 451 about the remaining amount of storage battery obtained from storage battery 45 and information 701 about the required power requested from power grid 7.

[0034] In addition, the storage battery 45 supplies the stored power to the positioning device 43 and the propulsion device or drive device 44, as shown in 452 and 453, and further, as shown in 454, when the power conversion device 4 is located outside the electromagnetic wave irradiation range, it also supplies power to the control device 42.

[0035] The positioning device 43 supplied with power from the storage battery 45 constantly transmits the measured position information 431 to the control device. As shown in 423, the control device 42 shares the obtained position information 431 and information on the received power obtained from the voltage value and current value with the control devices 42 mounted on other power conversion devices 4, and based on this information, as shown in 424, the control device 42 controls the propulsion device or drive device 440 to place the power conversion device 4 at a desired position.

[0036] 7 and 8, an operation flowchart for when the power conversion device 4 fails or is repaired, and an example of the operation of the power conversion device 4 will be described. In the example of the arrangement of the power conversion devices 4 in Fig. 8, power is received in a planar manner by a total of seven power conversion devices 4 (4A-4g), with two, three, and two power conversion devices 4 (4A-4g) arranged from the top of the figure.

[0037] 7, the control device 42 acquires information on the voltage and current values ​​of each rectenna 41 when receiving power. Next, in processing step S912, the control device 42 compares the acquired information on the voltage and current values ​​with the ideal or calculated values ​​(FIGS. 3a and 3b) of the electromagnetic wave energy intensity distribution transmitted from the satellite 1, and determines that the rectenna 41 is faulty (No) if the current and voltage values ​​are not based on the electromagnetic wave energy intensity distribution, and does not perform the subsequent processing if no fault is detected (Yes).

[0038] If it is determined that a failure has occurred, in processing step S913, the control device 42 acquires position information of the power electronics device 4 from the positioning device 43, and as shown in processing step S914, the failure information and position information of each rectenna 41 are shared among all the control devices 42. Through this step, as shown in FIG. 8(a), the control device 42 determines the positions of the power electronics device 4 having the failed rectenna 41 and the power electronics device 4 that is functioning normally.

[0039] 8(a), it is assumed that an abnormality occurs in the power electronics device 4d located in the center, and that the device falls into a state in which repair is required. In this case, repair is performed in a safety zone 901 outside the power receiving area, and the power electronics device 4d will move to the safety zone 901 by itself, but since multiple power electronics devices 4 are placed as close as possible within the power receiving area for highly efficient power reception, a movement route cannot be secured.

[0040] Next, in processing step S915 of Figure 7, the control device 42 determines from the acquired information whether a normal power conversion device 4 is located on the route that the faulty power conversion device 4d will take to move to a safety zone 901 shown in (a) of Figure 8 (e.g., a location outside the electromagnetic wave irradiation range where repair and maintenance of the fault can be performed).

[0041] If a normal power conversion device 4f is located on this movement path R1, as shown in processing step S916 of Figure 7 and (b) of Figure 8, the control device 42f of the normal power conversion device 4f controls the propulsion device or drive device 44f to move the power conversion device 4f to a location that does not interfere with the movement of the faulty power conversion device 4d.

[0042] If there are no obstacles on the movement path of the faulty power conversion device 4, or if the movement path R1 is secured by the movement of the normal power conversion device 4f, the control device 42d of the faulty power conversion device 4d controls the propulsion device or drive device 44d to move the power conversion device to the safety zone 901, as shown in processing step S917 of Figure 7 and (c) of Figure 8.

[0043] Thereafter, in processing step S918 of Fig. 7, it is determined whether the normal power electronics device 4f is located outside the electromagnetic wave energy irradiation range, and if the normal power electronics device 4f is located outside the electromagnetic wave energy irradiation range, the control device 42f of the normal power electronics device 4f controls the propulsion device or drive device 44f to relocate the power electronics device 4f to its original position, as shown in processing step S919 of Fig. 7 and (d) of Fig. 8. Note that (d) of Fig. 8 shows an example of temporary operation with a six-unit configuration in which no new power electronics device 4 is placed in the position of the faulty power electronics device 4d, but this may also be followed by placing another power electronics device 4 in this position for full-scale operation with a seven-unit configuration.

[0044] The above configuration and operation have the effect of improving the power receiving efficiency of the entire power receiving system by realizing continuous power receiving as a power receiving system even when, for example, rectenna 41 is being repaired. [Example]

[0045] Next, a power receiving system 3 according to a second embodiment will be described with reference to Fig. 9 and Fig. 10. The system configuration is the same as that of the first embodiment (Figs. 1 to 6), and therefore, a duplicated description will be omitted. Fig. 9 and Fig. 10 are an operation flowchart and a schematic diagram of the power conversion device 4 that particularly describes the parts that are different from the first embodiment, and the configuration of the parts that are not shown and the flow of system processing are the same as those of the first embodiment.

[0046] This second embodiment is configured so that the power conversion device 4 can efficiently receive electromagnetic waves in accordance with the energy intensity distribution of the electromagnetic waves. An operation flowchart of the power conversion device 4 and an example of the operation of the power conversion device 4 will be described with reference to Figures 9 and 10. However, the description will be made assuming the arrangement of Figure 8(d) (where the power conversion device 4 is not arranged in the central position) as the initial state.

[0047] 9, the control device 42 calculates the received power of the power electronics device 4 (for example, W (received power) = V (voltage value) × I (current value)) from information on the voltage value and current value of each rectenna 41 during power reception. Furthermore, in processing step S922, the control device 42 acquires position information of the power electronics device 4 from the positioning device 43, and as shown in processing step S923, the received power information and position information are shared among all the control devices 42.

[0048] Based on this information, in processing step S924, the control device 42 determines the received power distribution 301 of the entire power receiving system 3 shown in (a) of Fig. 10. Next, in processing step S925 of Fig. 9, the control device 42 compares the received power distribution with the ideal value or calculated value of the electromagnetic wave energy intensity distribution (Figs. 3a and 3b).

[0049] 9 and (a) of Fig. 10, if no power electronics device 4 is located in a location 902 where the electromagnetic wave energy is relatively high, in processing step S927 of Fig. 9, the control device 42 controls the propulsion device or drive unit 44f of the power electronics device 4 (assumed to be 4f in this case) that has the lowest received power and is located closest to the location, and moves it to the location. Furthermore, although not shown, the arrangement or shape (for example, polygonal or circular) of the power electronics devices 4 may be changed in order to efficiently receive the electromagnetic waves 2.

[0050] The above configuration and operation enable the power receiving system 3 to efficiently receive electromagnetic waves, thereby improving the power receiving efficiency of the entire power receiving system. [Example]

[0051] Next, a power receiving system according to a third embodiment will be described with reference to Fig. 11 and Fig. 12. The system configuration is the same as that of the first embodiment (Figs. 1 to 6), so a duplicated description will be omitted. Fig. 11 and Fig. 12 are an operation flowchart of the power conversion device 4 and a schematic diagram thereof, which particularly explain the parts that are different from the first embodiment, and the configuration of the parts that are not shown and the flow of system processing are the same as those of the first embodiment.

[0052] In this third embodiment, the arrangement of the power conversion device 4 can be changed in order to level out the rate of deterioration of the power conversion device 4 caused by the energy intensity distribution of the electromagnetic waves. An operation flowchart of the power conversion device 4 and an example of the operation of the power conversion device 4 will be described with reference to Fig. 11 and Fig. 12.

[0053] First, in processing steps S931, S932, S933, and S934 of Figure 11, the control device 42 of each power conversion device 4 in the power receiving system 3 acquires the received power and location information of all power conversion devices 4, as in the operation flowchart of Example 2, and grasps the received power distribution 301 of the entire power receiving system 3 shown in (a) of Figure 12.

[0054] Next, in process step S935 of Fig. 11, the control device 42 compares the received power distribution with the ideal or calculated value of the electromagnetic wave energy intensity distribution (Figs. 3a and 3b). As shown in process step S936 and Fig. 12(a), if the power electronics device 4d placed in the location 902 (e.g., the center) where the electromagnetic wave energy intensity is the highest stays in the same location for a certain period of time (e.g., about one month), in process step S937 of Fig. 11, the control device 420 controls the propulsion devices or drive devices 44 to rotate the placement of all the power electronics devices 4.

[0055] 12(b), for example, this rotation can be achieved by moving the power electronics devices 4 one by one back and forth or left and right when viewed from above. Alternatively, the power electronics devices 4 may be divided into two types, that is, power electronics devices 4 with high received power and power electronics devices 4 with low received power, based on the received power value of each power electronics device 4, and their placement may be swapped so that the rate of deterioration of the power electronics devices 4 can be leveled. Furthermore, although not shown, a configuration may be adopted in which the size or shape of the power electronics devices 4 placed in a location 902 with high electromagnetic wave energy intensity where the power electronics devices 4 are expected to deteriorate quickly can be changed, thereby making it possible to easily rotate or replace the power electronics devices 4.

[0056] The above configuration and operation have the effect of leveling out the rate of deterioration of each power electronics device 4 and preventing early failure of the power electronics device 4, thereby improving the power receiving efficiency of the entire power receiving system. [Example]

[0057] Next, a power receiving system according to a fourth embodiment will be described with reference to Fig. 13 and Fig. 14. The basic system configuration is the same as that of the first embodiment (Figs. 1 to 6), so a duplicated description will be omitted. Fig. 13 and Fig. 14 are schematic diagrams of a space solar power generation system that particularly describes the parts that are different from the first embodiment, and the configuration of the parts that are not shown and the flow of system processing are the same as those of the first embodiment.

[0058] As shown in Figures 13 and 14, in this Example 4, the power conversion device 4 has a movement command receiving device 47 that can receive movement commands input from the outside (for example, a movement command device 8), and the movement command receiving device 470 transmits the received movement command to the control device 42, and the control device 42 is configured to control the propulsion device or drive device 44 based on the position information obtained from the positioning device 32 and the command transmitted from the movement command receiving device, thereby allowing the power conversion device 4 to move.

[0059] With the above configuration and operation, the power conversion device 4 can be moved to a desired location under any circumstances. For example, in the event of a natural disaster such as a typhoon or tsunami, the power conversion device 4 can be evacuated to a safe area in advance (for example, outside the typhoon's path in the case of a typhoon, or offshore in the case of a tsunami), thereby preventing failure of the power conversion device 4 due to a natural disaster and improving the power receiving efficiency of the entire power receiving system. [Explanation of symbols]

[0060] 1:Artificial satellite 2: Electromagnetic waves 3: Power receiving system 301: Received power distribution 4: Power conversion device 41: Rectenna 42: Control device 43: Positioning device 44: Propulsion and drive units 45: Storage battery 46:Power supply device 47: Movement command receiving device 411: Supply of received power 412: Voltage and current information 421: Power distribution (batteries) 422: Power distribution (power supply equipment) 423: Sharing of received power information and location information between control devices 424: Control of propulsion or drive devices based on voltage, current, and position information 431: Location information 451: Battery remaining capacity information 452: Power supply (positioning device) 453: Power supply (propulsion or drive) 454: Power supply (control device) 5: Power receiving station 6: Wired or wireless power transmission systems 7: Power grid 701: Power requirement information 8: Movement command device 901:Safety Zone 902: High electromagnetic energy areas

Claims

1. A power conversion device that receives electromagnetic waves transmitted from outer space and converts them into electric power, A power conversion device characterized by comprising: a power conversion unit that receives electromagnetic waves transmitted from outer space and converts them into electric power; a propulsion device or drive unit that moves the power conversion device; a positioning device that identifies the position of the power conversion device; a control device that controls the propulsion device or the drive unit based on information about the position and the electric power received by the power conversion unit; and a power supply device that supplies the electric power received by the power conversion unit to an electrical system.

2. The power conversion device according to claim 1, The power conversion device is characterized in that the control device controls the propulsion device or the drive device based on the energy intensity distribution of the electromagnetic waves and the position information.

3. The power conversion device according to claim 1, The power conversion device further comprises an abnormality detection unit that detects an abnormality based on information about the power received by the power conversion unit.

4. The power conversion device according to claim 1, The power conversion device is characterized in that the control device includes a movement command receiving device that receives a movement command from an external device.

5. A power receiving system comprising a plurality of power conversion devices according to claim 1 connected to a power grid via a power receiving station.

6. The power receiving system according to claim 5, A power receiving system, wherein a first power conversion device among the plurality of power conversion devices has a different shape from a second power conversion device.

7. The power receiving system according to claim 5, A power receiving system comprising a storage battery that stores the power received by the power conversion unit.

8. A control method for a power conversion device that receives electromagnetic waves transmitted from outer space and converts them into electric power, comprising: a power conversion unit that receives electromagnetic waves transmitted from outer space and converts them into electric power; a propulsion unit or a drive unit that moves the power conversion unit; a positioning device that identifies the position of the power conversion unit; a control unit that controls the propulsion unit or the drive unit based on information about the position and the electric power received by the power conversion unit; and a power supply unit that supplies the electric power received by the power conversion unit to an electrical system, The control method for a power conversion device, wherein the control device analyzes information obtained from the power conversion device and the positioning device, and changes the position of the power conversion device.

9. The control method for a power conversion device according to claim 8, The control method for a power conversion device, wherein the control device detects an abnormality from information on the received power of the power conversion unit and changes the position of the power conversion device.

10. The control method for a power conversion device according to claim 8, The control method for a power conversion device, wherein the control device analyzes an intensity distribution of the electromagnetic waves and changes a position of the power conversion device based on the analyzed intensity distribution of the electromagnetic waves.

11. The control method for a power conversion device according to claim 8, The control method for a power conversion device, wherein the control device analyzes the intensity distribution of the electromagnetic waves and the power receiving time, and changes the position of the power conversion device based on the analysis results.

12. A control method for a power receiving system in which a plurality of power conversion devices that receive electromagnetic waves transmitted from outer space and convert the waves into electric power are connected to a power grid via power receiving stations, the method comprising: Each power conversion device includes a power conversion unit that receives electromagnetic waves transmitted from outer space and converts them into electric power, a propulsion unit or a drive unit that moves the power conversion device, a positioning device that identifies the position of the power conversion device, a control device that controls the propulsion unit or the drive unit based on information about the position and the electric power received by the power conversion unit, and a power supply device that supplies the electric power received by the power conversion unit to an electrical system, A control method for a power receiving system, characterized in that the control device of each power conversion device analyzes information obtained from the power conversion device and the positioning device, and changes the position of the power conversion device.

13. The control method for a power receiving system according to claim 12, A control method for a power receiving system, comprising: executing a rotation to change positions of a plurality of power electronics devices using the control device of each power electronics device.

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