Control device, movable body, and control method

Abstract

To provide a control device and a control method, which can more satisfactorily control an electric power generation system equipped with a gas turbine engine and an electric power generator, and a movable body equipped with a control device.SOLUTION: A control device comprises: a first rotation speed acquisition unit that acquires a first rotation speed, which is the rotation speed of a gas turbine engine, on the basis of a signal supplied from a rotation speed sensor; a second rotation speed acquisition unit that acquires a second rotation speed, which is the rotation speed of an electric power generator, on the basis of a signal supplied from a rotation angle sensor; a comparison unit that compares the first rotation speed with the second rotation speed; and a control unit that controls the gas turbine engine and the electric power generator based on the lower of the first rotation speed and the second rotation speed, on the basis of the comparison result by the comparison unit.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a control device, a moving object, and a control method. [Background technology]

[0002] In recent years, research and development into electrification technologies that contribute to energy efficiency has been conducted to ensure that more people have access to affordable, reliable, sustainable and advanced energy.

[0003] Patent Document 1 discloses a gas turbine generator including a gas turbine engine equipped with a compressor and a generator driven by the gas turbine engine. In the technology of Patent Document 1, when the pressure of the compressor exceeds a reference value and the rotation speed of the generator exceeds a reference value, the fuel supplied to the gas turbine engine is cut off. In this way, the technology of Patent Document 1 prevents the gas turbine generator from overrunning. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 1-219322 Summary of the Invention [Problem to be solved by the invention]

[0005] It is desirable to provide a control device, a control method, and a mobile body equipped with a control device that can better control a power generation system including a gas turbine engine and a generator.

[0006] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0007] The control device of the present invention includes a first rotation speed acquisition unit that acquires a first rotation speed, which is the rotation speed of the gas turbine engine, based on a signal supplied from a rotation speed sensor provided in the gas turbine engine; a second rotation speed acquisition unit that acquires a second rotation speed, which is the rotation speed of the generator, based on a signal supplied from a rotation angle sensor provided in a generator rotated by the gas turbine engine; a comparison unit that compares the first rotation speed with the second rotation speed; and a control unit that controls the gas turbine engine and the generator based on the lower of the first rotation speed and the second rotation speed, based on the comparison result by the comparison unit.

[0008] A moving body of the present invention includes the above-described control device.

[0009] The control method of the present invention includes the steps of: acquiring a first rotation speed, which is the rotation speed of the gas turbine engine, based on a signal supplied from a rotation speed sensor provided in the gas turbine engine; acquiring a second rotation speed, which is the rotation speed of the generator, based on a signal supplied from a rotation angle sensor provided in a generator rotated by the gas turbine engine; comparing the first rotation speed with the second rotation speed; and controlling the gas turbine engine and the generator based on the lower of the first rotation speed and the second rotation speed, based on a result of the comparison between the first rotation speed and the second rotation speed. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a control device, a control method, and a mobile body equipped with a control device that can better control a power generation system. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram of a moving object. [Figure 2] FIG. 2 is a schematic diagram of a power generation system. [Figure 3] FIG. 3 is a functional block diagram of each ECU. [Figure 4] FIG. 4 is a flowchart of the processing performed by the management ECU. [Figure 5] FIG. 5 is a block diagram of the process performed by the setting unit. [Figure 6] FIG. 6 is a flowchart of the process performed by the engine ECU. [Figure 7] FIG. 7 is a flowchart of the process performed by the generator ECU. [Figure 8] FIG. 8 is a diagram showing the relationship between the rotation speed and torque of the power generating device. [Figure 9] FIG. 9 is a diagram showing the relationship between the rotation speed and torque of the power generating device. [Figure 10] FIG. 10 is a diagram showing the relationship between the rotation speed and torque of the power generating device. DETAILED DESCRIPTION OF THE INVENTION

[0012] [Mobile 10] FIG. 1 is a schematic diagram of a moving body 10. The moving body 10 includes an electric load. The moving body 10 according to the following embodiment is an electric vertical take-off and landing aircraft (eVTOL aircraft). Note that the moving body 10 may be an aircraft other than an eVTOL aircraft. Furthermore, the moving body 10 is not limited to an aircraft, and may also be a ship, automobile, train, etc.

[0013] The vehicle 10 includes eight VTOL rotors 12. The VTOL rotors 12 generate upward thrust for the airframe 14. The vehicle 10 includes eight electric motors 16. The electric motors 16 are electric loads. One electric motor 16 drives one VTOL rotor 12.

[0014] The moving body 10 has two cruise rotors 18. The cruise rotors 18 generate forward thrust for the airframe 14. The moving body 10 is equipped with four electric motors 20. The electric motors 20 are electric loads. Two electric motors 20 drive one cruise rotor 18.

[0015] The mobile object 10 includes a power generation system 22 including a power generation device 24. The mobile object 10 also includes a power storage device 26. The power storage device 26 is capable of storing a portion of the power generated by the power generation device 24. The power generation device 24 and the power storage device 26 are capable of supplying power to their respective electrical loads.

[0016] [Power Generation System 22] Fig. 2 is a schematic diagram of the power generation system 22. Fig. 3 is a functional block diagram of each ECU. The power generation system 22 operates to generate power requested by a controller (not shown) of the mobile object 10. The power generation system 22 includes a power generation device 24 and a control device 28. Note that, although the power generation system 22 is described here as being provided in the mobile object 10, the present invention is not limited to this. The power generation system 22 may also be provided in a facility, a factory, etc.

[0017] The power generation system 24 includes a gas turbine engine 30, a fuel injector 32, a generator 34, and a PCU (Power Control Unit) 36. A rotating shaft 30a of the gas turbine engine 30 and a rotating shaft 34a of the generator 34 are connected to each other. The gas turbine engine 30 rotates the generator 34. The fuel injector 32 includes an injector (not shown). The injector operates in response to an operation signal transmitted from the control device 28 to supply fuel to a combustor of the gas turbine engine 30. The generator 34 is rotated by the gas turbine engine 30 to generate three-phase AC power. The PCU 36 converts the three-phase AC power generated by the generator 34 into DC power. The PCU 36 includes an AC / DC converter 38. The AC / DC converter 38 includes multiple switching elements (not shown). The switching elements operate in response to an operation signal transmitted from the control device 28 to control the DC power supplied to the power storage device 26 and the electrical loads.

[0018] The power generation device 24 includes a rotation speed sensor 40 and a rotation angle sensor 42. The rotation speed sensor 40 is disposed near the rotation shaft 30a of the gas turbine engine 30. The rotation angle sensor 42 is disposed near the rotation shaft 34a of the generator 34.

[0019] The rotation speed sensor 40 detects the rotation speed of the gas turbine engine 30. The rotation speed sensor 40 transmits a digital signal indicating the rotation speed of the gas turbine engine 30 to the control device 28. For example, an electromagnetic pickup is used as the rotation speed sensor 40. In this specification, the rotation speed of the gas turbine engine 30 is also referred to as the ENG rotation speed (first rotation speed). "ENG" is an abbreviation for "engine."

[0020] The rotation angle sensor 42 detects the rotation angle of the generator 34. The rotation angle sensor 42 transmits an analog signal indicating the rotation angle of the generator 34 to the control device 28. A resolver, for example, is used as the rotation angle sensor 42. The rotation angle detected by the rotation angle sensor 42 is converted into a rotation speed by the control device 28. In this specification, the rotation speed of the generator 34 is also referred to as the GEN rotation speed (second rotation speed). "GEN" is an abbreviation for "generator."

[0021] The rotating shaft 30a of the gas turbine engine 30 is connected to the rotating shaft 34a of the generator 34 without any gears or the like. Therefore, the actual rotation speed of the gas turbine engine 30 is the same as the actual rotation speed of the generator 34. On the other hand, the ENG rotation speed detected by the rotation speed sensor 40 and the GEN rotation speed calculated from the rotation angle detected by the rotation angle sensor 42 may differ due to sensor failure, noise, etc.

[0022] The control device 28 includes a management ECU (Electronic Control Unit) 44 , an engine ECU 46 , a generator ECU 48 , and a conversion device 50 .

[0023] The management ECU 44, the generator ECU 48, and the engine ECU 46 are each connected to a CAN bus 52. The management ECU 44, the generator ECU 48, and the engine ECU 46 are each capable of communicating with each other via the CAN bus 52.

[0024] 3, each ECU includes a calculation unit and a storage unit. That is, the management ECU 44 includes a calculation unit 54 and a storage unit 56. The engine ECU 46 includes a calculation unit 58 and a storage unit 60. The generator ECU 48 includes a calculation unit 62 and a storage unit 64.

[0025] The arithmetic units 54, 58, 62 are processors such as a central processing unit (CPU) or a graphics processing unit (GPU). The arithmetic units 54, 58, 62 control each device by executing programs stored in the storage units 56, 60, 64. At least a portion of the arithmetic units 54, 58, 62 may be realized by an integrated circuit such as an application specific integrated circuit (ASIC) or a field-programmable gate array (FPGA). At least a portion of the arithmetic units 54, 58, 62 may be realized by an electronic circuit including discrete devices.

[0026] The storage units 56, 60, 64 are configured by volatile memory (not shown) and nonvolatile memory (not shown) which are computer-readable storage media. The volatile memory is, for example, RAM (Random Access Memory). The nonvolatile memory is, for example, ROM (Read Only Memory), flash memory, etc. Data, etc. are stored in the volatile memory. Programs, tables, maps, etc. are stored in the nonvolatile memory. At least a portion of the storage units 56, 60, 64 may be provided in the processor, integrated circuit, etc. described above.

[0027] The calculation unit 54 provided in the management ECU 44 functions as an acquisition unit 70, a setting unit 72, and a comparison unit 74. The acquisition unit 70 acquires various information from outside the calculation unit 54 or acquires various information through calculations, etc. The setting unit 72 sets an operation point. The operation point is a control target value of the power generation device 24. Information indicating the operation point includes a target rotation speed of the gas turbine engine 30 and a target torque value of the generator 34. The comparison unit 74 compares the ENG rotation speed recognized by the engine ECU 46 with the GEN rotation speed recognized by the generator ECU 48.

[0028] The calculation unit 58 provided in the engine ECU 46 functions as an acquisition unit 76 (first rotation speed acquisition unit), a normality determination unit 78, an estimation unit 80, and a control unit 82. The acquisition unit 76 acquires various information from outside the calculation unit 58 or acquires various information through calculations, etc. The normality determination unit 78 determines whether the rotation speed sensor 40 and the conversion device 50 are normal or abnormal. When an abnormality occurs in the rotation speed sensor 40, the estimation unit 80 estimates the ENG rotation speed based on the rotation angle detected by the rotation angle sensor 42. The control unit 82 controls the operation of the gas turbine engine 30 so that the rotation speed of the gas turbine engine 30 becomes a target rotation speed. Specifically, the control unit 82 controls the fuel injector 32 to adjust the amount of fuel supplied to the gas turbine engine 30.

[0029] The calculation unit 62 provided in the generator ECU 48 functions as an acquisition unit 84 (second rotation speed acquisition unit) and a control unit 86. The acquisition unit 84 acquires various pieces of information from outside the calculation unit 62 or by calculation or the like. The control unit 86 controls the operation of the generator 34 so that the torque value of the generator 34 becomes a target torque value. Specifically, the control unit 86 controls the AC / DC converter 38 to adjust the power generation current of the generator 34.

[0030] 2, the conversion device 50 converts the analog signal transmitted from the rotation angle sensor 42 into a digital signal. When the rotation angle sensor 42 is a resolver, an RD (resolver / digital) converter is used as the conversion device 50. The conversion device 50 transmits the converted digital signal to the engine ECU 46.

[0031] [Processing performed by Management ECU 44] Fig. 4 is a flowchart of the processing performed by the management ECU 44. The management ECU 44 performs processing related to management of the power generation device 24. The management ECU 44 repeatedly executes the series of processing shown in Fig. 4 while the power supply of the moving object 10 is on.

[0032] In step S1, the acquisition unit 70 provided in the management ECU 44 acquires the power requested by the controller of the moving body 10. This power is referred to as the requested power. The controller of the moving body 10 calculates the requested power in accordance with the operating states of the electrical devices provided in the moving body 10, the flight state of the moving body 10, the pilot's operation, etc. The controller of the moving body 10 transmits the calculated requested power to the management ECU 44. The acquisition unit 70 acquires this requested power.

[0033] In step S2, the setting unit 72 provided in the management ECU 44 sets an operation point based on the required power. The setting unit 72 can set the operation point by, for example, acquiring the required rotation speed and the required torque value by performing the processing shown in FIG. 5 . The setting unit 72 includes a conversion processing unit 90, a division processing unit 92, and a multiplication processing unit 94. The conversion processing unit 90 converts the required power into the required rotation speed using a map 88. The division processing unit 92 divides the required rotation speed acquired by the conversion processing unit 90 by the required power. The multiplication processing unit 94 calculates the required torque value by multiplying the divided value calculated by the division processing unit 92 by a conversion coefficient 96. The setting unit 72 sets the required rotation speed as the target rotation speed of the operation point. The setting unit 72 sets the required torque value as the target torque value of the operation point.

[0034] The map 88 used by the conversion processing unit 90 is stored in advance in the storage unit 56 provided in the management ECU 44. The map 88 associates electric power with rotation speed. A conversion coefficient 96 used by the multiplication processing unit 94 is also stored in advance in the storage unit 56. The conversion coefficient 96 is a coefficient for converting the divided value calculated by the division processing unit 92 into a torque value.

[0035] In step S3, the setting unit 72 transmits the target rotation speed to the engine ECU 46. As will be described with reference to Fig. 6, the engine ECU 46 (control unit 82) controls the operation of the gas turbine engine 30 based on the target rotation speed transmitted from the setting unit 72. The setting unit 72 also transmits a target torque value to the generator ECU 48. As will be described with reference to Fig. 7, the generator ECU 48 (control unit 86) controls the operation of the generator 34 based on the target torque value transmitted from the setting unit 72.

[0036] In step S4, the acquisition unit 70 acquires the ENG rotation speed transmitted from the engine ECU 46. The ENG rotation speed acquired here is the rotation speed of the gas turbine engine 30 recognized by the engine ECU 46. The acquisition unit 70 also acquires the GEN rotation speed transmitted from the generator ECU 48. The GEN rotation speed acquired here is the rotation speed of the generator 34 recognized by the generator ECU 48.

[0037] In step S5, the comparison unit 74 provided in the management ECU 44 compares the absolute value of the difference between the ENG rotation speed and the GEN rotation speed (|ENG rotation speed - GEN rotation speed|) with a rotation speed difference threshold. The rotation speed difference threshold is pre-stored in the storage unit 56. If the absolute value of the difference between the ENG rotation speed and the GEN rotation speed is equal to or greater than the rotation speed difference threshold (step S5: YES), the process proceeds to step S6. The absolute value of the difference between the ENG rotation speed and the GEN rotation speed being equal to or greater than the rotation speed difference threshold means that the difference between the ENG rotation speed recognized by the engine ECU 46 and the GEN rotation speed recognized by the generator ECU 48 is large. On the other hand, if the absolute value of the difference between the ENG rotation speed and the GEN rotation speed is less than the rotation speed difference threshold (step S5: NO), the process shown in FIG. 4 ends. The absolute value of the difference between the ENG rotation speed and the GEN rotation speed being less than the rotation speed difference threshold means that the difference between the ENG rotation speed recognized by the engine ECU 46 and the GEN rotation speed recognized by the generator ECU 48 is small.

[0038] When the process proceeds from step S5 to step S6, the setting unit 72 updates the operation point. The setting unit 72 sets the lower of the ENG rotation speed and the GEN rotation speed as the target rotation speed of the operation point. The setting unit 72 also acquires a torque value corresponding to the target rotation speed based on an operation point map (not shown) stored in advance in the memory unit 56. The setting unit 72 sets this torque value as the target torque value. The operation point map associates rotation speeds and torque values ​​at which the power generation device 24 can be operated most efficiently.

[0039] In step S7, the setting unit 72 transmits the target rotation speed to the engine ECU 46, similar to step S3. As a result, the engine ECU 46 controls the operation of the gas turbine engine 30 based on the updated target rotation speed. Also, as in step S3, the setting unit 72 transmits the target torque value to the generator ECU 48. As a result, the generator ECU 48 controls the operation of the generator 34 based on the updated target torque value.

[0040] [Processing performed by engine ECU 46] Fig. 6 is a flowchart of the processing performed by the engine ECU 46. The engine ECU 46 performs processing related to the control of the gas turbine engine 30. The engine ECU 46 repeatedly executes the series of processing shown in Fig. 6 while the power of the moving object 10 is on.

[0041] In step S11, the acquisition unit 76 provided in the engine ECU 46 acquires the target rotation speed set by the management ECU 44. Here, the acquisition unit 76 acquires the latest target rotation speed from among the target rotation speeds transmitted in step S3 or step S7 shown in FIG.

[0042] In step S12, the normality determination unit 78 provided in the engine ECU 46 determines whether the rotation speed sensor 40 is normal or abnormal. For example, if a digital signal is not transmitted from the rotation speed sensor 40 even though the gas turbine engine 30 is operating, the normality determination unit 78 determines that the rotation speed sensor 40 is abnormal. Furthermore, if the rotation speed indicated by the digital signal is not within a predetermined normal range, the normality determination unit 78 determines that the rotation speed sensor 40 is abnormal. If all of these determinations indicate that the rotation speed sensor 40 is normal (step S12: YES), the process proceeds to step S13. On the other hand, if any of these determinations indicate that the rotation speed sensor 40 is abnormal, the normality determination unit 78 determines that the rotation speed sensor 40 is abnormal. In this case (step S12: NO), the process proceeds to step S14.

[0043] When the process proceeds from step S12 to step S13, the acquisition unit 76 acquires, as the ENG rotation speed, the rotation speed detected by the rotation speed sensor 40. As a result, the engine ECU 46 recognizes the ENG rotation speed.

[0044] When the process proceeds from step S12 to step S14, the normality determination unit 78 determines whether the conversion device 50 is normal or abnormal. Here, the normality determination unit 78 can make the determination using the same method as in step S12. If the conversion device 50 is normal in all of these determinations (step S14: YES), the process proceeds to step S15. On the other hand, if the conversion device 50 is not normal in any of these determinations, the normality determination unit 78 determines that the conversion device 50 is abnormal. In this case (step S14: NO), the process proceeds to step S16.

[0045] When the process proceeds from step S14 to step S15, the estimation unit 80 provided in the engine ECU 46 estimates the ENG rotation speed based on the information converted by the conversion device 50. Specifically, the estimation unit 80 converts the rotation angle converted into a digital signal by the conversion device 50 into a rotation speed. The estimation unit 80 sets the converted rotation speed as the ENG rotation speed. As a result, the engine ECU 46 recognizes the ENG rotation speed.

[0046] When the process proceeds from step S14 to step S16, the estimation unit 80 estimates the ENG rotation speed based on the GEN rotation speed acquired from the generator ECU 48. Specifically, the estimation unit 80 sets the GEN rotation speed as the ENG rotation speed. As a result, the engine ECU 46 recognizes the ENG rotation speed.

[0047] When the process proceeds from any one of step S13, step S15, and step S16 to step S17, the control unit 82 provided in the engine ECU 46 controls the operation of the gas turbine engine 30 so that the rotation speed of the gas turbine engine 30 becomes the target rotation speed. For example, the control unit 82 uses the ENG rotation speed recognized at that time to control the fuel injector 32 so that the rotation speed of the gas turbine engine 30 becomes the target rotation speed.

[0048] In step S18, the control unit 82 transmits the engine speed recognized at that time to the management ECU 44. The engine speed transmitted here is used in the determination process in step S5 of FIG.

[0049] [Processing performed by generator ECU 48] Fig. 7 is a flowchart of the processing performed by the generator ECU 48. The generator ECU 48 performs processing related to the control of the generator 34. The generator ECU 48 repeatedly executes the series of processing shown in Fig. 7 while the power supply of the moving object 10 is on.

[0050] In step S21, the acquisition unit 84 provided in the generator ECU 48 acquires the target torque value set by the management ECU 44. Here, the acquisition unit 84 acquires the latest target torque value from among the target torque values ​​transmitted in step S3 or step S7 shown in FIG.

[0051] In step S22, the acquisition unit 84 acquires the GEN rotation speed based on the rotation angle detected by the rotation angle sensor 42. For example, the acquisition unit 84 converts the rotation angle detected by the rotation angle sensor 42 into a rotation speed, and sets the converted rotation speed as the GEN rotation speed. As a result, the generator ECU 48 recognizes the GEN rotation speed.

[0052] In step S23, the control unit 86 provided in the generator ECU 48 controls the operation of the generator 34 so that the torque value of the generator 34 becomes the target torque value. For example, the control unit 86 uses the torque value corresponding to the GEN rotation speed recognized at that time and the target torque value to control the AC / DC converter 38 so that the torque value of the generator 34 becomes the target torque value.

[0053] In step S24, the control unit 86 transmits the GEN rotation speed recognized at that time to the management ECU 44. The GEN rotation speed transmitted here is used in the determination process in step S5 of FIG.

[0054] [Actions and effects of power generation system 22] 8 to 10 are diagrams showing the relationship between the rotation speed and torque of the power generation device 24. The power generation system 22 achieves unique effects by performing the processes of steps S4 to S7 in Fig. 4. To explain the unique effects of the power generation system 22, first, control when the processes of steps S4 to S7 in Fig. 4 are not performed will be described.

[0055] 8, operation control of gas turbine engine 30 when the processes of steps S4 to S7 in Fig. 4 are not performed will be described. Engine ECU 46 recognizes, for example, the rotation speed detected by rotation speed sensor 40 as the ENG rotation speed. Based on the recognized ENG rotation speed, engine ECU 46 controls the operation of gas turbine engine 30 so that the ENG rotation speed becomes a target rotation speed.

[0056] The ENG rotation speed detected by the rotation speed sensor 40 may differ from the actual rotation speed of the gas turbine engine 30 due to a malfunction, noise, or the like of the rotation speed sensor 40. For example, the ENG rotation speed detected by the rotation speed sensor 40 may be lower than the actual rotation speed of the gas turbine engine 30. In this case, as shown in FIG. 8 , the ENG rotation speed recognized by the engine ECU 46 will be lower than the actual rotation speed of the gas turbine engine 30. Furthermore, the ENG rotation speed recognized by the engine ECU 46 will be lower than the GEN rotation speed recognized by the generator ECU 48. In this case, the engine ECU 46 increases the rotation speed of the gas turbine engine 30. This may cause the gas turbine engine 30 to over-speed, and the actual rotation speed may exceed the rotation speed limit (rotation speed limit).

[0057] 9, operation control of the generator 34 when the processes of steps S4 to S7 in Fig. 4 are not performed will be described. The generator ECU 48 converts the rotation angle detected by the rotation angle sensor 42 into a rotation speed, and recognizes this rotation speed as the GEN rotation speed. Based on the torque value corresponding to the recognized GEN rotation speed, the generator ECU 48 controls the operation of the generator 34 so that the recognized torque value becomes a target torque value.

[0058] The rotation angle sensor 42, which transmits an analog signal, is less likely to malfunction than the rotation speed sensor 40, which transmits a digital signal. Therefore, the reliability of the rotation angle sensor 42 is higher than that of the rotation speed sensor 40. However, the rotation angle sensor 42 may also malfunction, experience noise, or experience other problems. For example, the GEN rotation speed detected by the rotation angle sensor 42 may be lower than the actual rotation speed of the generator 34. In this case, as shown in FIG. 9 , the GEN rotation speed recognized by the generator ECU 48 is lower than the actual rotation speed of the generator 34. Furthermore, the GEN rotation speed recognized by the generator ECU 48 is lower than the ENG rotation speed recognized by the engine ECU 46. In this case, the generator ECU 48 increases the torque value of the generator 34. This may cause the generator 34 to generate excessive torque, causing the actual torque value to exceed a limit (generator torque limit).

[0059] 10, a unique effect of the power generation system 22 when performing the processing of steps S4 to S7 in FIG. 4 will be described. In step S5, the comparison unit 74 provided in the management ECU 44 determines whether the absolute value of the difference between the ENG rotation speed recognized by the engine ECU 46 and the GEN rotation speed recognized by the generator ECU 48 is equal to or greater than the rotation speed difference threshold. If the difference between the ENG rotation speed and the GEN rotation speed is equal to or greater than the rotation speed difference threshold, the setting unit 72 provided in the management ECU 44 sets the lower of the ENG rotation speed and the GEN rotation speed as the target rotation speed of the updated operation point. Furthermore, the setting unit 72 acquires a torque value corresponding to the target rotation speed and sets this torque value as the target torque value of the updated operation point.

[0060] The power generation system 22 can prevent the event described using Fig. 8. That is, the power generation system 22 can prevent the gas turbine engine 30 from over-rotating even when the difference between the ENG rotation speed and the actual rotation speed (GEN rotation speed) becomes large. The power generation system 22 can also prevent the event described using Fig. 9. That is, the power generation system 22 can prevent the generator 34 from over-torque even when the difference between the GEN rotation speed and the actual rotation speed (ENG rotation speed) becomes large.

[0061] According to the power generation system 22, when the difference between the ENG rotation speed and the GEN rotation speed is equal to or greater than the rotation speed difference threshold, the operation point is updated, thereby preventing excessive restrictions on the control of the gas turbine engine 30 and the control of the generator 34.

[0062] In the power generation system 22, an estimation unit 80 provided in the engine ECU 46 estimates the ENG rotation speed in preparation for a case where a malfunction occurs in the rotation speed sensor 40. According to the power generation system 22, it is possible to improve redundancy.

[0063] [Note] In addition to the above disclosure, the following additional notes are also disclosed.

[0064] (Appendix 1) The control device (28) includes a first rotation speed acquisition unit (76) that acquires a first rotation speed, which is the rotation speed of the gas turbine engine (30), based on a signal supplied from a rotation speed sensor (40) provided in the gas turbine engine (30); a second rotation speed acquisition unit (84) that acquires a second rotation speed, which is the rotation speed of the generator (34) rotated by the gas turbine engine, based on a signal supplied from a rotation angle sensor (42) provided in the generator (34) rotated by the gas turbine engine; a comparison unit (74) that compares the first rotation speed with the second rotation speed; and control units (82, 86) that control the gas turbine engine and the generator based on the lower of the first rotation speed and the second rotation speed, based on the comparison result by the comparison unit.

[0065] With the above configuration, even if the difference between the ENG rotation speed and the actual rotation speed (GEN rotation speed) becomes large, it is possible to prevent the gas turbine engine from over-rotating. Furthermore, with the above configuration, even if the difference between the GEN rotation speed and the actual rotation speed (ENG rotation speed) becomes large, it is possible to prevent the generator from over-torque. As a result, with the above configuration, it is possible to provide a control device that can better control the power generation system.

[0066] (Appendix 2) In the control device described in Supplementary Note 1, the control unit may control the gas turbine engine and the generator based on the lower of the first rotation speed and the second rotation speed when the difference between the first rotation speed and the second rotation speed is equal to or greater than a rotation speed difference threshold.

[0067] According to the above configuration, it is possible to prevent excessive restrictions on the control of the gas turbine engine and the control of the generator, and as a result, it is possible to provide a control device that can better control the power generation system.

[0068] (Appendix 3) In the control device described in Supplementary Note 2, the control unit may control the gas turbine engine to achieve a target rotation speed obtained based on required power, and may control the generator to achieve a target torque value obtained based on the required power.

[0069] (Appendix 4) The control device according to any one of Supplementary Notes 1 to 3 may further include an estimation unit (80) that, when an abnormality occurs in the rotation speed sensor, estimates the first rotation speed based on the signal supplied from the rotation angle sensor.

[0070] According to the above configuration, redundancy can be improved.

[0071] (Appendix 5) In the control device described in Supplementary Note 1, the control unit may control the gas turbine engine using the lower of the first rotational speed and the second rotational speed as a target value for the gas turbine engine, and may control the generator using a torque value corresponding to the lower of the first rotational speed and the second rotational speed as a target torque value for the generator.

[0072] (Appendix 6) The moving body (10) is equipped with the control device described in any one of Supplementary Notes 1 to 5.

[0073] (Appendix 7) The control method includes the steps of: acquiring a first rotation speed, which is the rotation speed of the gas turbine engine, based on a signal supplied from a rotation speed sensor provided in the gas turbine engine; acquiring a second rotation speed, which is the rotation speed of the generator, based on a signal supplied from a rotation angle sensor provided in a generator rotated by the gas turbine engine; comparing the first rotation speed with the second rotation speed; and controlling the gas turbine engine and the generator based on the lower of the first rotation speed and the second rotation speed, based on a result of the comparison between the first rotation speed and the second rotation speed.

[0074] With the above configuration, even if the difference between the ENG rotation speed and the actual rotation speed (GEN rotation speed) becomes large, it is possible to prevent over-rotation of the gas turbine engine. Furthermore, with the above configuration, even if the difference between the GEN rotation speed and the actual rotation speed (ENG rotation speed) becomes large, it is possible to prevent over-torque of the generator. As a result, with the above configuration, it is possible to provide a control method that can better control the power generation system.

[0075] The present invention is not limited to the above disclosure, and various configurations can be adopted without departing from the gist of the present invention. [Explanation of symbols]

[0076] 10...Mobile object 30...Gas turbine engine 34... Generator 40... Rotational speed sensor 42...Rotation angle sensor 74...Comparator 76... Acquisition unit (first rotation speed acquisition unit) 80... Estimation unit 82, 86...Control unit 84...Acquisition unit (second rotation speed acquisition unit)

Claims

1. a first rotation speed acquisition unit that acquires a first rotation speed, which is a rotation speed of the gas turbine engine, based on a signal supplied from a rotation speed sensor provided in the gas turbine engine; a second rotation speed acquisition unit that acquires a second rotation speed, which is the rotation speed of the generator, based on a signal supplied from a rotation angle sensor provided in a generator rotated by the gas turbine engine; a comparison unit that compares the first rotation speed with the second rotation speed; a control unit that controls the gas turbine engine and the generator based on a lower rotation speed of the first rotation speed and the second rotation speed based on a comparison result by the comparison unit; A control device comprising:

2. 2. The control device according to claim 1, The control unit controls the gas turbine engine and the generator based on the lower of the first rotational speed and the second rotational speed when a difference between the first rotational speed and the second rotational speed is equal to or greater than a rotational speed difference threshold.

3. 3. The control device according to claim 2, The control unit controls the gas turbine engine to achieve a target rotation speed obtained based on the required power, and controls the generator to achieve a target torque value obtained based on the required power.

4. 2. The control device according to claim 1, a control device comprising: an estimation unit that estimates the first rotation speed based on the signal supplied from the rotation angle sensor when an abnormality occurs in the rotation speed sensor.

5. 2. The control device according to claim 1, The control unit controls the gas turbine engine by setting the lower of the first rotational speed and the second rotational speed as a target value for the gas turbine engine, and controls the generator by setting a torque value corresponding to the lower of the first rotational speed and the second rotational speed as a target torque value for the generator.

6. A moving object comprising the control device according to any one of claims 1 to 5.

7. acquiring a first rotation speed, which is a rotation speed of the gas turbine engine, based on a signal supplied from a rotation speed sensor provided in the gas turbine engine; acquiring a second rotation speed, which is a rotation speed of the generator, based on a signal supplied from a rotation angle sensor provided in a generator rotated by the gas turbine engine; comparing the first rotational speed with the second rotational speed; controlling the gas turbine engine and the generator based on a lower rotational speed of the first rotational speed and the second rotational speed based on a comparison result between the first rotational speed and the second rotational speed; A control method comprising:

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