Control device, mobile device, control method and program

Abstract

The present invention provides a control means that allows for suitable inspection of a shut-off valve. [Solution] The control device 60 includes a torque determination unit 78 that determines whether the power torque of the generator is less than a predetermined torque threshold after control to shut off the fuel supply has been performed, a stop state determination unit 80 that determines whether the gas turbine engine has reached a stopped state when the torque determination unit 78 determines that the power torque of the generator is less than the torque threshold, and an abnormality determination unit 82 that determines that there is an abnormality in the shut-off valve when the stop state determination unit determines that the gas turbine engine has not reached a stopped state.

Description

Technical Field

[0001] The present disclosure relates to a control device, a mobile object, a control method, and a program.

Background Art

[0002] Japanese Unexamined Patent Application Publication No. 2001-107750 discloses a control device for a gas turbine engine. This control device can operate a shutoff valve to cut off the supply of fuel to a fuel nozzle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] It is desired to suitably perform inspection of the shutoff valve.

[0005] The present disclosure aims to solve the above-described problem.

Means for Solving the Problem

[0006] A first aspect of the present disclosure is a control device provided in a power generation system comprising a generator, a gas turbine engine for driving the generator, and a power converter for converting AC power output from the generator into DC power, the control device comprising: a valve control unit capable of shutting off the supply of fuel to the gas turbine engine by controlling a shut-off valve; a torque determination unit that determines whether the power torque of the generator is less than a predetermined torque threshold after the control for shutting off the fuel supply has been performed; a stop state determination unit that determines whether the gas turbine engine has reached a stop state when the torque determination unit determines that the power torque of the generator is less than the torque threshold; and an abnormality determination unit that determines that there is an abnormality in the shut-off valve when the stop state determination unit determines that the gas turbine engine has not reached the stop state.

[0007] A second aspect of this disclosure is a mobile body comprising a power generation system equipped with the control device of the first aspect.

[0008] A third aspect of the present disclosure is a control method for a power generation system comprising a generator, a gas turbine engine for driving the generator, and a power converter for converting alternating current power output from the generator into direct current power, the control method comprising: a valve control step in which one or more processors can shut off the supply of fuel to the gas turbine engine by controlling a shut-off valve; a torque determination step in which, after the control for shutting off the fuel supply has been performed, one or more processors determine whether the power torque of the generator is less than a predetermined torque threshold; a stop state determination step in which, if the torque determination step determines that the power torque of the generator is less than the torque threshold, one or more processors determine whether the gas turbine engine has reached a stopped state; and an abnormality determination step in which, if the stop state determination step determines that the gas turbine engine has not reached the stopped state, one or more processors determine that there is an abnormality in the shut-off valve.

[0009] A fourth aspect of this disclosure is a program for causing a computer to execute the control method of the third aspect. [Effects of the Invention]

[0010] According to this disclosure, the shut-off valve can be suitably inspected. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a schematic diagram of the moving object. [Figure 2] Figure 2 is a schematic diagram of the power generation system. [Figure 3] Figure 3 is the circuit diagram of the PCU. [Figure 4] Figure 4 is a control block diagram of the control device. [Figure 5] Figure 5 is a flowchart of the inspection process for the shut-off valve. [Modes for carrying out the invention]

[0012] With the electrification of mobile vehicles, power generation systems that connect gas turbine engines and generators are being developed. Generally, a shut-off valve is provided in the fuel supply line to the gas turbine engine. When the shut-off valve is activated, the fuel supply to the gas turbine engine is cut off, and the gas turbine engine can be stopped.

[0013] When the mobile unit equipped with the power generation system is stopped, the shut-off valve is inspected. The shut-off valve inspection determines whether the gas turbine engine will stop correctly after the shut-off valve is activated. If the shut-off valve operates correctly, the fuel supply to the gas turbine engine is cut off. As the fuel supply is cut off, the rotational speed of the gas turbine engine's output shaft gradually decreases.

[0014] However, the generator may be operating even when the rotational speed of the gas turbine engine's output shaft is decreasing. If the generator's torque is high, it takes time for the rotation of the gas turbine engine's output shaft to stop even if the shut-off valve is activated. If the shut-off valve is inspected in this state, an accurate result cannot be obtained. This disclosure makes it possible to correctly inspect the shut-off valve.

[0015] [1 Mobile Unit 100] Figure 1 is a schematic diagram of the mobile unit 100. In one embodiment, the mobile unit 100 is an electric vertical take-off and landing (eVTOL) aircraft. The mobile unit 100 is equipped with eight VTOL rotors 102. The VTOL rotors 102 generate upward thrust relative to the airframe 104. The mobile unit 100 is equipped with eight electric motors 106. One electric motor 106 drives one VTOL rotor 102. The mobile unit 100 has two cruise rotors 108. The cruise rotors 108 generate forward thrust relative to the airframe 104. The mobile unit 100 is equipped with two electric motors 110. The two electric motors 110 drive one cruise rotor 108. The mobile unit 100 is equipped with one or more power generation systems 10. The mobile unit 100 is not limited to aircraft, but may be a ship, automobile, train, etc.

[0016] [2. Configuration of power generation system 10] Figure 2 is a schematic diagram of the power generation system 10. The power output from the power generation system 10 is supplied to the electric motors 106 and 110 shown in Figure 1.

[0017] The power generation system 10 includes a fuel supply unit 12. The fuel supply unit 12 includes a fuel pump 14 and a shut-off valve 16. The fuel pump 14 is connected to a combustor 28 provided in the gas turbine engine 20 via a fuel supply passage 18. The shut-off valve 16 is located in the fuel supply passage 18.

[0018] The fuel pump 14 is installed in a fuel tank (not shown). The fuel pump 14 is, for example, an electric pump. The fuel pump 14 can rotate in the forward direction and the reverse direction. By rotating in the forward direction, the fuel pump 14 sucks in fuel in the fuel tank and pressure-feeds the sucked fuel to the fuel supply passage 18. By rotating in the reverse direction, the fuel pump 14 recovers the fuel remaining in the fuel supply passage 18 and returns the recovered fuel into the fuel tank.

[0019] The shutoff valve 16 can open and close the fuel supply passage 18. By closing the fuel supply passage 18, the shutoff valve 16 blocks the flow of fuel in the fuel supply passage 18. The shutoff valve 16 can block the fuel supplied from the fuel pump 18 via the fuel supply passage 18 to the combustor 28 provided in the gas turbine engine 20.

[0020] The power generation system 10 includes a gas turbine engine 20 and a generator 22. The gas turbine engine 20 and the generator 22 constitute a power generation unit 24. The gas turbine engine 20 and the generator 22 are integrally formed. The gas turbine engine 20 includes a compressor 26, a combustor 28, and a turbine 30. The compressor 26 compresses sucked outside air and discharges the compressed air from an outlet 34. The combustor 28 burns a mixed gas of the air discharged from the outlet 34 of the compressor 26 and the fuel supplied from the fuel supply passage 18. The turbine 30 is rotated by high-temperature gas generated by combustion of the mixed gas. The output shaft 32 of the gas turbine engine 20 is connected to the rotor 36 of the generator 22 and penetrates through the generator 22. The generator 22 is a motor generator that can also function as an electric motor. The generator 22 outputs, for example, three-phase AC power.

[0021] The power generation system 10 includes a power control unit (power conversion device) 38. The power control unit 38 can function as an AC-DC converter and an inverter. In the present specification, the power control unit 38 is also referred to as PCU (Power Control Unit) 38. A terminal on the primary side of the PCU 38 is connected to an output terminal of the generator 22. A terminal on the secondary side of the PCU 38 is connected to a terminal of a load device (not shown), a terminal of a power storage device (not shown), and the like. The PCU 38 can convert three-phase AC power input from the primary side into DC power and output the DC power to the secondary side. In addition, the PCU 38 can convert DC power input from the secondary side into three-phase AC power and output the three-phase AC power to the primary side.

[0022] FIG. 3 is a circuit diagram of the PCU 38. The PCU 38 includes three power element units 40 corresponding to respective three-phase voltages output from the generator 22, and a smoothing capacitor 42. The configurations of the three power element units 40 are identical to each other.

[0023] The power element unit 40 includes an upper arm 44 and a lower arm 46. Each of the upper arm 44 and the lower arm 46 includes a switching element 48 and a diode 50. In the power element unit 40, the switching element 48 of the upper arm 44 and the switching element 48 of the lower arm 46 are connected in series with each other. A first end portion of the switching element 48 of the upper arm 44 is connected to a positive wiring of the PCU 38. A second end portion of the switching element 48 of the upper arm 44 and a first end portion of the switching element 48 of the lower arm 46 are connected to one of three-phase terminals of the generator 22. A second end portion of the switching element 48 of the lower arm 46 is connected to a negative wiring of the PCU 38. An anode of the diode 50 is connected to the second end portion of the switching element 48. A cathode of the diode 50 is connected to the first end portion of the switching element 48.

[0024] The power generation system 10 includes a current sensor 52, a rotational speed sensor 54, and a pressure sensor 56. The current sensor 52 detects the current flowing through one of the three wires 58 connecting the generator 22 and the PCU 38. The rotational speed sensor 54 is attached to the end of the generator 22. The rotational speed sensor 54 detects the rotational speed of the output shaft 32 of the gas turbine engine 20 that protrudes from the generator 22. The pressure sensor 56 detects the pressure at the outlet 34 of the compressor 26 provided in the gas turbine engine 20.

[0025] [3 Control device 60] The power generation system 10 includes a control device 60. Figure 4 is a control block diagram of the control device 60. The control device 60 is composed of, for example, an ECU (Electronic Control Unit).

[0026] The control device 60 includes a calculation unit 62, a storage unit 64, and a fuel pump driver 66. The calculation unit 62 is a processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit). The calculation unit 62 includes an acquisition unit 68, a timing unit 70, a pump control unit 72, a PCU control unit 74, a valve control unit 76, a torque determination unit 78, a stop state determination unit 80, and an abnormality determination unit 82. The acquisition unit 68, timing unit 70, pump control unit 72, PCU control unit 74, valve control unit 76, torque determination unit 78, stop state determination unit 80, and abnormality determination unit 82 are realized by the execution of a program stored in the storage unit 64 in the calculation unit 62. At least a portion of the acquisition unit 68, timing unit 70, pump control unit 72, PCU control unit 74, valve control unit 76, torque determination unit 78, stop state determination unit 80, and abnormality determination unit 82 may be implemented by integrated circuits such as ASICs (Application Specific Integrated Circuits) and FPGAs (Field-Programmable Gate Arrays). At least a portion of the acquisition unit 68, timing unit 70, pump control unit 72, PCU control unit 74, valve control unit 76, torque determination unit 78, stop state determination unit 80, and abnormality determination unit 82 may be implemented by electronic circuits including discrete devices.

[0027] The storage unit 64 is a computer-readable, non-transient, tangible storage medium. The storage unit 64 is composed of volatile memory (not shown) and non-volatile memory (not shown). The volatile memory is, for example, RAM (Random Access Memory). The non-volatile memory is, for example, ROM (Read Only Memory), flash memory, etc. Data is stored in the volatile memory, for example. Programs, tables, maps, etc. are stored in the non-volatile memory, for example. At least a part of the storage unit 64 may be provided in the processor, integrated circuit, etc. mentioned above.

[0028] The acquisition unit 68 acquires various types of information from outside the calculation unit 62. For example, the acquisition unit 68 acquires information indicating the current value from the current sensor 52. This information is called current information. The acquisition unit 68 acquires information indicating the rotational speed from the rotational speed sensor 54. This information is called rotational speed information. The acquisition unit 68 acquires information indicating the pressure value from the pressure sensor 56. This information is called pressure information. The timing unit 70 measures time.

[0029] The pump control unit 72 controls the operation of the fuel pump 14. The pump control unit 72 outputs a control signal to the fuel pump driver 66. The fuel pump driver 66 supplies power to the fuel pump 14 according to the control signal.

[0030] The PCU control unit 74 controls the switching of each switching element 48 provided in the PCU 38 by outputting control signals to each switching element 48. The switching control performed by the PCU control unit 74 can change the torque of the generator 22, and as a result, the power output from the generator 22 can be changed.

[0031] The valve control unit 76 controls the opening and closing of the shut-off valve 16 by outputting a control signal to the shut-off valve 16. The opening control of the shut-off valve 16 performed by the valve control unit 76 is for the purpose of connecting the fuel supply passage 18 connected to the fuel pump 14 and the fuel supply passage 18 connected to the gas turbine engine 20. The closing control of the shut-off valve 16 performed by the valve control unit 76 is for the purpose of cutting off the supply of fuel to the gas turbine engine 20.

[0032] The torque determination unit 78 determines whether the power torque of the generator 22 is less than a predetermined torque threshold after control is performed to shut off the fuel supply to the gas turbine engine 20. The stop state determination unit 80 determines whether the gas turbine engine 20 has reached a stop state if the torque determination unit 78 determines that the power torque of the generator 22 is less than the torque threshold. The abnormality determination unit 82 determines that there is an abnormality in the shut-off valve 16 if the stop state determination unit 80 determines that the gas turbine engine 20 has not reached a stop state.

[0033] [4. Inspection procedure for the shut-off valve 16] Figure 5 is a flowchart of the inspection process for the shut-off valve 16. The inspection process for the shut-off valve 16 is performed when the movement of the mobile body 100 is completed and the gas turbine engine 20 is stopped. Before the gas turbine engine 20 is stopped, it is idled. The state of the gas turbine engine 20 when it is idled is called the idle state. While the gas turbine engine 20 is idled, the calculation unit 62 performs the inspection process for the shut-off valve 16, which will be explained below.

[0034] In the inspection of the shut-off valve 16 described below, the calculation unit 62 determines whether or not there is a problem with the shut-off valve 16 based on the result of whether or not the gas turbine engine 20 comes to a stopped state after the shut-off valve 16 is activated.

[0035] In step S1, the PCU control unit 74 starts zero torque control. Zero torque control is a control mode in which each switching element 48 of the PCU 38 is controlled so that the torque of the generator 22 becomes zero. Specifically, it is a control mode in which the current component that contributes to torque (q-axis current) is controlled to become zero. By making the torque of the generator 22 zero, the torque of the output shaft 32 of the gas turbine engine 20 becomes zero.

[0036] In step S2, the valve control unit 76 performs fuel shut-off control. When the valve control unit 76 performs fuel shut-off control, a control signal is output to the shut-off valve 16. If the shut-off valve 16 is not malfunctioning, the shut-off valve 16 operates in accordance with the control signal. Here, the shut-off valve 16 operates to block the fuel supply passage 18, thereby interrupting the flow of fuel in the fuel supply passage 18.

[0037] Furthermore, when fuel shut-off control begins (when the shut-off valve 16 is activated), the timing unit 70 starts timing the elapsed time.

[0038] In step S3, the torque determination unit 78 compares the powering torque of the generator 22 with the torque threshold. The torque threshold is stored in the memory unit 64 beforehand. In step S3, the torque determination unit 78 compares the powering torque with the torque threshold for the following reasons.

[0039] In step S1, the PCU control unit 74 starts zero torque control, which should result in zero torque for the generator 22. However, due to misalignment of the switching elements 48 of the PCU 38, power torque may be generated in the generator 22. If the power torque is greater than a predetermined value (torque threshold), it will take a long time for the output shaft 32 of the gas turbine engine 20 to stop. If the shut-off valve 16 is inspected while a large power torque is generated in the generator 22, there is a risk of a false determination that "there is a problem with the shut-off valve 16" even though the shut-off valve 16 is functioning normally. In this embodiment, to prevent such a false determination, the shut-off valve 16 is not inspected when a power torque greater than the torque threshold is generated.

[0040] The torque determination unit 78 calculates the power torque of the generator 22 based on the current information acquired by the acquisition unit 68. If the power torque of the generator 22 is less than the torque threshold (step S3: YES), the process proceeds to step S5. On the other hand, if the power torque of the generator 22 is equal to or greater than the torque threshold (step S3: NO), the process proceeds to step S4.

[0041] When the generator 22 is operating, the rate of decrease in the rotational speed of the gas turbine engine 20 and the generator 22 is low. Therefore, there is a risk that the inspection of the shut-off valve 16 may not be completed even after a predetermined time (described later) has elapsed since the start of the inspection. As in step S3, by deciding whether or not to continue the inspection based on the operating torque, the inspection of the shut-off valve 16 can be completed within the predetermined time.

[0042] When the process moves from step S3 to step S4, the abnormality detection unit 82 stops inspecting the shut-off valve 16. As a result, the shut-off valve 16 is not inspected when the mobile body 100 is stopped this time. The shut-off valve 16 will be inspected the next time the mobile body 100 is stopped.

[0043] When the process moves from step S3 to step S5, the timing unit 70 determines whether a predetermined time has elapsed. The predetermined time is the time required from the time fuel cut-off control is performed until the gas turbine engine 20 reaches a predetermined stop state. The predetermined time is predetermined and stored in the storage unit 64. The predetermined stop state is set as the determination condition for the next step S6. If the predetermined time has elapsed since the fuel cut-off control was performed (step S5: YES), the process moves to step S8. On the other hand, if the predetermined time has not elapsed since the fuel cut-off control was performed (step S5: NO), the process moves to step S6.

[0044] When the system moves from step S5 to step S6, the stop state determination unit 80 determines whether the gas turbine engine 20 has reached a stop state. The stop state may be a state of complete stop or a state in the process of reaching a complete stop. Whether the gas turbine engine 20 has reached a stop state can be determined by the rotational speed of the output shaft 32 of the gas turbine engine 20 or the pressure at the outlet 34 of the compressor 26. If the stop state means a state of complete stop, the rotational speed is zero and the pressure is atmospheric pressure. If the stop state means a state in the process of reaching a complete stop, the rotational speed is the rotational speed corresponding to a predetermined time and the pressure is the pressure corresponding to a predetermined time.

[0045] For example, the stop state determination unit 80 acquires the rotational speed of the output shaft 32 of the gas turbine engine 20 based on the rotational speed information acquired by the acquisition unit 68. The stop state determination unit 80 compares the rotational speed of the output shaft 32 of the gas turbine engine 20 with a rotational speed threshold. The rotational speed threshold is stored in advance in the storage unit 64.

[0046] Alternatively, the stop state determination unit 80 obtains the pressure at the outlet 34 of the compressor 26 based on the pressure information obtained by the acquisition unit 68. The stop state determination unit 80 compares the pressure at the outlet 34 of the compressor 26 with a pressure threshold. The pressure threshold is stored in advance in the storage unit 64.

[0047] If the rotational speed is below the rotational speed threshold, or if the pressure is below the pressure threshold (step S6: YES), the process proceeds to step S7. In this case, the gas turbine engine 20 has reached a stopped state. On the other hand, if the rotational speed is equal to or greater than the rotational speed threshold, and the pressure is equal to or greater than the pressure threshold (step S6: NO), the process returns to step S5. In this case, the gas turbine engine 20 has not reached a stopped state.

[0048] In step S6, it is also possible to determine whether the gas turbine engine 20 has reached a stopped state based on both the rotational speed of the output shaft 32 of the gas turbine engine 20 and the pressure at the outlet 34 of the compressor 26.

[0049] When the system moves from step S6 to step S7, the abnormality determination unit 82 determines that "there is no abnormality in the shut-off valve 16." The abnormality determination unit 82 transmits the determination result (inspection result) to an external device, the control device 60. For example, the abnormality determination unit 82 may transmit information indicating the determination result to a central control device (not shown) that comprehensively controls the operation of the mobile body 100. Alternatively, the abnormality determination unit 82 may transmit information indicating the determination result to an external server (not shown) that manages maintenance information for the mobile body 100. Alternatively, the abnormality determination unit 82 may transmit information indicating the determination result to a user's mobile terminal (not shown). Alternatively, the abnormality determination unit 82 may transmit information indicating the determination result to a display device (not shown). The display device displays the determination result.

[0050] When the system moves from step S5 to step S8, the abnormality detection unit 82 determines that "there is an abnormality in the shut-off valve 16." Similar to step S7, the abnormality detection unit 82 transmits the determination result (inspection result) to the outside of the control device 60.

[0051] When the process moves from step S4, step S7, or step S8 to step S9, the valve control unit 76 operates the shut-off valve 16 in the opposite direction to that of step S2. The shut-off valve 16 operates to open the fuel supply passage 18, allowing fuel to flow through it. Next, the pump control unit 72 rotates the fuel pump 14 in the opposite direction to normal to recover any remaining fuel in the fuel supply passage 18. This completes the inspection process for the shut-off valve 16.

[0052] In the above embodiment, a determination is made as to whether or not there is an abnormality in the shut-off valve 16 when the power torque is less than the torque threshold. According to the above embodiment, the number of cases in which the shut-off valve 16 is incorrectly determined to be "abnormal" due to power torque is reduced during inspection of the shut-off valve 16. According to the above embodiment, a decrease in the inspection accuracy of the shut-off valve 16 can be suppressed.

[0053] According to the above embodiment, since the fuel remaining in the fuel supply passage 18 is recovered after the inspection of the shut-off valve 16 is completed, problems caused by fuel remaining in the fuel supply passage 18 can be suppressed.

[0054] According to the above embodiment, inspection of the shut-off valve 16 and stopping of the gas turbine engine 20 can be performed seamlessly.

[0055] [5 Variations] In the above embodiment, the predetermined time used in step S5 is the time required from when fuel shut-off control is performed until the gas turbine engine 20 reaches a predetermined stop state. Note that the predetermined time may be a different time. For example, as will be explained below, the predetermined time may be a time that can suppress fuel leakage from the fuel supply passage 18.

[0056] From the time the shut-off valve 16 is closed until the fuel is recovered, any fuel remaining in the fuel supply passage 18 (nozzle) connected to the combustor 28 of the gas turbine engine 20 leaks into the combustor 28 due to gravity. For a while after the gas turbine engine 20 stops, the pressure inside the combustor 28 (compressor outlet pressure) is high, so no fuel leaks from the fuel supply passage 18. On the other hand, once the gas turbine engine 20 has completely stopped and the pressure inside the combustor 28 has dropped, it becomes impossible to prevent fuel leakage. If the inspection of the shut-off valve 16 and fuel recovery can be completed within a predetermined time, fuel can be recovered from the fuel supply passage 18 while the pressure inside the combustor 28 is still high. If the time required from the time the fuel shut-off control is performed until the gas turbine engine 20 reaches a predetermined stop state is shorter than the time it takes for the fuel remaining in the fuel supply passage 18 (nozzle) to leak into the combustor 28 due to gravity, then the effect of suppressing fuel leakage into the fuel supply passage 18 can also be obtained.

[0057] Furthermore, the inspection of the shut-off valve 16 may be performed at a time other than when the mobile body 100 is stopped. For example, the gas turbine engine 20 may be stopped even while the mobile body 100 is moving. The inspection of the shut-off valve 16 may be performed at this time.

[0058] [6 Note] The following additional information is disclosed regarding the above embodiment.

[0059] (Note 1) The control device (60) of this disclosure is a control device provided in a power generation system (10) comprising a generator (22), a gas turbine engine (20) that drives the generator, and a power converter (38) that converts AC power output from the generator into DC power, and comprises: a valve control unit (76) that can shut off the supply of fuel to the gas turbine engine by controlling a shut-off valve (16); a torque determination unit (78) that determines whether the power torque of the generator is less than a predetermined torque threshold after the control for shutting off the fuel supply has been performed; a stop state determination unit (80) that determines whether the gas turbine engine has reached a stop state when the torque determination unit determines that the power torque of the generator is less than the torque threshold; and an abnormality determination unit (82) that determines that there is an abnormality in the shut-off valve when the stop state determination unit determines that the gas turbine engine has not reached the stop state.

[0060] In the above configuration, a determination is made as to whether or not there is a problem with the shut-off valve when the power torque is below the torque threshold. With the above configuration, the number of cases in which a "shut-off valve is abnormal" is incorrectly determined due to power torque during shut-off valve inspection is reduced. With the above configuration, a decrease in the inspection accuracy of the shut-off valve can be suppressed. With the above configuration, the number of times the shut-off valve needs to be replaced is reduced, thus reducing the maintenance time and cost of the gas turbine engine.

[0061] (Note 2) In the control device described in Appendix 1, the stop state determination unit may determine that the gas turbine engine has not reached the stop state if the gas turbine engine does not reach the stop state for a predetermined period of time or longer.

[0062] (Note 3) In the control device described in Appendix 1, the stop state determination unit may determine that the gas turbine engine is in the stop state if the rotational speed of the gas turbine engine is less than a predetermined rotational speed threshold, or if the pressure at the outlet (34) of the compressor (26) provided in the gas turbine engine is less than a predetermined pressure threshold.

[0063] (Note 4) In the control device described in Appendix 1, if the torque determination unit determines that the power torque of the generator is equal to or greater than the torque threshold, the abnormality determination unit may discontinue determining whether or not the shut-off valve is abnormal.

[0064] When the generator is operating under power, the rate of decrease in the rotational speed of the gas turbine engine and the generator is low. Therefore, there is a risk that the shut-off valve inspection may not be completed even after a predetermined time has elapsed since the start of the inspection. As described above, by determining whether to continue the inspection based on the power torque, the shut-off valve inspection can be completed within a predetermined time.

[0065] (Note 5) The control device described in Appendix 1 includes a pump control unit (72) that controls a fuel pump (14) which pumps fuel to the gas turbine engine side by rotating in the forward direction and recovers fuel from the gas turbine engine side by rotating in the reverse direction, and after determining whether or not there is an abnormality in the shut-off valve, the pump control unit may rotate the fuel pump in the reverse direction.

[0066] According to the above configuration, since the fuel remaining in the fuel supply line is recovered after the shut-off valve inspection is completed, malfunctions caused by fuel remaining in the fuel supply line can be suppressed.

[0067] (Note 6) In the control device described in Appendix 1, a power conversion control unit (74) for controlling the power converter is provided, and when the gas turbine engine is idling and the power conversion control unit is controlling the power converter to make the DC power output from the power converter zero, the valve control unit may cut off the supply of fuel to the gas turbine engine by controlling the shut-off valve.

[0068] With the above configuration, inspection of the shut-off valve and shutdown of the gas turbine engine can be performed seamlessly.

[0069] (Note 7) The mobile body (100) of this disclosure comprises a power generation system equipped with a control device described in any one of the appendices 1 to 6.

[0070] (Note 8) The control method of the present disclosure is a control method for a power generation system comprising a generator, a gas turbine engine that drives the generator, and a power converter that converts AC power output from the generator into DC power, comprising: a valve control step (step S2) in which one or more processors can shut off the supply of fuel to the gas turbine engine by controlling a shut-off valve; a torque determination step (step S3) in which, after the control for shutting off the fuel supply has been performed, one or more processors determine whether or not the power torque of the generator is less than a predetermined torque threshold; a stop state determination step (step S6) in which, if the torque determination step determines that the power torque of the generator is less than the torque threshold, one or more processors determine whether or not the gas turbine engine has reached a stop state; and an abnormality determination step (step S8) in which, if the stop state determination step determines that the gas turbine engine has not reached the stop state, one or more processors determine that there is an abnormality in the shut-off valve.

[0071] (Note 9) The program disclosed herein causes a computer to execute the control method described in Appendix 8.

[0072] While this disclosure has been described in detail, it is not limited to the individual embodiments described above. These embodiments can be added, replaced, modified, partially deleted, etc., in any way that does not depart from the gist of this disclosure or from the intent of this disclosure derived from the claims and their equivalents. These embodiments can also be implemented in combination. For example, the order of operations and processes in the embodiments described above are given as examples only and are not limited thereto. The same applies when numerical values ​​or mathematical formulas are used in the description of the embodiments described above. [Explanation of symbols]

[0073] 10...Power generation system 14...Fuel pump 16…Shut-off valve 20…Gas turbine engine 22...Generator 26...Compressor 28... Combustor 34... Outlet 38…Power control unit, PCU (Power Conversion Unit) 60...Control device 72...Pump control unit 74...PCU control unit (power conversion control unit) 76...Valve control unit 78... Torque determination unit 80... Stop state determination unit 82...Abnormality determination unit 100...Moving object

Claims

1. A control device provided in a power generation system comprising a generator, a gas turbine engine that drives the generator, and a power conversion device that converts AC power output from the generator into DC power, A valve control unit that can shut off the supply of fuel to the gas turbine engine by controlling a shut-off valve, After the control for shutting off the fuel supply is performed, a torque determination unit determines whether or not the power torque of the generator is less than a predetermined torque threshold, When the torque determination unit determines that the power torque of the generator is less than the torque threshold, a stop state determination unit determines whether or not the gas turbine engine has reached a stop state, If the stop state determination unit determines that the gas turbine engine did not reach the stop state, the abnormality determination unit determines that there is an abnormality in the shut-off valve, A control device equipped with the following features.

2. In the control device according to claim 1, The stop state determination unit is a control device that determines that the gas turbine engine has not reached the stop state if the gas turbine engine does not reach the stop state for a predetermined period of time or longer.

3. In the control device according to claim 1, The stop state determination unit is a control device that determines that the gas turbine engine is in the stop state when the rotational speed of the gas turbine engine is less than a predetermined rotational speed threshold, or when the pressure at the outlet of the compressor provided in the gas turbine engine is less than a predetermined pressure threshold.

4. In the control device according to claim 1, A control device in which, when the torque determination unit determines that the power torque of the generator is equal to or greater than the torque threshold, the abnormality determination unit stops determining whether or not the shut-off valve is abnormal.

5. In the control device according to claim 1, The system includes a pump control unit that controls a fuel pump that pressurizes fuel to the gas turbine engine by rotating in the forward direction and recovers fuel from the gas turbine engine by rotating in the reverse direction. After determining whether or not there is an abnormality in the shut-off valve, the pump control unit reverses the rotation of the fuel pump.

6. In the control device according to claim 1, The power conversion control unit controls the aforementioned power conversion device, A control device in which, when the gas turbine engine is idling and the power conversion control unit is controlling the power conversion device to reduce the DC power output from the power conversion device to zero, the valve control unit cuts off the supply of fuel to the gas turbine engine by controlling the shut-off valve.

7. A mobile body comprising a power generation system equipped with a control device according to any one of claims 1 to 6.

8. A control method for a power generation system comprising a generator, a gas turbine engine that drives the generator, and a power conversion device that converts AC power output from the generator into DC power, A valve control step in which the supply of fuel to the gas turbine engine can be shut off by one or more processors controlling a shut-off valve, After the control for shutting off the fuel supply is performed, one or more processors determine whether the power torque of the generator is less than a predetermined torque threshold, If the torque determination step determines that the power torque of the generator is less than the torque threshold, one or more processors determine whether the gas turbine engine has reached a stopped state. If the stop state determination step determines that the gas turbine engine did not reach the stop state, then the abnormality determination step determines that one or more processors determine that there is an abnormality in the shut-off valve, A control method comprising:

9. A program for causing a computer to execute the control method described in claim 8.

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