Range-extended power generation device control system and control method thereof

Abstract

The invention relates to a range-extended power generation device control system and a control method thereof.The range-extended power generation device control system comprises a range-extended engine, a bearingless generator, a controller, a rectifier, an inverter, a first switch, a synchronous controller and a second switch, the controller is electrically connected with the first switch, and the engine is electrically connected with the controller; the rectifier is electrically connected with the generator, the controller and the inverter, the inverter is electrically connected with the synchronous controller, and the synchronous controller is electrically connected with the second switch. Aiming at the miniaturization requirement, the engine, the rectifier, the inverter, the synchronous controller and the like can be accurately controlled, and a control method for parallel operation, grid connection and parallel operation and grid connection is realized; the functions of power frequency power generation, parallel operation capacity expansion on-load, grid-connected uninterrupted power supply and the like are achieved.

Description

Technical Field

[0001] The present invention relates to the field of intelligent control of power generation devices, and particularly to a control system and a control method for an extended-range power generation device. Background Art

[0002] In order to significantly improve power supply reliability, power grid companies are actively expanding the application of mobile power equipment in the field of live maintenance, especially in medium and low voltage distribution grids. Currently, large medium voltage mobile power generation equipment is widely favored due to its high efficiency and is applicable to a wide range of scenarios such as regional power grids. However, in the face of special environments such as narrow urban streets and underground spaces, these high-power devices are unable to perform effectively and are difficult to enter and play their roles.

[0003] To meet the urgent needs of customers for emergency power supply and live maintenance in small spaces, equipment manufacturers are actively investing in research and development efforts to develop emergency power supply equipment with miniaturization and high power density. These new devices aim to overcome the limitations of existing high-power mobile power sources in terms of volume and flexibility, and with a more lightweight and compact design, meet the power supply requirements in complex environments, ensuring stable and reliable power support under various extreme conditions, and further promoting the refinement and intelligent development of power services. Summary of the Invention

[0004] To solve the above problems, the present invention proposes a control system and a control method for an extended-range power generation device, aiming to achieve coordinated control of the engine, rectifier, inverter, and synchronization controller, and realize functions such as power generation output at industrial frequency, parallel operation for capacity expansion and load carrying, and grid-connected uninterrupted power supply.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A control system for an extended-range power generation device includes an extended-range engine, a bearingless generator, a controller, a rectifier, an inverter, switch one, a synchronization controller, and switch two. The controller is electrically connected to switch one, the engine is electrically connected to the controller, the rectifier is electrically connected to the generator, the controller, and the inverter respectively, the inverter is electrically connected to the synchronization controller, and the synchronization controller is electrically connected to switch two.

[0006] Further, the control system further includes a display, the display is electrically connected to the controller, and the display completes the start and stop of the engine and adjusts the output power of the inverter through the controller.

[0007] Further, the display, the controller, the engine, the generator, the rectifier, the inverter, and the synchronization controller are connected through a CAN bus.

[0008] A grid-connected mode control method is disclosed, which is based on the control system of a range-extended power generation device. The specific steps are as follows: S1. Connect switch one to the grid load, and at the same time connect switch two to the grid power supply; S2. The display controls switch one to close through the controller. After switch one closes, the controller instructs the range-extended engine to start and adjusts its speed to a predetermined value; S3. After the range-extended engine reaches the predetermined value, the controller automatically controls the rectifier to start working to ensure that the bearingless generator outputs direct current meeting the voltage requirements. When the DC voltage reaches the set standard, the controller intervenes again to automatically control the inverter to start and perform synchronous grid connection operation; S4. After successful grid connection, adjust the output power of the inverter through the display to match the actual power demand of the grid. Then disconnect the online switch to completely transfer the grid load into this control system. At this time, the grid power supply is cut off for maintenance, without affecting the normal power supply of the load; S5. When the grid power supply is repaired and re-energized, adjust the output parameters of the inverter again through the display according to the current state of the grid power supply, and use the synchronous controller for fine synchronous adjustment. The synchronous controller will monitor and adjust the output of the inverter in real time to ensure that it is consistent with the voltage, frequency and phase of the grid; S6. After reaching the synchronous condition, the synchronous controller controls switch two to close to achieve re-grid connection. Then, close the online switch to transfer the load from the control system to the grid; S7. Set the output power of the inverter to 0 through the display, and control the control system to shut down step by step through the display and the controller. The whole process realizes uninterrupted power supply and ensures the stable operation of the grid and the load.

[0009] A parallel operation mode control method is also disclosed, which is based on the control system of a range-extended power generation device. The number of such control systems is more than two groups. The specific steps are as follows: S1. Connect the switch one of multiple groups of control systems to the start-up main switch, the start-up main switch is connected to the grid load, and connect the controllers in multiple groups of control systems; S2. Start the first group of control systems so that the first group of control systems outputs industrial frequency alternating current; S3. Close the switch one of multiple groups of control systems; S4. Start the second group of control systems so that the second group of control systems outputs industrial frequency alternating current; S5. When the first group of control systems and the second group of control systems reach the synchronous condition, perform synchronous parallel operation, and the parallel operation is completed; S6. Close the start-up main switch, and the inverters of multiple groups of control systems perform load distribution. The load distribution is automatically proportionally distributed according to the respective capacities of the inverters.

[0010] Further, the starting methods involved in steps S2 and S4 of the parallel operation mode control method are the same, and step S2 or S4 is specifically as follows: S201. The operation display controls the start of the range extender engine through the controller and adjusts its speed to a predetermined value; S202. After the range extender engine reaches the predetermined value, the controller automatically controls the rectifier to start working to ensure that the bearingless generator outputs direct current meeting the voltage requirements; S203. When the DC voltage reaches the set standard, the controller intervenes again to automatically control the inverter to start outputting industrial frequency alternating current.

[0011] A parallel operation and grid connection mode control method is also disclosed, which is based on a range extender power generation device control system, and the number of such control systems is more than two groups. The specific steps are as follows: S1. Connect the switch one of multiple groups of control systems to the grid load, connect the switch two of multiple groups of control systems to the grid power supply, and connect the controllers within multiple groups of control systems; S2. Start the first group of control systems so that the first group of control systems outputs industrial frequency alternating current; S3. Close the switch one of multiple groups of control systems; S4. Start the second group of control systems so that the second group of control systems outputs industrial frequency alternating current; S5. When the first group of control systems and the second group of control systems reach the synchronization condition, perform synchronous parallel operation, and the parallel operation is completed; S6. According to the actual power consumption demand and the grid load condition, reasonably set the output load of multiple groups of control systems, and the inverters of multiple groups of control systems perform load distribution, and the load distribution is automatically proportionally distributed according to the respective capacities of the inverters; S7. Disconnect the online switch and completely transfer the grid load into multiple groups of control systems; S8. Re-energize, adjust the inverter through the synchronization controller, and multiple groups of control systems are connected to the grid; S9. After reaching the synchronization condition, the controller controls the switch two to close and transfers the load from multiple groups of control systems to the grid; S10. Set the output power of the inverter to 0 through the display, and the display and the controller control multiple groups of control systems to gradually shut down, and close the online switch.

[0012] Specifically, the starting methods involved in steps S2 and S4 of the parallel operation and grid connection mode control method are the same, and step S2 or S4 is specifically as follows: S401. The operation display controls the start of the range extender engine through the controller and adjusts its speed to a predetermined value; S402. After the range extender engine reaches the predetermined value, the controller automatically controls the rectifier to start working to ensure that the bearingless generator outputs direct current that meets the voltage requirements; S403. When the DC voltage reaches the set standard, the controller intervenes again to automatically control the inverter to start outputting industrial frequency alternating current.

[0013] Furthermore, in step S8 of the parallel and grid-connected mode control method, the synchronization controllers of multiple control systems are used for fine synchronization adjustment. The synchronization controllers will monitor and adjust the output of the inverter in real time to ensure consistency with the voltage, frequency, and phase of the power grid.

[0014] Advantages of the present invention: By increasing the rotation speed, the present invention effectively reduces the volume and weight of the equipment, precisely meets the pursuit of miniaturization of the mobile power generation device, makes the equipment more portable and deployable while maintaining high performance, and is particularly suitable for environments that require flexible movement or have limited space; The present invention adopts a lightweight range extender engine and a bearingless generator, which not only improves the portability of the system but also can efficiently generate high-frequency alternating current. Through precise rectification and inversion processes, this high-frequency electrical energy is converted into stable industrial frequency alternating current, meeting the emergency power supply requirements of power grid companies and ensuring reliable and stable power support in case of emergencies; The present invention integrates a CAN bus intelligent control system to achieve comprehensive intelligent management of the range extender engine, bearingless generator, rectifier, and inverter. Through efficient data communication and processing capabilities, this system ensures the coordinated operation of each component, greatly improving the operating efficiency, stability, and maintainability of the overall system; By integrating synchronization controllers, the present invention can achieve intelligent parallel and grid-connected control between multiple power generation devices. It simplifies the process of capacity expansion and load connection and provides a solid technical foundation for uninterrupted power supply. Whether dealing with sudden power outages or meeting the growing power demand, it can ensure the continuity and stability of power supply. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. For those skilled in the art, other drawings can be obtained based on the drawings without creative efforts.

[0016] Figure 1 Block diagram of the grid-connected mode of the control system of the range extender power generation device; Figure 2 Block diagram of the parallel operation mode of the control system of the range extender power generation device; Figure 3 Block diagram of the parallel operation and grid connection mode of the control system of the range extender power generation device; Specific implementation manners

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] As Figures 1-3 shown, a control system of a range extender power generation device, the control system is a modular system, Figures 1-3 the internal devices included in the two control systems of the first group of control systems 14 and the second group of control systems 15 shown are exactly the same. The following takes Figure 1 the first group of control systems 14 to illustrate the control system, including a display 1-8, a range extender engine 1-4, a bearingless generator 1-5, a controller 1-6, a rectifier 1-7, an inverter 1-9, a switch one 1-10, a synchronization controller 1-11, a switch two 1-12. The range extender engine 1-4 is connected to the controller 1-6 through a connecting conductor; the bearingless generator 1-5 is connected to the rectifier 1-7 through a connecting conductor; the rectifier 1-7 is connected to the controller 1-6 through a connecting conductor; the controller 1-6 is connected to the display 1-8 through a connecting conductor; the rectifier 1-7 is connected to the inverter 1-9 through a connecting conductor; the controller 1-6 is connected to the switch one 1-10 through a connecting conductor; the inverter 1-9 is connected to the synchronization controller 1-11 through a connecting conductor; the synchronization controller 1-11 is connected to the switch two 1-12 through a connecting conductor; the inverter 1-9 is connected to the switch one 1-10 through a connecting conductor; the switch one 1-10 is connected to the switch two 1-12 through a connecting conductor; the connecting conductor adopts a CAN bus (Controller Area Network, controller local area network bus).

[0019] As Figure 1 shown, a grid connection mode control method based on a control system of a range extender power generation device is disclosed, and the specific steps are as follows: S1. Connect the switch one 1-10 to the grid load 1 through a connecting conductor, and at the same time connect the switch two 1-12 to the grid power supply 3 through a connecting conductor; S2. The display 1-8 controls the switch one 1-10 to close through the controller 1-6. After the switch one 1-10 closes, the controller 1-6 instructs the range extender engine 1-4 to start and adjusts its speed to a predetermined value; S3. After the range extender engine 1-4 reaches the predetermined value, the controller 1-6 automatically controls the rectifier 1-7 to start working, ensuring that the bearingless generator 1-5 outputs direct current that meets the voltage requirements. When the DC voltage reaches the set standard, the controller 1-6 intervenes again, automatically controlling the inverter 1-9 to start and performing synchronization and grid connection operations; S4. After successful grid connection, adjust the output power of the inverter 1-9 through the display 1-8 to match the actual power demand of the grid. Then, disconnect the grid switch 2 to completely transfer the grid load to this control system. At this time, the grid power supply can be safely powered off for maintenance without affecting the normal power supply of the load; S5. After the grid power supply is repaired and powered on again, adjust the output parameters of the inverter 1-9 again through the display 1-8 according to the current state of the grid power supply, and use the synchronization controller 1-11 for fine synchronization adjustment. The synchronization controller 1-11 will monitor and adjust the output of the inverter 1-9 in real time to ensure that it is consistent with the voltage, frequency, and phase of the grid; S6. After reaching the synchronization conditions, the synchronization controller 1-11 controls the switch two 1-12 to close to achieve re-grid connection. Then, close the grid switch 2 to transfer the load from the control system to the grid; S7. Set the output power of the inverter 1-9 to 0 through the display 1-6, and control the gradual shutdown of this control system through the display 1-6 and the controller 1-6. The entire process realizes uninterrupted power supply and ensures the stable operation of the grid and the load.

[0020] As Figure 2 shown, a parallel operation mode control method based on a range extender power generation device control system is disclosed, which includes two control systems, and the two control systems are described as the first control system 14 and the second control system 15 respectively. The specific steps are as follows: S1. Connect the switch one 1-10 of the first control system 14 and the switch one 2-10 of the second control system 15 to the start-up main switch 13-1 through a connecting conductor. The start-up main switch 13-1 is connected to the grid load 1 through a connecting conductor, and connect the controller 1-6 of the first control system 14 and the controller 2-6 of the second control system 15 through a connecting conductor; S2. Start the first control system 14 so that the first control system 14 outputs industrial frequency alternating current; specifically: S201. Operate the display 1-8 to control the start-up of the range extender engine 1-4 through the controller 1-6 and adjust its speed to the predetermined value; S202. After the range extender engine 1-4 reaches the predetermined value, the controller 1-6 automatically controls the rectifier 1-7 to start working, ensuring that the bearingless generator 1-5 outputs direct current that meets the voltage requirements; S203. When the DC voltage reaches the set standard, the controller 1-6 intervenes again to automatically control the inverter 1-9 to start outputting industrial frequency alternating current; S3. Close switch 1-10 of the first set of control systems 14 and switch 2-10 of the second set of control systems 15; S4. Start the second set of control systems 15 so that the second set of control systems 14 outputs industrial frequency alternating current; specifically: S201. Operate the display 2-8 to control the start of the range extender engine 2-4 through the controller 2-6 and adjust its speed to a predetermined value; S202. After the range extender engine 2-4 reaches the predetermined value, the controller 2-6 automatically controls the rectifier 2-7 to start working to ensure that the bearingless generator 2-5 outputs direct current that meets the voltage requirements; S203. When the DC voltage reaches the set standard, the controller 2-6 intervenes again to automatically control the inverter 2-9 to start outputting industrial frequency alternating current; S5. When the first set of control systems 14 and the second set of control systems 15 reach the synchronization condition, perform synchronous parallel operation, and the parallel operation is completed; S6. Close the main start switch 13-1, and the inverters 1-9 of the first set of control systems 1 and the inverters 2-9 of the second set of control systems 15 perform load distribution. The load distribution is automatically proportionally distributed according to the respective capacities of the inverters 1-9 and the inverters 2-9.

[0021] In this embodiment, the parallel operation mode control method includes two or more sets of control systems to realize the parallel operation application scenario of multiple devices.

[0022] Such as Figure 3 shown, a parallel operation and grid connection mode control method based on a control system of a range extender power generation device is disclosed, which includes two sets of control systems. The two sets of control systems are respectively described by the first set of control systems 14 and the second set of control systems 15, and the specific steps are as follows: S1. Connect switch 1-10 of the first set of control systems 14 and switch 2-10 of the second set of control systems 15 to the grid load 1 through a connecting conductor, connect switch 1-12 of the first set of control systems 14 and switch 2-12 of the second set of control systems 15 to the grid power supply 3 through a connecting conductor, and connect the controller 1-6 of the first set of control systems 14 and the controller 2-6 of the second set of control systems 15 through a connecting conductor; S2. Start the first set of control systems 14 so that the first set of control systems 14 outputs industrial frequency alternating current; the specific steps are: S401. Operate the display 1-8 to control the start of the range extender engine 1-4 through the controller 1-6 and adjust its speed to a predetermined value; S402. After the range extender engine 1-4 reaches the predetermined value, the controller 1-6 automatically controls the rectifier 1-7 to start working, ensuring that the bearingless generator 1-5 outputs direct current that meets the voltage requirements; S403. When the DC voltage reaches the set standard, the controller 1-6 intervenes again and automatically controls the inverter 1-9 to start outputting industrial frequency alternating current; S3. Close switch 1-10 of the first set of control systems 14 and switch 2-10 of the second set of control systems 15; S4. Start the second set of control systems 15 so that the second set of control systems 15 outputs industrial frequency alternating current; The specific steps are as follows: S401. Operate the display 2-8 to control the start of the range extender engine 2-4 through the controller 2-6 and adjust its speed to the predetermined value; S402. After the range extender engine 2-4 reaches the predetermined value, the controller 2-6 automatically controls the rectifier 2-7 to start working, ensuring that the bearingless generator 2-5 outputs direct current that meets the voltage requirements; S403. When the DC voltage reaches the set standard, the controller 2-6 intervenes again and automatically controls the inverter 2-9 to start outputting industrial frequency alternating current; S5. After the first set of control systems 14 and the second set of control systems 15 reach the synchronization condition, perform synchronous paralleling, and the paralleling is completed; S6. According to the actual electricity consumption demand and the grid load situation, reasonably set the output loads of the first set of control systems 14 and the second set of control systems 15. The inverter 1-9 of the first set of control systems 14 and the inverter 2-9 of the second set of control systems 15 perform load distribution, and the load distribution is automatically proportionally distributed according to the respective capacities of the inverter 1-9 and the inverter 2-9; S7. Disconnect the online switch 2 and completely transfer the grid load 1 to the first set of control systems 14 and the second set of control systems 15; S8. Re-energize, the synchronization controller 1-11 adjusts the output of the inverter 1-9, the synchronization controller 2-11 adjusts the output of the inverter 2-9, and the first set of control systems 14 and the second set of control systems 15 are connected to the grid; In step S8, fine synchronization adjustment is performed using the synchronization controller 1-11 and the synchronization controller 2-11. The synchronization controller 1-11 will monitor and adjust the output of the inverter 1-9 in real time, and the synchronization controller 1-12 will monitor and adjust the output of the inverter 2-9 in real time to ensure consistency with the voltage, frequency, and phase of the grid; S9. After reaching the synchronization condition, the controller 1-6 controls the closing of switch 2 1-12, and the controller 2-6 controls the closing of 2-12 to transfer the load from the first set of control systems 14 and the second set of control systems 15 to the grid; S10. Set the output power of inverter 1-9 to 0 through display 1-8, set the output power of inverter 2-9 to 0 through display 2-8. Display 1-8 and controller 1-6 control the first set of control systems 14 to shut down step by step, and display 2-8 and controller 2-6 control the second set of control systems 15 to shut down step by step. Close the on-grid switch.

[0023] In this embodiment, this parallel operation and on-grid connection mode control method includes more than two sets of control systems, realizing parallel operation and on-grid connection operations, and realizing the application scenario of parallel operation and on-grid connection of multiple devices.

[0024] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Although the present invention has been disclosed as above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the technical solution content of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A control system for an extended-range power generation device, characterized in that: It includes a range-extended engine, a bearingless generator, a controller, a rectifier, an inverter, a switch one, a synchronous controller, and a switch two. The controller is electrically connected to the switch one, the engine is electrically connected to the controller, the rectifier is electrically connected to the generator, the controller, and the inverter respectively, the inverter is electrically connected to the synchronous controller, and the synchronous controller is electrically connected to the switch two.

2. The control system of the extended-range power generation device according to claim 1, characterized in that: The control system further comprises a display, which is electrically connected to the controller.

3. The control system of the extended-range power generation device according to claim 2, characterized in that: The display, controller, engine, generator, rectifier, inverter and synchronous controller are connected via a CAN bus.

4. A grid-connected mode control method, based on the control system of the extended-range power generation device according to claims 1-3, characterized in that: The specific steps are as follows: S1, connect switch 1 to the grid load, and connect switch 2 to the grid power supply; S2, the display controls the switch to be closed through the controller. After the switch is closed, the controller instructs the range-extended engine to start and adjusts its speed to a predetermined value; S3. After the range-extended engine reaches the preset value, the controller automatically controls the rectifier to start working, ensuring that the bearingless generator outputs DC power that meets the voltage requirements. When the DC voltage reaches the set standard, the controller intervenes again, automatically controls the inverter to start, and performs synchronous grid-connected operation; S4. After the grid connection is successful, the output power of the inverter is adjusted through the display to match the actual power demand of the grid, and then the online switch is disconnected to completely transfer the grid load to the control system, and the grid power supply is shut down for maintenance; S5. After the grid power supply is overhauled, power is turned on again. According to the current state of the grid power supply, the output parameters of the inverter are adjusted again through the display, and the synchronization controller is used to make fine synchronization adjustments. The synchronization controller will monitor and adjust the output of the inverter in real time to ensure that it is consistent with the voltage, frequency and phase of the grid. S6, after the synchronization condition is met, the synchronization controller controls the switch 2 to close, realizes the re-grid connection, and then closes the online switch to transfer the load from the control system to the grid; S7. Set the output power of the inverter to 0 through the display, and control the control system to shut down gradually through the display and the controller.

5. A parallel mode control method, based on the range-extended power generation device control system according to claims 1-3, characterized in that: The number of the control system is more than two groups, and the specific steps are as follows: S1. Connect the switches 1 of multiple control systems to the main power-on switch, connect the main power-on switch to the grid load, and connect the controllers in multiple control systems; S2, starting the first control system so that the first control system outputs industrial frequency alternating current; S3, close switch 1 of the multi-group control system; S4, starting the second control system so that the second control system outputs industrial frequency AC power; S5. When the first control system and the second control system reach the synchronization condition, they are synchronized and paralleled, and the paralleling is completed; S6. Close the main switch to distribute the load among the inverters of multiple control systems. The load distribution is automatically proportional to the capacity of each inverter.

6. The parallel mode control method according to claim 5, characterized in that: The startup method involved in step S2 and step S4 is the same, and step S2 or S4 is specifically: S201, the operation display controls the start of the extended-range engine through the controller, and adjusts its speed to a predetermined value; S202, after the range-extended engine reaches a predetermined value, the controller automatically controls the rectifier to start working, ensuring that the bearingless generator outputs direct current that meets the voltage requirements; S203. When the DC voltage reaches the set standard, the controller intervenes again and automatically controls the inverter to start outputting industrial frequency AC power.

7. A control method for parallel machine and grid connection mode, based on the control system of the extended range power generation device according to claims 1-3, characterized in that: The number of the control system is more than two groups, and the specific steps are as follows: S1, connecting switch 1 of multiple control systems to the grid load, connecting switch 2 of multiple control systems to the grid power supply, and connecting controllers in multiple control systems; S2, starting the first control system so that the first control system outputs industrial frequency alternating current; S3, close switch 1 of the multi-group control system; S4, starting the second control system so that the second control system outputs industrial frequency AC power; S5. When the first control system and the second control system reach the synchronization condition, they are synchronized and paralleled, and the paralleling is completed; S6. According to the actual power demand and grid load, the output loads of multiple control systems are reasonably set, and the inverters of multiple control systems are load-distributed. The load distribution is automatically proportionally distributed according to the capacity of each inverter; S7, disconnect the online switch and completely transfer the grid load to multiple control systems; S8, restore power, adjust the inverter through the synchronous controller, and connect multiple control systems to the grid; S9, after the synchronization condition is met, the controller controls switch 2 to close, transferring the load from the multiple control systems to the power grid; S10. Set the output power of the inverter to 0 through the display. The display and controller control multiple control systems to shut down gradually and close the online switch.

8. The control method for parallel machine and grid connection mode according to claim 7, characterized in that: The startup method involved in step S2 and step S4 is the same, and step S2 or S4 is specifically: S401, the operation display controls the start of the extended-range engine through the controller, and adjusts its speed to a predetermined value; S402, after the range-extended engine reaches a predetermined value, the controller automatically controls the rectifier to start working, ensuring that the bearingless generator outputs direct current that meets the voltage requirements; S403. When the DC voltage reaches the set standard, the controller intervenes again and automatically controls the inverter to start outputting industrial frequency AC power.

9. The control method for parallel machine and grid connection mode according to claim 7, characterized in that: In step S8, the synchronization controllers of multiple control systems are used to perform fine synchronization adjustment. The synchronization controllers will monitor and adjust the output of the inverter in real time to ensure that the voltage, frequency and phase are consistent with those of the power grid.

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