Wind power direct current combined rail transit train starting and stopping charging and discharging system

Abstract

The present application relates to wind power energy storage device technical field, especially point to a kind of wind power dc is incorporated into rail transit train start-stop charging and discharging system.The rail transit train start-stop charging and discharging system described in the present application makes full use of the characteristics of high service life, large specific power and low unit power cost of vacuum magnetic suspension flywheel energy storage, and simultaneously utilizes the advantages of high charging and discharging efficiency of super capacitor, combines wind power dc incorporation technology, which can effectively avoid the loss of converting dc into ac, so that the whole system reduces both the power consumption of train and equipment cost.

Description

Technical Field

[0001] This invention relates to the field of wind power energy storage technology, and in particular to a wind power DC-connected rail transit train start-stop charging and discharging system. Background Technology

[0002] Rail transit, as a high-capacity, high-density mode of transportation, plays an increasingly important role in public transportation. Rail transit is characterized by short operating distances between stations, high operating speeds, and frequent starts and stops. Generally, the regenerative braking energy of rail transit can reach 30% to 40% of the traction power consumption in the power supply system.

[0003] Currently, commonly used methods for recovering braking energy in rail transit trains include energy storage recovery and inverter feedback. Energy storage recovery is not connected to the AC power grid; it releases energy during train startup, is unaffected by grid harmonics, and saves on equipment such as AC medium-voltage transformers, offering significant advantages over traditional inverter feedback. Energy storage absorption methods include supercapacitor energy storage, flywheel energy storage, and chemical battery energy storage. Chemical batteries have a short cycle life but slow response time. Flywheel energy storage is a mechanical energy storage method with a long cycle life and fast response speed. Supercapacitors are a new type of energy storage device that stores energy through polarized electrolytes, featuring high specific power, long cycle life, high charge / discharge efficiency, high safety, and small size.

[0004] How to effectively leverage the advantages of different energy storage methods and apply them to the recovery of braking energy in rail transit trains can reduce the train's electricity consumption and equipment costs, yielding significant economic and social benefits, and has already attracted widespread attention. Summary of the Invention

[0005] Therefore, the technical problem to be solved by this invention is how to reduce the electricity consumption and equipment cost of trains.

[0006] To solve the above-mentioned technical problems, the present invention provides a rail transit train start-stop charging and discharging system, comprising:

[0007] Train drive and braking system, used to drive or brake a train;

[0008] The flywheel energy storage system is connected to the train drive and braking system and is used to store electrical energy during train braking and to supply electrical energy to the train drive and braking system during train startup.

[0009] A supercapacitor and distributed wind power DC parallel system is connected to the train drive and braking system. It includes multiple supercapacitors and multiple distributed direct-drive wind turbines connected in parallel. The system is used to charge the multiple supercapacitors connected in parallel during train braking and to supply electrical energy to the train drive and braking system during train startup and operation.

[0010] The control system is connected to the supercapacitor and distributed wind power DC-DC integration system and the flywheel energy storage system, and is used to receive train signals and control the flywheel energy storage system and the supercapacitor and distributed wind power DC-DC integration system to operate according to the train signals.

[0011] Preferably, the train drive and braking system includes:

[0012] Train traction motors are used as brake motors during train braking and as motors during train starting and running.

[0013] The first voltage conversion module is connected to the train traction motor and is used to convert voltage.

[0014] The first DC bus is connected to the first voltage conversion module.

[0015] Preferably, the flywheel energy storage system includes:

[0016] The first circuit breaker is connected to the first DC bus;

[0017] The second voltage conversion module is connected to the first circuit breaker and is used to convert voltage.

[0018] The vacuum magnetic levitation flywheel energy storage device is connected to the second voltage conversion module.

[0019] Preferably, the second voltage conversion module includes:

[0020] A bidirectional AC / DC converter is connected to the first circuit breaker;

[0021] The high-frequency transformer is connected to the vacuum magnetic levitation flywheel energy storage device of the bidirectional AC / DC converter.

[0022] Preferably, the supercapacitor and distributed wind power DC integration system includes:

[0023] The second circuit breaker is connected to the first DC bus;

[0024] The third voltage conversion module is connected to the second circuit breaker and is used to convert voltage.

[0025] The second DC bus is connected to the third voltage conversion module;

[0026] The third circuit breaker group includes multiple third circuit breakers, which are respectively connected to the second DC bus;

[0027] The fourth circuit breaker group includes multiple fourth circuit breakers, each connected to the second DC bus.

[0028] The fourth voltage conversion module group includes multiple fourth voltage conversion modules, which are respectively connected to the multiple third circuit breakers for voltage conversion;

[0029] The fifth voltage conversion module group includes multiple fifth voltage conversion modules, which are respectively connected to the multiple fourth circuit breakers for voltage conversion;

[0030] Multiple supercapacitors are respectively connected to the multiple third circuit breakers through the fourth voltage conversion module;

[0031] Multiple distributed direct-drive wind turbine units are connected to the multiple fourth circuit breakers through the fifth voltage conversion module.

[0032] Preferably, the third voltage conversion module includes:

[0033] A unidirectional AC / DC converter is connected to the second circuit breaker;

[0034] A transformer is connected to the unidirectional AC / DC converter.

[0035] A unidirectional DC / AC converter is connected to the transformer and the second DC bus.

[0036] Preferably, the control method of the control system includes:

[0037] When a train braking signal is received:

[0038] The first circuit breaker is kept closed, so that the braking energy output by the train drive and braking system is delivered to the vacuum magnetic levitation flywheel energy storage device for storage.

[0039] The second circuit breaker is kept open, and the third and fourth circuit breaker groups are kept closed, so that the multiple distributed direct-drive wind turbines charge the multiple supercapacitors.

[0040] Preferably, the control method of the control system includes:

[0041] When the train start signal is received:

[0042] The first circuit breaker is kept closed, and the vacuum magnetic levitation flywheel energy storage device is controlled to supply electrical energy to the train drive and braking system.

[0043] The system controls the second, third, and fourth circuit breaker groups to remain closed, and controls the multiple distributed direct-drive wind turbines and multiple supercapacitors to supply electrical energy to the train drive and braking system.

[0044] Preferably, the control method of the control system includes:

[0045] When a train operation signal is received:

[0046] Keep the first circuit breaker in the open state;

[0047] The system controls the second and fourth circuit breaker groups to remain closed, controls the third circuit breaker group to remain open, and controls the multiple distributed direct-drive wind turbines and the power grid to supply electrical energy to the train drive and braking system.

[0048] Preferably, the control method of the control system includes:

[0049] When a train stop signal is received:

[0050] Keep the first circuit breaker in the open state;

[0051] The third circuit breaker group is controlled to remain open, the second and fourth circuit breaker groups are controlled to remain closed, and the multiple distributed direct-drive wind turbines are controlled to transmit electrical energy to the power grid.

[0052] The technical solution of the present invention has the following advantages compared with the prior art:

[0053] The rail transit train start-stop charging and discharging system described in this invention fully utilizes the advantages of vacuum magnetic levitation flywheel energy storage, such as long lifespan, high specific power, and low cost per unit power. At the same time, it leverages the high charging and discharging efficiency of supercapacitors and combines them with wind power DC integration technology. This effectively avoids the losses in converting DC to AC, thereby reducing the train's power consumption and lowering equipment costs. Attached Figure Description

[0054] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0055] Figure 1 This is a schematic diagram of the framework of a rail transit train start-stop charging and discharging system provided in one embodiment of the present invention;

[0056] Explanation of reference numerals in the attached diagram: Train traction motor (1-1); Bidirectional DC / AC converter (1-2); 1500V DC bus (1-3); First circuit breaker (2-1); Bidirectional AC / DC converter (2-2); High-frequency transformer (2-3); Vacuum magnetic levitation flywheel energy storage device (2-4); Second circuit breaker (3-1); Unidirectional AC / DC converter (3-2); Transformer (3-3); Unidirectional DC / AC converter (3-4); 800V DC bus (3-5); Third circuit breaker group (3-6), Bidirectional DC / DC converter (3-7); Supercapacitor (3-8); Fourth circuit breaker group (3-9); Unidirectional AC / DC converter (3-10); Distributed direct-drive wind turbine (3-11); Control system (4). Detailed Implementation

[0057] The core of this invention is to provide a starting, stopping, charging, and discharging system for rail transit trains, which effectively reduces the train's electricity consumption and equipment costs.

[0058] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] The present invention provides a rail transit train start-stop charging and discharging system; specifically including:

[0060] Train drive and braking system, used to drive or brake a train;

[0061] The flywheel energy storage system is connected to the train drive and braking system and is used to store electrical energy during train braking and to supply electrical energy to the train drive and braking system during train startup.

[0062] The supercapacitor and distributed wind power DC parallel system is connected to the train drive and braking system and the flywheel energy storage system. It includes multiple supercapacitors and multiple distributed direct-drive wind turbines connected in parallel. It is used to charge the multiple supercapacitors connected in parallel during train braking and to supply electrical energy to the train drive and braking system during train startup and operation.

[0063] The control system is connected to the supercapacitor and distributed wind power DC-DC integration system and the flywheel energy storage system, and is used to receive train signals and control the flywheel energy storage system and the supercapacitor and distributed wind power DC-DC integration system to operate according to the train signals.

[0064] Based on the above embodiments, this embodiment provides a detailed description of the train drive and braking system:

[0065] The train drive and braking system includes:

[0066] Train traction motors are used as brake motors during train braking and as motors during train starting and running.

[0067] The first voltage conversion module is connected to the train traction motor and is used to convert voltage.

[0068] The first DC bus is connected to the first voltage conversion module.

[0069] In some embodiments, the train traction motor power is 2880kW.

[0070] In some embodiments, the first DC bus is a 1500V DC bus.

[0071] In some embodiments, the first voltage conversion module includes a bidirectional DC / AC converter.

[0072] Based on the above embodiments, this embodiment provides a detailed description of the flywheel energy storage system:

[0073] Flywheel energy storage systems include:

[0074] The first circuit breaker is connected to the first DC bus;

[0075] The second voltage conversion module is connected to the first circuit breaker and is used to convert voltage.

[0076] The vacuum magnetic levitation flywheel energy storage device is connected to the second voltage conversion module.

[0077] In some embodiments, the vacuum magnetic levitation flywheel energy storage device is a 690V high-speed vacuum magnetic levitation flywheel with a rated output power of 2000kW.

[0078] In some embodiments, the second voltage conversion module includes:

[0079] A bidirectional AC / DC converter is connected to the first circuit breaker;

[0080] A high-frequency transformer is connected to the bidirectional AC / DC converter and the vacuum magnetic levitation flywheel energy storage device.

[0081] Based on the above embodiments, this embodiment provides a detailed description of the supercapacitor and distributed wind power DC integration system:

[0082] Supercapacitor and distributed wind power DC integration systems include:

[0083] The second circuit breaker is connected to the first DC bus;

[0084] The third voltage conversion module is connected to the second circuit breaker and is used to convert voltage.

[0085] The second DC bus is connected to the third voltage conversion module;

[0086] The third circuit breaker group includes multiple third circuit breakers, which are respectively connected to the second DC bus;

[0087] The fourth circuit breaker group includes multiple fourth circuit breakers, each connected to the second DC bus.

[0088] The fourth voltage conversion module group includes multiple fourth voltage conversion modules, which are respectively connected to the multiple third circuit breakers for voltage conversion;

[0089] The fifth voltage conversion module group includes multiple fifth voltage conversion modules, which are respectively connected to the multiple fourth circuit breakers for voltage conversion;

[0090] Multiple supercapacitors are respectively connected to the multiple third circuit breakers through the fourth voltage conversion module;

[0091] Multiple distributed direct-drive wind turbine units are connected to the multiple fourth circuit breakers through the fifth voltage conversion module.

[0092] In some embodiments, the third voltage conversion module includes:

[0093] A unidirectional AC / DC converter is connected to the second circuit breaker;

[0094] A transformer is connected to the unidirectional AC / DC converter.

[0095] A unidirectional DC / AC converter is connected to the transformer and the second DC bus.

[0096] In some embodiments, the fourth voltage conversion module includes a bidirectional DC / DC converter.

[0097] In some embodiments, the fifth voltage conversion module includes a unidirectional AC / DC converter.

[0098] In some embodiments, the second DC bus is an 800V DC bus.

[0099] In some embodiments, the supercapacitor is a group of supercapacitors.

[0100] In some embodiments, the supercapacitor has a rated output power of 300kW.

[0101] In some embodiments, the rated power of the distributed direct-drive wind turbine is 300kW.

[0102] In some embodiments, the distributed direct-drive wind turbine is a single or multiple direct-drive wind turbine generators.

[0103] Vacuum magnetic levitation flywheel energy storage boasts a high power density and low cost per unit power. While supercapacitor energy storage has a higher cost per unit power than vacuum magnetic levitation flywheel energy storage, its charge-discharge efficiency reaches 97%, higher than the 90% of vacuum magnetic levitation flywheel energy storage, making it suitable for integration with distributed generation systems as a supplementary energy source. Wind power DC-DC integration technology utilizes power electronics to convert the AC power generated by wind turbines into DC power and stably integrate it into the grid. Its transmission process avoids the losses associated with converting DC to AC, thus improving energy conversion efficiency. It is typically used in direct-drive or semi-direct-drive wind turbines. Combining this technology with energy storage can further improve the utilization rate of new energy sources. Therefore, combining supercapacitors with distributed wind power DC-DC integration technology can effectively avoid the losses associated with converting DC to AC, thereby reducing both the power consumption of the train and the equipment cost of the entire system.

[0104] refer to Figure 1 , Figure 1 This is a schematic diagram of the framework of a rail transit train start-stop charging and discharging system provided in one embodiment of the present invention.

[0105] Based on the above embodiments, the control method of the control system will be described in detail:

[0106] When a train braking signal is received:

[0107] The first circuit breaker is kept closed, so that the braking energy output by the train drive and braking system is delivered to the vacuum magnetic levitation flywheel energy storage device for storage.

[0108] The second circuit breaker is kept open, and the third and fourth circuit breaker groups are kept closed, so that the multiple distributed direct-drive wind turbines charge the multiple supercapacitors.

[0109] In some embodiments, the train traction motor is used as a brake motor during braking, converting the train braking energy into electrical energy and transmitting it to the 1500V DC bus. After receiving the train braking signal, the control system controls the first circuit breaker to remain closed, converts the 1500V DC power into AC power through a bidirectional AC / DC converter, and then steps down the AC power through a high-frequency transformer, transmitting the electrical energy to the vacuum magnetic levitation flywheel energy storage device for storage.

[0110] During train braking, the control system keeps the second circuit breaker open, and the supercapacitor and distributed wind power DC are connected to the system but disconnected from the train drive and braking system; the third and fourth circuit breaker groups remain closed, and the distributed direct-drive wind turbine converts AC power into DC power through a unidirectional AC / DC converter and transmits it to the 800V DC bus, which then charges the supercapacitor.

[0111] In one specific embodiment, the train traction motor (1-1) is used as a brake motor during braking. Part of the braking energy can be converted into electrical energy through the brake motor. The braking power is ≤2000kW, and the electrical energy is transmitted to the 1500V DC bus (1-3). After receiving the train braking signal, the control system (4) controls the first circuit breaker (2-1) to remain closed. The 1500V DC power is converted into AC power through the bidirectional AC / DC converter (2-2), and then the AC power is stepped down to 690V through the high-frequency transformer (2-3). The electrical energy is transmitted to the vacuum magnetic levitation flywheel energy storage device (2-4) for storage.

[0112] During train braking, the control system (4) controls the second circuit breaker (3-1) to remain open, and the supercapacitor and the distributed wind power DC parallel system (3) are disconnected from the train drive and braking system (1); the third circuit breaker group (3-6) and the fourth circuit breaker group (3-9) remain closed, and the distributed direct-drive wind turbine (3-11) converts AC power into DC power through a unidirectional AC / DC converter (3-10) and transmits it to the 800V DC bus (3-5), and charges the supercapacitor (3-8) through the 800V DC bus (3-5).

[0113] When the train start signal is received:

[0114] The first circuit breaker is kept closed, and the vacuum magnetic levitation flywheel energy storage device is controlled to supply electrical energy to the train drive and braking system.

[0115] The system controls the second, third, and fourth circuit breaker groups to remain closed, and controls the multiple distributed direct-drive wind turbines and multiple supercapacitors to supply electrical energy to the train drive and braking system.

[0116] In some embodiments, during the train start-up process, the train traction motor is used as an electric motor. After the control system receives the train start signal, the first circuit breaker remains closed. The electrical energy stored in the vacuum magnetic levitation flywheel energy storage device is boosted by a high-frequency transformer and then converted into 1500V DC power by a bidirectional AC / DC converter. The electrical energy is then transmitted to the 1500V DC bus to supply power to the train traction motor.

[0117] Because the electrical energy required for train startup exceeds the energy recovered during braking, and the flywheel energy storage system experiences losses during charging and discharging, supercapacitors and distributed wind power DC power are needed to supplement the insufficient electrical energy. The control system keeps the second, third, and fourth circuit breaker groups closed. Distributed direct-drive wind turbines convert AC power to DC power via a unidirectional AC / DC converter and transmit it to the 800V DC bus. The energy stored in the supercapacitors is transmitted to the 800V DC bus via a bidirectional DC / DC converter. The 800V DC power is then converted to 1500V DC power via a unidirectional DC / AC converter, a transformer, and another unidirectional AC / DC converter, and transmitted to the 1500V DC bus to power the train traction motors. If the electrical energy supplied by the supercapacitors and distributed wind power DC power is still insufficient, it is supplied by the power grid.

[0118] In one specific embodiment, during the train start-up process, the train traction motor (1-1) is used as an electric motor. After the control system (4) receives the train start-up signal, the first circuit breaker (2-1) remains closed. The electrical energy stored in the vacuum magnetic levitation flywheel energy storage device (2-4) is boosted by the high-frequency transformer device (2-3), and then converted into 1500V DC power by the bidirectional AC / DC converter device (2-2). The electrical energy is then transmitted to the 1500V DC bus (1-3) to supply power to the train traction motor.

[0119] The control system (4) controls the second circuit breaker (3-1), the third circuit breaker group (3-6), and the fourth circuit breaker group (3-9) to remain closed. The distributed direct-drive wind turbine (3-11) converts AC power into DC power through a unidirectional AC / DC converter (3-10) and transmits it to the 800V DC bus (3-5). The electrical energy stored in the supercapacitor (3-8) is transmitted to the 800V DC bus (3-5) through a bidirectional DC / DC converter (3-7). The 800V DC power is converted into 1500V DC power through a unidirectional DC / AC converter (3-4), a transformer (3-3), and a unidirectional AC / DC converter (3-2) in sequence, and the electrical energy is transmitted to the 1500V DC bus (1-3) to supply power to the train traction motor. The total rated power of the flywheel energy storage system (2) and the supercapacitor and distributed wind power DC integration system (3) is 2600kW, which is less than the power of the train motor. Therefore, the insufficient power is provided by the power grid.

[0120] When a train operation signal is received:

[0121] Keep the first circuit breaker in the open state;

[0122] The system controls the second and fourth circuit breaker groups to remain closed, controls the third circuit breaker group to remain open, and controls the multiple distributed direct-drive wind turbines and the power grid to supply electrical energy to the train drive and braking system.

[0123] In some embodiments, during train operation, the train traction motor is used as an electric motor to pull the train. After the control system receives the train start signal, the first circuit breaker remains open, and the flywheel energy storage system stops operating.

[0124] The control system keeps the second and fourth circuit breaker groups closed. The distributed direct-drive wind turbines convert AC power to DC power via a unidirectional AC / DC converter and transmit it to the 800V DC bus. The 800V DC power is then converted to 1500V DC power via a unidirectional DC / AC converter, a transformer, and another unidirectional AC / DC converter, and transmitted to the 1500V DC bus to power the train traction motors. The power output of the distributed direct-drive wind turbines is less than the power required by the traction motors during normal train operation; the remaining power is supplied by the power grid.

[0125] The control system keeps the third circuit breaker group in the open state, and the supercapacitor is no longer in use.

[0126] In one specific embodiment, during train operation, the train traction motor (1-1) is used as an electric motor to pull the train. After the control system (4) receives the train start signal, the first circuit breaker (2-1) remains open, and the flywheel energy storage system (2) stops operating.

[0127] The control system (4) controls the second circuit breaker (3-1) and the fourth circuit breaker group (3-9) to remain closed. The distributed direct-drive wind turbine (3-11) converts AC power into DC power through a unidirectional AC / DC converter (3-10) and transmits it to the 800V DC bus (3-5). The 800V DC power is then converted into 1500V DC power through a unidirectional DC / AC converter (3-4), a transformer (3-3), and a unidirectional AC / DC converter (3-2), and the power is transmitted to the 1500V DC bus (1-3) to supply power to the train traction motor. Since the rated power of the distributed direct-drive wind turbine (3-11) is 300kW, which is less than the power required by the traction motor when the train is running normally, the remaining power is supplied by the power grid.

[0128] The control system (4) controls the third circuit breaker group (3-6) to remain in the open state, and the supercapacitor (3-8) to stop being used.

[0129] When a train stop signal is received:

[0130] Keep the first circuit breaker in the open state;

[0131] The third circuit breaker group is controlled to remain open, the second and fourth circuit breaker groups are controlled to remain closed, and the multiple distributed direct-drive wind turbines are controlled to transmit electrical energy to the power grid.

[0132] In one specific embodiment, during train braking, the control system (4) controls the first circuit breaker (2-1) and the third circuit breaker group (3-6) to remain open, and the flywheel energy storage system (2) and the supercapacitor (3-8) are disconnected from the train drive and braking system (1). The control circuit breaker (3-1) and the circuit breaker (3-9) are kept closed, and the distributed direct-drive wind turbine (3-11) transmits power to the grid sequentially through the 800V DC bus (3-5) and the 1500V DC bus (1-3).

[0133] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A starting, stopping, charging, and discharging system for rail transit trains, characterized in that, include: A train drive and braking system for driving or braking a train; wherein the train drive and braking system includes a first DC bus; The flywheel energy storage system is connected to the train drive and braking system and is used to store electrical energy during train braking and to supply electrical energy to the train drive and braking system during train startup. A supercapacitor and distributed wind power DC parallel system is connected to the train drive and braking system. It includes multiple supercapacitors and multiple distributed direct-drive wind turbines connected in parallel. The system is used to charge the multiple supercapacitors connected in parallel during train braking and to supply electrical energy to the train drive and braking system during train startup and operation. The control system is connected to the supercapacitor and distributed wind power DC-DC integration system and the flywheel energy storage system, and is used to receive train signals and control the flywheel energy storage system and the supercapacitor and distributed wind power DC-DC integration system to work according to the train signals. The supercapacitor and distributed wind power DC integration system also includes: The second circuit breaker is connected to the first DC bus; The third voltage conversion module is connected to the second circuit breaker and is used to convert voltage. The second DC bus is connected to the third voltage conversion module; The third circuit breaker group includes multiple third circuit breakers, which are respectively connected to the second DC bus; The fourth circuit breaker group includes multiple fourth circuit breakers, each connected to the second DC bus. The fourth voltage conversion module group includes multiple fourth voltage conversion modules, which are respectively connected to the multiple third circuit breakers for voltage conversion; The fifth voltage conversion module group includes multiple fifth voltage conversion modules, which are respectively connected to the multiple fourth circuit breakers for voltage conversion; Multiple supercapacitors are respectively connected to the multiple third circuit breakers through the fourth voltage conversion module; Multiple distributed direct-drive wind turbine units are connected to the multiple fourth circuit breakers through the fifth voltage conversion module.

2. The rail transit train start-stop charging and discharging system according to claim 1, characterized in that, The train drive and braking system includes: Train traction motors are used as brake motors during train braking and as motors during train starting and running. The first voltage conversion module is connected to the train traction motor and the first DC bus and is used to convert voltage.

3. The rail transit train start-stop charging and discharging system according to claim 2, characterized in that, The flywheel energy storage system includes: The first circuit breaker is connected to the first DC bus; The second voltage conversion module is connected to the first circuit breaker and is used to convert voltage. The vacuum magnetic levitation flywheel energy storage device is connected to the second voltage conversion module.

4. The rail transit train start-stop charging and discharging system according to claim 3, characterized in that, The second voltage conversion module includes: A bidirectional AC / DC converter is connected to the first circuit breaker; A high-frequency transformer is connected to the bidirectional AC / DC converter and the vacuum magnetic levitation flywheel energy storage device.

5. The rail transit train start-stop charging and discharging system according to claim 1, wherein the third voltage conversion module comprises: A unidirectional AC / DC converter is connected to the second circuit breaker; A transformer is connected to the unidirectional AC / DC converter. A unidirectional DC / AC converter is connected to the transformer and the second DC bus.

6. The rail transit train start-stop charging and discharging system according to claim 1, characterized in that, The control method of the control system includes: When a train braking signal is received: The first circuit breaker is kept closed, so that the braking energy output by the train drive and braking system is sent to the vacuum magnetic levitation flywheel energy storage device for storage. The second circuit breaker is kept open, and the third and fourth circuit breaker groups are kept closed, so that the multiple distributed direct-drive wind turbines charge the multiple supercapacitors.

7. The rail transit train start-stop charging and discharging system according to claim 1, characterized in that, The control method of the control system includes: When the train start signal is received: The first circuit breaker is kept closed, and the vacuum magnetic levitation flywheel energy storage device is controlled to supply electrical energy to the train drive and braking system. The system controls the second, third, and fourth circuit breaker groups to remain closed, and controls the multiple distributed direct-drive wind turbines and multiple supercapacitors to supply electrical energy to the train drive and braking system.

8. The rail transit train start-stop charging and discharging system according to claim 1, characterized in that, The control method of the control system includes: When a train operation signal is received: Keep the first circuit breaker in the open state; The system controls the second and fourth circuit breaker groups to remain closed, controls the third circuit breaker group to remain open, and controls the multiple distributed direct-drive wind turbines and the power grid to supply electrical energy to the train drive and braking system.

9. The rail transit train start-stop charging and discharging system according to claim 1, characterized in that, The control method of the control system includes: When a train stop signal is received: Keep the first circuit breaker in the open state; The third circuit breaker group is controlled to remain open, the second and fourth circuit breaker groups are controlled to remain closed, and the multiple distributed direct-drive wind turbines are controlled to transmit electrical energy to the power grid.

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