Wind power direct current incorporated rail transit train start-stop charge-discharge system

Abstract

The invention relates to the technical field of wind power energy storage devices, in particular to a wind power direct current incorporated rail transit train start-stop charging and discharging system. According to the rail transit train start-stop charging and discharging system, the characteristics that the vacuum magnetic suspension flywheel is long in energy storage life, large in specific power and low in unit power cost are fully utilized, meanwhile, the advantage that the super capacitor is high in charging and discharging efficiency is utilized, and the super capacitor is combined with a wind power direct current incorporation technology; the loss of converting direct current into alternating current can be effectively avoided, so that the whole system not only reduces the electricity consumption of a train, but also reduces the equipment cost.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power energy storage devices, and in particular to a rail transit train start-stop charging and discharging system in which wind power direct current is integrated. Background Art

[0002] Rail transit, as a high-volume, high-density means of transportation, plays an increasingly important role in public transportation. Rail transit has the characteristics of short running distance between stations, high running speed, frequent starting and braking, etc. Generally, the regenerative braking energy of rail transit can reach 30% to 40% of the traction power in the power supply system.

[0003] At present, the commonly used rail transit train braking energy recovery methods include energy storage recovery method and inverter feedback method. Among them, the energy storage recovery method is not connected to the AC power grid, and releases energy when the train starts. It is not affected by the harmonics of the power grid, and can save equipment such as AC medium-voltage transformers. Compared with the traditional inverter feedback method, it has obvious advantages. 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 and short cycle life. Flywheel energy storage is a mechanical energy storage method with a long cycle life and fast response speed. Supercapacitor is a new type of energy storage device that stores energy through polarized electrolytes. It has the characteristics of high specific power, long cycle life, high charging and discharging efficiency, high safety, and small size.

[0004] How to effectively leverage the advantages of different energy storage methods and apply them to rail transit train braking energy recovery to reduce train power consumption and equipment costs has good economic and social benefits and has received widespread attention. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is how to reduce the power consumption and equipment cost of the train.

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

[0007] Train driving and braking systems, used to drive or brake the train;

[0008] A flywheel energy storage system connected to the train drive and brake system for storing electric energy during the train braking process and transmitting electric energy to the train drive and brake system during the train starting process;

[0009] A supercapacitor and distributed wind power direct current incorporation system, connected to the train drive and brake system, comprising a plurality of supercapacitors and a plurality of distributed direct-drive wind turbines connected in parallel, for charging the plurality of supercapacitors connected in parallel during train braking, and for delivering electrical energy to the train drive and brake system during train startup and operation;

[0010] A control system is connected to the supercapacitor and distributed wind power 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 integration system to work according to the train signals.

[0011] Preferably, the train driving and braking system comprises:

[0012] Train traction motor, used as a brake motor during train braking and as a motor during train starting and running;

[0013] A first voltage conversion module, connected to the train traction motor, for converting voltage;

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

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

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

[0017] A second voltage conversion module, connected to the first circuit breaker, for converting 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 commutation device connected to the first circuit breaker;

[0021] A 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 comprises:

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

[0024] A third voltage conversion module, connected to the second circuit breaker, for converting voltage;

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

[0026] A third circuit breaker group, including a plurality of third circuit breakers, respectively connected to the second DC bus;

[0027] a fourth circuit breaker group, comprising a plurality of fourth circuit breakers, each of which is connected to the second DC bus;

[0028] a fourth voltage conversion module group, comprising a plurality of fourth voltage conversion modules, respectively connected to the plurality of third circuit breakers, for converting voltage;

[0029] a fifth voltage conversion module group, comprising a plurality of fifth voltage conversion modules, respectively connected to the plurality of fourth circuit breakers, for converting voltage;

[0030] A plurality of supercapacitors are respectively connected to the plurality of third circuit breakers through the fourth voltage conversion modules;

[0031] A plurality of distributed direct-drive wind turbine sets are respectively connected to the plurality of fourth circuit breakers through the fifth voltage conversion modules.

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

[0033] a unidirectional AC / DC commutation device connected to the second circuit breaker;

[0034] A transformer 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 brake signal is received:

[0038] Controlling the first circuit breaker to remain in a closed state so that the braking electric energy output by the train driving and braking system is transmitted to the vacuum magnetic levitation flywheel energy storage device for storage;

[0039] The second circuit breaker is controlled to remain in an open state, and the third circuit breaker group and the fourth circuit breaker group are controlled to remain in a closed state, so that the multiple distributed direct-drive wind turbine groups charge the multiple supercapacitors.

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

[0041] When receiving the train start signal:

[0042] Controlling the first circuit breaker to remain in a closed state, and controlling the vacuum magnetic levitation flywheel energy storage device to deliver electric energy to the train driving and braking system;

[0043] The second circuit breaker, the third circuit breaker group and the fourth circuit breaker group are controlled to remain in a closed state, and the multiple distributed direct-drive wind turbine groups and the multiple supercapacitors are controlled to transmit electrical energy to the train drive and braking system.

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

[0045] When receiving a train running signal:

[0046] Controlling the first circuit breaker to remain in an open state;

[0047] The second circuit breaker and the fourth circuit breaker group are controlled to remain in a closed state, the third circuit breaker group is controlled to remain in an open state, and the multiple distributed direct-drive wind turbine groups and the power grid are controlled to transmit 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] Controlling the first circuit breaker to remain in an open state;

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

[0052] The above 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 the present invention fully utilizes the characteristics of the vacuum magnetic levitation flywheel, such as long energy storage life, large specific power, and low unit power cost, while utilizing the advantage of the high charging and discharging efficiency of the supercapacitor and combining it with the wind power DC incorporation technology, which can effectively avoid the loss of converting DC power into AC power, so that the entire system not only reduces the power consumption of the train, but also reduces the equipment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

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

[0056] Explanation of the reference numerals: 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 group (3-11); control system (4). DETAILED DESCRIPTION

[0057] The core of the present invention is to provide a rail transit train start-stop charging and discharging system, which effectively reduces the train's power consumption and equipment costs.

[0058] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work 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 comprising:

[0060] Train driving and braking systems, used to drive or brake the train;

[0061] A flywheel energy storage system connected to the train drive and brake system for storing electric energy during the train braking process and transmitting electric energy to the train drive and brake system during the train starting process;

[0062] A supercapacitor and distributed wind power direct current incorporation system, connected to the train drive and brake system and the flywheel energy storage system, comprising a plurality of supercapacitors and a plurality of distributed direct-drive wind turbines connected in parallel, for charging the plurality of supercapacitors connected in parallel during train braking, and for delivering electrical energy to the train drive and brake system during train startup and operation;

[0063] A control system is connected to the supercapacitor and distributed wind power 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 integration system to work according to the train signals.

[0064] Based on the above embodiments, this embodiment describes the train driving and braking system in detail:

[0065] The train drive and braking system includes:

[0066] Train traction motor, used as a brake motor during train braking and as a motor during train starting and running;

[0067] A first voltage conversion module, connected to the train traction motor, for converting voltage;

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

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

[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 inverter.

[0072] Based on the above embodiments, this embodiment describes the flywheel energy storage system in detail:

[0073] The flywheel energy storage system includes:

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

[0075] A second voltage conversion module, connected to the first circuit breaker, for converting 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 commutation device 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 describes in detail the supercapacitor and distributed wind power DC integration system:

[0082] The supercapacitor and distributed wind power DC integration system includes:

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

[0084] A third voltage conversion module, connected to the second circuit breaker, for converting voltage;

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

[0086] A third circuit breaker group, including a plurality of third circuit breakers, respectively connected to the second DC bus;

[0087] a fourth circuit breaker group, comprising a plurality of fourth circuit breakers, each of which is connected to the second DC bus;

[0088] a fourth voltage conversion module group, comprising a plurality of fourth voltage conversion modules, respectively connected to the plurality of third circuit breakers, for converting voltage;

[0089] a fifth voltage conversion module group, comprising a plurality of fifth voltage conversion modules, respectively connected to the plurality of fourth circuit breakers, for converting voltage;

[0090] A plurality of supercapacitors are respectively connected to the plurality of third circuit breakers through the fourth voltage conversion modules;

[0091] A plurality of distributed direct-drive wind turbine sets are respectively connected to the plurality of fourth circuit breakers through the fifth voltage conversion modules.

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

[0093] a unidirectional AC / DC commutation device connected to the second circuit breaker;

[0094] A transformer 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 plurality of groups of supercapacitors.

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

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

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

[0103] The vacuum magnetic levitation flywheel energy storage has a large specific power and low cost per unit power. Although the price per unit power of supercapacitor energy storage is higher than that of vacuum magnetic levitation flywheel energy storage, its charging and discharging efficiency can reach 97%, which is higher than the 90% of vacuum magnetic levitation flywheel energy storage. It is suitable for combination with distributed power generation systems as a supplementary energy supply; wind power DC integration technology uses power electronics technology to convert the AC power generated by wind turbines into DC power and stably integrate it into the power grid. Its power transmission process avoids the loss of converting DC power into AC power, thereby improving the energy conversion efficiency. It is usually applied to direct-drive or semi-direct-drive wind turbines. This technology combined with energy storage can further improve the utilization rate of new energy. Therefore, the combination of supercapacitors and distributed wind power DC integration technology can effectively avoid the loss of converting DC power into AC power, so that the entire system can reduce the power consumption of the train and reduce equipment costs.

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

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

[0106] When a train brake signal is received:

[0107] Controlling the first circuit breaker to remain in a closed state so that the braking electric energy output by the train driving and braking system is transmitted to the vacuum magnetic levitation flywheel energy storage device for storage;

[0108] The second circuit breaker is controlled to remain in an open state, and the third circuit breaker group and the fourth circuit breaker group are controlled to remain in a closed state, so that the multiple distributed direct-drive wind turbine groups charge the multiple supercapacitors.

[0109] In some embodiments, the train traction motor will be used as a brake motor during the braking process, converting the train braking energy into electrical energy and transmitting it to the 1500V DC bus; after the control system receives the train braking signal, it controls the first circuit breaker to remain in a closed state, converts the 1500V DC power into AC power through a bidirectional AC / DC converter, and then reduces the voltage of the AC power through a high-frequency transformer, and transmits the electrical energy to a vacuum magnetic levitation flywheel energy storage device for storage.

[0110] During the braking process of the train, the control system controls the second circuit breaker to remain in the disconnected state, and the supercapacitor and the distributed wind power DC integration system are disconnected from the train drive and braking system; the third circuit breaker group and the fourth circuit breaker group remain in the closed state, and the distributed direct-drive wind turbine group converts AC power into DC power through a unidirectional AC / DC converter and transmits it to the 800V DC bus, and charges the supercapacitor through the 800V DC bus.

[0111] In a specific embodiment, the train traction motor (1-1) is used as a brake motor during braking, and part of the braking energy can be converted into electric energy through the brake motor, with a braking power of ≤2000kW, and the electric 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 in a closed state, converts the 1500V DC power into AC power through the bidirectional AC / DC converter (2-2), and then reduces the AC power to 690V through the high-frequency transformer (2-3), and transmits the electric energy to the vacuum magnetic levitation flywheel energy storage device (2-4) for storage.

[0112] During the train braking process, the control system (4) controls the second circuit breaker (3-1) to remain in an open state, and the supercapacitor and the distributed wind power DC integration 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 in a closed state, and the distributed direct-drive wind turbine group (3-11) converts alternating current into direct current 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 receiving the train start signal:

[0114] Controlling the first circuit breaker to remain in a closed state, and controlling the vacuum magnetic levitation flywheel energy storage device to deliver electric energy to the train driving and braking system;

[0115] The second circuit breaker, the third circuit breaker group and the fourth circuit breaker group are controlled to remain in a closed state, and the multiple distributed direct-drive wind turbine groups and the multiple supercapacitors are controlled to transmit 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-up signal, the first circuit breaker remains closed, the electric energy stored in the vacuum magnetic levitation flywheel energy storage device is boosted by a high-frequency transformer, and then the alternating current is converted into 1500V direct current through a bidirectional AC / DC converter, and the electric energy is transmitted to the 1500V DC bus to supply power to the train traction motor.

[0117] Since the electric energy required for train starting is greater than the electric energy recovered by braking and the flywheel energy storage system has certain losses during the charging and discharging process, supercapacitors and distributed wind power DC integration system are needed to supplement the insufficient electric energy. The control system controls the second circuit breaker, the third circuit breaker group, and the fourth circuit breaker group to remain in a closed state. The distributed direct-drive wind turbine group converts AC power into DC power through a unidirectional AC / DC converter and transmits it to the 800V DC bus. The electric energy stored in the supercapacitor is transmitted to the 800V DC bus through a bidirectional DC / DC converter; the 800V DC power is converted into 1500V DC power through a unidirectional DC / AC converter, a transformer, and a unidirectional AC / DC converter in turn, and the electric energy is transmitted to the 1500V DC bus to supply power to the train traction motor. If the electric energy supplied by the supercapacitor and the distributed wind power DC integration system is still insufficient, it will be provided by the power grid.

[0118] In a 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 in a closed state, the electric energy stored in the vacuum magnetic suspension flywheel energy storage device (2-4) is boosted by the high-frequency transformer (2-3), and then the alternating current is converted into 1500V direct current by the bidirectional AC / DC converter (2-2), and the electric energy is transmitted to the 1500V direct current 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 in a closed state; the distributed direct-drive wind turbine group (3-11) converts alternating current into direct current through a unidirectional AC / DC converter (3-10) and transmits the converted alternating current to an 800V direct current bus (3-5); the electric energy stored in the supercapacitor (3-8) is transmitted to the 800V direct current bus (3-5) through a bidirectional DC / DC converter (3-7); the 800V direct current is sequentially converted into 1500V direct current through a unidirectional DC / AC converter (3-4), a transformer (3-3), and a unidirectional AC / DC converter (3-2); the electric energy is transmitted to the 1500V direct current 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 2600 kW, which is less than the train motor power, so the insufficient power is provided by the power grid.

[0120] When receiving a train running signal:

[0121] Controlling the first circuit breaker to remain in an open state;

[0122] The second circuit breaker and the fourth circuit breaker group are controlled to remain in a closed state, the third circuit breaker group is controlled to remain in an open state, and the multiple distributed direct-drive wind turbine groups and the power grid are controlled to transmit electrical energy to the train drive and braking system.

[0123] In some embodiments, during the operation of the train, the train traction motor is used as a motor to pull the train. After the control system receives the train start signal, the first circuit breaker remains in the disconnected state, and the flywheel energy storage system stops being used.

[0124] The control system controls the second circuit breaker and the fourth circuit breaker group to remain in a closed state. The distributed direct-drive wind turbine group converts AC power into DC power through a unidirectional AC / DC converter and transmits it to the 800V DC bus. The 800V DC power is converted into 1500V DC power through a unidirectional DC / AC converter, a transformer, and a unidirectional AC / DC converter in turn, and the power is transmitted to the 1500V DC bus to supply power to the train traction motor. The power of the distributed direct-drive wind turbine group is less than the power required by the traction motor when the train is operating normally, and the remaining power is provided by the power grid.

[0125] The control system controls the third circuit breaker group to remain in an open state, and the supercapacitor stops being used.

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

[0127] The control system (4) controls the second circuit breaker (3-1) and the fourth circuit breaker group (3-9) to remain in a closed state, and the distributed direct-drive wind turbine group (3-11) converts the alternating current into direct current through the unidirectional AC / DC converter (3-10) and transmits it to the 800V DC bus (3-5). The 800V DC is successively converted into 1500V DC through the unidirectional DC / AC converter (3-4), the transformer (3-3), and the unidirectional AC / DC converter (3-2), and the electric energy 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 group (3-11) is 300kW, which is less than the power required by the traction motor during normal operation of the train, the remaining electric energy is provided by the power grid.

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

[0129] When a train stop signal is received:

[0130] Controlling the first circuit breaker to remain in an open state;

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

[0132] In a specific embodiment, during the train braking process, the control system (4) controls the first circuit breaker (2-1) and the third circuit breaker group (3-6) to maintain an open state, and the flywheel energy storage system (2) and the super capacitor (3-8) are disconnected from the train drive and braking system (1). The circuit breaker (3-1) and the circuit breaker (3-9) are controlled to maintain a closed state, and the distributed direct-drive wind turbine group (3-11) transmits power to the power grid through the 800V DC bus (3-5) and the 1500V DC bus (1-3) in turn.

[0133] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A rail transit train start-stop charging and discharging system, characterized in that: include: Train driving and braking systems, used to drive or brake the train; A flywheel energy storage system connected to the train drive and brake system for storing electric energy during the train braking process and transmitting electric energy to the train drive and brake system during the train starting process; A supercapacitor and distributed wind power direct current incorporation system, connected to the train drive and brake system, comprising a plurality of supercapacitors and a plurality of distributed direct-drive wind turbines connected in parallel, for charging the plurality of supercapacitors connected in parallel during train braking, and for delivering electrical energy to the train drive and brake system during train startup and operation; A control system is connected to the supercapacitor and distributed wind power 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 integration system to work according to the train signals.

2. The rail transit train start-stop charging and discharging system according to claim 1, characterized in that: The train driving and braking system comprises: Train traction motor, used as a brake motor during train braking and as a motor during train starting and running; A first voltage conversion module, connected to the train traction motor, for converting voltage; The first DC bus is connected to the first voltage conversion module.

3. The rail transit train start-stop charging and discharging system according to claim 2, characterized in that: The flywheel energy storage system comprises: A first circuit breaker connected to the first DC bus; A second voltage conversion module, connected to the first circuit breaker, for converting 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 device 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 3, characterized in that: The supercapacitor and distributed wind power direct current integration system comprises: a second circuit breaker connected to the first DC bus; A third voltage conversion module, connected to the second circuit breaker, for converting voltage; A second DC bus connected to the third voltage conversion module; A third circuit breaker group, including a plurality of third circuit breakers, respectively connected to the second DC bus; a fourth circuit breaker group, comprising a plurality of fourth circuit breakers, each of which is connected to the second DC bus; a fourth voltage conversion module group, comprising a plurality of fourth voltage conversion modules, respectively connected to the plurality of third circuit breakers, for converting voltage; a fifth voltage conversion module group, comprising a plurality of fifth voltage conversion modules, respectively connected to the plurality of fourth circuit breakers, for converting voltage; A plurality of supercapacitors are respectively connected to the plurality of third circuit breakers through the fourth voltage conversion modules; A plurality of distributed direct-drive wind turbine sets are respectively connected to the plurality of fourth circuit breakers through the fifth voltage conversion modules.

6. According to the rail transit train start-stop charging and discharging system of claim 5, the third voltage conversion module comprises: a unidirectional AC / DC commutation device connected to the second circuit breaker; A transformer connected to the unidirectional AC / DC converter; A unidirectional DC / AC converter is connected to the transformer and the second DC bus.

7. The rail transit train start-stop charging and discharging system according to claim 5, characterized in that: The control method of the control system comprises: When a train brake signal is received: Controlling the first circuit breaker to remain in a closed state so that the braking electric energy output by the train driving and braking system is transmitted to the vacuum magnetic levitation flywheel energy storage device for storage; The second circuit breaker is controlled to remain in an open state, and the third circuit breaker group and the fourth circuit breaker group are controlled to remain in a closed state, so that the multiple distributed direct-drive wind turbine groups charge the multiple supercapacitors.

8. The rail transit train start-stop charging and discharging system according to claim 5, characterized in that: The control method of the control system comprises: When receiving the train start signal: Controlling the first circuit breaker to remain in a closed state, and controlling the vacuum magnetic levitation flywheel energy storage device to deliver electric energy to the train driving and braking system; The second circuit breaker, the third circuit breaker group and the fourth circuit breaker group are controlled to remain in a closed state, and the multiple distributed direct-drive wind turbine groups and the multiple supercapacitors are controlled to transmit electrical energy to the train drive and braking system.

9. The rail transit train start-stop charging and discharging system according to claim 5, characterized in that: The control method of the control system comprises: When receiving a train running signal: Controlling the first circuit breaker to remain in an open state; The second circuit breaker and the fourth circuit breaker group are controlled to remain in a closed state, the third circuit breaker group is controlled to remain in an open state, and the multiple distributed direct-drive wind turbine groups and the power grid are controlled to transmit electrical energy to the train drive and braking system.

10. The rail transit train start-stop charging and discharging system according to claim 5, characterized in that: The control method of the control system comprises: When a train stop signal is received: Controlling the first circuit breaker to remain in an open state; The third circuit breaker group is controlled to remain in an open state, the second circuit breaker group and the fourth circuit breaker group are controlled to remain in a closed state, and the multiple distributed direct-drive wind turbine groups are controlled to transmit electric energy to the power grid.

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