Rail transit energy-saving system based on flywheel energy storage and rail transit

Abstract

The embodiment of the utility model discloses a rail transit energy-saving system based on flywheel energy storage and rail transit, the system comprises a flywheel management controller, an AC-to-DC unit and at least two groups of flywheel energy storage systems, and each group of flywheel energy storage system comprises a control unit and a flywheel energy storage unit; the flywheel management controller is electrically connected with the control unit; the control unit is used for being electrically connected with a direct current bus; in the same flywheel energy storage system, the control unit is electrically connected with the flywheel energy storage unit and can control the flywheel energy storage unit to work. The input end of the AC-to-DC unit is used for being electrically connected with a rail transit AC power grid, and the output end of the AC-to-DC unit is used for being electrically connected with a DC bus. Therefore, the control logic of the control unit is simplified, the data processing workload of the flywheel management controller is reduced, the processing period is shortened, and the real-time control response is improved.

Description

Technical Field

[0001] The present application relates to the field of electrical control technology, and in particular to a rail transit energy-saving system and rail transit based on flywheel energy storage. Background Art

[0002] In the existing flywheel energy storage systems used in rail transit, generally only one controller is configured to collect control data and send it to multiple power cabinets to control and drive the operation of multiple flywheels; a monitoring system is configured to communicate with multiple power cabinets, and the information of multiple power cabinets needs to be collected and summarized. This increases the complexity of the controller's control logic, and when problems arise, the speed of eliminating and solving problems is slow; the monitoring system needs to collect information from each power cabinet first, and then summarize it, which requires a large amount of data processing and prolongs the processing cycle. Utility Model Content

[0003] In view of this, the present application provides a rail transit energy-saving system and rail transit based on flywheel energy storage, which are used to solve the problem that in the flywheel energy storage system applied to rail transit in the prior art, the complexity of the control logic of the controller is increased, and when problems occur, the speed of eliminating and solving the problems is slow, and the monitoring system needs to collect information from each power cabinet first and then summarize it, which results in a large amount of data processing workload and prolongs the processing cycle. In order to achieve one or part or all of the above purposes or other purposes, on the one hand, the present application proposes a rail transit energy-saving system based on flywheel energy storage, the system comprising: a flywheel management controller, an AC to DC unit and at least two groups of flywheel energy storage systems, each group of the flywheel energy storage systems comprising: a control unit and a flywheel energy storage unit;

[0004] The flywheel management controller is electrically connected to the control unit;

[0005] The control unit is used to be electrically connected to the DC bus;

[0006] In the same group of flywheel energy storage systems, the control unit is electrically connected to the flywheel energy storage unit and can control the operation of the flywheel energy storage unit;

[0007] The input end of the AC-DC unit is used to be electrically connected to the rail transit AC power grid, and the output end of the AC-DC unit is used to be electrically connected to the DC bus.

[0008] Further, the control unit includes: a system control module, a power cabinet, a magnetic bearing control module and an electrical switch module;

[0009] The flywheel management controller is electrically connected to the system control module;

[0010] The system control module is electrically connected to the power cabinet and the magnetic bearing control module;

[0011] The magnetic bearing control module is connected to the flywheel energy storage unit and can control the suspension of the flywheel rotor in the flywheel energy storage unit;

[0012] The electrical switch module includes: a DC incoming line isolating switch, a DC positive switch, and a DC negative switch;

[0013] The system control module is electrically connected to the DC line isolating switch, the DC positive switch, and the DC negative switch;

[0014] The first end of the DC line isolating switch is electrically connected to the DC bus, and the second end of the DC line isolating switch is electrically connected to the first end of the DC positive switch and the first end of the DC negative switch;

[0015] The first end of the power cabinet is electrically connected to the second end of the DC positive switch and the second end of the DC negative switch, and the second end of the power cabinet is electrically connected to the flywheel energy storage unit.

[0016] Furthermore, the electrical switch module further comprises: a three-phase AC outgoing line switch;

[0017] The second end of the power cabinet is electrically connected to the first end of the three-phase AC outgoing switch;

[0018] The second end of the three-phase AC outgoing line switch is electrically connected to the flywheel energy storage unit.

[0019] Further, the flywheel energy storage unit comprises: a flywheel energy storage motor and a flywheel body, and the flywheel body comprises: a flywheel rotor;

[0020] The power cabinet is electrically connected to the flywheel body through the three-phase AC outlet switch and can control the operation of the flywheel energy storage motor;

[0021] The flywheel energy storage motor and the flywheel rotor;

[0022] The magnetic bearing control module is used to control the suspension of the flywheel rotor.

[0023] Further, the system further comprises: a first DC power supply and a second DC power supply;

[0024] The first DC power supply is used to supply power to the DC inlet disconnect switch, the DC positive switch and the DC negative switch;

[0025] The second DC power supply is used to supply power to the flywheel management controller, the three-phase AC outlet switch and the system control module.

[0026] Furthermore, the system also includes a display screen, and the flywheel management controller is electrically connected to the display screen.

[0027] Furthermore, the flywheel management controller is connected to each of the system control modules and the display screen via Ethernet, and the system control module is connected to the power cabinet and the magnetic bearing control module via Ethernet.

[0028] Further, the system further comprises: an auxiliary unit;

[0029] The flywheel management controller is electrically connected to the auxiliary unit;

[0030] The auxiliary unit is used to provide auxiliary functions to each of the flywheel energy storage units in each group of the flywheel energy storage system.

[0031] Furthermore, the auxiliary unit includes: a vacuum pump, an air conditioner, a chiller and an automatic resistance box, and the flywheel management controller is electrically connected to the vacuum pump, the air conditioner, the chiller and the automatic resistance box.

[0032] On the other hand, a rail transit is proposed, comprising: a DC bus and a rail transit energy-saving system based on flywheel energy storage as described in any one of the above items.

[0033] Implementing the embodiments of the present application will have the following beneficial effects:

[0034] The rail transit energy-saving system based on flywheel energy storage of the present application includes: a flywheel management controller, an AC-to-DC unit and at least one group of flywheel energy storage systems, each group of the flywheel energy storage systems includes: a control unit and a flywheel energy storage unit; the flywheel management controller is electrically connected to each of the control units; the control unit is electrically connected to the DC bus; in the same group of flywheel energy storage systems, the control unit is electrically connected to the flywheel energy storage unit and can control the operation of the flywheel energy storage unit; the input end of the AC-to-DC unit is electrically connected to the rail transit AC power grid, and the output end of the AC-to-DC unit is electrically connected to the DC bus. Thus, the control unit and the flywheel energy storage unit correspond one-to-one, simplifying the control logic of the control unit, and when problems occur, the speed of eliminating and solving problems can be improved; the control unit of each group of flywheel energy storage systems preferentially collects and summarizes the operating data of the flywheel energy storage units of this group, and finally summarizes it through the flywheel management controller, reducing the workload of the flywheel management controller in processing data and shortening the processing cycle; each control unit separately collects the voltage of the DC power output by the AC-to-DC unit, improving the real-time control response. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] in:

[0037] Figure 1 It is a structural schematic diagram of a rail transit energy-saving system based on flywheel energy storage in one embodiment;

[0038] Figure 2 A detailed structural diagram of a rail transit energy-saving system based on flywheel energy storage according to the present application;

[0039] Figure 3 Another detailed structural schematic diagram of the rail transit energy-saving system based on flywheel energy storage of the present application. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] See also Figure 1 , the present application proposes a rail transit energy-saving system based on flywheel energy storage, the system comprising: a flywheel management controller 1, an AC to DC unit 3 and at least two groups of flywheel energy storage systems 2, each group of the flywheel energy storage system 2 comprising: a control unit 21 and a flywheel energy storage unit 22;

[0042] The flywheel management controller 1 is electrically connected to the control unit 21;

[0043] The control unit 21 is used to be electrically connected to the DC bus;

[0044] In the same group of the flywheel energy storage system 2, the control unit 21 is electrically connected to the flywheel energy storage unit 22 and can control the flywheel energy storage unit 22 to work;

[0045] The input end of the AC-DC unit 3 is used to be electrically connected to the rail transit AC power grid 8, and the output end of the AC-DC unit 3 is used to be electrically connected to the DC bus.

[0046] This embodiment makes the control unit 21 and the flywheel energy storage unit 22 correspond one to one, simplifies the control logic of the control unit 21, and can improve the speed of eliminating and solving problems when problems occur; the control unit 21 of each group of flywheel energy storage systems 2 gives priority to collecting and summarizing the operating data of the flywheel energy storage units 22 of this group, and finally summarizes them through the flywheel management controller 1, reducing the workload of the flywheel management controller 1 in processing data and shortening the processing cycle; each control unit 21 separately collects the voltage of the DC power output by the AC-DC unit 3, thereby improving the real-time control response.

[0047] The flywheel management controller 1 adopts an FMS controller. The FMS (Chinese name is flywheel management system) controller is an automatic control system based on computer technology. By combining with computer hardware and software, it realizes real-time monitoring, data collection, data processing and control of the production process. The flywheel management controller 1 is mainly composed of controller hardware, input and output interfaces, communication interfaces and control software. The flywheel management controller 1 is used to manage the array formed by multiple flywheel energy storage systems 2 and auxiliary equipment.

[0048] In the present application, the flywheel management controller 1 is used to send an opening instruction or a closing instruction to each control unit 21 and collect and summarize the data of each control unit 21.

[0049] The AC to DC unit 3 is used to convert the 380V AC power input from the rail transit AC power grid 8 into 1500V DC power.

[0050] The DC bus is used to supply power to the electrical devices of rail transit vehicles for vehicle operation. The DC bus includes a +1500V DC line and a -1500V DC line. Figure 1 The DC +1500V in the circuit is a +1500V DC line. Figure 1 The DC -1500V in it is a -1500V DC line.

[0051] The control unit 21 enters a working state upon receiving a start instruction from the flywheel management controller 1 , and then in the working state, controls the flywheel energy storage unit 22 to operate based on the change in the voltage of the DC power input by the AC to DC unit 3 .

[0052] The flywheel energy storage unit 22 is an energy storage system based on a flywheel.

[0053] The working principle of the rail transit energy-saving system based on flywheel energy storage is as follows: when the rail transit vehicle is in motion, the rail transit vehicle will draw electricity from the rail transit AC power grid 8 to maintain operation; when the rail transit vehicle enters the station and brakes, the rail transit vehicle requires less electric energy than the electric energy required for driving. At this time, the voltage of the DC power output by the AC-DC unit 3 increases. When the voltage is greater than the charging voltage, the control unit 21 controls the flywheel energy storage unit 22 to charge, so as to recover the electric energy reduced by braking; when the rail transit vehicle leaves the station and starts, the rail transit vehicle requires more electric energy than the electric energy required for driving. At this time, the voltage of the DC power output by the AC-DC unit 3 decreases. When the voltage is less than the discharge voltage, the control unit 21 controls the flywheel energy storage unit 22 to release electric energy to the DC bus, thereby supplying the rail transit vehicle with starting energy.

[0054] See also Figure 2 In one embodiment, the control unit 21 includes: a system control module 211, a power cabinet 213, a magnetic bearing control module 212 and an electrical switch module;

[0055] The flywheel management controller 1 is electrically connected to the system control module 211;

[0056] The system control module 211 is electrically connected to the power cabinet 213 and the magnetic bearing control module 212;

[0057] The magnetic bearing control module 212 is connected to the flywheel energy storage unit 22 and can control the suspension of the flywheel rotor in the flywheel energy storage unit 22;

[0058] The electrical switch module includes: a DC incoming line isolating switch QF, a DC positive switch KM1, and a DC negative switch KM2;

[0059] The system control module 211 is electrically connected to the DC inlet disconnect switch QF, the DC positive switch KM1, and the DC negative switch KM2;

[0060] The first end of the DC incoming line isolating switch QF is electrically connected to the DC bus, and the second end of the DC incoming line isolating switch QF is electrically connected to the first end of the DC positive switch KM1 and the first end of the DC negative switch KM2;

[0061] The first end of the power cabinet 213 is electrically connected to the second end of the DC positive switch KM1 and the second end of the DC negative switch KM2 , and the second end of the power cabinet 213 is electrically connected to the flywheel energy storage unit 22 .

[0062] The control unit 21 can be isolated from or connected to the DC busbar by means of the DC line disconnector QF.

[0063] The system control module 211 is used to receive and record data from the power cabinet 213 and the magnetic bearing control module 212, control the electrical switch module, and control the operation of the flywheel motor and the magnetic bearing of the flywheel energy storage unit 22. It can be understood that the system control module 211 is a system control unit of the flywheel energy storage system.

[0064] The power cabinet 213 is used to control the operation of the flywheel motor of the flywheel body of the flywheel energy storage unit 22 and collect the status data of the flywheel motor. The power cabinet 213 is provided with a current conversion module, which is a DC and AC bidirectional converter.

[0065] The magnetic bearing control module 212 is used to control the operation of the magnetic bearing of the flywheel body of the flywheel energy storage unit 22 and collect the status data of the magnetic bearing.

[0066] Each electrical switch module is integrated in the electrical component control cabinet.

[0067] In the same control unit 21 , the system control module 211 controls the operation of the DC inlet disconnect switch QF, the DC positive switch KM1 , the DC negative switch KM2 and the three-phase AC outlet switch CB.

[0068] The DC incoming line disconnector QF adopts a DC disconnector. The DC disconnector is a device that prevents the DC disconnector from AC and DC short circuits.

[0069] A first end of the DC incoming line disconnector QF is electrically connected to the neutral line and the live line of the rail transit AC power grid 8 .

[0070] Both the DC positive switch KM1 and the DC negative switch KM2 are bidirectional switches.

[0071] See also Figure 3 , In one embodiment, the electrical switch module further comprises: a three-phase AC outgoing line switch CB;

[0072] The second end of the power cabinet 213 is electrically connected to the first end of the three-phase AC outgoing line switch CB;

[0073] A second end of the three-phase AC outgoing line switch CB is electrically connected to the flywheel energy storage unit 22 .

[0074] The existing flywheel energy storage system used in rail transit is not equipped with a three-phase AC output switch CB. When the flywheel of the flywheel energy storage unit 22 operates abnormally, the connection between the power cabinet 213 and the flywheel energy storage unit 22 cannot be cut off in time, which may cause damage to the power cabinet 213. In order to solve this problem, this embodiment is provided with a three-phase AC output switch CB in each control unit 21. When the flywheel operates abnormally, the three-phase AC output switch CB can be cut off in time, thereby cutting off the electrical connection between the power cabinet 213 and the flywheel energy storage unit 22, thereby protecting the power cabinet 213 and preventing the power cabinet 213 from being damaged.

[0075] The three-phase AC outgoing line switch CB adopts a three-phase line switch.

[0076] In one embodiment, the flywheel energy storage unit 22 includes: a flywheel energy storage motor and a flywheel body, and the flywheel body includes: a flywheel rotor;

[0077] The power cabinet 213 is electrically connected to the flywheel body through the three-phase AC outlet switch CB, and can control the operation of the flywheel energy storage motor;

[0078] The flywheel energy storage motor and the flywheel rotor;

[0079] The magnetic bearing control module 212 is used to control the suspension of the flywheel rotor.

[0080] The flywheel energy storage unit 22 includes a flywheel body, which includes: a flywheel, a magnetic bearing, a flywheel energy storage motor, a flywheel rotor, a flywheel stator, a vacuum chamber, etc. The implementation method and connection method of each component of the flywheel body can be selected from the existing technology and will not be described here.

[0081] Among them, when the rail transit vehicle enters the station and brakes, the voltage of the DC power output by the AC-DC unit 3 increases (that is, the DC side bus voltage increases). When the voltage is greater than the charging voltage, the control unit 21 controls the flywheel energy storage unit 22 to charge; when the rail transit vehicle leaves the station and starts, the voltage of the DC power output by the AC-DC unit 3 decreases (that is, the DC side bus voltage decreases). When the voltage is less than the discharge voltage, the control unit 21 controls the flywheel energy storage unit 22 to release electrical energy to the DC bus.

[0082] See also Figure 2 and Figure 3 , in one embodiment, the system further comprises: a first DC power supply 41 and a second DC power supply 42;

[0083] The first DC power supply 41 is used to supply power to the DC inlet disconnect switch QF, the DC positive switch KM1 and the DC negative switch KM2;

[0084] The second DC power supply 42 is used to supply power to the flywheel management controller 1 , the three-phase AC outgoing line switch CB and the system control module 211 .

[0085] Optionally, the first DC power supply 41 outputs 110V DC power.

[0086] Optionally, the second DC power supply 42 outputs 24V DC power.

[0087] It is understandable that a power supply may also be powered by two ports, one of which outputs 110V DC power and the other outputs 24V DC power. The 110V DC power output is used to power the DC incoming line disconnector QF, the DC positive switch KM1 and the DC negative switch KM2, and the 24V DC power output is used to power the flywheel management controller 1, the three-phase AC outgoing line switch CB and the system control module 211.

[0088] See also Figure 2 and Figure 3 In one embodiment, the system further includes a display screen 5 , and the flywheel management controller 1 is electrically connected to the display screen 5 .

[0089] The flywheel management controller 1 displays the collected data in a preset display mode. The display screen 5 mainly displays the status data of the flywheel motor, magnetic bearing, voltage, and electrical switch module.

[0090] Optionally, the second DC power supply 42 outputs 24V DC power to the display screen 5 .

[0091] In one embodiment, the flywheel management controller 1 is connected to each of the system control modules 211 and the display screen 5 via Ethernet, and the system control module 211 is connected to the power cabinet 213 and the magnetic bearing control module 212 via Ethernet.

[0092] The existing flywheel energy storage system applied to rail transit adopts CAN communication, and the real-time response rate of CAN communication is slow. If there is electromagnetic interference on site, the CAN communication data will be slowly sent or lost, which will seriously affect the control of the flywheel by the power cabinet 213. In order to solve this problem, this embodiment adopts Ethernet communication. The communication rate of Ethernet communication (Ethernet communication) can be 10M / s, which is greatly improved compared with CAN communication 250KB / s. Moreover, compared with CAN communication, Ethernet communication has stronger anti-interference ability, which is conducive to ensuring the stability of the rail transit energy-saving system based on flywheel energy storage.

[0093] The physical communication form of CAN transmits data through the voltage difference generated by two communication lines (twisted pair). All nodes in a CAN network are connected to these two communication lines and use differential signal half-duplex communication.

[0094] Ethernet communication, also known as Ethernet communication. Ethernet is a baseband local area network technology. Ethernet communication is a communication method that uses coaxial cable as network media, adopts carrier multiple access and collision detection mechanism, and has a data transmission rate of 1Gbit / s, which can meet the needs of non-continuous network data transmission.

[0095] In one embodiment, the system further comprises: an auxiliary unit;

[0096] The flywheel management controller 1 is electrically connected to the auxiliary unit;

[0097] The auxiliary unit is used to provide auxiliary functions to each of the flywheel energy storage units 22 in each group of the flywheel energy storage system 2.

[0098] In the existing flywheel energy storage system applied to rail transit, an auxiliary unit is set for each flywheel, resulting in a large number of sub-equipment and occupying a large space. In order to solve this problem, this embodiment realizes that each flywheel energy storage unit 22 shares an auxiliary unit, reducing the sub-equipment, and integrating the control of the auxiliary unit through the flywheel management controller 1, thereby improving the control efficiency.

[0099] In one embodiment, the auxiliary unit includes: a vacuum pump, an air conditioner, a chiller and an automatic resistance box, and the flywheel management controller 1 is electrically connected to the vacuum pump, the air conditioner, the chiller and the automatic resistance box.

[0100] The flywheel management controller 1 controls the operation of the vacuum pump, the air conditioner, the chiller and the automatic resistance box.

[0101] The automatic resistance box is used to control the flywheel deceleration. The air conditioner is used to control the temperature of the working environment of the flywheel energy storage unit 22.

[0102] The present application also proposes a rail transit, which includes: a DC bus and a rail transit energy-saving system based on flywheel energy storage as described in any one of the above items.

[0103] The rail transit in the present application is a rail transit vehicle, which draws power from a DC bus to maintain operation.

[0104] This embodiment makes the control unit 21 and the flywheel energy storage unit 22 correspond one to one, simplifies the control logic of the control unit 21, and can improve the speed of eliminating and solving problems when problems occur; the control unit 21 of each group of flywheel energy storage systems 2 gives priority to collecting and summarizing the operating data of the flywheel energy storage units 22 of this group, and finally summarizes them through the flywheel management controller 1, reducing the workload of the flywheel management controller 1 in processing data and shortening the processing cycle; each control unit 21 separately collects the voltage of the DC power output by the AC-DC unit 3, thereby improving the real-time control response.

[0105] When the flywheel operates normally, the flywheel management controller 1 turns on the auxiliary unit and sends a turn-on instruction to the system control module 211 of each of the control units 21 .

[0106] In the same control unit 21 , the system control module 211 individually closes the DC incoming disconnect switch QF, the DC positive switch KM1 , the DC negative switch KM2 and the three-phase AC outgoing switch CB in the electrical switch module of the control unit 21 .

[0107] In the same control unit 21, the system control module 211 sends control instructions and control parameters to the magnetic bearing control module 212, and the flywheel rotor is suspended by the magnetic bearing control module 212. The system control module 211 sends control parameters to the power cabinet 213, and the power cabinet 213 controls the operation of the flywheel.

[0108] When a rail transit vehicle enters a station and brakes, and the voltage of the DC power output by the AC-DC unit 3 is greater than the charging voltage, in the same control unit 21, the system control module 211 sends charging control parameters to the power cabinet 213, the power cabinet 213 controls the flywheel charging acceleration, and the system control module 211 collects and summarizes the operating parameters of the flywheel, thereby achieving recovery braking to reduce the use of electrical energy.

[0109] When a rail transit vehicle leaves a station and starts, and the voltage of the DC power output by the AC-DC unit 3 is less than the discharge voltage, in the same control unit 21, the system control module 211 sends the discharge control parameters to the power cabinet 213, the power cabinet 213 controls the flywheel discharge deceleration, and the system control module 211 collects and summarizes the operating parameters of the flywheel, thereby releasing electrical energy to the DC bus.

[0110] When the flywheel is abnormal, the system control module 211 of the flywheel energy storage system 2 to which the flywheel belongs sends a shutdown command to the power cabinet 213 of the flywheel energy storage system 2 to which the flywheel belongs, and the power cabinet 213 controls the flywheel to shut down. The system control module 211 disconnects the three-phase AC outlet switch CB of the flywheel energy storage system 2 to which the flywheel belongs separately, and protects the power cabinet 213 of the flywheel energy storage system 2 to which the flywheel belongs, while the flywheels of other flywheel energy storage systems 2 continue to operate normally. In other words, each flywheel energy storage system 2 of the present application is independently controlled and operated, which reduces the complexity and simplifies the control logic.

[0111] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A rail transit energy-saving system based on flywheel energy storage, characterized in that: The system comprises: a flywheel management controller, an AC to DC unit and at least two groups of flywheel energy storage systems, each group of the flywheel energy storage system comprises: a control unit and a flywheel energy storage unit; The flywheel management controller is electrically connected to the control unit; The control unit is used to be electrically connected to the DC bus; In the same group of flywheel energy storage systems, the control unit is electrically connected to the flywheel energy storage unit and can control the operation of the flywheel energy storage unit; The input end of the AC-DC unit is used to be electrically connected to the rail transit AC power grid, and the output end of the AC-DC unit is used to be electrically connected to the DC bus.

2. The rail transit energy-saving system based on flywheel energy storage according to claim 1, characterized in that: The control unit includes: a system control module, a power cabinet, a magnetic bearing control module and an electrical switch module; The flywheel management controller is electrically connected to the system control module; The system control module is electrically connected to the power cabinet and the magnetic bearing control module; The magnetic bearing control module is connected to the flywheel energy storage unit and can control the suspension of the flywheel rotor in the flywheel energy storage unit; The electrical switch module includes: a DC incoming line isolating switch, a DC positive switch, and a DC negative switch; The system control module is electrically connected to the DC line isolating switch, the DC positive switch, and the DC negative switch; The first end of the DC line isolating switch is electrically connected to the DC bus, and the second end of the DC line isolating switch is electrically connected to the first end of the DC positive switch and the first end of the DC negative switch; The first end of the power cabinet is electrically connected to the second end of the DC positive switch and the second end of the DC negative switch, and the second end of the power cabinet is electrically connected to the flywheel energy storage unit.

3. The rail transit energy-saving system based on flywheel energy storage as claimed in claim 2, characterized in that: The electrical switch module also includes: a three-phase AC outlet switch; The second end of the power cabinet is electrically connected to the first end of the three-phase AC outgoing switch; The second end of the three-phase AC outgoing line switch is electrically connected to the flywheel energy storage unit.

4. The rail transit energy-saving system based on flywheel energy storage as claimed in claim 3, characterized in that: The flywheel energy storage unit comprises: a flywheel energy storage motor and a flywheel body, and the flywheel body comprises: a flywheel rotor; The power cabinet is electrically connected to the flywheel body through the three-phase AC outlet switch and can control the operation of the flywheel energy storage motor; The flywheel energy storage motor and the flywheel rotor; The magnetic bearing control module is used to control the suspension of the flywheel rotor.

5. The rail transit energy-saving system based on flywheel energy storage as claimed in claim 3, characterized in that: The system further comprises: a first DC power supply and a second DC power supply; The first DC power supply is used to supply power to the DC inlet disconnect switch, the DC positive switch and the DC negative switch; The second DC power supply is used to supply power to the flywheel management controller, the three-phase AC outlet switch and the system control module.

6. The rail transit energy-saving system based on flywheel energy storage as claimed in claim 2, characterized in that: The system further comprises a display screen, and the flywheel management controller is electrically connected to the display screen.

7. The rail transit energy-saving system based on flywheel energy storage as claimed in claim 6, characterized in that: The flywheel management controller is connected to each of the system control modules and the display screen through Ethernet communication, and the system control module is connected to the power cabinet and the magnetic bearing control module through Ethernet communication.

8. The rail transit energy-saving system based on flywheel energy storage according to claim 1, characterized in that: The system further comprises: an auxiliary unit; The flywheel management controller is electrically connected to the auxiliary unit; The auxiliary unit is used to provide auxiliary functions to each of the flywheel energy storage units in each group of the flywheel energy storage system.

9. The rail transit energy-saving system based on flywheel energy storage as claimed in claim 8, characterized in that: The auxiliary unit comprises: a vacuum pump, an air conditioner, a chiller and an automatic resistance box, and the flywheel management controller is electrically connected to the vacuum pump, the air conditioner, the chiller and the automatic resistance box.

10. A rail transit, characterized in that: The rail transit comprises: a DC bus and a rail transit energy-saving system based on flywheel energy storage as described in any one of claims 1 to 9.

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