Electric traction accumulator for non-motorized metro car

Abstract

FIELD: accumulating electric energy.SUBSTANCE: invention relates to systems for accumulating electric energy during regenerative braking of railway urban passenger transport and can be used as a traction energy storage device for a non-motorized subway car. The subway car energy storage device consists of a battery cell block, a DC voltage converter that can convert electricity in both directions to control the charge and discharge of the battery cell block, an interface for connecting to the car's onboard network and the train's overall traction system, a control and diagnostic system, overload, overheating, and deep discharge protection, a housing, and auxiliary systems for ensuring its functionality. The body is a T-shaped hollow frame structure that can be installed in the undercarriage space of a non-motorized subway car. At the same time, a block of battery cells, a DC voltage converter, and auxiliary systems for ensuring the functioning are placed inside the housing, and the frame has a covering on the outside.EFFECT: technical result is to simplify the design of the subway car's energy storage device while ensuring its compactness and energy autonomy.7 cl, 3 dwg

Description

[0001] Field of technology to which the invention relates

[0002] The invention relates to systems for accumulating electrical energy during regenerative braking of urban railway passenger transport and can be used as a traction energy storage device for a non-motorized subway car.

[0003] Technology Level

[0004] A device for storing electrical energy for emergency traction power supply of electric rolling stock is known from the prior art (see RU 56736 U1, published 10.09.2006), comprising a DC power source connected via a switch to a charging device, which includes a dosing inductive reactor, a thyristor and a diode, an intermediate capacitive energy storage device, also connected via a switch to DC traction motors. In this case, the auxiliary power source, i.e., the vehicle's battery, is used as the initial power source. An intermediate capacitive energy storage device with a charging device, operating according to the electromagnetic choke circuit, is used to power the traction motors.The device can be used on powerful DC electric vehicles (trolleybuses, trams, metro cars and commuter train cars) for short-term traction power supply in cases of emergency train exit from a tunnel, shunting movements, etc., as well as for partial acceptance of recuperative energy.

[0005] The disadvantages of the analogue include the complexity of the design, low energy autonomy of the rolling stock, a long process of accumulating energy to power the rolling stock, due to the placement of batteries in each metro car and the need for a portioned transfer of energy to the traction motors from a capacitive energy storage device, which is also charged in portions from the batteries of the cars' own needs.

[0006] Also known from the prior art is a fully electric battery-powered locomotive and corresponding locomotive and train configurations (see CA 2845285 A1, published 04.11.2010). In one specific embodiment, the locomotive may be driven by a plurality of traction motors powered solely by a battery pack, which preferably includes rechargeable batteries or other energy storage means. The locomotive does not have an internal combustion engine and does not receive energy from any external sources during operation. A battery management system monitors and equalizes the charge of the batteries to maintain a desired charge level and depth of discharge for each battery. The braking system may be configured to prioritize the regenerative braking mechanism over the air brake, allowing a significant portion of the braking energy to be recovered for recharging the battery pack.

[0007] The disadvantages of the analogue include the complexity and bulkiness of the design, due to the design option of the energy storage device and its placement in a locomotive car or in the car space of a non-motor supply car.

[0008] The closest analogue, taken as a prototype, is a battery of electric energy storage devices with a distributed analytical control system (see RU 2561826 C2, published 10.09.2015), divided into modules containing blocks of individual storage devices connected in a series electrical circuit, an electronic equalizing device that provides active equalization of voltages on the individual storage devices of the module and is connected to each storage device of the module using an electrical harness that provides connection of the storage devices of the module to a microprocessor monitoring and control system, which, like the electronic equalizing device, is powered from the storage devices of the module, which contains an additional source of direct current used for recharging the battery unit, in the power circuit of which a current sensor is installed, the output signal of which is fed to the microprocessor monitoring and control system, connected with the same systems of other modules and with an external computer through a galvanically isolated serial multiplex communication channel.A switch, designed as a relay or electronic key with a fuse, is installed in the battery's power circuit. This switch enables the battery to be disconnected from an external charger or load connected to the battery's "+" and "-" terminals. Each module contains a temperature sensor connected to a microprocessor-based monitoring and control system, which is connected to a climate control unit with actuators in the form of dampers, heating elements, and fans, a power source with galvanic isolation from the battery storage units, an electronic equalizing device, and an additional DC power source in the form of a DC-DC converter connected to the DC busbars for recharging the modules and to the battery's AC-DC voltage converter, which is connected to an external AC network via a plug-in connector.The positive voltage bus for recharging the modules is connected to the battery switch via a diode, and the negative voltage bus for recharging the modules is connected to the negative terminal of the battery. The processor modules of the microprocessor-based monitoring and control system are selected with sufficient performance and memory capacity to perform expert analysis to assess the remaining life of the drives, diagnose them, and optimize charging based on statistical data obtained during battery operation.

[0009] The disadvantages of the prototype include the complexity and bulkiness of the battery of electric energy storage devices, due to the modularity of the used scheme, in which auxiliary systems for ensuring functioning are duplicated for each module.

[0010] The technical objective of the invention is to overcome the shortcomings of the existing level of technology.

[0011] When solving the technical problem, the invention achieves a technical result consisting in simplifying the design of the energy storage device of a subway car while simultaneously ensuring its compactness and energy autonomy of the rolling stock.

[0012] Disclosure of the essence of the invention

[0013] The invention is an electric power storage device for a subway car, consisting of a block of battery cells, a DC voltage converter, configured with the possibility of bidirectional conversion of electric power for controlling the charge-discharge of the block of battery cells, an interface for connecting to the on-board network of the car and to the general traction system of the train, a control and diagnostic system, protection against overloads, overheating and deep discharge, a housing and auxiliary systems for ensuring operation, wherein, according to the invention, the housing is a T-shaped hollow frame framework, configured with the possibility of installation in the undercar space of a non-motor subway car, wherein a block of battery cells, a DC voltage converter, auxiliary systems for ensuring operation are located inside the housing, and the frame has a sheathing on the outside.

[0014] The battery cell block is made in the form of cylindrical battery cells connected in series.

[0015] At the same time, the battery cell block can consist of 680 cells connected in 68 lines.

[0016] The DC / DC converter consists of a T-shaped hollow frame converter housing a resistor panel, power capacitors, a fire extinguishing system, voltage converters, a storage device disconnector with a fuse, a cooling system air duct with magnetic contactors, control units for the battery cell block and DC / DC converter, IGBT modules with a cooling radiator, a choke, a panel of power and information connectors, functionally connected by power copper buses.

[0017] Auxiliary systems for ensuring functioning are cooling and air filtration systems.

[0018] The cooling system is designed in the form of exhaust fans with dampers located in the lower part of the T-shaped frame.

[0019] The air filtration system is made in the form of filters installed on the air intake openings in the upper part of the T-shaped frame of the housing.

[0020] Brief description of accompanying figures

[0021] The essence of the invention is further explained by non-limiting examples reflected in the accompanying figures 1-3, which show: Fig. 1 - an external view of the energy storage device of a non-motorized subway car according to the invention without the sheathing of the body frame; Fig. 2 - an exploded diagram of the energy storage device of a non-motorized subway car according to the invention; Fig. 3 - an exploded diagram of the DC voltage converter of the energy storage device of a non-motorized subway car according to the invention.

[0022] Implementation of the invention

[0023] The invention is an electric energy storage device for a subway car, consisting of a block of battery cells 1, a DC voltage converter 2, designed with the possibility of bidirectional conversion of electric energy for controlling the charge-discharge of the block of battery cells 1, an interface 3 for connection to the on-board network of the car and to the general traction system of the train, a control and diagnostic system 4, protection against overloads, overheating and deep discharge, a housing 5 and auxiliary systems for ensuring operation.

[0024] Body 5 is a T-shaped hollow frame 6, designed for installation in the undercar space of a non-motorized subway car. The ability to install in the undercar space of a non-motorized subway car is determined by the optimal shape of the body and its overall dimensions, which allow for unimpeded installation due to the absence of drive electric motors, a current collection system from the contact rail, and auxiliary electric drive systems in the undercar space of a non-motorized car. The frame can be made, for example, from rolled steel sections welded to the required structural shape.

[0025] The housing 5 houses the battery pack 1, DC / DC converter 2, and auxiliary systems, while the frame 6 has a casing 7 on the outside. The casing 7 protects the storage device's structural components from damage caused by external factors and creates a relatively stable climatic environment within the housing. The casing can be made of either sheet metal or composite materials.

[0026] The battery cell unit 1 is preferably formed as cylindrical battery cells connected in series. In one embodiment, the battery cell unit consists of 680 cells connected in 68 lines of 10 cells each. The cylindrical nature of the storage cells allows for further improvement of the compactness of the proposed energy storage device. As a non-limiting example, the cylindrical storage cell can be formed from a hollow cylindrical steel housing closed on one side by a positive terminal cap and on the other by a negative terminal cover, with which a group of wound dry electrodes located inside the steel housing, separated by diaphragm paper, are in contact. The specific number of battery cells, as well as their number in lines, may vary, but the connection must always be in series.

[0027] Auxiliary systems for ensuring functioning are cooling and air filtration systems.

[0028] The cooling system is designed in the form of exhaust fans 8 with damper valves 9 located in the lower part of the T-shaped frame 6.

[0029] The air filtration system consists of filters 10 mounted on the air intake openings at the top of the T-shaped frame of the housing. Filters 10 can be integrated into the casing 7 of the frame 6.

[0030] The cooling and air filtration systems operate in concert, providing filtered cold air through filters 10. This air passes through the energy storage components, cooling them. The heated air is then exhausted outside the energy storage housing by exhaust fans 8. The volume of air passing through the energy storage can be further regulated by a gate valve 9.

[0031] The DC / DC converter 2 in the preferred embodiment consists of a T-shaped hollow frame 11 of the converter, in which a panel of resistors 12, power capacitors 13, a fire extinguishing system 14, voltage converters 15, a storage device disconnector 16 with a fuse 17, an air duct 18 of the cooling system with magnetic contactors 19, units 20 of the control system of the battery cell block 1 and the DC / DC converter 2, IGBT modules 21 with a cooling radiator, a choke 22, a panel of power and data connectors 23, functionally connected by power copper buses 24 are placed. To fence off the area of ​​the DC / DC converter 2 from the battery cell block 1, the T-shaped hollow frame 11 of the converter has an insulating wall 25 on one side.

[0032] The component composition of the DC / DC converter ensures a compact arrangement of its elements while ensuring the required energy autonomy of the rolling stock.

[0033] The energy storage device according to the invention operates as follows.

[0034] When the rolling stock is braking, the traction drive generates electricity, and the DC / DC converter converts the voltage and current to the level required to charge the battery cells. When stationary and with overhead contact, the DC / DC converter ensures controlled charging of the battery cells.

[0035] When accelerating the rolling stock, the energy storage device partially or completely provides power to the traction drive and auxiliary consumers, reducing the power consumption from the contact network, working in parallel with it, while the control system of the energy storage device analyzes the parameters of the contact network and regulates the power output by the energy storage device.

[0036] When there is no voltage in the contact network, the energy storage device supplies electricity to the traction drive of the rolling stock and auxiliary consumers, enabling the withdrawal of the subway car from the tunnel to the platform or autonomous movement on sections of the track without a contact network.

[0037] Thus, the component composition and specific design of the energy storage device make it possible to use it in a non-motorized subway car, overcome the shortcomings of the existing level of technology, simplify the design of such a storage device while simultaneously ensuring its compactness and energy autonomy of the rolling stock.

[0038] A search of publicly available information sources showed that the entire set of features of the proposed invention is not known and does not clearly follow from the prior art, and therefore the invention meets the patentability conditions of “novelty” and “inventive step”.

[0039] The claimed invention consists of materials and elements that are standard for this field of technology, that is, it can be used in industry, due to which the invention meets the patentability condition of “industrial applicability”.

[0040] It should be understood that after reviewing the above description and examples of the proposed invention, other changes, modifications, and embodiments of the invention will become apparent to those skilled in the art. Therefore, all such changes, modifications, and embodiments, as well as other applications that do not deviate from the essence of the present invention, should be considered protected by the present invention within the scope of the appended claims.

Claims

1. An electric energy storage device for a subway car, consisting of a block of battery cells, a DC voltage converter capable of bidirectional conversion of electric energy for controlling the charge-discharge of the block of battery cells, an interface for connection to the on-board network of the car and to the general traction system of the train, a control and diagnostic system, protection against overloads, overheating and deep discharge, a housing and auxiliary systems for ensuring operation, characterized in that the housing is a T-shaped hollow frame structure, made with the possibility of installation in the undercar space of a non-motor subway car, wherein the block of battery cells, the DC voltage converter, auxiliary systems for ensuring operation are located inside the housing, and the frame has a sheathing on the outside.

2. An electric energy storage device for a subway car according to paragraph 1, characterized in that the block of battery cells is made in the form of cylindrical battery cells connected in series.

3. An electric energy storage device for a subway car according to paragraph 2, characterized in that the block of battery cells consists of 680 cells connected in 68 lines.

4. An electric energy storage device for a subway car according to any one of paragraphs 1-3, characterized in that the DC voltage converter consists of a T-shaped hollow frame frame of the converter, in which a panel of resistors, power capacitors, a fire extinguishing system, voltage converters, a storage device disconnector with a fuse, an air duct of the cooling system with magnetic contactors, units of the control system for the battery cell block and the DC voltage converter, IGBT modules with a cooling radiator, a choke, a panel of power and information connectors, functionally connected by power copper buses, are placed.

5. An electric energy storage device for a subway car according to any of paragraphs 1-3, characterized in that the auxiliary systems for ensuring operation are cooling and air filtration systems.

6. An electric energy storage device for a subway car according to paragraph 5, characterized in that the cooling system is made in the form of exhaust fans with dampers located in the lower part of the T-shaped frame.

7. An energy storage device for a subway car according to paragraph 5, characterized in that the air filtration system is made in the form of filters installed on the air intake openings in the upper part of the T-shaped frame of the body.

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