CN113381427A - Traction power supply system based on flywheel energy storage and flywheel energy storage control scheduling method - Google Patents
Traction power supply system based on flywheel energy storage and flywheel energy storage control scheduling method Download PDFInfo
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- CN113381427A CN113381427A CN202110809145.6A CN202110809145A CN113381427A CN 113381427 A CN113381427 A CN 113381427A CN 202110809145 A CN202110809145 A CN 202110809145A CN 113381427 A CN113381427 A CN 113381427A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Abstract
The invention provides a traction power supply system based on flywheel energy storage and a flywheel energy storage control scheduling method, wherein a flywheel energy storage device is connected to a direct current bus of a traction network through a first converter, the flywheel energy storage device is connected to a low-voltage alternating current system through a second converter, and when the traction network breaks down, if the energy which can be provided by the flywheel energy storage device is more than or equal to the energy required for traction of a train to a preset position, the flywheel energy storage device releases energy to the traction network through the first converter and pulls the train to the preset position; if the energy which can be provided by the flywheel energy storage device is smaller than the energy required by the train to be pulled to the preset position and the low-voltage alternating current system does not break down, the second converter charges the flywheel energy storage device through the low-voltage alternating current system, so that the flywheel energy storage device releases energy to a traction network through the first converter and pulls the train to the preset position. The invention can improve the reliability of rail transit emergency traction.
Description
Technical Field
The invention belongs to the technical field of rail transit, and particularly relates to a traction power supply system based on flywheel energy storage and a flywheel energy storage control scheduling method.
Background
Urban rail transit is used as an electric energy-driven, fast and convenient public travel mode, and plays an important role in improving the environment and relieving traffic jam.
The rail transit emergency traction has no good solution, and only starts from the reliability of strengthening power supply guarantee, but the reliable power supply guarantee has the possibility of failure, the rail transit generally adopts a bilateral power supply mode to guarantee power supply at present, and a large bilateral power supply can be adopted when one traction substation fails, but when the whole traction power supply network fails, the train can be detained in an interval. At the moment, the subway generally adopts the method that a project truck is arranged to arrive at an accident site, and the project truck is used for towing a detained interval train to a specified position, however, the method is long in use time and takes dozens of minutes, and people in the detained train can be alarmed and even safety accidents can happen.
Therefore, how to ensure the reliability of emergency traction is a problem which needs to be solved urgently.
Disclosure of Invention
In view of the above, the invention provides a traction power supply system based on flywheel energy storage and a flywheel energy storage control scheduling method, which can improve the reliability of rail transit emergency traction.
The first aspect of the embodiments of the present invention provides a traction power supply system based on flywheel energy storage, including: the energy storage device of the flywheel is connected to a direct current bus of a traction network through the first converter, the energy storage device of the flywheel is connected to a low-voltage alternating current system through the second converter, the first switch is used for connecting the direct current bus of the traction network with the first converter, and the second switch is used for connecting the second converter with the low-voltage alternating current system;
when the traction network is in fault, if the energy which can be provided by the flywheel energy storage device is more than or equal to the energy required for pulling the train to a preset position, the flywheel energy storage device releases energy to the traction network through the first converter, and the train is pulled to the preset position;
if the energy which can be provided by the flywheel energy storage device is smaller than the energy required by the train to be pulled to the preset position and the low-voltage alternating current system does not break down, the second converter charges the flywheel energy storage device through the low-voltage alternating current system, so that the flywheel energy storage device releases energy to the traction network through the first converter and pulls the train to the preset position.
In a possible implementation manner, the system further comprises a storage battery, a third converter and a third switch, wherein the flywheel energy storage device is connected with the storage battery through the third converter, and the third switch is used for connecting the flywheel energy storage device and the third converter;
when the traction network and the low-voltage alternating current system are in fault, if the energy which can be provided by the flywheel energy storage device is smaller than the energy required for traction of the train to a preset position, the third converter charges the flywheel energy storage device through the storage battery, so that the flywheel energy storage device releases energy to the traction network through the first converter, and the train is pulled to the preset position.
In a possible implementation manner, the system further comprises a fourth converter and a fourth switch, and the storage battery is connected with the low-voltage alternating current system through the fourth converter and the fourth switch and is charged through the low-voltage alternating current system.
In a possible implementation manner, the first converter is a bidirectional DC/AC converter, the first converter is further configured to monitor a voltage of a DC bus of the traction grid, and when the DC voltage of the traction grid is less than or equal to a first preset value, the flywheel energy storage device is configured to release energy of the first converter to the traction grid, so that the voltage of the traction grid is kept within a preset range.
In a possible implementation manner, when the direct-current voltage of the traction network is greater than or equal to a second preset value, the flywheel energy storage device is used for absorbing energy of the traction network through the first converter.
In a possible implementation manner, the second converter is an energy storage converter PCS, and when the second converter charges the flywheel energy storage device through a low-voltage alternating current system, the PCS drives a motor of the flywheel device, so that the rotating speed of the flywheel device is increased to a preset rotating speed.
A second aspect of the embodiments of the present invention provides a method applied to a traction power supply system based on flywheel energy storage as described in the first aspect or any one of the possible implementation manners of the first aspect, where when the traction grid is in a normal operation state, the first switch is in a closed state, and the second switch is in an open state, the method including:
judging the running state of the traction net;
if the traction net is in a normal operation state, the first switch is indicated to be in a closed state, the second switch is indicated to be in an open state,
if the traction network fails, respectively calculating the energy which can be provided by the flywheel energy storage device and the energy required for traction of the train to a preset position;
judging whether the energy which can be provided by the flywheel energy storage device is more than or equal to the energy required for drawing the train to a preset position;
if the energy which can be provided by the flywheel energy storage device is more than or equal to the energy required for pulling the train to a preset position, releasing the energy of the flywheel energy storage device to the traction network through the first converter, and pulling the train to the preset position;
if the energy which can be provided by the flywheel energy storage device is less than the energy required for drawing the train to the preset position, judging whether the low-voltage alternating current system has a fault;
and if the low-voltage alternating current system is not in fault, indicating that the second switch is closed, and charging the flywheel energy storage device through the low-voltage alternating current system by the second converter so that the flywheel energy storage device releases energy to the traction network through the first converter and pulls the train to the preset position.
In one possible implementation, the method further includes:
when the traction net is in a normal operation state, indicating that the first switch is in a closed state, and the second switch and the third switch are in an open state;
and if the energy which can be provided by the flywheel energy storage device is less than the energy required by the train to be pulled to the preset position and the low-voltage alternating current system breaks down, indicating that the third switch is closed, and charging the flywheel energy storage device through the storage battery by the third converter so that the flywheel energy storage device releases energy to the traction network through the first converter and pulls the train to the preset position.
In a third aspect, an embodiment of the present invention provides a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method according to any one of the possible implementation manners of the second aspect or the second aspect when executing the computer program.
In a fourth aspect, the present invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the method according to the second aspect or any possible implementation manner of the second aspect.
The embodiment of the invention provides a traction power supply system based on flywheel energy storage and a flywheel energy storage control scheduling method. Thereby improving the reliability of rail transit emergency traction.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a prior art traction power supply system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a traction power supply system based on flywheel energy storage according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another traction power supply system based on flywheel energy storage according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another traction power supply system based on flywheel energy storage according to an embodiment of the present invention;
FIG. 5 is a flowchart of a flywheel energy storage control scheduling method according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of another traction power supply system based on flywheel energy storage according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, a schematic diagram of a traction power supply system according to an embodiment of the present invention is shown. With reference to fig. 1, most of the current domestic urban rail transit projects adopt a centralized power supply mode, and an alternating current system is 110/35Kv two-stage voltage system. The main substation is connected with a 110kV power supply from a local power grid, the voltage reduction is 35kV, namely, medium voltage, and then the main substation is supplied to a traction substation, a voltage reduction substation and the like at a ground train station and the like in a single direction through a medium voltage looped network. Generally, at least 2 main substations and a plurality of traction and voltage reduction substations are arranged on a line within 30 kilometers, wherein the voltage reduction substations mainly supply power for auxiliary loads such as elevators, lighting and the like in subway stations.
Specifically, the traction substation converts an alternating current 35kV voltage into a direct current 1500 or 750V voltage to supply power to the train.
Generally, a traction substation and a step-down substation in the same station should be co-constructed as a traction step-down hybrid substation as much as possible, so as to reduce investment and facilitate operation and management.
In order to solve the problem of train traction reliability caused by traction network failure, with reference to fig. 2, an embodiment of the present invention provides a traction power supply system based on flywheel energy storage, including: the energy storage device 21 is connected to a direct current bus of a traction network through the first converter 22, the energy storage device 21 is connected to a low-voltage alternating current system through the second converter 23, the first switch 24 is used for connecting the direct current bus of the traction network with the first converter 22, and the second switch 25 is used for connecting the second converter 23 with the low-voltage alternating current system;
when the traction network is in fault, if the energy which can be provided by the flywheel energy storage device 21 is greater than or equal to the energy required for pulling the train to a preset position, the flywheel energy storage device 21 releases energy to the traction network through the first converter 22, and the train is pulled to the preset position;
if the energy which can be provided by the flywheel energy storage device 21 is less than the energy required for pulling the train to the preset position and the low-voltage alternating current system is not in fault, the second converter 23 charges the flywheel energy storage device 21 through the low-voltage alternating current system, so that the flywheel energy storage device 21 releases energy to the traction network through the first converter 22, and the train is pulled to the preset position.
The flywheel energy storage device has the advantages of long service life, high charging and discharging speed and high instantaneous power, and is suitable for a scene that a traction network fails and a train needs to be quickly pulled to a specified place.
Optionally, a flywheel energy storage device is pre-installed in each substation, and the low-voltage alternating current system is a low-voltage 400V alternating current system of the substation. When the traction network, namely the contact network in fig. 1, breaks down, the flywheel energy storage device instantaneously supports the voltage of the contact network, the train continues to be pulled, if the electric quantity provided by the flywheel energy storage device can pull the train to a specified position, then the electric energy is provided by the flywheel energy storage device to the traction network to pull the train to the specified position, if the electric quantity provided by the flywheel energy storage device is not enough to move the train to the specified position, then when the flywheel energy storage device can not continue to supply power to the contact network, the flywheel energy storage device is charged through the low-voltage alternating current system, so that the flywheel energy storage device can provide the electric energy to pull the train to the specified position. Thereby improving the reliability of rail transit emergency traction.
In order to further ensure the reliability of train traction when a traction network fails, with reference to fig. 3, an embodiment of the present invention further provides a traction power supply system based on flywheel energy storage, where the system further includes a storage battery 26, a third converter 27 and a third switch 28, where the flywheel energy storage device 21 is connected to the storage battery 26 through the third converter 27, and the third switch 28 is used to connect the flywheel energy storage device 21 and the third converter 27;
when the traction network and the low-voltage alternating-current system both have faults, if the energy which can be provided by the flywheel energy storage device 21 is less than the energy required for traction of the train to a preset position, the third converter 27 charges the flywheel energy storage device 21 through the storage battery 26, so that the flywheel energy storage device 21 releases energy to the traction network through the first converter 22, and the train is pulled to the preset position.
When the traction network and the low-voltage alternating-current system both have faults, the traction power supply system provided by the embodiment of the invention further comprises a storage battery, and after the storage battery charges the flywheel energy storage device, the flywheel energy storage device releases electric energy to the contact network to support direct-current voltage, so that the train is pulled to a specified position.
Optionally, with reference to fig. 4, the system further includes a fourth converter 29 and a fourth switch 210, and the battery 26 is connected to the low-voltage ac system through the fourth converter 29 and the fourth switch 210 and is charged through the low-voltage ac system.
Optionally, the first converter 22 is a bidirectional DC/AC converter, the first converter 22 is further configured to monitor a voltage of a DC bus of the traction grid, and when the DC voltage of the traction grid is less than or equal to a first preset value, the flywheel energy storage device 21 is configured to release energy of the first converter 22 to the traction grid, so that the voltage of the traction grid is maintained within a preset range.
Optionally, when the dc voltage of the traction network is greater than or equal to a second preset value, the flywheel energy storage device 21 is configured to absorb energy of the traction network through the first converter 22.
When the traction network normally operates, the flywheel energy storage device is connected to the traction network, when a train brakes, the flywheel energy storage device absorbs braking energy, and when the train operates, the flywheel energy storage device releases electric energy to the traction network for traction of the train, so that the aim of saving energy is fulfilled.
Optionally, the second converter 23 is an energy storage converter PCS, and when the second converter 23 charges the flywheel energy storage device 21 through a low-voltage ac system, the PCS drives a motor of the flywheel device, so that the rotation speed of the flywheel device is increased to a preset rotation speed.
The embodiment of the invention provides a traction power supply system based on flywheel energy storage, when a traction network normally operates, a flywheel energy storage device is connected to the traction network, regenerated braking energy of a train is recovered, electric energy is saved, when the traction network fails and loses power, the flywheel energy storage device instantaneously supports the voltage of a contact network, the train is continuously dragged, if the electric quantity provided by the flywheel energy storage device can drag the train to a specified position, the electric energy is provided by the flywheel energy storage device to the traction network to drag the train to the specified position, if the electric quantity provided by the flywheel energy storage device is not enough to move the train to the specified position, when the flywheel energy storage device can not continuously supply power to the contact network, the flywheel energy storage device is charged through a low-voltage alternating current system, so that the flywheel energy storage device can provide electric energy to drag the train to the specified position. When the traction network and the low-voltage alternating-current system both have faults, the traction power supply system provided by the embodiment of the invention further comprises a storage battery, and after the storage battery charges the flywheel energy storage device, the flywheel energy storage device releases electric energy to the contact network to support direct-current voltage, so that the train is pulled to a specified position. Thereby improving the reliability of rail transit emergency traction.
Fig. 5 is a flowchart of a flywheel energy storage control scheduling method, which is detailed as follows:
and S501, judging the running state of the traction network.
And S502, if the traction network is in a normal operation state, indicating that the first switch is in a closed state and the second switch is in an open state.
When the traction network normally operates, the flywheel energy storage device is connected to the traction network, the first switch is closed, when the train brakes, the flywheel energy storage device absorbs braking energy, and when the train operates, the flywheel energy storage device releases electric energy to the traction network for traction of the train, so that the aim of saving energy is fulfilled.
And S503, if the traction network fails, respectively calculating the energy which can be provided by the flywheel energy storage device and the energy required for traction of the train to a preset position.
Optionally, when the traction network of a certain power supply interval has a fault, the flywheel energy storage device in the embodiment of the present invention may be all flywheel energy storage devices in the power supply interval, and the train refers to all trains in the power supply interval.
Or, when the whole traction network line has a fault, the flywheel energy storage devices in the embodiment of the present invention may be all flywheel energy storage devices in the line, and the train refers to all trains in the line.
Alternatively, the flywheel energy storage device according to the embodiment of the present invention may be 1 or more designated flywheel energy storage devices, and the train is 1 or more designated trains.
The embodiment of the present invention is not limited thereto.
And S504, judging whether the energy which can be provided by the flywheel energy storage device is more than or equal to the energy required for drawing the train to the preset position.
And S505, if the energy which can be provided by the flywheel energy storage device is more than or equal to the energy required for towing the train to a preset position, releasing the energy of the flywheel energy storage device to the towing net through the first converter, and towing the train to the preset position.
And S506, if the energy which can be provided by the flywheel energy storage device is less than the energy required for pulling the train to the preset position, judging whether the low-voltage alternating current system has a fault.
And S507, if the low-voltage alternating current system is not in fault, indicating that the second switch is closed, and charging the flywheel energy storage device through the low-voltage alternating current system by the second converter so that the flywheel energy storage device releases energy to the traction network through the first converter and pulls the train to the preset position.
As can be seen from the above, when the traction network, that is, the contact network corresponding to fig. 1, fails, the voltage of the contact network is instantaneously supported by the flywheel energy storage device, and the train continues to be pulled, if the electric quantity provided by the flywheel energy storage device can pull the train to a specified position, the flywheel energy storage device provides electric energy to the traction network to pull the train to the specified position, and if the electric quantity provided by the flywheel energy storage device is not enough to move the train to the specified position, the flywheel energy storage device is charged by the low-voltage alternating-current system when the flywheel energy storage device cannot continuously supply power to the contact network, so that the flywheel energy storage device can provide electric energy to pull the train to the specified position. Thereby improving the reliability of rail transit emergency traction.
Fig. 6 is a flowchart illustrating an implementation of another flywheel energy storage control scheduling method according to an embodiment of the present invention, where the method includes:
and S501, judging the running state of the traction network.
S502, if the traction net is in a normal operation state, the first switch is indicated to be in a closed state, and the second switch and the third switch are in an open state.
And S503, if the traction network fails, respectively calculating the energy which can be provided by the flywheel energy storage device and the energy required for traction of the train to a preset position.
And S504, judging whether the energy which can be provided by the flywheel energy storage device is more than or equal to the energy required for drawing the train to the preset position.
And S505, if the energy which can be provided by the flywheel energy storage device is more than or equal to the energy required for towing the train to a preset position, releasing the energy of the flywheel energy storage device to the towing net through the first converter, and towing the train to the preset position.
And S506, if the energy which can be provided by the flywheel energy storage device is less than the energy required for pulling the train to the preset position, judging whether the low-voltage alternating current system has a fault.
And S507, if the low-voltage alternating current system is not in fault, indicating that the second switch is closed, and charging the flywheel energy storage device through the low-voltage alternating current system by the second converter so that the flywheel energy storage device releases energy to the traction network through the first converter and pulls the train to the preset position.
And S508, if the low-voltage alternating current system fails, indicating that the third switch is closed, and charging the flywheel energy storage device through the storage battery by the third converter so that the flywheel energy storage device releases energy to the traction network through the first converter and pulls the train to the preset position.
When the traction network fails, the electric quantity provided by the flywheel energy storage device is not enough to pull the train to a specified position, but the low-voltage alternating current system does not have a fault, the third switch is in a disconnected state, and the low-voltage alternating current system charges the flywheel energy storage device. When the low-voltage alternating current system also has a fault, the third switch is closed, and the third converter charges the flywheel energy storage device through the storage battery, so that the flywheel energy storage device releases energy to the traction network through the first converter to pull the train to the preset position.
According to the method, when the traction network normally operates, the flywheel energy storage device is connected to the traction network, regenerated braking energy of the train is recovered, and electric energy is saved. When the traction network and the low-voltage alternating-current system both have faults, the traction power supply system provided by the embodiment of the invention further comprises a storage battery, and after the storage battery charges the flywheel energy storage device, the flywheel energy storage device releases electric energy to the contact network to support direct-current voltage, so that the train is pulled to a specified position. Thereby improving the reliability of rail transit emergency traction.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Fig. 7 is a schematic diagram of a terminal according to an embodiment of the present invention. As shown in fig. 7, the terminal 7 of this embodiment includes: a processor 70, a memory 71 and a computer program 72 stored in said memory 71 and executable on said processor 70. The processor 70, when executing the computer program 72, implements the steps in the flywheel energy storage control scheduling method embodiments, such as the steps 501 to 507 shown in fig. 5.
Illustratively, the computer program 72 may be partitioned into one or more modules/units that are stored in the memory 71 and executed by the processor 70 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 72 in the terminal 7.
The terminal 7 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal 7 may include, but is not limited to, a processor 70, a memory 71. It will be appreciated by those skilled in the art that fig. 7 is only an example of a terminal 7 and does not constitute a limitation of the terminal 7, and that it may comprise more or less components than those shown, or some components may be combined, or different components, for example the terminal may further comprise input output devices, network access devices, buses, etc.
The Processor 70 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 71 may be an internal storage unit of the terminal 7, such as a hard disk or a memory of the terminal 7. The memory 71 may also be an external storage device of the terminal 7, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) and the like provided on the terminal 7. Further, the memory 71 may also include both an internal storage unit and an external storage device of the terminal 7. The memory 71 is used for storing the computer program and other programs and data required by the terminal. The memory 71 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the flywheel energy storage control scheduling method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A traction power supply system based on flywheel energy storage is characterized by comprising: the energy storage device of the flywheel is connected to a direct current bus of a traction network through the first converter, the energy storage device of the flywheel is connected to a low-voltage alternating current system through the second converter, the first switch is used for connecting the direct current bus of the traction network with the first converter, and the second switch is used for connecting the second converter with the low-voltage alternating current system;
when the traction network is in fault, if the energy which can be provided by the flywheel energy storage device is more than or equal to the energy required for pulling the train to a preset position, the flywheel energy storage device releases energy to the traction network through the first converter, and the train is pulled to the preset position;
if the energy which can be provided by the flywheel energy storage device is smaller than the energy required by the train to be pulled to the preset position and the low-voltage alternating current system does not break down, the second converter charges the flywheel energy storage device through the low-voltage alternating current system, so that the flywheel energy storage device releases energy to the traction network through the first converter and pulls the train to the preset position.
2. The traction power supply system according to claim 1, further comprising a battery, a third converter, and a third switch, wherein the flywheel energy storage device is connected to the battery through the third converter, and the third switch is used for connecting the flywheel energy storage device and the third converter;
when the traction network and the low-voltage alternating current system are in fault, if the energy which can be provided by the flywheel energy storage device is smaller than the energy required for traction of the train to a preset position, the third converter charges the flywheel energy storage device through the storage battery, so that the flywheel energy storage device releases energy to the traction network through the first converter, and the train is pulled to the preset position.
3. The traction power supply system according to claim 2, further comprising a fourth converter and a fourth switch, wherein the battery is connected to the low voltage ac system through the fourth converter and the fourth switch, and is charged through the low voltage ac system.
4. The traction power supply system according to claim 1, wherein the first converter is a bidirectional DC/AC converter, the first converter is further configured to monitor the voltage of the traction grid DC bus, and when the traction grid DC voltage is less than or equal to a first predetermined value, the flywheel energy storage device is configured to release its own energy to the traction grid through the first converter so as to maintain the traction grid voltage within a predetermined range.
5. The traction power supply system according to claim 4, wherein the flywheel energy storage device is configured to absorb energy of the traction network via the first converter when the DC voltage of the traction network is greater than or equal to a second predetermined value.
6. The traction power supply system according to claim 1, wherein the second converter is a power storage converter (PCS), and when the second converter charges the flywheel energy storage device through a low-voltage alternating current system, the PCS drives a motor of the flywheel device to increase the rotation speed of the flywheel device to a preset rotation speed.
7. A flywheel energy storage control scheduling method is applied to a traction power supply system based on flywheel energy storage according to any one of claims 1 to 6, and the method comprises the following steps:
judging the running state of the traction net;
if the traction net is in a normal operation state, indicating that the first switch is in a closed state and the second switch is in an open state;
if the traction network fails, respectively calculating the energy which can be provided by the flywheel energy storage device and the energy required for traction of the train to a preset position;
judging whether the energy which can be provided by the flywheel energy storage device is more than or equal to the energy required for drawing the train to a preset position;
if the energy which can be provided by the flywheel energy storage device is more than or equal to the energy required for pulling the train to a preset position, releasing the energy of the flywheel energy storage device to the traction network through the first converter, and pulling the train to the preset position;
if the energy which can be provided by the flywheel energy storage device is less than the energy required for drawing the train to the preset position, judging whether the low-voltage alternating current system has a fault;
and if the low-voltage alternating current system is not in fault, indicating that the second switch is closed, and charging the flywheel energy storage device through the low-voltage alternating current system by the second converter so that the flywheel energy storage device releases energy to the traction network through the first converter and pulls the train to the preset position.
8. The method of claim 7, further comprising:
if the traction net is in a normal operation state, indicating that the first switch is in a closed state, and the second switch and the third switch are in an open state;
and if the energy which can be provided by the flywheel energy storage device is less than the energy required by the train to be pulled to the preset position and the low-voltage alternating current system breaks down, indicating that the third switch is closed, and charging the flywheel energy storage device through the storage battery by the third converter so that the flywheel energy storage device releases energy to the traction network through the first converter and pulls the train to the preset position.
9. A terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the steps of the method as claimed in claim 7 or 8 above are implemented when the processor executes the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method as set forth in claim 7 or 8 above.
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| CN113381427B (en) | 2022-09-06 |
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