CN113525269A - Eddy current braking power supply system - Google Patents
Eddy current braking power supply system Download PDFInfo
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- CN113525269A CN113525269A CN202110783205.1A CN202110783205A CN113525269A CN 113525269 A CN113525269 A CN 113525269A CN 202110783205 A CN202110783205 A CN 202110783205A CN 113525269 A CN113525269 A CN 113525269A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/28—Eddy-current braking
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
Abstract
The invention provides an eddy current braking power supply system, comprising: a first power supply circuit in controllable electrical connection with the eddy current braking device, comprising: the excitation power supply is electrically connected with the intermediate loop of the traction converter; a second power supply circuit in controllable electrical connection with the eddy current braking device, comprising: the standby power supplies are electrically connected with the intermediate loop of the traction converter or the traction motor in two different modes; the power supply control module is electrically connected with the first power supply loop and the second power supply loop; the power supply control module selects a power supply loop for supplying power to the eddy current brake device according to loop states of the first power supply loop and the second power supply loop during emergency braking. The eddy current braking power supply system can improve the reliability of eddy current braking power supply and meet the requirement of emergency braking.
Description
Technical Field
The invention belongs to the technical field of rail vehicle braking, and particularly relates to an eddy current braking power supply system for a high-speed train.
Background
The braking technology is a key technology for restricting the highest running speed of the train and guaranteeing the running safety. According to the relation that the kinetic energy increases with the increase of the speed of the train by the power of 2, the burden of increasing the running speed to a braking system is large. At present, high-speed trains in the world generally adopt a composite braking mode of friction braking and dynamic braking, and the generation of final braking force depends on the adhesion between wheel rails, belonging to an adhesion braking mode. As the speed of the train increases, the wheel-rail adhesion coefficient gradually decreases, and it is difficult for the adhesion brake to exert a sufficient braking force in a high-speed section. Therefore, when the train is further accelerated, the kinetic energy is greatly increased, and the adhesion braking force is reduced at a high speed, so that the braking distance is greatly increased only by adopting the adhesion braking method. In order to reduce the braking distance and ensure the operation safety, the rail transit field is always developing novel non-adhesive braking technologies, such as linear eddy current braking, magnetic rail braking, wind resistance braking and the like.
The basic principle of linear eddy current braking is that a closed magnetic loop is formed by electromagnets with alternately arranged magnetic poles and a steel rail, and when the electromagnets and the steel rail move relatively, electric eddy currents are generated on the surface of the steel rail and electromagnetic component force opposite to the moving direction is formed under the action of a magnetic field. The linear eddy current brake is regarded as a new technology with great popularization prospect due to the following outstanding characteristics: (1) the braking force is generated on the linear eddy current braking device and is directly transmitted to the bogie, is not limited by the condition of wheel rail adhesion, and can be used as the supplement of the traditional braking mode; (2) the braking force output at the high-speed stage is considerable and stable, and the braking distance can be effectively shortened; (3) the brake device is not in contact with the steel rail, has no abrasion and noise, and is green and environment-friendly; (4) by controlling the exciting current, the braking force can be adjusted. ICE3 high speed trains in germany are now mass-equipped with linear eddy current braking systems and are operated on european multinational railways.
The linear eddy current brake system generally comprises a linear eddy current brake device, an excitation power supply and an eddy current brake control unit, wherein the excitation power supply can be integrated with the traction unit or form an independent unit, and the eddy current brake control unit can be integrated with the brake control unit or form an independent unit. Because the eddy current braking excitation power is larger, the existing power supply mode of the eddy current braking system developed at home and abroad generally gets electricity from the traction intermediate circuit, and the electricity is output to the eddy current braking device after being adjusted by an excitation power supply. The complete power supply loop of the power supply mode has a complex structure, and relates to functional modules such as a contact network, a transformer, a traction converter, an excitation power supply and the like, and the problem of any link can result in that the power cannot be normally supplied to the eddy current brake device.
Therefore, the current eddy current brake power supply mode applied in the market cannot meet the safety level requirement of safety brake, and the eddy current brake cannot be used as the safety brake. For example, the german ICE3 train eddy current braking system is commonly applied to service braking and quick braking.
Emergency braking is used as the last barrier for guaranteeing safe braking of the train, and the emergency braking system is required to have a high enough integrity level. Theoretically, all available braking resources can be invested in emergency braking to reduce the actual parking distance, but in order to guarantee safety, the emergency braking distance is required to be ensured by the braking function which has the function safety and the highest integrity level in all the available braking resources.
The technology of the braking device and the control unit in the eddy current braking system is mature, and the related safety level requirements are relatively easy to realize. However, as mentioned above, the current architecture is complex and difficult to meet the requirements of safety braking. Therefore, it is a necessary condition to make the eddy current brake meet the emergency braking requirement to improve the safety level of the eddy current brake power supply.
Disclosure of Invention
In view of the above-mentioned defects of the prior art, an object of the present invention is to provide an eddy current braking power supply system to improve the reliability of the eddy current braking power supply system and meet the requirement of emergency braking.
In order to achieve the purpose, the invention adopts the following technical scheme:
an eddy current braking power supply system comprising:
a first power supply circuit in controllable electrical connection with an eddy current braking device, comprising: the excitation power supply is electrically connected with the intermediate loop of the traction converter;
a second power supply circuit in controllable electrical connection with the eddy current braking device, comprising: the standby power supply is electrically connected with the middle loop of the traction converter or the traction motor;
the power supply control module is electrically connected with the first power supply loop and the second power supply loop; the power supply control module selects a power supply loop for supplying power to the eddy current brake device according to loop states of the first power supply loop and the second power supply loop during emergency braking.
In a preferred embodiment, when the emergency brake is applied, the power supply control module selects the second power supply circuit to supply power to the eddy current brake device when the first power supply circuit is in the unavailable state, and cuts off the electrical connection between the excitation power supply and the eddy current brake device.
In a preferred embodiment, when the service brake is applied, the power control module selects the first power supply circuit to supply power under the condition that the first power supply circuit is normal, and cuts off the eddy current brake under the condition that the first power supply circuit is unavailable.
In a preferred embodiment, in the first power supply loop, a first switch for controlling on-off is arranged between the excitation power supply and the intermediate loop; and a second switch for controlling on-off is arranged between the eddy current braking device and the excitation power supply.
As a preferred embodiment, the backup power source includes a storage battery electrically connected to the eddy current braking device, and a charging device electrically connected to the storage battery; the charging device is connected with the intermediate loop; a third switch for controlling on-off is arranged between the charging device and the intermediate loop; a fourth switch for controlling the on-off is arranged between the storage battery and the eddy current braking device;
and the power supply control module closes the third switch and controls the charging device to charge the storage battery when the storage capacity of the storage battery is lower than a preset value and the fourth switch is in an off state.
As a preferred embodiment, the electrical connection position of the battery and the eddy current braking device is located between the second switch and the eddy current braking device; the electric connection position of the charging device and the intermediate circuit is located between the first switch and the intermediate circuit.
In a preferred embodiment, the second switch is an excitation power supply output contactor electrically connected to the power supply control module; the fourth switch for with the battery output contactor that power control module electricity is connected, power control module includes: a first interlock control portion capable of closing only one of the excitation power supply output contactor and the battery output contactor in response to eddy current braking.
As a preferred embodiment, the backup power source comprises a rectifying and filtering device electrically connected with the traction motor; a fifth switch for controlling on-off is arranged between the traction motor and an inverter of the traction converter; a sixth switch for controlling on-off is arranged between the rectifying and filtering device and the traction motor; and a seventh switch for controlling the on-off is arranged between the rectifying and filtering device and the eddy current braking device.
As a preferred embodiment, the electrical connection position of the rectifying and smoothing device and the eddy current braking device is located between the second switch and the eddy current braking device; and the electric connection position of the rectifying and filtering device and the traction motor is positioned between the fifth switch and the traction motor.
In a preferred embodiment, the fifth switch is an inverter output contactor electrically connected to the power control module; the sixth switch is a rectification filtering input contactor electrically connected with the power supply control module; the seventh switch is a rectifying and filtering output contactor electrically connected with the power control module, and the power control module comprises: a second interlock control section capable of closing only one of the excitation power supply output contactor and the rectification filter output contactor in response to eddy current braking, and a third interlock control section capable of closing only one of the inverter output contactor and the rectification filter input contactor.
In a preferred embodiment, the traction motor is a permanent magnet motor.
Has the advantages that:
the eddy current braking power supply system is provided with a first power supply loop and a second power supply loop which supply power to an eddy current braking device, and a power supply control module is used for selecting the power supply loop which supplies power to the eddy current braking device according to the loop states of the first power supply loop and the second power supply loop, so that when one power supply loop fails and emergency braking occurs, the other power supply loop can still be selected for supplying power to implement eddy current braking, and therefore the eddy current braking power supply system can obviously improve the reliability of the system and meet the emergency braking requirement.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic diagram of an eddy current braking power supply system provided by one embodiment of the present invention;
fig. 2 is a schematic diagram of an eddy current braking power supply system according to another embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and 2, in an embodiment of the present application, an eddy current braking power supply system includes: the eddy current braking device comprises a first power supply loop in controllable electric connection with the eddy current braking device, a second power supply loop in controllable electric connection with the eddy current braking device, and a power supply control module in electric connection with the first power supply loop and the second power supply loop.
Wherein, first power supply loop includes: and the excitation power supply is electrically connected with the intermediate loop of the traction converter. Specifically, the traction converter intermediate circuit is located in a traction converter assembly, wherein the traction converter assembly includes four quadrants electrically connected to a transformer, an intermediate circuit electrically connected to the four quadrants, and an inverter electrically connected to the intermediate circuit.
The excitation power supply gets electricity from the intermediate loop, and outputs the electricity to the eddy current braking device after the excitation power supply is isolated and converted, so the first power supply loop can also be called as an excitation power supply loop. The excitation power supply comprises an isolation module, a chopping voltage reduction module, an excitation power supply control unit and the like, and the excitation power supply can adjust the excitation current of the corresponding grade according to the braking grade. Under the condition that an excitation power supply is independently adopted to supply power to the eddy current braking device, the complete power supply loop has large span and complex structure, all functional modules are connected in series, and the reliability of the complete power supply loop cannot meet the requirement of emergency braking.
Based on this, the eddy current braking power supply system of the application provides a second power supply loop. The second power supply loop includes: and the standby power supply is electrically connected with the eddy current braking device. The standby power supply is electrically connected with the eddy current braking device. The power supply control module selects a power supply loop for supplying power to the eddy current brake device according to loop states of the first power supply loop and the second power supply loop during emergency braking. The second power supply loop is completely independent from the original excitation power supply loop and is not influenced by links such as a contact network, a transformer, a traction converter, an excitation power supply and the like, so that the reliability of the eddy current braking power supply system is improved, and the eddy current braking meets the safety level requirement of emergency braking.
During emergency braking, the power supply control module selects the second power supply loop to supply power to the eddy current braking device under the condition that the first power supply loop is in an unavailable state, and cuts off the electric connection between the excitation power supply and the eddy current braking device. The excitation power supply can be provided with a state monitoring module, the state monitoring module is used for monitoring the working state of the excitation power supply, and if a fault occurs, the state monitoring module sends a loop abnormal signal to the power supply control module. Based on the loop abnormal signal, the power supply control module determines that the first power supply loop is in an unavailable state, and then selects the second power supply loop to supply power to the eddy current braking device during emergency braking, so that the eddy current braking device is normally started to brake the train.
And when the service brake is applied, the power supply control module selects the first power supply loop to supply power under the condition that the first power supply loop is normal, and cuts off the eddy current brake under the condition that the first power supply loop is unavailable. At this time, the train can adopt other braking modes to supplement the braking force.
In the first power supply loop, a first switch for controlling on-off is arranged between the excitation power supply and the intermediate loop; and a second switch for controlling on-off is arranged between the eddy current braking device and the excitation power supply. The power supply control module is electrically connected with the first switch and the second switch to control the on-off of the first switch and the second switch, so that the on-off control of the excitation power supply, the intermediate circuit and the eddy current braking device is realized, and the electric connection controllability of the first power supply circuit and the eddy current braking device is further realized. Specifically, the first switch is an excitation power supply input contactor KM1 electrically connected with the power supply control module; the second switch is an excitation power supply output contactor KM2 electrically connected with the power supply control module.
In the following embodiments of the present application, specific implementation means of the second power supply loop include, but are not limited to, the following two: (1) the power is supplied by a storage battery, as shown in FIG. 1; (2) powered by a permanent magnet motor as shown in fig. 2.
In one embodiment as shown in fig. 1, the backup power source includes a battery electrically connected to the eddy current braking device, and a charging device electrically connected to the battery. The electric connection position of the storage battery and the eddy current braking device is located between the second switch and the eddy current braking device, and the electric connection position of the charging device and the intermediate circuit is located between the first switch and the intermediate circuit. And a third switch for controlling on-off is arranged between the charging device and the intermediate loop, and a fourth switch for controlling on-off is arranged between the storage battery and the eddy current braking device.
And the power supply control module closes the third switch when the storage capacity of the storage battery is lower than a preset value and the fourth switch is in an open state, and controls the charging device to charge the storage battery. Thus, when the eddy current brake is not applied, if the electric energy of the storage battery is insufficient, the storage battery is charged by the charging device. The storage battery is provided with a battery electric quantity and health state monitoring system. The charging source can be executed according to specific conditions, is not limited to taking power from the intermediate circuit, and can also take power from other positions, such as an auxiliary converter.
In this embodiment, the third switch is a charging contact KM3 electrically connected to the power control module. The fourth switch is a storage battery output contactor KM4 electrically connected with the power control module. In this embodiment, the power control module includes: and a first linkage control part which can close only one of the excitation power supply output contactor KM2 and the storage battery output contactor KM4 when responding to eddy current braking.
In a non-braking state, when the excitation power supply loop is normal, the excitation power supply input contactor KM1 is in a closed state, and the excitation power supply output contactor KM2 and the storage battery output contactor KM4 are in an open state.
When the eddy current brake responds to the service brake, if the power supply loop of the excitation power supply is normal, the power supply control module closes the excitation power supply output contactor KM2, the excitation power supply supplies power to the eddy current brake device, and meanwhile, the storage battery output contactor KM4 is controlled to be disconnected. If the excitation power supply circuit has a fault, the brake system cuts off eddy current brake, and other brake modes supplement the common brake force.
When the eddy current brake responds to the emergency brake, if the excitation power supply loop is normal, the power supply control module closes the KM2, the excitation power supply loop supplies power, and meanwhile the storage battery output contactor KM4 is controlled to be disconnected. If the excitation power supply fails, the storage battery output contactor KM4 is closed, power is supplied by the storage battery power supply loop, and meanwhile the excitation power supply output contactor KM2 is controlled to be disconnected.
As shown in fig. 1, in the power supply mode of this embodiment, a storage battery is added as a redundant power supply for eddy current braking, and the capacity of the storage battery should at least meet the requirement of emergency braking for 1-2 times. The output end of the middle loop of the traction converter is connected with two power supply loops, and one of the two power supply loops is connected with an excitation power supply; the other path is connected with a charging device and a storage battery, and the storage battery is used as a constant voltage source to directly supply power for the eddy current braking device.
The storage battery supplies power to the eddy current braking device in a constant voltage source mode, and the resistance is increased due to the temperature rise of the electromagnet of the eddy current braking device, so that the exciting current is gradually reduced, and the braking force is gradually reduced. However, the braking time is short, the reduction range of the exciting current is limited (about 20%), the average braking force in the whole braking process is still considerable, particularly, the train speed is maximum in the initial braking stage, the eddy current braking force is also maximum at the moment, and the stage is particularly obvious for shortening the braking distance.
In the method adopted by the embodiment, the storage battery power supply loop and the excitation power supply loop are connected in parallel, the two power supply loops are mutually independent, and the power supply control module selects a connection path according to the available states of the two power supply loops during emergency braking. When the working state of the two loops is normal, the excitation power supply is preferentially selected to supply power, and when the loop where the excitation power supply is located fails, the electric energy stored in the storage battery can still meet the requirement of eddy current emergency braking, so that the overall reliability of the power supply system is improved.
In addition, the storage battery power supply loop does not need to use a high-power module and a digital control chip, and has high reliability and safety. The storage battery power supply loop is used as a redundancy design of the excitation power supply loop, so that the eddy current brake can still be used as an emergency brake when the excitation power supply loop fails.
In another embodiment, as shown in FIG. 2, the backup power source includes a rectifier and filter device electrically connected to the traction motor. The rectifying and filtering device comprises a rectifier, a filter and the like. In this embodiment, the traction motor is a permanent magnet motor, and a second power supply loop led out from the permanent magnet motor, which may be further referred to as a permanent magnet motor power supply loop, is connected in parallel with the excitation power supply loop. When braking, the permanent magnet motor works in a generator mode, magnetic lines of force generated by the permanent magnet cut the stator winding to generate induced current on the winding, the induced current is led out between the traction motor and the inverter to the rectifier, and the induced current is filtered by the filter and then output to the eddy current braking device. And a fifth switch for controlling on-off is arranged between the traction motor and the inverter. And a sixth switch for controlling on-off is arranged between the rectifying and filtering device and the traction motor. And a seventh switch for controlling the on-off is arranged between the rectifying and filtering device and the eddy current braking device.
Specifically, the fifth switch is an inverter output contactor KM5 electrically connected to the power control module. The sixth switch is a rectifying and filtering input contactor KM6 electrically connected with the power control module. The seventh switch is a rectifying and filtering output contactor KM7 electrically connected with the power control module. Wherein the power control module comprises: a second linkage control section capable of closing only one of the excitation power supply output contactor KM2 and the rectification filter output contactor KM7 in response to eddy current braking, and a third linkage control section capable of closing only one of the inverter output contactor KM5 and the rectification filter input contactor KM 6.
In a non-braking state, when an excitation power supply loop is normal, an excitation power supply input contactor KM1 is in a closed state, an excitation power supply output contactor KM2 and a rectification filtering output contactor KM7 are in an open state, an inverter output contactor KM5 is in a closed state, and a rectification filtering input contactor KM6 is in an open state.
When the eddy current brake responds to the service brake, if the power supply loop of the excitation power supply is normal, the power supply control module closes the excitation power supply output contactor KM2, the excitation power supply supplies power to the eddy current brake device, and simultaneously controls the rectification filtering output contactor KM7 to be disconnected. If the power supply circuit has faults, the brake system cuts off eddy current brake, and other brake modes supplement the common brake force.
When the eddy current brake responds to the emergency brake, if the excitation power supply loop is normal, the power supply control module closes the excitation power supply output contactor KM2, the excitation power supply loop supplies power, and meanwhile, the rectification filtering output contactor KM7 is controlled to be disconnected. If the excitation power supply fails, the power supply control module disconnects the inverter output controller KM5 and the excitation power supply output contactor KM2, closes the rectifying and filtering input controller KM6 and the rectifying and filtering output contactor KM7, and is powered by the permanent magnet motor.
In the method adopted by the embodiment, the permanent magnet motor can generate induction current without external excitation during emergency braking, and the induction current can be used for an eddy current braking device after rectification and filtering processing. External energy is not consumed when the permanent magnet motor supplies power, storage battery type chemical energy storage components are not additionally arranged, the energy-saving, environment-friendly and weight-reducing trends of the train are met, a digital control chip is not needed to be used in a power supply loop, and the high-reliability and high-safety permanent magnet motor has high reliability and safety. The power supply loop of the permanent magnet motor is connected with the power supply loop of the excitation power supply in parallel, the two power supply paths are mutually independent, and the overall reliability of the power supply system is improved.
The electrical energy generated by the permanent magnet motor is sufficient for use adjacent to the eddy current braking device and has a sufficient margin, which means that the permanent magnet motor can achieve the power supply requirement even at a low wheel rolling adhesion coefficient, and the availability of power supplied by the permanent magnet motor is high.
In summary, when the excitation power supply circuit is unavailable due to special situations (such as a catenary fault, blocked traction, an excitation power failure, and the like) in emergency braking, the schemes provided by the embodiment of fig. 1 and the embodiment of fig. 2 can both ensure that the eddy current braking device can respond to the emergency braking request in time.
Any numerical value recited herein includes all values from the lower value to the upper value, in increments of one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.
Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.
All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.
A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed subject matter.
Claims (11)
1. An eddy current braking power supply system, comprising:
a first power supply circuit in controllable electrical connection with an eddy current braking device, comprising: the excitation power supply is electrically connected with the intermediate loop of the traction converter;
a second power supply circuit in controllable electrical connection with the eddy current braking device, comprising: the standby power supply is electrically connected with the middle loop of the traction converter or the traction motor;
the power supply control module is electrically connected with the first power supply loop and the second power supply loop; the power supply control module selects a power supply loop for supplying power to the eddy current brake device according to loop states of the first power supply loop and the second power supply loop during emergency braking.
2. An eddy current brake power supply system as claimed in claim 1, wherein when emergency braking is applied, the power control module selects the second power supply loop to supply power to the eddy current brake device and cuts off the electrical connection between the excitation power supply and the eddy current brake device if the first power supply loop is in an unavailable state.
3. An eddy current brake supply system as claimed in claim 2, wherein when the service brake is applied, the power control module selects the first supply circuit to supply power if the first supply circuit is normal and cuts off the eddy current brake if the first supply circuit is unavailable.
4. An eddy current brake power supply system as claimed in claim 1, wherein in the first power supply loop, a first switch for controlling on-off is provided between the excitation power supply and the intermediate loop; and a second switch for controlling on-off is arranged between the eddy current braking device and the excitation power supply.
5. An eddy current brake power supply system as claimed in claim 4, wherein the backup power source comprises a battery electrically connected to the eddy current brake device, and a charging device electrically connected to the battery; the charging device is connected with the intermediate loop; a third switch for controlling on-off is arranged between the charging device and the intermediate loop; a fourth switch for controlling the on-off is arranged between the storage battery and the eddy current braking device;
and the power supply control module closes the third switch and controls the charging device to charge the storage battery when the storage capacity of the storage battery is lower than a preset value and the fourth switch is in an off state.
6. An eddy current brake power supply system as claimed in claim 5, wherein the electrical connection location of the battery to the eddy current brake is between the second switch and the eddy current brake; the electric connection position of the charging device and the intermediate circuit is located between the first switch and the intermediate circuit.
7. An eddy current brake power supply system as claimed in claim 5, wherein the second switch is an excitation power supply output contactor electrically connected to the power supply control module; the fourth switch for with the battery output contactor that power control module electricity is connected, power control module includes: a first interlock control portion capable of closing only one of the excitation power supply output contactor and the battery output contactor in response to eddy current braking.
8. An eddy current brake power supply system as claimed in claim 4, wherein said backup power source includes a rectifying and smoothing device electrically connected to said traction motor; a fifth switch for controlling on-off is arranged between the traction motor and an inverter of the traction converter; a sixth switch for controlling on-off is arranged between the rectifying and filtering device and the traction motor; and a seventh switch for controlling the on-off is arranged between the rectifying and filtering device and the eddy current braking device.
9. An eddy current braking power supply system as claimed in claim 8 wherein the electrical connection location of said rectifying and smoothing means to said eddy current braking means is between said second switch and said eddy current braking means; and the electric connection position of the rectifying and filtering device and the traction motor is positioned between the fifth switch and the traction motor.
10. An eddy current brake power supply system as claimed in claim 8, wherein the fifth switch is an inverter output contactor electrically connected to the power control module; the sixth switch is a rectification filtering input contactor electrically connected with the power supply control module; the seventh switch is a rectifying and filtering output contactor electrically connected with the power control module, and the power control module comprises: a second interlock control section capable of closing only one of the excitation power supply output contactor and the rectification filter output contactor in response to eddy current braking, and a third interlock control section capable of closing only one of the inverter output contactor and the rectification filter input contactor.
11. An eddy current brake power supply system as claimed in claim 8, wherein the traction motor is a permanent magnet motor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110783205.1A CN113525269A (en) | 2021-07-12 | 2021-07-12 | Eddy current braking power supply system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110783205.1A CN113525269A (en) | 2021-07-12 | 2021-07-12 | Eddy current braking power supply system |
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| CN113525269A true CN113525269A (en) | 2021-10-22 |
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| CN202110783205.1A Pending CN113525269A (en) | 2021-07-12 | 2021-07-12 | Eddy current braking power supply system |
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Cited By (1)
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| CN114043876A (en) * | 2021-11-09 | 2022-02-15 | 中国铁道科学研究院集团有限公司 | Train braking system based on eddy current braking |
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