Train Rescue Power Circuit for Direct Auxiliary Load Supply
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Solution Overview
Problem
Conventional power supply systems for train rescue cannot directly supply power to a fault train, resulting in auxiliary loads being inoperable during towing, affecting passenger comfort and increasing design costs.
Innovation Solution
A power supply circuit for train rescue that includes a traction transformer, traction motors, and a converter inverter with independent axis control circuits, featuring power supply isolation switches to connect and disconnect power to the fault train, allowing direct power supply during towing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional power supply systems are used for train rescue, then the rescue train cannot directly supply power to the fault train, but auxiliary loads cannot operate during towing, affecting passenger comfort
Solution Approach 1:
The converter inverter system is designed to perform multiple functions: it can drive traction motors for normal train operation and simultaneously supply power to auxiliary loads during rescue towing. By configuring isolation switches to connect the intermediate direct current link to either traction motors or auxiliary power supply terminals, the system achieves multi-functionality without requiring separate dedicated systems for each purpose.
Solution Approach 2:
The patent combines the traction power supply system and auxiliary power supply system into a unified converter inverter architecture. Both traction motors and auxiliary loads share the same converter inverter unit, which draws power from the same traction transformer. This merging eliminates the need for separate auxiliary power systems and enables direct power supply to auxiliary loads during rescue operations.
2Ease of operation
If auxiliary loads are required to operate during rescue towing, then additional devices must be arranged to the fault train, resulting in high design cost
Solution Approach 1:
The converter inverter system is designed to perform multiple functions: it can drive traction motors for normal train operation and simultaneously supply power to auxiliary loads during rescue towing. By configuring isolation switches to connect the intermediate direct current link to either traction motors or auxiliary power supply terminals, the system achieves multi-functionality without requiring separate dedicated systems for each purpose.
Solution Approach 2:
The rescue train uses its own existing traction power supply system to provide power to the fault train's auxiliary loads. The system serves itself by utilizing the converter inverter and traction transformer already present in the rescue train, eliminating the need for additional dedicated auxiliary power generation equipment on either the rescue or fault train.
3Ease of operation
If the auxiliary power supply system cannot operate during stationary to minimum speed transition, then auxiliary loads cannot operate during this period, affecting riding comfort
Solution Approach 1:
The isolation switches are pre-configured to enable direct connection between the intermediate direct current link and auxiliary power supply terminals. This preliminary configuration allows the auxiliary power supply to activate immediately when needed, without waiting for the train to reach minimum operating speed for traditional power generation.
Solution Approach 2:
The system dynamically switches between different operating modes using isolation switches. The converter inverter can seamlessly transition between driving traction motors and supplying auxiliary loads based on operational requirements. This dynamic flexibility allows auxiliary power to be supplied during stationary conditions and speed transitions, eliminating the traditional delay associated with reaching minimum operating speed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the operation of auxiliary loads on the fault train during rescue towing, improving passenger comfort and reducing design costs by providing a direct power supply from the rescue train.
Implementation Method 1
a high voltage electrical switch connected to a secondary winding of the traction transformer corresponding to the independent axis control circuit and is configured to input or isolate a supply voltage that is obtained by reducing a voltage of a power grid through the traction transformer
Implementation Method 2
The rectifier device is connected to the high voltage electrical switch and is configured to rectify the supply voltage to obtain a direct current voltage
Implementation Method 3
The inverter device is connected to the intermediate direct current link and is configured to invert the direct current voltage in the intermediate direct current link to obtain an alternating current voltage, so as to supply power to a traction motor connected to the independent axis control circuit
Implementation Method 4
an output terminal of the independent axis control circuit is connected to a traction motor corresponding to the independent axis control circuit
Data Source
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AI summary
A train rescue power supply circuit, a control method and a device, wherein the circuit is applied to a rescue train and comprises: a traction transformer, a rectification inverter composed of a first preset number of independent axis control circuits, and a traction motor; a second preset number of independent axis control circuits, comprising: a first power supply isolation switch, which is used for connecting or disconnecting the connection between a positive line of an intermediate direct current link of a corresponding independent axis control circuit and a train being rescued; and a second power supply isolation switch, which is used for connecting or disconnecting the connection between a negative line of the corresponding intermediate direct current link and the train being rescued. The positive lines and the negative lines of the intermediate direct current links of the second preset number of independent axis control circuits in the present invention may directly supply power to the train being rescued by means of the first power supply isolation switch and the second power supply isolation switch such that the train being rescued may maintain the normal operation of an auxiliary load during rescue and return, which improves user experience and reduces design costs.