Multi-Current Train Power Conversion for Four Grid Voltages
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Solution Overview
Problem
Existing train power conversion systems are unable to seamlessly operate across at least four commonly used grid voltage systems, including AC25kV/50Hz, AC15kV/16.7Hz, DC3000V, and DC1500V, which is necessary for trans-national and trans-regional train operations.
Innovation Solution
A multi-current power conversion system for trains that includes a transformation module, an inductor module, a target switching unit, a rectifier, and a post-circuit, which can regulate and convert alternating-current power with different voltage levels and direct-current power to ensure a fixed voltage output, thereby supporting multiple grid voltage systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the power conversion system is designed for a single grid voltage system, then the system structure is simple and reliable, but the adaptability to different power supply systems is poor
Solution Approach 1:
The power conversion system is designed with multi-functional capabilities to handle at least four different power supply systems (AC25kV/50Hz, AC15kV/16.7Hz, DC3000V, DC1500V). The transformation module can operate in different modes (transformer mode for AC, direct connection mode for DC) to accommodate various input types, and the rectifier module can process both AC and DC inputs through configurable switching circuits, enabling a single system to perform multiple functions across different railway networks.
Solution Approach 2:
The system employs dynamic switching mechanisms where the transformation module and rectifier module can reconfigure their internal circuit topologies based on the detected input power type. Controllable switches dynamically adjust the circuit configuration to match the input power characteristics, allowing the system to adapt its structure in real-time rather than requiring fixed hardware for each power system.
2Adaptability or versatility
If the power conversion system is designed to support multiple grid voltage systems, then the adaptability improves, but the system structure becomes complex
Solution Approach 1:
The power conversion system is divided into functionally independent modules: a transformation module that handles AC-to-DC conversion and a rectifier module that processes DC power. Each module can be independently configured and controlled, allowing the system to selectively activate only the necessary components for the current power input type, thereby reducing the effective complexity despite supporting multiple power systems.
Solution Approach 2:
The transformation module serves as an intermediary that standardizes different input power types (AC or DC) into a unified intermediate form that the rectifier module can process. This intermediary layer abstracts the complexity of handling multiple power systems, presenting a consistent interface to the downstream circuitry and simplifying the overall control architecture.
3Manufacturing precision
If different filter circuits are used for different AC power voltages, then the power conversion precision improves, but the device complexity increases
Solution Approach 1:
Instead of using different physical filter circuits for different AC voltages, the system changes the electrical parameters (inductance and capacitance values) of a single filter circuit through dynamic switching. The rectifier module contains switching circuits that can reconfigure the filter components to have optimal parameter values for the current input voltage level, maintaining conversion precision while avoiding the need for multiple dedicated filter circuits.
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
The system effectively supports at least four types of grid voltage systems by regulating the transformation module and inductor module to maintain a fixed voltage output, ensuring seamless operation across different power supply systems.
Implementation Method 1
a transformation module 10 having a first input terminal connected to an AC input and a second input terminal connected to a DC input, and configured to output, when receiving an alternating-current power of any voltage level, an alternating-current power of a fixed voltage level
Implementation Method 2
a rectifier 50 configured to control, for different direct-current power received by the transformation module 10, an on/off state of switching devices of the rectifier 50
Implementation Method 3
an inductor module 20 configured to, when the transformation module receives k th
Data Source
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AI summary
Disclosed are a train and a multi-current power conversion system thereof. The system comprises: a transformation module, an inductance module, a target switching tube, a first capacitance, a post-circuit, a target switching unit and a rectifier. The transformation module is used to, when receiving different alternating currents, output to the rectifier alternating currents having the same voltage; and to, when receiving direct currents, output to the inductance module direct currents. The inductance module is used to, when the transformation module receives the kth alternating current, conduct a first end to a second end thereof, and control the equivalent inductance between the first end and the second end to be the preset equivalent inductance corresponding to the kth alternating current. The rectifier is used to, when the transformation module receives different direct currents, control a switching device thereof to be on or off according to corresponding rules such that the voltage provided to the post-circuit remains the same. The solution of the present application supports at least 4 kinds of grid voltage systems.