A mobile charging intelligent rail highway power supply system and a power supply method thereof

Abstract

The application relates to the technical field of power supply, and provides a mobile charging intelligent rail road power supply system and a power supply method thereof, which solve the problem that a single mode of an existing power supply system is difficult to meet the requirements of high efficiency, safety and flexibility, the application comprises core components such as a high-voltage transmission line, a charging rectifier station, a catenary and a pantograph, and realizes efficient conversion and utilization of electric energy through devices such as a DC-DC converter, an inverter and a permanent magnet synchronous alternating current motor, the application is characterized in that an intelligent power supply management unit, a multi-mode compatible unit and a catenary power supply unit are introduced, intelligent management, multi-mode compatibility and real-time monitoring of electric energy are realized, the application can not only adjust the power supply mode according to the mode of an external power supply, but also improves the efficiency and safety of system operation.

Description

Technical Field

[0001] This invention relates to the field of power supply technology, and provides a mobile charging intelligent rail transit power supply system and its power supply method. Background Technology

[0002] The mobile charging intelligent rail transit power supply system is a crucial component for maintaining the normal operation of urban vehicles, responsible for providing a stable and reliable power supply to dual-source heavy-duty trucks. This system typically consists of several key components, including high-voltage transmission lines, charging rectifiers, overhead contact lines, and pantographs, working together to improve the smooth transmission and efficient utilization of electrical energy.

[0003] In existing trolleybus power supply systems, most adopt a single power supply system. While this single power supply system meets the basic needs of the vehicles to a certain extent, it falls short when facing complex and ever-changing operating environments and increasingly demanding energy efficiency requirements. In particular, when it comes to balancing cost-effectiveness and operational safety, the single power supply system often fails to achieve the desired results.

[0004] However, existing trolleybus systems suffer from several technical challenges. The most prominent is the difficulty in simultaneously achieving cost-effectiveness and operational safety using a single power supply method. On the one hand, pursuing cost-effectiveness necessitates sacrificing some safety performance; on the other hand, overemphasizing safety leads to a significant increase in costs, impacting the overall economic viability of the system. Furthermore, existing power supply systems lack sufficient flexibility and adaptability to different operating conditions, hindering the optimal selection of power supply methods. These issues, to some extent, restrict the further development and application of mobile charging intelligent rail transit power supply systems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a mobile charging intelligent rail transit power supply system and its power supply method. Through technological innovation, this invention overcomes the technical pain points of existing power supply systems, providing strong support for the further development and application of mobile charging intelligent rail transit power supply systems. Specifically, this invention proposes an efficient, safe, and flexible power supply solution that can meet the higher requirements of future vehicles for power supply systems, promoting sustainable development in the vehicle industry.

[0006] To solve the above-mentioned technical problems, the specific technical solution of the present invention is as follows:

[0007] In a first aspect, the present invention provides a mobile charging intelligent rail transit power supply system, comprising:

[0008] High-voltage transmission lines: used to transmit 10KV / 35KV alternating current;

[0009] Charging rectifier: Used to convert AC power transmitted by high-voltage transmission lines into DC or AC power of a specific voltage level.

[0010] Contact wire: Used as a transmission medium for direct current or alternating current, it contacts the pantograph to supply power to vehicles and roads. Contact wire includes DC1500V-0, DC+750V-750V and AC2000V.

[0011] Pantograph: Installed on a vehicle and in contact with the overhead contact line to transfer electrical energy from the contact line into the vehicle.

[0012] DC-DC converter: used to step down the current in the contact wire, converting DC1500V-0, DC+750V--750V or AC2000V into voltages that meet the requirements of the equipment inside the vehicle.

[0013] Inverter: Used to convert direct current to alternating current, or to convert alternating current back to a voltage level suitable for vehicle use;

[0014] Permanent magnet synchronous AC motor: used to receive AC power from the inverter as the power source for the vehicle;

[0015] Control device: Establishes electrical connection with high-voltage transmission lines, charging rectifiers, contact networks, pantographs, DC-DC converters, inverters, and permanent magnet synchronous AC motors. The control device is used to send control commands to high-voltage transmission lines, charging rectifiers, contact networks, pantographs, DC-DC converters, inverters, and permanent magnet synchronous AC motors.

[0016] The control commands include the high-voltage transmission line delivering AC power to the charging rectifier, where it is converted into DC or AC power of a specific voltage level and transmitted to the contact network. The contact network contacts the pantograph, introducing electrical energy into the vehicle. Inside the vehicle, the electrical energy is stepped down by a DC-DC converter to meet the voltage requirements of the vehicle's internal equipment. The inverter converts the electrical energy into AC power suitable for the vehicle, driving the permanent magnet synchronous AC motor to operate the vehicle's equipment.

[0017] Furthermore, the mobile charging intelligent rail transit power supply system provided by the present invention includes a control device comprising: an intelligent power supply management unit, a multi-standard compatible unit, and a contact network power supply unit.

[0018] The intelligent power supply management unit sends instructions to the multi-standard compatible unit to identify the standard of the current external power supply and adjust the power conversion strategy according to the identification result;

[0019] The multi-standard compatible unit feeds back the converted power status information to the intelligent power supply management unit, and at the same time provides the overhead contact line power supply unit with power that conforms to the internal standards of the system.

[0020] The overhead contact line power supply unit receives electrical energy from the multi-standard compatible unit and transmits it to the vehicle, while reporting the contact status and power transmission status to the intelligent power supply management unit.

[0021] Furthermore, in the mobile charging intelligent rail transit power supply system provided by the present invention, the intelligent power supply management unit is also used for:

[0022] Real-time data is collected from the high-voltage transmission lines, charging rectifier stations, and contact networks of the power supply system. The real-time data includes voltage, current, power factor, and temperature parameters.

[0023] The collected real-time data is preprocessed, and the processed data is integrated to form a dataset that can be analyzed.

[0024] The integrated dataset is analyzed in depth using data analysis algorithms. By comparing historical data with preset standards, the efficiency of system operation is identified. The efficiency of system operation includes power transmission efficiency and equipment utilization.

[0025] The system uses a pre-defined fault prediction algorithm to predict the future state of the power supply system and assesses the probability of a fault and the scope of its impact based on historical fault data and the current system operating status.

[0026] When the analysis results show that there is a potential fault risk or predict that a fault is about to occur, the intelligent power supply management unit triggers the early warning mechanism of the background management system's early warning unit;

[0027] The back-end management system's early warning unit establishes a connection with the intelligent power supply management unit. The back-end management system's early warning unit collects real-time system operation status data from the intelligent power supply management unit. The system operation status data from the intelligent power supply management unit includes voltage, current, power factor, temperature parameters, and abnormal status data.

[0028] Based on historical data, industry standards, and system requirements, warning thresholds are set, including voltage fluctuation range, current overload threshold, and temperature limit.

[0029] Real-time monitoring of system operation status data, comparison of the monitoring system operation status data with early warning thresholds, and assessment of whether the system is in a normal or early warning state;

[0030] When the monitoring system's operating status data exceeds the warning threshold, the warning unit of the back-end management system automatically triggers the warning mechanism and generates warning information.

[0031] Furthermore, in the mobile charging intelligent rail transit power supply system provided by the present invention, the multi-standard compatible unit is also used for:

[0032] Monitor the external power source connected to the power supply system, identify whether the power type is DC or AC, and determine the specific frequency of AC power.

[0033] The identified external power supply type is compared with the standard type inside the power supply system.

[0034] Determine whether the external power supply system is compatible with the internal equipment of the power supply system, and whether a system conversion is required;

[0035] If it is determined that the external power supply system is incompatible with the internal power supply system, the multi-system compatible unit will prepare to perform power conversion.

[0036] Initiate the power conversion process to convert electrical energy from an external power source into a form of electrical energy that is uniformly used within the power supply system;

[0037] For direct current (DC), this includes voltage level adjustment; for alternating current (AC), it includes frequency conversion and voltage adjustment.

[0038] Furthermore, in the mobile charging intelligent rail transit power supply system provided by the present invention, the overhead contact line power supply unit is also used for:

[0039] Sensors installed on the overhead contact line and pantograph are used to monitor the contact status between the two in real time.

[0040] The monitoring parameters include contact pressure, wear of the contact surface, and temperature change of the contact wire;

[0041] Based on real-time monitoring of the contact status, the transmission process of electrical energy from the overhead contact line to the vehicle is controlled. The transmission power is dynamically adjusted according to the actual needs of the vehicle, including acceleration, deceleration, and constant speed driving.

[0042] Continuously monitor the operating status of the overhead contact line and pantograph, as well as any abnormalities in the power transmission process. Through data analysis and comparison, detect potential fault points, including contact line breakage and excessive pantograph wear.

[0043] Secondly, the present invention provides a mobile charging intelligent rail transit power supply method, applied to the aforementioned mobile charging intelligent rail transit power supply system, comprising:

[0044] Step S101: The high-voltage transmission line is responsible for delivering 10KV / 35KV AC power to the charging rectifier station. Inside the charging rectifier station, the AC power is converted into DC or AC power of a specific voltage level.

[0045] Step S102: The converted electrical energy is transmitted to the contact network. The contact network, as the medium for transmitting electrical energy, introduces electrical energy into the vehicle through contact with the pantograph. The contact network includes DC1500V-0, DC+750V--750V and AC2000V.

[0046] Step S103: Inside the vehicle, the introduced current DC1500V-0, DC+750V--750V and AC2000V are stepped down by a DC-DC converter to be converted into voltages that meet the requirements of the equipment inside the vehicle. The inverter converts the DC power into AC power that is suitable for the vehicle.

[0047] Step S104: The AC power converted by the inverter is used to drive the permanent magnet synchronous AC motor, which serves as the power source for the vehicle and drives the vehicle equipment to operate.

[0048] Step S105: The control device establishes an electrical connection with the high-voltage transmission line, charging rectifier, contact network, pantograph, DC-DC converter, inverter, and permanent magnet synchronous AC motor. The control device is responsible for sending control commands to the high-voltage transmission line, charging rectifier, contact network, pantograph, DC-DC converter, inverter, and permanent magnet synchronous AC motor.

[0049] Furthermore, in the mobile charging intelligent rail transit power supply method provided by the present invention, step S105 includes:

[0050] Step S501: The intelligent power supply management unit sends an instruction to the multi-standard compatibility unit to identify the standard of the current external power supply and adjust the power conversion strategy according to the identification result.

[0051] In step S502, the multi-standard compatible unit feeds back the converted power status information to the intelligent power supply management unit, and at the same time provides the contact network power supply unit with power that conforms to the internal standards of the system.

[0052] In step S503, the overhead contact line power supply unit receives electrical energy from the multi-standard compatible unit and transmits it to the vehicle, while simultaneously reporting the contact status and power transmission status to the intelligent power supply management unit.

[0053] Furthermore, in the mobile charging intelligent rail transit power supply method provided by the present invention, step S501 includes:

[0054] Real-time data is collected from the high-voltage transmission lines, charging rectifier stations, and contact networks of the power supply system. The real-time data includes voltage, current, power factor, and temperature parameters.

[0055] The collected real-time data is preprocessed, and the processed data is integrated to form a dataset that can be analyzed.

[0056] The integrated dataset is analyzed in depth using data analysis algorithms. By comparing historical data with preset standards, the efficiency of system operation is identified. The efficiency of system operation includes power transmission efficiency and equipment utilization.

[0057] The system uses a pre-defined fault prediction algorithm to predict the future state of the power supply system and assesses the probability of a fault and the scope of its impact based on historical fault data and the current system operating status.

[0058] When the analysis results show that there is a potential fault risk or predict that a fault is about to occur, the intelligent power supply management unit triggers the early warning mechanism of the background management system's early warning unit;

[0059] The back-end management system's early warning unit establishes a connection with the intelligent power supply management unit. The back-end management system's early warning unit collects real-time system operation status data from the intelligent power supply management unit. The system operation status data from the intelligent power supply management unit includes voltage, current, power factor, temperature parameters, and abnormal status data.

[0060] Based on historical data, industry standards, and system requirements, warning thresholds are set, including voltage fluctuation range, current overload threshold, and temperature limit.

[0061] Real-time monitoring of system operation status data, comparison of the monitoring system operation status data with early warning thresholds, and assessment of whether the system is in a normal or early warning state;

[0062] When the monitoring system's operating status data exceeds the warning threshold, the warning unit of the back-end management system automatically triggers the warning mechanism and generates warning information.

[0063] Furthermore, in the mobile charging intelligent rail transit power supply method provided by the present invention, step S502 includes:

[0064] Monitor the external power source connected to the power supply system, identify whether the power type is DC or AC, and determine the specific frequency of AC power.

[0065] The identified external power supply type is compared with the standard type inside the power supply system.

[0066] Determine whether the external power supply system is compatible with the internal equipment of the power supply system, and whether a system conversion is required;

[0067] If it is determined that the external power supply system is incompatible with the internal power supply system, the multi-system compatible unit will prepare to perform power conversion.

[0068] Initiate the power conversion process to convert electrical energy from an external power source into a form of electrical energy that is uniformly used within the power supply system;

[0069] For direct current (DC), this includes voltage level adjustment; for alternating current (AC), it includes frequency conversion and voltage adjustment.

[0070] Furthermore, in the mobile charging intelligent rail transit power supply method provided by the present invention, step S503 includes:

[0071] Sensors installed on the overhead contact line and pantograph are used to monitor the contact status between the two in real time.

[0072] The monitoring parameters include contact pressure, wear of the contact surface, and temperature change of the contact wire;

[0073] Based on real-time monitoring of the contact status, the transmission process of electrical energy from the overhead contact line to the vehicle is controlled. The transmission power is dynamically adjusted according to the actual needs of the vehicle, including acceleration, deceleration, and constant speed driving.

[0074] Continuously monitor the operating status of the overhead contact line and pantograph, as well as any abnormalities in the power transmission process. Through data analysis and comparison, detect potential fault points, including contact line breakage and excessive pantograph wear.

[0075] The beneficial effects of this invention are mainly reflected in the following aspects:

[0076] Through the multi-standard compatibility unit, the system can automatically identify and switch the external power supply standard, enabling the power supply system to adapt to different power supply environments and improving the system's flexibility and adaptability.

[0077] The intelligent power supply management unit collects data from various parts of the system (such as high-voltage transmission lines, charging rectifier stations, and contact networks) in real time, and uses data analysis algorithms and fault prediction algorithms to optimize system operation, thereby improving power transmission efficiency and equipment utilization.

[0078] The intelligent power supply management unit can monitor the real-time operating status of the system, predict potential fault risks through data analysis, and trigger early warning mechanisms in a timely manner (including audible and visual alarms, SMS notifications, and email notifications), effectively reducing the occurrence of faults and shortening fault response time.

[0079] The overhead contact line power supply unit uses sensors to monitor the contact status between the overhead contact line and the pantograph in real time, and dynamically adjusts the transmission power according to the actual needs of the vehicle (such as acceleration, deceleration, and constant speed driving), thereby improving the stability and efficiency of power transmission.

[0080] The combined use of inverters and DC-DC converters enables the system to flexibly convert electrical energy into voltage and current forms suitable for use by in-vehicle equipment, improving the system's versatility and compatibility.

[0081] In summary, this invention, through technological innovation and intelligent management, effectively addresses the pain points of existing mobile charging intelligent rail transit power supply systems in terms of cost-effectiveness, operational safety, flexibility, and reliability, providing strong support for the further development and application of mobile charging intelligent rail transit power supply systems. Attached Figure Description

[0082] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0083] Figure 1 This is a schematic diagram of a mobile charging intelligent rail transit power supply method provided in an embodiment of the present invention.

[0084] Figure 2 A schematic diagram of the vehicle power supply method provided by the present invention. Detailed Implementation

[0085] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. The technical solutions provided by various embodiments of this invention will be described in detail below with reference to the accompanying drawings.

[0086] To better understand the purpose of this invention, the invention will be described in further detail below.

[0087] In a first aspect, the present invention provides a mobile charging intelligent rail transit power supply system, comprising:

[0088] High-voltage transmission lines: used to transmit 10KV / 35KV alternating current;

[0089] Charging rectifier: Used to convert AC power transmitted by high-voltage transmission lines into DC or AC power of a specific voltage level.

[0090] Contact wire: Used as a transmission medium for direct current or alternating current, it contacts the pantograph to supply power to vehicles and roads. Contact wire includes DC1500V-0, DC+750V-750V and AC2000V.

[0091] Pantograph: Installed on a vehicle and in contact with the overhead contact line to transfer electrical energy from the contact line into the vehicle.

[0092] DC-DC converter: used to step down the current in the contact wire, converting DC1500V-0, DC+750V--750V or AC2000V into voltages that meet the requirements of the equipment inside the vehicle.

[0093] Inverter: Used to convert direct current to alternating current, or to convert alternating current back to a voltage level suitable for vehicle use;

[0094] Permanent magnet synchronous AC motor: used to receive AC power from the inverter as the power source for the vehicle;

[0095] Control device: Establishes electrical connection with high-voltage transmission lines, charging rectifiers, contact networks, pantographs, DC-DC converters, inverters, and permanent magnet synchronous AC motors. The control device is used to send control commands to high-voltage transmission lines, charging rectifiers, contact networks, pantographs, DC-DC converters, inverters, and permanent magnet synchronous AC motors.

[0096] The control commands include the high-voltage transmission line delivering AC power to the charging rectifier, where it is converted into DC or AC power of a specific voltage level and transmitted to the contact network. The contact network contacts the pantograph, introducing electrical energy into the vehicle. Inside the vehicle, the electrical energy is stepped down by a DC-DC converter to meet the voltage requirements of the vehicle's internal equipment. The inverter converts the electrical energy into AC power suitable for the vehicle, driving the permanent magnet synchronous AC motor to operate the vehicle's equipment.

[0097] In the invention, the overhead contact system is designed to support three different power supply systems to adapt to different power supply environments and vehicle requirements. The following are embodiments of these three power supply systems in the invention:

[0098] Example of DC1500V-0 power supply system:

[0099] The overhead contact system uses a 1500V DC positive power supply. The 10KV / 35KV AC power transmitted from the high-voltage transmission lines is converted to 1500V DC in the charging rectifier substation before being transmitted to the contact network. The pantograph contacts the contact network, introducing electrical energy into the vehicle. Inside the vehicle, the electrical energy is first stepped down by a DC-DC converter to meet the voltage requirements of the vehicle's internal equipment. An inverter then converts the DC power into AC power suitable for the vehicle, ultimately driving the permanent magnet synchronous AC motor.

[0100] DC±750V Power Supply Implementation Example: Although this invention primarily describes the DC1500V power supply system, the design of the multi-system compatible unit allows the system to support other DC power supply systems such as DC±750V. When the external power supply is DC±750V, the multi-system compatible unit will automatically identify and perform the necessary voltage conversion. The conversion process includes adjusting the DC±750V power to the system's internal unified DC1500V or other voltage level suitable for vehicle equipment, then transmitting it to the contact network, and finally introducing it into the vehicle for use via the pantograph.

[0101] AC2000V Power Supply System Implementation Example: For the AC2000V AC power supply system, the external AC power first enters the charging rectifier. At this point, the AC power can be directly transmitted to the multi-standard compatible unit, either directly or without rectification. If voltage or frequency adjustment is required, the multi-standard compatible unit will initiate a conversion process, converting the AC2000V power to a voltage level suitable for vehicle use, such as DC1500V or other DC voltages, or directly to an AC voltage level suitable for vehicle equipment. The converted power is transmitted to the vehicle through the overhead contact line, with the pantograph contacting the contact line and introducing the power into the vehicle's interior. Inside the vehicle, the inverter does not need to operate (if the AC voltage is already suitable for the vehicle), or it converts the AC power to the specific voltage and frequency required by the vehicle's internal equipment.

[0102] The support for three power supply systems in this invention makes the mobile charging intelligent rail transit power supply system provided by this invention more flexible and adaptable.

[0103] High-voltage transmission lines are lines used to transmit high-voltage alternating current (10KV / 35KV), responsible for transmitting electricity from power plants or substations to charging rectifier stations.

[0104] Charging rectifier: Responsible for receiving alternating current (AC) from high-voltage transmission lines and converting it into direct current (DC) or alternating current at specific voltage levels. This conversion is necessary because different electrical devices require different forms and voltage levels of electrical energy to operate normally.

[0105] The overhead contact line is a special power supply network that exists in the form of a 1500V DC overhead positive pole. As the transmission medium for electrical energy (whether DC or AC), it supplies electrical energy to dual-source heavy trucks through contact with the pantograph on the vehicle.

[0106] Pantograph: A device installed on a dual-source heavy truck. Its main function is to maintain contact with the overhead contact line, thereby introducing electrical energy from the contact line into the vehicle.

[0107] DC-DC converter: This device is used to step down the DC power supplied from the overhead contact line to meet the voltage requirements of the vehicle's internal equipment. This is because the electrical equipment inside the vehicle cannot directly withstand the high voltage from the overhead contact line.

[0108] Inverters: Inverters play an important role in power supply systems, converting direct current (DC) to alternating current (AC) or converting AC back to a voltage level suitable for vehicles. This flexibility allows power supply systems to adapt to the diverse needs of different electrical devices.

[0109] Permanent magnet synchronous AC motor: The power source for dual-source heavy-duty trucks. The permanent magnet synchronous AC motor receives AC power from the inverter and converts it into mechanical energy, thereby driving the dual-source heavy-duty truck. Dual-source heavy-duty trucks refer to heavy-duty trucks that use both grid and battery power. It combines high-voltage power supply with new energy vehicle technology. The two electric components on the dual-source heavy-duty truck are called pantographs. When the truck is traveling on an electrified road, it draws power from the grid through the pantograph to drive the vehicle and charge the onboard battery. When the vehicle overtakes or leaves the electrified road, the pantograph automatically lowers, switching to battery power for driving. The "mobile charging" and "synchronous charging and use" method provided by this invention effectively solves the two major technical challenges of "range" and "charging" for electric heavy-duty trucks, improving the transportation efficiency of dual-source heavy-duty trucks.

[0110] Control unit: Establishes electrical connections with all other parts of the power supply system (including high-voltage transmission lines, charging rectifiers, contact networks, pantographs, DC-DC converters, inverters, and permanent magnet synchronous AC motors). The control unit is responsible for sending control commands to the components to improve the coordinated, efficient, and safe operation of the entire power supply system.

[0111] In summary, the technical solution of this invention provides a highly integrated and collaborative mobile charging intelligent rail transit power supply system. From high-voltage power transmission to vehicle power output, every link has been designed and optimized to improve the stable power supply of the mobile charging intelligent rail transit power supply system and the efficient operation of dual-source heavy trucks.

[0112] Specifically, the mobile charging intelligent rail transit power supply system provided by the present invention includes a control device comprising: an intelligent power supply management unit, a multi-standard compatible unit, and a contact network power supply unit.

[0113] The intelligent power supply management unit sends instructions to the multi-standard compatible unit to identify the standard of the current external power supply and adjust the power conversion strategy according to the identification result;

[0114] The multi-standard compatible unit feeds back the converted power status information to the intelligent power supply management unit, and at the same time provides the overhead contact line power supply unit with power that conforms to the internal standards of the system.

[0115] The overhead contact line power supply unit receives electrical energy from the multi-standard compatible unit and transmits it to the vehicle, while reporting the contact status and power transmission status to the intelligent power supply management unit.

[0116] Specifically, in the mobile charging intelligent rail transit power supply system provided by the present invention, the intelligent power supply management unit is further used for:

[0117] Real-time data is collected from the high-voltage transmission lines, charging rectifier stations, and contact networks of the power supply system. The real-time data includes voltage, current, power factor, and temperature parameters.

[0118] The collected real-time data is preprocessed, and the processed data is integrated to form a dataset that can be analyzed.

[0119] The integrated dataset is analyzed in depth using data analysis algorithms. By comparing historical data with preset standards, the efficiency of system operation is identified. The efficiency of system operation includes power transmission efficiency and equipment utilization.

[0120] The system uses a pre-defined fault prediction algorithm to predict the future state of the power supply system and assesses the probability of a fault and the scope of its impact based on historical fault data and the current system operating status.

[0121] When the analysis results show that there is a potential fault risk or predict that a fault is about to occur, the intelligent power supply management unit triggers the early warning mechanism of the background management system's early warning unit;

[0122] The back-end management system's early warning unit establishes a connection with the intelligent power supply management unit. The back-end management system's early warning unit collects real-time system operation status data from the intelligent power supply management unit. The system operation status data from the intelligent power supply management unit includes voltage, current, power factor, temperature parameters, and abnormal status data.

[0123] Based on historical data, industry standards, and system requirements, warning thresholds are set, including voltage fluctuation range, current overload threshold, and temperature limit.

[0124] Real-time monitoring of system operation status data, comparison of the monitoring system operation status data with early warning thresholds, and assessment of whether the system is in a normal or early warning state;

[0125] When the monitoring system's operating status data exceeds the warning threshold, the warning unit of the back-end management system automatically triggers the warning mechanism and generates warning information.

[0126] As the core of the control device, the intelligent power supply management unit is responsible for comprehensively monitoring and managing the operation of the power supply system. It has the ability to send commands to multi-standard compatible units to identify the current external power supply standard. This identification function is crucial for improving the system's adaptability to different power environments. Based on the identification results, the intelligent power supply management unit adjusts the power conversion strategy to ensure that power is transmitted to the vehicle in the most efficient and safest way. Furthermore, it receives status information from the multi-standard compatible units and the overhead contact line power supply unit, thereby achieving real-time monitoring of the entire power supply system's status.

[0127] Specifically, in the mobile charging intelligent rail transit power supply system provided by the present invention, the multi-standard compatible unit is further used for:

[0128] Monitor the external power source connected to the power supply system, identify whether the power type is DC or AC, and determine the specific frequency of AC power.

[0129] The identified external power supply type is compared with the standard type inside the power supply system.

[0130] Determine whether the external power supply system is compatible with the internal equipment of the power supply system, and whether a system conversion is required;

[0131] If it is determined that the external power supply system is incompatible with the internal power supply system, the multi-system compatible unit will prepare to perform power conversion.

[0132] Initiate the power conversion process to convert electrical energy from an external power source into a form of electrical energy that is uniformly used within the power supply system;

[0133] For direct current (DC), this includes voltage level adjustment; for alternating current (AC), it includes frequency conversion and voltage adjustment.

[0134] The multi-system compatibility unit is a key component in the control device for achieving power system compatibility. It receives instructions from the intelligent power supply management unit, identifies and adapts to different external power supply systems, such as AC or DC, and different voltage levels. Upon identifying the power supply system, the multi-system compatibility unit performs necessary power conversion to ensure the power meets the system's internal standards. The converted power status information is fed back to the intelligent power supply management unit. Simultaneously, the multi-system compatibility unit is also responsible for providing standard-compliant power to the overhead contact line power supply unit.

[0135] Specifically, in the mobile charging intelligent rail transit power supply system provided by the present invention, the overhead contact line power supply unit is further used for:

[0136] Sensors installed on the overhead contact line and pantograph are used to monitor the contact status between the two in real time.

[0137] The monitoring parameters include contact pressure, wear of the contact surface, and temperature changes of the contact wire;

[0138] Based on real-time monitoring of the contact status, the transmission process of electrical energy from the overhead contact line to the vehicle is controlled. The transmission power is dynamically adjusted according to the actual needs of the vehicle, including acceleration, deceleration, and constant speed driving.

[0139] Continuously monitor the operating status of the overhead contact line and pantograph, as well as any abnormalities in the power transmission process. Through data analysis and comparison, detect potential fault points, including contact line breakage and excessive pantograph wear.

[0140] The overhead contact line power supply unit acts as a bridge connecting the power supply system and the vehicle, responsible for the safe and efficient transmission of electrical energy to the vehicle. It receives electrical energy from multi-standard compatible units and transmits it to the vehicle via the overhead contact line. Simultaneously, it monitors the contact status between the overhead contact line and the vehicle's pantograph, improving the stability and reliability of power transmission. The overhead contact line power supply unit also reports the contact status and power transmission conditions to the intelligent power supply management unit for real-time adjustments and optimizations.

[0141] Secondly, the present invention provides a mobile charging intelligent rail transit power supply method, applied to the aforementioned mobile charging intelligent rail transit power supply system, comprising:

[0142] Step S101: The high-voltage transmission line is responsible for delivering 10KV / 35KV AC power to the charging rectifier station. Inside the charging rectifier station, the AC power is converted into DC or AC power of a specific voltage level.

[0143] Step S102: The converted electrical energy is transmitted to the contact network. The contact network, as the medium for transmitting electrical energy, introduces electrical energy into the vehicle through contact with the pantograph. The contact network includes DC1500V-0, DC+750V--750V and AC2000V.

[0144] Step S103: Inside the vehicle, the introduced current DC1500V-0, DC+750V--750V and AC2000V are stepped down by a DC-DC converter to be converted into voltages that meet the requirements of the equipment inside the vehicle. The inverter converts the DC power into AC power that is suitable for the vehicle.

[0145] Step S104: The AC power converted by the inverter is used to drive the permanent magnet synchronous AC motor, which serves as the power source for the vehicle and drives the vehicle equipment to operate.

[0146] Step S105: The control device establishes an electrical connection with the high-voltage transmission line, charging rectifier, contact network, pantograph, DC-DC converter, inverter, and permanent magnet synchronous AC motor. The control device is responsible for sending control commands to the high-voltage transmission line, charging rectifier, contact network, pantograph, DC-DC converter, inverter, and permanent magnet synchronous AC motor.

[0147] Specifically, the mobile charging intelligent rail transit power supply method provided by the present invention includes step S105, which comprises:

[0148] Step S501: The intelligent power supply management unit sends an instruction to the multi-standard compatibility unit to identify the standard of the current external power supply and adjust the power conversion strategy according to the identification result.

[0149] In step S502, the multi-standard compatible unit feeds back the converted power status information to the intelligent power supply management unit, and at the same time provides the contact network power supply unit with power that conforms to the internal standards of the system.

[0150] In step S503, the overhead contact line power supply unit receives electrical energy from the multi-standard compatible unit and transmits it to the vehicle, while simultaneously reporting the contact status and power transmission status to the intelligent power supply management unit.

[0151] Specifically, the mobile charging intelligent rail transit power supply method provided by the present invention includes step S501, which comprises:

[0152] Real-time data is collected from the high-voltage transmission lines, charging rectifier stations, and contact networks of the power supply system. The real-time data includes voltage, current, power factor, and temperature parameters.

[0153] The collected real-time data is preprocessed, and the processed data is integrated to form a dataset that can be analyzed.

[0154] The integrated dataset is analyzed in depth using data analysis algorithms. By comparing historical data with preset standards, the efficiency of system operation is identified. The efficiency of system operation includes power transmission efficiency and equipment utilization.

[0155] The system uses a pre-defined fault prediction algorithm to predict the future state of the power supply system and assesses the probability of a fault and the scope of its impact based on historical fault data and the current system operating status.

[0156] When the analysis results show potential fault risks or predict an impending fault, the intelligent power supply management unit triggers an early warning mechanism.

[0157] Warnings include audible and visual alarms, SMS notifications, and email notifications.

[0158] Specifically, the mobile charging intelligent rail transit power supply method provided by the present invention includes step S502, which comprises:

[0159] Monitor the external power source connected to the power supply system, identify whether the power type is DC or AC, and determine the specific frequency of AC power.

[0160] The identified external power supply type is compared with the standard type inside the power supply system.

[0161] Determine whether the external power supply system is compatible with the internal equipment of the power supply system, and whether a system conversion is required;

[0162] If it is determined that the external power supply system is incompatible with the internal power supply system, the multi-system compatible unit will prepare to perform power conversion.

[0163] Initiate the power conversion process to convert electrical energy from an external power source into a form of electrical energy that is uniformly used within the power supply system;

[0164] For direct current (DC), this includes voltage level adjustment; for alternating current (AC), it includes frequency conversion and voltage adjustment.

[0165] Specifically, the mobile charging intelligent rail transit power supply method provided by the present invention includes step S503, which includes:

[0166] Sensors installed on the overhead contact line and pantograph are used to monitor the contact status between the two in real time.

[0167] The monitoring parameters include contact pressure, wear of the contact surface, and temperature change of the contact wire;

[0168] Based on real-time monitoring of the contact status, the transmission process of electrical energy from the overhead contact line to the vehicle is controlled. The transmission power is dynamically adjusted according to the actual needs of the vehicle, including acceleration, deceleration, and constant speed driving.

[0169] Continuously monitor the operating status of the overhead contact line and pantograph, as well as any abnormalities in the power transmission process. Through data analysis and comparison, detect potential fault points, including contact line breakage and excessive pantograph wear.

[0170] This invention effectively solves several technical pain points in existing mobile charging intelligent rail transit power supply systems through its technical solution, mainly in the following aspects:

[0171] In existing technologies, a single power supply system is insufficient to balance cost-effectiveness and operational safety. This invention utilizes a multi-system compatible unit to achieve automatic identification and conversion of external power supply systems, thereby improving the system's flexibility and adaptability.

[0172] The intelligent power supply management unit collects data from various parts of the system (such as high-voltage transmission lines, charging rectifiers, and overhead contact lines) in real time, and uses data analysis algorithms and fault prediction algorithms to optimize system operation and improve power transmission efficiency and equipment utilization.

[0173] The intelligent power supply management unit can monitor the real-time operating status of the system, predict potential fault risks through data analysis, and trigger early warning mechanisms in a timely manner, such as audible and visual alarms, SMS notifications, and email notifications, effectively reducing the occurrence of faults and shortening fault response time. The overhead contact line power supply unit uses sensors to monitor the contact status between the overhead contact line and the pantograph in real time, and dynamically adjusts the transmission power according to the actual needs of the vehicle (such as acceleration, deceleration, and constant speed driving), improving the stability and efficiency of power transmission.

[0174] The combined use of an inverter and a DC-DC converter enables the system to flexibly convert electrical energy into voltage and current forms suitable for use with in-vehicle equipment, improving the system's versatility and compatibility. Through intelligent monitoring and management, this invention not only improves system operating efficiency but also reduces system maintenance costs and enhances the overall user experience.

[0175] In summary, this invention, through technological innovation and intelligent management, effectively addresses the pain points of existing mobile charging intelligent rail transit power supply systems in terms of cost-effectiveness, operational safety, flexibility, and reliability, providing strong support for the further development and application of mobile charging intelligent rail transit power supply systems.

[0176] In the technical solution of this invention, the overhead contact line, as a key component for power transmission, is designed to adapt to different power supply systems to meet the needs of different mobile charging intelligent rail transit systems. The three overhead contact line power supply systems are DC1500V, DC±750V, and AC2000V. Their specific applications in this invention are as follows:

[0177] DC1500V Power Supply System: In this invention, the overhead contact line is primarily designed with a DC 1500V positive power supply, which is consistent with the DC1500V power supply system you mentioned. This high-voltage DC power supply system can provide a large power transmission capacity, meeting the needs of high-power dual-source heavy-duty trucks.

[0178] After the DC1500V power is transmitted to the vehicle through the overhead contact line, it is first stepped down by a DC-DC converter inside the vehicle to meet the voltage requirements of different devices inside the vehicle. Although this invention is designed for DC1500V power supply, through a multi-standard compatibility unit, the system can automatically identify and convert the external power supply standard to achieve compatibility with the DC1500V overhead contact line power supply standard.

[0179] DC±750V Power Supply: Although this invention primarily describes the DC1500V power supply system, the design of the multi-system compatible unit allows the system to support other DC power supply systems such as DC±750V. When the external power supply is DC±750V, the multi-system compatible unit will perform necessary voltage adjustments or conversions to enable the contact network to output standard DC1500V power.

[0180] Conversion Mechanism: The multi-standard compatible unit identifies the voltage level of the external power supply and initiates the power conversion process, converting DC±750V power into the unified DC1500V power form within the system.

[0181] AC2000V Power Supply: The system is also compatible with AC2000V power supply systems. Through the identification and conversion function of the multi-system compatible unit, external AC power (such as AC2000V) can be converted into the DC power (such as DC1500V) required by the system, or directly converted into an AC voltage level suitable for vehicle use.

[0182] First, the AC power needs to be converted to DC power in the charging rectifier, and then further adjusted to the voltage level required by the contact network (such as DC 1500V) by a multi-standard compatible unit. Alternatively, it can be directly converted to the AC voltage level suitable for the vehicle equipment and supplied to the permanent magnet synchronous AC motor through an inverter.

[0183] Throughout the conversion and transmission process, the control device, intelligent power supply management unit, multi-standard compatible unit, and overhead contact line power supply unit work closely together to ensure stable and efficient power transmission.

[0184] In summary, the mobile charging intelligent rail transit power supply system of the present invention, through the design of multi-standard compatible units, achieves broad support for different overhead contact line power supply standards, including DC1500V, DC±750V and AC2000V, thereby improving the system's flexibility and adaptability.

[0185] From economic, technical, and technical effectiveness perspectives, a comprehensive comparison is made between the three power supply systems: DC1500V, DC±750V, and AC2000V. The specific comparison content is as follows:

[0186] This paper compares the three power supply systems, DC1500V, DC±750V and AC2000V, from an economic perspective.

[0187] The economic advantages of DC1500V power supply: DC 1500V has a higher voltage level, which can reduce power loss during transmission and thus improve transmission efficiency. DC1500V power supply is widely used and highly standardized, which is conducive to reducing equipment procurement and maintenance costs.

[0188] The economic disadvantages of DC1500V power supply: For some systems, a large initial investment is required to upgrade or replace existing equipment to support DC1500V power supply.

[0189] The advantages of DC±750V power supply from an economic perspective: For systems already using DC750V, the upgrade cost is relatively low, requiring only simple voltage adjustments. It is suitable for occasions where the power demand is not particularly high, and is economical.

[0190] The disadvantages of DC±750V power supply from an economic perspective: due to the relatively low voltage level, the power loss during transmission is relatively large, making it unsuitable for tram systems with high power requirements.

[0191] The economic advantages of AC2000V power supply: Alternating current has a wide range of applications and is easy to be compatible with other power systems. Many electrical devices can use AC power directly, reducing investment in conversion equipment.

[0192] The economic disadvantages of the AC2000V power supply system include: in some cases, it is necessary to convert AC power to DC power for vehicle use, increasing the cost of conversion equipment and maintenance. Furthermore, AC power transmission losses are greater than DC power transmission losses over long distances.

[0193] This paper compares the three power supply systems, DC1500V, DC±750V and AC2000V, from a technical perspective.

[0194] Advantages of DC1500V power supply system from a technical perspective: It is suitable for high-power, long-distance trolley systems and has been used in the trolley field for many years, with mature and reliable technology.

[0195] Disadvantages of DC1500V power supply system from a technical perspective: High voltage levels require higher quality insulation materials, which increases equipment costs.

[0196] Advantages of DC±750V power supply technology: Low voltage level: Relatively low insulation requirements, lower equipment cost. The system is relatively simple, easy to maintain and troubleshoot.

[0197] The disadvantages of the DC±750V power supply system are: limited transmission capacity, making it unsuitable for applications requiring high power transmission.

[0198] The advantages of AC2000V power supply system from a technical perspective: wide compatibility with a variety of electrical equipment and systems, and the ability to flexibly adjust voltage and frequency through transformers and other equipment.

[0199] Disadvantages of AC2000V power supply system from a technical perspective: complex conversion; in situations requiring DC power, additional rectifier equipment is needed, increasing system complexity.

[0200] This paper compares the three power supply systems, DC1500V, DC±750V, and AC2000V, from a technical performance perspective.

[0201] Advantages of DC1500V power supply technology: It can provide a stable and reliable power supply, meeting the needs of high-power tram systems. By reducing energy loss during transmission, it is beneficial for energy conservation and emission reduction.

[0202] Disadvantages of DC1500V power supply technology from an effectiveness perspective: High voltage levels place higher demands on equipment, increasing equipment costs.

[0203] Advantages of DC±750V power supply technology: It is economical and efficient in low-power, short-distance trolley systems, with a simple system and low maintenance costs.

[0204] The disadvantages of DC±750V power supply technology are that its performance is limited in applications requiring high power and long-distance transmission.

[0205] The advantages of AC2000V power supply technology from an effectiveness perspective: It is suitable for various power needs and application scenarios, is flexible and diverse, and is easy to upgrade and transform as technology develops.

[0206] The disadvantages of AC2000V power supply technology from an efficiency perspective: In situations requiring DC power, its conversion efficiency is lower than that of DC power supply systems.

[0207] The current in this invention's technical solution flows from the power plant to the overhead contact line, and then to the special vehicle requiring charging. The entire power supply process involves several key steps. The power conversion steps for the three power supply systems of the overhead contact line (DC1500V-0, DC±750V, AC2000V) are as follows:

[0208] The high-voltage AC power (usually 10KV / 35KV) generated by the power plant is transmitted to the charging rectifier station via high-voltage transmission lines.

[0209] Inside the charging rectifier, AC power is converted by a rectifier into DC power of a specific voltage level (such as DC 1500V) or directly into AC power of a specific voltage level. During this process, the charging rectifier monitors and adjusts the output voltage and current to ensure that the power quality meets the requirements of subsequent power supply.

[0210] The power supply system of the overhead contact system needs to be converted accordingly to match different requirements, based on the three power supply systems of the overhead contact system (DC1500V-0, DC±750V, AC2000V).

[0211] With a DC1500V-0 power supply system, if the external power source has already been converted to DC1500V, it can be directly transmitted to the vehicle via the overhead contact line without additional conversion. During transmission, the system monitors power quality and the status of the overhead contact line to ensure safe and stable power supply.

[0212] With a DC±750V power supply, when the external power source is DC±750V, the multi-system compatibility unit first identifies the power supply system. Subsequently, the multi-system compatibility unit initiates the power conversion process, converting the DC±750V power to DC1500V or other voltage levels used internally by the system. The converted power is then transmitted to the vehicle via the overhead contact line.

[0213] For AC2000V power supply systems, if the external power source is AC2000V, the power first enters the charging rectifier for preliminary processing (including filtering and voltage regulation). After the multi-standard compatible unit identifies the power source as AC, it determines whether further voltage or frequency conversion is needed based on system requirements. If DC power is required, the AC2000V is converted to DC1500V or other DC voltage levels via a rectifier. If a specific AC voltage is required, the voltage or frequency is adjusted using a transformer or other equipment. The converted electrical energy is then transmitted to the vehicle via the overhead contact line. If the AC voltage is already suitable for the vehicle, no inverter conversion is needed, and power is supplied directly.

[0214] The electrical power processing inside the vehicle involves the pantograph contacting the overhead contact line to introduce electrical energy into the vehicle. The introduced electrical energy (whether it is DC1500V, DC±750V after conversion, or AC2000V direct power supply) is first stepped down by a DC-DC converter to meet the voltage requirements of the equipment inside the vehicle.

[0215] Inverter conversion: For devices that require AC power, the inverter converts DC power into AC power suitable for vehicles. The electrical energy drives a permanent magnet synchronous AC motor to provide power to the vehicle.

[0216] The intelligent power supply management unit collects data in real time from various components such as high-voltage transmission lines, charging rectifiers, and overhead contact lines, performs preprocessing and analysis, and assesses system operating efficiency. Utilizing data analysis algorithms and fault prediction algorithms, it predicts potential fault risks and promptly triggers early warning mechanisms (such as audible and visual alarms, SMS notifications, and email notifications). Based on vehicle driving status (acceleration, deceleration, constant speed) and overhead contact line status, it dynamically adjusts power transmission power to improve power supply stability and efficiency.

[0217] Through the above steps, this invention realizes a complete power supply process from power plant to overhead contact line and then to special vehicles, and flexibly supports multiple power supply systems, improving the flexibility, safety and efficiency of the power supply system.

[0218] In this invention, the overhead contact line is designed to support three different power supply systems: DC1500V-0, DC±750V, and AC2000V, to adapt to different power supply environments and vehicle requirements. The following details the specific application of these three power supply methods in the technical solution, and elaborate on the current conversion steps using power supply knowledge:

[0219] DC1500V-0 power supply system:

[0220] High-voltage AC input: The high-voltage AC power (usually 10KV / 35KV) generated by the power plant is transmitted to the charging rectifier station through high-voltage transmission lines.

[0221] AC rectification: Inside the charging rectifier, AC power is converted into DC power of a specific voltage level, namely DC 1500V, by a rectifier. During the rectification process, the rectifier adjusts the output voltage and current according to system requirements to ensure that the power quality meets the subsequent power supply requirements.

[0222] Power quality monitoring: Before power is transmitted to the overhead contact line, the system will conduct strict power quality monitoring, including voltage stability, current balance and harmonic content, to ensure that the power quality meets the standards.

[0223] Overhead contact line transmission: Qualified DC 1500V power is transmitted to the overhead contact line. The overhead contact line, acting as the medium for power transmission, transfers electrical energy to the pantograph on the vehicle.

[0224] Vehicle Interior Power Processing: The pantograph on the vehicle contacts the overhead contact line, introducing electrical energy into the vehicle interior. The introduced DC 1500V power is first stepped down by a DC-DC converter to meet the voltage requirements of different devices inside the vehicle. The stepped-down power can then be directly supplied to DC devices or converted to AC power by an inverter to supply AC devices.

[0225] DC±750V power supply system:

[0226] External power supply input: When the external power supply is DC±750V, the multi-system compatible unit first identifies the power supply system.

[0227] Power Conversion: Due to the mismatch between DC±750V and the DC1500V voltage level used internally by the system, the multi-standard compatible unit will initiate the power conversion process. A voltage converter (such as a boost converter) will convert the DC±750V power to DC1500V or another voltage level used internally by the system.

[0228] Subsequent steps: The converted DC1500V power will be transmitted and used in accordance with the subsequent steps of the DC1500V power supply system (contact network transmission, vehicle internal power processing, etc.).

[0229] AC2000V power supply system:

[0230] External AC power supply access: When the external power supply is AC2000V, the AC power first enters the charging rectifier for preliminary processing, including filtering, voltage stabilization and other measures to improve power quality.

[0231] If DC power is required: After the multi-standard compatible unit detects that the external power source is AC, it will determine whether the system needs DC power. If so, it will convert the AC2000V AC power to DC1500V or other DC voltage levels suitable for internal system use through a rectifier. The converted DC power will then be transmitted and used according to the subsequent steps of the DC1500V power supply standard.

[0232] If a specific AC power supply is required: If the system requires AC power at a specific voltage level, the voltage or frequency is adjusted to a level suitable for vehicle use using equipment such as transformers. The adjusted AC power is then transmitted to the vehicle via the overhead contact line, directly supplying AC equipment without the need for an inverter. Before the power is transmitted to the overhead contact line, the system performs power quality monitoring. Power that passes the monitoring is transmitted to the overhead contact line and introduced into the vehicle via the pantograph.

[0233] If the vehicle's internal equipment requires AC power, the introduced AC power can be directly supplied to the AC equipment. If DC power is required, the AC power is converted to DC power by an inverter to supply DC equipment.

[0234] Through the detailed steps described above, the technical solution of this invention can flexibly support three power supply systems: DC1500V-0, DC±750V, and AC2000V.

[0235] In the technical solution of this invention, the overhead contact line supports three different power supply systems: DC1500V-0, DC±750V, and AC2000V. The following is a detailed explanation of the conversion process between these three power supply methods:

[0236] DC1500V-0 power supply system conversion process;

[0237] Input voltage processing: High-voltage AC power (usually 10KV / 35KV) is generated from the power plant and transmitted to the charging rectifier station via high-voltage transmission lines. Inside the charging rectifier station, the AC power is stepped down by a transformer to a voltage range suitable for the rectifier's input voltage, and then input into the rectifier.

[0238] Rectification process: The rectifier converts the stepped-down AC power into DC power, usually rectified to DC 1500V, because this voltage level is common and stable in the power supply system of trams. During the rectification process, the rectifier controls the stability of the output voltage and current to improve the power quality.

[0239] Power quality monitoring: The converted DC1500V power passes through a power quality monitoring device to check indicators such as voltage stability, current balance and harmonic content, so that the power quality meets the standards.

[0240] Transmission to the overhead contact line: DC 1500V electrical energy that has passed the monitoring is transmitted to the overhead contact line through cables to provide power to the vehicles.

[0241] Vehicle Interior Processing: The pantograph on the vehicle contacts the overhead contact line, introducing electrical energy into the vehicle's interior. Inside the vehicle, the DC 1500V power is first stepped down by a DC-DC converter to meet the voltage requirements of different devices. If necessary, the DC power can also be converted to AC power by an inverter to supply AC equipment.

[0242] DC±750V power supply conversion process

[0243] External power supply identification: The multi-standard compatible unit identifies the connected external power supply as DC±750V.

[0244] Voltage Conversion: Since the system uses a uniform DC 1500V voltage level, the multi-standard compatible unit needs to initiate a voltage conversion process. A boost converter is used to boost the DC ±750V power to DC 1500V or another voltage level used within the system.

[0245] Power quality monitoring: The converted power energy passes through a power quality monitoring device to ensure that indicators such as voltage and current stability and harmonic content meet the requirements.

[0246] Transmission to the overhead contact line: Qualified electrical energy is transmitted to the overhead contact line via cables to power the vehicles and handle internal vehicle processes (same as DC1500V power supply system).

[0247] AC2000V power supply conversion process

[0248] Preliminary processing: After the external AC2000V AC power supply is connected to the system, it first enters the charging rectifier for preliminary processing, including filtering and voltage regulation, in order to improve power quality.

[0249] System type identification and conversion: DC power conversion: If the system requires DC power, the multi-system compatible unit identifies the external power source as AC and converts the AC2000V AC power to DC1500V or other DC voltage levels suitable for internal system use through a rectifier. The conversion process is similar to the rectification process for DC1500V power supply systems.

[0250] Maintaining AC power supply: If the system requires AC power of a specific voltage level, the multi-standard compatible unit adjusts the voltage and frequency to a level suitable for vehicle use via a transformer, and then transmits it directly to the overhead contact line.

[0251] Power quality monitoring: Whether converted to DC or kept AC, the converted power must pass through a power quality monitoring device to ensure that the power quality meets the requirements.

[0252] Transmission to the overhead contact line: Qualified electrical energy is transmitted to the overhead contact line via cables.

[0253] Vehicle interior handling: For DC power supply, the vehicle interior handling process is the same as for DC 1500V power supply. For AC power supply, the pantograph on the vehicle directly introduces AC power into the vehicle interior. If necessary, the voltage and current can be adjusted using a transformer or inverter to meet the requirements of the vehicle's internal equipment.

[0254] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if any modifications and variations of this invention fall within the scope of the claims of this invention and their equivalents, this invention is also intended to include such modifications and variations. The above-described embodiments of this invention do not constitute a limitation on the scope of protection of this invention.

Claims

1. A mobile charging intelligent rail transit power supply system, characterized in that, include: High-voltage transmission lines: used to transmit 10KV / 35KV alternating current; Charging rectifier: Used to convert AC power transmitted through high-voltage transmission lines into DC or AC power of a specific voltage level; Contact wire: Used as a transmission medium for direct current or alternating current, it contacts the pantograph to supply power to vehicles and roads. Contact wire includes DC1500V-0, DC+750V-750V and AC2000V. Pantograph: Installed on a vehicle and in contact with the overhead contact line to transfer electrical energy from the contact line into the vehicle. DC-DC converter: used to step down the current in the contact wire, converting DC1500V-0, DC+750V--750V or AC2000V into voltages that meet the requirements of the equipment inside the vehicle. Inverter: Used to convert direct current to alternating current, or to convert alternating current back to a voltage level suitable for vehicle use; Permanent magnet synchronous AC motor: used to receive AC power from the inverter as the power source for the vehicle; Control device: Establishes electrical connection with high-voltage transmission lines, charging rectifiers, contact networks, pantographs, DC-DC converters, inverters, and permanent magnet synchronous AC motors. The control device is used to send control commands to high-voltage transmission lines, charging rectifiers, contact networks, pantographs, DC-DC converters, inverters, and permanent magnet synchronous AC motors. The control device includes: an intelligent power supply management unit, a multi-standard compatible unit, and a contact network power supply unit; The intelligent power supply management unit is used for: Real-time data is collected from the high-voltage transmission lines, charging rectifier stations, and contact networks of the power supply system. The real-time data includes voltage, current, power factor, and temperature parameters. The collected real-time data is preprocessed, and the processed data is integrated to form a dataset that can be analyzed. The integrated dataset is analyzed in depth using data analysis algorithms. By comparing historical data with preset standards, the efficiency of system operation is identified. The efficiency of system operation includes power transmission efficiency and equipment utilization. The system uses a pre-defined fault prediction algorithm to predict the future state of the power supply system and assesses the probability of a fault and the scope of its impact based on historical fault data and the current system operating status. When the analysis results show that there is a potential fault risk or predict that a fault is about to occur, the intelligent power supply management unit triggers the early warning mechanism of the background management system early warning unit; The background management system early warning unit establishes a connection with the intelligent power supply management unit. The background management system early warning unit collects the system operation status data of the intelligent power supply management unit in real time. The system operation status data of the intelligent power supply management unit includes voltage, current, power factor, temperature parameters, and abnormal status data. Based on historical data, industry standards, and system requirements, warning thresholds are set, including voltage fluctuation range, current overload threshold, and temperature limit. Real-time monitoring of system operation status data, comparison of the monitoring system operation status data with early warning thresholds, and assessment of whether the system is in a normal or early warning state; When the monitoring system's operating status data exceeds the warning threshold, the warning unit of the back-end management system automatically triggers the warning mechanism and generates warning information; The control commands include the high-voltage transmission line delivering AC power to the charging rectifier, where it is converted into DC or AC power of a specific voltage level and transmitted to the contact network. The contact network contacts the pantograph, introducing electrical energy into the vehicle. Inside the vehicle, the electrical energy is stepped down by a DC-DC converter to meet the voltage requirements of the vehicle's internal equipment. The inverter converts the electrical energy into AC power suitable for the vehicle, driving the permanent magnet synchronous AC motor to operate the vehicle's equipment.

2. The mobile charging intelligent rail transit power supply system as described in claim 1, characterized in that, The intelligent power supply management unit sends instructions to the multi-standard compatible unit to identify the standard of the current external power supply and adjust the power conversion strategy according to the identification result; The multi-standard compatible unit feeds back the converted power status information to the intelligent power supply management unit, and at the same time provides the overhead contact line power supply unit with power that conforms to the internal standards of the system. The overhead contact line power supply unit receives electrical energy from the multi-standard compatible unit and transmits it to the vehicle, while reporting the contact status and power transmission status to the intelligent power supply management unit.

3. The mobile charging intelligent rail transit power supply system as described in claim 2, characterized in that, The multi-standard compatible unit is also used for: Monitor the external power source connected to the power supply system, identify whether the power type is DC or AC, and determine the specific frequency of AC power. The identified external power supply type is compared with the standard type inside the power supply system. Determine whether the external power supply system is compatible with the internal equipment of the power supply system, and whether a system conversion is required; If it is determined that the external power supply system is incompatible with the internal power supply system, the multi-system compatible unit will prepare to perform power conversion. Initiate the power conversion process to convert electrical energy from an external power source into the form of electrical energy used within the power supply system; For direct current (DC), this includes voltage level adjustment; for alternating current (AC), it includes frequency conversion and voltage adjustment.

4. The mobile charging intelligent rail transit power supply system as described in claim 2, characterized in that, The overhead contact line power supply unit is also used for: Sensors installed on the overhead contact line and pantograph are used to monitor the contact status between the two in real time. The monitoring parameters include contact pressure, wear of the contact surface, and temperature changes of the contact wire; Based on real-time monitoring of the contact status, the transmission of electrical energy from the overhead contact line to the vehicle is controlled, taking into account the actual needs of the vehicle, including acceleration, deceleration, constant speed driving, and dynamic adjustment of transmission power. Continuously monitor the operating status of the overhead contact line and pantograph, as well as any abnormalities in the power transmission process. Through data analysis and comparison, detect potential fault points, including contact line breakage and excessive pantograph wear.

5. A method for powering a mobile charging intelligent rail transit system, applied to the mobile charging intelligent rail transit system as described in any one of claims 1 to 4, characterized in that, include: Step S101: The high-voltage transmission line is responsible for delivering 10KV / 35KV AC power to the charging rectifier station. Inside the charging rectifier station, the AC power is converted into DC or AC power of a specific voltage level. Step S102: The converted electrical energy is transmitted to the contact network. The contact network, as the medium for transmitting electrical energy, introduces electrical energy into the vehicle through contact with the pantograph. The contact network includes DC1500V-0, DC+750V--750V and AC2000V. Step S103: Inside the vehicle, the introduced current DC1500V-0, DC+750V--750V and AC2000V are stepped down by a DC-DC converter to be converted into voltages that meet the requirements of the equipment inside the vehicle. The inverter converts the DC power into AC power that is suitable for the vehicle. Step S104: The AC power converted by the inverter is used to drive the permanent magnet synchronous AC motor, which serves as the power source for the vehicle and drives the vehicle equipment to operate. Step S105: The control device establishes an electrical connection with the high-voltage transmission line, charging rectifier, contact network, pantograph, DC-DC converter, inverter, and permanent magnet synchronous AC motor. The control device is responsible for sending control commands to the high-voltage transmission line, charging rectifier, contact network, pantograph, DC-DC converter, inverter, and permanent magnet synchronous AC motor. The control device includes: an intelligent power supply management unit, a multi-system compatible unit, and a contact network power supply unit. Step S105 further includes: Real-time data is collected from the high-voltage transmission lines, charging rectifier stations, and contact networks of the power supply system. The real-time data includes voltage, current, power factor, and temperature parameters. The collected real-time data is preprocessed, and the processed data is integrated to form a dataset that can be analyzed. The integrated dataset is analyzed in depth using data analysis algorithms. By comparing historical data with preset standards, the efficiency of system operation is identified. The efficiency of system operation includes power transmission efficiency and equipment utilization. The system uses a pre-defined fault prediction algorithm to predict the future state of the power supply system and assesses the probability of a fault and the scope of its impact based on historical fault data and the current system operating status. When the analysis results show that there is a potential fault risk or predict that a fault is about to occur, the intelligent power supply management unit triggers the early warning mechanism of the background management system's early warning unit; The back-end management system's early warning unit establishes a connection with the intelligent power supply management unit. The back-end management system's early warning unit collects real-time system operation status data from the intelligent power supply management unit. The system operation status data from the intelligent power supply management unit includes voltage, current, power factor, temperature parameters, and abnormal status data. Based on historical data, industry standards, and system requirements, warning thresholds are set, including voltage fluctuation range, current overload threshold, and temperature limit. Real-time monitoring of system operation status data, comparison of the monitoring system operation status data with early warning thresholds, and assessment of whether the system is in a normal or early warning state; When the monitoring system's operating status data exceeds the warning threshold, the warning unit of the back-end management system automatically triggers the warning mechanism and generates warning information.

6. The mobile charging intelligent rail transit power supply method as described in claim 5, characterized in that, Step S105 further includes: Step S501: The intelligent power supply management unit sends an instruction to the multi-standard compatibility unit to identify the standard of the current external power supply and adjust the power conversion strategy according to the identification result. In step S502, the multi-standard compatible unit feeds back the converted power status information to the intelligent power supply management unit, and at the same time provides the contact network power supply unit with power that conforms to the internal standards of the system. In step S503, the overhead contact line power supply unit receives electrical energy from the multi-standard compatible unit and transmits it to the vehicle, while simultaneously reporting the contact status and power transmission status to the intelligent power supply management unit.

7. The mobile charging intelligent rail transit power supply method as described in claim 6, characterized in that, Step S502 includes: Monitor the external power source connected to the power supply system, identify whether the power type is DC or AC, and determine the specific frequency of AC power. The identified external power supply type is compared with the standard type inside the power supply system. Determine whether the external power supply system is compatible with the internal equipment of the power supply system, and whether a system conversion is required; If it is determined that the external power supply system is incompatible with the internal power supply system, the multi-system compatible unit will prepare to perform power conversion. Initiate the power conversion process to convert electrical energy from an external power source into the form of electrical energy used within the power supply system; For direct current (DC), this includes voltage level adjustment; for alternating current (AC), it includes frequency conversion and voltage adjustment.

8. The mobile charging intelligent rail transit power supply method as described in claim 7, characterized in that, Step S503 includes: Sensors installed on the overhead contact line and pantograph are used to monitor the contact status between the two in real time. The monitoring parameters include contact pressure, wear of the contact surface, and temperature changes of the contact wire; Based on real-time monitoring of the contact status, the transmission process of electrical energy from the overhead contact line to the vehicle is controlled. The transmission power is dynamically adjusted according to the actual needs of the vehicle, including acceleration, deceleration, and constant speed driving. Continuously monitor the operating status of the overhead contact line and pantograph, as well as any abnormalities in the power transmission process. Through data analysis and comparison, detect potential fault points, including contact line breakage and excessive pantograph wear.

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