Power supply based on railway direct current remote supply system

Abstract

The invention discloses a power supply based on a railway direct current remote supply system, which comprises an input unit, a remote monitoring unit, an inverter, a converter, a direct current output unit and an alternating current output unit, and is characterized in that the remote monitoring unit comprises an auxiliary power supply, an MCU, a man-machine interaction unit, a signal acquisition unit and a communication interface; the auxiliary power supply, the man-machine interaction unit, the signal acquisition unit and the communication interface are electrically connected with the MCU, the input unit is electrically connected with the auxiliary power supply, the input ends of the inverter and the converter are electrically connected with the connection point of the input unit and the auxiliary power supply, and the output end of the inverter is electrically connected with the input end of the alternating current output unit. The output end of the converter is electrically connected with the input end of the direct current output unit; wherein the signal acquisition unit is used for acquiring a current value and a voltage value of the input unit, and the MCU is used for judging short-circuit and open-circuit faults according to the current value and the voltage value, so that judgment of a single open-circuit point and a plurality of open-circuit and short-circuit points in the whole cable is realized, and fault positions can be positioned.

Description

Technical Field

[0001] This application relates to the field of railway DC remote power supply technology, specifically to a power supply based on a railway DC remote power supply system. Background Technology

[0002] The railway DC remote power supply system is a power supply technology specifically designed to provide stable DC power to low-voltage electrical equipment such as communication, signaling, and monitoring systems along railway lines. With the continuous expansion of the railway network and the improvement of its intelligent capabilities, traditional local power supply or AC power supply methods face problems such as complex wiring, difficult maintenance, and high power loss in remote sections, tunnels, and elevated lines. To address these issues, the DC remote power supply system has emerged. It involves setting up centralized power supply equipment at stations or substations, using one or two pairs of communication cables to transmit high-voltage DC power (such as DC 380V or DC 750V) over long distances to the loads along the line. The voltage is then stepped down to standard DC voltage (such as DC 48V) by a local DC / DC conversion module, thus providing continuous power to various railway low-voltage electrical equipment.

[0003] Currently, most railway DC remote power supply systems use a single-unit mode. According to the requirements of "Railway Intersection Communication Equipment DC Remote Power Supply System" Q / CR809-2020, railway DC remote power supply systems should have the ability to ensure uninterrupted power supply in the event of a single open circuit or short circuit fault; to ensure uninterrupted power supply to all electrical equipment in the system in the event of a single station power outage; and to ensure that a single equipment failure does not affect the normal power supply to other equipment.

[0004] However, the current power supply systems for railway DC remote power supply are relatively outdated in terms of detecting open circuits and short circuits. When a fault occurs, a huge amount of time, manpower, and resources are required to troubleshoot it, which increases the subsequent maintenance costs of the system. In addition, the independent configurations can also affect each other, resulting in a significant decrease in reliability compared to the theoretical level. Summary of the Invention

[0005] Therefore, this application provides a power supply based on a railway DC remote power supply system to solve the problems of poor ability to judge open circuits and short circuits, inability to locate faults, and poor reliability of the power supply in the existing railway DC remote power supply system.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A power supply based on a railway DC remote power supply system includes an input unit, a remote monitoring unit, an inverter, a converter, a DC output unit, and an AC output unit. The remote monitoring unit includes an auxiliary power supply, an MCU, a human-machine interface unit, a signal acquisition unit, and a communication interface. The auxiliary power supply, the human-machine interface unit, the signal acquisition unit, and the communication interface are all electrically connected to the MCU. The input unit is electrically connected to the auxiliary power supply. The input terminal of the inverter is electrically connected to the connection point of the input unit and the auxiliary power supply. The output terminal of the inverter is electrically connected to the input terminal of the AC output unit, which outputs AC power. The input terminal of the converter is electrically connected to the connection point of the input unit and the auxiliary power supply, and the output terminal of the converter is electrically connected to the input terminal of the DC output unit, which outputs DC power. The signal acquisition unit collects the current and voltage values ​​input by the input unit and transmits them to the MCU. The MCU determines short-circuit and open-circuit faults based on the magnitude and direction of the input current and voltage values.

[0008] Preferably, the input unit includes an input adapter board, an input circuit breaker, and an input surge protector. The input terminal of the input adapter board is used to input DC power, and the output terminal of the input adapter board is electrically connected to the auxiliary power supply through the input circuit breaker. The input surge protector is connected in parallel between the input circuit breaker and the auxiliary power supply.

[0009] Preferably, the remote monitoring unit further includes a fault isolation unit, which is electrically connected to the MCU.

[0010] Preferably, the remote monitoring unit further includes an insulation detection unit, which is electrically connected to the MCU.

[0011] Preferably, there are two inverters. The input terminals of the two inverters are connected in parallel and electrically connected to the connection point of the input unit and the auxiliary power supply. The output terminals are electrically connected to the input terminals of the AC output unit.

[0012] Preferably, the AC output unit includes an output adapter board, an output filter, an output circuit breaker, and an output surge protector. The input terminal of the output adapter board is electrically connected to the output terminal of the inverter. The output terminal of the output adapter board is electrically connected to the input terminal of the output circuit breaker through the output filter. The output terminal of the output circuit breaker is used to output AC power. The output surge protector is connected in parallel between the output circuit breaker and the output filter.

[0013] Preferably, the DC output unit employs output filtering.

[0014] Preferably, the signal acquisition unit includes a Hall current sensor and a voltage sensor. The Hall current sensor is used to detect the current value input by the input unit and transmit it to the MCU. The voltage sensor is used to detect the voltage value input by the input unit and transmit it to the MCU. The MCU is used to determine short-circuit faults and open-circuit faults based on the magnitude and direction of the input current and voltage values.

[0015] Compared with the prior art, this application has at least the following beneficial effects:

[0016] Based on further analysis and research of existing technical problems, this application provides a power supply for a railway DC remote power supply system, including an input unit, a remote monitoring unit, an inverter, a converter, a DC output unit, and an AC output unit. The remote monitoring unit includes an auxiliary power supply, an MCU, a human-machine interface unit, a signal acquisition unit, and a communication interface. The auxiliary power supply, human-machine interface unit, signal acquisition unit, and communication interface are all electrically connected to the MCU. The signal acquisition unit collects the current and voltage values ​​input from the input unit and transmits them to the MCU. The MCU uses the magnitude and direction of the input current and voltage values ​​to determine short-circuit and open-circuit faults. This application samples the current and voltage at various input points through the signal acquisition unit and uses the MCU to determine single open-circuit points and multiple open-circuit and short-circuit points throughout the cable, enabling fault location and quickly guiding maintenance personnel to troubleshoot. Furthermore, in the event of an open circuit or short circuit within the central office or remote module, a backup power supply can be switched in promptly without affecting the system's power supply. This breaks the traditional single-unit power supply module mode, achieving uninterrupted power supply during open-circuit faults and improving system reliability. Attached Figure Description

[0017] To more intuitively illustrate the prior art and this application, exemplary drawings are provided below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0018] Figure 1 A basic principle block diagram of a power supply based on a railway DC remote power supply system is provided for this application;

[0019] Figure 2 The circuit block diagram of the embodiment provided in this application.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Input Unit; 101. Input Adapter Board; 102. Input Circuit Breaker; 103. Input Lightning Protection; 2. Remote Monitoring Unit; 201. Auxiliary Power Supply; 202. MCU; 203. Human-Machine Interaction Unit; 204. Signal Acquisition Unit; 205. Communication Interface; 206. Fault Isolation Unit; 207. Insulation Detection Unit; 3. Inverter; 4. Converter; 5. DC Output Unit; 6. AC Output Unit; 601. Output Adapter Board; 602. Output Filter; 603. Output Circuit Breaker; 604. Output Lightning Protection. Detailed Implementation

[0022] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "including," "comprising," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0024] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to indicate the general relative positional relationship for the purpose of intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product.

[0025] Please see Figure 1This application provides a power supply based on a railway DC remote power supply system, applicable to applications such as wireless train dispatching upgrades for conventional railways, high-speed railway security, disaster prevention along railway lines, inter-station signaling equipment, rolling stock equipment, track maintenance equipment, and urban rail transit. This power supply based on the railway DC remote power supply system includes an input unit 1, a remote monitoring unit 2, an inverter 3, a converter 4 (DC / DC converter), a DC output unit 5, and an AC output unit 6. The remote monitoring unit 2 includes an auxiliary power supply 201, an MCU 202, a human-machine interface unit 203, a signal acquisition unit 204, and a communication interface 205. The auxiliary power supply 201, the human-machine interface unit 203, the signal acquisition unit 204, and the communication interface 205 are all electrically connected to the MCU 202. Unit 1 is electrically connected to auxiliary power supply 201. The input terminal of inverter 3 is electrically connected to the connection point of input unit 1 and auxiliary power supply 201. The output terminal of inverter 3 is electrically connected to the input terminal of AC output unit 6. The output terminal of AC output unit 6 is used to output AC power. The input terminal of converter 4 is electrically connected to the connection point of input unit 1 and auxiliary power supply 201. The output terminal of converter 4 is electrically connected to the input terminal of DC output unit 5. The output terminal of DC output unit 5 is used to output DC power. Among them, signal acquisition unit 204 is used to acquire the current value and voltage value input by input unit 1 and transmit them to MCU 202. MCU 202 is used to determine short circuit fault and open circuit fault based on the magnitude and direction of the input current value and voltage value.

[0026] This application provides a power supply for a railway DC remote power supply system. The power supply samples the current and voltage at each input point through the signal acquisition unit 204, and uses the MCU 202 to identify single open circuit points and multiple open circuit / short circuit points in the entire cable. It can also display the fault location, thereby quickly guiding maintenance personnel to troubleshoot the fault. In addition, when there is an open circuit or short circuit inside the module at the central office or remote end, it can be switched to the backup power supply (i.e., auxiliary power supply 201) in time without affecting the power supply of the system. This breaks the traditional single-unit power supply module mode and realizes the ability to maintain power supply during open circuit faults.

[0027] Specifically, in the power supply provided in this application based on a railway DC remote power supply system, the input unit 1 includes an input adapter board 101, an input circuit breaker 102, and an input surge protector 103. The input terminal of the input adapter board 101 is used to input DC power, and the output terminal of the input adapter board 101 is electrically connected to the auxiliary power supply 201 through the input circuit breaker 102. The input surge protector 103 is connected in parallel between the input circuit breaker 102 and the auxiliary power supply 201.

[0028] Specifically, in the power supply based on the railway DC remote power supply system provided in this application, the remote monitoring unit 2 further includes a fault isolation unit 206 and an insulation detection unit 207. The fault isolation unit 206 is electrically connected to the MCU 202, and the insulation detection unit 207 is electrically connected to the MCU 202.

[0029] Specifically, in the power supply provided in this application based on the railway DC remote power supply system, there are two inverters 3. Both inverters 3 are DC / AC inverters. After the two inverters 3 are connected in parallel, their input terminals are electrically connected to the connection point of the input unit 1 and the auxiliary power supply 201, and their output terminals are electrically connected to the input terminal of the AC output unit 6.

[0030] Specifically, in the power supply based on the railway DC remote power supply system provided in this application, the AC output unit 6 includes an output adapter board 601, an output filter 602, an output circuit breaker 603, and an output surge protector 604. The input terminal of the output adapter board 601 is electrically connected to the output terminal of the inverter 3. The output terminal of the output adapter board 601 is electrically connected to the input terminal of the output circuit breaker 603 through the output filter 602. The output terminal of the output circuit breaker 603 is used to output AC power. The output surge protector is connected in parallel between the output circuit breaker 603 and the output filter 602.

[0031] Specifically, in the power supply provided in this application based on a railway DC remote power supply system, the DC output unit 5 adopts an output filter 602.

[0032] Specifically, in the power supply based on the railway DC remote power supply system provided in this application, the signal acquisition unit 204 includes a Hall current sensor and a voltage sensor. The Hall current sensor is used to detect the current value input by the input unit 1 and transmit it to the MCU 202. The voltage sensor is used to detect the voltage value input by the input unit 1 and transmit it to the MCU 202. The MCU 202 is used to determine short circuit faults and open circuit faults based on the magnitude and direction of the input current and voltage values.

[0033] The power supply provided in this application is applicable to the interconnection of one or more railway DC remote power supply devices. When judging open circuit or short circuit of the line, each railway DC remote power supply device monitors all power supply devices connected to it in real time and judges whether each power supply device has a fault. If so, it automatically switches to the backup power supply (i.e., auxiliary power supply 201) and reports the fault information, ensuring uninterrupted power supply to the entire system before the faulty power supply is replaced.

[0034] The MCU202 in this application deploys the operating conditions, reporting content, and IP address of each power supply device in the railway DC remote power supply system when it is operating within the monitoring range. The railway DC remote power supply system has Hall current sensors on both inputs to monitor the magnitude and direction of the input current in real time. Voltage sensors are located at the two voltage inputs to the remote power supply to monitor the input voltage value in real time. The magnitude and direction of the input voltage and current are used to distinguish between short-circuit and open-circuit faults. The remote monitoring unit 1 then controls the power supply to turn on and off. In the event of a fault, the faulty power supply is disconnected, and the backup power supply is connected. The MCU202 reports the fault status, effectively ensuring that the cables and power supply in the railway DC remote power supply system can quickly locate one or more fault points in the event of an open circuit, and quickly switch to the backup power supply, guiding relevant personnel to quickly troubleshoot the fault.

[0035] This application provides a power supply based on a railway DC remote power supply system that can monitor its operating status in real time and report its status at any time. When an open circuit fault occurs between power supply cables, the central office / remote office power supply uses a sampling circuit to determine the corresponding open circuit fault point on the entire line and uploads the alarm information of the open circuit fault cable section to the MCU202. Automatic recovery should occur after the fault is cleared. When an open circuit fault occurs in the central office / remote office power supply module, the data from the voltage / current sampling circuit inside the central office / remote office module is used to determine the specific faulty module, and the MCU202 switches to the backup module. Automatic recovery should occur after the fault is cleared. In addition, each power supply has its own sampling circuit and IP address for short circuit fault identification and judgment, facilitating maintenance.

[0036] Please see Figure 2 The following describes the short-circuit fault and open-circuit fault judgment process provided in this application in conjunction with specific embodiments.

[0037] 1. System Configuration Design:

[0038] 1) Each central office is equipped with two modules with an output power of 2.4kW, for a total output power of 4.8kW;

[0039] 2) Three units are configured remotely: the rated output power of a single unit is 1 + 0.1 = 1.1 kW, the efficiency is 80%, the rated input power is 1.375 kW, and the total input power is 4.125 kW;

[0040] 3) Conclusion: Power matching between the central office and the remote end.

[0041] 2. Bus impedance design:

[0042] 1) In practical engineering application design, considering equipment power redundancy, the load power of remote equipment is 70% of the equipment's rated power;

[0043] 2) In actual engineering application design, at a certain moment, only one remote AC output is overloaded and the maximum overload power is 1.5 times 70% of the rated value;

[0044] 3) Bus impedance design basis: The load of remote equipment #1 and #2 is calculated based on 70% of the rated output power (1.1kW * 70% = 0.77 kW, corresponding input power = 0.77 kW / 0.8 = 0.9625kW).

[0045] 4) The No. 3 remote equipment is located at the end of the busbar. Its AC load is calculated as 1.5 times 70% of the rated AC output power of the equipment (1kW*70%*1.5=1.05kW, corresponding total output power=1.05kW+0.1kW*70%=1.12kW, corresponding total input power=1.12kW / 0.8=1.4kW). In this case, it is necessary to ensure that the input voltage of the No. 3 remote equipment at the end of the busbar is not lower than 470V.

[0046] 5) Calculate based on an impedance of 23Ω for each busbar segment;

[0047] 6) Input current of remote device No. 3 = 1.4kW / 470V = 3A;

[0048] 7) Input voltage at remote end 2 = 470V + 3A * 23Ω = 539V;

[0049] 8) Input current of No. 2 remote bus = 962.5W / 539V+3A = 4.786A;

[0050] 9) Input voltage at remote end 1 = 4.786A * 23Ω + 539V = 649V;

[0051] 10) Input current of No. 1 remote bus = 962.5 W / 649V + 4.786A = 6.27A;

[0052] 11) Initial line voltage drop = 6.27A * 23Ω = 144.2V;

[0053] 12) The power supply voltage of the No. 1 station is 649V + 144.2V = 793.2V.

[0054] Meanwhile, when an open circuit or short circuit occurs within the local / remote module, the MCU202 is used to sample the voltage and current to determine which unit and line segment the open / short circuit fault occurs in. The internal control logic is as follows:

[0055] 1) Enable remote communication function;

[0056] 2) Enable single-point short-circuit detection function for the section lines;

[0057] Note: This is accomplished through multiple dedicated sub-CPUs and the system CPU.

[0058] The criteria for determining a single-point short-circuit fault on the section line are: bus voltage ≤ 320V, hardware high-level activation of the electronic switch, connecting GND1 (floating ground) and PGND (i.e., connecting the resistance sampling circuit) of the short-circuit identification CPU. Simultaneously, the hardware sends high-level signals to all six CPUs (the hardware sending port is floating when there is no short-circuit fault). 0.5ms after receiving the short-circuit signal (signals 1-6), all six CPUs simultaneously start sampling. After 50us of sampling, the CPU that detects a valid short-circuit voltage sampling signal (valid short-circuit voltage refers to the analog voltage sampling signal received by the I / O port within the defined range) shuts off the input electronic switch according to a control strategy that increases the delay by 40us for every 0.1V increase in the valid sampling value (Note: the delay time corresponding to the lowest valid sampling value of the six CPUs is different and is cumulative). During the delay process, the CPU starts sampling confirmation 10us before the delayed shutdown (multiple sampling confirmations to prevent misjudgment), determining whether to finally delay shutdown. The delayed shutdown signal is high-level for 1s. If the confirmation fails, the delayed shutdown will be cancelled.

[0059] Note: If the confirmation fails, it indicates that a device closer to the short circuit point has taken action and disconnected the faulty line. The short circuit detection fault signal of this machine will then be automatically cleared.

[0060] Note: The minimum resolution for voltage drop between equipment is 1.5V, the rated detection range is 0-321V, and the maximum short-circuit interruption delay time is 10ms.

[0061] Within 0.5 seconds of receiving a short-circuit signal from the hardware, the system CPU determines the direction of the short circuit (i.e., the busbar with voltage ≤ 30% of rated voltage), shuts off the corresponding electronic switch on that side, and disables the short-circuit diagnostic function. After 60 seconds, it enters the self-recovery program.

[0062] Self-recovery procedure: The system CPU turns on the previously turned-off electronic switch (the turn-on follows the peak current suppression method, i.e., outputting a 0.1ms / 100kHz / 50% duty cycle turn-on buffer before switching to a 100% duty cycle high-level turn-on state). After 0.1ms, it checks the corresponding external bus voltage. If it is greater than 30% of the rated voltage, the start-up is considered successful (i.e., the self-recovery procedure is completed). Otherwise, the start-up is considered a failure, the electronic switch is turned off, and the start-up is attempted again after a 0.5ms interval. If both start-ups fail, the electronic switch is turned off for 60 seconds before re-entering the self-recovery procedure.

[0063] 3) Enable the single-point open circuit detection function for the section line;

[0064] After the system is running normally, when the current on either busbar drops to within ±0.5A (M1±, M2± ports), the CPU disconnects the corresponding electronic switch (M1 corresponds to electronic switch 1, M2 corresponds to electronic switch 2), delays for 0.4s, and detects the voltage outside the disconnected electronic switch (the voltage outside electronic switch 1 V is input to sensor1, and the voltage outside electronic switch 2 V is input to sensor2). If it is ≤30% of the rated value, it is considered a possible open circuit fault; otherwise, it is considered a false diagnosis, and then the electronic switch is reconnected.

[0065] Note: The above detection, judgment, and electronic switch connection are completed within 0.1s (i.e., each detection lasts 0.5s). Each group of detections consists of 2 consecutive detections (i.e., each group of detections lasts 1s), with an interval of 1.1s between the two groups of detections. The two incoming lines are detected alternately, and an interlocking function is added to prevent the simultaneous disconnection of the two electronic switches.

[0066] If an open circuit fault is detected in two consecutive tests within each group, it is confirmed as a genuine open circuit fault. The corresponding electronic switch remains open, the open circuit fault is reported, and manual recovery is initiated. Note: Once an open circuit fault is detected on one busbar, open circuit detection on the other busbar stops until the aforementioned manual recovery is completed.

[0067] When the internal power supply of the system is open-circuited or short-circuited, the corresponding backup module is activated through internal strategies based on the above theoretical calculations and logic control to ensure uninterrupted power supply to the entire system.

[0068] In this application, when a cable or local / remote module open circuit or short circuit fault occurs, the remote monitoring unit 2 will report the address of the remote device, and the host computer will read the address to determine the specific location, thereby realizing fault location and greatly reducing the fault troubleshooting time.

[0069] This application provides a power supply for a railway DC remote power supply system that can accurately monitor parameters such as input voltage and input current of the power supply, as well as data from various sampling points along the entire power supply cable. This provides precise information for determining open circuits and short circuits in the line and the power supply within the system. Using the method provided in this application to determine open circuits and short circuits in the power supply along the entire DC remote power supply system has the following advantages:

[0070] 1. The open circuit and short circuit fault diagnosis circuit has fewer components, a simpler structure, and higher reliability, which solves the shortcomings of existing cables that cannot promptly identify and troubleshoot open circuit faults.

[0071] 2. In the judgment strategy, by judging the sampling data of each sampling point, the direction of multiple open circuit and short circuit fault points and power open circuit and short circuit fault points in the entire cable can be determined.

[0072] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A power supply based on a railway DC remote power supply system, characterized in that, The system includes an input unit, a remote monitoring unit, an inverter, a converter, a DC output unit, and an AC output unit. The remote monitoring unit includes an auxiliary power supply, an MCU, a human-machine interface unit, a signal acquisition unit, and a communication interface. The auxiliary power supply, the human-machine interface unit, the signal acquisition unit, and the communication interface are all electrically connected to the MCU. The input unit is electrically connected to the auxiliary power supply. The input terminal of the inverter is electrically connected to the connection point of the input unit and the auxiliary power supply. The output terminal of the inverter is electrically connected to the input terminal of the AC output unit, which outputs AC power. The input terminal of the converter is electrically connected to the connection point of the input unit and the auxiliary power supply, and the output terminal of the converter is electrically connected to the input terminal of the DC output unit, which outputs DC power. The signal acquisition unit collects the current and voltage values ​​input by the input unit and transmits them to the MCU. The MCU determines short-circuit and open-circuit faults based on the magnitude and direction of the input current and voltage values.

2. The power supply based on the railway DC remote power supply system according to claim 1, characterized in that, The input unit includes an input adapter board, an input circuit breaker, and an input surge protector. The input terminal of the input adapter board is used to input DC power, and the output terminal of the input adapter board is electrically connected to the auxiliary power supply through the input circuit breaker. The input surge protector is connected in parallel between the input circuit breaker and the auxiliary power supply.

3. The power supply based on the railway DC remote power supply system according to claim 1, characterized in that, The remote monitoring unit also includes a fault isolation unit, which is electrically connected to the MCU.

4. The power supply based on the railway DC remote power supply system according to claim 1, characterized in that, The remote monitoring unit also includes an insulation detection unit, which is electrically connected to the MCU.

5. The power supply based on the railway DC remote power supply system according to claim 1, characterized in that, The inverter is provided in two units. The two inverters are connected in parallel, and their input terminals are electrically connected to the connection point of the input unit and the auxiliary power supply. Their output terminals are electrically connected to the input terminal of the AC output unit.

6. The power supply based on the railway DC remote power supply system according to claim 1, characterized in that, The AC output unit includes an output adapter board, an output filter, an output circuit breaker, and an output surge protector. The input terminal of the output adapter board is electrically connected to the output terminal of the inverter. The output terminal of the output adapter board is electrically connected to the input terminal of the output circuit breaker through the output filter. The output terminal of the output circuit breaker is used to output AC power. The output surge protector is connected in parallel between the output circuit breaker and the output filter.

7. The power supply based on the railway DC remote power supply system according to claim 1, characterized in that, The DC output unit employs output filtering.

8. The power supply based on the railway DC remote power supply system according to claim 1, characterized in that, The signal acquisition unit includes a Hall current sensor and a voltage sensor. The Hall current sensor is used to detect the current value input by the input unit and transmit it to the MCU. The voltage sensor is used to detect the voltage value input by the input unit and transmit it to the MCU. The MCU is used to determine short circuit faults and open circuit faults based on the magnitude and direction of the input current and voltage values.

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