Auxiliary power supply system, auxiliary power supply control method

Abstract

The present disclosure relates to the technical field of power supply control, in particular to an auxiliary power supply system and an auxiliary power supply control method. The system comprises: a frequency converter connected with a corresponding load; the number of the frequency converters corresponds to the number of the loads; a redundant frequency converter used for supplying power to the load corresponding to a target frequency converter; an auxiliary control unit connected with each frequency converter and the redundant frequency converter for controlling the redundant frequency converter or other frequency converters to supply power to the load corresponding to the target frequency converter. The present scheme realizes efficient use of energy and effective energy saving. When monitoring that any frequency converter in the system fails, the auxiliary redundant frequency converter can be called to supply power to the load corresponding to the target frequency converter, or when the redundant frequency converter fails, other frequency converters can be called to supply power to the load corresponding to the target frequency converter, thereby improving the reliability of the system.

Description

Technical Field

[0001] This disclosure relates to the field of power supply control technology, specifically to an auxiliary power supply system and an auxiliary power supply control method. Background Technology

[0002] The main circuit of high-power hydrogen fuel cell locomotives uses a DC-AC method to drive the traction motor. Currently, the auxiliary circuit structure used in high-power hydrogen fuel cell locomotives draws power from the DC circuit in the middle of the main circuit. VVVF (Variable Voltage Variable Frequency) auxiliary inverter modules and CVCF (Constant Voltage Continuous Frequency) auxiliary inverter modules provide 3AC 380V power to various auxiliary loads on the locomotive. The VVVF loads are controlled by the same VVVF auxiliary inverter module. The auxiliary control unit adjusts the operating state of the auxiliary loads according to the locomotive's operating conditions. Changes in the output of the VVVF auxiliary inverter module will cause all VVVF loads to change accordingly, making independent control of the auxiliary loads impossible. For example, high-power hydrogen fuel cell locomotives have two types of VVVF loads: traction fans and converter cabinet fans. When the converter cabinet fan needs to increase its frequency to increase heat dissipation, even if the traction motor temperature is not high, the frequency of the traction fan must also be increased, resulting in a waste of energy from the battery and hydrogen fuel cell.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] This disclosure provides an auxiliary power supply system and an auxiliary power supply control method, which effectively overcome the defects existing in the prior art.

[0005] Other features and advantages of this disclosure will become apparent from the following detailed description, or may be learned in part from practice of this disclosure.

[0006] According to one aspect of this disclosure, an auxiliary power supply system is provided, comprising:

[0007] A frequency converter is connected to a corresponding load; the number of frequency converters corresponds to the number of loads.

[0008] Redundant frequency converters are used to supply power to the load corresponding to the target frequency converter;

[0009] The auxiliary control unit is connected to each frequency converter and redundant frequency converter and is used to control the redundant frequency converter or other frequency converters to supply power to the load corresponding to the target frequency converter.

[0010] In some exemplary embodiments, the system further includes:

[0011] The grounding detection circuit is connected to the DC input terminal and is used to detect the grounding position of the target frequency converter.

[0012] In some exemplary embodiments, the system further includes:

[0013] The redundant frequency converter is equipped with redundant contactors between each load.

[0014] In some exemplary embodiments, voltage sensors and current sensors are respectively provided on the input side and the output side of the frequency converter; each sensor is connected to the auxiliary control unit.

[0015] In some exemplary embodiments, the auxiliary control unit includes: a central controller, and a plurality of inverter controllers corresponding to the inverter and the redundant inverter;

[0016] The frequency converter controller is connected to the central controller and is used to monitor the operating parameters of the corresponding frequency converter / redundant frequency converter.

[0017] In some exemplary embodiments, the load includes individual devices, as well as load combinations consisting of multiple devices of the same type.

[0018] According to one aspect of this disclosure, an auxiliary power supply control method is provided, applied to an auxiliary power supply system as described in the exemplary embodiments above, the method comprising:

[0019] Collect the operating parameters of the frequency converter;

[0020] When the auxiliary control unit determines that a target frequency converter exists based on the operating parameters of the frequency converter, it controls the redundant frequency converter to supply power to the load corresponding to the target frequency converter.

[0021] In some exemplary embodiments, the method further includes:

[0022] When the auxiliary control unit determines that a target inverter exists based on the inverter's operating parameters, if the redundant inverter fails, it will call the inverter with the lowest load power to supply power to the load corresponding to the target inverter.

[0023] In some exemplary embodiments, the method further includes:

[0024] The grounding location of the target frequency converter is determined based on the voltage value detected by the grounding detection circuit.

[0025] According to one aspect of this disclosure, a storage medium is provided having a computer program stored thereon, which, when executed by a processor, represents the aforementioned auxiliary power supply control method.

[0026] One embodiment of the auxiliary power supply control system and method disclosed herein enables each load to be independently controlled by frequency converters according to operational requirements, achieving efficient energy utilization and effective energy saving. Furthermore, by setting redundant frequency converters and auxiliary control units in the system, the auxiliary control unit can call upon the auxiliary redundant frequency converter to supply power to the load corresponding to the target frequency converter when any frequency converter in the system detects a fault, or call upon other frequency converters to supply power to the load corresponding to the target frequency converter when a redundant frequency converter fails, thereby improving system reliability.

[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0029] Figure 1 This schematic diagram illustrates the composition of an auxiliary power supply system according to an exemplary embodiment of the present disclosure;

[0030] Figure 2 This schematic diagram illustrates the composition of an auxiliary control unit according to an exemplary embodiment of the present disclosure;

[0031] Figure 3 The schematic diagram illustrates an auxiliary power supply control method according to an exemplary embodiment of the present disclosure;

[0032] Figure 4 The illustration shows a schematic diagram of an auxiliary power supply control method according to an exemplary embodiment of the present disclosure;

[0033] Figure 5 A schematic diagram of a storage medium according to an embodiment of the present disclosure is shown. Detailed Implementation

[0034] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0035] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0036] To address the shortcomings and deficiencies of existing technologies, this exemplary embodiment provides an auxiliary power supply system. The aim is to offer a highly reliable and energy-efficient auxiliary power supply system applicable to the auxiliary circuits of high-power hydrogen fuel cell locomotives. (Reference) Figure 1 As shown, the components include: DC power supply 101; auxiliary control unit 102; grounding detection circuit 103; frequency converter 104; load 105; redundant contactor 106; and redundant frequency converter 107.

[0037] The auxiliary power supply system includes: multiple loads 105 (auxiliary load 1, auxiliary load 2, ..., auxiliary load N), multiple frequency converters 104 (frequency converter 1, frequency converter 2, ..., frequency converter N), an auxiliary control unit 102, a grounding detection circuit 103, and a redundant frequency converter 107. The auxiliary control unit 102 is used to control the redundant frequency converter or other frequency converters to supply power to the load corresponding to the target frequency converter.

[0038] In this example embodiment, the input terminal of the system DC power supply 101 is connected to the input terminals of each frequency converter 104 and the redundant frequency converter 107, respectively, to supply power to each frequency converter 104 and the redundant frequency converter 107. For example, this auxiliary power supply system provides DC input power and outputs 3AC 380V power through the frequency converter to control the operation of each auxiliary load.

[0039] The auxiliary control unit 102 is connected to each frequency converter 104 and the redundant frequency converter 107 respectively, and is used to send control signals to each frequency converter 104 and the redundant frequency converter 107. Each frequency converter 104 is set to correspond to one load 105; that is, the frequency converter corresponding to each auxiliary load is independently controlled.

[0040] In this example embodiment, the output terminal of the redundant frequency converter 107 is connected to the output terminal of each frequency converter 104 and each load 105, respectively. A redundant contactor 106 (KM1, KM2, ... KMN) is also provided between the output terminal of the redundant frequency converter 107 and each load 105.

[0041] In this example embodiment, a grounding detection circuit 103 is also connected to the input terminal of the DC power supply 101 to detect the grounding position of the target frequency converter. The grounding detection circuit 103 may include a voltage sensor and two resistors; one end of the voltage sensor is grounded, and the other end is connected to the input terminal of each frequency converter. The target frequency converter is one that has malfunctioned and cannot operate normally.

[0042] Specifically, the grounding detection circuit can quickly and accurately determine the grounding location, providing assistance for locomotive maintenance after it enters the depot. For example, when the locomotive is running normally, the system input voltage is U, and the voltage detected by the voltage sensor in the grounding detection circuit is U / 2. When the voltage sensor detects a voltage of U, it proves that the positive terminal of the inverter input circuit is grounded; when the voltage sensor detects a voltage of 0, it proves that the negative terminal of the inverter input circuit is grounded; when a specific pulse voltage is detected, it proves that the inverter output circuit is grounded.

[0043] In this example implementation, the load includes individual devices and load combinations consisting of multiple devices of the same type.

[0044] Specifically, the aforementioned load 105 can be categorized based on power output and equipment type. For auxiliary loads with power outputs exceeding a preset threshold, each auxiliary load can be configured with an independent frequency converter. For auxiliary loads with power outputs below the preset threshold and of the same equipment type, multiple auxiliary loads can be grouped together, and one frequency converter can be configured for each group of auxiliary loads.

[0045] For example, locomotive auxiliary loads include compressors, traction fans, air conditioners, and anti-freezing heaters. Load power ranges from 64W to 27kW. Auxiliary loads with power greater than 15kW can be controlled by independent frequency converters; for example, larger power fans and compressors can be grouped together, each controlled by a separate frequency converter. Alternatively, loads with power less than 15kW can be grouped together, with each group having a total power less than 25kW, and each group controlled by an independent frequency converter. Because individual devices of this type have relatively low power, it's not suitable to configure a frequency converter for each device. Therefore, multiple similar loads can be grouped together, with each group controlled by an independent frequency converter, avoiding waste caused by setting up too many frequency converters. For example, resistive loads with power less than 15kW can be grouped into one category, and fan loads into another.

[0046] By classifying loads according to type and power and configuring corresponding frequency converters, the auxiliary control unit can adjust the corresponding auxiliary loads individually according to actual needs to meet the locomotive's operation. Some loads that do not require frequency changes can still maintain their original frequency, reducing unnecessary power consumption and thus improving energy efficiency, thereby achieving the goal of locomotive energy saving.

[0047] In this example embodiment, voltage sensors and current sensors can be respectively installed on the input side and output side of each inverter 104 and redundant inverter 107; each sensor is connected to the auxiliary control unit.

[0048] For example, voltage and current sensors installed on the input and output sides of frequency converters and redundant frequency converters can be used to detect changes in the input and output voltage and current of the frequency converters and redundant frequency converters. During normal operation of the locomotive, the auxiliary control unit monitors the operating status of each frequency converter and redundant frequency converter in real time through the voltage and current signals detected by each sensor, and uses this information for fault diagnosis; for example, overvoltage in the intermediate circuit, overcurrent in the intermediate circuit, overvoltage in the output circuit, overcurrent in the output circuit, and overload in the output circuit.

[0049] In this example implementation, refer to Figure 2 As shown, the auxiliary control unit includes: a central controller 21, and several inverter controllers 22 (inverter controller 1, inverter controller 2, ... inverter controller M) corresponding to each inverter and redundant inverter; each inverter controller 22 is connected to the central controller 21 to monitor the operating parameters of the corresponding inverter and redundant inverter. Voltage sensors 23 and current sensors 24 are installed on the input and output sides of each inverter 104 and redundant inverter 107, which can be connected to the corresponding inverter controller; the collected current and voltage signals are sent to the corresponding inverter controller.

[0050] Specifically, under normal locomotive operating conditions, each inverter controller monitors its own inverter's output voltage, current, and frequency in real time and transmits this operating status data to the CPU motherboard, i.e., the central controller. The CPU motherboard then performs data processing, status monitoring, and fault diagnosis. Furthermore, the power of redundant inverters can be set to twice the power of the other inverter with the highest load, preventing situations where more than one inverter fails. When an inverter fails, the CPU detects the abnormal data, diagnoses the fault, and shuts down the target inverter. The redundant inverter, or another inverter, then supplies power to the faulty load, greatly improving system reliability.

[0051] For example, if inverter 1 fails, the system blocks inverter 1. If the redundant inverter is idle or occupied, the redundant contactor KM1 is closed, and the redundant inverter supplies power to load 1. Alternatively, if the current redundant inverter fails, the system selects the inverter with the lowest current load power to supply power. For example, assuming inverter 2 has the lowest load power, redundant contactors KM1 and KM2 are closed, and inverter 2 supplies power to load 1.

[0052] This example embodiment provides an auxiliary power supply control method, which can be applied to the aforementioned auxiliary power supply system. (See reference...) Figure 3 As shown, the auxiliary power supply control method includes:

[0053] Step S31: Collect the operating parameters of the frequency converter;

[0054] In step S32, when the auxiliary control unit determines that a target frequency converter exists based on the operating parameters of the frequency converter, it controls the redundant frequency converter to supply power to the load corresponding to the target frequency converter.

[0055] Specifically, the aforementioned auxiliary power supply control method can be executed by the auxiliary control unit in the aforementioned auxiliary power supply system, in conjunction with other sensors and frequency converters.

[0056] Specifically, the operating parameters of the frequency converter can include current signals, voltage signals, and frequency signals collected by current sensors and voltage sensors installed on the input and output sides of the frequency converter and redundant frequency converter. Each frequency converter controller in the auxiliary control unit monitors the output voltage, current, and frequency of its corresponding frequency converter and redundant frequency converter, and transmits this operating status data to the central controller. The central controller performs data calculations, status monitoring, and fault diagnosis based on the operating parameters uploaded by each frequency converter. When the auxiliary control unit detects a frequency converter fault, it can designate the faulty frequency converter as the target frequency converter and lock it; it also determines the operating status of the redundant frequency converter. If the redundant frequency converter is currently idle, or occupied but only by another target frequency converter, it controls the redundant contactor between the redundant frequency converter and the current target frequency converter to close; and controls the redundant frequency converter to supply power to the load corresponding to the target frequency converter.

[0057] In this example implementation, refer to Figure 4 As shown, the method further includes:

[0058] In step S33, when the auxiliary control unit determines that a target inverter exists based on the inverter's operating parameters, if the redundant inverter fails, it calls the inverter with the lowest load power to supply power to the load corresponding to the target inverter.

[0059] Specifically, when the target inverter is detected, if the current redundant inverter is found to be faulty, or if the redundant inverter is currently occupied by multiple other target inverters and the current power is close to the maximum power, then the power of the other normal inverters can be read, and the inverter with the lowest load power can be selected to supply power to the target inverter.

[0060] In this example embodiment, the method further includes: determining the grounding location of the target frequency converter based on the voltage value detected by the grounding detection circuit.

[0061] Specifically, the grounding detection circuit can quickly and accurately determine the grounding location, providing assistance for locomotive maintenance after it enters the depot. For example, when the locomotive is running normally, the system input voltage is U, and the voltage detected by the voltage sensor in the grounding detection circuit is U / 2. When the voltage sensor detects a voltage of U, it proves that the positive terminal of the inverter input circuit is grounded; when the voltage sensor detects a voltage of 0, it proves that the negative terminal of the inverter input circuit is grounded; when a specific pulse voltage is detected, it proves that the inverter output circuit is grounded.

[0062] In this example implementation, refer to Figure 5 As shown, a program product 50 for implementing the above-described method according to an embodiment of the present invention is described. It may employ a portable compact disc read-only memory (CD-ROM) and include program code, and may run on a device such as a personal computer. However, the program product of the present invention is not limited thereto. In this document, the readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0063] The program product may employ any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0064] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium, capable of sending, propagating, or transmitting programs for use by or in conjunction with an instruction execution system, apparatus, or device.

[0065] The program code contained on the readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0066] Program code for performing the operations of this invention can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0067] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to embodiments of this disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0068] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0069] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An auxiliary power supply system for use in high-power hydrogen fuel cell locomotives, characterized in that, include: Multiple frequency converters are connected to corresponding loads; the number of frequency converters corresponds to the number of loads; wherein, for auxiliary loads with power greater than a first threshold, an independent frequency converter is configured for each auxiliary load; for auxiliary loads with power less than the first threshold and of the same type, multiple auxiliary loads are configured into a group, and a frequency converter is configured for this group of auxiliary loads. Redundant frequency converters are used to supply power to the load corresponding to the target frequency converter; The auxiliary control unit is connected to each frequency converter and the redundant frequency converter for controlling the redundant frequency converter or other frequency converters to supply power to the load corresponding to the target frequency converter. Specifically, when a fault is detected in the target frequency converter, the redundant frequency converter is controlled to supply power to the load or load combination corresponding to the target frequency converter. When the redundant frequency converter is unavailable, the other normal frequency converter with the lowest current load power is controlled to supply power to the load or load combination corresponding to the target frequency converter.

2. The auxiliary power supply system according to claim 1, characterized in that, The system also includes: The grounding detection circuit is connected to the DC input terminal and is used to detect the grounding position of the target frequency converter.

3. The auxiliary power supply system according to claim 1, characterized in that, The system also includes: The redundant frequency converter is equipped with redundant contactors between each load.

4. The auxiliary power supply system according to claim 1, characterized in that, The inverter is equipped with a voltage sensor and a current sensor on its input and output sides, respectively; each sensor is connected to the auxiliary control unit.

5. The auxiliary power supply system according to claim 1, characterized in that, The auxiliary control unit includes: a central controller, and several frequency converter controllers corresponding to the frequency converter and the redundant frequency converter; The frequency converter controller is connected to the central controller and is used to monitor the operating parameters of the corresponding frequency converter or redundant frequency converter.

6. The auxiliary power supply system according to claim 1, characterized in that, The load includes individual devices, as well as load combinations consisting of multiple devices of the same type.

7. An auxiliary power supply control method, applied to the auxiliary power supply system as described in any one of claims 1-6, characterized in that, The method includes: Collect the operating parameters of the frequency converter; When the auxiliary control unit determines that a target frequency converter exists based on the operating parameters of the frequency converter, it controls the redundant frequency converter to supply power to the load corresponding to the target frequency converter.

8. The auxiliary power supply control method according to claim 7, characterized in that, The method further includes: When the auxiliary control unit determines that a target inverter exists based on the inverter's operating parameters, if the redundant inverter fails, it will call the inverter with the lowest load power to supply power to the load corresponding to the target inverter.

9. The auxiliary power supply control method according to claim 7, characterized in that, The method further includes: The grounding location of the target frequency converter is determined based on the voltage value detected by the grounding detection circuit.

10. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the auxiliary power supply control method according to any one of claims 7 to 9.

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