A fault diagnosis system for large-capacity electric boats

Abstract

The present application discloses a fault diagnosis system for large-capacity electric boats, which is suitable for the power system of electric boats. The fault diagnosis system includes: a first fuse, and a fault diagnosis control device; the first fuse is connected in series between the energy storage device and the DC bus, and a first fuse diagnosis device is provided on the first fuse, and the first fuse diagnosis device is used to measure the first resistance value at both ends of the first fuse; the first detection end of the fault diagnosis control device is electrically connected to the first fuse, and the second detection end of the fault diagnosis control device is electrically connected to the first fuse diagnosis device, and the fault diagnosis control device is used to analyze and diagnose the power system according to the on-off state of the first fuse, the first resistance value, and the timestamp when the on-off state of the first fuse changes. Through the technical solution in this application, the timestamp is used to sort out the changes of each device at the moment the fault occurs, so as to analyze the cause of the fault and accurately locate the fault.

Description

Technical Field

[0001] The present application relates to the technical field of fault diagnosis of electric boat power systems, and in particular to a fault diagnosis system for large-capacity electric boats. Background Art

[0002] Ships sailing in fixed navigation areas and fixed voyages on major lakes and inland rivers have all put forward the demand for new energy ships (such as electric ships). Some reservoirs, lakes (Xinjiang Tianchi, Miyun Reservoir, etc.) and some inland river areas (Guangzhou Pearl River section) no longer allow the construction of new ships that use diesel engines as energy. The development of new energy ships is an inevitable trend. New energy ships can effectively reduce ship emissions and effectively improve ship comfort.

[0003] Due to the high power requirements of ships, new energy vessels require large battery capacities to ensure normal operation. For example, the battery capacity of a 300-passenger all-electric passenger ship in Wuhan in 2018 reached 2,300 kWh, and the battery capacity of Yichang Transportation's "Two Dams and One Gorge" cruise ship in 2018 reached 7,500 kWh. These new energy vessels require a wide range of equipment types and quantities, including protection devices, converters, and propulsion systems.

[0004] However, in the existing technology, the fault detection technology for new energy ships faces many problems, especially when a fault occurs inside the electric ship power system (such as a short circuit fault), it is difficult to analyze and judge the status of the electric ship power system, so it is impossible to analyze and diagnose the fault. Therefore, for the fault diagnosis system of large-capacity electric ship power system, it is necessary to more scientifically and effectively analyze the fault of the DC bus system of the electric ship to realize the fault diagnosis of the electric ship power system and provide protection for the future development of new energy ships. Summary of the Invention

[0005] The purpose of this application is to solve the problem of inaccurate fault diagnosis in the power system of electric boats, so as to improve the accuracy of fault location in electric boats.

[0006] The technical solution of the present application is: to provide a fault diagnosis system for large-capacity electric boats, which is suitable for the power system of the electric boat. The power system includes at least an electrically connected energy storage device and a DC bus. The fault diagnosis system includes: a first fuse, and a fault diagnosis control device; the first fuse is connected in series between the energy storage device and the DC bus, and a first fuse diagnosis device is provided on the first fuse, and the first fuse diagnosis device is used to measure the first resistance value at both ends of the first fuse; the first detection end of the fault diagnosis control device is electrically connected to the first fuse, and the second detection end of the fault diagnosis control device is electrically connected to the first fuse diagnosis device, and the fault diagnosis control device is used to perform fault analysis and diagnosis on the power system according to the on-off state of the first fuse, the first resistance value and the timestamp when the on-off state of the first fuse changes.

[0007] In any of the above technical solutions, further, the power system also includes a power supply device, which is electrically connected to the DC bus, and the fault diagnosis system also includes a second fuse; the second fuse is connected in series between the DC bus and the power supply device, and a second fuse diagnostic device is provided on the second fuse, and the second fuse diagnostic device is used to measure the second resistance value at both ends of the second fuse; the third detection end of the fault diagnosis control device is electrically connected to the second fuse, and the fourth detection end of the fault diagnosis control device is electrically connected to the second fuse diagnostic device, and the fault diagnosis control device is used to perform fault analysis and diagnosis on the power system according to the on-off state of the second fuse, the second resistance value and the timestamp when the on-off state of the second fuse changes, wherein the power supply device is a motor.

[0008] In any of the above technical solutions, further, the first fuse diagnostic device and the second fuse diagnostic device are provided with a resistance measurement module, and the resistance measurement module is used to detect the first resistance value of the first fuse.

[0009] In any of the above technical solutions, further, the fault diagnosis system also includes: a first sensor; the first sensor is connected in series between the first fuse and the DC bus, the analog output end of the first sensor is connected to the fifth port of the fault diagnosis control device, and the first sensor is a voltage sensor and / or a current sensor.

[0010] In any of the above technical solutions, further, the fault diagnosis system also includes: a DC conversion device; the DC conversion device is connected in series between the first fuse and the DC bus, and a first switch and a second switch are respectively provided at both ends of the DC conversion device; the sixth port of the fault diagnosis control device is connected to the DC conversion device, and the seventh port of the fault diagnosis control device is respectively connected to the first switch and the second switch, and the fault diagnosis control device is also used to perform fault analysis and diagnosis on the power system based on the fault information of the DC conversion device, the on-off status of the first switch and the second switch, and the corresponding timestamp when the switch is actuated, wherein the fault information of the DC conversion device includes the timestamp when the DC conversion device fails.

[0011] In any of the above technical solutions, the fault diagnosis system further includes: an inverter module; the inverter module is connected in series between the power supply device and the second fuse; the eighth port of the fault diagnosis control device is connected to the inverter module, and the fault diagnosis control device is also used to perform fault analysis and diagnosis on the power system based on the fault information of the inverter module, wherein the fault information of the inverter module includes the timestamp when the inverter module fails.

[0012] In any of the above technical solutions, further, when the power supply device is a transformer, the fault diagnosis system also includes: a filter; the filter is connected in series between the transformer and the converter module, and the signal output end of the filter is connected to the ninth port of the fault diagnosis control device; the fault diagnosis control device is also used to perform fault analysis and diagnosis on the power system based on the fault information of the filter, wherein the fault information of the filter includes the timestamp when the filter fails.

[0013] In any of the above technical solutions, further, the fault diagnosis system also includes: a bus coupling device; the bus coupling device is arranged on the DC bus, and the bus coupling device is used to perform bus coupling protection on the DC bus.

[0014] In any of the above technical solutions, further, the fault diagnosis control device performs fault analysis and diagnosis on the power system, specifically including:

[0015] Step 1: Screening data in a fault analysis library based on received equipment fault information to generate a first fault analysis result, wherein the first fault analysis result includes multiple fault causes and fault phenomena;

[0016] Step 2: Count the frequency of occurrence of the fault cause in the first fault analysis result, and calculate the fault emergency coefficient of the fault cause based on the frequency and the timestamp corresponding to the fault cause;

[0017]

[0018] Where, is the i-th fault cause The corresponding timestamp, is the weight calculation module, is the i-th fault cause Frequency of occurrence, It is a probabilistic identification model;

[0019] Step 3: Sort the fault causes according to the fault emergency coefficient and generate a second fault analysis result. The second fault analysis result is used for fault diagnosis and updating the fault analysis library.

[0020] The beneficial effects of this application are:

[0021] The technical solution in this application, aimed at the power system of the electric boat, adopts a simple topological structure and conventional fault detection and protection elements to realize an accurate and highly reliable fault diagnosis system, and introduces a timestamp when obtaining fault diagnosis information. The timestamp is used to sort out the changes of each device at the moment the fault occurs, so as to analyze the cause of the fault and accurately locate the fault.

[0022] Preferably, in order to improve the accuracy of fuse fault diagnosis, a resistance measurement module is proposed in the process of measuring its resistance value to ensure the accuracy of resistance value measurement and achieve reliable judgment of fuse failure or abnormality.

[0023] In a preferred implementation of the present application, based on a deep learning network, fault information is analyzed in a fault analysis library, and timestamps and the frequency of occurrence of fault causes are introduced. The fault causes are sorted according to their urgency, and fault causes with high urgency are checked first. This helps to speed up the troubleshooting of the electric boat power system, avoid causing more dangerous and serious electric boat failures, optimize fault detection efficiency, and reduce the workload of fault detection personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The advantages of the above and / or additional aspects of the present application will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 is a schematic block diagram of a fault diagnosis system for a large-capacity electric ship according to an embodiment of the present application;

[0026] Figure 2 is a schematic diagram of a fuse diagnostic device according to an embodiment of the present application;

[0027] Figure 3 is a schematic diagram of a fault diagnosis control device according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other in the absence of conflict.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0030] Example 1:

[0031] like Figure 1 As shown, this embodiment provides a fault diagnosis system for large-capacity electric boats. The fault diagnosis system is applicable to the power system of the electric boat. The power system includes at least an electrically connected energy storage device 1 and a DC bus 5. Multiple energy storage devices 1 are arranged in parallel on the DC bus 5. The energy storage device 1 can be a battery, a supercapacitor, a hydrogen fuel cell, etc. Among them, the battery can be a lithium iron phosphate battery, a lithium titanate battery, or a ternary lithium battery. The battery needs to be equipped with a battery management system to monitor the voltage, current, and temperature of the battery.

[0032] In this embodiment, the fault diagnosis system includes: a first fuse 21, and a fault diagnosis control device 12. The first fuse 21 is connected in series between the energy storage device 1 and the DC bus 5 and is used to protect against short circuits on the energy storage device 1 side. A first fuse diagnosis device 131 is provided on the first fuse 21 and is used to measure a first resistance value across the first fuse 21. The first detection terminal of the fault diagnosis control device 12 is electrically connected to the first fuse 21, and the second detection terminal of the fault diagnosis control device 12 is electrically connected to the first fuse diagnosis device 131. The fault diagnosis control device 12 is used to analyze and diagnose power system faults based on the on / off state of the first fuse 21, the first resistance value, and the timestamps of the on / off state transitions of the first fuse 21. The fault diagnosis control device 12 primarily collects the status and timestamps of various devices via a communication bus and digital or analog I / O to diagnose the power system and its devices, and can also provide real-time feedback of the diagnosis results to the monitoring room or supplier.

[0033] It should be noted that the power system also includes a power supply device, which is electrically connected to the DC bus 5, and the fault diagnosis system also includes a second fuse 22; the second fuse 22 is connected in series between the DC bus 5 and the power supply device, and a second fuse diagnostic device 132 is provided on the second fuse 22, and the second fuse diagnostic device 132 is used to measure the second resistance value at both ends of the second fuse 22.

[0034] The third detection end of the fault diagnosis control device 12 is electrically connected to the second fuse 22, and the fourth detection end of the fault diagnosis control device 12 is electrically connected to the second fuse diagnosis device 132. The fault diagnosis control device 12 is used to perform fault analysis and diagnosis on the power system according to the on-off state of the second fuse 22, the second resistance value and the timestamp when the on-off state of the second fuse 22 changes, wherein the power supply device can be the motor 8.

[0035] Furthermore, a resistance measurement module is provided in the first fuse diagnostic device 131 and the second fuse diagnostic device 132, wherein the fuse diagnostic device is mainly used to measure the fuse status before and after a short circuit occurs to determine whether the fuse is blown or to perform fault type diagnosis, such as fuse aging or loose connection.

[0036] Specifically, the first fuse diagnostic device 131 and the second fuse diagnostic device 132 use a resistance measurement module to measure the resistance at both ends of the first fuse 21 and the second fuse 22 respectively. When the fuse fails or is abnormal, such as: blowing, damage, aging or loose connection, the resistance value of the fuse will change relative to the normal situation. At this time, the fuse diagnostic device will send the collected resistance measurement value and the corresponding timestamp to the fault diagnosis control device 12 for analysis and judgment.

[0037] like Figure 2 As shown, this embodiment shows an implementation of a resistance measurement module in a fuse diagnostic device. It should be noted that the first fuse diagnostic device 131 and the second fuse diagnostic device 132 in this embodiment have the same structure.

[0038] The first fuse diagnostic device 131 is now used as an example for description. In this embodiment, the resistance measurement module in the first fuse diagnostic device 131 includes: a potentiometer R1, a transformer T, a first resistor R2, a first capacitor C1, and an operator;

[0039] The primary side of the transformer T is connected in series with a potentiometer R1 and then electrically connected to the DC bus 5. The potentiometer R1 is used to adjust the resistance value in series with the primary side of the transformer T according to a preset cycle. The secondary side of the transformer T is connected in series with a first resistor R2, which is connected in parallel to both ends of the first fuse 21.

[0040] The inverting input terminal of the operator is electrically connected to one end of the fuse through the first capacitor C1, the non-inverting input terminal of the operator is electrically connected to the circuit power supply terminal through the second resistor R3, the non-inverting input terminal of the operator is also electrically connected to the circuit ground terminal through the second capacitor C2 and the third resistor R4 respectively, the output terminal of the operator is electrically connected to the second detection terminal of the fault diagnosis control device 12, and the operator is used to calculate the first resistance value of the first fuse 21.

[0041] Specifically, when the potentiometer R1 adjusts its resistance according to a preset period, the voltage on the primary side of the transformer T changes. At this time, an induced voltage is generated on the secondary side of the transformer T and applied to both ends of the first resistor R2. The induced voltage is a changing voltage.

[0042] It should be noted that the resistance of the first resistor R2 in this embodiment is a fixed value, which can be set according to actual requirements of the circuit without affecting the power supply of the DC bus 5 .

[0043] When an induced voltage is applied to both ends of the first fuse 21 through the first resistor R2, the generated electrical signal is transmitted to the inverting input terminal of the operator through the first capacitor C1 as an input signal. The resistance value of the first fuse 21 can be calculated by utilizing the logical operation capability of the operator, and the calculated resistance value of the first fuse 21 is sent to the second detection terminal of the fault diagnosis control device 12 to realize the detection of the resistance value of the first fuse 21, and then the state of the first fuse 21 is detected according to the resistance value under normal circumstances to determine whether the first fuse 21 has a fault or abnormality.

[0044] It should be noted that the calculation of the resistance value of the first fuse 21 can be logically deduced based on circuit principles, and the specific process will not be repeated here.

[0045] Furthermore, the resistance measurement module further includes a temperature compensation resistor R5 , which is connected in series between the first resistor R2 and the secondary side of the transformer T. The temperature compensation resistor R5 is used to perform temperature compensation on the first fuse 21 .

[0046] It should be noted that this embodiment does not limit the implementation method of the temperature compensation resistor R5.

[0047] Based on the above embodiment, the fault diagnosis system also includes: a first sensor 61; the first sensor 61 is connected in series between the first fuse 21 and the DC bus 5, the analog output end of the first sensor 61 is connected to the fifth port of the fault diagnosis control device 12, and the first sensor 61 is a voltage sensor and / or a current sensor, which is used to monitor the current and voltage of the line before and after the fault occurs.

[0048] In this embodiment, the fault diagnosis system further includes: a DC converter 4; the DC converter 4 is connected in series between the first fuse 21 and the DC bus 5, and a first switch 31 and a second switch 32 are respectively provided at both ends of the DC converter 4; wherein the DC converter 4 is mainly used for the battery system to pump up the voltage of the DC bus 5 and to control the circulation between the multiple energy storage systems 1.

[0049] It should be noted that the purpose of setting the first switch 31 and the second switch 32 in this embodiment is, on the one hand, to facilitate cutting off the connection between the front-end or back-end equipment and the DC bus 5, so as to facilitate personnel to carry out maintenance; on the other hand, it also helps the fault diagnosis control device 12 to analyze and diagnose the power system faults according to the on-off status of the switch and the timestamp when the switch is actuated.

[0050] Therefore, the sixth port of the fault diagnosis control device 12 is connected to the DC conversion device 4, and the seventh port of the fault diagnosis control device 12 is connected to the first switch 31 and the second switch 32 respectively. The fault diagnosis control device 12 is also used to perform fault analysis and diagnosis on the power system based on the fault information of the DC conversion device 4, the on-off status of the first switch 31 and the second switch 32, and the corresponding timestamp when the switch is actuated, wherein the fault information of the DC conversion device 4 includes the timestamp when the DC conversion device 4 fails.

[0051] Correspondingly, the fault diagnosis system also includes: a converter module 7; the converter module 7 is connected in series between the power supply device and the second fuse 22; by setting the converter module 7, it can be used as a motor driver for regulating the speed of the motor 8, and can also be used as an inverter power supply for daily loads, wherein the motor 8 can be either an induction asynchronous motor or a permanent magnet synchronous motor. When the converter module 7 is used as an inverter power supply, a filter device 9 and a transformer 10 need to be configured to ensure the power supply quality of the power supply. The filter device 9 is generally a sine wave filter.

[0052] The eighth port of the fault diagnosis control device 12 is connected to the converter module 7. The fault diagnosis control device 12 is also used to perform fault analysis and diagnosis on the power system based on the fault information of the converter module 7, wherein the fault information of the converter module 7 includes the timestamp when the converter module 7 fails.

[0053] Furthermore, when the power supply device is a transformer 10, the fault diagnosis system also includes: a filter 9; the filter 9 is connected in series between the transformer 10 and the converter module 7, and the signal output end of the filter 9 is connected to the ninth port of the fault diagnosis control device 12; the fault diagnosis control device 12 is also used to perform fault analysis and diagnosis on the power system based on the fault information of the filter 9, wherein the fault information of the filter 9 includes a timestamp when the filter 9 fails.

[0054] Similarly, the fault diagnosis system also includes: a second sensor 62, the second sensor 62 is connected in series between the converter module 7 and the DC bus 5, the analog output end of the second sensor 62 is connected to the tenth port of the fault diagnosis control device 12, the second sensor 62 is a voltage sensor and / or a current sensor, which is used to monitor the current and voltage of the line before and after the fault occurs.

[0055] This embodiment also incorporates a third switch 33 in series between the second fuse 22 and the second sensor 62. When a power system failure or power supply device anomaly occurs, the power supply device can be disconnected by opening the third switch 33. Furthermore, the third switch 33 is electrically connected to the eleventh port of the fault diagnosis and control device 12, enabling the fault diagnosis and control device 12 to analyze and diagnose power system faults based on the switch's on / off state and the timestamp of the switch's actuation.

[0056] Preferably, the fault diagnosis system further includes a bus tie device 11, which is disposed on the DC bus 5 and is used to provide bus tie protection for the DC bus 5. The bus tie device 11 can be a power electronic intelligent bus tie switch or a fuse. If a fuse is used, the fuse should be selected to meet the selectivity requirements for DC bus short circuits.

[0057] Example 2:

[0058] Based on the above embodiment, this embodiment also shows a process in which a fault diagnosis control device 12 performs fault analysis and diagnosis on a power system. In this process, the fault diagnosis control device 12 collects relevant information of fuses, switches, DC conversion devices 4, DC bus 5, sensors, converter modules 7, and fuse diagnostic devices, and diagnoses the fault through the time sequence before and after the fault occurs.

[0059] Specifically, such as Figure 3 As shown, the fault diagnosis control device 12 collects the sensor status of the bus and each branch through the analog input module, where the sensors are mainly voltage sensors and current sensors; the fault diagnosis control device 12 also collects the status of fuses and switches through the switch input module; the fault diagnosis control device 12 also collects fault information of the converter module 7, motor 8, filter device 9, bus coupling device 11, and fuse diagnosis device through the communication module.

[0060] It should be noted that, when the fault diagnosis control device 12 obtains the above information, it can also obtain the timestamp corresponding to the information.

[0061] In this embodiment, all collection states and communication transmissions are managed with timestamps. Before and after a fault occurs, the time of the fault is first confirmed, and then the changes in each device at the moment of the fault are sorted out based on the timestamp. Then, based on the rules before and after the fault or change of each device, fault analysis and diagnosis are performed. That is, based on the jumps of different states combined with timestamps, it is determined which state changes first and which changes later to obtain the final fault diagnosis information.

[0062] For example, if a control system communication failure causes the inverter module 7, which serves as the power supply, to shut down, the voltage on the DC bus 5 may rise, exceeding the limit of the DC converter 4, causing the DC converter 4 to fail. This failure in the DC converter 4 causes the DC bus 5 voltage to drop rapidly, leading to an undervoltage shutdown of the motor driver, the inverter module 7. Therefore, using timestamps, we can analyze the changes in various devices at the moment of the fault, allowing for accurate fault location.

[0063] In this embodiment, the fault diagnosis control device 12 performs fault analysis and diagnosis on the power system based on the received equipment fault information based on a deep learning network, specifically including:

[0064] Step 1: Screening data in a fault analysis library based on received equipment fault information to generate a first fault analysis result, wherein the first fault analysis result includes multiple fault causes and fault phenomena;

[0065] Those skilled in the art will appreciate that the same fault phenomenon may be caused by multiple reasons. For example, the shutdown of the power supply device motor 8 may be due to a fault in the motor 8 itself, a fault in the converter module 7 serving as the motor driver, or a battery failure in the energy storage device 1 that causes a drop in the DC bus 5 voltage. Similarly, a single fault phenomenon may trigger a chain reaction, inducing multiple fault messages.

[0066] In this embodiment, a fault analysis library is established based on historical fault information of the electric boat. The library includes fault phenomena, fault causes, and fault information. By comparing the equipment fault information received by the fault diagnosis control device 12 with the fault analysis library, the corresponding fault cause can be obtained, which can be recorded as a first fault analysis result. However, because the fault causes found are numerous, they cannot be directly used as a basis for fault detection. Therefore, the first fault analysis result needs to be processed to obtain a final fault diagnosis result.

[0067] It should be noted that the equipment fault information in this embodiment includes but is not limited to: the on-off state of the first fuse 21, the first resistance value, the timestamp when the on-off state of the first fuse (21) changes, the on-off state of the second fuse 22, the second resistance value, the timestamp when the on-off state of the second fuse (22) changes, the voltage and / or current of the DC bus 5, the fault information of the DC converter 4, the on-off state of the first switch 31 and the second switch 32 and the timestamp when they are actuated, the fault information of the converter module 7, and the fault information of the filter 9.

[0068] Step 2: Count the frequency of occurrence of the fault cause in the first fault analysis result, and calculate the fault emergency coefficient of the fault cause based on the frequency and the timestamp corresponding to the fault cause;

[0069]

[0070] Where, is the i-th fault cause The corresponding timestamp, Weight calculation module, used to calculate timestamp The weight is in the form of any proportional function, and the sum of the weights is 1. It should be noted that when the electric boat fails, the earlier the timestamp of the fault cause, the greater the corresponding weight.

[0071] is the i-th fault cause Frequency of occurrence, is a probability identification model used to identify the cause of the i-th fault The probability of causing the jth fault phenomenon, j=1,2,…n.

[0072] Step 3: Sort the fault causes according to the fault emergency coefficient and generate a second fault analysis result. The second fault analysis result is used for fault diagnosis and updating the fault analysis library.

[0073] Specifically, through the above calculation process, the fault emergency coefficient corresponding to the possible fault cause is calculated, and the urgent fault cause is first checked to avoid causing more dangerous and serious electric boat failures, which helps to improve the safety and reliability of the electric boat and optimize the fault detection efficiency.

[0074] In this embodiment, an exclusion threshold may be set to exclude fault causes whose fault urgency coefficient is less than the exclusion threshold, thereby reducing the workload of operators in fault detection.

[0075] The above describes the technical solution of the present application in detail in conjunction with the accompanying drawings. The present application proposes a fault diagnosis system for large-capacity electric boats, which is suitable for the power system of electric boats. The fault diagnosis system includes: a first fuse, and a fault diagnosis control device; the first fuse is connected in series between the energy storage device and the DC bus, and a first fuse diagnosis device is provided on the first fuse, and the first fuse diagnosis device is used to measure the first resistance value at both ends of the first fuse; the first detection end of the fault diagnosis control device is electrically connected to the first fuse, and the second detection end of the fault diagnosis control device is electrically connected to the first fuse diagnosis device, and the fault diagnosis control device is used to analyze and diagnose the power system according to the on-off state of the first fuse, the first resistance value, and the timestamp when the on-off state of the first fuse changes. Through the technical solution in this application, the timestamp is used to sort out the changes of each device at the moment the fault occurs, so as to analyze the cause of the fault and accurately locate the fault.

[0076] The steps in this application can be adjusted in order, combined, and deleted according to actual needs.

[0077] The units in the device of the present application can be combined, divided and deleted according to actual needs.

[0078] Although the present application is disclosed in detail with reference to the accompanying drawings, it should be understood that these descriptions are merely exemplary and are not intended to limit the application of the present application. The scope of protection of the present application is defined by the appended claims and may include various modifications, alterations and equivalents made to the invention without departing from the scope and spirit of the present application.

Claims

1. A fault diagnosis system for large-capacity electric boats, characterized in that: The fault diagnosis system is applicable to a power system of an electric boat, wherein the power system comprises at least an electrically connected energy storage device (1) and a DC bus (5), and the fault diagnosis system comprises: a first fuse (21), and a fault diagnosis control device (12); The first fuse (21) is connected in series between the energy storage device (1) and the DC bus (5), and a first fuse diagnostic device (131) is provided on the first fuse (21), and the first fuse diagnostic device (131) is used to measure a first resistance value at both ends of the first fuse (21); The first detection end of the fault diagnosis control device (12) is electrically connected to the first fuse (21), and the second detection end of the fault diagnosis control device (12) is electrically connected to the first fuse diagnosis device (131). The fault diagnosis control device (12) is used to perform fault analysis and diagnosis on the power system according to the on-off state of the first fuse (21), the first resistance value, and the timestamp when the on-off state of the first fuse (21) changes; The fault diagnosis control device (12) performs fault analysis and diagnosis on the power system, specifically including: Step 1: Screening data in a fault analysis library based on received equipment fault information to generate a first fault analysis result, wherein the first fault analysis result includes multiple fault causes and fault phenomena; Step 2: Count the frequency of occurrence of the fault cause in the first fault analysis result, and calculate the fault emergency coefficient of the fault cause based on the frequency and the timestamp corresponding to the fault cause; ； Where, is the i-th fault cause The corresponding timestamp, is the weight calculation module, is the i-th fault cause Frequency of occurrence, It is a probabilistic identification model; Step 3: Sort the fault causes according to the fault emergency coefficient and generate a second fault analysis result. The second fault analysis result is used for fault diagnosis and updating the fault analysis library.

2. The fault diagnosis system for a large-capacity electric boat according to claim 1, characterized in that: The power system further includes a power supply device electrically connected to the DC bus (5), and the fault diagnosis system further includes a second fuse (22); The second fuse (22) is connected in series between the DC bus (5) and the power supply device, and a second fuse diagnostic device (132) is provided on the second fuse (22), and the second fuse diagnostic device (132) is used to measure a second resistance value at both ends of the second fuse (22); The third detection terminal of the fault diagnosis control device (12) is electrically connected to the second fuse (22), and the fourth detection terminal of the fault diagnosis control device (12) is electrically connected to the second fuse diagnosis device (132). The fault diagnosis control device (12) is used to perform fault analysis and diagnosis on the power system according to the on-off state of the second fuse (22), the second resistance value, and the timestamp when the on-off state of the second fuse (22) changes. Wherein, the power supply device is a motor (8).

3. The fault diagnosis system for a large-capacity electric boat according to claim 2, characterized in that: The first fuse diagnostic device (131) and the second fuse diagnostic device (132) are provided with a resistance measurement module, and the resistance measurement module is used to detect the first resistance value of the first fuse (21).

4. The fault diagnosis system for a large-capacity electric boat according to claim 1, characterized in that: The fault diagnosis system further includes: a first sensor (61); The first sensor (61) is connected in series between the first fuse (21) and the DC bus (5), an analog output end of the first sensor (61) is connected to a fifth port of the fault diagnosis control device (12), and the first sensor (61) is a voltage sensor and / or a current sensor.

5. The fault diagnosis system for a large-capacity electric boat according to claim 1, characterized in that: The fault diagnosis system further comprises: a DC conversion device (4); The DC conversion device (4) is connected in series between the first fuse (21) and the DC bus (5), and a first switch (31) and a second switch (32) are respectively provided at both ends of the DC conversion device (4); The sixth port of the fault diagnosis control device (12) is connected to the DC conversion device (4), and the seventh port of the fault diagnosis control device (12) is connected to the first switch (31) and the second switch (32), respectively. The fault diagnosis control device (12) is further used to perform fault analysis and diagnosis on the power system based on the fault information of the DC conversion device (4), the on-off state of the first switch (31) and the second switch (32), and the timestamp corresponding to the switch action, wherein the fault information of the DC conversion device (4) includes the timestamp when the DC conversion device (4) fails.

6. The fault diagnosis system for a large-capacity electric boat according to claim 2, characterized in that: The fault diagnosis system further comprises: a converter module (7); The converter module (7) is connected in series between the power supply device and the second fuse (22); The eighth port of the fault diagnosis control device (12) is connected to the converter module (7), and the fault diagnosis control device (12) is further used to perform fault analysis and diagnosis on the power system based on fault information of the converter module (7), wherein the fault information of the converter module (7) includes a timestamp when the converter module (7) fails.

7. The fault diagnosis system for a large-capacity electric boat according to claim 6, characterized in that: When the power supply device is a transformer (10), the fault diagnosis system further comprises: a filter (9); The filter (9) is connected in series between the transformer (10) and the converter module (7), and the signal output end of the filter (9) is connected to the ninth port of the fault diagnosis control device (12); The fault diagnosis control device (12) is further used to perform fault analysis and diagnosis on the power system based on the fault information of the filter (9), wherein the fault information of the filter (9) includes a timestamp when the filter (9) fails.

8. The fault diagnosis system for a large-capacity electric boat according to claim 1, characterized in that: The fault diagnosis system further includes: a busbar coupling device (11); The bus coupling device (11) is arranged on the DC bus (5), and the bus coupling device (11) is used to perform bus coupling protection on the DC bus (5).

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