Electric ship power rack system and test method

Abstract

The invention provides an electric ship power rack system and a test method. The electric ship power rack system comprises a power supply system, and an EMS system, a simulation load, an electric pushing system, a cooling system, a combiner box and a communication network which need to be tested by a ship. The power supply system is a plurality of battery packs of the tested ship or a battery simulator, and the battery simulator simulates the power supply process of the battery packs; the communication network provides data transmission for the power supply system, the EMS system, the electric pushing system, the cooling system, the combiner box and the main control system; the EMS system is used for carrying out electric energy distribution and monitoring the state of an electricity load and a power supply system in real time. The system solves the problem that the ship debugging environment is severe, and the ship manufacturing period can be effectively shortened.

Description

Technical Field

[0001] The present application relates to the field of shipbuilding technology, and in particular to an electric ship power test bench system and a testing method. Background Art

[0002] Nowadays, new energy ships are being promoted at an accelerated pace. For large pure electric ships, improving the stability, efficiency and safety of electronic appliances is one of the purposes of ship testing.

[0003] The existing test bench system for new energy vehicles is relatively mature. It simulates the key systems and components of new energy vehicles for experiments, fault diagnosis and performance evaluation. Such test benches usually include battery management system (BMS), motor drive system, charging system, energy management system and other parts, which can help users gain a deeper understanding of the working principle and technical details of new energy vehicles.

[0004] In the existing technology, the testing of ships is still done on-site on board. However, the working conditions of ships are relatively complex, and strict requirements are imposed on protection and safety. In particular, the ship commissioning environment is harsh. Testing directly on board not only poses a safety hazard, but also because of the large space of large ships, the distance between various systems is far, which is not conducive to communication between testers. In addition, the various systems are distributed in various compartments of the ship, making joint commissioning difficult. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide an electric ship power test bench system and method to solve the above-mentioned problems existing in the prior art, shorten the ship testing cycle, and improve the testing safety.

[0006] In a first aspect, the present invention provides an electric ship power test bench system, including a power supply system and an EMS system required for ship testing, a simulated load, an electric propulsion system, a cooling system, a junction box, and a communication network;

[0007] The power supply system is a plurality of battery packs of the tested ship or a battery simulator, and the battery simulator simulates the power supply process of the battery pack;

[0008] The communication network provides data transmission for the power supply system, EMS system, electric propulsion system, cooling system, junction box and main control system; the EMS system is used for power distribution, real-time monitoring of power load and power system status; the electric propulsion system includes a motor to be tested, a motor MCU and a propulsion control module. The propulsion control module sends a ship navigation command to the EMS system, and the EMS system converts it into a speed or torque signal to the motor MCU, and the motor MCU controls the rotation of the motor; the junction box conducts convergence of the power system, a circuit breaker is set on the connection line between the battery pack and the junction box, and the motor is connected to the junction box; the cooling system cools the electric propulsion system; the simulated load is connected to the motor to be tested of the electric propulsion system, and the simulated load is used to simulate the load of the propeller on the motor during the navigation of the ship; the EMS system issues a motor speed, power or torque parameter instruction according to the request of the electric propulsion system, and then determines whether the parameters displayed by the motor MCU are consistent with the parameters issued by the EMS, adjusts the load of the motor by adjusting the simulated load, and records the state parameters of the motor under different loads to test and evaluate the motor performance; the EMS system issues a power-on instruction to the corresponding power load, and determines whether the communication network transmits data according to the response status of the power load.

[0009] In an optional embodiment, a BMS system is also included for managing the battery status. The power system consists of two battery packs. The EMS system adjusts the power supply status of the battery pack. The BMS system is used to monitor the operating parameters of the battery pack when it is powered independently and in parallel under different working conditions of the motor.

[0010] In an optional embodiment, a motor test bench is further included, which includes a base and a motor base, a coupling, a transmission shaft, a torque sensor, a simulated load and an auxiliary support device located on the base, a motor mounting frame is provided on the motor base for mounting the motor to be tested, the simulated load is a motor, the coupling and the transmission shaft are used to connect the motor to be tested and the simulated load, the torque sensor is used to detect the torque of the motor to be tested, and the auxiliary support device is used to support the transmission shaft.

[0011] In an optional embodiment, a protective cover and an air spring are also included. The air spring is located under the base to reduce the vibration of the base, and the protective cover is used to protect the coupling and the transmission shaft.

[0012] In an optional embodiment, a daily AC power distribution system is also included, which includes a distribution board and an inverter. The inverter is connected to the battery pack through a combiner box, and the distribution board is used to control the working state of the inverter.

[0013] In a second aspect, the present invention provides a method for testing an electric ship power bench system, using an electric ship power bench system as described in any of the above embodiments, comprising:

[0014] After EMS sends a low-voltage power-on command to the BMS system and the motor MCU, it tests whether the BMS system and the motor MCU wake up for self-test and whether they send feedback signals to the BMS after waking up for self-test;

[0015] After the BMS system issues a high-voltage power-on command, determine whether the circuit breaker between the battery pack and the combiner box is closed in sequence, and determine whether the BMS system feeds back a response signal;

[0016] Determine whether the BMS system, motor MCU and communication network are abnormal based on the feedback signals from the BMS system and motor MCU.

[0017] In an optional embodiment, the battery pack is connected to a daily AC power distribution system, the inverter is started through the distribution board, and the simulated load is adjusted so that the motor load reaches 25%, 50%, 75%, 100%, and 110% of the rated power. The voltage, current, power, temperature of the battery pack and the current difference between the battery packs are tested when the motor is powered independently and in parallel under the set load to evaluate the performance of the battery pack; the inverter output voltage, current, frequency, power, component temperature and voltage harmonics are recorded to evaluate the inverter performance.

[0018] In an optional implementation, after the inverter is started, it is gradually loaded to the rated load and runs stably for 1 to 5 minutes, the load is reduced to 0, and the change and stabilization time of the inverter output voltage are recorded. Then, the load is increased from 0-50%-100% and run for 1 to 5 minutes respectively, and the change and stabilization time of the inverter output voltage are recorded.

[0019] In an optional embodiment, a backup simulation control system is also included for controlling the motor to be tested and the cooling system. When the control program of the motor to be tested and the cooling system is missing, control instructions are manually sent to the test motor and the cooling system through the backup simulation control system to complete the test of the test motor and the cooling system.

[0020] In an optional embodiment, a motor power limiting module is also included. When there is a battery pack failure, the motor power limiting module limits the power of the motor to be tested to avoid overload causing power outage of the entire ship.

[0021] This system solves the problem of harsh ship commissioning environment and can effectively save the ship manufacturing cycle. When the equipment supplier is determined, the joint commissioning of the equipment can be completed during the ship construction process, which accelerates the entire ship delivery cycle. The relevant controls are highly replaceable, and controllers can be freely added to coordinate the software of related equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A framework of an electric ship power test bench system provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of the structure of a motor test bench provided in an embodiment of the present application;

[0025] Figure 3 A schematic diagram of a testing method for an electric ship power test bench system provided in an embodiment of the present application;

[0026] Figure 4 A schematic diagram of an electric ship power test bench laboratory provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application. Unless otherwise defined, the technical terms or scientific terms used in this application should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Including" or "including" and other similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connected", "coupled" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] The preferred embodiments of the present application are described below in conjunction with the drawings in the specification. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In addition, the embodiments and features in the embodiments of the present application may be combined with each other if there is no conflict.

[0029] Figure 1 The framework of an electric ship power test bench system provided in the embodiment of the present application. Figure 1 As shown, the system may include a power supply system and an EMS system required for ship testing, a simulated load, an electric propulsion system, a cooling system, a junction box, and a communication network.

[0030] Figure 4 This is a schematic diagram of a laboratory built based on a test bench system. The frequency converter cabinet is used to control and adjust the speed and torque of the motor. It achieves stepless speed regulation of the motor by changing the power frequency and voltage supplied to the motor, thereby meeting the needs under different working conditions. The motor power analyzer is used to measure and analyze the performance of the motor and its drive system, monitor and record the electrical parameters, mechanical parameters and operating status of the motor in real time, and help evaluate the key indicators of the motor such as efficiency, power factor, torque, speed, etc. The data acquisition unit provides input and output of digital signals and analog signals as well as some communication interfaces to collect relevant parameters. The real-time monitoring system monitors the relevant data of the test bench operation and issues abnormal alarms. The electrical parameter measurement cabinet collects data from the power analyzer, temperature control system, measurement and control unit, as well as data from the power supply, communication network, etc. The console integrates test software, propulsion car clock, EMS, PCS and display screen. The console can simulate and handle faults of the battery system and propulsion system. Displays battery information, propulsion system, and power distribution system related systems. Reserve enough space for electronic and electrical communications and display devices.

[0031] The power system is a battery pack of the ship under test or a battery simulator. The battery simulator simulates the power supply process of the battery pack. Prepare two sets of normal battery packs to be tested, with matching high-voltage wiring harnesses and connectors; if the battery pack is not ready, use a battery simulator. The battery simulator uses a DC regulated power supply to supply low voltage power, and a high-voltage power supply to supply high voltage power to the battery.

[0032] The communication network provides data transmission for the power system, EMS system, electric propulsion system, cooling system, junction box and main control system, and CAN bus can be used for data transmission. CAN bus (Controller Area Network bus) is a serial communication protocol widely used in the fields of automobile and industrial automation. It is designed to efficiently and reliably transmit data between electronic control units (ECUs), especially in application scenarios that require real-time and high reliability. Efficient data transmission: CAN bus supports multi-master mode, and multiple nodes can send and receive data on the network at the same time; the data transmission rate can reach up to 1Mbps (depending on the network length and environmental conditions). High reliability: CAN bus uses differential signal transmission and has strong anti-interference ability. Supports error detection and automatic retransmission mechanism to ensure the accuracy of data transmission.

[0033] The EMS system is provided according to the EMS system of the tested ship. The EMS system is used for power distribution, real-time monitoring of power load and power system status; the electric propulsion system includes the motor to be tested, the motor MCU, and the propulsion control module. The propulsion control module sends relevant control instructions, such as speed and gear signals to the EMS system, and the EMS system then sends the speed or torque model to the motor MCU, and the motor MCU sends the signal to the motor to be tested.

[0034] The combiner box is provided in accordance with the combiner box of the tested ship, which combines the power system, and a busbar is set inside it. A circuit breaker is set on the connection line between the battery pack and the combiner box, and the access status of the battery pack is controlled by the circuit breaker. The motor is connected to the combiner box and powered by the battery; the cooling system is provided in accordance with the cooling system of the tested ship, which includes a cooling water pump as a water pipe to cool the electric propulsion system; the simulated load is connected to the motor to be tested of the electric propulsion system, and the simulated load is used to simulate the load of the propeller on the motor during the ship's navigation.

[0035] It also includes a BMS system for managing the battery status and an EMS system for adjusting the power supply status of the battery pack. The BMS system is used to monitor the operating parameters of the battery pack when it is powered independently and in parallel under different working conditions of the motor.

[0036] like Figure 2 As shown, it also includes a motor test bench, which includes a base 1, a coupling 7, a transmission shaft 8, a torque sensor 10, a simulated load 11 and an auxiliary support device 9. A motor base 2 is set on the base, and a motor mounting frame 5 is set on the motor base 2 for mounting the motor 6 to be tested. The simulated load is a motor, and a gear box can also be used. The coupling 7 and the transmission shaft 8 are used to connect the motor 6 to be tested and the simulated load 11. The torque sensor 10 is used to detect the torque of the motor to be tested, and the auxiliary support device 9 is used to support the transmission shaft 8. It also includes a protective cover 4 and an air spring 3. The air spring 3 is located below the base 1 to reduce the vibration of the base, and the protective cover 4 is used to protect the coupling and the transmission shaft.

[0037] Speed ​​measurement accuracy Speed ​​is one of the most basic parameters in motor performance testing, and speed measurement accuracy is one of the important performance indicators of the test bench. The higher the accuracy, the more accurate the test results. Generally speaking, the speed measurement accuracy should be within ±1rpm to ensure the accuracy and reliability of the test results.

[0038] Torque measurement accuracy Torque is another important parameter in motor performance testing, and torque measurement accuracy is also one of the key performance indicators of the test bench. The higher the accuracy, the more reliable the test results. Generally speaking, the torque measurement accuracy should be within ±0.1Nm to ensure the accuracy and reliability of the test results.

[0039] Load adjustment range and accuracy are another key performance indicator of the test bench. The load adjustment range should cover the entire operating range of the motor to ensure the comprehensiveness and reliability of the test; the load adjustment accuracy should be within ±1N·m to ensure the accuracy and reliability of the test results.

[0040] Data acquisition frequency is one of the important performance indicators of data acquisition and processing in the test bench, which determines the accuracy and resolution of the test data. Generally speaking, the data acquisition frequency should be above 10kHz to ensure the accuracy and reliability of the test data.

[0041] Test accuracy is a comprehensive performance indicator of the test bench, which reflects the stability, accuracy and reliability of the test bench.

[0042] The embodiment of the present application also includes a daily AC power distribution system, which is provided according to the daily AC power distribution system of the tested ship. The daily AC power distribution system includes a distribution board and an inverter. The inverter is connected to the battery pack through a combiner box, and the distribution board is used to control the working status of the inverter.

[0043] The EMS system issues motor speed, power or torque parameter instructions based on the electric propulsion system's request, then determines whether the motor MCU display parameters are consistent with the parameters issued by the EMS, adjusts the motor load by adjusting the simulated load, and records the motor's state parameters under different loads to test and evaluate the motor performance. The EMS system issues a power-on command to the corresponding power load, and determines whether the communication network is transmitting data based on the response status of the power load.

[0044] This system solves the problem of harsh ship debugging environment and can effectively save the ship manufacturing cycle. When the supplier of the equipment is determined, the joint debugging between the equipment can be completed during the construction of the ship, which accelerates the entire delivery cycle of the ship. The relevant controls are highly replaceable. When there is a battery missing on the ship, the entire power grid system and the equipment involved in power supply will not work. When there is a battery, it can be used for power supply. However, if the battery has a long processing cycle, but the bench test has been arranged, the battery simulator can be used for battery power supply simulation, and other related controllers can be tested. For example, the propulsion control module is still in the development stage, but the bench task already needs to be tested, and the available simulation signal has achieved the purpose of the propulsion remote control system. Controllers can be freely added to coordinate the software of related equipment.

[0045] Corresponding to the above system, the present application embodiment also provides a testing method. Figure 3 As shown, including the following:

[0046] High and low voltage power-on and power-off logic test:

[0047] After EMS sends a low-voltage power-on command to the BMS system and the motor MCU, it tests whether the BMS system and the motor MCU wake up for self-test and whether they send feedback signals to the BMS after waking up for self-test;

[0048] After the BMS system issues a high-voltage power-on command, it determines whether the circuit breaker between the battery pack and the combiner box is closed in sequence, and whether the BMS system feeds back a response signal; based on the feedback signals from the BMS system and the motor MCU, it determines whether the BMS system, the motor MCU, and the communication network are abnormal. After the EMS sends a power battery switching command, the motor MCU begins to discharge, and after reaching the appropriate position, it closes all the current battery pack circuit breakers in the combiner cabinet, closes another set of battery pack circuit breakers, and the system is powered on normally at high voltage again.

[0049] The battery system detection method is as follows:

[0050] Check and measure the battery system parameters. The monitoring values ​​should be within the normal range. The monitoring parameters include but are not limited to the following: battery pack total voltage, battery pack SOC, cell temperature, cell voltage, battery compartment (location) ambient temperature, and alarm status.

[0051] Conduct safety protection function tests on the battery system, including but not limited to the following: battery cell overvoltage and undervoltage protection function tests; battery cell overtemperature protection function tests; battery pack fault (overcharge, overdischarge, overcurrent, overtemperature, external short circuit) protection function tests; BMS communication fault protection tests (including internal communication and communication with PMS / EMS / AMS, charging devices and other equipment); battery system emergency stop test; battery system minimum power alarm test; and operating location interlocking test.

[0052] Conduct battery pack operation tests, including but not limited to the following: Manual parallel test: manually put each battery pack into operation in turn, and record the battery system current, voltage, power, temperature and other parameters after the status stabilizes; Automatic parallel test: conduct automatic parallel test of the battery pack through the power control panel on the console, and record the battery system current, voltage, power, temperature and other parameters after stabilization.

[0053] Parallel load test: Put the battery system into the grid, start the propulsion inverter and daily inverter, and record the voltage, current, power, temperature, current difference between battery packs, etc. under various working conditions (load is 25%, 50%, 75%, 100%).

[0054] Carry out charging test according to the charging conditions actually designed for the ship. When the preset charging capacity or charging time is reached, stop the charging process and record the corresponding charging time, start and end SOC, voltage, current, power, temperature, current difference between battery packs, etc.

[0055] Power distribution system

[0056] Conduct tests on the DC power distribution system, including but not limited to the following:

[0057] (1) Complete the operation of the battery circuit, propulsion circuit, charging circuit disconnector and bus tie disconnector on the DC distribution board;

[0058] (2) Verification of protection device setting values;

[0059] (3) The switch interlocking test shall meet the following requirements:

[0060] ①When both ends of the busbar disconnector are energized at the same time, the closing operation cannot be performed;

[0061] ②When the circuit where the maintenance switch is located is energized, the disconnection operation cannot be performed;

[0062] ③ When the busbar disconnector is closed, the insulation monitoring instruments on both sides should not be online at the same time.

[0063] (4) Conduct functional tests of PMS / EMS, including but not limited to the following:

[0064] ① Grid connection / disconnection of battery packs, load power distribution, automatic unloading of non-important loads, power / energy reserve analysis, and overload inquiry;

[0065] ② It can calculate the available power and available electricity of the energy storage system in real time according to the state of charge of the energy storage system;

[0066] ③Control the charging and discharging of the battery system;

[0067] ④ It is to have a power limiting function. When the battery pack is disconnected due to a fault, the propulsion power can be immediately limited according to the situation, so as not to cause other power supply devices on the grid to overload and trip, resulting in power loss to the entire ship;

[0068] ⑤ It should be able to monitor power system faults. When the power supply to the system and equipment on the non-fault line is interrupted, it should be able to automatically execute relevant measures to restore the power supply to the system and equipment;

[0069] ⑥ Verify that the system can automatically enter a safe state when the following situations occur: (a) Power / Energy Management System (PMS / EMS) power supply failure; (b) Power / Energy Management System (PMS / EMS) programmable controller failure; (c) Power / Energy Management System (PMS / EMS) communication failure; (d) Other failures with higher risk levels in the FMEA analysis report.

[0070] (5) Conduct a short-circuit test on the DC busbar system. Before the test, ensure that the battery system and propulsion system function normally. The short-circuit point protection test includes:

[0071] ①Battery output short circuit;

[0072] ② The DC busbar is short-circuited, including the output side of the DC / DC converter fuse, the DC busbar, the inverter unit, the input side of the main propulsion unit fuse, and the inverter output end;

[0073] ③ Short circuit between the positive and negative poles of the input terminal of the DC power distribution system load device (including converter). If the equipment manufacturer can provide the test report of the equipment before leaving the factory, the above test requirements can be exempted.

[0074] Conduct daily AC power distribution system tests, including but not limited to the following:

[0075] (1) Complete the operation of related circuit switches on the daily AC distribution board;

[0076] (2) Security function test, including:

[0077] ① Setting test of protection device;

[0078] ② Inverter protection function test, inverter output short circuit, should include AC daily power distribution system AC busbar three-phase short circuit, AC daily power distribution system power supply device output three-phase short circuit, AC daily power distribution system load input three-phase short circuit, monitor and record the inverter output voltage, current, frequency, isolation transformer and AC distribution board each branch switch status and current.

[0079] Daily inverter test, including but not limited to the following:

[0080] ① Daily inverter no-load test: start and stop the inverter, and record the no-load voltage and frequency of the secondary side of the isolation transformer;

[0081] ② Daily inverter load test: Start the inverter, adjust the load to 25%, 50%, 75%, 100%, 110%, and run for 1 to 5 minutes. Record the inverter output voltage, current, frequency, power, component temperature, voltage harmonics, isolation transformer winding temperature, filter winding temperature and other operating parameters; ③ Daily inverter sudden load and unload test: After the inverter is started, gradually load it to the rated load for stable operation, perform a 100% unload test, and record the change and stabilization time of the inverter output voltage: then add a sudden load of 0-50%-100%, and record the change and stabilization time of the inverter output voltage.

[0082] Propulsion system protection tests include but are not limited to the following:

[0083] (1) Propulsion motor emergency stop test: Start the propulsion motor and run it at rated speed. Test the functions of the emergency stop buttons on the propulsion control panel and propulsion control box respectively;

[0084] (2) Propulsion motor overspeed protection test: The test can be carried out by changing the propulsion overspeed alarm and protection thresholds;

[0085] (3) Propulsion motor starting interlock function test: by simulating a propulsion system fault, test whether the propulsion system can be started when the fault is not reset;

[0086] (4) Propulsion control module power failure test: Test whether the control system can switch to the backup power supply and operate normally after the main power supply fails;

[0087] (5) Communication fault alarm function test: disconnect the communication between the inverter and the propulsion control module, and the propulsion system reports a communication fault;

[0088] Propulsion system load test, including:

[0089] (1) No-load test of each motor;

[0090] (2) Load test for each propulsion motor, according to

[0091] 0-25%-50%-75%-100%-75%-50%-25%-0. Add or subtract load and record the parameters of each test point.

[0092] Cooling system: monitor the temperature changes of each device in the battery system, propulsion system, and power distribution system, and verify the temperature regulation ability of the cooling system.

[0093] Speed ​​test

[0094] The speed test shall include not less than the following number of round trips (downstream and upstream) within a recognized measurement range to verify the ship's free navigation speed. The requirements of the classification society shall also be met. Two round trips at design draught and 85% of the maximum continuous power of the main engine. Two round trips at design draught and maximum continuous power of the main engine.

[0095] During the sea trial, the loading state and the draft of the bow and stern of the ship should be as consistent as possible with the design state of the ship. The displacement error is allowed to be ±3%. There should be enough distance to ensure that the ship has a stable range and the main engine has a stable speed before the ship enters the speed measurement area. The speed test should be carried out under good weather conditions, such as wind force not exceeding BF2, wind and waves not exceeding the second level, and the water flow is stable.

[0096] For each power setting, the test speed must be the average of the average speeds recorded in the round trip direction, and the average speed is: V = (V1 + V2 + V3 + V4) / 4. The ship's yaw is limited to ± 2°. The average speed is calculated using the above formula.

[0097] Load simulation method: The load device in the test bench can adopt different simulation methods, such as gearbox load, motor, etc. The equipment is required to model the operation of the propeller in the fluid.

[0098] Test data processing methods Test data processing methods have an important impact on the accuracy and reliability of test results. Common data processing methods include interpolation, fitting, smoothing, etc. The interpolation method can infer the unmeasured data points in the middle through the existing data points to obtain a more continuous curve; the fitting method can obtain more accurate data points through curve fitting for easy analysis and comparison. The smoothing method can reduce the noise signal of the curve to obtain a smoother curve. Different data processing methods can be selected and applied according to test requirements.

[0099] In the motor performance test, the accuracy and error control of torque and speed measurement have a key impact on the accuracy of the test results. The accuracy and sensitivity of the torque sensor and speed sensor have a great impact on the test results, so it is necessary to select high-precision and high-sensitivity sensors for measurement. At the same time, strict requirements are imposed on the installation and use of the sensor to avoid interference and errors.

[0100] There is a certain relationship between the output power and torque of the motor. By drawing the power-speed and torque-speed curves, we can understand the performance characteristics of the motor more clearly. The power-speed curve can reflect the maximum output power and efficiency of the motor at different speeds, and the torque-speed curve can reflect the torque output characteristics of the motor under different loads. Therefore, the drawing and analysis of the power-speed and torque-speed curves can be added to the test results.

[0101] Analysis of efficiency curve The efficiency of the motor is an important performance indicator, reflecting the efficiency of the motor in converting electrical energy into mechanical energy. By drawing the efficiency-speed curve, we can more intuitively understand the efficiency characteristics of the motor and the highest efficiency point at different speeds. Therefore, the drawing and analysis of the efficiency-speed curve can be added to the test results.

[0102] Analysis of noise and vibration During the test, the motor may generate some noise and vibration, which has a certain impact on the normal operation and safety of the motor. Therefore, the noise and vibration of the motor can be analyzed and evaluated in the test results to adjust the test conditions and improve the test equipment, so as to improve the test effect and the reliability of the results.

[0103] In summary, the selection and application of motor performance testing methods need to consider multiple factors, including load simulation method, data processing method, torque and speed measurement accuracy and error control, etc., to ensure the accuracy and reliability of the test results.

[0104] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present application.

[0105] Obviously, those skilled in the art can make various changes and modifications to the embodiments in the present application without departing from the spirit and scope of the embodiments in the present application. Thus, if these modifications and variations of the embodiments in the present application fall within the scope of the claims and their equivalents in the embodiments of the present application, the embodiments of the present application are also intended to include these modifications and variations.

Claims

1. An electric ship power test bench system, characterized in that: Including the power system and the EMS system, simulated load, electric propulsion system, cooling system, combiner box, and communication network required for ship testing; The power supply system is a plurality of battery packs of the tested ship or a battery simulator, and the battery simulator simulates the power supply process of the battery pack; The communication network provides data transmission for the power supply system, EMS system, electric propulsion system, cooling system, combiner box and main control system; The EMS system is used to distribute electric energy and monitor the power load and power system status in real time; The electric propulsion system includes a motor to be tested, a motor MCU, and a propulsion control module. The propulsion control module sends a ship navigation instruction to the EMS system, and the EMS system converts it into a speed or torque signal to the motor MCU, and the motor MCU controls the motor to rotate; The combiner box combines the power system, a circuit breaker is provided on the connection line between the battery pack and the combiner box, and the motor is connected to the combiner box; the cooling system cools the electric propulsion system; The simulated load is connected to the motor to be tested of the electric propulsion system, and the simulated load is used to simulate the load of the propeller on the motor during the voyage of the ship; The EMS system issues motor speed, power or torque parameter instructions based on the electric propulsion system request, determines whether the motor MCU display parameters are consistent with the parameters issued by the EMS, adjusts the motor load by adjusting the simulated load, and records the motor state parameters under different loads to test and evaluate the motor performance; the EMS system issues a power-on command to the corresponding power load, and determines whether the communication network is transmitting data based on the response status of the power load.

2. The electric ship power test bench system according to claim 1, characterized in that: It also includes a BMS system for managing the battery status. The power system consists of two battery packs. The EMS system adjusts the power supply status of the battery pack. The BMS system is used to monitor the operating parameters of the battery pack when it is powered independently and in parallel under different working conditions of the motor.

3. The electric ship power test bench system according to claim 2, characterized in that: It also includes a motor test bench, which includes a base and a motor base, a coupling, a transmission shaft, a torque sensor, a simulated load and an auxiliary support device located on the base. A motor mounting frame is provided on the motor base for mounting the motor to be tested. The simulated load is a motor. The coupling and the transmission shaft are used to connect the motor to be tested and the simulated load. The torque sensor is used to detect the torque of the motor to be tested, and the auxiliary support device is used to support the transmission shaft.

4. The electric ship power test bench system according to claim 3, characterized in that: It also includes a protective cover and an air spring. The air spring is located below the base and is used to reduce the vibration of the base. The protective cover is used to protect the coupling and the transmission shaft.

5. The electric ship power test bench system according to claim 3, characterized in that: It also includes a daily AC power distribution system, which includes a distribution board and an inverter. The inverter is connected to the battery pack through a combiner box, and the distribution board is used to control the working state of the inverter.

6. A method for testing an electric ship power bench system, characterized in that: The electric ship power test bench system according to any one of claims 1 to 5 comprises: After the EMS sends a low-voltage power-on command to the BMS system and the motor MCU, it tests whether the BMS system and the motor MCU wake up for self-test, and whether a feedback signal is sent to the BMS after waking up for self-test; After the BMS system issues a high voltage power-on command, it is determined whether the circuit breaker between the battery pack and the combiner box is closed in sequence, and whether the BMS system feeds back a response signal; Determine whether the BMS system, motor MCU and communication network are abnormal based on the feedback signals from the BMS system and motor MCU.

7. The electric ship power bench system testing method according to claim 6, characterized in that: Connect the battery pack to the daily AC power distribution system, start the inverter through the distribution board, adjust the simulated load to make the motor load reach 25%, 50%, 75%, 100%, and 110% of the rated power, test the voltage, current, power, temperature of the battery pack when the motor is powered independently and in parallel under the set load, and the current difference between the battery packs to evaluate the performance of the battery pack; Record inverter output voltage, current, frequency, power, component temperature, and voltage harmonics to evaluate inverter performance.

8. The electric ship power bench system testing method according to claim 7, characterized in that: After the inverter is started, it is gradually loaded to the rated load and runs stably for 1 to 5 minutes. The load is reduced to 0, and the change and stabilization time of the inverter output voltage are recorded. Then, the load is changed from 0-50% to 100% for 1 to 5 minutes respectively, and the change and stabilization time of the inverter output voltage are recorded.

9. The electric ship power bench system testing method according to claim 8, characterized in that: It also includes a backup simulation control system for controlling the motor to be tested and the cooling system. When the control program of the motor to be tested and the cooling system is missing, control instructions are manually sent to the test motor and the cooling system through the backup simulation control system to complete the test of the test motor and the cooling system.

10. The electric ship power bench system testing method according to claim 8, characterized in that: It also includes a motor power limiting module. When there is a battery pack failure, the motor power limiting module limits the power of the motor to be tested to avoid overload and power loss of the entire ship.

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