Digital test system and method for underwater power source

Abstract

The invention relates to the technical field of ocean information, and discloses a digital test system and method for an underwater power source, and the system comprises an umbilical cable unit which is used for connecting a variable-frequency power supply and a motor; the generator is connected to the output end of the hydraulic system; the control platform is used for acquiring real-time data related to the underwater power source and simulating the overall system performance of the power source system under a constant load working condition and a load sudden change working condition; the method is also used for determining the adjustment mode of the umbilical cable unit in the simulation process. According to the invention, the overall system performance of the underwater power source under the load sudden change working condition can be tested and verified.

Description

Technical Field

[0001] This invention belongs to the field of underwater power source testing technology, specifically, it relates to a digital testing system and method for underwater power sources. Background Technology

[0002] In modern marine engineering, deep-sea power sources are core components of underwater equipment, and their reliability and stability directly affect the efficiency and safety of underwater operations. However, existing testing methods cannot comprehensively and accurately evaluate the overall system performance of power sources under complex operating conditions, especially under extreme load surges. In systems where long cables drive underwater variable frequency motors to power hydraulic loads, rapid load surges can lead to a surge in current, resulting in insufficient power from the power source; load surges are a critical issue.

[0003] Currently, there is a lack of efficient testing systems that can realistically simulate the actual working environment of deep-sea dedicated underwater power sources, making it a major challenge to accurately verify the performance of power sources under the aforementioned complex working conditions.

[0004] Therefore, there is an urgent need for a system and method that can conduct comprehensive testing of deep-sea dedicated underwater power sources on a digital platform. Summary of the Invention

[0005] To address the technical problems mentioned above, the present invention aims to provide a digital testing system and method for underwater power sources, which can accurately verify the overall system performance under sudden load changes based on the influence of complex underwater environments.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A digital testing system for an underwater power source, wherein the underwater power source system includes a frequency converter and an electric motor and provides power to a hydraulic system, the hydraulic system includes a hydraulic pump and a hydraulic motor, the hydraulic pump receives the mechanical energy output by the electric motor and converts it into hydraulic energy, and the hydraulic motor converts the received hydraulic energy from the hydraulic pump into mechanical energy; the digital testing system includes: Umbilical cable unit, which is used to connect the frequency converter and the motor; A generator connected to the output of the hydraulic system; The control platform is used to acquire real-time data related to the underwater power source, to simulate the overall system performance of the power source system under constant load conditions and load change conditions, and to determine the adjustment method of the umbilical cable unit during the simulation process.

[0007] In some embodiments of this application, the digital testing system further includes: A frequency converter is used to regulate the speed of the electric motor and the hydraulic pump.

[0008] In some embodiments of this application, the digital testing system further includes: The three-phase operating voltage output by the frequency converter is provided to the umbilical cable unit after passing through the filtering unit.

[0009] In some embodiments of this application, the umbilical cable unit is a cable model established based on the underwater environment.

[0010] In some embodiments of this application, a testing method for a digital testing system for underwater power sources is provided, comprising the following steps: Step S1: Set the initial parameter matrix of the umbilical cable unit in the underwater power source system; set the constant load condition and run the power source system; Step S2: Obtain real-time data from the sensor and filter out abnormal data in the real-time data; Step S3: Adjust the umbilical cable unit according to the abnormal data until the abnormal data is eliminated, that is, adjust it to the stable operation of the power source system; Step S4: Obtain the adjustment correspondence between the umbilical cable unit and the abnormal data according to the adjustment process in step S3; Step S5: Set up a sudden load condition, run the power source system, acquire real-time data from the sensors, and filter out abnormal data in the real-time data. Step S6: Using the adjustment correspondence in step S3, adjust the umbilical cable unit to eliminate the abnormal data in step S5; after the abnormal data is eliminated, record the operating mode of the umbilical cable unit under the sudden load condition.

[0011] In some embodiments of this application, adjusting the umbilical cable unit based on abnormal data includes: dynamically adjusting the cross-sectional area, shielding structure, filtering components, insulation material, heat dissipation method, or laying tension of the umbilical cable unit based on abnormal data.

[0012] In some embodiments of this application, the real-time data includes: voltage, current, frequency, harmonics, power, and power factor of the frequency converter; output voltage, current, and harmonic content of the filter; voltage drop and current variation of the umbilical cable unit; speed, torque, current, and voltage of the motor; pressure and flow of the hydraulic system; output voltage, current, and power of the generator; and energy transfer efficiency between various parts of the power source system.

[0013] In some embodiments of this application, the setting of abrupt load conditions includes: changing the opening degree of hydraulic system valves and changing the magnitude of the load driven by the engine.

[0014] In some embodiments of this application, the adjustment of the correspondence includes: when the real-time data of the umbilical cable unit is abnormal, adjusting the cross-sectional area of ​​the umbilical cable unit or the laying tension of the umbilical cable unit or adding insulation material; when the energy transfer efficiency between the parts of the power source system drops to above a threshold, adjusting the length of the umbilical cable unit.

[0015] In some embodiments of this application, the adjustment of the correspondence further includes: adding a shielding structure to the umbilical cable unit when the real-time data of the motor is abnormal; and adding a filtering structure to the umbilical cable unit when the frequency converter power supply is abnormal.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are: (1) A digital test system for testing underwater power sources was established to test and verify the overall system performance of the power source system under sudden load conditions. This provides parameter references for the umbilical cable unit in the design of the power source system and is of great significance for the optimization and improvement of the power source system performance. (2) The digital test system simulates the actual underwater environment and is digitally designed, which is simple and safe, while improving the accuracy of power source system performance testing and verification under braking conditions.

[0017] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a block diagram of an embodiment of the digital testing system for underwater power sources proposed in this invention.

[0019] Figure 2 This is a flowchart of an embodiment of the digital testing method for underwater power sources proposed in this invention.

[0020] Figure 3 This is a schematic diagram of the structure of the control platform for underwater power sources proposed in this invention.

[0021] Figure label: 10. Variable frequency power supply; 20. Filter; 30. Umbilical cable unit; 40. Motor; 50. Hydraulic system; 60. Generator; 70. Control platform; 71. Data acquisition module; 72. Data calculation module; 73. Instruction generation module. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. In the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] A high-efficiency digital testing system for deep-sea dedicated underwater power sources for large-scale equipment is proposed. This system can accurately test and verify the overall system performance of the power source under conditions of sudden load changes, taking into account the influence of the complex underwater environment. Under these conditions, it determines whether overvoltage, overcurrent, and overpower exist, and records the parameter limits for each condition, thus providing parameter references for system design.

[0027] In some embodiments of this application, the underwater power source includes a frequency converter 10 and a motor 40, wherein the frequency converter 10 generates electricity and transmits electrical signals to the motor 40.

[0028] The underwater power source is used to provide power to underwater equipment. In some embodiments of this application, it is based on a digital control platform 70. To better reflect the actual working conditions in the underwater environment, see [link / reference needed]. Figure 1 The hydraulic system 50 is used to simulate the heavy load of underwater equipment in an underwater environment. The electric motor 40 converts electrical energy into mechanical energy and transmits it to the hydraulic system 50.

[0029] The high pressure and low temperature in the complex underwater environment lead to high viscosity of hydraulic oil. The adverse effects of high pressure and high viscosity of hydraulic oil in deep water are that the starting load of the electric motor 40 is large, making it difficult to start. Therefore, in this application, the hydraulic system 50 is used to simulate the load and realize the simulation of large load starting.

[0030] Starting under heavy load involves both a large load and a large moment of inertia. During the starting phase of the motor 40, when the motor 40 is not rotating, it cannot provide a large load. Therefore, in some embodiments of this application, the hydraulic system 50 serves as the load for the entire underwater power source, including a hydraulic pump (not shown), valves (not shown), and a hydraulic motor (not shown). The hydraulic pump receives the mechanical energy output from the motor 40 and converts it into hydraulic energy, while the hydraulic motor converts the hydraulic energy into mechanical energy. In operation, the viscosity of the hydraulic oil is increased to increase the moment of inertia during startup, simulating the problem of large starting loads in actual underwater environments.

[0031] After simulating the load of the underwater power source, the underwater power source is tested and verified using the digital testing system provided in this application.

[0032] In some embodiments of this application, for the purpose of testing and verification, see [link to relevant documentation]. Figure 1 The digital testing system also includes a generator 60, which receives mechanical energy transmitted from a hydraulic motor.

[0033] The generator 60 can be connected to a variable resistor as its load to receive the electrical energy output by the generator 60, or it can be connected to a four-quadrant frequency converter as its load to feed the generated electrical energy back to the grid, and the generator 60 can be used as the load of the hydraulic system 50.

[0034] In some embodiments of this application, the digital testing system also includes a frequency converter (not shown). The motor 40 and the hydraulic pump are coaxial. Therefore, the frequency converter can be used to simultaneously adjust the speed of the motor 40 and the hydraulic pump. Adjusting the speed of the hydraulic pump changes the output flow and pressure of the hydraulic pump, thereby achieving power control of the underwater equipment. Adjusting the speed of the motor 40 achieves precise control of the power source system, achieving the purpose of energy saving and high efficiency.

[0035] In some embodiments of this application, when the motor 40 is working normally to supply power to the load, the frequency converter 10 can directly transmit the three-phase operating voltage to the motor 40; and in order to improve the quality of the output power of the frequency converter 10, the frequency converter 10 can be connected to a filter unit (not shown), and the three-phase operating voltage output by the frequency converter 10 is filtered out by the filter unit to remove noise or interference before being supplied to the motor 40.

[0036] In some embodiments of this application, the digital testing system further includes an umbilical cable unit 30, which is used to connect the frequency converter power supply 10 and the motor 40.

[0037] In actual underwater environmental engineering, the deep-sea umbilical cable drives the motor 40 to drive the hydraulic load. In actual use, the umbilical cable may cause the following problems: (1) The cable is hundreds or even thousands of meters long, and the increased resistance leads to an increased voltage drop, especially when the motor 40 starts or is under heavy load, which may cause insufficient voltage of the motor 40; (2) The long cable coil effect is stronger, which may cause voltage overshoot or harmonics generated by interaction with the frequency converter; (3) The inter-cable capacitance and ground capacitance are significant, which may cause peak voltage or common-mode interference; (4) High-frequency PWM modulation will form strong reflection and electromagnetic radiation on the long cable; (5) The long cable causes signal transmission delay and attenuation; (6) When the motor 40 starts or the load changes suddenly, the voltage drops / rebounds instantaneously, causing system instability.

[0038] Therefore, in some embodiments of this application, in order to take into account the impact of long cables on underwater power sources, the frequency converter 10 inputs frequency-converted power to the motor 40 through the umbilical cable unit 30, wherein the umbilical cable unit 30 adopts an existing cable model suitable for underwater environments, and its parameters can be set and modified by existing software.

[0039] To simulate a real underwater environment, the digital testing system introduces random disturbance signals to simulate the underwater environment, thereby enabling digital testing of underwater power sources.

[0040] Disturbances in water flow velocity can cause current fluctuations and load fluctuations. Therefore, in the digital test system of this application, current fluctuations and load fluctuations are simulated to simulate the impact of water flow.

[0041] In some embodiments of this application, a random disturbance current is injected into the input terminal of the umbilical cable unit 30 as a current fluctuation caused by water flow disturbance.

[0042] In some embodiments of this application, the hydraulic system 50 and generator 60 as described above, and the load connected to them as a whole, serve as the load of an underwater power source. Load fluctuations can be simulated by changing the load connected to the hydraulic system 50 and / or generator 60.

[0043] A random disturbance signal can be generated to the valve opening of the hydraulic system 50 to simulate the load fluctuation of the hydraulic system 50. Alternatively, a random disturbance signal (e.g., simulated ocean temperature or external environmental interference with the load size) can be applied to the variable resistor connected to the generator 60 to change the resistance value of the variable resistor to simulate load fluctuation. The frequency of the four-quadrant frequency converter (not shown) connected to the generator 60 can also be changed to simulate load fluctuation.

[0044] Complex underwater geological environments can manifest as sudden load changes, which can instantly alter the opening of valves in hydraulic system 50 or the resistance of the variable resistor connected to generator 60, thereby causing a sudden and significant change in the load torque of hydraulic system 50.

[0045] In some embodiments of this application, the test system is based on the control platform 70 to simulate the working conditions. The control platform 70 can acquire real-time data related to the underwater power source to simulate the overall system performance of the power source system under constant load conditions and load change conditions; it is also used to determine the adjustment method of the umbilical cable unit 30 during the simulation process.

[0046] Reference Figure 3 As shown, the control platform 70 includes a data acquisition module 71, a data calculation module 72, and an instruction generation module 73. The data acquisition module 71 includes various sensors to acquire operating parameters of the frequency converter 10, filter 20, umbilical cable unit 30, motor 40, hydraulic system 50 and generator 60, such as voltmeters and ammeters.

[0047] In addition, the data acquisition module 71 also collects relevant parameters about the umbilical cable unit 30 through the input module of the test platform. The relevant parameters include the length, frequency, resistance, inductance, mutual inductance, inter-line capacitance, line-to-ground capacitance, and mutual resistance of the umbilical cable.

[0048] The data calculation module 72 is communicatively connected to the data acquisition module 71 and the instruction generation module 73. The data calculation module 72 can calculate the parameters that need to be adjusted and the range of adjustment of the parameters based on the acquired data.

[0049] The instruction generation module 73 is used to generate control instructions based on the calculation results obtained by the data calculation module 72, and transmit the control instructions to the corresponding part of the power source system.

[0050] When the control platform 70 performs a constant load simulation, the valve opening of the hydraulic system 50 remains unchanged, and the load resistance driven by the generator 60 remains unchanged.

[0051] The instruction generation module 73 is used to generate start-up instructions and transmit them to various parts of the power source system. The test system simulates an underwater environment.

[0052] The data calculation module 72 is used to store the normal operating range of the power source system operating parameters, and also to compare the operating data received by the data acquisition module 71 with its normal operating range to filter out abnormal data.

[0053] The instruction generation module 73 is also used to output adjustment instructions for the cross-sectional area, shielding structure, filtering components, insulation materials, heat dissipation method, or laying tension of the umbilical cable unit 30 based on abnormal data.

[0054] The data calculation module 72 is also used to compare the changes in the adjustment command and the abnormal data to obtain the adjustment correspondence of the umbilical cable unit 30.

[0055] When the control platform 70 simulates a sudden load change, the instruction generation module 73 outputs instructions to the hydraulic system 50 to increase or decrease the valve opening. In some other embodiments, when the control platform 70 simulates a sudden load change, the instruction generation module 73 sends instructions to the motor to adjust its load.

[0056] When the power source system is started, the test system simulates the underwater environment; the data acquisition module 71 is used to receive real-time data from each part; if the data calculation module 72 obtains abnormal data based on the real-time data, the instruction generation module 73 generates the corresponding control instruction according to the adjustment correspondence and sends it to the corresponding part of the power source system.

[0057] To ensure the reliability and stability of underwater power sources, their performance needs to be tested, especially in performance evaluation under conditions of sudden load changes. Therefore, this application also proposes a digital testing method for underwater power sources, referring to... Figure 2 As shown, it includes the following steps: Step S1: Set the initial parameter matrix of the umbilical cable unit 30 in the underwater power source system; set the constant load condition and run the power source system. Specifically, in step S11, the parameter elements in the initial parameter matrix include: the length, frequency, resistance, inductance, mutual inductance, inter-line capacitance, line-to-ground capacitance, and mutual resistance of the umbilical cable. During the setup process, the specific values ​​of the parameter elements are determined based on the power requirements of the power source system.

[0058] S12. A constant load condition is achieved by keeping the valve opening of the hydraulic system 50 constant and keeping the load resistance driven by the generator 60 constant.

[0059] S13. Under this constant load condition, the power source system is operated.

[0060] Step S2: Obtain real-time data from the sensor and filter out abnormal data in the real-time data; In the digital testing system for the power source, the operating parameters of the frequency converter 10, filter 20, umbilical cable unit 30, motor 40, hydraulic system 50 and generator 60 can be obtained through various sensors, such as voltmeters and ammeters.

[0061] Specifically, for the frequency converter 10, its parameters such as voltage, current, frequency, harmonics, power, and power factor can be obtained; For filter 20, obtain its output voltage, current, and harmonic content.

[0062] For umbilical cable unit 30, voltage drop and current change can be obtained.

[0063] For motor 40, speed, torque, current and voltage can be obtained.

[0064] For hydraulic system 50, pressure and flow rate can be obtained.

[0065] For generator 60, output voltage, current, and power can be obtained.

[0066] At the same time, for the entire power source system, it is also necessary to obtain the system efficiency, including the efficiency of each link from the power source to the motor, from the motor to the hydraulic system 50, and from the hydraulic system 50 to the generator 60.

[0067] In addition, the response time, stability, and fluctuation range of parameters such as voltage, current, and frequency under load changes are obtained.

[0068] Step S3: Adjust the umbilical cable unit 30 according to the abnormal data until the abnormal data is eliminated, that is, adjust it to the stable operation of the power source system; For abnormal data, each part of the system is set with a rated value for the running data during the testing process. When the running data exceeds the rated value, it means that abnormal data has occurred.

[0069] For example, if the output line voltage of the frequency converter 10 deviates from the rated value by more than ±5%, the output frequency deviates by more than ±2Hz, or the total harmonic distortion (THD) of the bus voltage is greater than 8%, the frequency converter 10 is immediately judged to be abnormal.

[0070] When the output line voltage THD of filter 20 exceeds 5% or the phase current THD exceeds 20%, the filter is judged to be in failure.

[0071] If the voltage drop at the end of the umbilical cable unit 30 exceeds 3% of the line's rated voltage or the three-phase current imbalance rate of the coaxial cable is higher than 5%, the umbilical cable unit 30 is judged to be abnormal.

[0072] If the current of the synchronous motor 40 exceeds 110% of the rated current or the three-phase current imbalance rate is higher than 5%, and at the same time the steady-state deviation of the motor speed exceeds ±5% of the set speed or the peak-to-peak value of the electromagnetic torque fluctuation is higher than 10% of the rated torque, the motor 40 is judged to be abnormal.

[0073] When the pressure of the main oil circuit of the hydraulic system deviates from the set value by ±5% or the flow rate deviates from ±5%, and the peak-to-peak pressure pulsation exceeds 8% of the rated pressure, it is judged as a hydraulic abnormality.

[0074] When the line voltage at generator terminal 60 deviates from the rated ±5%, the line current exceeds the rated 110%, or the output active power decreases by more than 10% compared to the theoretical mechanical input power, generator terminal 60 is judged to be abnormal.

[0075] When the efficiency of the "power supply-motor", "motor-hydraulic pump", and "hydraulic-generator 60" segments decreases by more than 2%, 3%, and 3% respectively compared to the design efficiency, or when the absolute value of the decrease in the total system efficiency is ≥5%, it is judged as an efficiency anomaly. When the overshoot rate of any key quantity (bus voltage, output frequency, motor speed, main oil pressure) exceeds the rated upper limit (voltage 5%, frequency 1%, speed 10%, pressure 8%) or the adjustment time exceeds 150ms after a load step, it is also considered as a dynamic anomaly.

[0076] The cross-sectional area, shielding structure, filtering components, insulation materials, heat dissipation method, or laying tension of the umbilical cable unit 30 are dynamically adjusted based on abnormal data.

[0077] For example, when the voltage drop at the end of the umbilical cable unit 30 exceeds 3% of the rated value or the peak current exceeds 110% of the rated value, the existing conductor cross-sectional area is immediately increased by one level according to the ampere current carrying capacity formula or a spare core wire of equal length is connected in parallel. When the three-phase current imbalance rate is higher than 5% or the zero-sequence current rises to 2% of the rated value, a coaxial symmetrical shield is added to the outside of the cable core and the sheath pitch is adjusted to reduce the parasitic impedance difference. When the total harmonic distortion rate of the bus voltage exceeds 8% or the amplitudes of the fifth and seventh harmonics are greater than 5% and 3% of the fundamental frequency, respectively, an LCL or active filter unit is connected in series at the power supply end of the umbilical cable to suppress harmonic backflow and heat generation. When the dielectric loss factor or leakage current exceeds 150% of the factory value, replace it with high dielectric strength cross-linked polyethylene insulation or add a water barrier armor layer to improve the withstand voltage and resistance to water tree aging. When the cable core temperature rises above 90°C for 5 consecutive minutes or the local tensile strain rate of the outer sheath exceeds 2% / s, start the cable internal oil cooling or seawater spraying system and reduce the mechanical tension to below the design value. When the efficiency of a system segment decreases by more than 2% due to cable loss, the transmission power level can be increased by shortening the cable length or deploying repeater converters in segments. This enables dynamic adjustment of the umbilical cable cross-sectional area, shielding structure, filter components, insulation materials, heat dissipation methods, and deployment tension to address various operational data such as abnormal voltage drop, harmonic anomalies, leakage current anomalies, and thermo-mechanical anomalies, ensuring reliable power supply to the deep-sea electric drive system under sudden load changes.

[0078] Step S4: Obtain the adjustment correspondence between the umbilical cable unit 30 and the abnormal data according to the adjustment process in step S3; The adjustment correspondence includes: when the real-time data of the umbilical cable unit 30 is abnormal, adjusting the cross-sectional area of ​​the umbilical cable unit 30 or the laying tension of the umbilical cable unit 30 or adding insulation material; when the energy transfer efficiency between the parts of the power source system drops to above the threshold, adjusting the length of the umbilical cable unit 30.

[0079] When the real-time data of the motor 40 is abnormal, a shielding structure is added to the umbilical cable unit 30; when the frequency converter 10 is abnormal, a filtering structure is added to the umbilical cable unit 30.

[0080] Step S5: Set up a sudden load condition, run the power source system, acquire real-time data from the sensors, and filter out abnormal data in the real-time data. Sudden load conditions can be set in two ways: The entire hydraulic system 50 drives the engine as the load of the whole power source. First, the opening of the valves in the hydraulic system 50 can be changed to adjust the hydraulic pressure and flow rate, thereby changing the load torque brought to the underwater power source and thus setting the load change.

[0081] The valve opening directly affects the fluid flow rate and system pressure. When the valve opening increases, the fluid flow resistance decreases, the flow rate increases, and the motor load decreases accordingly; conversely, when the valve opening decreases, the fluid flow resistance increases, the flow rate decreases, and the motor load increases accordingly. In this way, precise control of the motor load can be achieved, thereby simulating sudden load changes.

[0082] In addition, the load driven by the engine can also be changed. At this time, the hydraulic system 50 also needs to adjust the hydraulic pressure and flow to change the load torque, and can also complete the setting for sudden load changes.

[0083] Step S6: Using the adjustment correspondence in step S3, adjust the umbilical cable unit 30 to eliminate the abnormal data in step S5; after the abnormal data is eliminated, record the operating mode of the umbilical cable unit 30 under the sudden load condition.

[0084] Thus, using the testing method described in this scheme, the overall system performance under sudden load changes was accurately verified based on the influence of complex underwater environments. This not only reveals the system's performance changes under sudden load changes, but also allows for adjustments to the umbilical cable unit 30 based on the corresponding relationships, thereby obtaining a stable power source system and providing a basis for adjusting real power source systems.

[0085] Compared with the prior art, the advantages and positive effects of the present invention are: (1) A digital test system for testing underwater power sources is established to test and verify the overall system performance of the power source system under sudden load conditions. This provides parameter references for the umbilical cable unit 30 in the power source system design and is of great significance for the optimization and improvement of the power source system performance. (2) The digital test system simulates the actual underwater environment and is digitally designed, which is simple and safe, while improving the accuracy of power source system performance testing and verification under braking conditions.

[0086] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims

1. A digital testing system for an underwater power source, wherein the underwater power source system includes a frequency converter and an electric motor and provides power to a hydraulic system, the hydraulic system including a hydraulic pump and a hydraulic motor, the hydraulic pump receiving mechanical energy converted from the output of the electric motor and converting it into hydraulic energy, and the hydraulic motor converting the received hydraulic energy from the hydraulic pump into mechanical energy; characterized in that, The digital testing system includes: Umbilical cable unit, which is used to connect the frequency converter and the motor; A generator connected to the output of the hydraulic system; The control platform is used to acquire real-time data related to the underwater power source, to simulate the overall system performance of the power source system under constant load conditions and load change conditions, and to determine the adjustment method of the umbilical cable unit during the simulation process.

2. The digital testing system according to claim 1, characterized in that, The digital testing system also includes: A frequency converter is used to regulate the speed of the electric motor and the hydraulic pump.

3. The digital testing system according to claim 1, characterized in that, The three-phase operating voltage output by the frequency converter is provided to the umbilical cable unit after passing through the filtering unit.

4. The digital testing system according to claim 1, characterized in that, The umbilical cable unit is a cable model established based on the underwater environment.

5. The digital testing system according to claim 4, characterized in that, The testing method of the digital testing system includes the following steps: Step S1: Set the initial parameter matrix of the umbilical cable unit in the underwater power source system; set the constant load condition and run the power source system; Step S2: Obtain real-time data from the sensor and filter out abnormal data in the real-time data; Step S3: Adjust the umbilical cable unit according to the abnormal data until the abnormal data is eliminated, that is, adjust it to the stable operation of the power source system; Step S4: Obtain the adjustment correspondence between the umbilical cable unit and the abnormal data according to the adjustment process in step S3; Step S5: Set up a sudden load condition, run the power source system, acquire real-time data from the sensors, and filter out abnormal data in the real-time data. Step S6: Using the adjustment correspondence in step S3, adjust the umbilical cable unit to eliminate the abnormal data in step S5; after the abnormal data is eliminated, record the operating mode of the umbilical cable unit under the sudden load condition.

6. The digital testing system according to claim 5, characterized in that, The adjustment of the umbilical cable unit based on abnormal data includes: dynamically adjusting the cross-sectional area, shielding structure, filtering components, insulation materials, heat dissipation method, or laying tension of the umbilical cable unit based on abnormal data.

7. The digital testing system according to claim 6, characterized in that, The real-time data includes: voltage, current, frequency, harmonics, power, and power factor of the frequency converter; output voltage, current, and harmonic content of the filter; voltage drop and current variation of the umbilical cable unit; speed, torque, current, and voltage of the motor; pressure and flow of the hydraulic system; output voltage, current, and power of the generator; and energy transfer efficiency between various parts of the power source system.

8. The digital testing system according to claim 5, characterized in that, The load conditions that cause sudden changes include: changing the opening degree of hydraulic system valves and changing the magnitude of the load driven by the engine.

9. The digital testing system according to claim 5, characterized in that, The adjustment correspondence includes: when the real-time data of the umbilical cable unit is abnormal, adjusting the cross-sectional area of ​​the umbilical cable unit or the laying tension of the umbilical cable unit or adding insulation material; when the energy transfer efficiency between the parts of the power source system drops to above the threshold, adjusting the length of the umbilical cable unit.

10. The digital testing system according to claim 5, characterized in that, The adjustment correspondence also includes: when the real-time data of the motor is abnormal, a shielding structure is added to the umbilical cable unit; when the frequency converter power supply is abnormal, a filtering structure is added to the umbilical cable unit.

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