A high-power turbo-shaft engine test stand electrical system

Abstract

The utility model relates to high -power turbo shaft engine test board electrical system belongs to engine test technical field, including alternating current source, test board controller, first alternating current direct current converter, second alternating current direct current converter, direct current direct current conversion unit, alternating current source connects respectively dynamometer, emergency power supply, still through first alternating current direct current converter connection fuel oil electric governing pump distribution input end, through second alternating current direct current converter connection starting generator distribution input end, emergency power supply passes through direct current direct current conversion unit and connects engine electronic controller, test board controller respectively, the system still includes distributed data acquisition module and sensor signal isolation unit. The existing turbo shaft engine test board electrical device electrical wiring complex, control precision low, system reliability poor problem is solved.

Description

Technical Field

[0001] This utility model relates to the field of engine testing technology, and in particular to an electrical system for a high-power turboshaft engine test bench. Background Technology

[0002] With the increasingly widespread application of high-power turboshaft engines, the demand for testing high-power turboshaft engines above 2000kW is growing significantly. Turboshaft engines above 2000kW are characterized by their large scale, high speed, and more stringent dynamic response requirements. If they are to be applied to UAVs, the primary issue is to fully verify the compatibility between the engine's electrical system and the UAV's avionics system. Therefore, improvements to the existing test bench's electrical system are necessary. However, because the electrical system is a distributed system, the existing test bench's electrical wiring is complex, long, and difficult to maintain. It is difficult to eliminate the impact of the high temperature, high vibration, and strong electromagnetic environment generated during high-power engine testing on the tests; the lack of safety and redundancy design results in poor reliability of the test bench's electrical system.

[0003] Currently, there is no technical solution for testing high-power turboshaft engines that can solve the problems of complex electrical wiring and poor system reliability in existing test bench electrical systems. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide an electrical system for a high-power turboshaft engine test bench, in order to solve the problems of complex electrical wiring and poor system reliability of existing turboshaft engine test bench electrical systems.

[0005] This utility model embodiment provides an electrical system for a high-power turboshaft engine test bench. The system includes an AC power supply, an emergency power supply, a first AC-DC converter, a second AC-DC converter, and a DC-DC conversion unit.

[0006] The AC power output terminal is connected to the power input terminal of the dynamometer in the test bench, and is also connected to the emergency power input terminal and the input terminal of the first AC-DC converter. The output terminal of the first AC-DC converter is connected to the power input terminal of the fuel electric regulating pump in the engine.

[0007] The output terminal of the AC power supply is also connected to the input terminal of the second AC-DC converter, and the output terminal of the second AC-DC converter is connected to the power distribution input terminal of the starter generator in the test bench.

[0008] The emergency power supply output terminal is connected to the input terminal of the DC-DC conversion unit, and the output terminal of the DC-DC conversion unit is connected to the power distribution input terminal of the engine electronic controller and the power distribution input terminal of the test bench controller.

[0009] The beneficial effects of the above technical solution are as follows: The electrical system of the high-power turboshaft engine test bench provided by this utility model embodiment includes an AC power supply, a first AC-DC converter, a second AC-DC converter, and a DC-DC conversion unit. The AC power supply is used as the total power supply for the test bench and the engine. Compared with the DC single-phase power supply commonly used in the prior art, the power transmission efficiency is higher, improving the stability and reliability of the power supply. The AC power supply is connected to the power distribution input terminal of the engine fuel electric regulating pump through the first AC-DC converter and to the starter generator through the second AC-DC converter, avoiding the problem of mutual interference caused by using the same AC-DC converter to power both the fuel electric regulating pump and the starter generator simultaneously. The emergency power supply output terminal is connected to the power distribution input terminal of the engine electronic controller and the power distribution input terminal of the test bench controller through the DC-DC conversion unit. This is to ensure that the test bench controller still has power supply in the event of a sudden power failure of the main power supply, improving the system reliability and emergency response capability.

[0010] Based on further improvements to the above system, the AC power supply is connected to the input terminals of the first AC-DC converter and the second AC-DC converter respectively using a three-phase five-wire connection.

[0011] The beneficial effects of the above-mentioned further improvement scheme are: using AC power as the main power supply for the test bench and engine, and using three-phase wireless wiring to connect the input terminals of the first AC-DC converter and the second AC-DC converter, compared with the DC single-phase power supply commonly used in the prior art, can achieve higher power transmission efficiency and improve power supply stability and reliability.

[0012] Based on further improvements to the above system, both the first AC-DC converter and the second AC-DC converter adopt AC-DC converters with an output of DC270V.

[0013] The beneficial effects of the above-mentioned further improvement scheme are: both the first AC-DC converter and the second AC-DC converter adopt AC-DC converters with an output of DC270V. Compared with the AC-DC converters with an output of DC28V commonly used in the prior art, shorter cables can be used to connect the starter generator or the fuel electric regulating pump, minimizing the weight and space occupied by electrical wiring, and helping to reduce the difficulty of assembling the engine on the test bench.

[0014] Based on further improvements to the above system, the DC-DC conversion unit includes a DC 28V power converter, a first DC 24V power converter, and a DC 12V power converter.

[0015] The emergency power output terminal is connected to the power input terminal of the engine electronic controller via the DC 28V power converter; the emergency power output terminal is also connected to the power input terminal of the human-machine interface of the test bench via the first DC 24V power converter; the emergency power output terminal is also connected to the power input terminal of the test bench controller via the DC 12V power converter.

[0016] The beneficial effects of the above-mentioned further improvement scheme are as follows: The emergency power supply provides power to the control subsystem. Specifically, it is connected to the power distribution input terminal of the engine electronic controller through the DC 28V power converter, to the power distribution input terminal of the test bench human-machine interface through the first DC 24V power converter, and to the test bench controller through the DC 12V power converter. This ensures that in the event of a sudden power failure of the AC power supply, which serves as the main power source, the engine electronic controller, the test bench human-machine interface, the sensor signal isolation unit, and the test bench controller can still obtain power supply based on their connection to the emergency power supply, thereby improving the power supply resilience and reliability.

[0017] Based on further improvements to the above system, the electrical system also includes a data acquisition module and a sensor signal isolation unit;

[0018] The DC-DC conversion unit also includes a second 24V DC power converter;

[0019] The emergency power supply output terminal is also connected to the power distribution input terminal of the data acquisition module;

[0020] The emergency power output terminal is also connected to the power distribution input terminal of the sensor signal isolation unit through the second DC 24V power converter. The signal input terminal of the sensor signal isolation unit is connected to the sensor in the test bench or engine, and the output terminal is connected to the signal input terminal of the data acquisition module.

[0021] The beneficial effects of the above-mentioned further improvement scheme are as follows: the emergency power supply output terminal is connected to the sensor signal isolation unit through the second DC 24V power converter, and also connected to the power distribution input terminal of the data acquisition module. This allows the data acquisition module and the sensor signal isolation unit to still receive power supply based on the connection structure with the emergency power supply when the main power supply suddenly fails, thereby improving the power supply resilience. The connection structure of the sensor signal isolation unit input terminal connecting to the sensor in the test bench or engine and the output terminal connecting to the signal input terminal of the data acquisition module helps to shield the adverse effects of interference generated during testing on the acquired sensor signals, thereby improving the reliability of the test.

[0022] Based on further improvements to the above system, the data acquisition module includes multiple data acquisition units; the sensor signal isolation unit includes multiple isolators; each data acquisition unit is connected to one isolator.

[0023] The data acquisition unit and the isolator are arranged in pairs near the corresponding sensors on the engine or test bench, wherein,

[0024] Each data acquisition unit's signal input terminal is connected to the corresponding isolator output terminal via a shielded cable;

[0025] Each isolator input is connected to the corresponding sensor signal output via a shielded cable.

[0026] The beneficial effects of the above-mentioned further improvement scheme are as follows: Each data acquisition unit of the data acquisition module is positioned close to the location of its corresponding sensor, shortening the distance between the data acquisition unit and the sensor group. Compared to the existing technology's use of an integrated data acquisition device with a fixed position, this significantly reduces the amount of cabling, decreasing the length from the commonly used 10-meter range to only half a meter, reducing cabling difficulty, and making the cabling structure simpler and easier to maintain. For different types of sensors, data acquisition units with more suitable parameters can be used for connection. Compared to the existing technology's use of a single-configuration integrated data acquisition device to connect each sensor, parameter adaptability is better, facilitating the acquisition of better signals. The connection structure, where the data acquisition unit is connected to the corresponding isolator via shielded cable, and the corresponding isolator and corresponding sensor are connected via shielded cable, helps improve the ability of the data acquisition signal to cope with the high temperature, high vibration, and strong electromagnetic interference environment during test bench operation. This helps to obtain more accurate and stable sensor signals compared to existing connection structures, further improving the reliability and accuracy of the test bench's test results.

[0027] Based on further improvements to the above system, the system also includes an industrial control computer; all data acquisition unit signal output terminals are connected to the signal input terminals of the industrial control computer via communication cables, and the industrial control computer is also connected to the test bench controller via communication cables.

[0028] The beneficial effects of the above-mentioned further improvement scheme are: the signal output terminals of the data acquisition units are all connected to the signal input terminals of the industrial control computer through communication cables, and the industrial control computer is connected to the connection mechanism of the test bench controller through communication cables, which helps to centrally acquire sensor signals, facilitates centralized management of test results, and improves efficiency and reliability.

[0029] Based on further improvements to the above system, the emergency power supply is also connected to the power distribution input terminal of the dynamometer controller in the test bench.

[0030] The beneficial effect of the above-mentioned further improvement scheme is that the connection structure of the emergency power supply to the power distribution input terminal of the dynamometer controller ensures the reliability of the power distribution of the dynamometer controller.

[0031] Based on further improvements to the above system, the electrical system also includes multiple sets of contactors and motor circuit breakers; each set includes a contactor and a motor circuit breaker connected in series, the input terminal of each set of contactors is connected to the AC power output terminal, and the output terminal of each set of motor circuit breakers is connected to a power distribution input terminal of the test bench.

[0032] The beneficial effects of the above-mentioned further improvement scheme are as follows: the AC power supply is connected to the return water pump motor, cooling tower motor, dynamometer hydraulic motor, lubricating oil pump motor, fuel oil seal pump heater, and fuel oil seal pump motor respectively through contactors and motor circuit breakers, which helps to enhance the protection of the motor. In the event of an abnormality during frequent starting and operation, the circuit can be automatically cut off to avoid damage to the motor.

[0033] Based on further improvements to the above system, the electrical system also includes a frequency converter, which is installed on the dynamometer; the AC power supply is connected to the power input terminal of the water pump motor of the dynamometer through the frequency converter.

[0034] The beneficial effects of the above-mentioned further improvement scheme are: the connection structure of the AC power supply to the power distribution input terminal of the dynamometer's water pump motor through the frequency converter provides a more reliable power supply and distribution to the frequency converter based on the characteristics of AC power, which is conducive to improving the reliability of the test.

[0035] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the description and accompanying drawings, which are particularly pointed out. Attached Figure Description

[0036] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0037] Figure 1 is a schematic diagram of the test platform structure according to an embodiment of the present invention.

[0038] Figure 2 This is a schematic diagram of the electrical structure of the generator in an embodiment of this utility model.

[0039] Figure 3 This is a schematic diagram of the connection structure between the data acquisition module and the sensor isolation unit in an embodiment of this utility model. Detailed Implementation

[0040] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0041] A specific embodiment of this utility model discloses a high-power turboshaft engine test bench, such as... Figure 1 As shown.

[0042] The system includes an AC power supply, an emergency power supply, a first AC-DC converter, a second AC-DC converter, and a DC-DC conversion unit, wherein...

[0043] The AC power output terminal is connected to the power input terminal of the dynamometer in the test bench, and is also connected to the emergency power input terminal and the input terminal of the first AC-DC converter. The output terminal of the first AC-DC converter is connected to the power input terminal of the fuel electric regulating pump in the engine.

[0044] The output terminal of the AC power supply is also connected to the input terminal of the second AC-DC converter, and the output terminal of the second AC-DC converter is connected to the power distribution input terminal of the starter generator in the test bench.

[0045] The emergency power supply output terminal is connected to the input terminal of the DC-DC conversion unit, and the output terminal of the DC-DC conversion unit is connected to the power distribution input terminal of the engine electronic controller and the power distribution input terminal of the test bench controller.

[0046] Typically, a test bench for a turboshaft engine includes a dynamometer for extracting engine power and a starter motor for starting the engine. The engine under test is mechanically connected to the dynamometer and the starter generator, respectively. The test bench is usually electrically connected to a single-phase DC power supply to obtain a power supply signal.

[0047] To meet the testing requirements of a 2000kW high-power turboshaft engine, this embodiment discloses an improved electrical system, specifically including an AC power supply, an emergency power supply, a first AC-DC converter, a second AC-DC converter, and a DC-DC conversion unit, to replace the existing test bench electrical system.

[0048] Furthermore, the AC power supply is connected to the input terminals of the first AC-DC converter and the second AC-DC converter respectively via a three-phase five-wire connection.

[0049] Furthermore, both the first AC-DC converter and the second AC-DC converter are AC-DC converters with an output of DC270V.

[0050] Furthermore, the electrical system also includes multiple sets of contactors and motor circuit breakers; each set includes contactors and motor circuit breakers connected in series, the input terminal of each set of contactors is connected to the AC power output terminal, and the output terminal of each set of motor circuit breakers is connected to a power distribution input terminal of the test bench.

[0051] Specifically, in this embodiment, a 380 AC power distribution cabinet is used as the AC power source. After connecting the protection circuit and the disconnect switch through a three-phase five-wire wiring method, the first AC-DC converter, the second AC-DC converter, the return water pump motor, the cooling tower motor, the dynamometer hydraulic motor, the lubricating oil pump motor, the fuel seal pump heater, the fuel seal pump motor, and the emergency power source are connected to provide the total power output.

[0052] In the electrical connections of the AC power supply and the power input terminals of the return water pump motor, the cooling tower motor, the dynamometer hydraulic motor, the engine's lubricating oil pump motor, the engine's fuel seal pump heater, and the engine's fuel seal pump motor, a set of contactors and motor circuit breakers are respectively installed.

[0053] In principle, a motor circuit breaker is an electrical device used to protect a motor. Motor circuit breakers are usually used in conjunction with contactors. During testing, if the motor experiences a short circuit or undervoltage fault due to frequent starting or continuous disconnection during operation, the circuit breaker can automatically cut off the circuit to prevent damage to the motor.

[0054] In principle, the three-phase AC power output of an AC power supply has higher power transmission efficiency than the DC power output of a DC power supply, making it easier to achieve load balancing, reducing unbalanced current in the power system, and improving power supply stability and reliability. The three-phase five-wire connection method is suitable for various voltage application scenarios and can simultaneously provide 380V line voltage and 220V phase voltage, which can meet the different input voltage requirements of test benches and engines. In addition, the AC power supply also includes a protective grounding wire to prevent the casing of electrical equipment from becoming live and to ensure safety.

[0055] Generally, the generators on aircraft using turboshaft engines typically produce an initial DC voltage of 28V or an initial AC voltage of 115V for power supply.

[0056] In this embodiment, the 380V power distribution cabinet is connected to the first AC-DC converter as an AC power source. The first AC-DC converter outputs 270V DC power to power the engine fuel electric regulating pump. The 380V AC power is input to the second AC-DC converter, and the second AC-DC converter outputs 270V DC power to power the starter generator. Compared with the prior art, the wire diameter of the 270V DC power wiring is much smaller than that of the wires used in the commonly used 28V DC or 115V AC power in the prior art. This helps to reduce the space and overall weight of electrical wiring, making the electrical wiring structure simpler and easier to maintain. It also greatly reduces the difficulty of implementing electrical wiring in the limited space of an aircraft.

[0057] Preferably, the dynamometer is a hydraulic dynamometer that can meet the testing requirements of high-power engines.

[0058] The AC power supply is connected to the starter generator via the second AC-DC converter.

[0059] In principle, during testing, the engine is started to rotate. After the engine reaches the preset speed, the generator can also rotate and generate electricity.

[0060] Figure 2 The diagram shows the electrical schematic of the generator in this embodiment.

[0061] Table 1 below shows the electrical configuration parameters for starting the generator in this embodiment:

[0062]

[0063] Table 1: Electrical configuration parameters of the starter generator in this embodiment

[0064] Specifically, a starter generator includes a starter generator and a motor drive ( Figure 2 The generator (marked as starter generator drive) and the motor driver are connected via a motor cable, and the starter generator and the engine are mechanically connected. The starter generator is equipped with a rotary transformer for collecting the starter generator speed, and the starter generator speed signal collected by the rotary transformer is fed back to the starter generator drive. The starter generator drive is connected to a second AC-DC converter via contactor 2. The second AC-DC converter converts the 380V AC power generated by the AC power supply into 270V DC power, which is output to the starter generator through contactor 2. The starter generator is also connected to the resistive load of the test bench via contactor 1. The starter generator is also connected to the test bench controller via communication.

[0065] The specific working principle is as follows:

[0066] When the test bench is powered on, the test bench controller sends a start command to the starter generator, contactor 2 is turned on, and 380V AC power is output to the starter generator through the second AC-DC converter and the turned contactor 2. The starter generator starts to rotate and drives the engine to rotate synchronously. When the rotary transformer detects that the starter generator has reached the preset speed, it means that the engine has entered the autonomous rotation state. Then the test bench controller sends a command to the starter generator, the starter generator disconnects contactor 2 and turns on contactor 1. The engine drives the starter generator to rotate, and the power generated by the starter generator is sent to the resistive load of the test bench through contactor 1 for power consumption.

[0067] Preferably, the communication connection is an RS422 communication connection.

[0068] The starter generator can also be connected to the engine electronic controller via the DC 28V power converter.

[0069] In principle, when testing the engine, if the engine rotates autonomously and drives the starter generator to rotate, the starter generator can generate electricity autonomously, which is connected to the engine electronic controller through the DC 28V power converter, serving as a power supply redundancy configuration for the engine electronic controller.

[0070] Currently, the commonly used hydraulic starters and gas turbine starters start the engine and stop working after entering autonomous rotation, which has a single function. Using a starter generator to start the engine and generate electricity for power supply as the engine rotates is much more practical.

[0071] Preferably, in this embodiment, the starter generator is a 12kW dual-winding permanent magnet motor, wherein the permanent magnet of the permanent magnet motor is built-in to ensure the stability of the starter generator when operating at high speed.

[0072] Furthermore, the DC-DC conversion unit includes a 28V DC power converter, a first 24V DC power converter, and a 12V DC power converter;

[0073] The emergency power output terminal is connected to the power input terminal of the engine electronic controller via the DC 28V power converter; the emergency power output terminal is also connected to the power input terminal of the human-machine interface of the test bench via the first DC 24V power converter; the emergency power output terminal is also connected to the power input terminal of the test bench controller via the DC 12V power converter.

[0074] Furthermore, the emergency power supply is also connected to the power input terminal of the dynamometer controller in the test bench.

[0075] Furthermore, the electrical system also includes a data acquisition module and a sensor signal isolation unit;

[0076] The DC-DC conversion unit also includes a second 24V DC power converter;

[0077] The emergency power supply output terminal is also connected to the power distribution input terminal of the data acquisition module;

[0078] The emergency power output terminal is also connected to the power distribution input terminal of the sensor signal isolation unit through the second DC 24V power converter. The signal input terminal of the sensor signal isolation unit is connected to the sensor in the test bench or engine, and the output terminal is connected to the signal input terminal of the data acquisition module.

[0079] In principle, the engine electronic controller, test bench controller, data acquisition module, human-machine interface, sensor signal isolation unit, and dynamometer controller require a continuous power supply during testing to prevent test interruption and loss of test results due to sudden power failure. In this embodiment, the AC power supply outputs 380V AC power to charge the emergency power supply. The emergency power supply outputs 220V DC power, which is converted into corresponding output voltages by a DC-DC converter to power the engine electronic controller, test bench controller, human-machine interface, sensor signal isolation unit, and dynamometer controller. It also directly powers the data acquisition module, improving the power supply reliability of the test control devices.

[0080] Preferably, the emergency power supply is a UPS that outputs 220V DC power.

[0081] Furthermore, such as Figure 3 As shown, both the engine and the test bench are equipped with multiple sets of sensors;

[0082] The data acquisition module includes multiple data acquisition units; the sensor signal isolation unit includes multiple isolators; each data acquisition unit is connected to one isolator.

[0083] The data acquisition unit and the isolator are arranged in pairs near the corresponding sensors on the engine or test bench, wherein,

[0084] Each data acquisition unit's signal input terminal is connected to the corresponding isolator output terminal via a shielded cable;

[0085] Each isolator input is connected to the corresponding sensor signal output via a shielded cable.

[0086] Furthermore, the system also includes an industrial control computer; all data acquisition unit signal output terminals are connected to the signal input terminals of the industrial control computer via communication cables, and the industrial control computer is also connected to the test bench controller via communication cables.

[0087] Typically, during testing, multiple sets of sensors are installed on the engine and test bench to obtain engine operating status data and test process data. These sensors are distributed at different locations on the engine and test bench. Existing technology uses a centralized integrated data acquisition module connected to an integrated sensor isolation unit located in a fixed position. Because the sensors are scattered, complex wiring is required to connect the dispersed sensors to the integrated data acquisition unit and the integrated sensor isolation unit. Furthermore, even if the sensors have different acquisition frequencies, existing technology can only use the integrated data acquisition module with the highest frequency and configuration specifications. This not only easily leads to wasted data acquisition module resources, but also results in poor reliability if the data acquisition module fails, causing all sensor data to be unavailable. This embodiment uses a distributed data acquisition unit, such as... Figure 3 As shown, the distributed data acquisition unit is configured according to the acquisition requirements of each group of sensors, and then a corresponding distributed sensor signal isolator is configured. The signal output of each group of sensors is connected to the input of the corresponding sensor signal isolator via a twisted-pair or twisted-triple shielded cable. The output of the sensor signal isolator is connected to the signal input of the corresponding data acquisition unit via a twisted-pair shielded cable. Each data acquisition unit is connected to the industrial control computer via a communication cable. This setup and connection structure not only saves a significant amount of cabling and reduces wiring complexity and maintenance costs, but also allows for the adaptive selection of appropriate configurations and models for each group of sensors, improving overall reliability and reducing costs.

[0088] In one specific embodiment, the sensor wiring length is reduced from 10 meters to about 0.5 meters. Roughly estimated based on a test bench deploying 200 sensors, this can save approximately 3,000 meters of wiring cable.

[0089] In one specific embodiment, the cost of using distributed data acquisition units is estimated to be reduced by 30% compared to existing technologies.

[0090] Preferably, the industrial control computer includes a clock synchronization device to facilitate centralized control of each data acquisition unit.

[0091] This embodiment discloses an electrical system for a high-power turboshaft engine test bench. The test bench includes a dynamometer, a starter generator, an AC power supply, a test bench controller, a first AC-DC converter, a second AC-DC converter, and a DC-DC conversion unit. The output terminal of the AC power supply is connected to the power input terminal of the dynamometer in the test bench, and also to the input terminal of the emergency power supply and the input terminal of the first AC-DC converter. The output terminal of the first AC-DC converter is connected to the power input terminal of the fuel electric regulating pump in the engine. The output terminal of the AC power supply is also connected to the input terminal of the second AC-DC converter, and the output terminal of the second AC-DC converter is connected to the power input terminal of the starter generator in the test bench. Compared with the commonly used DC single-phase power supply in the prior art, the use of AC power supply has higher power transmission efficiency, facilitates load balancing, reduces unbalanced current, and improves power supply stability and reliability. The output terminal of the emergency power supply is connected to the input terminal of the DC-DC conversion unit. The DC-DC conversion unit's output is connected to the power input of the engine electronic controller and the power input of the test bench controller. An emergency power supply provides power to the engine electronic controller, test bench controller, dynamometer controller, test bench HMI, data acquisition module, and sensor isolation unit, ensuring continuous power supply in the event of a sudden main power outage, preventing test data loss, and improving test reliability and emergency response capabilities. The system also includes a data acquisition module and a sensor signal isolation unit. The data acquisition module comprises multiple data acquisition units, and the sensor signal isolation unit comprises multiple isolators. Each data acquisition unit is connected to one isolator and is positioned near the corresponding sensor on the engine or test bench. Shielded cables connect the data acquisition units and isolators, and the isolators and corresponding sensors. Compared to the integrated data acquisition module and integrated sensor signal isolation unit used in existing technologies, this significantly reduces cable usage, wiring complexity, and maintenance difficulty.

[0092] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0093] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electrical system for a high-power turboshaft engine test bench, characterized in that, The system includes an AC power supply, an emergency power supply, a first AC-DC converter, a second AC-DC converter, and a DC-DC conversion unit, wherein... The AC power output terminal is connected to the power input terminal of the dynamometer in the test bench, and is also connected to the emergency power input terminal and the input terminal of the first AC-DC converter. The output terminal of the first AC-DC converter is connected to the power input terminal of the fuel electric regulating pump in the engine. The output terminal of the AC power supply is also connected to the input terminal of the second AC-DC converter, and the output terminal of the second AC-DC converter is connected to the power distribution input terminal of the starter generator in the test bench. The emergency power supply output terminal is connected to the input terminal of the DC-DC conversion unit, and the output terminal of the DC-DC conversion unit is connected to the power distribution input terminal of the engine electronic controller and the power distribution input terminal of the test bench controller.

2. The electrical system for a high-power turboshaft engine test bench according to claim 1, characterized in that, The AC power supply is connected to the input terminals of the first AC-DC converter and the second AC-DC converter respectively via a three-phase five-wire connection.

3. The electrical system for a high-power turboshaft engine test bench according to claim 2, characterized in that, Both the first AC-DC converter and the second AC-DC converter are AC-DC converters with an output of DC270V.

4. The electrical system for a high-power turboshaft engine test bench according to claim 1, characterized in that, The DC-DC conversion unit includes a 28V DC power converter, a first 24V DC power converter, and a 12V DC power converter. The emergency power output terminal is connected to the power input terminal of the engine electronic controller via the DC 28V power converter; the emergency power output terminal is also connected to the power input terminal of the human-machine interface in the test bench via the first DC 24V power converter; the emergency power output terminal is also connected to the power input terminal of the test bench controller via the DC 12V power converter.

5. The electrical system for a high-power turboshaft engine test bench according to claim 4, characterized in that, The electrical system also includes a data acquisition module and a sensor signal isolation unit; The DC-DC conversion unit also includes a second 24V DC power converter; The emergency power supply output terminal is also connected to the power distribution input terminal of the data acquisition module; The emergency power output terminal is also connected to the power distribution input terminal of the sensor signal isolation unit through the second DC 24V power converter. The signal input terminal of the sensor signal isolation unit is connected to the sensor in the test bench or engine, and the output terminal is connected to the signal input terminal of the data acquisition module.

6. The electrical system for a high-power turboshaft engine test bench according to claim 5, characterized in that, The data acquisition module includes multiple data acquisition units; the sensor signal isolation unit includes multiple isolators; each data acquisition unit is connected to one isolator. The data acquisition unit and the isolator are arranged in pairs near the corresponding sensors on the engine or test bench, wherein, Each data acquisition unit's signal input terminal is connected to the corresponding isolator output terminal via a shielded cable; Each isolator input is connected to the corresponding sensor signal output via a shielded cable.

7. The electrical system for a high-power turboshaft engine test bench according to claim 6, characterized in that, The system also includes an industrial control computer; all data acquisition unit signal output terminals are connected to the signal input terminals of the industrial control computer via communication cables, and the industrial control computer is also connected to the test bench controller via communication cables.

8. The electrical system for a high-power turboshaft engine test bench according to claim 1, characterized in that, The emergency power supply is also connected to the power input terminal of the dynamometer controller in the test bench.

9. The electrical system for a high-power turboshaft engine test bench according to claim 1, characterized in that, The electrical system also includes multiple sets of contactors and motor circuit breakers; each set includes a contactor and a motor circuit breaker connected in series, the input terminal of each set of contactors is connected to the AC power output terminal, and the output terminal of each set of motor circuit breakers is connected to a power distribution input terminal of the test bench.

10. The electrical system for a high-power turboshaft engine test bench according to claim 1, characterized in that, The electrical system also includes a frequency converter, which is installed on the dynamometer; the AC power supply is connected to the power input terminal of the water pump motor of the dynamometer through the frequency converter.

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