Excitation shaft generator test board

Abstract

The utility model relates to the technical field of marine generator testing, in particular to an excitation shaft generator test board. The test board comprises a test board body, the test board body is provided with a first generator, an axle generator, a power supply module, a frequency converter, a PLC, a bus and a load module, the first generator, the axle generator and the load module are electrically connected with the bus, and the power supply module and a first switch are sequentially connected between the first generator and the bus. A frequency converter and a second switch are sequentially connected between the axle generator and the bus, a third switch is connected between the load module and the bus, and the PLC is electrically connected with the first switch, the second switch and the third switch. By integrating a plurality of devices on the testboard body, all-condition simulation of the whole machine test of the axle generator can be realized on the ground, a large amount of resource transfer and long-time preparation required by the boarding whole machine test are avoided, and the test cost of the axle generator is reduced.

Description

Technical Field

[0001] This utility model relates to the field of marine generator testing technology, specifically to a test bench for a generator driven by an excitation shaft. Background Technology

[0002] A magnetizing shaft generator is a power generation device used in ships. Driven by the ship's main engine, it converts electrical energy into power through shaft and belt transmission, thereby supplying electricity to the ship.

[0003] Currently, grid connection testing of excitation shaft generators on actual ships mainly relies on direct onboard testing of the entire unit. Although this testing method can provide the most realistic simulation of the working environment, testing on board requires the mobilization of a large amount of resources, such as onboard equipment, professional technicians, and the transportation and installation of testing equipment. This leads to long testing cycles and high costs, especially when multiple tests are conducted or test parameters are changed, the cost pressure becomes more obvious. Utility Model Content

[0004] This invention provides a test bench for excitation shaft-driven generators, which can overcome some or all the defects of the prior art.

[0005] According to the present invention, the excitation shaft-driven generator test bench includes a test bench body, a first generator, a shaft-driven generator, a power supply module, a frequency converter, a PLC, a bus, and a load module. The first generator, the shaft-driven generator, and the load module are electrically connected to the bus. The power supply module and a first switch are connected sequentially between the first generator and the bus. The frequency converter and a second switch are connected sequentially between the shaft-driven generator and the bus. The load module and a third switch are connected to the bus. The PLC is electrically connected to the first switch, the second switch, and the third switch.

[0006] In a preferred embodiment of this utility model, a direct drive branch connected to the load module is provided between the frequency converter and the second switch, and a fourth switch is provided at the direct drive branch.

[0007] In a preferred embodiment of this invention, the load module includes an adjustable resistor array.

[0008] In a preferred embodiment of this utility model, the test bench body is further provided with a human-machine interaction panel, which includes a touch screen, status indicator lights and operation buttons.

[0009] In a preferred embodiment of this utility model, a test protection module is also connected between the PLC and the load module. The test protection module integrates a reverse power relay, an overcurrent protector, and an undervoltage tripping device.

[0010] In a preferred embodiment of this utility model, a second generator is electrically connected to the bus, a fifth switch is connected between the second generator and the bus, and the fifth switch is electrically connected to the PLC.

[0011] In a preferred embodiment of this utility model, a third generator is electrically connected to the bus, a sixth switch is connected between the third generator and the bus, and the sixth switch is electrically connected to the PLC.

[0012] Beneficial effects:

[0013] By integrating the first generator, shaft-driven generator, power module, frequency converter, PLC, bus, and load module onto the test bench, full-condition simulation of the shaft-driven generator can be achieved on the ground, avoiding the large amount of resource mobilization and long preparation time required for onboard testing.

[0014] Furthermore, by controlling the corresponding switches sequentially through the PLC, the shaft-driven generator and the first generator (and the second and third generators under specific conditions) can be connected to the grid for output. This enables accurate simulation of grid connection and emergency switching between generators on a ship, further reducing the cost pressure caused by multiple tests or parameter changes.

[0015] In addition, the test protection module integrates protection modules such as reverse power relay, overcurrent protector and undervoltage trip device, which greatly improves the safety of the excitation shaft generator test bench during use. Attached Figure Description

[0016] Figure 1 A structural block diagram of an excitation shaft-driven generator test bench provided in at least one embodiment of this utility model;

[0017] Figure 2 This is a partial circuit connection diagram of the excitation shaft-driven generator test bench provided in at least one embodiment of the present invention;

[0018] Figure 3 This is a block diagram of the human-computer interaction panel structure provided in at least one embodiment of the present invention;

[0019] Figure 4 This is a structural block diagram of a test protection module provided in at least one embodiment of the present invention. Detailed Implementation

[0020] Seen in Figure 1-4This embodiment provides a test bench for an excitation shaft-driven generator, which includes a test bench body 1. The test bench body 1 is equipped with a first generator, a shaft-driven generator, a power supply module, a frequency converter, a PLC, a bus, and a load module. The shaft-driven generator is the device to be tested. The first generator is used as a reference for the power grid to be connected to the grid. The power supply module is used to stabilize and regulate the current generated by the first generator to provide a stable output current. The frequency converter is used to adjust the output frequency of the shaft-driven generator to simulate different speed conditions.

[0021] The first generator, the shaft-driven generator, and the load module are electrically connected to the bus. The first generator is connected to the bus via a power module and a first switch 2. The shaft-driven generator is connected to the bus via a frequency converter and a second switch 3. The load module is connected to the bus via a third switch 4. The PLC is electrically connected to the first switch 2, the second switch 3, and the third switch 4. A direct drive branch 5 connected to the load module is provided between the frequency converter and the second switch 3. A fourth switch 6 is provided at the direct drive branch 5.

[0022] Understandably, the load module includes an adjustable resistor array, which can simulate dynamic load changes and adjust active or reactive power. The PLC manages the switch status, load distribution, and test logic through a bus protocol, thereby realizing automatic control of the excitation shaft-driven generator test bench.

[0023] Specifically, when testing a shaft-driven generator, the PLC can execute automatic programs to perform direct-drive tests, stand-alone tests, and grid-connected tests on the shaft-driven generator.

[0024] During direct drive testing, the PLC controls the fourth switch 6 to close, and the starting shaft drives the generator to directly drive the load for pure mechanical characteristic testing without frequency converter intervention.

[0025] During stand-alone testing, the PLC controls the second switch 3 to close, starting the shaft-driven generator. The output is then regulated to the bus via the frequency converter. Afterward, a preset resistance value is applied to the load module to verify voltage / frequency stability.

[0026] During grid connection testing, the first generator and the shaft-driven generator are started. The PLC controls the first switch 2 to close first, and then controls the second switch 3 to close, so that the first generator and the shaft-driven generator can be connected to the grid and output to the bus. Then, the load module applies a preset resistance value to verify the voltage / frequency stability. This step can simulate the operation of the generator and the shaft-driven generator on the ship to be connected to the grid without having to perform the simulation on the ship, which greatly reduces the testing cost.

[0027] In some embodiments, a test protection module is also connected between the PLC and the load module. The test protection module integrates a reverse power relay, an overcurrent protector, and an undervoltage tripping device.

[0028] Among them, the reverse power relay is used to monitor the reverse power flow of all generators. If a generator absorbs more than 10% of the power from other generators for 10 seconds, the grid-connected switch of that generator will trip to protect the grid-connected circuit.

[0029] Furthermore, the overcurrent protector is used to monitor the current of all generators. If the current of a generator exceeds 135% of the rated current, the grid-connected switch for that generator will trip after a delay of 15 to 40 seconds. If the current of a generator exceeds 250% of the rated current, the grid-connected switch for that generator will trip after a delay of 400 ms. If the current of a generator exceeds 10 times the rated current, the grid-connected switch for that generator will trip instantaneously.

[0030] Furthermore, the undervoltage release device monitors the voltage of all generators. When the voltage of a generator falls below 35% to 70% of its rated voltage, the undervoltage release device activates after a delay of 0.3 to 0.5 seconds, controlling the grid-connected switch of that generator to trip. This delay is to prevent instantaneous voltage fluctuations from causing abnormal tripping of the generator.

[0031] In some embodiments, the test bench body 1 is further provided with a human-machine interaction panel, which includes a touch screen, status indicator lights and operation buttons.

[0032] The human-machine interface panel enables visual operation of the shaft-driven generator test bench. The touchscreen displays test information and the status of each generator. Users can control the operation of each generator and the on / off status of each switch via touch. Status indicator lights directly reflect the key status of the test bench and main distribution board, such as operating status, equipment status, or protection status. The indicator lights can be displayed in levels, such as green for normal status, yellow for warning status, and red for fault status. The operation buttons provide redundant operation channels to ensure that critical operations can still be performed in case of touchscreen failure or emergency.

[0033] In some embodiments, a second generator is electrically connected to the bus, and a fifth switch 7 is connected between the second generator and the bus. The fifth switch 7 is electrically connected to the PLC. By setting up the second generator, the emergency grid connection state of the second generator when the first generator fails can be simulated, which is more in line with the actual operating state of the ship.

[0034] In some embodiments, a third generator is also electrically connected to the bus, and a sixth switch 8 is connected between the third generator and the bus. The sixth switch 8 is electrically connected to the PLC. Since some ships have more than one generator, setting up a third generator can simulate a ship with multiple generators for testing.

[0035] It is readily understood that those skilled in the art can combine, split, or reorganize the embodiments provided in this application to obtain other embodiments, all of which do not exceed the protection scope of this application.

Claims

1. A field shaft generator test bench, characterized in that, The test bench body is provided with a first generator, a shaft generator, a power module, a frequency converter, a PLC, a bus and a load module. The first generator, the shaft generator and the load module are electrically connected with the bus. The first generator is connected with the bus through the power module and a first switch. The shaft generator is connected with the bus through the frequency converter and a second switch. The load module is connected with the bus through a third switch. The PLC is electrically connected with the first switch, the second switch and the third switch.

2. The field shaft generator test bench of claim 1, wherein, A direct drive branch connected with the load module is arranged between the frequency converter and the second switch. The direct drive branch is provided with a fourth switch.

3. The field shaft generator test bench of claim 1, wherein, The load module comprises an adjustable resistance array.

4. The field shaft generator test bench of claim 1, wherein, The test bench body is further provided with a human-computer interaction panel comprising a touch screen, a state indicator lamp and an operation button.

5. The field shaft generator test bench of claim 1, wherein, The PLC and the load module are further connected with a test protection module. The test protection module is integrated with a reverse power relay, an overcurrent protector and an under-voltage tripping device.

6. The field shaft generator test bench of claim 1, wherein, The bus is further electrically connected with a second generator. The second generator is connected with the bus through a fifth switch. The fifth switch is electrically connected with the PLC.

7. The field shaft generator test bench of claim 1, wherein, The bus is further electrically connected with a third generator. The third generator is connected with the bus through a sixth switch. The sixth switch is electrically connected with the PLC.

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