Wind power generator frequency converter grid-connected simulation test platform

Abstract

The utility model discloses a wind driven generator frequency converter grid connection simulation test board relates to frequency converter grid connection simulation test board technical field, and its technical key points include frame, the top surface mounting of frame has testing appearance, the outside installation of testing appearance has interface group, the bottom surface mounting of frame has removal subassembly, the utility model discloses when using, realized through adjustable shock absorber subassembly and interval adjusting mechanism, and the damping spring pre -tensioning force can be adjusted to rotate the rocker, and the matching hydraulic adjustable damper can adapt to different weight frequency converter, avoid the problem that high -power model vibration causes wiring loose, low -power model low -frequency vibration is difficult to absorb, and the convenient movement and stable fixation of test board are realized relying on removal subassembly, and different size frequency converter is clamped quickly and stably with the help of V -shaped clamping cover and second electric push rod, and the vibration is monitored in real time in combination with piezoelectric acceleration sensor, guarantees the accurate test data, reduces the equipment loss, and improves test stability and efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of frequency converter grid connection simulation test bench, specifically a wind turbine frequency converter grid connection simulation test bench. Background Technology

[0002] The frequency converter of a wind turbine is a core component of a wind power generation system, and its grid connection performance (such as synchronization accuracy, harmonic suppression, and fault ride-through capability) directly affects the stability of the wind power system. Before leaving the factory, the frequency converter must be verified for its performance using a grid connection simulation test bench.

[0003] Current mainstream inverter grid-connected simulation test benches mostly use fixed-stiffness springs or rubber pads for vibration damping, which cannot be dynamically adjusted according to the weight differences of inverters with different power ratings. For high-power inverters, the fixed vibration damping structure is not stiff enough, which can easily cause the wiring between the inverter and the test bench to loosen due to vibration, and even cause poor contact of high-voltage terminals, resulting in measurement deviations of key parameters such as grid-connected current and harmonic distortion rate. For low-power inverters, the stiffness is too excessive, which cannot effectively absorb the low-frequency vibrations generated by the operation of the inverter fan and internal components. Long-term use may also aggravate the fatigue wear of components such as inverter IGBT modules and capacitors. Therefore, it is necessary to redesign the wind turbine inverter grid-connected simulation test bench to address the above problems. Utility Model Content

[0004] One technical problem to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a grid-connected simulation test bench for wind turbine generator frequency converters. It solves the problems of existing test benches having fixed vibration damping structure stiffness, being unable to adapt to the weight differences of frequency converters with different power ratings, resulting in poor vibration control, large deviations in test data, and increased equipment wear.

[0006] The problem.

[0007] Two technical solutions

[0008] To achieve the above objectives, this utility model provides the following technical solution: a wind turbine inverter grid-connected simulation test bench, comprising a frame, a test instrument mounted on the top surface of the frame, an interface group mounted on the outer side of the test instrument, a moving component mounted on the bottom surface of the frame, a moving plate slidably connected to the top surface of the frame via multiple electric linear guides, an assembly plate mounted on the top surface of the moving plate via an adjustable shock-absorbing component, a clamping component mounted on the top surface of the assembly plate, the adjustable shock-absorbing component comprising two fixed plates, the two fixed plates being symmetrically mounted on the top surface of the moving plate, multiple fixed rods being jointly mounted on the two fixed plates, two sliding sleeves being symmetrically slidably connected to the outer side of each fixed rod, a connecting rod being rotatably connected to the top surface of each sliding sleeve, and each connecting rod being rotatably connected to the bottom surface of the assembly plate, a shock-absorbing spring being jointly mounted between every two corresponding sliding sleeves, and two threaded sleeves being slidably connected to the multiple fixed rods, each threaded sleeve abutting against one side of the corresponding sliding sleeve, the moving plate driving the two threaded sleeves to slide towards each other via a spacing adjustment mechanism.

[0009] Preferably, the spacing adjustment mechanism includes a double-ended screw, with both ends of the double-ended screw rotatably connected to the outer side of the corresponding fixed plate, and two threaded sleeves symmetrically threaded to the outer side of the double-ended screw. One end of the double-ended screw passes through the corresponding fixed plate and is equipped with a rocker arm.

[0010] Preferably, the moving component includes multiple casters, which are symmetrically mounted on the bottom surface of the frame. Two first electric push rods are symmetrically mounted on the bottom surface of the frame, and a bearing plate is fixedly mounted on the bottom end of each first electric push rod.

[0011] Preferably, multiple side plates are symmetrically installed on both outer sides of the assembly plate and the movable plate, and the multiple side plates on the movable plate and the assembly plate correspond one-to-one. A hydraulically adjustable damper is installed between every two corresponding side plates.

[0012] Preferably, the clamping assembly includes two support plates, which are symmetrically mounted on the top surface of the assembly plate. Multiple second electric push rods are symmetrically mounted on the outer side of each support plate. The other ends of the multiple second electric push rods located on the same side are all equipped with clamping sleeves, and each clamping sleeve is V-shaped.

[0013] Preferably, multiple rotating seats are symmetrically mounted on the bottom surface of the assembly plate, and each rotating seat is rotatably connected to the top of the corresponding connecting rod. Two piezoelectric acceleration sensors are symmetrically mounted on the bottom surface of the assembly plate.

[0014] Three beneficial effects

[0015] Compared with the prior art, this utility model provides a grid-connected simulation test bench for wind turbine frequency converters, which has the following advantages:

[0016] 1. This utility model achieves dynamic vibration damping adaptation for frequency converters of different weights through devices such as a movable plate, adjustable damping components, and a spacing adjustment mechanism. Rotating the rocker arm of the spacing adjustment mechanism can drive the threaded sleeve to slide, pushing the sliding sleeve to compress or stretch the damping spring, flexibly adjusting the spring preload. Combined with the hydraulic adjustable damper to assist in vibration suppression, it effectively avoids loose wiring caused by the vibration of high-power frequency converters, while accurately absorbing the low-frequency vibration of low-power frequency converters, ensuring the accuracy of test data and reducing equipment fatigue wear.

[0017] 2. This utility model achieves convenient movement and stable fixation of the test bench through devices such as a moving component, a clamping component, and a piezoelectric accelerometer, as well as efficient adaptation and clamping of the frequency converter and real-time vibration monitoring. The casters facilitate the movement of the test bench, the first electric push rod cooperates with the bearing plate to achieve stable fixation, the clamping sleeve and the second electric push rod are adapted to frequency converters of different sizes to quickly complete stable clamping, and the piezoelectric accelerometer monitors vibration parameters in real time, allowing operators to adjust the vibration damping components in a timely manner, further improving the stability and efficiency of the test. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the grid-connected simulation test bench for wind turbine frequency converters proposed in this utility model;

[0019] Figure 2 This is a schematic diagram of the hydraulic adjustable damper installation structure of the wind turbine frequency converter grid connection simulation test bench proposed in this utility model.

[0020] Figure 3 This is a schematic diagram of the clamping assembly structure of the grid-connected simulation test bench for wind turbine frequency converters proposed in this utility model.

[0021] Figure 4 This is a schematic diagram of the spacing adjustment mechanism of the grid-connected simulation test bench for wind turbine frequency converters proposed in this utility model.

[0022] In the diagram: 1. Frame; 2. Tester; 3. Interface group; 4. Casters; 5. First electric push rod; 6. Bearing plate; 7. Electric linear guide; 8. Moving plate; 9. Assembly plate; 10. Side plate; 11. Hydraulic adjustable damper; 12. Piezoelectric accelerometer; 13. Fixing plate; 14. Fixing rod; 15. Support plate; 16. Second electric push rod; 17. Clamping sleeve; 18. Sliding sleeve; 19. Rotating seat; 20. Connecting rod; 21. Shock-absorbing spring; 22. Double-ended screw; 23. Threaded sleeve; 24. Rocker arm. Detailed Implementation

[0023] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0024] This utility model provides a technical solution for a grid-connected simulation test bench for wind turbine frequency converters:

[0025] Please see Figures 1-4 A wind turbine inverter grid-connected simulation test bench includes a frame 1. A test instrument 2 is mounted on the top surface of the frame 1, and an interface group 3 is mounted on the outside of the test instrument 2. A moving component is mounted on the bottom surface of the frame 1. A moving plate 8 is slidably connected to the top surface of the frame 1 via multiple electric linear guides 7. An assembly plate 9 is mounted on the top surface of the moving plate 8 via an adjustable damping component. A clamping component is mounted on the top surface of the assembly plate 9. The adjustable damping component includes two fixed plates 13, which are symmetrically mounted on the top surface of the moving plate 8. The two fixed plates 13 together... Multiple fixed rods 14 are installed, and two sliding sleeves 18 are symmetrically slidably connected to the outer side of each fixed rod 14. A connecting rod 20 is rotatably connected to the top surface of each sliding sleeve 18, and each connecting rod 20 is rotatably connected to the bottom surface of the mounting plate 9. A shock-absorbing spring 21 is installed between every two corresponding sliding sleeves 18. Two threaded sleeves 23 are slidably connected to the multiple fixed rods 14, and each threaded sleeve 23 abuts against one side of the corresponding sliding sleeve 18. The moving plate 8 drives the two threaded sleeves 23 to slide towards each other through the spacing adjustment mechanism.

[0026] It should be noted that Tester 2 is a dedicated test device for grid connection simulation of wind turbine generator frequency converters. It contains four core modules: the grid simulation module can output suitable voltage and frequency and simulate grid fault conditions such as voltage drop and three-phase imbalance; the power measurement module can collect and measure key electrical parameters such as grid voltage, current, power and harmonic distortion rate in real time; the control module is the core, with built-in grid connection control algorithm, communicates with the frequency converter through the interface, sends commands and receives status feedback; the data storage and interaction module is responsible for displaying test data in real time, storing historical records and supporting communication with the host computer. During operation, the control module drives the grid simulation module to generate target operating conditions, the power measurement module collects and analyzes parameters synchronously, and the data module displays and stores data synchronously to complete the grid connection performance test of the frequency converter.

[0027] Furthermore, the tester 2 has an integrated interface group 3 on its outer side. The interface group 3 includes a high-voltage power interface, a low-voltage control interface, and a data acquisition interface, which are used to connect to the power supply terminal, control terminal, and signal output terminal of the frequency converter, respectively.

[0028] The slider of the electric linear guide 7 is bolted to the bottom surface of the moving plate 8. The electric linear guide 7 can drive the moving plate 8 to slide in the horizontal direction, adjust the distance between the moving plate 8 and the tester 2, and facilitate the docking of the frequency converter and the interface group 3. The electric linear guide 7 also has a limit function to ensure that the position of the moving plate 8 is fixed.

[0029] Furthermore, the spacing adjustment mechanism includes a double-ended screw 22, and the two ends of the double-ended screw 22 are respectively rotatably connected to the outside of the corresponding fixed plate 13, and two threaded sleeves 23 are symmetrically threaded to the outside of the double-ended screw 22. One end of the double-ended screw 22 passes through the corresponding fixed plate 13 and is equipped with a rocker arm 24.

[0030] Rotating the rocker arm 24 can drive the double-headed screw 22 to rotate, which in turn drives the two threaded sleeves 23 to slide in opposite directions along the fixed rod 14, thereby pushing the sliding sleeve 18 to compress or stretch the damping spring 21, adjusting the preload of the damping spring 21 to adapt to frequency converters of different weights.

[0031] Furthermore, the moving component includes multiple casters 4, which are symmetrically mounted on the bottom surface of the frame 1 for easy movement and temporary fixation. Two first electric push rods 5 are symmetrically mounted on the bottom surface of the frame 1, and a bearing plate 6 is fixedly mounted on the bottom end of each first electric push rod 5.

[0032] The bottom surface of the support plate 6 is covered with a rubber anti-slip pad. When the first electric push rod 5 extends, the support plate 6 contacts the ground and lifts the frame 1, causing the casters 4 to leave the ground and achieve stable fixation of the test platform.

[0033] Furthermore, multiple side plates 10 are symmetrically installed on both outer sides of the assembly plate 9 and the movable plate 8, and the multiple side plates 10 on the movable plate 8 and the assembly plate 9 correspond one-to-one. A hydraulically adjustable damper 11 is installed between each pair of corresponding side plates 10. The damping coefficient of the hydraulically adjustable damper 11 can be adjusted by adjusting the valve, which helps the shock absorber spring 21 to suppress vibration and improve the shock absorption effect.

[0034] Furthermore, the clamping assembly includes two support plates 15, which are symmetrically mounted on the top surface of the assembly plate 9. Multiple second electric push rods 16 are symmetrically mounted on the outer side of each support plate 15. The other ends of the multiple second electric push rods 16 located on the same side are all mounted with clamping sleeves 17, and each clamping sleeve 17 is V-shaped.

[0035] The V-shaped clamping sleeve 17 can fit the inverter housing of different cross-sectional sizes. When the second electric push rod 16 extends or retracts, it can drive the clamping sleeve 17 to clamp or release the inverter, thereby achieving stable fixation of the inverter.

[0036] Furthermore, multiple rotating seats 19 are symmetrically installed on the bottom surface of the assembly plate 9, and each rotating seat 19 is rotatably connected to the top of the corresponding connecting rod 20. Two piezoelectric acceleration sensors 12 are symmetrically installed on the bottom surface of the assembly plate 9. The piezoelectric acceleration sensors 12 are connected to an external data acquisition instrument through wires, which can monitor the vibration amplitude and frequency of the assembly plate 9 in real time, making it convenient for operators to adjust the parameters of the shock absorption components.

[0037] In practical use, the working principle of this utility model is as follows:

[0038] First, the test platform is pushed to the target test area using the casters 4 on the bottom of the frame 1. During the pushing process, the position can be adjusted by the flexible steering of the casters. After reaching the designated location, the two first electric push rods 5 are activated, causing the support plate 6 at the bottom to extend downwards and make close contact with the ground. As the first electric push rods 5 continue to extend, the frame 1 is gradually lifted until the casters 4 are completely off the ground. The rubber anti-slip pads on the bottom of the support plate 6 enhance the friction with the ground, thereby achieving stable fixation of the test platform and preventing displacement during testing.

[0039] Next, based on the weight of the wind turbine inverter to be tested, the rocker arm 24 in the adjustable damping assembly is rotated, which drives the double-ended screw 22 to rotate. Since the two threaded sleeves 23 are symmetrically threaded on the outside of the double-ended screw 22, when the double-ended screw 22 rotates, it will drive the two threaded sleeves 23 to slide in opposite directions along the fixed rod 14, thereby pushing the sliding sleeve 18 to compress or stretch the damping spring 21, adjusting the preload of the damping spring 21, and adjusting the damping coefficient of the hydraulic adjustable damper 11 according to actual needs, in order to prepare for subsequent damping.

[0040] Subsequently, the inverter is placed in the center of the top surface of the assembly plate 9, and the second electric push rod 16 in the clamping assembly is activated. The second electric push rod 16 extends and retracts, causing the V-shaped clamping sleeve 17 to move closer to the inverter until the clamping sleeve 17 is tightly fitted with the inverter housing. The V-shaped structure is used to adapt to inverters with different cross-sectional sizes, so as to achieve stable clamping of the inverter.

[0041] Next, start the electric linear guide 7. Its slider drives the moving plate 8 to move horizontally toward the tester 2. When it moves to a suitable position, the inverter terminal is aligned with the interface group 3. The electric linear guide 7 fixes the position of the moving plate 8 through its built-in limit function. Then connect the power supply terminal, control terminal, and signal output terminal of the inverter to the high voltage power interface, low voltage control interface, and data acquisition interface of the interface group 3 respectively.

[0042] Finally, the tester 2 is started to test the frequency converter. At the same time, the vibration is monitored by the piezoelectric accelerometer 12 on the bottom of the assembly plate 9. If the vibration exceeds the standard, the parameters of the vibration damping components are adjusted in time to ensure the stable test of the frequency converter's grid connection performance is completed.

[0043] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A grid-connected simulation test bench for wind turbine frequency converters, comprising a frame (1), characterized in that, A tester (2) is mounted on the top surface of the frame (1), and an interface group (3) is mounted on the outside of the tester (2). A moving component is mounted on the bottom surface of the frame (1). A moving plate (8) is slidably connected to the top surface of the frame (1) via multiple electric linear guides (7). An assembly plate (9) is mounted on the top surface of the moving plate (8) via an adjustable shock-absorbing component. A clamping component is mounted on the top surface of the assembly plate (9). The adjustable shock-absorbing component includes two fixed plates (13), and the two fixed plates (13) are symmetrically mounted on the top surface of the moving plate (8). Multiple fixing rods are mounted on the two fixed plates (13). (14) Two sliding sleeves (18) are symmetrically slidably connected to the outer side of each fixed rod (14). A connecting rod (20) is rotatably connected to the top surface of each sliding sleeve (18). Each connecting rod (20) is rotatably connected to the bottom surface of the mounting plate (9). A shock-absorbing spring (21) is installed between each pair of corresponding sliding sleeves (18). Two threaded sleeves (23) are slidably connected to multiple fixed rods (14). Each threaded sleeve (23) abuts against one side of the corresponding sliding sleeve (18). The moving plate (8) drives the two threaded sleeves (23) to slide towards each other through the spacing adjustment mechanism.

2. The wind turbine generator frequency converter grid-connected simulation test bench according to claim 1, characterized in that, The spacing adjustment mechanism includes a double-ended screw (22), and the two ends of the double-ended screw (22) are rotatably connected to the outside of the corresponding fixed plate (13), and two threaded sleeves (23) are symmetrically threaded to the outside of the double-ended screw (22). One end of the double-ended screw (22) passes through the corresponding fixed plate (13) and is equipped with a rocker arm (24).

3. The wind turbine generator frequency converter grid-connected simulation test bench according to claim 2, characterized in that, The moving component includes multiple casters (4), and the multiple casters (4) are symmetrically installed on the bottom surface of the frame (1). Two first electric push rods (5) are symmetrically installed on the bottom surface of the frame (1), and a bearing plate (6) is fixedly installed at the bottom end of each first electric push rod (5).

4. The wind turbine frequency converter grid-connected simulation test bench according to claim 3, characterized in that, Multiple side plates (10) are symmetrically installed on both sides of the assembly plate (9) and the moving plate (8), and the multiple side plates (10) on the moving plate (8) and the assembly plate (9) correspond one-to-one. A hydraulically adjustable damper (11) is installed between each pair of corresponding side plates (10).

5. The wind turbine generator frequency converter grid-connected simulation test bench according to claim 4, characterized in that, The clamping assembly includes two support plates (15), and the two support plates (15) are symmetrically installed on the top surface of the assembly plate (9). Multiple second electric push rods (16) are symmetrically installed on the outer side of each support plate (15). The other end of the multiple second electric push rods (16) located on the same side is jointly installed with a clamping sleeve (17), and each clamping sleeve (17) is V-shaped.

6. The wind turbine generator frequency converter grid-connected simulation test bench according to claim 5, characterized in that, The bottom surface of the assembly plate (9) is symmetrically equipped with multiple rotating seats (19), and each rotating seat (19) is rotatably connected to the top of the corresponding connecting rod (20). The bottom surface of the assembly plate (9) is symmetrically equipped with two piezoelectric acceleration sensors (12).

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