High-voltage ride-through test equipment for wind generating set

Abstract

The utility model provides a wind generating set high voltage ride through test device comprising a test box body, two ends of the test box body are respectively connected with a connecting lead, and the tail end of the connecting lead is provided with a fixing assembly; a test circuit board and a super capacitor module are arranged in the test box body, a display screen is arranged at the top of the test box body, a protective shell is arranged on the outer side of the display screen, and the test circuit board can be connected between a tested wind turbine generator and a power grid through connecting wires at the two ends. The test circuit board is provided with a current limiting reactor group, a parallel capacitor group, a thyristor and a plurality of groups of circuit breakers, and the super capacitor module is connected with a direct current bus of the tested wind turbine generator. The test equipment can solve the problems of poor connection stability, inaccurate voltage simulation and low test automation degree in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation technology, and in particular to a high voltage ride-through testing device for wind turbine generator sets. Background Technology

[0002] As the scale of wind power grid connection expands, its proportion in the power system continues to increase, making high voltage ride-through capability a key indicator for wind turbines. High voltage ride-through, or HVRT, refers to the ability of a wind turbine to maintain grid connection and not unexpectedly disconnect from the grid due to overvoltage protection when the grid voltage temporarily exceeds a certain specified percentage of the rated voltage for some reason, thus ensuring the continuous and stable operation of the power grid.

[0003] Existing high voltage ride-through testing equipment has the following problems:

[0004] 1. Poor connection stability: The connection between the test equipment and the wind turbine is prone to loosening, which may lead to test interruption or safety accidents;

[0005] 2. Insufficient simulation accuracy: Existing technologies mostly use simple capacitors or reactors to simulate voltage regulation, with simple control logic, making it difficult to truly reflect the dynamic fault characteristics of the power grid;

[0006] 3. Low level of automation: It relies on manual operation and cannot adapt to the needs of automatic testing under multiple working conditions and parameters.

[0007] Therefore, there is an urgent need for a high-voltage ride-through testing device for wind turbine generators to solve the above-mentioned technical problems. Utility Model Content

[0008] The purpose of this invention is to provide a high voltage ride-through test device for wind turbine generator sets, which can solve the problems of poor connection stability, inaccurate voltage simulation and low degree of automation in existing technologies.

[0009] This utility model provides a high voltage ride-through test device for wind turbine generator sets, including: a test box, with connecting wires connected to both ends of the test box, and a fixing component provided at the end of the connecting wires;

[0010] The test chamber contains a test circuit board and a supercapacitor module. A display screen is located on the top of the test chamber, and a protective shell is installed on the outside of the display screen. The test circuit board can be connected to the wind turbine under test and the power grid through the connecting wires at both ends. The test circuit board is equipped with a current-limiting reactor group, a parallel capacitor group, thyristors, and multiple circuit breakers. The supercapacitor module is connected to the DC bus of the wind turbine under test.

[0011] Preferably, the test circuit board is provided with a main detection circuit and a branch detection circuit. The current-limiting reactor is connected to the main detection circuit, the thyristor and the parallel capacitor are connected to the branch detection circuit, one end of the branch detection circuit is connected to the main detection circuit, and the circuit breaker is provided at both ends of the main detection circuit.

[0012] Preferably, a transformer is connected between the power grid and the test circuit board.

[0013] Preferably, it also includes a non-detection bypass, on which the circuit breaker is connected.

[0014] Preferably, the supercapacitor module is connected to the DC bus of the wind turbine under test via a bidirectional converter.

[0015] Preferably, the test chamber is further equipped with an intelligent monitoring module, which is used to collect the voltage, current and power data of the wind turbine under test in real time, and the display screen is used to display the collected voltage, current and power data.

[0016] Preferably, the bottom of the test chamber is provided with four wheels.

[0017] Preferably, a handrail is provided at one end of the test chamber.

[0018] Preferably, the fixing assembly includes a detachably connected upper box and a lower box, with a wire passage hole formed between the upper box and the lower box. A positioning member is provided in the middle of the lower box, and the positioning member is electrically connected to the connecting wire. A fixing member is provided in the middle of the upper box, which cooperates with the positioning member to clamp the cable. The upper box is detachably connected to the lower box through an adjusting screw passing through it.

[0019] Preferably, the positioning element is a semi-circular ring, and the fixing element is a serrated element.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. By connecting the supercapacitor module to the DC bus, it can absorb or release instantaneous power, improve the voltage regulation response speed, and utilize the parallel capacitor bank and the supercapacitor module for coordinated control, which can accurately simulate the characteristics of grid voltage surge and fluctuation, and ensure the accuracy of test results.

[0022] 2. By setting up a display screen, the results of various parameters obtained from the automated testing of the test chamber can be clearly displayed, which is convenient for observation and recording, thereby judging the high voltage ride-through capability of the wind turbine.

[0023] 3. Strong connection stability, avoiding test interruption or safety accidents caused by loose connections during testing. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of the fixing component in this utility model;

[0027] Figure 3 This is a schematic diagram of the internal circuit connection of the test chamber of this utility model;

[0028] Explanation of reference numerals in the attached figures:

[0029] 1: Test housing; 2: Connecting wires; 3: Fixing components; 301: Upper housing; 302: Lower housing; 303: Wire passage hole; 304: Positioning component; 305: Fixing component; 306: Adjusting screw; 4: Test circuit board; 401: Main detection circuit; 402: Branch detection circuit; 403: Non-detection bypass circuit; 5: Supercapacitor module; 6: Display screen; 7: Protective shell; 8: Transformer; 9: Bidirectional converter; 10: Wheels; 11: Handrail; 12: Placement area. Detailed Implementation

[0030] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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 utility model.

[0032] Furthermore, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] like Figure 1-3 As shown, this embodiment provides a high voltage ride-through test device for wind turbine generator sets, including: a test box 1, with connecting wires 2 connected to both ends of the test box 1, and fixing components 3 respectively installed at the ends of the two connecting wires 2; a test circuit board 4 and a supercapacitor module 5 are installed inside the test box 1, and a display screen 6 is installed on the top of the test box 1, with a protective shell 7 sealingly fitted to the display screen 6 on the outside; the test circuit board 4 can be connected to the wind turbine generator set under test and the power grid through the connecting wires at both ends; the test circuit board 4 is equipped with a current-limiting reactor group X1, a parallel capacitor group C1, a thyristor T and multiple circuit breakers, wherein the current-limiting reactor group X1 is connected to the side closer to the power grid to limit the inrush current, high-order harmonics and short-circuit fault current in the system; the parallel capacitor group C1 is dynamically simulated to simulate the grid voltage by adjusting the input amount; the supercapacitor module 5 is connected to the DC bus of the wind turbine generator set under test to absorb or release instantaneous power and improve the voltage regulation response speed.

[0034] Specifically, the test circuit board 4 is provided with a main detection circuit 401 and a detection branch circuit 402. The current-limiting reactor group X1 is connected to the main detection circuit 401, and the thyristor T and the parallel capacitor group C1 are connected to the test point on the detection branch circuit 402. One end of the detection branch circuit 402 is connected to the main detection circuit 401. The two ends of the main detection circuit 401 are respectively provided with a first circuit breaker CB1 and a second circuit breaker CB2. When both the first circuit breaker CB1 and the second circuit breaker CB2 are closed, it can be used to test the high voltage ride-through capability of the wind turbine generator set.

[0035] In this embodiment, a transformer 8 is connected between the power grid and the test circuit board 4. A non-detection bypass 403 is also provided on the test circuit board 4 between the transformer 8 and the wind turbine. A third circuit breaker CB3 is connected to the non-detection bypass 403. After the test is completed, the first circuit breaker CB1 and the second circuit breaker CB2 can be disconnected, while the third circuit breaker CB3 remains closed, so that the wind turbine can maintain normal grid connection.

[0036] In this embodiment, the supercapacitor module 5 is connected to the DC bus of the wind turbine under test through a bidirectional converter 9. The bidirectional converter 9 can control the charging and discharging of the supercapacitor module 5 to achieve dynamic balance of the DC bus voltage.

[0037] The test chamber 1 is also equipped with an intelligent monitoring module, which is used to collect the voltage, current and power data of the wind turbine under test in real time, compare them with the preset threshold, and automatically trigger different test conditions. The display screen 6 is used to display the collected voltage, current and power data.

[0038] When a wind turbine is operating normally, its terminal voltage is at its rated voltage. When the series reactor is connected, the short-circuit capacity of the power grid decreases. Then, a parallel capacitor bank is connected, raising the terminal voltage. The increase in voltage is related to the capacity of the connected parallel capacitors. The purpose of the high-voltage ride-through test is to check whether the wind turbine can operate normally after the terminal voltage is raised (the time for this raising is specified in the power grid standards of different countries, and these standards vary). If the turbine can operate normally under various fault conditions within the specified time, it indicates that the turbine has the ability to operate under high voltage conditions, i.e., it has high-voltage ride-through capability. If it cannot operate normally, it indicates that the turbine does not have the ability to operate under high voltage conditions, i.e., it does not have high-voltage ride-through capability.

[0039] In this embodiment, the bottom of the test chamber 1 is provided with four wheels 10 for easy movement. A placement area 12 can be provided on the top of the protective shell 7 for storing the fixing components 3. A handrail 11 is provided at one end of the test chamber 1, making it easier to move the test chamber 1 on the ground.

[0040] In this embodiment, the fixing component 3 includes an upper box 301 and a lower box 302 that are detachably connected. A wire passage hole 303 is formed between the upper box 301 and the lower box 302. Both the upper box 301 and the lower box 302 are integrally injection molded insulating plastic parts. The surface of the wire passage hole 303 is made of insulating rubber. A positioning member 304 is provided in the middle of the lower box 302. The positioning member 304 is electrically connected to the connecting wire 2. A fixing member 305 is provided in the middle of the upper box 301 that cooperates with the positioning member 304 to clamp the cable. The upper box 301 is detachably connected to the lower box 302 by an adjusting screw 306 passing through it.

[0041] More specifically, the positioning component 304 is a semi-circular ring, which facilitates the positioning of cylindrical cables, and the lower part of the fixing component 305 is a serrated component, which can cooperate with the fixing component 305 to clamp the cable and prevent it from coming off or rotating.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-voltage ride-through testing device for wind turbine generator sets, characterized in that, include: A test chamber, with connecting wires connected to both ends of the test chamber, and a fixing component installed at the end of the connecting wires; The test chamber contains a test circuit board and a supercapacitor module. A display screen is located on the top of the test chamber, and a protective shell is installed on the outside of the display screen. The test circuit board can be connected to the wind turbine under test and the power grid through the connecting wires at both ends. The test circuit board is equipped with a current-limiting reactor group, a parallel capacitor group, thyristors, and multiple circuit breakers. The supercapacitor module is connected to the DC bus of the wind turbine under test.

2. The high-voltage ride-through testing equipment for wind turbine generator sets according to claim 1, characterized in that, The test circuit board is provided with a main detection circuit and a branch detection circuit. The current-limiting reactor is connected to the main detection circuit, and the thyristor and the parallel capacitor are connected to the branch detection circuit. One end of the branch detection circuit is connected to the main detection circuit, and the circuit breaker is provided at both ends of the main detection circuit.

3. The high-voltage ride-through testing equipment for wind turbine generator sets according to claim 1, characterized in that, A transformer is connected between the power grid and the test circuit board.

4. The high-voltage ride-through testing equipment for wind turbine generator sets according to claim 2, characterized in that, It also includes a non-detection bypass, on which the circuit breaker is connected.

5. The high-voltage ride-through testing equipment for wind turbine generator sets according to claim 1, characterized in that, The supercapacitor module is connected to the DC bus of the wind turbine under test via a bidirectional converter.

6. The high-voltage ride-through testing equipment for wind turbine generator sets according to claim 1, characterized in that, The test chamber is also equipped with an intelligent monitoring module, which is used to collect the voltage, current and power data of the wind turbine under test in real time, and the display screen is used to display the collected voltage, current and power data.

7. The high-voltage ride-through testing equipment for wind turbine generator sets according to claim 1, characterized in that, The test chamber is equipped with four wheels at the bottom.

8. The high-voltage ride-through testing equipment for wind turbine generator sets according to claim 1, characterized in that, A handrail is provided at one end of the test chamber.

9. The high-voltage ride-through testing equipment for wind turbine generator sets according to claim 1, characterized in that, The fixing assembly includes a detachably connected upper box and a lower box, with a wire passage hole formed between the upper box and the lower box. A positioning member is provided in the middle of the lower box, and the positioning member is electrically connected to the connecting wire. A fixing member is provided in the middle of the upper box, which cooperates with the positioning member to clamp the cable. The upper box is detachably connected to the lower box through an adjusting screw passing through it.

10. The high-voltage ride-through testing equipment for wind turbine generator sets according to claim 9, characterized in that, The positioning component is a semi-circular ring, and the fixing component is a serrated component.

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