KR102607822B1 - The cyclic load test apparatus for a superconducting coil of wind power generator and the test method thereof - Google Patents

Abstract

The present invention relates to a cryogenic vessel, a superconducting coil module housed in the cryogenic vessel, a support module connected to the cryogenic vessel and the superconducting coil module to support the superconducting coil module, an armature module arranged to have an air gap with respect to the superconducting coil module, and a superconducting coil module. Including a superconducting power unit that applies direct current power and an armature power unit that applies alternating current power to the armature module, the fatigue load generated on the superconducting coil can be implemented by the torque of the wind generator. As a result, the stability of superconducting coils for wind power generators can be easily and conveniently evaluated.

Description

Superconducting coil repetitive load test device and test method for wind power generators {THE CYCLIC LOAD TEST APPARATUS FOR A SUPERCONDUCTING COIL OF WIND POWER GENERATOR AND THE TEST METHOD THEREOF}

The present invention relates to a cyclic load test device and test method for superconducting coils for wind power generators, and more specifically, to a cyclic load test for superconducting coils for wind power generators that can easily implement repetitive loads on the superconducting coils of wind power generators to ensure stability. It relates to devices and test methods.

The larger the wind power generator's capacity, the more limited the size of the permanent magnet's magnetic field limits the weight and volume of the generator. Accordingly, superconducting wind power generators using superconducting coils are being studied. However, in the case of superconducting coils, there is a lack of verification of the Lorentz force and high torque of the superconducting coil and structural support due to the fact that it is operated in a cryogenic environment, the strong magnetic field generated by the superconducting coil, and the characteristics of wind power generators that operate at low speeds.

In the case of actually manufacturing a wind power generator without verifying the superconducting coils, if any one of the plurality of superconducting coils experiences poor performance or problems with mechanical stability, collisions between superconducting coils and effects on the entire wind power generator system may result in a loss of overall cost. There is a problem that additional costs are incurred.

Republic of Korea Patent Publication No. 10-2005-0115272 (published on December 7, 2005) Republic of Korea Patent Publication No. 10-2202703 (registered on January 7, 2021)

The purpose of one embodiment of the present invention is to provide a cyclic load test device and test method for a superconducting coil of a wind turbine that can easily perform a cyclic load test on a superconducting coil of a wind turbine and ensure stability.

In order to achieve the above-described object, a superconducting coil repetitive load test device for a wind power generator according to an embodiment of the present invention is connected to a cryogenic vessel, a superconducting coil module housed in the cryogenic vessel, and the cryogenic vessel and the superconducting coil module to conduct superconducting It is characterized by comprising a support module for supporting the coil module, an armature module arranged to have an air gap with respect to the superconducting coil module, a superconducting power supply unit for applying direct current power to the superconducting coil module, and an armature power supply unit for applying alternating current power to the armature module. Do it as

In addition, the alternating current power applied by the armature power supply unit is characterized by inducing repetitive torque changes in the superconducting coil module.

In addition, it is characterized by including a rectifier that rectifies the AC power of the armature power supply and supplies it to the armature module.

In addition, the frequency of the AC power supplied from the armature power unit is set according to the preset number of times the rated torque of the wind turbine is reached during the operating life of the wind turbine.

In addition, the superconducting coil module includes at least three superconducting coils, and the three or more superconducting coils are connected in series along the first axis in a plane.

In addition, the armature module includes three or more armature coils corresponding to each of three or more superconducting coils, and the armature power supply unit includes three or more alternating current sources that apply power to each of the three or more armature coils.

Additionally, three or more armature coils are arranged sequentially along the first axis.

In addition, the rectifier is characterized by including an armature coil and a diode connected to an alternating current source.

In addition, the cyclic load test method for superconducting coils for wind power generators according to an embodiment of the present invention includes a vacuum step of forming a vacuum inside a cryogenic container containing a superconducting coil module, and adjusting the superconducting coil module contained in the cryogenic container to an operating temperature. A cooling step of cooling, a charging step of applying power to the superconducting coil module to charge it to the target current, and a power application step of applying alternating current power to the armature module arranged to have an air gap with respect to the superconducting coil module. do.

In addition, the power application step is a frequency calculation step of calculating the number of times the rated torque of the wind generator is reached during the operating life of the wind power generator, and a frequency calculation step of calculating the frequency of the AC power supplied from the armature power source according to the number of times it is reached. It is characterized by including.

According to the present invention, it is possible to verify and secure the lifespan and repetitive load due to torque changes occurring in the superconducting coil during actual operation of the wind turbine.

Figure 1 is a diagram schematically showing a superconducting coil repetitive load test device for a wind power generator according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating the superconducting coil module and support module shown in FIG. 1.
FIG. 3 is a circuit diagram of a superconducting coil repetitive load test device for a wind power generator shown in FIG. 1.
FIG. 4 is a circuit diagram illustrating another embodiment of the superconducting coil repetitive load test device for wind power generators shown in FIG. 3.
FIG. 5 is a graph for explaining the operation of the rectifier shown in FIG. 4.
Figure 6 is a flow chart showing a cyclic load test method for a superconducting coil for a wind power generator according to an embodiment of the present invention.
FIG. 7 is a flow chart showing an example of the power application step shown in FIG. 6.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. However, the embodiments described below are provided for illustrative purposes only to facilitate a clear understanding of the present invention, and do not limit the scope of the present invention.

The shape, size, ratio, angle, number, etc. shown in the drawings for explaining embodiments of the present invention are illustrative, and the present invention is not limited to the matters shown in the drawings. Like components may be referred to by the same reference numerals throughout the specification. In describing the present invention, if it is determined that a detailed description of related known technology may unnecessarily obscure the gist of the present invention, the detailed description is omitted.

When 'includes', 'has', 'consists of', etc. mentioned in this specification are used, other parts may be added unless the expression 'only' is used. If a component is expressed in the singular, the plural is included unless specifically stated. In addition, when interpreting components, it is interpreted to include the margin of error even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as 'on top', 'on the top', 'on the bottom', 'next to', etc., 'immediately' Alternatively, one or more other parts may be placed between the two parts, unless the expression 'directly' is used.

Spatially relative terms such as “below, beneath,” “lower,” “above,” and “upper” refer to one element or component as shown in the drawing. It can be used to easily describe the correlation with other elements or components. Spatially relative terms should be understood as terms that include different directions of the element during use or operation in addition to the direction shown in the drawings. For example, if an element shown in the drawings is turned over, an element described as “below” or “beneath” another element may be placed “above” the other element. Accordingly, the illustrative term “down” may include both downward and upward directions. Likewise, the illustrative terms “up” or “on” can include both up and down directions.

In the case of a description of a temporal relationship, for example, if a temporal relationship is described as 'after', 'successfully after', 'after', 'before', etc., 'immediately' or 'directly' Unless the expression is used, non-continuous cases may also be included.

Although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are merely used to distinguish one component from another. Accordingly, the first component mentioned below may also be the second component within the technical spirit of the present invention.

The term “at least one” should be understood to include all possible combinations from one or more related items. For example, “at least one of the first, second, and third items” means each of the first, second, or third items, as well as two of the first, second, and third items. It can mean a combination of all items that can be presented from more than one.

Each feature of the various embodiments of the present invention can be partially or fully combined or combined with each other, various technical interconnections and operations are possible, and each embodiment may be implemented independently of each other or may be implemented together in a related relationship. It may be possible.

Hereinafter, the superconducting coil repetitive load test device (1) for wind power generators according to a preferred embodiment of the present invention will be described in detail.

Figure 1 is a diagram schematically showing a superconducting coil repetitive load test device 1 for a wind power generator according to an embodiment of the present invention, and Figure 2 is a diagram showing the superconducting coil module 20 and the support module 30 shown in Figure 1. ), and FIG. 3 is a circuit diagram of the superconducting coil repetitive load test device 1 for a wind power generator shown in FIG. 1.

Referring to Figures 1 to 3, the superconducting coil repetitive load test device for wind power generators (1) according to an embodiment of the present invention evaluates the stability of the superconducting coil by implementing an actual fatigue load on the superconducting coil installed in the wind power generator. It is for this purpose. For this purpose, the superconducting coil repetitive load test device for wind power generators (1) includes a cryogenic container (10), a superconducting coil module (20), a support module (30), an armature module (40), a superconducting power unit (50), and an armature power unit ( 60).

The cryogenic container 10 can maintain its interior at a cryogenic temperature. The cryogenic container can be cooled to an operating temperature of 30K to 40K by a cryogenic freezer (not shown). A plurality of insulating members (multi layer insulation, not shown) may be disposed on the inner wall of the cryogenic container 10 to shield radiant heat. For example, 30 to 50 insulating members may be disposed. As a result, the influence of convection and heat intrusion on the superconducting coil module 20 can be minimized. The cryogenic container 10 may be maintained in a vacuum state by a vacuum forming device (not shown).

The superconducting coil module 20 is accommodated in a cryogenic container 10. The support module 30 is connected to the cryogenic vessel 10 and the superconducting coil module 20. The support module 30 supports the superconducting coil module 20. Support modules 30 may be arranged in plural numbers. The support module 30 may be GFRP (Glass Fiber Reinforced Plastic). As a result, the support module 30 can support high torque and minimize heat transfer from the outside.

The armature module 40 is arranged to have an air gap with respect to the superconducting coil module 20. The superconducting power supply unit 50 applies direct current power to the superconducting coil module 20. Thereby, the superconducting coil module 20 can be charged with the target magnetic field. The armature power supply unit 60 applies alternating current power to the armature module 40. AC power applied to the armature module 40 from the armature power supply unit 60 induces repetitive torque changes in the superconducting coil module 20. At this time, the support module 30 supports torque (change) to the superconducting coil module 20. Therefore, by applying alternating current power from the armature power source 60 to the armature module 40 for a predetermined period of time, the stability against repeated loads acting on the superconducting coil module 20 and the support module 30 can be evaluated. As a result, the reliability of the superconducting coil installed in the wind power generator can be secured.

In addition, it is possible to evaluate the fatigue load acting on the superconducting coil module 20 installed in the wind power generator using a simple and easy method. In addition, fatigue load on the superconducting coil module 20 can be implemented without rotating the superconducting coil module 20. Therefore, the structure of the superconducting coil repetitive load test device 1 for wind power generators is simple, and the manufacturing and evaluation costs are low.

The superconducting coil module 20 includes at least three superconducting coils 200, 210, and 220. Three or more superconducting coils 200, 210, and 220 are connected in series along the first axis (X) in a plane. Therefore, since there is no need for the superconducting coil module 20 to be arranged in a circular shape with respect to the rotation axis, the structure is simple and manufacturing is easy. The number of turns, target current, inductance, and magnetic field of the superconducting coils 200, 210, and 220 may depend on the design conditions of the wind power generator. Meanwhile, among the three or more superconducting coils 200, 210, and 220, the superconducting coils disposed between the superconducting coils disposed at both edges are used for repetitive load evaluation. This is because accurate evaluation is possible only when the influence of adjacent superconducting coils is applied. When four or more superconducting coils are arranged, a plurality of superconducting coils are arranged between the superconducting coils arranged at both edges, so repeated load evaluation of a plurality of superconducting coils is possible. However, size and cost may increase.

In one embodiment, the superconducting coil module 20 may include a first superconducting coil 200, a second superconducting coil 210, and a third superconducting coil 220. The first superconducting coil 200, the second superconducting coil 210, and the third superconducting coil 220 are connected in series along the first axis (X). Accordingly, the first superconducting coil 200, the second superconducting coil 210, and the third superconducting coil 220 may define a triode. In this case, the second superconducting coil 210 can be used for repetitive load evaluation.

The armature module 40 may include three or more armature coils 400, 410, and 420. Three or more armature coils (400, 410, 420) correspond to each of three or more superconducting coils (200, 210, 220). Additionally, the armature power supply unit 60 may include three or more alternating current sources (600, 610, and 620). Three or more alternating current sources (600, 610, 620) apply power to each of three or more armature coils (400, 410, 420). Each of the three or more alternating current sources (600, 610, 620) may form a closed circuit with each of the three or more armature coils (400, 410, 420). Three or more armature coils (400, 410, 420) are sequentially arranged along the first axis (X). Since the armature coils 400, 410, and 420 are not arranged in a circle, the structure is simple and manufacturing is easy.

In one embodiment, the armature module 40 may include a first armature coil 400, a second armature coil 410, and a third armature coil 420. The first armature coil 400, the second armature coil 410, and the third armature coil 420 are sequentially arranged along the first axis (X). The first armature coil 400, second armature coil 410, and third armature coil 420 define three phases (U, V, W). The armature power supply unit 60 may apply different AC power to the first armature coil 400, the second armature coil 410, and the third armature coil 420.

In one embodiment, the armature power supply unit 60 may include a first AC source 600, a second AC source 610, and a third AC source 620. The first AC source 600 applies first phase AC power to the first armature coil 400. The first AC source 600 forms a closed loop with the first armature coil 400. The second AC source 610 applies second-phase AC power to the second armature coil 410. The second AC source 610 forms a closed loop with the second armature coil 410. The third AC source 620 applies third phase AC power to the third armature coil 420. The third AC source 620 forms a closed loop with the third armature coil 420. Each of the first to third superconducting coils 200 to 220 is arranged to be spaced apart from the first to third armature coils 400 to 420 by a predetermined gap.

Meanwhile, a wind power generator may have a predetermined operating life. The operating life of a wind turbine can be predetermined by design. A wind turbine reaches its rated torque multiple times during its operating life. For the cyclic load test of the superconducting coil, the number of times to reach the rated torque of the wind turbine during the operating life of the wind turbine can be set in advance. Here, the frequency of the AC power supplied from the armature power unit 60 to the armature coils 400, 410, and 420 may be set according to the number of times the rated torque of the wind power generator is reached during the operation life of the wind power generator. For example, as the number of arrivals increases, the frequency of the AC power supplied from the armature power unit 60 may also increase.

FIG. 4 is a circuit diagram showing another embodiment of the superconducting coil repetitive load test device 1 for a wind power generator shown in FIG. 3, and FIG. 5 is a graph for explaining the operation of the rectifier 70 shown in FIG. 4. .

Referring to FIG. 4, the superconducting coil repetitive load test apparatus 1 for a wind power generator according to an embodiment of the present invention may further include a rectifier 70. The rectifier 70 rectifies the AC power applied by the armature power unit 60. As a result, the AC power supplied from the armature power unit 60 to the armature module 40 can be rectified.

The AC power supplied from the armature power supply unit 60 has a positive (+) cycle and a negative (-) cycle. In this case, the superconducting coil module 20 and the support module 30 can receive force in one direction during the positive cycle of AC power. Conversely, during the negative cycle of AC power, the superconducting coil module 20 and the support module 30 may receive force in other directions. That is, the force acting on the superconducting coil module 20 and the support module 30 is generated inversely according to the positive and negative cycles of the AC power. The rectifier 70 rectifies the AC power so that the force acting on the superconducting coil module 20 and the support module 30 can be generated in one direction. As a result, the force acting on the superconducting coil module 20 and the support module 30 can change in the range from 0 to a predetermined rated torque (+) to meet actual conditions. In the case where the rectifier 70 is not present, the force acting on the superconducting coil module 20 and the support module 30 changes in the range from (-) rated torque to (+) rated torque, making the test under harsher conditions than actual conditions. do.

The rectifier 70 may include a diode. For example, the rectifier 70 may include a first diode 700 and a second diode 710. As a result, the negative (-) half cycle of the alternating current applied from the first to third AC sources (600, 610, 620) also changes into a positive (+) half cycle, so the cycle to be tested (armature power supply unit 60) A repetitive load with a period twice as fast as the frequency of alternating current applied may be generated. For example, if the cycle (frequency) to be tested is 3Hz, the same repetitive load can be induced by applying a cycle (frequency) of 6Hz.

Referring to Figure 5, the first to third AC sources (600, 610, 620) supply first to third currents (A) to the first to third armature coils (400, 410, 420). (C) may be approved. The rectifier 70 performs full-wave rectification of the first current (A) to the third current (C). As a result, the forces (radial force and tangential force) acting on the superconducting coil module 20 and the support module 30 are changing in size, but in a positive (+) range. Therefore, the direction of the force acting on the superconducting coil module 20 and the support module 30 does not change in the opposite direction.

Figure 6 is a flow chart showing a method of repetitive load testing of a superconducting coil for a wind power generator according to an embodiment of the present invention, and Figure 7 is a flow chart showing an example of the power application step (S40) shown in Figure 6. am.

Referring to Figures 6 and 7, the superconducting coil cyclic load test method for wind power generators includes a vacuum step (S10), a cooling step (S20), a charging step (S30), and a power application step (S40).

In the vacuum step (S10), a vacuum is formed inside the cryogenic container 10 containing the superconducting coil module 20. In the cooling step (S20), the superconducting coil module 20 accommodated in the cryogenic container 10 is cooled to the operating temperature. Here, the operating temperature corresponds to the cryogenic range of 30K to 40K. In the charging step (S30), power is applied to the superconducting coil module 20 to charge it to the target current (magnetic field). Direct current is applied to the superconducting coil module 20.

In the power application step (S40), power is applied to the armature module 40 arranged to have an air gap with respect to the superconducting coil module 20. Here, AC power is applied to the armature module 40. The power application step (S40) may include a count calculation step (S400) and a frequency calculation step (S410).

In the number calculation step (S400), the number of times the rated torque of the wind power generator is reached during the operation life of the wind power generator can be calculated. In the frequency calculation step (S410), the frequency of the AC power supplied from the armature power unit 60 to the armature module 40 can be calculated according to the number of arrivals.

Meanwhile, the cyclic load test method for superconducting coils for wind power generators according to an embodiment of the present invention can use the superconducting coil cyclic load test device 1 for wind power generators described in FIGS. 1 to 5.

Although the invention made by the present inventor has been described in detail according to the above-mentioned embodiments, the present invention is not limited to the above-described embodiments and, of course, can be changed in various ways without departing from the gist of the invention.

1: Superconducting coil test device for wind power generators
10: Cryogenic container
20: Superconducting coil module
30: Support module
40: Armature module
50: Superconducting power unit
60: Armature power unit
70: rectifier

Claims (10)

Cryogenic container;
A superconducting coil module housed in the cryogenic container;
a support module accommodated in the cryogenic container and connected to the superconducting coil module to support the superconducting coil module;
an armature module arranged to have an air gap with respect to the superconducting coil module;
a superconducting power supply unit that applies direct current power to the superconducting coil module; and
It includes an armature power unit that applies alternating current power to the armature module,
The armature power unit includes a plurality of AC power sources, and the armature module induces a torque change of the superconducting coil by the plurality of AC power sources. According to claim 1,
A superconducting coil repetitive load test device for a wind power generator that evaluates the fatigue load acting on the superconducting coil module based on the torque change. According to claim 1,
A superconducting coil repetitive load test device for a wind power generator including a rectifier that rectifies the AC power of the armature power supply and supplies it to the armature module. According to claim 3,
A superconducting coil repetitive load test device for a wind power generator in which the frequency of the alternating current power supplied from the armature power unit is set according to the preset number of times the rated torque of the wind power generator is reached during the operating life of the wind power generator. According to claim 3,
The superconducting coil module includes at least three superconducting coils,
A superconducting coil repetitive load test device for a wind power generator, wherein the three or more superconducting coils are connected in series along the first axis in a plane. According to claim 5,
The armature module includes three or more armature coils corresponding to each of the three or more superconducting coils,
The armature power supply unit is a superconducting coil repetitive load test device for a wind power generator including three or more AC sources that apply power to each of the three or more armature coils. According to claim 6,
A superconducting coil repetitive load test device for a wind power generator in which the three or more armature coils are arranged sequentially along the first axis. According to claim 6,
The rectifier is a superconducting coil repetitive load test device for a wind power generator including a diode connected to the armature coil and the AC source. A vacuum step of forming a vacuum inside the cryogenic container containing the superconducting coil module;
A cooling step of cooling the superconducting coil module contained in the cryogenic container to an operating temperature;
A charging step of applying power to the superconducting coil module to charge it to a target current; and
A power application step of applying three or more alternating current powers to three or more armature modules arranged to have an air gap with respect to the superconducting coil module; and
A superconducting coil repetitive load test method for a wind power generator comprising a torque conversion step in which the torque of the superconducting coil module is changed by the armature module. According to clause 9,
The power application step is,
A count calculation step of calculating the number of times the rated torque of the wind power generator is reached during the operating life of the wind power generator; and
A cyclic load test method for a superconducting coil for a wind power generator including a frequency calculation step of calculating the frequency of the AC power supplied from the armature power source according to the number of arrivals.

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