KR102288616B1 - Reactor with adjustable inductance value - Google Patents

Abstract

A reactor with an adjustable inductance value is disclosed. A reactor according to an embodiment of the present invention includes a sensor unit for measuring a current or voltage flowing through the reactor; a control unit calculating a gap size of a core for adjusting an inductance value of the reactor based on the signal measured by the sensor unit; and an operation unit adjusting the inductance value of the reactor in response to the measured signal by adjusting the gap size of the core according to a control signal corresponding to the calculated gap size, wherein the operation unit is the yoke core of the reactor By moving (Yoke Core) up and down, left and right, or rotating, the gap of the core can be adjusted.

Description

Reactor with adjustable inductance value}

The present invention relates to single-phase and three-phase reactors with adjustable inductance values, and more specifically, to prevent current imbalance caused by different inductance values of each phase of a three-phase reactor, and automatically adjust the air gap of the reactor to adjust the inductance value It is about a reactor that can change

In general, in order to use electricity in each home and industrial site, electricity produced in a power plant must be received through a transmission and distribution process. Electricity (current) supplied from the power plant to the consumer is not stable due to the change in impedance (Z) due to the step-up process and the inductance of the cable itself. . Therefore, it is necessary to stabilize the electrical quality, mainly by using a reactor and a capacitor (capacitor) to stabilize the electrical quality. At this time, the types of the reactor used include a shunt reactor, a current-limiting reactor, a fire extinguishing reactor, a sizing reactor, and the like.

As renewable energy, including solar power and wind power, is applied to daily life, and electronic products that use DC electricity gradually increase, harmonics increase due to components such as noise in electricity, and power loss Due to this increase, it is necessary to actively review the quality of electricity.

Types of reactors include inverter reactors applied to solar power, wind power, and ESS (Energy Storage System), series reactors that remove 3rd, 5th and 7th harmonics, and starter reactors that start motors, as well as shunt reactors and shunt reactors used in KEPCO. There is a reactor such as a discharge coil. The role of the reactor is to convert electric energy into magnetic energy and store it, and it plays a role in smoothing the fluctuating current by using the property that the current flowing in the reactor does not change rapidly.

Embodiments of the present invention prevent current imbalance caused by different inductance values of each phase of a three-phase reactor, and change the inductance value by automatically adjusting the air gap of the reactor according to the customer's purpose of use, thereby optimizing power quality and optimization It provides a reactor that can maintain its original shape.

A reactor according to an embodiment of the present invention includes a sensor unit for measuring a current or voltage flowing through the reactor; a control unit calculating a gap size of a core for adjusting an inductance value of the reactor based on the signal measured by the sensor unit; and an operation unit adjusting the inductance value of the reactor in response to the measured signal by adjusting the gap size of the core according to a control signal corresponding to the calculated gap size.

The operation unit may adjust the gap of the core by moving the yoke core of the reactor up and down, moving it left and right, or rotating it.

The yoke core shape of the reactor may include at least one of a Y-type, a delta-type, a circle, and a rectangle in the case of a three-phase reactor.

In the yoke core, the upper yoke core and the lower yoke core may have the same shape or different shapes.

The reactor may be any one of an inverter reactor applied to a photovoltaic system, a starting reactor in which an amount of current changes when a motor is started, and a series reactor in which an inductance value is changed by the order of harmonics.

When the reactor is a three-phase reactor having a rectangular shape, the operation unit may adjust the gap size of the core according to a control signal corresponding to the calculated gap size so that magnetic path lengths of each phase are the same.

In the case of a three-phase reactor, the reactor may adjust the gap size of the core by a control signal corresponding to the calculated gap size so that the magnetic path lengths of each phase are the same.

When the yoke core shape of the reactor is Y-shaped, the operation unit may adjust the inductance value of the reactor by vertically moving a triangle corresponding to the center of the Y-shape or a part of the Y-shape including the center of the Y-shape. .

A triangle corresponding to the center of the Y-shape or a portion of the Y-shape including the center of the Y-shape is formed in a bobbin structure, and may be formed in a structure in which a single core or a plurality of cores are stacked.

According to the embodiments of the present invention, current imbalance caused by different inductance values of each phase of a three-phase reactor is prevented, and the air gap of the reactor is automatically adjusted according to the customer's purpose of use to change the inductance value, thereby improving power quality and an optimized shape.

In the case of a solar power system, when the energy of the solar power generation is less than 30% in the morning and evening, the noise can be effectively removed only when the inductance (L) value is higher than when the power generation is 100%. By adjusting the inductance value according to energy, it is possible to improve the efficiency of the photovoltaic power generation system at a low load. The present invention is equally applied to the wind power generation system, so that the amount of electricity generation can be improved by adjusting the inductance value according to the wind speed.

In addition, in the case of a starting reactor, the inductance value is adjusted according to time in consideration that the starting time of the motor is within 60 seconds. For example, by lowering the inductance value, the burden on the starting current of the motor is reduced, and the can increase lifespan. In particular, in the case of repeatedly turning on/off the motor, it is possible to implement stabilization of the electric quality with a more efficient control method.

In the case of using a series reactor that removes 3, 5, and 7 harmonics, it is divided into an active filter and a passive filter according to the operation method. In the case of an active filter, in order to remove each harmonic, a reactor and a capacitor should have as many harmonics as the number of harmonics to be removed as a pair.

In the embodiments of the present invention, in the case of a passive reactor, harmonic removal is limited, but by adjusting the inductance value, the area is widened and more effects can be seen with the same structure.

1 shows the configuration of a reactor having an adjustable inductance value according to an embodiment of the present invention.
2 shows exemplary views of the structure of a reactor for the inductance values of three phases to be the same in the present invention.
3 is a diagram illustrating exemplary views for explaining a method of adjusting an inductance value in each of the reactors shown in FIG. 2 .

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

The terminology used herein is for the purpose of describing the embodiments, and is not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, "comprises" and/or "comprising" refers to the presence of one or more other components, steps, operations and/or elements mentioned. or addition is not excluded.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless specifically defined explicitly.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The same reference numerals are used for the same components in the drawings, and repeated descriptions of the same components are omitted.

Embodiments of the present invention prevent current imbalance caused by different inductance values of each phase of a three-phase reactor, and automatically adjust the air gap of the reactor according to the customer's purpose of use to change the inductance value. Its gist is to provide an adjustable reactor.

According to the present invention, in the case of a three-phase reactor, the MPL (Magnetic Path Length) should have the same structure, and for this purpose, it may have any one of a Y-type, a delta-type or a triangle, and a circular and a rectangular shape. The reactor may include a yoke core formed at upper and lower portions and a leg core around which a coil is wound, and the shape of the reactor may mean a shape with respect to the yoke core. Of course, the shape of the leg core may have a rectangular shape or a circular shape.

Here, the material of the core is at least one of supercore, permalloy, powder (eg, sendust, megaflux, iron, etc.), amorphous, silicon (Fe-Si), ferrite, nano-core, and iron alloy. more can be used.

Furthermore, the present invention can be applied to any one of an inverter reactor applied to a photovoltaic system, a starting reactor in which the amount of current changes when the motor is started, and a series reactor in which the inductance value is changed by the order of harmonics. In the case of an adjustable rectangular three-phase reactor, the inductance value is the same by adjusting the size of the magnetic permeability (μ) flowing through the three phases by varying the number of turns (N) or the gap size of each phase or by combining cores with different permeability. you can make it do

1 shows the configuration of a reactor having an adjustable inductance value according to an embodiment of the present invention.

Referring to FIG. 1 , a reactor according to an embodiment of the present invention may include a sensor unit 100 , a control unit 200 , an operation unit 300 , and a transceiver 400 , and the transceiver 400 is a situation It may or may not be provided depending on the

The sensor unit 100 includes at least one sensing means for measuring a current or voltage flowing through the reactor, and in the case of a three-phase reactor, the current or voltage flowing through each phase may be measured.

Here, the sensor unit 100 may measure a current or a voltage applied to each phase according to a load, may measure a current flowing through each phase by using a current sensor, and measure the voltage (shunt) can be used to measure the voltage across each phase. Of course, the method for measuring the current or voltage is not limited to the above-described method, and it is apparent to those skilled in the art that any method capable of measuring the voltage or current of each phase may be applied.

The control unit 200 calculates the inductance value of the reactor based on the measurement signal for the current or voltage flowing in the reactor or each phase measured by the sensor unit 100, and the gap size of the core corresponding to the calculated inductance value ( or air gap size).

Here, in order to adjust the inductance value according to the load applied to the reactor, the controller 200 calculates an inductance value according to the load and calculates the size of the gap or air gap of the core to have the calculated inductance value.

Of course, the control unit 200 may calculate the inductance value of the reactor according to the load in consideration of the type of the three-phase reactor and the shape of the yoke core, and the method of calculating the gap size according to the calculated inductance value may also be predetermined. .

The control unit 200 generates a control signal for adjusting the gap size of the core and provides it to the operation unit.

The operation unit 300 adjusts the inductance value of the reactor according to the load of the reactor by adjusting the gap size of the core based on the control signal received from the control unit 200 .

At this time, the operation unit 300 may include means for moving the gap of the core, and may move from the current core gap of the reactor by the gap size calculated by the control unit 200 , and move the core up and down. The size of the gap in the core can be adjusted by turning it, moving it left or right, or rotating it.

In the case of a starting reactor, there may be products without a voltage sensor part depending on the characteristics of the product. In this case, a remote transmission/reception device may be provided to remotely adjust the inductance value of the reactor according to the industrial field to which the product is applied.

The transceiver 400 may be a component corresponding to the remote transceiver equipment. Of course, the transceiver 400 may not be provided when the sensor unit 100 is provided, but may be provided even when the sensor unit 100 is provided, and a signal measured by the sensor unit 100 . can automatically adjust the inductance value of the reactor, or when an inductance value to be adjusted is received through the transceiver, the inductance value of the reactor can be adjusted based on the received inductance value.

The reactor of the present invention will be described with reference to FIGS. 2 and 3 as follows.

2 is an exemplary view showing a structure of a reactor for the inductance values of three phases to be the same in the present invention, and is shown in Y-type, delta-type, circular and rectangular shapes according to the shape of the yoke core.

As shown in Figure 2, the reactor according to the embodiment of the present invention is a three-phase reactor, depending on the shape of the yoke core, Y-shaped 510, delta-type 520, circular 530 and rectangular 540. may be distinguished, and the shape of the upper yoke core and the shape of the lower yoke core may be configured differently depending on circumstances. For example, as shown in FIG. 2D , the shape of the upper yoke core may be a delta-type 520 , and the shape of the lower yoke core may have a circular shape 530 . In addition, in a reactor having a different yoke core shape, even if the Y-type yoke core is used as the upper yoke core or the lower yoke core, there may be no error in the inductance value.

In this case, the material of the core is at least one of supercore, permalloy, powder (eg, sendust, megaflux, iron, etc.), amorphous, silicon (Fe-Si), ferrite, nano-core, and iron alloy. You can use more than one.

Through the reactor structure of such a shape, the inductance values of each phase may be the same, which can be seen through <Equation 1> below. At this time, in order to eliminate the error in the inductance value of each phase, the length of the magnetic path of each phase should be the same.

[Equation 1]

Here, N means the number of turns of the coil, μ means permeability, Ac means the cross-sectional area of the core, MPL means magnetic path length, and L means inductance. can mean

In such a reactor, the shape of the leg core on which the coil is wound may have a rectangular or circular shape in the shape of the yoke core.

FIG. 3 is a diagram illustrating exemplary views for explaining a method of adjusting an inductance value in each of the reactors shown in FIG. 2 .

3A is an exemplary view for explaining a method of adjusting the inductance value in the reactor of FIG. 2A. As shown in FIG. 3A, the yoke core shape is a Y-shape or a Y-shape 510 in a three-phase reactor. In order to adjust the inductance value of or the inductance value of each phase, the triangular region 511 formed in the center of the yoke core or a part of the Y-shaped region 512 including the center of the Y-shaped yoke core is moved upward or downward. , by varying the gap size and thereby adjusting the inductance value of the reactor or each phase. Of course, the amount of movement upward or downward may be calculated by the control unit of FIG. 1 .

Here, the triangular region 511 or a part of the Y-shaped region 512 may be formed in a bobbin structure, and may be formed in a structure in which a single core or a plurality of cores are stacked. For example, the triangular region or a part of the Y-shaped region may have a structure in which powder, ferrite, and silicon are stacked.

At this time, when the center of the triangular region moves up and down in the Y-type reactor, it is possible to take into consideration that the magnetic flux is concentrated to a high magnetic permeability, and to maintain a constant interval so that the magnetic flux is not concentrated in the short direction of the magnetic path.

Figure 3b shows an exemplary view for explaining a method of adjusting the inductance value in the reactor of Figure 2b, as shown in Figure 3b, the yoke core shape of the reactor in a three-phase reactor of a delta-type or triangular 520 In order to adjust the inductance value or the inductance value of each phase, by moving the upper yoke core 520 upward or rotating left and right, the gap size can be changed and thereby the inductance value of the reactor or each phase can be adjusted. Here, the size moved up or down or the size rotated left and right may be calculated by the controller of FIG. 1 .

3c is an exemplary diagram for explaining a method of adjusting the inductance value in the reactor of FIG. 2c, and as shown in FIG. 3c, the inductance value of the reactor in a three-phase reactor having a circular yoke core shape 530 or In order to adjust the inductance value of each phase, by moving the upper yoke core 530 upward or downward, the size of the gap may be changed and thus the inductance value of the reactor or each phase may be adjusted. Here, the amount of movement upward or downward may be calculated by the control unit of FIG. 1 .

3D shows an exemplary diagram for explaining a method of adjusting the inductance value in the reactor of FIG. 2F, and as shown in FIG. 3D, the inductance value of the reactor or In order to adjust the inductance value of each phase, by moving the upper yoke core 530 upward or downward, or moving it left and right, the gap size can be changed and thus the inductance value of the reactor or each phase can be adjusted. Here, the amount of movement upward or downward may be calculated by the control unit of FIG. 1 . Even in such a structure, the permeability can be supplemented by mixing the material of the yoke core with a single or a plurality of materials.

As described above, the reactor according to the embodiments of the present invention prevents current imbalance caused by different inductance values of each phase of the three-phase reactor, and automatically adjusts the air gap of the reactor according to the customer's purpose of use to change the inductance value By doing so, power quality and optimized shape can be maintained.

In addition, when the reactor according to embodiments of the present invention is applied to a photovoltaic system, the efficiency of the photovoltaic power generation system can be improved at a low load by adjusting the inductance value according to the energy of the solar power generation amount, and the wind power generation system When applied to , the amount of electricity generation can be improved by adjusting the inductance value according to the wind speed.

In addition, in the reactor according to the embodiments of the present invention, the load on the starting current of the motor is reduced by adjusting the inductance value according to time in consideration that the starting time of the motor is within 60 seconds in the case of the starting reactor, and the lifespan of the motor can be increased

In addition, since the reactor according to the embodiments of the present invention can remove each harmonic with one reactor, cost can be reduced.

In addition, the reactor according to the embodiments of the present invention maintains a constant value of the coil temperature even during repeated operation for a long time without saturating the core by the magnitude of the current when operating conditions and the driver's inductance value are manipulated. can drive.

In addition, the reactor according to the embodiments of the present invention may include a hybrid reactor in which the inductance value is automatically changed according to the magnitude of the current as a characteristic of the powder core constituting the reactor even without the sensor unit.

In addition, the reactor according to the embodiment of the present invention automatically adjusts the inductance value according to the load of the reactor, and the method of adjusting the inductance value is not limited to the above description, and the inductance value of the reactor can be automatically adjusted. Various methods may be applied. Of course, the method of automatically adjusting the inductance value is not limited to a physical structural change.

As described above, although the embodiments have been described with reference to the limited embodiments and drawings, various modifications and variations are possible from the above description by those skilled in the art. For example, the described techniques are performed in a different order than the described method, and/or the described components of the system, structure, apparatus, circuit, etc. are combined or combined in a different form than the described method, or other components Or substituted or substituted by equivalents may achieve an appropriate result.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (7)

To form a three-phase, three leg cores spaced apart from each other, and a coil surrounding the individual leg cores, and a yoke core positioned at one end and the other end of the individual leg cores. ;
a sensor unit for measuring a current or voltage flowing in the coil of the individual leg core;
a control unit for calculating a gap size of the individual leg core and the core for adjusting an inductance value between the coil and the yoke core based on the signal measured by the sensor unit; and
By adjusting the gap size of the core according to the control signal corresponding to the calculated gap size, the operation unit for adjusting the inductance value between the individual leg core and the coil and the yoke core in response to the measured signal including,
The yoke core is
It is detached from one of the one end and the other end of the individual leg core through the operation unit,
forming a gap of the core with the individual leg core on and off the coil;
having the same shape or different shapes at the one end and the other end of the individual leg cores,
The operation unit,
A reactor for adjusting the gap of the core by moving the yoke core up and down relative to the individual leg cores relative to the respective leg cores, or by moving or rotating the yoke core relatively left and right.
delete According to claim 1,
The shape of the yoke core is
A reactor comprising one of Y-shaped, delta-shaped, circular and rectangular.
delete According to claim 1,
The reactor is
A reactor for an inverter applied to a photovoltaic system, a starting reactor in which the amount of current changes when the motor is started, and a series reactor in which the inductance value changes depending on the order of harmonics.
According to claim 1,
the operation unit
When the shape of the yoke core is Y-shaped, by moving a triangle corresponding to the center of the Y-shape or a part of the Y-shape including the center of the Y-shape up and down, the individual leg core and the coil and the yoke core Reactor, characterized in that for adjusting the inductance value.
7. The method of claim 6,
A triangle corresponding to the center of the Y-shaped or some Y-shaped including the center of the Y-shaped is
A reactor formed in a structure of a bobbin, characterized in that it is formed in a structure in which a single core or a plurality of cores are stacked.

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