WO2020101310A1

WO2020101310A1 - Reactance varying device using variable resistor, and method for controlling same

Info

Publication number: WO2020101310A1
Application number: PCT/KR2019/015295
Authority: WO
Inventors: 박종후; 김경탁
Original assignee: 숭실대학교 산학협력단
Priority date: 2018-11-14
Filing date: 2019-11-12
Publication date: 2020-05-22
Also published as: KR102059276B1

Abstract

Disclosed are: a reactance varying device using a variable resistor; and a method for controlling same. The reactance varying device using a variable resistor comprises: a plurality of reactance elements connected in parallel; and a variable resistor connected in series with at least one reactance element from among the plurality of reactance elements, and dispersing a current flowing through the plurality of reactance elements according to changes in resistance value to vary the reactance due to the plurality of reactance elements.

Description

Variable reactance device using variable resistor and control method therefor

The present invention relates to a reactance variable device using a variable resistor and a control method thereof, and more particularly, to a reactance variable device using a variable resistor capable of variable control of reactance by an inductor or capacitor and a control method thereof.

Generally, an inductor means a coil that induces a voltage in proportion to the amount of change in current. The inductance exhibits a property that interferes with the flow of electric current due to a change in the magnetic field generated inside or around the coil.

Inductors used in power conversion circuits such as DC-DC converters, DC-AC inverters, etc. mainly have functions of current smoothing, current suppression, energy storage, and removal of high-frequency components of voltage and current due to semiconductor switching elements. Most inductors used in power conversion circuits have a fixed inductance value. Accordingly, it is not possible to properly respond to the newly required inductance value due to the surrounding environment or circuit changes.

Alternatively, variable inductors can be used. The variable inductor mainly has a structure including a coil and a core. Conventional variable inductors change the position of the core or generate additional magnetic force in the core to vary the inductance value using the magnetic saturation of the coil.

However, in the case of the method of moving the core, there is a disadvantage in that the power consumption of the driving actuator required for the movement of the core is large because the weight of the core is heavy, and in the case of the method using an additional magnetic force, energy loss due to magnetic saturation is caused. have.

One aspect of the present invention provides a variable reactance variable device using a variable resistor and a control method of the reactance by using a characteristic in which a current flow is distributed according to a resistance value in a parallel connection structure.

The reactance variable device using the variable resistance of the present invention for solving the above problems is connected in series with a plurality of reactance elements connected in parallel and at least one reactance element among the plurality of reactance elements, and the plurality of reactances according to a change in resistance value It includes a variable resistor for dispersing the current flowing through the element to vary the reactance by the plurality of reactance elements.

On the other hand, the feedback control method may further include a subtle controller for generating resistance value information of the variable resistor for generating a target reactance.

In addition, the irregular controller detects an electrical parameter from the plurality of reactance elements, calculates an error by comparing the electrical parameter with a target parameter, and uses the calculated error to vary the variable required to follow the target parameter. Resistance value information of a resistance can be generated.

In addition, the variable resistor may be implemented as a transistor in which the resistance value between the drain and the source changes according to the gate voltage.

In addition, a feedback controller may further include a subtle controller that generates information on the gate voltage for generating a target reactance and applies the information on the gate voltage to the variable resistor.

The gate controller may also control the gate voltage so that the transistor operates in an ohmic region.

In addition, the plurality of reactance elements generate a reactance that varies within a range between reactance by the plurality of reactance elements connected in parallel and reactance by any one of the reactance elements of the plurality of reactance elements connected in series. I can do it.

On the other hand, the reactance variable device using the variable resistance of the present invention is connected in parallel with a plurality of reactance elements connected in series and at least one reactance element among the plurality of reactance elements, and current is distributed to a reactance element connected in parallel according to a change in the resistance value. And a variable resistor for varying reactance by the plurality of reactance elements.

Meanwhile, a feedback controller may further include a subtle controller that generates resistance value information of the variable resistor for generating a target reactance.

On the other hand, the control method of the reactance variable device using the variable resistance includes detecting electrical parameters from the plurality of reactance elements, calculating an error between the electrical parameters and target parameters, and calculating the target parameters to follow. Generating resistance value information of a variable resistor connected to at least one reactance element among the plurality of reactance elements by using an error, and the resistance value so that current flowing through the plurality of reactance elements can be distributed by the variable resistor. And changing the resistance value of the variable resistor using information.

According to the present invention, it is possible to minimize its own power consumption for variable reactance, and when applied to a power conversion system, it is possible to generate reactance that can optimize the performance of the system, and continuous reactance can be varied.

1 is a view showing a reactance variable device using a variable resistor according to an embodiment of the present invention.

2 is a circuit diagram illustrating an example in which the reactance element shown in FIG. 1 is provided as an inductor.

3 is a circuit diagram illustrating an example in which the reactance element illustrated in FIG. 1 is provided as a capacitor.

4 is a circuit diagram illustrating an example in which a reactance element is provided as an inductor in a reactance variable device using a variable resistor according to another embodiment of the present invention.

5 is a circuit diagram illustrating an example in which a reactance element is provided as a capacitor in a reactance variable device using a variable resistor according to another embodiment of the present invention.

6 is a flowchart of a method for controlling a reactance variable device using a variable resistor according to an embodiment of the present invention.

For a detailed description of the present invention, which will be described later, reference is made to the accompanying drawings that illustrate, by way of example, specific embodiments in which the invention may be practiced. These examples are described in detail enough to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, the specific shapes, structures, and properties described herein can be implemented in other embodiments without departing from the spirit and scope of the invention in connection with one embodiment. In addition, it should be understood that the location or placement of individual components within each disclosed embodiment can be changed without departing from the spirit and scope of the invention. Therefore, the following detailed description is not intended to be taken in a limiting sense, and the scope of the present invention, if appropriately described, is limited only by the appended claims, along with all ranges equivalent to those claimed. In the drawings, similar reference numerals refer to the same or similar functions throughout several aspects.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

Referring to FIG. 1, the reactance variable apparatus 1000 using a variable resistor according to an embodiment of the present invention includes a plurality of

reactance elements

110 and 120, a variable resistor 200, and a weak controller 300. Can be.

The reactance variable apparatus 1000 using a variable resistor according to an embodiment of the present invention may form one variable reactance element by a plurality of

reactance elements

110 and 120 and the variable resistor 200, and such variable reactance The element has a fixed reactance by a plurality of

reactance elements

110 and 120, and it is possible to vary the fixed reactance according to a change in the resistance value of the variable resistor 200.

The reactance variable device 1000 using a variable resistor according to an embodiment of the present invention may generate a desired reactance value within a variable range of reactance by the feedback controller-based control controller 300. The reactance variable device 1000 using a variable resistor according to an embodiment of the present invention can be used as a variable reactance element that is normally required in a power conversion system, and can generate a reactance that can optimize the performance of the system. have.

The reactance variable device 1000 using a variable resistor according to an embodiment of the present invention may include at least two

reactance elements

110 and 120. In the following description, the first reactance element 110 and the second reactance are described. Two reactance elements of the element 120 are provided as an example.

The first reactance element 110 and the second reactance element 120 may be implemented as an inductor generating an inductive reactance or a capacitor generating a capacitive reactance. In FIG. 1, although the first reactance element 110 and the second reactance element 120 are illustrated as an example of an inductor, the first reactance element 110 and the second reactance element 120 are both capacitors. Alternatively, the first reactance element 110 and the second reactance element 120 may be implemented by combining an inductor and a capacitor, respectively.

The first reactance element 110 and the second reactance element 120 are connected in parallel to each other, so that currents may be dispersed and flow.

The variable resistor 200 is a variable resistor element capable of adjusting the resistance value.

For example, the variable resistor 200 may be implemented as a transistor in which the resistance value between the drain and the source varies according to the gate voltage. At this time, the gate voltage of the transistor may be controlled to operate in an ohmic region, and the gate voltage may be controlled according to a signal applied from the subtle controller 300 described later.

The variable resistor 200 may be connected in series with at least one of the first reactance element 110 and the second reactance element 120. In FIG. 1, the variable resistor 200 is illustrated as being connected to the first reactance element 110, but may alternatively be connected to the second reactance element 120, or, the first reactance element 110 and the second Each of the reactance elements 120 may be connected.

The variable resistor 200 adjusts the resistance value to disperse the currents flowing through the first reactance element 110 and the second reactance element 120, thereby reacting by the first reactance element 110 and the second reactance element 120. Can be varied. A detailed description in this regard will be described later with reference to FIGS. 2 and 3.

The floating controller 300 is a linear or nonlinear controller, and may generate resistance value information of the variable resistor 200 for generating a target reactance in a feedback control method.

To this end, the floating controller 300 may detect predetermined electrical parameters corresponding to the element associated with the reactance value from the first reactance element 110 and the second reactance element 120. The floating controller 300 may be connected to the first reactance element 110 and the second reactance element 120 directly or indirectly, or directly or indirectly to the power conversion system to detect various electrical parameters.

For example, the floating controller 300 may include at least one of voltage, current, phase, and magnitude observed at a predetermined portion of the first reactance element 110, second reactance element 120, or circuit element constituting the power conversion system. Electrical parameters including one can be detected.

The variable controller 300 can receive the target parameter from the outside, calculates an error by comparing the detected electrical parameter with the target parameter, and uses the calculated error to vary the resistance 200 required for tracking the target parameter It is possible to generate the resistance value information. That is, the poor controller 300 sets the target parameter as a reference value, and allows the currently measured electrical parameter to follow the reference value. Real-time calculation of errors between each other and generation of resistance value information to offset the error may be generated. .

For example, the resistance value information may correspond to the gate voltage (or current) of the variable resistor 200 implemented by a transistor.

The negative controller 300 may apply a signal corresponding to the resistance value information to the variable resistor 200 to control the resistance value for generating a target reactance from the variable resistor 200. That is, the sub-controller 300 may control the resistance of the variable resistor 200 by a feedback control method, thereby ultimately controlling the reactance value by the first reactance element 110 and the second reactance element 120. have.

FIG. 2 is a circuit diagram illustrating an example in which the reactance element illustrated in FIG. 1 is provided as an inductor, and FIG. 3 is a circuit diagram illustrating an example in which the reactance element illustrated in FIG. 1 is provided as a capacitor.

The first reactance element 110 and the second reactance element 120 shown in FIG. 1 are implemented with the first inductor 110 and the second inductor 120, respectively, as shown in FIG. 2, together with the variable resistor 200. To form a variable reactance element of, or implemented as a first capacitor 150 and a second capacitor 160 as shown in FIG. 3, one variable reactance element may be formed together with the variable resistor 200.

Referring to FIG. 2, the first inductor 110 and the second inductor 120 may be connected in parallel, and the variable resistor 200 may be connected in series with the first inductor 110.

The impedance of the variable reactance element formed as shown in FIG. 2 is divided into an inductive reactance by the first inductor 110 and the second inductor 120 and a resistance by the variable resistor 200, as shown in Equation 1 below.

In Equation 1, L ₁ is the inductance of the first inductor 110, L ₂ is the inductance of the second inductor 120, and R is the resistance of the variable resistor 200.

When the variable resistance 200 generates a sufficiently large resistance value, for example, a maximum resistance value within a variable resistance range, current may flow only to the second inductor 120. Accordingly, the equivalent reactance by the first inductor 110 and the second inductor 120 connected in parallel may be substantially changed to a single reactance by the second inductor 120.

When the variable resistance 200 generates a sufficiently small resistance value, for example, a resistance value close to 0, current may flow through the first inductor 110 and the second inductor 120. In this case, the equivalent reactance by the first inductor 110 and the second inductor 120 connected in parallel may have a low reactance as compared with the case where the variable resistor 200 generates a sufficiently large resistance value.

Referring to FIG. 3, the first capacitor 150 and the second capacitor 160 may be connected in parallel, and the variable resistor 200 may be connected in series with the first capacitor 150.

The impedance of the variable reactance element formed as shown in FIG. 3 is divided into the capacitance reactance by the first capacitor 150 and the second capacitor 160 and the resistance by the variable resistor 200, which is as shown in Equation 2 below.

In Equation 2, C ₁ denotes the capacitance of the first capacitor 150, C ₂ denotes the capacitance of the second capacitor 160, and R denotes the resistance of the variable resistor 200.

When the variable resistor 200 generates a sufficiently large resistance value, for example, a maximum resistance value within a variable resistance range, current may flow only to the second capacitor 160. Accordingly, the equivalent reactance by the first capacitor 150 and the second capacitor 160 connected in parallel can be substantially changed to a single reactance by the second capacitor 160.

When the variable resistor 200 generates a sufficiently small resistance value, for example, a resistance value close to 0, current may flow through the first capacitor 150 and the second capacitor 160. In this case, the equivalent reactance by the first capacitor 150 and the second capacitor 160 connected in parallel may have a high reactance compared to the case where the variable resistor 200 generates a sufficiently large resistance value.

On the other hand, the reactance variable device using a variable resistance according to another embodiment of the present invention, compared to the reactance variable device using a variable resistance according to an embodiment of the present invention shown in Figure 1, a plurality of reactance elements are connected in series , The variable resistor is different in that it is connected in parallel with at least one of the plurality of reactance elements, and the other features are the same. Therefore, only the characteristics of one variable reactance element formed by a plurality of reactance elements and variable resistors will be described, and descriptions of other components, such as a floating controller, will be replaced with those described above.

4 is a circuit diagram illustrating an example in which a reactance element is provided as an inductor in a reactance variable device using a variable resistor according to another embodiment of the present invention, and FIG. 5 is a variable circuit according to another embodiment of the present invention. It is a circuit diagram showing an example in which a reactance element is provided as a capacitor in a reactance variable device.

Referring to FIG. 4, the first inductor 110 and the second inductor 120 may be connected in series, and the variable resistor 200 may be connected in parallel to the second inductor 120.

When the variable resistance 200 generates a specific resistance value within the variable resistance range, the current having the same size as the current applied to the first inductor 110 is distributed to the second inductor 120 and the variable resistance 200 Can flow. In this case, reactance by the first inductor 110 and the second inductor 120 connected in series may occur.

When the variable resistance 200 generates a sufficiently small resistance value, for example, a resistance value of 0, a current having the same size as the current applied to the first inductor 110 flows only toward the variable resistance 200, in series The reactance by the connected first inductor 110 and the second inductor 120 may be substantially changed to a single reactance by the first inductor 110.

That is, the variable resistor 200 may change the resistance value so that no current is applied to the second inductor 120 connected in parallel to vary the reactance by the first inductor 110 and the second inductor 120.

Referring to FIG. 5, the first capacitor 150 and the second capacitor 160 may be connected in series, and the variable resistor 200 may be connected in parallel with the second capacitor 160.

When the variable resistor 200 generates a specific resistance value within the variable resistance range, the current having the same size as the current applied to the first capacitor 150 is distributed to the second capacitor 160 and the variable resistor 200 Can flow. In this case, reactance by the first capacitor 150 and the second capacitor 160 connected in series may occur.

When the variable resistor 200 generates a sufficiently small resistance value, for example, a resistance value of 0, a current having the same size as the current applied to the first capacitor 150 flows only toward the variable resistor 200, in series The reactance by the connected first capacitor 150 and the second capacitor 160 may be substantially changed to a single reactance by the first capacitor 150.

That is, the variable resistor 200 may change the resistance value so that no current is applied to the second capacitor 160 connected in parallel to change the reactance by the first capacitor 150 and the second capacitor 160.

As described above, the reactance variable device 1000 using the variable resistance of the present invention can generate a desired reactance value within a variable range of a reactance element by using a characteristic in which a current flow is distributed according to a resistance value in a parallel connection structure. have. Here, the variable range of the reactance element may be a range between a single reactance by any one of the plurality of reactance elements and a reactance element connected in parallel or a reactance by a plurality of reactance elements connected in series.

Accordingly, the reactance variable device 1000 using the variable resistance of the present invention can minimize its own power consumption for variable reactance, and when applied to a power conversion system, generates a reactance that can optimize the performance of the system. And continuous reactance variable.

Hereinafter, a control method of the reactance variable device 1000 using the variable resistor of the present invention will be described with reference to FIG. 6.

6 is a flowchart of a control method of a reactance variable device using the variable resistance of the present invention.

Referring to FIG. 6, the subtle controller 300 may detect electrical parameters from a plurality of reactance elements 110 and 120 (S10).

The floating controller 300 is directly or indirectly connected to the first reactance element 110 or the second reactance element 120, or includes the first reactance element 110 and the second reactance element 120 as circuit elements. It can be directly or indirectly connected to a system to detect electrical parameters corresponding to elements associated with reactance values. For example, the electrical parameter may include at least one of voltage, current, phase, and magnitude observed in the first reactance element 110 or the second reactance element 120.

The poor controller 300 may calculate an error between the detected electrical parameter and the target parameter (S20), and generate resistance value information of the variable resistor 200 using the calculated error (S30).

The poor controller 300 may receive a target parameter from the outside. For example, the target parameter may be a parameter corresponding to an element associated with a reactance value required by the power conversion system.

The sub-controller 300 sets the target parameter as a reference value, and causes the detected electrical parameter to follow the reference value. Real-time calculation of mutual errors and resistance value information for offsetting errors may be generated.

The poor controller 300 may adjust the resistance value of the variable resistor 200 using the resistance value information (S40).

The negative controller 300 may apply a signal corresponding to the resistance value information to the variable resistor 200 to control the resistance value for generating a target reactance from the variable resistor 200. That is, the sub-controller 300 may control the resistance of the variable resistor 200 by the feedback control method, ultimately controlling the reactance value by the first reactance element 110 and the second reactance element 120. have.

Although described above with reference to embodiments, those skilled in the art understand that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. Will be able to.

[Description of codes]

1000: Reactance variable device using variable resistance

110: first reactance element

120: second reactance element

200: variable resistance

300: poor controller

Claims

A plurality of reactance elements connected in parallel; And

Variable including a variable resistance connected in series with at least one reactance element among the plurality of reactance elements, and varying a reactance by the plurality of reactance elements by dispersing a current flowing through the plurality of reactance elements according to a change in resistance value Reactance variable device using resistance.
According to claim 1,

A reactance variable device using a variable resistor further comprising a subtle controller that generates resistance value information of the variable resistor for generating a target reactance by a feedback control method.
According to claim 2,

The ugly controller,

Detecting an electrical parameter from the plurality of reactance elements, comparing the electrical parameter with a target parameter to calculate an error, and using the calculated error to generate resistance value information of the variable resistor required to follow the target parameter Reactance variable device using variable resistance.
According to claim 1,

The variable resistance,

A reactance variable device using a variable resistor implemented as a transistor in which a resistance value between a drain and a source varies according to a gate voltage.
According to claim 4,

A reactance variable device using a variable resistor further comprising a subtle controller that generates information on the gate voltage for generating a target reactance in a feedback control method and applies the information on the gate voltage to the variable resistor.
The method of claim 5,

The ugly controller,

A reactance variable device using a variable resistor that controls the gate voltage so that the transistor can operate in an ohmic region.
According to claim 1,

The plurality of reactance elements,

A reactance variable device using a variable resistance that generates a reactance varying within a range between reactance by the plurality of reactance elements connected in parallel and reactance by any one of the reactance elements connected in series among the plurality of reactance elements.
A plurality of reactance elements connected in series; And

Variable including a variable resistance connected in parallel with at least one reactance element among the plurality of reactance elements, and changing the reactance by the plurality of reactance elements by preventing current from being distributed to the reactance elements connected in parallel according to a change in resistance value. Reactance variable device using resistance.
The method of claim 8,

A reactance variable device using a variable resistor further comprising a subtle controller for generating resistance value information of the variable resistor for generating a target reactance in a feedback control method.
In the control method of a reactance variable device capable of varying the reactance by a plurality of reactance elements connected in parallel,

Detecting electrical parameters from the plurality of reactance elements;

Calculating an error between the electrical parameter and a target parameter;

Generating resistance value information of a variable resistor connected to at least one reactance element among the plurality of reactance elements using an error calculated to follow the target parameter; And

And changing the resistance value of the variable resistance using the resistance value information so that currents flowing through the plurality of reactance elements can be distributed by the variable resistance.