KR20230090545A - Device and method for providing lagging reactive power to a power system in a magnetically controlled manner - Google Patents

Abstract

The present disclosure relates to an apparatus and method for supplying terrestrial reactive power to a power system in a magnetic field control manner. The method includes measuring an output voltage of a primary winding side of a magnetic field control reactor; calculating an output current on the primary winding side of the magnetic field control reactor based on firing angles of the first thyristor and the second thyristor; calculating a reactive power value generated in the magnetic field control reactor based on the output voltage and the output current; Comparing the generated reactive power value with a set target reactive power value; and adjusting the DC current of the secondary winding to reach a target reactive power value set from the generated reactive power value. The DC current of the secondary winding may be adjusted by controlling firing angles of the first thyristor and the second thyristor. According to the present disclosure, since the DC current of the secondary winding is adjusted through the phase control of the thyristor, it is possible to implement the low voltage operation of the thyristor, and a magnetic field control reactor is obtained by using only a voltage sensor without applying an expensive current sensor for extra high voltage. There is an effect that can control.

Description

DEVICE AND METHOD FOR PROVIDING LAGGING REACTIVE POWER TO A POWER SYSTEM IN A MAGNETICALLY CONTROLLED MANNER}

The present disclosure relates to a magnetic field controlled reactor, and more particularly, to a device for supplying ground reactive power to a power system in a magnetic field controlled manner.

In operating the power system, ground reactive power due to inductive loads applied to the system and phase-leading reactive power due to long-distance lines and capacitive loads applied to the system may occur, and these reactive power are the power in the power system quality may deteriorate. Accordingly, in order to solve the power quality problem in the power system, the development and supply of Flexible AC Transmission System (FACTS) facilities using power electronic devices are being actively performed.

Among the reactive power compensation methods using these power electronic devices, a conventionally widely used method is a TCR (Thyristor Controlled Reactor) method in which a reactor is varied using a thyristor valve. In this TCR method, since the thyristor valve is directly connected to a high-voltage or extra-high voltage power system, it is difficult to design and manufacture insulation and heat dissipation of the thyristor valve, and the manufacturing cost is also very high. In addition, since the TCR method generates reactive power by adjusting the current through phase control, a large amount of harmonics may be generated, which may cause failure of other devices and protection facilities in the same busbar. In addition, since the reactor in the TCR method has a single winding structure, vibration and noise may be greatly generated during operation.

Therefore, there is a demand for development of a power system that enables continuous and stable reactive power control while solving the above problems.

An object of the present disclosure to solve this problem is to provide a device for supplying ground reactive power to a power system in a magnetic field control method.

According to one embodiment of the present disclosure, an apparatus for supplying terrestrial reactive power in a magnetic field control manner is provided. The device includes a magnetic field control reactor (MCR) including a primary winding and a secondary winding, wherein the primary winding is connected in parallel with the power system; a voltage sensor (PT) for measuring the output voltage of the primary winding side of the magnetic field control reactor; and a control unit configured to adjust the DC current of the secondary winding so that ground reactive power corresponding to the DC current of the secondary winding is generated in the primary winding of the magnetically controlled reactor. The magnetic field control reactor may include a first thyristor connected to the secondary winding and a second thyristor connected to the secondary winding in anti-parallel to the first thyristor. The controller may be configured to adjust the DC current of the secondary winding by controlling firing angles of the first thyristor and the second thyristor. The control unit may be configured to calculate an output current of the primary winding side of the magnetic field control reactor based on the firing angle, and to calculate a reactive power value generated in the magnetic field control reactor based on the output voltage and the output current. can

In addition, the magnetic field control reactor may include both side yorks, and the primary winding and the secondary winding may be disposed on each york. The first thyristor may be connected to the secondary winding of one plinth, and the second thyristor may be connected to the secondary winding of the other plinth.

In addition, the magnetic field control reactor may further include a diode connected between the secondary winding of the one main pole and the secondary winding of the other main pole. The diode may provide a path through which an inductive current may flow when the first thyristor or the second thyristor is turned off.

In addition, the control unit calculates a DC current generated in the secondary winding of the magnetic field control reactor based on the firing angle and calculates an output current on the primary winding side of the magnetic field control reactor based on the calculated DC current. can be configured.

In addition, the control unit may be configured to adjust the DC current of the secondary winding to reach a target reactive power value set from the reactive power value generated in the magnetic field control reactor.

In addition, the control unit adjusts the DC current of the secondary winding by increasing or decreasing the firing angle by a predetermined phase, and repeats the adjustment until the generated reactive power value reaches the set target reactive power value. can be configured to

According to one embodiment of the present disclosure, a method for supplying ground reactive power using a reactive power supply device including a magnetic field control reactor (MCR) is provided. The method includes measuring an output voltage on a primary winding side of the magnetic field control reactor - the magnetic field control reactor includes the primary winding, a secondary winding, a first thyristor, and a second thyristor, and the primary winding is connected in parallel with the power system, the first thyristor is connected to the secondary winding, the second thyristor is connected to the secondary winding in anti-parallel with the first thyristor, and the output on the primary winding side voltage is measured by voltage sensor (PT) -; calculating an output current on a primary winding side of the magnetic field control reactor based on firing angles of the first thyristor and the second thyristor; calculating a reactive power value generated in the magnetic field control reactor based on the output voltage and the output current; Comparing the generated reactive power value with a set target reactive power value; and adjusting the DC current of the secondary winding to reach a target reactive power value set from the generated reactive power value. The DC current of the secondary winding may be adjusted by controlling firing angles of the first thyristor and the second thyristor.

According to the present disclosure, since the current of the secondary winding is controlled compared to the conventional thyristor-controlled reactor, the thyristor valve can be applied at low pressure, and the current flows through the thyristor and the loss is small, so the insulation and heat dissipation design and manufacture of the thyristor valve There is an effect that can be easily performed at a reduced cost.

In addition, according to the present disclosure, by calculating the output current on the primary winding side based on the thyristor phase angle, it is possible to control the magnetic field control reactor using only a voltage sensor without applying an expensive extra-high voltage current sensor. .

In addition, according to the present disclosure, since the target reactive power of the primary winding is generated by adjusting the DC current of the secondary winding through phase control of the thyristor, the generation of harmonics can be reduced to minimize adverse effects on other facilities in the busbar. There is an effect.

In addition, according to the present disclosure, since the structure of the reactor has a two-winding structure similar to that of a transformer, it is possible to implement a reactive power compensation device with reduced vibration and noise.

1 is an exemplary conceptual diagram showing the basic principle of a magnetic field control reactor.
2A and 2B are graphs showing the amount of current generated in the primary winding according to the DC current generated in the secondary winding of the magnetic field control reactor.
3 is an exemplary diagram showing the configuration of a magnetic field control reactor for supplying reactive power according to an embodiment of the present disclosure.
4 is an exemplary diagram illustrating that a magnetic field control reactor according to an embodiment of the present disclosure provides reactive power to a power system.
5 is an exemplary diagram illustrating an apparatus for supplying reactive power to a power system in a magnetic field control method according to an embodiment of the present disclosure.
6 is an exemplary flowchart illustrating a method for supplying reactive power to a power system in a magnetic field control method according to an embodiment of the present disclosure.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Various aspects of the invention are described below. It is to be understood that the inventions presented herein may be embodied in a wide variety of forms and that any specific structure, function, or all presented herein is illustrative only. Based on the inventions presented herein, a person skilled in the art to which the present invention pertains knows that one aspect presented herein can be implemented independently of any other aspects, and that two or more such aspects can be implemented in various ways. It will be understood that it can be combined with For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, such an apparatus may be implemented or such a method may be practiced using a structure, function, or structure and function in addition to or other than one or more aspects set forth herein.

The present disclosure relates to a technology capable of continuously providing ground free power to a power system using a magnetically controlled reactor (MCR).

1 is an exemplary conceptual diagram showing the basic principle of a magnetic field control reactor.

)을 발생시킬 수 있으며, DC 오프셋으로 인해 철심의 자화가 포화 영역으로 도달하게 되면 정상 영역과 대비하여 1차권선에서 발생하는 전류의 증폭을 가능하게 할 수 있다.As illustrated in FIG. 1 , the magnetically controlled reactor may be defined in a form similar to a transformer in which a primary winding and a secondary winding are wound around an iron core. Basically, a transformer has the property of reactance, and when an alternating current (AC) voltage is generated in one winding (eg, secondary winding) through a shared iron core, the other winding (eg, For example, the primary winding) can also generate an AC voltage. On the other hand, unlike a transformer, a magnetically controlled reactor allows direct current (DC) current (DC source E in FIG. 1) to flow in the secondary winding, thereby reducing the DC offset (

), and when the magnetization of the iron core reaches the saturation region due to the DC offset, it is possible to amplify the current generated in the primary winding compared to the normal region.

2A and 2B are graphs showing the amount of current generated in the primary winding according to the DC current generated in the secondary winding of the magnetic field control reactor. Here, FIG. 2a shows a graph of magnetomotive force (Hl) and magnetic flux (Φ) when the DC current generation value in the secondary winding is '0', and FIG. 2B shows a graph when the DC current generation value in the secondary winding is '0'. When not, graphs of magnetomotive force (Hl) and magnetic flux (Φ) are shown.

), 자계는 포화되지 않아 1차권선에 약간의 지상 전류를 공급하게 된다. 그러나, 도 1 및 도 2b에서와 같이, 2차권선 내 DC 전류가 발생하면(즉,

) 리액터의 철심은 포화되고 1차권선에 발생하는 지상 전류가 크게 포화되는 것을 확인할 수 있다.As in FIG. 2A, if the DC current generation value in the secondary winding is '0' (ie,

), the magnetic field is not saturated and supplies some lagging current to the primary winding. However, as in FIGS. 1 and 2B, when a DC current occurs in the secondary winding (i.e.,

) It can be seen that the iron core of the reactor is saturated and the ground current generated in the primary winding is greatly saturated.

Specifically, when a DC offset of magnetic flux is generated by flowing a DC current in the secondary winding, the magnetic flux (Φ) of the magnetic field control reactor can be expressed as:

은 정현파 진폭이고, w는 각속도이고,

는 자속의 DC 오프셋이다.here,

is the sinusoidal amplitude, w is the angular velocity,

is the DC offset of the magnetic flux.

The voltage (e) induced in the secondary winding depending on the magnetic flux can be expressed as:

Here, N is the number of turns of the secondary winding.

As in the above formula, when DC current is generated in the secondary winding, there is no change with time, so the voltage induced in the secondary side is not affected. However, in a magnetic circuit, the magnetic permeability (μ) changes and has a saturation characteristic, so the relationship between the magnetomotive force (Hl) and the magnetic flux (Φ) has a non-linearity. Expressing this nonlinear relationship as a function is:

Here, H is the strength of the magnetic field (ie, magnetic field), and H1 is the magnetomotive force, equal to the current flowing as a line integral with respect to H.

The magnetomotive force (Hl) may occur with respect to the current values of the AC component and the DC component, and may be expressed as:

는 AC 전류에 기인하는 기자력 성분이고,

는 DC 전류에 기인하는 기자력 성분이다.here,

is the magnetomotive force component due to the AC current,

is the magnetomotive component due to the DC current.

As shown in the above equation and FIG. 2B, since the intensity of the magnetic field caused by the DC current is not zero and is offset in the positive direction, it can be confirmed that the magnetic field is saturated according to the magnetic flux generated in the secondary winding. At this time, the current generated in the primary winding according to the generated magnetic field shows a rapid current amplification compared to a constant increase in the corresponding saturation region. As described above, for these nonlinear characteristics, the voltage induced in the secondary and the DC current flowing in the secondary winding can be calculated by the formula, and the magnetic flux generated thereby and the peak value of the current flowing in the primary side are also calculated. calculation is possible

3 is an exemplary diagram showing the configuration of a magnetic field control reactor for supplying reactive power according to an embodiment of the present disclosure.

As shown in FIG. 3, the magnetic field control reactor according to the present disclosure may configure two windings (ie, a primary winding and a secondary winding) of a transformer structure on both sides of the york, and one of the current The current is amplified when the value is positive, and the other is configured so that the current is amplified when the value is negative. As these two currents are combined, the output current can have the form of an AC wave, and N ₂ /N ₁ , which is the reciprocal of the turns ratio, on the primary winding side compared to the AC current value generated in the secondary winding (where N ₁ is the primary winding and N ₂ is the number of secondary windings), a much higher amplified current value can be obtained.

1 to 3, the magnetic field control reactor according to the present disclosure can generate an amplified current in the primary winding by additionally generating a DC current in the secondary winding, and the current is inductive. As a current, the magnetic field control reactor can supply ground reactive power to the power grid.

The magnetic field control reactor as shown in FIG. 3 may be installed in parallel to the power system, and in the case of a three-phase power system, magnetic field control reactors may be connected in parallel to each phase. The number of windings per phase may be designed as a predetermined number (eg, 8) capable of generating DC current in the secondary winding through control of the thyristors 310 and 320 . The thyristors 310 and 320 may be connected in a secondary winding and may be connected in anti-parallel to form a thyristor valve. For example, the thyristor 310 may be connected to the secondary winding of one plinth (e.g., the left plinth in FIG. 3), and the thyristor 320 may be connected to the secondary winding of the other plinth (e.g., the right plinth in FIG. 3). Plinth) can be connected to the secondary winding.

In addition, a diode 330 may be connected between the secondary windings of both plinths to provide a path through which an inductive current may flow when the thyristor 310 or 320 is turned off. The connection direction of the diode 330 may be connected in a forward direction from the left plinth to the right plinth as shown in FIG. 3 or in a reverse direction, depending on the embodiment.

4 is an exemplary diagram illustrating that a magnetic field control reactor according to an embodiment of the present disclosure provides reactive power to a power system.

As shown in FIG. 4, the magnetic field control reactor according to the present disclosure is configured to provide ground reactive power to the power system 200 by being connected in parallel to the power system 200 of high voltage or extra-high voltage, such as 22.9 kV. It can be. To this end, the AC-DC converter 400 for supplying DC current including the thyristors 310 and 320 may generate DC current in the secondary winding, and the target side of the primary winding connected to the power system 200. DC current generated in the secondary winding may be adjusted through phase control of the thyristors 310 and 320 so as to generate ground reactive power.

5 is an exemplary diagram illustrating an apparatus for supplying reactive power to a power system in a magnetic field control method according to an embodiment of the present disclosure.

As shown in FIG. 5, an apparatus for supplying reactive power by a magnetic field control method according to the present disclosure includes a magnetic field control reactor 500, a controller 550, a human machine interface (HMI) 560, a voltage sensor ( A Potential Transformer (PT) 510 may be included.

The primary winding of the magnetic field control reactor 500 may be connected in parallel to the power system 200 through which high or extra-high voltage flows. As described above, when a DC current is generated in the secondary winding of the magnetic field control reactor 500, the iron core of the magnetic field control reactor 500 is saturated and the ground current generated in the primary winding can be greatly amplified. The ground reactive power generated in the primary winding in response to the DC current generated in the secondary winding may be calculated or estimated as described with respect to FIGS. 1 to 3 .

As shown in FIGS. 3 and 5 , the magnetic field control reactor 500 may be configured in a form in which a primary winding and a secondary winding are disposed on both pedestals, respectively. The magnetic field control reactor 500 may include a first thyristor 310 and a second thyristor 320 . The first thyristor 310 may be connected to the secondary winding of one plinth (eg, the left plinth), and the second thyristor 320 may be connected in anti-parallel to the first thyristor 310 to the other plinth (eg, the left plinth). For example, it can be connected to the secondary winding of the right plinth). In addition, the magnetic field control reactor 500 may include a diode 330 connected between the secondary winding of one main pole and the secondary winding of the other main pole. The diode 330 may provide a path through which an inductive current may flow when the first thyristor 310 and/or the second thyristor 320 are turned off, and may be connected in a forward or reverse direction depending on implementation.

The control unit 550 may be configured to adjust the DC current of the secondary winding so that ground reactive power corresponding to the direct current (DC) current generated in the secondary winding is generated in the primary winding of the magnetically controlled reactor 500. . The voltage sensor (PT) 510 may measure the output voltage on the primary winding side of the magnetic field control reactor 500 connected to the power system 200 and provide the measured output voltage to the control unit 550 .

The reactive power supply device of the present disclosure does not include a current sensor (CT: Current Transformer), and as will be described later, the output current on the primary winding side of the magnetic field control reactor 500 is the thyristor of the magnetic control reactor 500. It can be calculated based on the phase angles (ie, firing angles) of (310, 320). In the case of a configuration having both a voltage sensor (PT) and a current sensor (CT) to measure the output voltage and output current on the primary winding side, if the power system 200 is three-phase, the voltage sensor (PT) for each phase ) and current sensors (CT), a total of three voltage sensors (PT) and three current sensors (CT) are required. However, since the reactive power supply device of the present disclosure can control the magnetic field control reactor 500 by calculating the output current on the primary winding side without the current sensor CT, 3 for the three-phase power system 200 It may be implemented to include only two voltage sensors (PT). Since current sensors (CT) for high or extra-high voltage are expensive as well as devices having large weight and volume, the present disclosure through this implementation provides a reactive power supply device that is area efficient and simple to design while greatly reducing cost. be able to provide

The HMI 560 is a device through which the operator can set the system, monitor the system status, and control the system, and is connected to the control unit 550 through a predetermined communication network (for example, a communication network applied to the corresponding facility such as RS-485). can Also, the HMI 560 may predict or set a target reactive power value to be compensated for in the power system and monitor the power system.

The control unit 550 may include a central processing unit (CPU), a driving unit, and a voltage detection unit. The CPU may control each unit of the controller 550 and perform a reactive power compensation operation. Depending on implementation, the central processing unit may be added to or integrated with other processing units such as a field programmable gate array (FPGA). The driving unit controls the phase of the first thyristor 310 and/or the second thyristor 320 (i.e., firing angle) so that the DC current of the secondary winding of the self-controlled reactor 500 can be adjusted under the control of the control unit 550. control) can be performed. The voltage detector may receive an output voltage from the voltage sensor 510 and transmit it to the controller 550 .

The control unit 550 may calculate the output current on the primary winding side of the magnetic field control reactor 500 based on the firing angles of the thyristors 310 and 320 . First, the control unit 550 may calculate the DC current generated in the secondary winding of the magnetic field control reactor 500 based on the firing angle, and based on the calculated DC current, the primary winding side of the magnetic field control reactor 500 The output current of can be calculated. Such calculations or predictions may be made as described above with respect to FIGS. 1-4.

The control unit 550 may calculate a reactive power value generated in the magnetic field control reactor 500 based on the measured output voltage and the calculated output current. The controller 550 may be configured to adjust the DC current of the secondary winding of the magnetic field control reactor 500 to reach a set target reactive power value from the generated reactive power value. For example, when the generated terrestrial reactive power value is 3MVAR and the target terrestrial reactive power value is 5MVAR, the controller 550 controls the secondary winding of the magnetically controlled reactor 500 to further generate 2MVAR terrestrial reactive power. of DC current can be adjusted.

In one implementation, the control unit 550 controls the first thyristor 310 and/or the first thyristor 310 by a predetermined phase (eg, one degree, etc.) to adjust the DC current in the secondary winding of the magnetically controlled reactor 500. 2 The firing angle of the thyristor 320 may be increased or decreased. In addition, the control unit 550 may repeat the above-described DC current adjustment operation of the secondary winding until the reactive power value generated in the self-controlled reactor 500 reaches the set target reactive power value.

For example, the control unit 550 increases the firing angle of the thyristors 310 and 320 by a predetermined phase when the set target reactive power value is greater than the reactive power value generated by the self-controlling reactor 500, and generates it again. By repeating an operation of comparing the generated reactive power value with the target reactive power value, the generated reactive power value may be controlled to approach the target reactive power value. In addition, for example, the controller 550 reduces the firing angle of the thyristors 310 and 320 by a predetermined phase when the set target reactive power value is smaller than the reactive power value generated in the self-controlled reactor 500 By repeating an operation of comparing the generated reactive power value with the target reactive power value, the generated reactive power value may be controlled to approach the target reactive power value.

Through this configuration, according to the present disclosure, since reactive power is generated on the primary winding side connected to the power system by adjusting the DC current of the secondary winding through phase control of the thyristor, the thyristor is applied to the high-voltage power system. It can operate at low voltage without being connected, enabling low-current and low-loss operation and reducing harmonics. Through this, it is possible to easily design and manufacture insulation and heat dissipation of the thyristor valve at a reduced cost, and it is possible to minimize adverse effects of harmonics on other facilities in the busbar. In addition, according to the present disclosure, by calculating the output current on the primary winding side based on the thyristor phase angle, it is possible to control the magnetic field control reactor using only a voltage sensor without applying an expensive extra-high voltage current sensor. . In addition, according to the present disclosure, since the structure of the reactor has a two-winding structure similar to that of a transformer, it is possible to implement a reactive power compensation device with reduced vibration and noise.

6 is an exemplary flowchart illustrating a method for supplying reactive power to a power system in a magnetic field control method according to an embodiment of the present disclosure.

This method may be performed by the reactive power supply device including the magnetic field control reactor 500, the control unit 550, and the voltage sensor (PT) 510 as described above. As shown in FIG. 6, the control unit 550 may measure the output voltage on the primary winding side of the magnetic field control reactor 500 (610). The control unit 550 may calculate the output current on the primary winding side of the magnetic field control reactor 500 based on the phase angles (ie, firing angles) of the thyristors 310 and 320 (620). The controller 550 may calculate a reactive power value generated in the magnetic field control reactor 500 based on the measured output voltage and the calculated output current (630). The controller 550 may compare the generated reactive power value with the set target reactive power value (640). The control unit 550 may adjust the DC current of the secondary winding of the magnetic field control reactor 500 to reach a set target reactive power value from the generated reactive power value (650).

As described above, the DC current of the secondary winding can be adjusted by controlling the firing angles of the first thyristor 310 and the second thyristor 320 . The control unit 550 can adjust the DC current of the secondary winding by increasing or decreasing the firing angles of the first thyristor 310 and the second thyristor 320 by a predetermined phase, and the generated magnetic field control reactor 500 The firing angle may be increased or decreased repeatedly until the reactive power value reaches a set target reactive power value.

The description of the presented embodiments is provided to enable any person skilled in the art to use or practice the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments without departing from the scope of the present invention. Thus, the present invention is not to be limited to the embodiments presented herein, but is to be construed in the widest scope consistent with the principles and novel features presented herein.

200: power system
310, 320: thyristor
330: diode
400: AC-DC converter
500: magnetic field control reactor
510: voltage sensor (PT)
550: control unit
560: HMIs

Claims (8)

As a device for supplying terrestrial reactive power in a magnetic field control method,
A magnetic field control reactor (MCR) including a primary winding and a secondary winding, wherein the primary winding is connected in parallel with the power system;
a voltage sensor (PT) for measuring the output voltage of the primary winding side of the magnetic field control reactor; and
And a controller configured to adjust a DC current of the secondary winding so that ground reactive power corresponding to a direct current (DC) current of the secondary winding is generated in the primary winding of the magnetically controlled reactor,
The magnetic field control reactor includes a first thyristor connected to the secondary winding and a second thyristor connected to the secondary winding in anti-parallel with the first thyristor,
The control unit is configured to adjust the DC current of the secondary winding by controlling firing angles of the first thyristor and the second thyristor,
The controller is configured to calculate an output current on the primary winding side of the magnetic field control reactor based on the firing angle, and to calculate a reactive power value generated in the magnetic field control reactor based on the output voltage and the output current. ,
A device for supplying terrestrial reactive power by means of magnetic field control. According to claim 1,
The magnetic field control reactor includes both side yorks, and the primary winding and the secondary winding are disposed on each york,
The first thyristor is connected to the secondary winding of one plinth, and the second thyristor is connected to the secondary winding of the other plinth.
A device for supplying terrestrial reactive power by means of magnetic field control. According to claim 2,
The magnetic field control reactor further includes a diode connected between the secondary winding of the one main pole and the secondary winding of the other pole,
The diode provides a path through which the inductive current can flow when the first thyristor or the second thyristor is off.
A device for supplying terrestrial reactive power by means of magnetic field control. According to claim 1,
The controller calculates a DC current generated in the secondary winding of the magnetic field control reactor based on the firing angle and calculates an output current on the primary winding side of the magnetic field control reactor based on the calculated DC current. ,
A device for supplying terrestrial reactive power by means of magnetic field control. According to claim 4,
The controller is configured to adjust the DC current of the secondary winding to reach a target reactive power value set from the reactive power value generated in the magnetic field control reactor.
A device for supplying terrestrial reactive power by means of magnetic field control. According to claim 5,
The control unit adjusts the DC current of the secondary winding by increasing or decreasing the firing angle by a predetermined phase, and is configured to repeat the adjustment until the generated reactive power value reaches the set target reactive power value. felled,
A device for supplying terrestrial reactive power by means of magnetic field control. A method for supplying ground reactive power using a reactive power supply device comprising a magnetic field control reactor (MCR), comprising:
Measuring the output voltage on the primary winding side of the magnetic field control reactor - the magnetic field control reactor includes the primary winding, the secondary winding, the first thyristor and the second thyristor, and the primary winding is connected to the power system connected in parallel, the first thyristor is connected to the secondary winding, the second thyristor is connected to the secondary winding in antiparallel with the first thyristor, and the output voltage on the side of the primary winding is a voltage sensor Measured by (PT) -;
calculating an output current on a primary winding side of the magnetic field control reactor based on firing angles of the first thyristor and the second thyristor;
calculating a reactive power value generated in the magnetic field control reactor based on the output voltage and the output current;
Comparing the generated reactive power value with a set target reactive power value; and
adjusting the DC current of the secondary winding to reach a target reactive power value set from the generated reactive power value;
The DC current of the secondary winding is adjusted by controlling the firing angle of the first thyristor and the second thyristor.
A method for supplying terrestrial reactive power. According to claim 7,
Adjusting the DC current of the secondary winding,
increasing or decreasing the firing angle by a predetermined phase; and
Repeating the increase or decrease of the firing angle until the generated reactive power value reaches the set target reactive power value,
A method for supplying terrestrial reactive power.

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