KR20160120984A - A system and a method for controlling the current of field windings - Google Patents

A system and a method for controlling the current of field windings Download PDF

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KR20160120984A
KR20160120984A KR1020150050300A KR20150050300A KR20160120984A KR 20160120984 A KR20160120984 A KR 20160120984A KR 1020150050300 A KR1020150050300 A KR 1020150050300A KR 20150050300 A KR20150050300 A KR 20150050300A KR 20160120984 A KR20160120984 A KR 20160120984A
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generator
current
field winding
controlling
command
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KR1020150050300A
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KR101680964B1 (en
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장재영
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두산중공업 주식회사
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/006—Means for protecting the generator by using control
    • Y02E40/62—

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  • Control Of Eletrric Generators (AREA)

Abstract

The present invention relates to a system and method for controlling current in a field winding of a generator, the system comprising: a power selection unit connected to an output of an exciter and an output of the generator, the system controlling a current of a field winding of a generator; A rectifier for converting an AC current input from the power source selection unit into a DC current through phase control; A field sensor for detecting a current and a voltage state of the field winding; And a controller for determining the state of the generator based on the detection result of the field sensor, transmitting a power selection command to the power selection unit based on the determination, and transmitting a phase control command to the rectification unit based on the determination A system for controlling the current of the field winding of the generator is provided.

Figure P1020150050300

Description

Field of the Invention [0001] The present invention relates to a system and a method for controlling a current of a field winding,

The present invention relates to a system and method for controlling a field current of a superconducting generator, and more particularly, to a system and method for controlling a field current of a field winding by controlling the magnitude of a voltage in accordance with a starting state of the generator, And methods.

Generally, superconducting generators are superconducting generators that use superconducting phenomena in which electric current term disappears at an absolute temperature of 0 [K], that is, -273 ° C.

In the early superconducting generators, wire materials which generate superconducting phenomena in an absolute temperature range of 4 to 20 [K] are used. Recently, a superconducting material is found at a relatively high absolute temperature of 30 to 77 [K] Development of generators is accelerating.

Most of the superconducting generators currently developed have a structure in which the superconducting windings replace the copper windings used in the field generators in the superconducting generators.

Thus, when a field is formed by a superconducting winding, a magnetic field of high magnetic field can be produced without loss due to electrical resistance. For this reason, superconducting generators have the disadvantage that they are more efficient, smaller in size and smaller in weight compared to conventional superconducting generators.

1 is a view showing a configuration of a general superconducting power generator.

A typical superconducting generator generally includes a rectifying system 20 for receiving an AC current from an exciting system 10 and an exciting system 10 and converting the DC current into a DC current and a superconducting field And a winding (40). Specifically, a three-phase alternating current is applied to the rectifying system 20 from a plurality of armature windings of the exciter system 10, and the rectifying system 20 supplies the DC converted current to the superconducting field winding 40 , The regulator system 30 stabilizes the supply of this direct current to the superconducting field winding 40. The current and voltage flowing through the superconducting field winding 40 are detected by the field sensor 50 and the control system 60 is controlled by the field current sensor 50 to generate a constant current The rectifying system 20 is controlled.

However, the conventional superconducting generator uses only a method in which only a current having a fixed magnitude of voltage is input to the superconducting field winding 40, so that there is a need for a method capable of controlling the voltage magnitude of the current . Alternatively, there is a method of using an armature to control the voltage of the current input to the superconducting field winding 40. However, according to this method, since the winding of the armature becomes thick and the overall size of the generator becomes large .

Also, in the case of the superconducting field winding 40, since the time constant is very large due to low resistance and high inductance, it is pointed out that it is difficult to control the current in real time according to the load condition of the generator.

In addition, since the exciter system 10 continuously supplies the current to the rectification system 20, it is also pointed out that a trouble occurs in the operation of the entire generator in the event of operation of the exciter system 10 or more.

U.S. Patent Application US2004-0155538 A1

SUMMARY OF THE INVENTION It is an object of the present invention to provide an efficient method for controlling a voltage magnitude of a current input to a superconducting field winding. It is another object of the present invention to provide a system in which a superconducting generator controls a current in real time according to a load situation. It is another object of the present invention to provide a system for continuously operating a generator in spite of operational abnormalities of an exciter system.

According to the present invention, there is provided a system for controlling a current of a field winding of a generator, comprising: a power selection unit connected to an output of an exciter and an output of the generator; A rectifier for converting an AC current input from the power source selection unit into a DC current through phase control; A field sensor for detecting a current and a voltage state of the field winding; And a controller for determining the state of the generator based on the detection result of the field sensor, transmitting a power selection command to the power selection unit based on the determination, and transmitting a phase control command to the rectification unit based on the determination A system for controlling the current of the field winding of the generator is provided.

The state of the generator includes at least one of an initial start, a stable start, and a high load start.

And the rectifying section is constituted by a phase control rectifying bridge circuit including a first SCR, a second SCR, a third SCR and a fourth SCR.

The control unit transmits a command to select the output of the exciter to the power source selecting unit and transmits a phase control command for the DC current of the first magnitude to the rectifying unit when the state of the power generator is determined to be an initial start .

Wherein the control unit transmits a command to select the output of the generator to the power selection unit when the state of the generator is determined to be a high load start, and transmits a command to the rectifying unit to perform a phase control for a DC current of a second size smaller than the first size And transmits the command.

Wherein the control unit transmits a command to select the output of the generator to the power selection unit when the state of the generator is determined to be a stable start and outputs a command to the rectifier to control the phase of the DC current for the third- And transmits the command.

According to another aspect of the present invention, there is provided a method for controlling the current of a field winding of a generator, comprising: receiving a current and voltage state of a field winding detected by a field sensor; Determining a state of the generator based on the detection result; Transmitting a power selection command to the power selection unit based on the determination; And transmitting a phase control command to the rectification section based on the determination. A method for controlling current in a field winding of a generator is provided.

The state of the generator includes at least one of an initial start, a stable start, and a high load start.

And the rectifying section is constituted by a phase control rectifying bridge circuit including a first SCR, a second SCR, a third SCR and a fourth SCR.

When the state of the generator is determined to be an initial start: transmitting an instruction to the power selection unit to select an output of the exciter; And transmitting a phase control command for a DC current of a first magnitude to the rectifying unit.

When the state of the generator is determined to be a high load start: transmitting an instruction to the power selector to select an output of the generator; And transmitting a phase control command for the DC current of the second size smaller than the first size to the rectifying unit.

Transmitting a command to the power selection unit to select an output of the generator when the state of the generator is determined as a stable start; And transmitting a phase control command for the DC current of the third magnitude smaller than the second magnitude to the rectifying unit.

According to the present invention, the magnitude of the current input to the superconducting field winding can be controlled.

According to the present invention, the current can be controlled in real time according to the load condition of the superconducting generator.

Also, according to the present invention, the operation of the generator can be stably continued even when an operation abnormality occurs in the exciter system.

1 is a view showing a configuration of a general superconducting power generator.
2A is a diagram illustrating a system for controlling current in a field winding of a superconducting generator according to an embodiment of the present invention.
2B is a view showing a rectifying part according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating a method of controlling current in a field winding of a superconducting generator according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The configuration of the present invention and the operation and effect thereof will be clearly understood through the following detailed description. Before describing the present invention in detail, the same components are denoted by the same reference symbols as possible even if they are displayed on different drawings. In the case where it is determined that the gist of the present invention may be blurred to a known configuration, do.

2A is a diagram illustrating a system for controlling current in a field winding of a superconducting generator according to an embodiment of the present invention.

2A, a power selection unit 110, a rectification unit 120, a regulator unit 130, a superconducting field winding 140, a field sensor 150, and a control unit 160 are illustrated.

The power source selection unit 110 is connected to the output of the exciter and the output of the generator. The main generator 200 is a generator in which the superconducting field winding 140 is wound and a part of the output of the main generator 200 is connected to the power source selection unit 110. The power source selection unit 110 selects either the output of the exciter or the output of the generator as an input power source in response to a command from the controller 160. [ For example, the power selection unit 110 can receive a command from the control unit 160 to select the output of the exciter at the initial startup before the generator is driven. After the generator is driven, The control unit 160 may receive a command to select the output of the generator to use a part of the power as the regenerative power. As a result, according to the present invention, unlike the conventional method in which AC input power must be continuously input from the excitation system, by receiving a part of the power of the generator as a regenerative power source, even when an abnormality occurs in the excitation system, It is possible to maintain the operation of the generator stably without interruption.

The rectifying unit 120 receives the three-phase alternating current from the power selecting unit 110 and converts it into a direct current. The rectifying unit 120 according to the present invention can control the magnitude of the direct current output through the phase control.

For example, the rectification unit 120 according to the present invention may be configured as a phase control rectifier bridge circuit including a first SCR, a second SCR, a third SCR, and a fourth SCR, as shown in FIG. 2B. Silicon controlled rectifier (SCR) can control the turn on time arbitrarily by gate driving and control the average voltage of DC converted through control of turn on point.

Specifically, the case where the SCR is turned on by delaying the input AC voltage by wt = 0 to? Will be described. ? is the delay angle, and Vs is the magnitude of the input AC voltage.

(i) 0? wt <?, the first SCR and the fourth SCR are forward biased but the gate pulse is not applied, and the second SCR and the third SCR are off biases because they are reverse biased.

(ii) If α ≤ wt <π, the first SCR and the fourth SCR turn on because the gate pulse is applied at phase angle wt = α. Therefore, the output voltage Vo is

Figure pat00001
to be.

(iii) In the case of π ≤ wt <π + α, the first SCR and the fourth SCR are reversed biased at wt = π and turn off. The second SCR and the third SCR are forward biased, State.

(iv) In the case of π + α ≤ wt <2π, the gate pulse is applied to the second SCR and the third SCR at the phase angle wt = π + α, Reverse bias and turns off. Therefore, the output voltage Vo is

Figure pat00002
to be.

As a result, the DC average output voltage,

Figure pat00003
Can be calculated as follows.

As a result, the delay angle? Can be controlled within the range of 0 to 180 degrees, so that the DC average output voltage is 0 to

Figure pat00004
Lt; / RTI &gt;

The rectifying unit 120 receives a phase control command for the magnitude of the DC current to be outputted from the controller 160. For example, the rectifier section 120 can receive a phase control command for a DC current of a large voltage from the control section 160 at the initial start of the generator in which a large voltage current flows, A phase control command for a DC voltage of a small voltage can be received from the controller 160. In a high load starting state in which a current of a larger voltage than a voltage at the initial start is required, From the control unit 160, a phase control command for the DC current. The large voltage, medium voltage, and small voltage referred to herein may vary depending on the capacity of the superconducting generator and the characteristics of the superconducting wire to be used. However, based on the 3.5 MW superconducting generator, for example, , The intermediate voltage is more than 5V and less than 100V, and the small voltage is less than 5V.

The regulator unit 130 is for stabilizing the direct current output from the rectifier unit 120 and may be configured as a pair of MOSFET switching devices or a DC-DC down converter.

The field sensor 150 senses the superconducting field winding 140 and detects the current or voltage of the current superconducting field winding 140. This is a process for detecting the operation state of the superconducting main generator 200.

The control unit 160 determines the state of the generator 200 based on the detection result of the field sensor. For example, if the current value at the field winding 140 is zero, it can be determined to be the initial start before the generator operates. Or if the current value at the field winding 140 is equal to the reference value at the predetermined steady state, the operation state of the generator 200 can be determined as stable start. Or when the current value at the field winding 140 is larger than the reference value at the predetermined stable state, the operation state of the generator 200 can be determined as the high load start.

If it is determined to be the initial start-up, the control unit 160 may transmit a command to the power source selection unit 110 to select the output of the exciter. This is because the generator output can not be selected because there is no power generated from the generator at the initial start-up. In addition, the controller 160 may transmit a control command for the DC current of the first magnitude to the rectifier 120. The DC current of the first magnitude means a DC current of a voltage higher than the voltage of the high load starting voltage and the voltage of the stable state, in order to accelerate the rotational speed of the generator to the maximum at the initial start.

The controller 160 may transmit a command to the power selection unit 110 to select the output of the generator. This is because the regenerative power of the generator 200 can be supplied continuously when the generator 200 is in a stable state after the initial startup. In addition, the controller 160 may transmit a control command for the DC current of the third magnitude to the rectifier 120. The DC current of the third size means a DC current of a voltage smaller than the voltage of the initial startup and the voltage of the high load starting described later, and the generator 200 can be driven with a relatively small voltage at the time of stable start.

If it is determined that the load is high, the control unit 160 may transmit a command to the power selection unit 110 to select the output of the generator. This is because the regenerative power of the generator 200 can be continuously supplied because the generator 200 is in a running state even at the time of a high load start. In addition, the controller 160 may transmit a control command for the DC current of the second size to the rectifier 120. The DC current of the second size means a DC current of a voltage that is smaller than the voltage of the initial start but a voltage larger than the voltage of the stable start and that a relatively larger voltage is required to be supplied to the generator 200 to be.

FIG. 3 is a diagram illustrating a method of controlling current in a field winding of a superconducting generator according to an embodiment of the present invention. The present method can be performed by the control unit 160. [

The current and voltage state of the field winding detected by the field sensor are received (S310), and the state of the generator is determined based on the detection result (S320). The conditions of the generator include initial start, stable start, and high load start.

The initial start-up is, for example, when the current value at the field winding is zero. The regenerative power of the generator can not be used as a starting power source since the power generated from the generator is not present since the current is applied to the field winding, and the output of the exciter should be used as the starting power. Also, in order to start the starting, a DC current of a large voltage must flow to the field winding.

The stable start is, for example, a case where the current value in the field winding is equal to the reference value in the predetermined stable state. The regenerative power of the generator can be used as the starting power because the generator is generating power. Also, in order to maintain power generation, a DC current of lower voltage will be required at startup.

The high load start is, for example, a case where the current value in the field winding is larger than the reference value in the steady state. The regenerative power of the generator can be used as the starting power because the generator is generating power. Also, in order to recover the power generation to a stable state, a DC current of a larger voltage than that of a stable start will be required.

Based on the determined state of the generator, a command to select either the output of the exciter or the output of the generator is transmitted to the power selection unit (S330). Further, a phase control command for controlling the magnitude of the direct current based on the determined state of the generator is transmitted to the rectifying unit (S340). The rectification section may be comprised of a phase controlled rectifier bridge circuit comprising a first SCR, a second SCR, a third SCR and a fourth SCR.

The foregoing description is merely illustrative of the present invention, and various modifications may be made by those skilled in the art without departing from the spirit of the present invention. Therefore, the embodiments disclosed in the specification of the present invention do not limit the present invention. The scope of the present invention should be construed according to the following claims, and all the techniques within the scope of equivalents should be construed as being included in the scope of the present invention.

110: Power selection unit 120:
130: regulator part 140: superconducting field winding
150: field sensor 160:

Claims (12)

A system for controlling current in a field winding of a generator,
A power selection unit connected to the output of the exciter and the output of the generator;
A rectifier for converting an AC current input from the power source selection unit into a DC current through phase control;
A field sensor for detecting a current and a voltage state of the field winding; And
A control unit for determining the state of the generator based on the detection result of the field sensor, transmitting a power selection command to the power selection unit based on the determination, and transmitting a phase control command to the rectification unit based on the determination doing,
A system for controlling the current of a field winding of a generator. The method according to claim 1,
Characterized in that the state of the generator includes at least one of an initial start, a stable start, and a high load start.
A system for controlling the current of a field winding of a generator. 3. The method of claim 2,
Characterized in that the rectifying part is comprised of a phase controlled rectifier bridge circuit comprising a first SCR, a second SCR, a third SCR and a fourth SCR.
A system for controlling the current of a field winding of a generator. The method of claim 3,
The control unit transmits a command to select the output of the exciter to the power source selecting unit and transmits a phase control command for the DC current of the first magnitude to the rectifying unit when the state of the power generator is determined to be an initial start Features,
A system for controlling the current of a field winding of a generator. 5. The method of claim 4,
Wherein the control unit transmits a command to select the output of the generator to the power selection unit when the state of the generator is determined to be a high load start, and transmits a command to the rectifying unit to perform a phase control for a DC current of a second size smaller than the first size Command, and &lt; RTI ID = 0.0 &gt;
A system for controlling the current of a field winding of a generator. 6. The method of claim 5,
Wherein the control unit transmits a command to select the output of the generator to the power selection unit when the state of the generator is determined to be a stable start and outputs a command to the rectifier to control the phase of the DC current for the third- Command, and &lt; RTI ID = 0.0 &gt;
A system for controlling the current of a field winding of a generator. A method for controlling current in a field winding of a generator,
Receiving a current and voltage state of a field winding detected by a field sensor;
Determining a state of the generator based on the detection result;
Transmitting a power selection command to the power selection unit based on the determination; And
And transmitting a phase control command to the rectification section based on the determination.
A method for controlling current in a field winding of a generator. 8. The method of claim 7,
Characterized in that the state of the generator includes at least one of an initial start, a stable start, and a high load start.
A method for controlling current in a field winding of a generator. 9. The method of claim 8,
Characterized in that the rectifying part is comprised of a phase controlled rectifier bridge circuit comprising a first SCR, a second SCR, a third SCR and a fourth SCR.
A method for controlling current in a field winding of a generator. 10. The method of claim 9,
If the state of the generator is determined as an initial start-up:
Transmitting an instruction to select the output of the exciter to the power selection unit; And
And transmitting a phase control command for a DC current of a first magnitude to the rectifying unit.
A method for controlling current in a field winding of a generator. 11. The method of claim 10,
If the state of the generator is determined to be a high load start:
Transmitting an instruction to the power selection unit to select an output of the generator; And
And transmitting a phase control command for a DC current of a second magnitude smaller than the first magnitude to the rectifying unit.
A method for controlling current in a field winding of a generator. 12. The method of claim 11,
If the state of the generator is determined as stable start-up:
Transmitting an instruction to the power selection unit to select an output of the generator; And
And transmitting a phase control command for a DC current of a third size smaller than the second size to the rectifying unit.
A method for controlling current in a field winding of a generator.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190047923A (en) 2017-10-30 2019-05-09 주식회사 만도 Device for controlling current for field wounding motor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040155538A1 (en) 2000-08-04 2004-08-12 American Superconductor Corporation, A Delaware Corporation Exciter for superconducting rotating machinery

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Publication number Priority date Publication date Assignee Title
KR101344121B1 (en) * 2012-09-28 2013-12-20 두산엔진주식회사 Apparatus and method for controlling field current of super conducting elecreic power generator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040155538A1 (en) 2000-08-04 2004-08-12 American Superconductor Corporation, A Delaware Corporation Exciter for superconducting rotating machinery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190047923A (en) 2017-10-30 2019-05-09 주식회사 만도 Device for controlling current for field wounding motor

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