KR101362840B1 - Ac excited synchronous generator capable of compensating variation in rated voltage according to load - Google Patents

Abstract

Disclosed is an AC excited synchronous generator capable of compensating changes in rated voltage according to a load. According to one embodiment of the present invention, provided is the AC excited synchronous generator comprising a main generator, an exciter, and a bidirectional power converter. The main generator comprises a main generator stator in which an armature winding generating three phase AC power is wound and a main generator rotor in which a field winding generating a magnetic field by receiving DC is wound. The exciter comprises an exciter rotor and an exciter stator. The exciter rotor in which the armature winding outputting field current required for the main generator is wound is positioned on an axis which is the same as the main generator rotor. The exciter stator forms a multipole magnetic field. The bidirectional power converter is positioned on the axis which is the same as the main generator rotor and supplies AC generated in the armature winding to the field winding of the main generator by converting the AC into the DC according to an external control signal. [Reference numerals] (340) PWM controller

Description

AC Excited Synchronous Generator Capable of Compensating Variation in Rated Voltage According to Load}

This embodiment relates to an synchronous generator of an AC exciter type that compensates for a change in rated voltage according to a load. More specifically, the AC exciter type synchronous generator that compensates the variation of the rated voltage according to the load by adopting a bidirectional power converter capable of converting the output of the exciter supplying the field current to the main generator field circuit into bidirectional current. It is about.

The contents described in this section merely provide background information on the present embodiment and do not constitute the prior art.

1 is a schematic configuration diagram of a synchronous generator of a conventional AC exciter type.

As shown in FIG. 1, the AC excitation method rectifies the alternating current generated in the armature of the exciter 120 through a rectifier rotating along the shaft to direct current to excite the field winding 112 of the main generator 111. In FIG. 1, since the alternating current is rectified in the rectifier 130 embedded in the rotating part 150 as the rotating part 150 having a body, the part is indicated as a rotary rectifying method. This excitation method has the advantage of easy maintenance and maintenance because there is no slip ring and brush. Meanwhile, as shown in FIG. 1, the energy source applied to the field winding 122 of the exciter 120 is supplied from the output of the main generator 110 through an automatic voltage regulator (AVR) 140. It is called a self-exciting generator, and the other method is supplied from another device.

The automatic voltage regulator 140 automatically adjusts the excitation current of the exciter 120 to maintain a constant terminal voltage of the main generator 110 when there is a change in the output of the generator 100 according to the load change of the power system. Although not shown in FIG. 1, the main generator 110 includes a detector for detecting a deviation between the terminal voltage and a target value, an amplifier for amplifying the deviation, and a braking circuit for stabilizing the control system.

In the synchronous generator 100 of the AC exciter type illustrated in FIG. 1, when the output current supplied from the rectifier 130 to the field winding 111 of the main generator 110 is unidirectional, the load 160 is urgently removed. The response is late. In addition, the field current direction of the main generator 110 should be changed when the load 160 is the forward load, but the rectifier 120 is rectified and supplied to the field winding 111 of the main generator 110 by a diode. Therefore, the direction of the field current cannot be changed, resulting in a problem that the terminal voltage rises.

This embodiment adopts an AC exciter type synchronous generator which compensates the variation of rated voltage according to the load by adopting a bidirectional power converter capable of converting the output of the exciter supplying the field current to the main generator field circuit into bidirectional current. The main purpose is to provide.

According to an aspect of the present embodiment, the main generator having a main generator stator winding the armature winding for generating three-phase AC power and a main generator rotor wound the field winding for forming a magnetic field by applying a DC current, the main An armature winding for outputting the field current required for a generator is wound, and an exciter having an exciter rotor located on the same axis as the main generator rotor and an exciter stator for forming a multipolar magnetic field and the same axis as the main generator rotor. AC excitation including a bi-directional power converter positioned at the position and converting the AC generated in the armature winding of the exciter to a DC current in the (+) or (-) direction in accordance with an external control signal to supply to the field winding of the main generator To provide a synchronous generator of the conventional method.

The bidirectional power converter includes an inverter for rectifying three-phase alternating current generated in the armature winding of the exciter into a direct current, a smoothing circuit for smoothing the pulsated portion of the rectified direct current, and a smoothed direct current as a input in a positive or negative direction. PWM control of the switching element of the DC-DC converter according to the DC-DC converter and the external control signal to generate a DC current to supply to the field winding of the main generator, to control the output current direction of the DC-DC converter It may include a PWM controller.

In addition, the bidirectional power converter may include a braking circuit that is energized when the voltage at the input terminal of the DC-DC converter reaches a predetermined limit, and discharges energy recovered from the field winding of the main generator.

In addition, the inverter is composed of a three-phase full-wave rectifier circuit including six diodes connected to each other in a three-phase full-bridge method, the DC-DC converter is connected to each other in a full-bridge method It is composed of two switching elements, the braking circuit may be composed of a resistance element and a switching element connected in series with each other.

In addition, the switching device of the DC-DC converter may be a combination of a semiconductor device of any one of the BJT, MOSFET or IGBT and a free wheeling diode in parallel.

In addition, the PWM controller of the bi-directional power converter PWM for turning on / off the switching element of the DC-DC converter in accordance with the control signal receiving means for receiving the external control signal from an external control signal transmission means and the received external control signal. It may include a control circuit unit for generating a signal.

In addition, the PWM controller of the bi-directional power converter may further include a status information transmitting means for transmitting the status information of the synchronous generator to the outside.

In addition, the control signal receiving means may be implemented by any one means of an RF receiver or an optical receiver, and the state information transmitting means may be implemented by any one of an RF transmitter or an optical transmitter.

In addition, the control signal receiving means may be implemented as an optical receiver located on the rotation axis of the main generator rotor, the state information transmitting means is provided with a plurality of transmitters radially spaced apart from the optical receiver by a predetermined distance. It can be implemented with an optical transmitter.

In addition, the bidirectional power converter is configured to control the firing of the two-phase three-phase full-wave rectifier circuit and the silicon-controlled rectifier element including six silicon controlled rectifier (SCR) connected to each other in a three-phase full-bridge method It includes a firing controller for generating a firing pulse, wherein the two pairs of three-phase full-wave rectifier circuit may be connected in parallel to the opposite phase between the armature winding of the exciter and the field winding of the main generator.

In addition, the magnetic pole of the excitation stator may be formed of a permanent magnet or a field winding that is applied with a current from an automatic voltage regulator (AVR).

According to another aspect of the present embodiment, the excitation of the main generator having a main generator stator winding the armature winding generating three-phase AC power and a main generator rotor wound the field winding forming a magnetic field by applying a DC current In the excitation system of the AC excitation method, an armature winding for outputting the field current required for the main generator is wound, the excitation rotor and an exciter stator for forming a multi-pole magnetic field located on the same axis as the main generator rotor. Located on the same axis as the exciter and the main generator rotor, the alternating current generated in the armature winding of the exciter is converted into a DC current of the (+) or (-) direction according to an external control signal to the main generator Provides a bidirectional power converter for supplying field windings.

As described above, according to the present embodiment, by installing a bidirectional power converter that can control the output of the exciter to the bidirectional voltage and current on the rotating shaft to adjust the direction and intensity of the field current of the main generator, Even if the current flowing in the winding is not controlled by the automatic voltage regulator AVR, the terminal voltage of the generator can be controlled to a predetermined value.

In addition, by supplying current in both directions to the field winding 212 of the main generator 210, not only can the rated voltage be maintained for the forward load, but also can have a good response characteristic for the rapidly changing load. .

In addition, since the output of the exciter does not necessarily have to change in accordance with the automatic voltage regulator, there is an advantage that the exciter can be implemented as a permanent magnet synchronous generator that is not controlled by the automatic voltage regulator.

1 is a schematic configuration diagram of a synchronous generator of a conventional AC exciter type.
2 is a schematic configuration diagram of a synchronous generator of the AC excitation method according to an embodiment of the present invention.
3A is a diagram illustrating a circuit diagram of a bidirectional power converter according to an embodiment of the present invention.
3B is a diagram illustrating a circuit in which a braking circuit is added to the bidirectional power converter of FIG. 3A.
4A is an exemplary diagram of a switching operation of a DC-DC converter that outputs a positive current.
4B is an exemplary diagram of a switching operation of a DC-DC converter that outputs a negative current.
FIG 5 is a view schematically showing the waveform of the node A voltage V _A, the voltage V _f applied to the both ends of the field winding 212 of the node B voltage V _B and the main generator 210 according to the switching operation of the DC-DC converter Drawing.
FIG. 6 is a diagram schematically illustrating a configuration of the PWM controller shown in FIG. 3.
FIG. 7 is a view illustrating a schematic configuration of a transmitter and a receiver of each optical receiver when the control signal transmitter and the control signal receiver of FIG. 6 are implemented as an optical transmitter.
8 is a circuit diagram of a bidirectional power converter implemented with a silicon controlled rectifier.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. Throughout the specification, when an element is referred to as being "comprising" or "comprising", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise . When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

2 is a schematic configuration diagram of a synchronous generator of the AC excitation method according to an embodiment of the present invention.

According to an embodiment of the present invention, the AC exciter type synchronous generator 200 may include a main generator stator with a winding of an armature winding 211 generating three-phase AC power and a field winding which receives a DC current to form a magnetic field ( A main generator 210 having a main generator rotor wound around 212, an armature winding 221 for outputting the field current required for the main generator 210, and an exciter rotor located on the same axis as the main generator rotor. And an exciter 220 having an exciter stator for forming a multi-pole magnetic field and coaxially located with the main generator rotor. It includes a bi-directional power converter 230 to convert the DC current of the power supply to the field winding 212 of the main generator 210. 2 illustrates an exciter 220 in which the field current flowing through the field winding 222 is controlled by the automatic voltage regulator 240. Unlike FIG. 2, the exciter 220 may be a permanent magnet synchronous generator in which a stator is implemented as a permanent magnet.

In the present embodiment, the AC exciter type synchronous generator 200 controls the field current applied to the field winding 212 of the main generator 210 to be positive or negative by employing the bidirectional power converter 230. As a result, the voltage induced in the armature winding 211 of the main generator 210 is controlled. That is, since the bidirectional power converter 230 can freely control the field current of the main generator 210 to be positive (+) or negative (-), the synchronous generator 200 of the AC exciter type according to the present embodiment is advanced. Not only can the rated voltage be maintained with respect to the load, but also it can have a good response characteristic against a rapidly changing load.

Here, the main generator rotor, the winding of the field winding 212, the two-way power converter 230 and the excitation rotor, the winding of the armature winding 221 is connected to the same axis to rotate at a constant speed by a prime mover (not shown) do. That is, the main generator 210 is a rotating field type synchronous generator in which the field winding 212 is wound around the main generator rotor, and the exciter 220 is a rotating armature synchronization in which the armature winding 221 is wound around the excitation rotor. It is a generator. In FIG. 2, the field winding 212, the bidirectional power converter 230, and the armature winding 221 of the exciter 220 of the main generator 210 positioned on the rotation axis and rotated by the prime mover are illustrated as the rotating unit 250. It was.

3A is a diagram illustrating a circuit diagram of a bidirectional power converter according to an embodiment of the present invention.

As shown in FIG. 3A, the bidirectional power converter 230 connected between the armature winding 221 of the exciter 220 and the field winding 212 of the main generator 210 is an armature winding of the exciter 220. Inverter 310 for rectifying three-phase alternating current generated in 221 to a direct current, a smoothing circuit 320 for smoothing the pulsation of the rectified direct current, and a smoothed direct current as input to generate a positive or negative DC current. PWM-controlling the switching elements S1 to S4 of the DC-DC converter 330 according to the DC-DC converter 330 and the external control signal generated and supplied to the field winding 212 of the main generator 210. And a PWM controller 340 for controlling the output current direction of the DC converter 330. The detailed configuration of the PWM controller 340 will be described separately with reference to FIGS. 6 and 7.

The inverter 310 may be configured as a three-phase full-wave rectifier circuit including six diodes D1 to D6 connected to each other in a three-phase full-bridge manner. More specifically, as shown in FIG. 3, diode pairs {D1, D2}, {D3, D4}, and {D5, D6} are connected in series, respectively, and the three-phase AC current I _a , I _b and I _c are applied, and the smoothing circuit 320 is connected to the cathode of the upper diodes D1, D3, and D5 and the anode of the lower diodes D2, D4, and D6.

The DC-DC converter 330 may be composed of four switching elements S1 to S4 connected to each other in a full-bridge manner. More specifically, as shown in FIG. 3, the common connection terminal A of the first switching element S1 and the second switching element S2 is connected to one end of the field winding 212 of the main generator 210. The common connection end B of the third switching element S3 and the fourth switching element S4 is connected to the other end of the field winding 212 of the main generator 210.

The switching elements S1 to S4 of the DC-DC converter 330 may have a form in which one of the semiconductor elements of the BJT, MOSFET, or IGBT is combined with a regenerative diode in parallel.

On the other hand, when the field current of the main generator 210 is abruptly reduced, the energy stored in the L _f component of the field winding of the main generator 210 is recovered to increase the DC link voltage V _DC . Since the capacitance of the smoothing circuit 320 cannot be infinitely increased in order to prevent damage due to the increase of the DC link voltage, it is preferable to insert a braking circuit for discharging energy recovered from the field winding of the main generator 210. .

3B is a diagram illustrating a circuit in which a braking circuit is added to the bidirectional power converter of FIG. 3A .

3B illustrates a bidirectional power converter further including a braking circuit 335 between the smoothing circuit 320 and the DC-DC converter 330. The braking circuit 335 may include a resistance element R _dis and a switching element S5 connected in series to switch the energization of R _dis . Although a separate controller may be provided to control the switching operation of the switching device S5, as illustrated in FIG. 3B, a PWM controller 340 for PWM controlling the switching devices S1 to S4 of the DC-DC converter 330 may be provided. It may be configured to parallel control of switching element S5 of braking circuit 335. The switching element S5 may have a form in which one of the semiconductor elements of the BJT, the MOSFET, or the IGBT and the regenerative diode are coupled in parallel.

In the bidirectional power converter 230 having the braking circuit 335 as described above, if the field current of the main generator 210 rapidly decreases and V _DC reaches a certain limit, the switching device S5 is turned on, and thus the resistance device is turned on. The energy recovered from the field winding of the main generator 210 through R _dis is consumed.

Meanwhile, unlike the example illustrated in FIG. 3B, the braking circuit 335 may be implemented as a resistor and a switching device connected in parallel to each other between the positive terminal of the smoothing circuit 320 and S1 of the DC-DC converter 330. have. In this case, the switching element is normally kept ON, but if the field current of the main generator 210 rapidly decreases and V _DC reaches a certain limit, the switching element S5 is turned off. Energy recovered from the field winding of 210 is consumed.

Hereinafter, a switching operation of the DC-DC converter 330 for outputting a positive or negative current will be described with reference to FIGS. 4A, 4B, and 5.

4A is an exemplary diagram of a switching operation of a DC-DC converter for outputting a positive current, and FIG. 4B is an illustration of a switching operation of a DC-DC converter for outputting a negative current.

The DC-DC converter 330 outputs a positive or negative voltage according to the ON / OFF operation of the four switching elements S1 to S4.

When the first switching element S1 and the fourth switching element S4 of the DC-DC converter 330 are turned on, the field winding 212 of the main generator 210 is (+) through the path shown in FIG. 4A. The current flows in the direction, and at this time, the voltage V _f across the field winding 212 of the main generator 210 has a positive value. The scaling of the output current is possible by adjusting the duty at the time of turning on each switching element.

In addition, when the second switching element S2 and the third switching element S3 of the DC-DC converter 330 are turned on, the field winding 212 of the main generator 210 is connected to the field winding 212 through the path shown in FIG. A current flows in the negative direction, and at this time, the voltage V _f across the field winding 212 of the main generator 210 has a negative value. The adjustment of the output voltage can be made by adjusting the duty when each switching element is turned on.

On the contrary, when the first switching element S1 and the third switching element S3 are turned on or when the second switching element S2 and the fourth switching element S4 are turned on, the field winding of the main generator 210 is turned on. No current flows through 212, and the voltage V _f across the field winding 212 of the main generator 210 also becomes zero.

By turning on / off the switching elements of the DC-DC converter 330 in this manner, it becomes possible to control the direction of the current applied to the field winding 212 of the main generator 210 in both directions.

5 is a diagram illustrating the waveform of node A voltage V _A, the voltage V _f applied to the field winding opposite ends of the voltage V _B and the main generator of the node B in accordance with the switching operation of the DC-DC converter.

Here, V _A denotes the voltage of the node A which is a contact point of the first switching element (S1) and the second switching element (S2), V _B is a contact of the third switching element (S3) and the fourth switching element (S4). The node B refers to the voltage of the node B, and V _f means the voltage applied to the field winding 212 of the main generator 210 as a voltage between the node A and the node B.

As shown in (a) of FIG. 5, the switching operation of the DC-DC converter 330 is [S1 ON, S2 OFF, S3 OFF, S4 ON] → [S1 ON, S2 OFF, S3 ON, S4 OFF]. → [S1 ON, S2 OFF, S3 OFF, S4 ON] → [S1 OFF, S2 ON, S3 OFF, S4 ON] When repeated, V _f has a pulse shape with a positive V _DC value.

In addition, as shown in (b) of FIG. 5, [S1 ON, S2 OFF, S3 ON, S4 OFF] → [S1 OFF, S2 ON, S3 ON, S4 OFF] → [S1 OFF, S2 ON, S3 OFF] , S4 ON] → [S1 OFF, S2 ON, S3 ON, S4 OFF] If the switching operation is repeated, V _f has a pulse shape with a negative (-) V _DC value.

(+) Current smoothed by the inductor component Lf of the field winding 212 when a pulse signal of positive (+) V _DC or (-) V _DC value is applied to the field winding 212 of the main generator 210 Or a negative current flows.

Meanwhile, the PWM controller 340 of FIG. 3 controls the switching operation of the switching elements S1 to S4 such that the DC-DC converter 330 outputs a positive or negative current or voltage according to an external control signal. The means for receiving the external control signal will be described with reference to FIGS. 6 and 7.

FIG. 6 is a diagram schematically illustrating a configuration of the PWM controller shown in FIG. 3.

As illustrated in FIG. 6, the PWM controller 340 may be configured to control signal receiving means 610 for receiving an external control signal from a control signal transmitting means 630 connected to an external control device (not shown) and to the received external control signal. Accordingly, the control circuit unit 620 controls the switching operation of the switching elements S1 to S4 of the DC-DC converter 330.

The control signal transmission means 630 and the control signal reception means 610 of the PWM controller 340 connected to an external control device (not shown) may be implemented by various means of signal transmission means, for example, RF transmitter and It may be implemented as an RF receiver or as an optical transmitter and an optical receiver.

In addition, the PWM controller 340 may further include a state information transmitting means 615 for transmitting the state information of the synchronous generator 200 to the state information receiving means 635 connected to an external control device (not shown). The state information may be a field current of the main generator 212, a DC link voltage V _DC , a voltage V _f across the field winding 212 of the main generator 210, an operation state of the PWM controller 340, and the like.

The state information receiving means 635 and the state information transmitting means 615 of the PWM controller 340 connected to an external control device (not shown) may be implemented by various means of signal transmitting means, for example, RF transmitter and It may be implemented as an RF receiver or as an optical transmitter and an optical receiver.

In addition, the PWM controller 340 receives the measured field current from the measuring means (not shown) for measuring the field current of the main generator 212 to adjust the duty of the switching element of the DC-DC converter 330. This may be implemented to adjust the magnitude of the output voltage of the DC-DC converter 330.

On the other hand, the control signal transmission means 630 and the state information receiving means 635 connected to the external control device (not shown) are fixed to the stator or housing of the synchronous generator 200 of the AC excitation method, whereas the PWM controller The control signal receiving means 610 and the state information transmitting means 615 of 340 rotate together with the rotating shaft. Therefore, unlike the case where the transmitting / receiving means 610, 615, 630, and 635 are implemented as an RF transceiver, an optical transceiver is required to construct an optical transmitter that can guarantee transmission and reception of an optical signal. Do. To this end, in the present embodiment, the optical transceiver is configured in the form as shown in FIG. 7.

FIG. 7 is a diagram illustrating a schematic configuration of each optical transceiver when the transmission / reception means of the control signal and the transmission / reception means of the status information of FIG. 6 are implemented as optical transmitters, respectively.

In order to avoid confusion, the optical signal receiver implemented as the control signal receiving means 610 and the status information transmitting means 615 of the PWM controller 340 is called a "first optical transmitter" and connected to an external control device (not shown). The optical transmitter implemented as the control signal transmission means 630 and the status information receiving means 635 is called a "second optical transmitter".

As mentioned above, it is noted that the first optical transceiver is located on the rotation axis of the main generator rotor to rotate together with the main generator rotor. The first optical transmitter includes a receiver located on a rotation axis and a plurality of transmitters radially spaced apart from the predetermined distance. 9A illustrates a first optical transmitter 710 having one receiver 711 and six transmitters 712a to 712f. Here, the Y axis is the same as the rotation axis of the main generator rotor.

The second optical transmitter is fixed to the stator or the housing of the synchronous generator 200. The second optical transceiver includes a transmitter positioned on an extension line of the rotation axis of the main generator rotor and at least one receiver disposed radially spaced apart from the predetermined distance by the transmitter. 7B illustrates a second optical transmitter 730 having one transmitter 731 and one receiver 732.

Since the receiver 711 of the first optical receiver 710 and the transmitter 731 of the second optical receiver 730 are on the same axis, even if the receiver 711 of the first optical receiver 710 rotates, the second optical receiver The optical signal (external control signal) transmitted from the transmitter 731 of 730 can always be received.

On the other hand, the six circles 713a to 713f illustrated in FIG. 7B are light transmitted from the six transmitters 712a to 712f of the first optical transmitter 710 illustrated in FIG. 7A, respectively. The reception range of the signal is shown. As shown in FIG. 6, the transmitters 712a to 712f are arranged such that the six reception ranges overlap each other, so that the receiver of the second optical receiver 730 may rotate even if the transmitters 712a to 712f of the first optical receiver 710 rotate. 732 is positioned in at least one receiving range 713a to 713f.

Meanwhile, the bidirectional power converter 230 of FIG. 2 may be implemented as a silicon controlled rectifier (SCR), which will be described with reference to FIG. 8.

8 is a circuit diagram of a bidirectional power converter implemented with a silicon controlled rectifier.

As shown in FIG. 8, the bidirectional power converter includes a three-phase full-wave rectifier circuit 2 including six silicon controlled rectifiers {SCR1 to SCR6} and {SCR7 to SCR12} connected to each other in a three-phase full-bridge method. The controller 830 may generate a firing pulse for controlling the firing of the pairs 811 and 812 and the silicon controlled rectifiers SCR1 to SCR12.

Two pairs of three-phase full-wave rectifier circuits 811 and 812 are input to the armature winding 221 of the exciter 220, but are coupled in opposite directions. Therefore, when the silicon control rectifier elements SCR1 to SCR6 of the first full-wave rectifier circuit 811 are turned on and the silicon control rectifier elements SCR7 to SCR12 of the second full-wave rectifier circuit 812 are turned off, the main generator ( An electric current flows in the field winding 212 of 210 in the (+) direction (clockwise). If the silicon controlled rectifier elements SCR1 to SCR6 of the first full-wave rectifier circuit 811 are turned off and the silicon controlled rectifier elements SCR7 to SCR12 of the second full-wave rectifier circuit are turned on, the main generator 210 of the main generator 210 is turned on. In the field winding 212, a current flows in the negative (counterclockwise) direction. In this way, the first full-wave rectifier circuit 811 and the second full-wave rectifier circuit 812 are controlled by the two directions of the field current applied to the field winding 212 of the main generator 210.

The foregoing description is merely illustrative of the technical idea of the present embodiment, and various modifications and changes may be made to those skilled in the art without departing from the essential characteristics of the embodiments. Therefore, the present embodiments are to be construed as illustrative rather than restrictive, and the scope of the technical idea of the present embodiment is not limited by these embodiments. The scope of protection of the present embodiment should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

200: synchronous generator 210: main generator
211: Armature winding (of main generator) 212: Field winding (of main generator)
220: Exodus 221: (Excitation) Armature winding
222: field winding 230: bidirectional power converter
240: automatic voltage regulator 250: rotating part
260: load 310: inverter
320: smoothing circuit 325: breaking circuit
330: DC-DC converter 340: PWM controller
610: control signal receiving means 615: status information transmitting means
620: control circuit unit 630: control signal transmission means
635: status information receiving means
711: receiver of the first optical transceiver
712a-712f: transmitting unit (of the first optical transceiver)
731: transmitting unit (of the second optical transceiver)
732: receiving unit (of the second optical transceiver)

Claims (15)

A main generator having a main generator stator wound with an armature winding generating three-phase AC power and a main generator rotor wound with a field winding forming a magnetic field by receiving a DC current;
An exciter having an armature winding for outputting a field current required for the main generator, an exciter rotor located on the same axis as the main generator rotor, and an exciter stator for forming a multipolar magnetic field; And
Located on the same axis as the main generator rotor, converts the alternating current generated in the armature winding of the exciter to a DC current in the (+) or (-) direction in accordance with an external control signal to supply to the field winding of the main generator Bidirectional Power Converter
AC exciter type synchronous generator comprising a. The method of claim 1,
The bidirectional power converter,
An inverter for rectifying three-phase alternating current generated in the armature winding of the exciter into direct current;
A smoothing circuit for smoothing the pulsating powder of rectified DC;
A DC-DC converter for generating a DC current in a positive (+) or (-) direction by supplying a smoothed direct current to the field winding of the main generator; And
PWM controller for controlling the output current direction of the DC-DC converter by PWM control the switching element of the DC-DC converter according to the external control signal
AC excitation system synchronous generator comprising a. 3. The method of claim 2,
The bidirectional power converter,
And a braking circuit that is energized when the voltage at the input terminal of the DC-DC converter reaches a predetermined limit, and discharges energy recovered from the field windings of the main generator. The method of claim 3,
The inverter consists of a three-phase full-wave rectification circuit including six diodes interconnected in a three-phase full-bridge scheme,
The DC-DC converter is composed of four switching elements connected to each other in a full-bridge manner,
The braking circuit is an AC exciter type synchronous generator, characterized in that consisting of a series of resistance elements and switching elements connected in series. 5. The method of claim 4,
The switching element of the DC-DC converter,
An alternating current excitation type synchronous generator characterized in that the semiconductor element of any one of the BJT, MOSFET or IGBT and the regenerative diode (Free Wheeling Diode) is coupled in parallel. 5. The method of claim 4,
PWM controller of the bidirectional power converter,
A control signal receiving means for receiving the external control signal from an external control signal transmission means and a control circuit portion for generating a PWM signal for turning on / off the switching element of the DC-DC converter according to the received external control signal. AC exciter type synchronous generator characterized in that. The method according to claim 6,
PWM controller of the bidirectional power converter,
AC excitation type synchronous generator, characterized in that it further comprises a status information transmitting means for transmitting the status information of the synchronous generator to the outside. The method of claim 7, wherein
The control signal receiving means is implemented by any one means of an RF receiver or an optical receiver, and the status information transmitting means is implemented by any one means of an RF transmitter or an optical transmitter. . The method of claim 7, wherein
The control signal receiving means is implemented with an optical receiver located on the rotation axis of the main generator rotor,
The state information transmitting means is an AC exciter type synchronous generator, characterized in that implemented as an optical transmitter having a plurality of transmitters radially spaced apart from the optical receiver by a predetermined distance. The method of claim 1,
The bidirectional power converter,
Two-phase full-wave rectification circuit including six silicon controlled rectifiers (SCR) connected to each other in a three-phase full-bridge method and a firing controller for generating a firing pulse for controlling the firing of the silicon-controlled rectifiers Including but not limited to:
The pair of three-phase full-wave rectifier circuit is the AC excitation type synchronous generator, characterized in that connected in parallel with the phase between the armature winding of the exciter and the field winding of the main generator in parallel. The method of claim 1,
The exciter of the exciter stator is an AC exciter type synchronous generator of the synchronous generator, characterized in that formed by the field winding applied current from the Automatic Voltage Regulator (AVR). AC excitation type excitation system for the excitation of the main generator with a main generator stator wound with an armature winding generating three-phase AC power and a main generator rotor wound with a field current applied to form a magnetic field To
An exciter having an armature winding for outputting a field current required for the main generator, an exciter rotor located on the same axis as the main generator rotor, and an exciter stator for forming a multipolar magnetic field; And
Located on the same axis as the main generator rotor, converts the alternating current generated in the armature winding of the exciter to a DC current in the (+) or (-) direction in accordance with an external control signal to supply to the field winding of the main generator Bidirectional Power Converter
Excitation excitation system of the synchronous generator comprising a. The method of claim 12,
The bidirectional power converter,
A three-phase full-wave rectifying circuit comprising six diodes connected to each other in a three-phase full-bridge method for rectifying the three-phase alternating current generated in the exciter to direct current;
A smoothing circuit for smoothing the pulsating powder of rectified DC;
A DC-DC converter composed of four switching elements connected to each other in a full-bridge manner to generate a DC current in a positive (+) or (−) direction by inputting a smoothed direct current to a field winding of the main generator; And
A controller for controlling the output current direction of the DC-DC converter by PWM controlling the switching element of the DC-DC converter according to the external control signal
The excitation system of the AC excitation method of the synchronous generator comprising a. 14. The method of claim 13,
The bidirectional power converter,
And a braking circuit having a resistance element and a switching element connected to each other, which are energized when the voltage at the input terminal of the DC-DC converter reaches a predetermined limit and discharges energy recovered from the field winding of the main generator. The excitation system of the alternating current excitation system. The method of claim 12,
The bidirectional power converter,
A pair of three-phase full-wave rectifying circuits including six silicon-controlled rectifiers connected to each other in a three-phase full-bridge method and a firing controller for generating a firing pulse for controlling the firing of the silicon-controlled rectifiers;
And two pairs of three-phase full-wave rectifier circuits are coupled in parallel with each other in parallel phase between the armature winding of the exciter and the field winding of the main generator.

Images