KR100975072B1

KR100975072B1 - Brushless synchronous generator

Info

Publication number: KR100975072B1
Application number: KR1020100044368A
Authority: KR
Inventors: 서정기; 전성즙
Original assignee: 주식회사 대흥기전
Priority date: 2010-05-12
Filing date: 2010-05-12
Publication date: 2010-08-11

Abstract

PURPOSE: A brushless self-excited synchronous generator is provided to flexibly control a field current of a main generator by installing an axial power conversion device in a rotary shaft. CONSTITUTION: An axial power conversion device(60) is arranged between the rotator of an exciter(20) and the rotator of a main generator(10). The axial power conversion device changes the output of the rotor of the exciter to a bidirectional voltage and current. An AVR(Automatic Voltage controller)(40) is arranged between the output terminal of the main generator and the stator of the exciter. A permanent pole and an auxiliary pole are arranged in the stator of the exciter. A power coil and a signal coil are arranged in the rotor of the exciter.

Description

Brushless synchronous generator

The present invention relates to a brushless self-excited synchronous generator, and more particularly, to improve the rectifying circuit between the exciter and the main generator field of the brushless synchronous generator of the magnetically excited or PMG type. Invented to maintain the terminal voltage at the rated voltage.

In general, the synchronous generator refers to a generator in which the relative speed of the rotor and the stator rotates in synchronization with the rotating magnetic field among the alternators. The brushless synchronous generator, which is widely used as an emergency generator, has a very simple and robust structure. have.

The control system of a conventional brushless self-excited synchronous generator is shown in Figure 1, the main generator (1) having a main stator (Main stator) and the main rotor (Main rotor) is a rotation field type synchronizer, the exciter The exciter (2) with an exciter and exciter rotor is a rotating armature type synchronizer. The output of the exciter is supplied to the field of the main generator through a diode rectifier circuit (3) installed on the rotating shaft. do.

The stator of the exciter is provided with a field winding. Here, the exciter output voltage is controlled by receiving a signal from an AVR (Automatic Voltage Controller), and finally the main generator output voltage is controlled.

Structurally, a power generation system without a brush or commutator side is constructed, and the energy source applied to the excitation field through the AVR is self-excited from the output of the main generator, and from the other device, the excitation type.

It is called PMG type to install small auxiliary synchronous generator on the same axis among other excitation type and to use the output of this auxiliary synchronous generator as energy source of AVR. A disadvantage of the brushless synchronous power generation system is described with reference to FIG. 2.

2 is a circuit from the output of the exciter to the main generator field, in which both the output voltage and the current supplied by the diode rectifier circuit 3 installed at the exciter output terminal 2a to the field generator 1a are unidirectional. Subsequently, if the load is removed urgently, the response is slow and there is a problem in that it cannot cope with the advance (capacity) load.

That is, the brushless self-excited synchronous generator should change the field current direction of the main generator (1) when the load is positive, but in the conventional main generator field to supply energy by simply rectifying the output of the exciter with a diode, the direction of the field current If the fast load is connected to the emergency generator, there is a problem that the terminal voltage rises.

The present invention has been made to solve such a conventional problem, the main generator is installed on the axis of rotation of the brushless self-excited synchronous generator to control the output of the exciter in both directions, voltage and current By controlling the field current so as to be positive (+) or (-), the rated voltage can be maintained for the forward load and have a good response characteristic for the rapidly changing load. The exciter does not necessarily have a form in which the output of the excitation is changed according to the AVR, a permanent magnet synchronous generator can be used, and an auxiliary stimulus can be used to transmit a current control signal. RF (RF) signal can be used, and the auxiliary stimulus serves to transmit only the control signal when the auxiliary stimulus is used. Its purpose is to provide a brushless self-excited synchronous generator that can perform this.

The above object of the present invention is basically, a main generator having a main stator and a main rotor, an exciter having an exciter stator and a rotor, and a prime mover connected to the same shaft, and an output terminal of the main generator. In a brushless self-excited synchronous generator having an AVR installed between stators of an exciter, the rotor output of the exciter is generated between the rotor of the exciter and the rotor of the main generator. This can be achieved by installing an on-axis power converter that generates the power.

As described above, according to the brushless self-excited synchronous generator of the present invention, by installing an on-axis power converter that can control the output of the exciter to the bidirectional voltage and current on the rotating shaft, the main generator field current can be freely (+) or By controlling to be negative, it is possible to maintain the rated voltage with respect to the forward load, to have a good response characteristic against the rapidly changing load, and to allow the current control to be made by the axial power converter. The exciter does not have to have a form in which its output necessarily varies with the AVR, as well as a permanent magnet synchronous generator, and uses an auxiliary stimulus or RF to transmit current control signals. Signal, or in the case of using an auxiliary stimulus, the auxiliary stimulus transmits only a control signal. It is a very useful invention, such as being able to play a role.

1 is a block diagram of a control system of a conventional brushless self-excited synchronous generator.
2 is a circuit diagram from the output of the exciter to the main generator field.
3 is a block diagram of a control system of a brushless self-excited synchronous generator to which the present invention is applied.
Figure 4 is an excitation configuration of the brushless self-excited synchronous generator to which the present invention is applied.
5 is a detailed circuit diagram according to an embodiment of an axial power converter used in the present invention.
6 (a) and 6 (b) are waveform diagrams of output voltages of a feeder DC M-DC converter of FIG. 5.
Fig. 7 is a block diagram of another embodiment (when RF is used) of an axial power converter used in the present invention.
Figure 8 is a detailed circuit diagram according to another embodiment of the axial power converter used in the present invention.
9 (a)-(c) are waveform diagrams of organic electromotive force generated in the power windings when the power windings of the exciter are connected in series;
10 (a)-(c) are waveform diagrams of organic electromotive force induced in the signal windings when the signal windings of the exciter are connected in series;

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

3 is a block diagram of a control system of a brushless self-excited synchronous generator to which the present invention is applied, FIG. 4 is a block diagram of an exciter of a brushless self-excited synchronous generator to which the present invention is applied, and FIG. A detailed circuit diagram according to an embodiment of an on-axis power converter used in the present invention is shown, Figure 6 (a) (b) is an output voltage for the feed DC m DC-DC converter of Figure 5 The waveform diagram is shown.

7 shows a block diagram of another embodiment of the axial power converter used in the present invention (when RF is used), and FIG. 8 shows another embodiment of the axial power converter used in the present invention. 9 (a)-(c) show the organic electromotive force generated in the power windings (assuming that the rotor rotates clockwise) when the power windings of the exciter are connected in series. 10 (a)-(c) show the organic electromotive force (assuming that the rotor rotates clockwise) when the signal windings of the exciter are connected in series. The waveform diagram is shown.

According to the present invention, the main generator 10 having the main stator and the rotor, the exciter 20 having the exciter stator and the rotor, and the prime mover 50 are connected to the same shaft. In the brushless self-excited synchronous generator having a configuration in which an AV (40) is provided between the output terminal of (10) and the stator of the exciter 20,

An axial power converter 60 is installed between the rotor of the exciter 20 and the rotor of the main generator 10 to generate the rotor output of the exciter 20 with bidirectional voltage and current. It is done.

At this time, the stator of the exciter 20 is provided with a permanent stimulus 21 made of a permanent magnet and an auxiliary stimulus 22 wound around the winding, and the rotor of the exciter 20 is provided with a permanent stimulus 21. It is characterized in that it is provided with a power winding (23) using the voltage generated by the voltage and the signal winding (24) using the voltage generated by the auxiliary magnetic pole (22).

In addition, when the power windings 23 of the exciter 20 are connected in series, the voltages generated by the permanent magnetic poles 21 are all added together, and the voltages generated by the two auxiliary magnetic poles 22 are polarized with each other. When the signal windings 24 of the exciter 20 are connected in series, the voltages generated by the auxiliary magnetic poles 22 are added together, and the voltages generated by the permanent magnetic poles 21 are mutually eliminated. Voltages of opposite polarities are generated and erased.

In addition, the electricity generated by the power winding 23 is rectified to be used as a power source of the on-axis power converter 60, the electricity generated by the signal winding 24 to the voltage generated by the power winding 23 In accordance with the synchronous rectification is characterized in that it is used as a control signal of the axial power converter (60).

On the other hand, an embodiment of the on-axis power converter 60 is a feed-flow M DC composed of a rectifier 61 for rectifying the voltage generated in the exciter 20, a smoothing capacitor 62, a semiconductor switch element- It is rectified by the diode rectifier circuit 64 and the diode rectifier circuit 64 for rectifying the voltage generated by the auxiliary stimulus 22 of the exciter 20. It is characterized in that the configuration is configured as a feedblem (PWM) controller (65) to adjust the output current of the feeder DC M-DC (PWM dc-dc) converter (63).

In addition, another embodiment of the on-axis power converter 60 is a feeder flow M DC composed of a rectifier 61 for rectifying the voltage generated in the exciter 20, a smoothing capacitor 62, a semiconductor switch element In the PWM dc-dc converter 63, the RF transmitter 66 which transmits the voltage generated by the auxiliary stimulus 22 of the exciter 20, in the RF transmitter 66 According to the voltage inputted through the RF receiver 67 and the RF receiver 67, which receives the transmitted voltage and transmits the received voltage to the PWM controller 65. It is characterized by consisting of a feeder m (PWM) controller 65 for adjusting the output current of the DC (PWM dc-dc) converter (63).

In addition, another embodiment of the on-axis power converter 60 is a rectifier 61 for rectifying the voltage generated by the winding of the exciter 20 in the above embodiment, the smoothing capacitor 62 and the semiconductor Instead of the PWM dc-dc converter 63 composed of switch elements, the power converter 68 composed of SCRs is replaced, and the PWM controller 65 replaces the PSR. (SCR) It is characterized in that it is replaced by the call control device 69, through which it is possible to generate a firing pulse applied to the SCR (SCR) to a desired voltage.

Referring to the effects of the present invention configured as described above are as follows.

First, as shown in Figure 3, the brushless self-excited synchronous generator to which the present invention is applied, the main generator 10, the exciter 20, the prime mover 50 is connected to the same shaft, the main generator ( 10) is a rotating field type in which the rotor is a field.

In addition, the prime mover 50 is operated at a constant speed, the power generation voltage of the main generator 10 is determined by the field current, and the field current of the main generator 10 is the rotor of the exciter 20. It is controlled by the on-axis power converter 60 for controlling the voltage and current output from the bidirectional.

At this time, the exciter 20 has a configuration as shown in FIG.

4 exemplarily shows an eight-pole configuration, and in the case of other poles, the same principle can be used.

Here, the stator of the exciter 20 is provided with a permanent magnetic pole 21 made of a permanent magnet and an auxiliary magnetic pole 22 wound with a winding.

In addition, the rotor of the exciter 20 is provided with two windings, one of which is a power winding 23 using a voltage generated by the permanent magnetic pole 21, and the other winding is an auxiliary winding. The signal winding 24 uses the voltage generated by the magnetic pole 22.

At this time, when the power windings 23 of the exciter 20 are connected in series in the direction shown in FIG. 4, the voltage generated by the permanent magnetic pole 21 is as shown in FIGS. 9A to 9C. All of them are added, and the voltages generated by the two auxiliary magnetic poles 22 are canceled because their polarities are opposite to each other.

In addition, when the signal windings 24 of the exciter 20 are connected in series in the direction shown in Fig. 4, the voltage generated by the auxiliary magnetic pole 22 is as shown in Figs. 10A to 10C. All of them are added, and the voltages generated by the permanent magnets 21 are erased due to voltages having opposite polarities.

Here, the electricity generated by the power windings 23 is rectified and used as a power source of the on-axis power converter 60, and the electricity generated by the signal windings 24 matches the voltage generated by the power windings 23. It is synchronously rectified and used as a control signal of the on-axis power converter 60.

Therefore, the axial power converter 60 can freely control the field current of the main generator 10 by (+) or (-), so that not only the rated voltage can be maintained with respect to the forward load, but also suddenly changed. It is possible to have a good response characteristics to the load.

On the other hand, Figure 5 is an example of the axial power converter 60 connected between the exciter 20 and the field of the main generator 10 (61) rectifies the voltage generated by the winding of the exciter 20 The rectifier is a rectifying unit, and 62 is a smoothing capacitor.

In such a configuration, when the prime mover 50 rotates, a constant voltage is always formed on the smoothing capacitor 62 regardless of the control signal.

In addition, (63) is a pulse width modulation DC-DC (PWM dc-dc) converter composed of semiconductor switch elements, and the feeder DC M-DC (PWM dc-) having such a configuration is shown. dc) The converter 63 may operate as shown in FIG. 6A to generate a positive voltage, or operate as shown in FIG. 6B to generate a negative voltage.

Where V01 is the voltage at point A with respect to the midpoint of the voltage VDC across the smoothing capacitor 62, V02 is the voltage at point B, and Vf is the voltage at both ends of the main generator 10. Is applied to (10a).

The output of the PWM DC-DC converter 63 is applied to the field circuit 10a of the main generator 10 to control the generator terminal voltage.

In FIG. 5, the voltage generated by the auxiliary stimulus 22 of the exciter 20 is rectified by the diode rectifying circuit 61 to be provided to the PWM controller 65. The PWM controller 65 adjusts the output current of the PWM dc-dc converter 63 according to this voltage.

In the above, the PWM controller 65 controls the output current so that the generator terminal voltage becomes a predetermined value when the control signal is zero. AVR) is controlled to a predetermined value in the non-operating state.

On the other hand, Figure 7 is instead of the diode rectifier circuit 64 to rectify the voltage generated by the auxiliary magnetic pole 22 of the exciter 20 shown in Figure 5 to provide to the PWM controller 65 Another embodiment for transmitting a control signal for controlling the power converter 60 to RF (Radio Frequency) is shown, (66) is installed on the stator side as an RF (RF) transmitter, (67) The RF (RF) receiver is installed in the on-axis power converter 60.

When the RF signal is used as described above, the auxiliary magnetic pole 22 and the signal winding 24 are not provided in the exciter 20 of FIG. 4, and the axial power converter 60 shown in FIG. ), It is not necessary to install the diode rectifier circuit 64.

FIG. 8 illustrates another embodiment of the axial power converter 60. The rectifier 61 rectifies the voltage generated by the winding of the exciter 20 in FIG. 5, and the smoothing capacitor 62. And a power converter 68 composed of SCRs instead of a feeder DC DC-dc converter 63 composed of semiconductor switch elements, and also a feeder controller 65. Is replaced with an SCR call control device 69, thereby generating a firing pulse applied to the SCR (SCR) to a desired voltage.

It should be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

10: main generator 10a: field circuit
20: female 21: permanent stimulation
22: auxiliary stimulation 23: power winding
24: signal winding 40: AVR
50: prime mover 60: axial power converter
61 rectifier 62: smoothing capacitor
63: feedwound DC to DC (PWM dc-dc) converter
64: diode rectifier circuit 65: PWM controller
66 RF transmitter 67 RF receiver
68: power converter 69: SCR call control device

Claims

The main generator having the main stator and the main rotor, the exciter having the exciter stator and the rotor, and the prime mover are connected to the same shaft, and between the output terminal of the main generator and the stator of the exciter (AVR) In the brushless self-excited synchronous generator having the configuration of
Between the rotor of the exciter and the rotor of the main generator is installed an axial power converter for generating a rotor output of the exciter with a bidirectional voltage and current,
The stator of the exciter is provided with a permanent magnetic pole made of permanent magnets and an auxiliary magnetic pole wound with a winding. The rotor of the exciter uses a power winding using a voltage generated by the permanent magnetic pole and a voltage generated by the auxiliary magnetic pole. Equipped with signal winding,
The power windings of the exciter are connected in series so that the voltages generated by the permanent stimulus are added together, and the voltages generated by the two auxiliary stimulus are reversed in polarity to each other, and the signal windings of the exciter are A brushless self-excited synchronous generator characterized in that the voltage generated by the auxiliary stimulation is added to each other in series, and the voltages generated by the permanent stimulus cause voltages having opposite polarities to each other.

delete

The method according to claim 1,
The electricity generated by the power winding is rectified to be used as a power source of the axial power converter, and the electricity generated by the signal winding is synchronously rectified according to the voltage generated in the power winding to control the signal of the axial power converter. Brushless self-excited synchronous generator, characterized in that used as.

The method according to claim 4,
The on-axis power converter,
Rectifier for rectifying the voltage generated by the exciter, a feeder DC capacitor consisting of a smoothing capacitor and a semiconductor switch element, a diode rectifier for rectifying the voltage generated by the auxiliary stimulation of the exciter Brushless ruler characterized in that it is composed of a PWM controller to adjust the output current of the PWM DC-DC converter according to the voltage rectified by the diode rectifier circuit Woman generator.

The method according to claim 4,
The on-axis power converter,
RF rectifier for transmitting voltage generated by the rectifier for rectifying the voltage generated in the exciter, a feeder capacitor DC-dc converter composed of a smoothing capacitor and a semiconductor switch element, and an auxiliary stimulus of the exciter RF) transmitter, RF receiver which receives the voltage transmitted from RF transmitter and transmits it to PWM controller and feeder based on voltage inputted through RF receiver Brushless self-excited synchronous generator, characterized in that configured as a PWM controller to control the output current of the DC-DC (PWM dc-dc) converter.

The method according to claim 4,
The on-axis power converter,
A brushless self-excited synchronous generator comprising a power converter composed of SCR and an SCR firing control device for generating a firing pulse applied to the SCR with a desired voltage.