KR101021195B1 - Multi-function digital automatic voltage regulator for emergency revolving field type synchronous generator - Google Patents

Abstract

PURPOSE: A multifunctional digital automatic voltage regulator for an emergency rotary field type synchronous generator is provided to improve a control response speed with regard to an output voltage of a generator by using a PWM DC chopper. CONSTITUTION: A diode rectification unit(510) is comprised of a bridge circuit and converts AC power to DC power. A PWM DC chopper unit(520) control sub filed power supplied to a sub field input terminal by modulating the DC power output with a PWM duty control signal. A control power supply(540) generates control power for an operation by receiving the output of the generator. A digital control unit(570) controls the PWM duty control signal inputted to the PWM DC chopper unit. An initial excitation unit(530) supplies or blocks the power to or from the sub field input terminal.

Description

Multi-function Digital Automatic Voltage Regulator for Emergency Revolving Field Type Synchronous Generator}

The present invention relates to an automatic voltage regulator (AVR) of an emergency rotating field-type synchronous generator, and more particularly, to increase the control response speed of the generator output voltage, to accurately control the effective value, and to generate the generator output state and rotation. The present invention relates to a multi-function digital automatic voltage regulating device for an emergency rotating field-type synchronous generator capable of checking the state of the electron and protecting the generator from a malfunction of the generator.

1 is a schematic view of an emergency rotating field-type synchronous generator system according to the prior art.

As shown, the rotation field type synchronous generator system is composed of an engine unit 100 for providing power, a generator 200, an automatic voltage regulator (AVR) 300, and a control panel 400.

The engine unit 100 is composed of various mechanical devices such as the engine 110, the cooling system 120, the fuel system 130, and the engine controller 140. The generator 200 includes an auxiliary field 210, an auxiliary armature 220, a main field 230, and a main armature 240. The control panel 400 is composed of various electric devices such as the generator controller 410, the battery 420, the battery charger 430, and the circuit breaker 440.

2 is a diagram illustrating a detailed configuration of the generator 200 of FIG. 1 and a connection state of the generator 200 and the automatic voltage regulator (AVR) 300.

As shown, the rotating field-type synchronous generator 200 is divided into a stator composed of the auxiliary field 210 and the main armature 240, and a rotor composed of the auxiliary armature 220 and the main field 230. do. Here, the bridge diode 250 is connected between the auxiliary armature 220 and the main field 230, and converts the three-phase alternating current input from the auxiliary armature 220 into a direct current to the main field 230.

The illustrated rotation field-type synchronous generator 200 includes a rotating armature-type auxiliary generator composed of an auxiliary field 210 and an auxiliary armature 220, and a rotation system composed of a main field 230 and an auxiliary armature 240. It is divided into the main generator of the shape. As such, the rotation field type synchronous generator 200 has a form in which the auxiliary generator of the rotating armature type and the main generator of the rotating field type are combined, and the main field generator 230 of the main generator rotates.

At this time, an automatic voltage regulator (AVR) 300 is connected between the main armature 240 and the auxiliary field 210 to control the magnitude of the output voltage generated and output from the main armature 240. That is, the automatic voltage regulator (AVR) 300 operates by receiving power output from the main armature 240 and adjusts the power supplied to the auxiliary field 210 according to the input voltage setting command. Adjust the output voltage output from 240 to correspond to the output voltage setting command.

3 is a diagram illustrating a configuration of a conventional automatic voltage regulator (AVR) 300 shown in FIG. 2.

As shown, the automatic voltage regulator (AVR) 300 includes an analog controller 310 and a phase controlled rectifier 320.

The analog controller 310 receives the output voltage setting command and the control gain adjustment signal input by the operator of the generator, detects the output voltage of the generator output from the main armature 240, and then converts the phase angle control signal into a phase control rectifier. Output to 320. The phase control rectifier 320 controls the phase angles of the input AC power P1 and P2 according to the phase angle control signal input from the analog controller 310 and outputs them to the auxiliary field 210.

In this way, the automatic voltage regulator (AVR) 300 controls the power supplied to the auxiliary field 210, thereby controlling the output voltage of the generator.

Here, the control algorithm of the analog controller 310 is used as a PI (Proportional Integrate) control or PID (Proportional Integral Differential) control algorithm.

According to such a conventional technique, when detecting the generator output voltage output from the main armature 240 using an analog circuit, it is impossible to directly detect the effective value of the generator output voltage. Therefore, after rectifying the generator output voltage, the average value is derived by using a low pass filter, and thus the method of estimating the effective value of the output voltage is mainly used. At this time, if the output voltage of the generator is not a perfect sine wave but contains harmonics, there is a problem that an error occurs in the generator output voltage because the exact effective value cannot be estimated.

In addition, since the time delay of the low pass filter is expressed as the time delay of the output voltage detection, the control response is delayed by that amount.

On the other hand, since the single-phase phase-controlled rectifier 320 is mainly used as a power converter, when driven with a generator output voltage of 60 Hz, it has a very late control cycle of about 8.3 [msec]. Due to such a late control cycle, when the load suddenly changes, there is a problem that the responsiveness of the generator output voltage control is significantly reduced.

In addition, in the conventional analog voltage regulator (AVR) 300, since the output voltage and the control gain are set using a variable resistor, it is inconvenient to use and when the noise is input from the outside, the generator output voltage is There is a problem that fluctuates.

In addition, the conventional automatic voltage regulator (AVR) 300 did not have additional functions other than the function of controlling the output voltage of the generator.

An object of the present invention for solving the above problems is to increase the control response speed of the generator output voltage, enable accurate control of the effective value and to check the generator output state and the state of the rotor to prevent the generator from operating errors It is to provide a multifunctional digital automatic voltage regulating device of an emergency rotating field-type synchronous generator that can be protected.

Multifunctional digital automatic voltage regulating device of the emergency rotating field-type synchronous generator according to an embodiment of the present invention for achieving the above object, by rectifying the output of the generator generated by the residual magnetic flux at the beginning of the generator to the DC power The output of the DC output power supply (R +, R-) supplying power to the auxiliary field input terminal (J +, K-) through the current limiting resistor, and the output voltage of the generator gradually rises to An initial excitation unit which cuts off the power supplied to the auxiliary field input terminals J + and K- when the control power is output at a normal level; A PWM DC chopper unit for modulating the DC output power (R +, R-) by the PWM duty adjustment signal to adjust the auxiliary field power supplied to the auxiliary field input terminals (J +, K-); A control power unit configured to generate a control power required to operate an automatic voltage adjusting device by receiving the generator output as the generator is started and operated; And a digital controller configured to adjust the PWM duty adjustment signal input to the PWM DC chopper to correspond to the output voltage setting command of the output voltage of the generator.

Preferably, the digital control unit, the subtractor for obtaining an error between the output voltage setting command and the value corresponding to the three-phase average output voltage of the generator; A proportional differential integral controller which calculates a proportional differential integral; And an adder for generating a PWM duty adjustment signal by adding a three-phase average output power corresponding to the output of the proportional differential integral controller and the power output from the generator, and outputting the PWM duty adjustment signal to the PWM DC chopper unit.

Multifunction digital automatic voltage regulating device according to an embodiment of the present invention, the display unit for displaying the operation state of the generator further comprises, wherein the digital control unit output voltage, output current, active power, every half cycle of the generator output voltage, The effective power, power factor, frequency, etc. are calculated and displayed on the display unit.

Multifunction digital automatic voltage regulating device according to an embodiment of the present invention, the wireless communication unit for receiving status information for the rotor of the generator further comprises, the digital control unit and the voltage, current and power input to the host The rotor state information such as the temperature of the auxiliary armature winding, the temperature of the host field winding, etc. is displayed on the display unit, and the excitation power of the generator is completely cut off according to the rotor state information, so that the generator operation can be scheduled or the output voltage By changing the setpoint, it protects the rotor from overvoltage, overcurrent and over temperature.

Multifunction digital automatic voltage regulating device according to an embodiment of the present invention, a diode rectifier configured to convert the AC power (P1, P2) output from the generator into a DC to the initial excitation portion and the PWM DC chopper unit configured as a bridge circuit It further includes;

The multifunction digital automatic voltage regulating device according to an embodiment of the present invention further includes an interface circuit unit which detects a cross flow in parallel operation with the output voltage and the output current output from the generator and outputs it to the digital controller.

Multifunction digital automatic voltage adjusting device according to an embodiment of the present invention, the switch unit for outputting the output voltage setting command and the control gain adjustment signal to the digital control unit in accordance with a command input from the user using a plurality of switches; Include.

According to the multi-function digital automatic voltage regulator of the emergency rotating field-type synchronous generator of the present invention, by using a PWM DC chopper can increase the control response speed to the output voltage of the generator, it is possible to control the exact effective value through digital control, It is possible to control the parallel operation of the generator through cross-flow detection, to display the output status of the generator, and to check and operate the generator and the rotor by wirelessly receiving and displaying the status information of the auxiliary armature and the host of the rotor, By checking the operation status information of the generator and the rotor to control the operation of the generator in case of abnormality can protect the generator from the error of the generator.

1 is a schematic view of an emergency rotating field-type synchronous generator system according to the prior art.
2 is a diagram illustrating a detailed configuration of the generator 200 of FIG. 1 and a connection state of the generator 200 and the automatic voltage regulator (AVR) 300.
3 is a diagram illustrating a configuration of a conventional automatic voltage regulator (AVR) 300 shown in FIG. 2.
4 is a diagram illustrating a multifunctional digital automatic voltage regulating device of an emergency rotating field-type synchronous generator according to a preferred embodiment of the present invention.
5 is a diagram illustrating a detailed configuration of the PWM DC chopper unit 520 of FIG. 4 according to an exemplary embodiment of the present invention.
6 is a diagram illustrating a detailed configuration of the initial excitation unit 530 of FIG. 4 according to an embodiment of the present invention.
7 is a diagram illustrating in detail a configuration of a rotor state detector for monitoring a state of the rotor of FIG. 2 according to an embodiment of the present invention.
8 is a flowchart illustrating an output state calculation and control of a generator by the digital controller 570 of FIG. 4 according to an exemplary embodiment of the present invention.
FIG. 9 is a flowchart illustrating an operation control process for protecting the rotor of the digital controller 570 with respect to data transmitted from the rotor state detector of FIG. 7.
10 is a diagram illustrating a configuration example for processing a field control algorithm in step S170 of the digital control unit 570 of FIG. 4 according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the figures are represented by the same numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

4 is a diagram illustrating a multifunctional digital automatic voltage regulating device of an emergency rotating field-type synchronous generator according to a preferred embodiment of the present invention.

As illustrated, the multifunction digital automatic voltage regulator 500 may include a diode rectifier 510, a PWM DC chopper 520, an initial excitation unit 530, a control power supply 540, an interface circuit unit 550, and a switch unit ( 560, a digital controller 570, a display unit 580, and a wireless communication unit 590.

The diode rectifier 510 is configured as a bridge circuit to convert the AC power (P1, P2) output from the main armature 240 to a DC output.

The PWM DC chopper unit 520 modulates the output power (R +, R-), which is converted into DC from the diode rectifier 510 and output, by the PWM duty adjustment signal of the digital controller 570, thereby inputting the auxiliary field 210 input terminal ( Control the power supplied to J +, K-).

The initial excitation unit 530 is a magnetic flux of NS is generated as the DC output power (R +, R-) output from the diode rectifier 510 is applied to the excitation winding of the exciter provided, the generated magnetic flux is the core of the exciter Through the transmission to the auxiliary field 210 of the generator. After all, the exciter functions like a direct current electromagnet rotating inside the generator. After the exciter is operated by the electromagnet for a predetermined time, the magnet properties remain in the core of the exciter even after the operation of the generator is stopped. This is the magnetic flux remaining in the core and is called the residual magnetic flux. As long as the residual magnetic flux is not 0, a voltage of several V is induced in the generator output voltage even without an external automatic voltage regulator. That is, in the generator that has been started and operated at least once, residual magnetic flux is present for several months during the excitation phase of the initial excitation portion 530. This exciter is a general feature in the electromagnetic field. In the present invention, the exciter is used for initial start-up of a generator. In the exemplary embodiment of the present invention, the initial excitation unit 530 is connected to the auxiliary field 210 at the beginning of the generator 200 by using the residual magnetic flux of the exciter before the digital automatic voltage regulator (AVR) 500 operates. Supply power. To this end, the initial excitation unit 530 supplies the power of the DC output power (R +, R-) corresponding to the residual magnetic flux to the auxiliary field input terminals (J +, K-) through the current limiting resistor. In addition, when the output voltage of the generator gradually rises and is output at a normal level, the initial excitation unit 530 cuts off the power supplied to the auxiliary field input terminals J + and K− in response to the residual magnetic flux.

The control power supply unit 540 supplies the control power supply Vcc to the initial excitation unit 530, the interface circuit unit 550, the switch unit 560, the digital control unit 570, the display unit 580, and the wireless communication unit 590. do. To this end, the control power supply unit 540 receives an output voltage of several tens to several hundred volts (V) output from the main armature 240, and converts it into a DC control power and outputs it.

The interface circuit unit 550 may include an output voltage and an output current of the generator 200 output from the main armature 240 using an operational amplifier or the like so as to be suitable for A / D (Analog to Digital) conversion in the digital controller 570. The cross flow in parallel operation is detected and output to the digital control unit 570.

The switch unit 560 outputs an output voltage setting command and a control gain adjustment signal to the digital controller 570 according to a command input from a user using a plurality of switches.

The digital controller 570 A / D converts an output voltage of the generator 200 input from the interface circuit unit 550, and the A / D converted voltage corresponds to an output voltage setting command input from the switch unit 560. A PWM duty adjustment signal is generated through a digital signal processing algorithm to have a voltage level and output to the PWM DC chopper unit 520.

The display unit 580 displays a state of the generator 200 and an operation state of the rotor of the generator 200 under the control of the digital controller 570.

The wireless communication unit 590 performs wireless communication with a wireless communication unit built in the rotor of the generator 200 or a wireless communication unit built in the generator main controller or a wireless communication unit embedded in an automatic voltage regulator (AVR) of another generator during parallel operation. Then, the rotor and the generator main control unit of the generator 200 and the operation state information of the other generator is received and output to the digital control unit 570.

5 is a diagram illustrating a detailed configuration of the PWM DC chopper unit 520 of FIG. 4 according to an exemplary embodiment of the present invention.

As illustrated, the PWM DC chopper unit 520 includes an insulator 521, a drive power supply 522, a drive IC (integrated circuit) 523, and a FET.

The insulation unit 521 insulates the digital control unit 570 and the PWM DC chopper unit 520 using a photo coupler. The driving power supply unit 522 generates power for operating the driving IC 523 and supplies the driving power to the driving IC 523. The driving IC (integrated circuit) 523 is operated by using the driving power provided from the driving power supply unit 522 to amplify the PWM duty adjustment signal input from the digital control unit 570 and output it to the FET.

 In the FET, the PWM driving current provided from the driving IC 523 flows through the gate resistance Rg, thereby driving the FET. The power (J +, K-) supplied from the diode rectifier 510 and supplied to the auxiliary field 210 varies according to the PWM duty of the FET. When the FET is turned off, the electric charges charged in the parasitic capacitor component between the gate and the source of the FET are discharged through the discharge resistor Rd to achieve a fast turn off.

The PWM DC chopper unit 520 having such a configuration has a characteristic that the response speed to the control is very faster than that of the conventional phase control rectifier 320 (see FIG. 3).

6 is a diagram illustrating a detailed configuration of the initial excitation unit 530 of FIG. 4 according to an embodiment of the present invention.

As shown, the initial excitation unit 530 includes a photo coupler 532, a photo coupler primary side current limiting resistor Ri, an excitation current limiting resistor Re, a bias resistor Rb, a zener diode ZD, and a FET. It is configured to include.

The photocoupler primary side current limiting resistor Ri protects the porter coupler primary side from overcurrent by limiting the current supplied from the control power supply 540 to the porter coupler primary side.

The photo coupler 532 includes a light emitting diode and a photo transistor, and emits light according to a current input through the current limiting resistor Ri to operate the photo transistor.

Excitation current limiting resistor (Re) limits the current flowing to the generator start-up auxiliary field (210).

The bias resistor Rb has a function for obtaining a drive voltage of the FET from a current applied through the exciting current limiting resistor Re.

Zener diode ZD has a function to prevent the gate of the FET from being broken from overvoltage.

The FET 280 supplies power (J +, J-) to the auxiliary field 210 in an initially switched-on state when power (R +, R-) is generated from the diode rectifier 510, and a control power supply unit. When a constant voltage Vcc is generated from the 540 and the photo coupler 532 is operated, the switch is turned off to cut off the supply of the power J + and J-.

7 is a diagram illustrating in detail a configuration of a rotor state detector for monitoring a state of the rotor of FIG. 2 according to an embodiment of the present invention.

The rotor state detector includes a state detector 610, a digital signal processor 630, and a wireless communication unit 650.

The state detector 610 detects the temperature of the winding from the auxiliary armature 220 and the host field 230, and detects an input voltage and an input current from an input terminal of the host field 230.

The digital signal processor 630 digitally converts the detected auxiliary armature 220 and the windings of the host field 230 and the input voltage and the input current of the host field 230.

The wireless communication unit 650 measures the temperature of the digitally converted auxiliary armature 220 and the winding of the host arm 230, the input voltage and the input current of the host arm 230, and the wireless communication unit 590 of the digital automatic voltage regulator 500. To send).

8 is a flowchart illustrating an output state calculation and control of a generator by the digital controller 570 of FIG. 4 according to an exemplary embodiment of the present invention.

First, the digital control unit 570 increments a counter every half cycle of the output voltage input from the interface circuit unit 550 (S110). The digital controller 570 A / D converts the three-phase output voltage, the output current, and the cross flow input from the interface circuit unit 550 (S120). The digital controller 570 performs a low pass filter algorithm processing on the A / D converted three-phase output voltage, output current, and cross flow (S130).

The digital controller 570 calculates the sum of the three-phase instantaneous power and the instantaneous power from the low-pass filter-processed three-phase output voltage and output current (S140). The digital controller 570 performs a square operation of the instantaneous values for the three-phase output voltage, the output current, and the cross flow (S150). The digital controller 570 performs a sum of squares of instantaneous values of the three-phase output voltage, the output current, and the cross flow (S160). The digital controller 570 processes the field control algorithm (S170), and changes the DC chopper PWM duty (S180). This controls the output voltage of the generator.

The digital controller 570 determines whether the polarity of the input output voltage is changed (S190). If the polarity is not changed, the digital controller 570 repeatedly performs steps S100 to S180. If the polarity is changed, the digital controller 570 calculates the three-phase active power by averaging the instantaneous power (S210). The digital controller 570 calculates an average of squares for the three-phase output voltage, the output current, and the cross flow (S220). The digital controller 570 calculates an effective value of the three-phase output voltage, the output current, and the cross flow (S230). The digital controller 570 calculates an average of the effective values of the three-phase output voltages (S240). The digital controller 570 calculates a three-phase average active power (S250). The digital controller 570 calculates a three-phase average effective power (S260). The digital controller 570 calculates a three-phase average power factor (S270). The digital controller 570 calculates a frequency (S280).

The digital control unit 570 displays the output state of the generator including the output voltage of the generator, the output current through the cross-flow and the effective value of the output current, the effective power average value, the power factor, and the frequency on the display unit 580 ( S290). The digital controller 570 initializes the sum of the squares and the half-period counter value (S310). Thereafter, the digital controller 570 repeats steps S110 to S310.

FIG. 9 is a flowchart illustrating an operation control process for protecting the rotor of the digital controller 570 with respect to data transmitted from the rotor state detector of FIG. 7.

First, the digital controller 570 determines whether there is received data in the wireless communication unit 590 (S410), and if there is received data, analyzes the packet of the received data (S420). Accordingly, the digital controller 570 determines whether there is an error in the received data packet (S430). If there is no error, the digital control unit 570 determines whether the information is about parallel operation received from the main controller of the generator (S440).

If the received data packet is information on parallel operation, the digital controller 570 processes the parallel control algorithm (S460) and changes the set value of the output voltage (S460).

On the other hand, if it is determined in step S440 that the received data packet is not information on parallel operation, the digital controller 570 determines whether the received data packet is information on the rotor state (S450). Here, the state information of the rotor includes information about the winding temperature of the auxiliary armature 220, the input voltage of the host field 230, the input current and the winding temperature.

If the received data packet is information on the rotor state, the digital controller 570 displays the received rotor state information on the display unit 580 (S480). At this time, the digital controller 570 determines whether the state of the rotor is normal through the received rotor state information (S490). If the state of the rotor is normal, the digital controller 570 repeats steps S410 to S480 again.

If the state of the rotor is not normal, the digital control unit 570 processes the protection algorithm of the rotor (S510) and determines whether operation stop for the rotor is necessary (S520). If the driving stop is required, the digital controller 570 transmits the driving stop command of the rotor to the wireless communication unit 650 of the rotor through the wireless communication unit 590 (S530). If it is not necessary to stop the operation, the digital control unit 570 changes the set value of the output voltage (S540). The rotor of the generator is thus protected against overvoltage, overcurrent and overtemperature.

10 is a diagram illustrating a configuration example for processing a field control algorithm in step S170 of the digital control unit 570 of FIG. 4 according to an embodiment of the present invention.

First, the digital controller 570 subtracts an output voltage set value input from the switch unit 560 and a three-phase average output voltage input from the interface circuit unit 550 using a subtractor 571, and generates an error according to a difference value. A value is inputted to the proportional differential integrator 573, and the adder 575 is used to add and calculate the output of the proportional differential integrator and the three-phase average output power input from the interface circuit 550 to generate a PWM DC chopper 520. A PWM duty adjustment signal, which is a field power control signal, is generated.

In the above, specific preferred embodiments of the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiments, and any person having ordinary skill in the art to which the present invention pertains may make various modifications and equivalents without departing from the gist of the present invention attached to the claims. Other implementations may be possible. Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

100: engine 200: generator
210: auxiliary field 220: auxiliary armature
230: ruler 240: host
300: AVR 400 Control Panel
500: digital AVR 510: diode rectifier
520: PWM DC chopper part 530: initial excitation part
540: control power supply unit 550: interface circuit unit
560: switch unit 570: digital control unit
580: display unit 590: wireless communication unit

Claims (8)

In the multifunction digital automatic voltage regulating device of the emergency rotating field type synchronous generator,
Residual magnetic flux corresponding to the DC output power (R +, R-) supplied at the time of operation of the generator through the excitation winding and core of the exciter is provided, and then corresponding to the residual magnetic flux at the initial restart of the generator The power of the DC output power (R +, R-) is supplied to the auxiliary field input terminal (J +, K-) through a current limiting resistor, and when the output voltage of the generator gradually rises and is output at a normal level, the auxiliary field input terminal An initial excitation unit which cuts off power supplied to (J +, K−);
A PWM DC chopper unit for modulating the DC output power (R +, R-) by the PWM duty adjustment signal to adjust the auxiliary field power supplied to the auxiliary field input terminals (J +, K-);
A control power supply unit generating control power required to operate by receiving the output of the generator as the generator is started and operated; And
And a digital controller configured to adjust a PWM duty adjustment signal input to the PWM DC chopper to correspond to an output voltage setting command of the output voltage of the generator.
The method of claim 1,
The digital control unit,
A subtractor for calculating an error between the output voltage setting command and a value corresponding to a three-phase average output voltage of the generator;
A proportional differential integral controller for calculating proportional differential integrals of the errors; And
And an adder for generating the PWM duty adjustment signal by adding the output of the proportional differential controller and the three-phase average output power corresponding to the power output from the generator, and outputting the PWM duty adjustment signal to the PWM DC chopper unit. Digital automatic voltage regulator.
The method of claim 1,
A display unit for displaying the operation state of the generator further comprises;
And the digital control unit calculates and displays an active power, an effective power, a power factor, and a frequency for the voltage every half cycle of the voltage output by the generator.
The method of claim 3, wherein
And a wireless communication unit configured to receive state information about the rotor of the generator from the rotor.
The digital control unit displays the rotor state information on the display unit, and adjusts the PWM duty adjustment signal by changing a setting value for the operation control of the generator and an output voltage of the generator according to the rotor state information. Multifunction digital automatic voltage regulating device.
The method of claim 4, wherein
And the state information of the rotor comprises at least one of a winding temperature of the rotor's auxiliary armature, a winding temperature of the rotor's main field and an input voltage and an input current.
The method of claim 1,
Multi-function digital automatic voltage regulating device further comprises; a diode rectifier configured to convert the AC power (P1, P2) output from the generator into a DC and output to the initial excitation section and the PWM DC chopper section; .
The method of claim 1,
And an interface circuit unit which detects a cross flow in parallel operation with the output voltage and the output current output from the generator, and outputs the horizontal circuit to the digital control unit.
The method of claim 1,
And a switch unit configured to output the output voltage setting command and the control gain adjustment signal to the digital control unit according to a command input from a user using a plurality of switches.

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