JPH0449353B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to starting control of a generator motor in a pumped storage power plant, and particularly to a thyristor starting device for starting the generator motor.

Pumped storage power plants generate electricity during the day when demand for electricity is high, and use surplus electricity at night to pump water to the upper pond for daytime power generation. Therefore, in order to operate the generator motor as an electric motor and pump water,
A device is installed to start the generator motor. Recently, a method of directly starting a generator motor, which is a synchronous motor, using a thyristor starting method has become mainstream.

FIG. 1 shows an example of the configuration of a conventional thyristor starting device for a generator motor. A power source is connected to a forward converter 4 via a power supply side disconnector 1, a circuit breaker 2, and a starting transformer 3. This forward converter 4 is connected to an inverse converter 6 via a DC reactor 5. The output side of this inverter 6 is connected to a generator motor 10 via an AC reactor 7, a starting circuit breaker 8, and a starting disconnector 9. This generator motor 10 has a position detector 1 for detecting the position of the rotor.
1 is attached, and its detection signal is input to the thyristor control protection device 12. This thyristor control protection device 12 is configured as a pulse signal generating means for generating a pulse signal for controlling the thyristors of the forward converter 4 and the inverse converter 6 in accordance with a starting command. When generating the pulse signal, consideration is given to providing a commutation margin angle in the control advance angle of the gate pulse signal for the thyristor in order to prevent the thyristor from being destroyed due to commutation failure. . This makes it possible to control and protect the thyristor.

The secondary side of the starting transformer 3 is input to the thyristor control protection device 12 via the instrument current transformer 13, and the circuit breaker 2 side of the power supply side disconnector 1 is input via the instrument transformer 14. There is. An operation command device 15 is connected to this thyristor control protection device 12, and a synchronization joining device 16 is connected to this operation command device 15.
signal is being input. Furthermore, the output signal of this thyristor control protection device 12 is transmitted to the gate control device 1.
7, and the output signal of this gate control device 17 is output to the forward converter 4 and the inverse converter 6. Note that 18 is an excitation device for the generator motor 10 , and 19 is a main system device, which is connected to the generator motor 10 .

In such a thyristor starting device, the thyristor control protection device 12 controls the forward converter 4 to perform constant DC current control and the inverse converter 6 to perform constant control advance angle control, so that the generator motor 1
The generated torque at 0 is constant as shown in the following equation.

T≒K・Id ^cos 〓 …(1) However, T is torque, Id is DC current, β is control advance angle, and K is proportionality constant.

FIG. 2 shows an example of the configuration of the thyristor control protection device 12. The operation command device 15 is connected to a speed control circuit 20 of the thyristor control protection device 12, and the output of this speed control circuit 20 is output to a constant current control circuit 21 and an operation mode control circuit 22. The constant current control circuit 21 includes an instrument current transformer 13.
The output of the constant current control circuit 21 is inputted, and the output of the constant current control circuit 21 is outputted to the power supply side automatic pulse phase shift circuit 23. The output of the instrument transformer 14 is input to the power supply side automatic pulse phase shift circuit 23, and the output of the power supply side automatic pulse phase shift circuit 23 is output to the power supply side pulse amplification circuit 24, which is used for power supply side pulse amplification. The output of the circuit 24 is output to the gate control device 17.

The output of the operation mode control circuit 22 is output to a constant current control circuit 21 and a torque direction control circuit 25. The output of the instrument current transformer 13 is input to this torque direction control circuit 25, and the output of the torque direction control circuit 25 is output to a load-side automatic pulse phase shift circuit 26. The output of the load-side automatic pulse phase shift circuit 26 is output to the operation mode control circuit 22 and the load-side pulse amplification circuit 27. The output of this load-side pulse amplification circuit 27 is output to the gate control device 17.

The output signal of the position detector 11 is input to a synchronization signal switching circuit 28, and the output of this synchronization signal switching circuit 28 is output to a load-side automatic pulse phase shift circuit 26 and a speed detection circuit 29. This speed detection circuit 2
The output of 9 is output to the speed control circuit 20, the operation mode control circuit 22, and the frequency multiplication circuit 30. The output of this frequency multiplier circuit 30 is output to the load-side automatic pulse phase shift circuit 26.

Next, the operation of the thyristor control protection device 12 will be explained. The start command output from the operation command device 15 is sent to the speed control circuit (hereinafter referred to as ASR).
20 and the operation mode control circuit (hereinafter referred to as MCR)
22. ASR calculates a predetermined rotation speed command value and uses a constant current control circuit (hereinafter referred to as ACR)
Give the rotation speed command value to 21 and MCR.
The MCR calculates the operation mode from the start command, the rotation speed command, and the actual rotation speed of the generator motor 10 output from the speed detection circuit 29, and sends the calculation result to the ACR and the torque direction control circuit (hereinafter referred to as TCR) 25. is given as a control signal. ACR is ASR
and a control signal given from the TCR, and calculates so that the DC current is constant using the input current of the forward converter 4 as a feedback signal,
The calculation result is given to the power supply side automatic pulse phase shift circuit (hereinafter referred to as APPS1) 23. ASSS1 is
According to the signal given from the ACR, the optimum firing pulse for the thyristor is calculated and given to the power supply pulse amplification circuit (hereinafter referred to as APA1) 24.
The signal power amplified by the APA 1 is output to the gate control device 17, which controls the pulse applied to the gate of the thyristor to perform constant current operation.

On the other hand, the TCR calculates the control advance angle according to the command value given from the MCR, and sends a signal that keeps the control advance angle constant to the load side automatic pulse phase shift circuit (hereinafter referred to as
(referred to as APPS2) 26. This APPS2 is
The pulse generation phase is determined by the TCR output signal, the synchronous signal switching circuit 28, the distance detection circuit 29, and the frequency multiplier circuit 30, which are used to determine the rotation speed, rotor angle, and rotating magnetic field of the generator motor 10. control, load-side pulse amplification circuit (hereinafter referred to as APA)
(referred to as 2) to the gate control device 17 through 27, and operates the inverter 6 to inversely convert the DC power generated by the forward converter 4 into AC power to rotate the generator motor 10.

However, since the ACR performs control with a constant current and the TCR performs control with a constant control advance angle, the generator motor 10
The generated rotational torque is constant as shown in equation (1), and as the idling loss of the generator motor 10 increases, the startup time also increases in proportion to this. The startup time can be controlled by increasing the DC current, but the forward converter 4 excluding the generator motor 10,
Since it is limited by the rated current of the DC reactor 5, starting transformer 3, etc., the DC current cannot be increased. Even if the ratings of each device were increased to enable control using direct current, the device would be uneconomical and undesirable.

By the way, among the idling losses that occur when starting the generator motor 10, the runner loss of the water turbine can be cited as the largest one. In this runner loss, the bearing feng shui flow rate is approximately constant, and an increase or decrease in loss can be ignored. However, the amount of water leakage from the guide valve is expected to increase over time, and the runner loss will also increase accordingly. Therefore,
Since the conventional thyristor starting device performs constant torque control of the generator motor, the increase in the runner loss appears as an extension of the starting time of the generator motor. Therefore, it becomes impossible to keep the starting time of the generator motor constant. This means that even though surplus electricity is used late at night, the startup time of the generator motor, which is a huge load, is not known.
This is not a good thing in terms of power system operation. That is, the conventional thyristor starting device has a drawback that it is difficult to accurately grasp the load condition of the power system and perform efficient system operation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a thyristor starting device for a generator motor that can eliminate the above-mentioned drawbacks and control the starting time of the generator motor so that it is always constant.

In order to achieve the above object, the present invention provides a forward converter 4 which is configured with a thyristor and converts AC power into DC power, and a reverse converter 4 which is configured with a thyristor and converts the output power of the forward converter 4 into AC power. converter 6
, the electrical quantity detectors 13 and 14 that detect the electrical quantity on the input side of the forward converter 4, the position detector 11 that detects the rotational position of the generator motor 10, the start command, the electrical quantity detectors 13 and 14, and the position A pulse signal generation means 12 generates a forward converter control pulse signal and an inverse converter control pulse signal based on the output signal of the detector 11, and forward conversion is performed according to each pulse signal generated by the pulse signal generation means 12. 4 and a gate control means 17 for sequentially applying a gate pulse signal to the gate of each thyristor of the inverter 6.
The output side of the generator motor 10 is connected to the generator motor 10, and the pulse signal generating means 12 generates the generator motor 10 from the output signal of the position detector 11.
an actual rotation speed detection means 29 that detects the actual rotation speed of the rotation speed detection means 29; a rotation speed command generation means 20 that generates a rotation speed command from the startup command and the detection output of the actual rotation speed detection means 29; An operation mode determination means 22 that determines the operation mode based on the detection output of the rotation speed detection means 29, and a rotation speed command generation unit that generates a pulse signal for controlling the forward converter 4 to make the output current of the forward converter 4 a specified current. Forward converter control pulse signal generating means 21 and 23 are generated from the rotational speed command output from the means 20 and the detection outputs of the electric quantity detectors 13 and 14, and the gate pulse signal for controlling the thyristor of the inverse converter 6 is Control advance angle constant control signal output means 25 that outputs a control advance angle constant control signal for keeping the angle constant; and an inverse converter 6 that monitors the output of the position detector 11.
control signal output means 29, 46, 4 for outputting a control signal for adjusting the control advance angle for adjusting the control advance angle of the gate pulse signal for the thyristor according to a change in the idling loss of the generator motor 10;
7, 50, when the operation mode determination means 22 determines that the operation mode is in the initial startup period, selects the control advance constant control signal, and when it is determined that the operation mode is in the acceleration period, selects the control advance angle constant control signal. A control signal selection means 52 for selecting an adjustment control signal; and an inverse converter control pulse signal generation means 26 for generating an inverse converter control pulse signal in accordance with the control signal selected by the control signal selection means 52. This configuration is a thyristor starting device for a generator motor.

Hereinafter, before going into Examples, an outline of the present invention will be described.

FIG. 3A is a characteristic diagram showing changes in the DC current and changes in the rotational speed of the water turbine when the generator motor is started, and FIG. 3B is a characteristic diagram of the control advance angle. In FIG. 3A, the solid line shows the characteristics at the time of startup without delay, but the speed characteristic 31 and the DC current characteristic 32 shown by the broken lines show the characteristics at the time of delay in startup. Furthermore, the constant advance angle control by the torque direction control circuit of the thyristor control protection device is as shown in FIG. 3B. In other words, the control advance angle (hereinafter referred to as β)
is the sum of the minimum commutation margin angle (hereinafter referred to as γmin) 33 required for commutation of the thyristor, the weight angle (hereinafter referred to as U) 34, and the commutation margin angle margin 35. Generally, the commutation margin angle is 35
is about 25 times γmin, which is set to a relatively large value. Since U is proportional to the DC current, if the DC current is constant at the rated current value, U will also be constant and γmin will hardly change. In addition, numeral 42 indicates the initial stage of startup (intermittent commutation region), numeral 43 indicates the acceleration period (autocommutation region), and numeral 59
indicates the constant speed period, and the broken line indicates the characteristics during startup delay.

Therefore, it is possible to increase the rotational torque of the generator motor by decreasing β. To vary this β, use a control advance limiter (hereinafter referred to as β limiter) shown in the β limiter characteristic diagram shown in Figure 4.
36 is not constant, two β limiters may be provided, and the control advance angle may be freely changed within the deviation of these two β limiters. In addition, the reference numeral 37 in FIG. 4 indicates the β limiter characteristic when the current feedback is zero, and the reference numerals 38 and 39 indicate the β limiter characteristics during rotational braking. Further, reference numeral 40 indicates a control advance angle during pumping, and reference numeral 41 indicates a control advance angle during power generation. Further, reference numeral 42 indicates the initial stage of startup, reference numeral 43 indicates the acceleration period, reference numeral 44 indicates the rotational speed during pumping, and reference numeral 45 indicates the rotational speed during power generation.

In this way, by changing the control advance angle and increasing the rotational torque of the generator motor in response to the increase in runner loss, constant startup time control can be performed without extending the startup time. Note that the control advance angle can be varied by comparing the reference rotation speed and the actual rotation speed and making it proportional to the deviation thereof. That is, the third
The speed characteristic shown by the solid line in A in the figure shows the reference rotation speed characteristic of the generator motor to keep the startup time constant, and the reference rotation speed corresponding to this reference rotation speed and the actual rotation speed of the generator motor Find the deviation of
If control is performed to suppress this deviation to zero, constant startup time control becomes possible. By the way, the output is 240MW
Experimental results using a class generator motor show that the control advance angle β
If you reduce by 1 degree in electrical angle, you can shorten the startup time by about 15 seconds. If the commutation margin angle is about 1.5 times the minimum commutation margin angle γmin, there is no risk of commutation failure, so β
can be reduced by about 10 degrees, and as a result, the startup time can be shortened by about 2 minutes, and even if the amount of water leakage from the guide valve increases, the operating time can be kept constant.

Hereinafter, an embodiment of the present invention will be explained with reference to the drawings, using the same reference numerals for the same parts as in the conventional example.

FIG. 5 shows the configuration of a thyristor control and protection device which is a main part of an embodiment of the thyristor starting device for a generator motor of the present invention. In this example,
There is no change in the circuit configuration that controls the forward converter 4.
Constant current control is performed. The changed part is on the side that controls the inverse converter 6, and since this changed point will be explained below, please refer to FIG. 2 for parts similar to the conventional example.

As a new circuit for controlling the pulse given to the thyristor gate of the inverter 6,
Reference rotation speed generation circuit 46, rotation speed addition switching circuit 4
7. A second torque direction control circuit 50 and an input signal discrimination circuit 52 are provided. The reference rotation speed generation circuit 46 and the rotation speed addition switching circuit 47 are the speed detection circuit 2.
9, it is configured as a reference rotation speed signal output means for outputting a reference rotation speed signal corresponding to the target reference speed during the acceleration period of the generator motor 10.
The second torque direction control circuit 50 uses the reference rotation speed signal output from the rotation speed addition switching circuit 47 and the speed detection circuit 2.
It is configured as a control advance angle variable control signal generating means that receives the actual rotational speed signal of 9 outputs and generates a control advance adjustment control signal for suppressing the deviation between the two to zero. The input signal discrimination circuit 52 selects the first torque direction output signal (control advance constant control signal) 53 when the operation mode control circuit 22 determines that the operation mode is in the initial stage of startup, and selects the first torque direction output signal (control advance constant control signal) 53 when the operation mode is accelerated. It is configured as a control signal selection means that selects the output signal (control signal for control advance angle adjustment) of the second torque direction control circuit 50 when it is determined that the control signal is in the period. The output signals of the speed detection circuit 29 and the reference rotation speed generation circuit 46 are input to the rotation speed addition switching circuit 47. The rotational speed addition switching circuit 47 receives an actual rotational speed output signal 48 which is the output of the speed detection circuit 29, and also receives an operational mode signal 49 which is the output of the operational mode control circuit 22. The rotation speed that is the output of the rotation speed addition switching circuit 47 is output to the second torque direction control circuit 50, and the second torque direction control circuit 50 receives the operation mode signal 49 and the output of the instrument current transformer 13. A current feedback signal 51 and the actual rotational speed output signal 48 are input. The output of this second torque direction control circuit 50 is output to an input signal discrimination circuit 52.
The operation mode signal 49 and the first torque direction output signal 53 which is the output of the torque direction control circuit 25 are inputted to. This input signal discrimination circuit 5
A control advance angle output signal 54, which is the output of No. 2, is output to the load-side automatic pulse phase shift circuit 26. Other configurations are similar to the conventional example.

Next, the operation of this embodiment will be explained, but only the characteristic part, the control method on the inverter side, will be explained. The operation mode signal 49 calculated by the operation mode control circuit MCR22 is a constant current control circuit.
ACR21, torque direction control circuit (TCR1) 2
5, second torque direction control circuit (TCR2) 50,
Rotation speed addition switching circuit 47 and input signal discrimination circuit 5
2 respectively. That is, in the MCR, the determination of the initial start-up period (intermittent commutation region), acceleration period (natural commutation region), and uniform speed period is calculated based on the actual rotational speed output signal 48 from the speed detection circuit 29.
The TCR 1 calculates a control advance angle β ₁ suitable for the driving mode from the calculation output of the MCR, and provides this result to the input signal discrimination circuit 52 as a first torque direction output signal 53 . The reference rotation speed generating circuit 46 generates reference tick pulses whose pulse intervals can be varied. In accordance with the operation mode signal 49, the rotational speed addition switching circuit 47 counts the rotational speed from the actual rotational speed output signal 48 generated by the speed detection circuit 29 in the initial stage of startup, accumulates it in the counter, and sequentially sends the output signal to the TCR 2. Hand over. In addition, the operation mode signal 4
9 switches from the initial startup period to the acceleration period, the acquisition of the actual rotational speed output signal 48 is stopped, and at the same time,
The output signal of the reference rotation speed generation circuit 46 is taken in and the actual rotation speed output signal 48 is stored in the counter.
The output signal is added to and continues to be accumulated, and the output signal is sequentially delivered to the TCR2.

By doing this, the rotation signal input to TCR2 will be the actual rotation speed at the beginning of startup, and during the acceleration period, it will be the maximum actual rotation speed at the beginning of startup plus the reference rotation speed, and it will be proportional to the time based on the actual rotation speed at the beginning of startup. A reference rotational speed signal 55 is obtained. This signal 55 is generated corresponding to the target reference speed of the generator motor 10, as shown by the speed characteristic shown by the solid line in FIG.
The TCR 2 performs calculations using this input signal 55, the actual rotational speed output signal 48, and the operation mode signal 49. That is, when the operation mode signal 49 is in the acceleration period, the reference rotation speed and the actual rotation speed are successively compared, and only when the actual rotation speed becomes slower than the reference rotation speed, the control advance angle β ₂ is decreased by the deviation. control in the direction of If the control advance angle β ₂ of TCR 2 is made too small, there is a risk that commutation margin angle will be insufficient and commutation failure will occur. Therefore, in order to prevent commutation failure, β ₂
Determine the minimum value β ₂ min, and add the ability as a limiter to this value.

The input signal discrimination circuit 52 receives the operation mode signal 4
9. The three inputs are the first torque direction output signal 53 which is the output signal of TCR1 and the second torque direction output signal which is the output signal of TCR2. 2
The torque direction output signal and, during the speed equalization period, the first torque direction output signal 53 are discriminated and outputted as a control advance angle output signal 54 to the load side automatic pulse phase shift circuit (APPS2) 26. This APPS2 outputs a firing pulse proportional to the control advance output signal 54 to the thyristor gate control device 17 through the load-side pulse amplification circuit 27, thereby optimally controlling the firing phase of the thyristor.

By controlling in this way, when the runner loss increases and the rotation rise time of the generator motor 10 becomes slower, a deviation between the reference rotation speed and the actual rotation speed occurs,
The TCR 2 controls the control advance angle output signal 54 in the direction of decreasing the control advance angle β ₂ so as to eliminate the deviation. Then, the generated torque shown in equation (1) increases, and the control is continued until the deviation from the reference rotation speed becomes zero. Thus, always in this example:
It is possible to perform control that follows the reference rotation speed,
Efficient operation of the power system is possible through constant startup time control. Note that the current feedback signal 51 changes to β ₂ when the current is large, that is, 100% or more while the control advance angle β 2 is being controlled by the TCR ₂ .
This is to ensure that the commutation margin angle is set to β ₂ min.

FIG. 6A is a characteristic diagram showing changes in the DC current and changes in the rotational speed of the water turbine at the time of starting the generator motor of this embodiment, and FIG. 6B is a characteristic diagram of the control advance angle. 6th
As shown in FIG. A, in this embodiment, there is no delay in the startup time and it is always constant. Also, Figure 6B
As shown in , the control advance angle β ₁ 56 is constant and serves as the upper limit of the advance angle. Reference numeral 57 indicates the control advance angle β ₂ min, and the control advance angle β changes between β ₁ and β ₂ min.

By the way, if the minimum control advance angle is βmin, the weight angle U (numeral 34 in FIG. 6) and the final commutation margin angle (numeral 33 in FIG. 6) have a relationship as shown by the following equation.

cosβmin=cosγmin−KU・I ₄ …(2) γmin=βmin−U However, Id indicates a direct current, and K indicates a proportionality constant. Since the weight angle U is proportional to the DC current and commutation reactance, U can be kept constant by controlling the DC current to be constant using ACR. Note that the commutation reactance is a constant value determined by the main circuit constant.

Therefore, from equation (2), γmin can be ensured by keeping βmin constant. Normally, γmin is set with a margin of about 1.5 times, so β ₂ min
is set as shown in the following equation.

β ₂ min = γmin × 1.5 (3) From the above, if the control advance angle β ₂ is allowed to move freely within the range surrounded by the control advance angles β ₁ and β ₂ min, the generator motor 10 Generated torque can be varied.

FIG. 7 is a limiter characteristic diagram of the control advance angle of this embodiment. In the characteristic diagram of FIG. 4, a limiter characteristic 58 of control advance angle β ₂ is provided. These codes 36 and
The control advance angle can be moved within the range surrounded by 58 to reliably prevent commutation failure, and the generated torque can be varied to keep the startup time constant.

Further, the control which is a characteristic part of this embodiment is used only when starting and accelerating the generator motor 10,
During regenerative braking, conventional control can be performed by switching to the TCR1 output, that is, the first torque direction output signal 53, based on the MCR output, that is, the operation mode signal.

According to this embodiment, the second torque direction control circuit 5
0, the control advance angle β ₂ is decreased in the area surrounded by β ₁ and β ₂ min in response to an increase in the runner loss of the generator motor 10, and the torque of the generator motor 10 is increased. This has the effect of making the startup time of the generator motor constant, which has the effect of accurately grasping the load state of the power system and performing efficient system operation.

As described above, according to the thyristor starting device for a generator motor of the present invention, it is possible to control the starting time of the generator motor so that it is always constant.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a conventional thyristor starting device for a generator motor, Fig. 2 is a detailed block diagram showing an example of the structure of the thyristor control protection device shown in Fig. 1, and Fig. 3 is a starting block diagram of a generator motor. Fig. 4 is a control advance angle characteristic diagram, and Fig. 5 is a control advance angle limiter characteristic diagram.
The figure is a detailed configuration diagram of a thyristor control protection device which is a main part of an embodiment of a thyristor starting device for a generator motor of the present invention, and FIG. 6 is a control advance angle characteristic diagram at the time of starting the generator motor of this embodiment. FIG. 7 is a characteristic diagram of the control advance angle limiter of this embodiment. 4... Forward converter, 6... Inverse converter, 10... Generator motor, 12... Thyristor control protection device, 1
5... Operation command device, 17... Gate control device,
20...Speed control circuit, 22...Operation mode control circuit, 25...Torque direction control circuit, 26...Load side automatic pulse phase shift circuit, 29...Speed detection detection circuit, 46...Reference rotation speed generation circuit , 47... Rotation speed addition switching circuit, 50... Second torque direction control circuit, 52... Input signal discrimination circuit.

Claims (1)

[Scope of Claims] 1. A forward converter 4 configured with a thyristor and converting AC power into DC power; an inverse converter 6 configured with a thyristor and converting the output power of the forward converter 4 into AC power; Electrical quantity detectors 13 and 14 that detect the electrical quantity on the input side of the forward converter 4, a position detector 11 that detects the rotational position of the generator motor 10, a start command, electrical quantity detectors 13 and 14, and a position detector. a pulse signal generating means 12 that generates a pulse signal for controlling the forward converter and a pulse signal for controlling the inverse converter based on the output signal of the forward converter 4 according to each pulse signal generated by the pulse signal generating means 12; and a gate control means 17 that sequentially applies a gate pulse signal to the gate of each thyristor of the inverter 6, and the output side of the inverter 6 is connected to the generator motor 10, and the pulse signal generating means 12 includes: The generator motor 10 is detected from the output signal of the position detector 11.
an actual rotation speed detection means 29 that detects the actual rotation speed of the rotation speed detection means 29; a rotation speed command generation means 20 that generates a rotation speed command from the startup command and the detection output of the actual rotation speed detection means 29; An operation mode determination means 22 that determines the operation mode based on the detection output of the rotation speed detection means 29, and a rotation speed command generation unit that generates a pulse signal for controlling the forward converter 4 to make the output current of the forward converter 4 a specified current. Forward converter control pulse signal generating means 21 and 23 are generated from the rotational speed command output from the means 20 and the detection outputs of the electric quantity detectors 13 and 14, and the gate pulse signal for controlling the thyristor of the inverse converter 6 is Control advance angle constant control signal output means 25 that outputs a control advance angle constant control signal for keeping the angle constant; and an inverse converter 6 that monitors the output of the position detector 11.
control signal output means 29, 46, 4 for outputting a control signal for adjusting the control advance angle for adjusting the control advance angle of the gate pulse signal for the thyristor according to a change in the idling loss of the generator motor 10;
7, 50, when the operation mode determination means 22 determines that the operation mode is in the initial startup period, selects the control advance constant control signal, and when it is determined that the operation mode is in the acceleration period, selects the control advance angle constant control signal. A control signal selection means 52 for selecting an adjustment control signal; and an inverse converter control pulse signal generation means 26 for generating an inverse converter control pulse signal in accordance with the control signal selected by the control signal selection means 52. A thyristor starting device for a generator motor. 2 Control signal output means 29, 4 for control advance angle adjustment
6, 47, 50 are reference rotation speed signal output means 24, 46, 47 that output a reference rotation speed signal corresponding to the target reference speed during the acceleration period of the generator motor 10, and reference rotation speed signal output means 29, 46, 47 output reference rotation speed signal and the actual rotation speed detection means 29 output actual rotation speed signal to generate a control advance angle adjustment control signal for suppressing the deviation between the two to zero. A thyristor starting device for a generator motor according to claim 1, comprising means 50.