JPH10215600A - Generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a generator which can deal with SSR (shaft resonance) phenomenon, without relying on an prior analysis. SOLUTION: A turbine generator 1 comprises a turbine 2 and a generator 3, supplying an electric output to a DC power supply 5 through a main transformer 4. The DC power supply 5 comprises a transformer 6, power converters, i.e., thyristor converters 7, 8, a transformer 9, and a converter controller 10, wherein the transformer 9 supplies AC power to a counterpart AC system 11. 12 represents the turbine generator of another Ac power supply. Angular speeds ω1, ω2 at the opposite end parts of the rotary shaft of the generator 3 and the effective power P of the generator 3 are detected, and detection signals are delivered to an SSR monitor 13. Based on these input signals, the SSR monitor 13 delivers an SSR detection signal to the converter controller 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generator having a function of preventing excessive shaft resonance (SSR: Subsynchronous Resonance) of a generator.

[0002]

2. Description of the Related Art FIG. 9 is a schematic diagram showing the configuration of a conventional power generator, which includes a turbine generator and a DC power supply and performs DC power transmission and AC power transmission simultaneously. In this figure, a turbine generator device 1 includes a turbine 2 and a generator 3, and an electric output of the generator 3 is supplied to a DC power supply device 5 via a main transformer 4. . The DC power supply device 5 includes a transformer 6, thyristor converters 7 and 8, which are power converters, a transformer 9, and a converter control device 10. It is supplied to. Reference numeral 12 denotes a turbine generator of another AC power supply. Generally, a turbine generator device is not used alone, and power is supplied to a customer by a plurality of turbine generator devices operating in parallel. Incidentally, recently, in order to improve the stability of the power system, connection of a DC transmission system to an AC power system has been actively performed.

[0003] Next, the operation of the conventional power generator configured as described above will be described. The turbine generator device 1 includes:
The mechanical output of the turbine 2 is converted into an electrical output by a generator 3 and supplied to a DC power supply 5 via a main transformer 4. The AC power supplied to the DC power supply 5 is first input to the thyristor converter 7 via the transformer 6,
It is converted from AC power to DC power. This DC power is transmitted through a transmission line and converted into AC power by the thyristor converter 8. This AC power is supplied to the transformer 9
Is supplied to the other party's AC system 11. The converter control device 10 performs phase angle firing control of the thyristor of the thyristor converter 7 based on detection of an alternating current flowing from the thyristor converter 8 to the thyristor converter 7.

By the way, generally, in the phase angle control of the thyristor performed by the converter controller 10, the frequency (lower harmonics) several times higher than the commercial AC frequency is caused by the imbalance of the ignition at the time of the ignition angle control. ) Reveals that slight power fluctuations are transferred between the DC transmission system and the AC system. As shown in the explanatory diagram of FIG. 10, the power fluctuation of the low-order harmonic causes a change in the phase angle of the turbine generator device 1 and the shaft torsional vibration of the entire shaft system of the generator 3 and the turbine 2. . When the frequency of the shaft torsional vibration matches the natural frequency of the shaft system, an excessive shaft torsional vibration phenomenon, that is, SSR may occur in the shaft system. In particular, it has been found that when the DC power supply device 5 and the turbine generator device 1 are connected one-to-one, the possibility that the SSR phenomenon occurs is significantly increased.

Conventionally, such an SSR phenomenon has been dealt with by employing a method as shown in FIG. That is, first, various system condition data is collected (step 1), and the data is input to a computer to perform analysis calculation in advance (step 2).
Then, it is determined whether or not the target system is a system in which the SSR phenomenon can occur (step 3). If it is determined that the system can occur, for example, the control of the converter control device 10 of the DC power supply device 5 is performed. Take measures such as changing the method (step 4). Next, after performing the analysis calculation of step 2 again, the determination of step 3 is performed. Then, the same processing is repeated until it is determined in step 3 that there is no possibility that the SSR phenomenon occurs.

[0006]

However, the above-mentioned conventional SS
The response to the R phenomenon is mainly based on pre-analysis,
If the system conditions change, a new pre-analysis must also be performed. And in the above-mentioned prior art,
Since the state variables of the generator are not actually monitored, there has been a problem that when the system conditions change, there remains a concern about whether or not the generator can be normally operated normally.

In particular, since the electric power system in recent years has become increasingly complicated, it is conceivable that a plurality of DC transmission systems are connected to an AC system. In such a case, various system connection conditions are required. It is expected that it will be more and more difficult to perform pre-analysis taking into account

Further, in the conventional method, when an SSR phenomenon occurs in a case where the analysis condition is omitted, an appropriate countermeasure cannot be taken and a serious accident may occur.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power generator capable of coping with the SSR phenomenon without relying on prior analysis.

[0010]

Means for Solving the Problems As means for solving the above-mentioned problems, the invention according to claim 1 comprises a turbine, a turbine generator device comprising a generator connected to the turbine, a power converter, Having a power converter control device,
After converting the AC power from the turbine generator device into DC power by a power converter, a DC power supply device that converts the DC power to AC power and supplies the AC power to a partner AC system, An SSR monitoring device that monitors the occurrence or tendency of occurrence of the shaft torsional vibration of the generator, and outputs a detection signal to the power converter control device when the occurrence or tendency of the shaft torsional vibration is detected. It is characterized by the following.

According to a second aspect of the present invention, in the first aspect of the present invention, the SSR monitoring device inputs respective angular velocity detection values for both ends of a rotating shaft of the generator, and a deviation between the detection values. Angular velocity deviation calculating means for calculating the active power detection value of the generator, and calculating the active power change amount for calculating the active power change amount; the angular velocity deviation calculating means; Eigenshaft torsional vibration component separation means for outputting a vibration component signal of each eigenvibration frequency for the rotating shaft of the generator based on the input of each output signal from the power variation calculating means; and SSR detection means for outputting a detection signal on the occurrence or tendency of the torsional vibration of the generator based on the input of each vibration component signal from the separation means.

According to a third aspect of the present invention, in the second aspect of the present invention, the SSR detecting means inputs each vibration component signal or only a predetermined vibration component signal from the natural shaft torsional vibration component separating means, An instantaneous value measuring circuit that outputs the detection signal when these instantaneous values exceed predetermined threshold values is provided.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the SSR detecting means inputs each vibration component signal or only a predetermined vibration component signal from the natural shaft torsional vibration component separating means, When the average value exceeds each preset threshold value, an average value measurement circuit that outputs the detection signal is provided.

According to a fifth aspect of the present invention, in the second aspect of the present invention, the SSR detecting means inputs each vibration component signal or only a predetermined vibration component signal from the natural shaft torsional vibration component separating means, An instantaneous value measurement circuit that outputs a threshold excess signal when these instantaneous values exceed respective preset threshold values; and only each vibration component signal or a predetermined vibration component signal from the unique shaft torsional vibration component separation means. And an average value measurement circuit that outputs a threshold excess signal when the average value exceeds each preset threshold value, and outputs each threshold excess signal from the instantaneous value measurement circuit and the average value measurement circuit. A logic circuit that outputs the detection signal when a condition of a logical sum or a logical product of these threshold excess signals is satisfied,
It is characterized by having.

According to a sixth aspect of the present invention, in the second aspect of the invention, the SSR detecting means inputs each vibration component signal or only a predetermined vibration component signal from the natural shaft torsional vibration component separating means, When the values obtained by full-wave rectification of these signals exceed respective preset threshold values, a full-wave rectification value measurement circuit that outputs the detection signal is provided.

According to a seventh aspect of the present invention, in the second aspect of the present invention, the SSR detecting means inputs each vibration component signal or only a predetermined vibration component signal from the natural shaft torsional vibration component separating means, An instantaneous value measurement circuit that outputs a threshold excess signal when these instantaneous values exceed respective preset threshold values; and only each vibration component signal or a predetermined vibration component signal from the unique shaft torsional vibration component separation means. And a full-wave rectification value measurement circuit that outputs a threshold-exceeding signal when a value obtained by full-wave rectification of these signals exceeds a preset threshold value; the instantaneous value measurement circuit and the full-wave rectification value A logic circuit that outputs the detection signal when a condition of a logical sum or a logical product of the threshold value excess signals is input from the value measurement circuit. I do.

According to an eighth aspect of the present invention, in the second aspect of the present invention, the SSR detecting means inputs each vibration component signal or only a predetermined vibration component signal from the natural shaft torsional vibration component separating means, These signals are subjected to full-wave rectification and smoothing, and further include a differential value measurement circuit that outputs the detection signal when a value obtained by differentiating the smoothed value exceeds a preset threshold. There is a feature.

According to a ninth aspect of the present invention, in the second aspect of the present invention, the SSR detecting means inputs each vibration component signal or only a predetermined vibration component signal from the natural shaft torsional vibration component separating means, An instantaneous value measurement circuit that outputs a threshold excess signal when these instantaneous values exceed respective preset threshold values; and only each vibration component signal or a predetermined vibration component signal from the unique shaft torsional vibration component separation means. And a full-wave rectification and smoothing of these signals, and furthermore, when a value obtained by differentiating the smoothed value exceeds each preset threshold, a differential value measuring circuit for outputting a threshold excess signal And a logic circuit that receives each of the threshold excess signals from the instantaneous value measurement circuit and the differential value measurement circuit, and outputs the detection signal when the condition of the logical sum or the logical product of these threshold excess signals is satisfied. To Characterized in that it is intended to.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. However, the same components as those in FIG. 9 are denoted by the same reference numerals, and redundant description will be omitted. FIG.
1 is a schematic diagram illustrating a configuration of a power generation device according to an embodiment of the present invention. FIG. 1 differs from FIG. 9 in that an SSR monitoring device 13 for monitoring the SSR phenomenon of the turbine generator device 1 is provided, and when the SSR monitoring device 13 detects the occurrence or tendency of shaft torsional vibration. The point is that the detection signal to be output is sent to the converter control device 10.

The SSR monitoring device 13 has been put into practical use with the recent development of sensor technology. The angular velocities ω 1 and ω 2 at both ends of the rotating shaft of the generator 3 and the SSR monitoring device 13 Based on the input of the active power P, the torsional vibration applied to the shaft system of the turbine 2 and the generator 3 is to be monitored online.

FIG. 2 shows the SSR monitor 13 in FIG.
FIG. 3 is a block diagram showing the configuration of FIG. As shown in this figure,
The SSR monitoring device 13 includes an angular velocity deviation calculator 14, an active power change calculator 15, a natural shaft torsional vibration component separator 16, and an SSR detector 17. And
The SSR detecting means 17 has an instantaneous value measuring circuit 18 therein, and the configuration in which the SSR detecting means 17 has the instantaneous value measuring circuit 18 is the first embodiment of the present invention.

Next, the operation of the first embodiment configured as described above will be described. Similar to the conventional device shown in FIG. 9, the turbine generator device 1 converts the mechanical output of the turbine 2 into an electrical output by the generator 3 and converts the mechanical output into a main transformer 4.
To the DC power supply 5 via the. The AC power supplied to the DC power supply 5 is first input to the thyristor converter 7 via the transformer 6, and is converted from AC power to DC power. This DC power is transmitted through a transmission line and converted into AC power by the thyristor converter 8.
This AC power is transmitted to the other AC system 1 via the transformer 9.
1 is supplied. The converter control device 10 performs phase angle firing control of the thyristor of the thyristor converter 7 based on detection of an alternating current flowing from the thyristor converter 8 to the thyristor converter 7.

At this time, the signal detectors not shown in FIG. 1 detect the angular velocities ω 1 and ω 2 at both ends of the rotating shaft of the generator 3 and the active power P of the generator 3, respectively.
These detection signals are output to the SSR monitoring device 13.
Then, as shown in FIG. 2, the angular velocity deviation calculating means 14 inputs the respective angular velocities ω1 and ω2, and calculates and outputs these angular velocity deviations △ ω based on these inputs. Further, the active power change calculating means 15 inputs the active power P, and calculates and outputs the active power change ΔP based on the input.
The natural axis torsional vibration component separating means 16 receives the angular velocity deviation △ ω from the angular velocity deviation calculating means 14 and the active power change △ P from the active power change calculating means 15 and receives a vibration component for each natural vibration frequency. (For example, a signal indicating the amount of change in the torque signal for each natural frequency) is output to the SSR detecting means 17.

Instantaneous value measuring circuit 1 in SSR detecting means 17
Reference numeral 8 stores a preset threshold value for the vibration component for each natural vibration frequency, and compares each vibration component signal input from the natural shaft torsion vibration component separation means 16 with this threshold value. When any of the vibration component signals exceeds the threshold, the instantaneous value measurement circuit 18 generates an SSR detection signal indicating that the torsional vibration of the generator 3 has occurred or that the torsional vibration tends to occur. Is output.

This SSR detection signal is sent to the converter control device 10 shown in FIG. 1, and the converter control device 10 changes the control method or control conditions for the thyristor converter 7 to prevent the occurrence of the SSR phenomenon. Perform effective control.

1 and 2 described above, the turbine generator device 1 in which the change due to the SSR phenomenon appears most conspicuously
The purpose of the present invention is to monitor the torsional vibration of the shaft on-line and directly detect the occurrence or tendency of the occurrence of the SSR phenomenon. Therefore, it is possible to more reliably grasp whether or not the power generator is operating normally without relying on the prior analysis as in the past, and to enhance the safety against a serious accident caused by the SSR phenomenon. Can be.

FIG. 3 is a block diagram showing the configuration of the SSR detecting means 17 of the second embodiment. S of this embodiment
The SR detecting means 17 has an average value measuring circuit 19 instead of the instantaneous value measuring circuit 18 in the first embodiment. That is, the average value measuring circuit 19 in FIG.
Calculates the average value of each of the vibration component signals from the natural shaft torsion vibration component separation means 16 and calculates the level of the average value of these vibration component signals with a threshold value set in advance for each of them. Compare. If the average value of any of the vibration component signals exceeds the threshold, the average value measurement circuit 19 determines that the torsional vibration of the generator 3 has occurred,
Or S, which means that the torsional vibration tends to occur.
An SR detection signal is output.

In the first embodiment, the SSR detecting means 17 detects the SSR phenomenon based on the instantaneous value of the vibration component signal from the eigenshaft torsional vibration component separating means 16. Depending on the conditions, this second
As in the embodiment described above, detection based on the average value of the vibration component signal may be more preferable. That is, the first
In addition to the embodiment, since the detection of the SSR phenomenon according to the second embodiment can be executed, the range of choice of the optimum detection method of the SSR phenomenon is expanded, and the SSR phenomenon corresponding to each system condition is expanded. Can be detected.

FIG. 4 shows the SSR detecting means 1 of the third embodiment.
7 is a block diagram showing a configuration of FIG. SS of this embodiment
The R detection means 17 has both the instantaneous value measurement circuit 18 and the average value measurement circuit 19 in the first and second embodiments, and further has a logic circuit 20.

That is, the instantaneous value measuring circuit 18 outputs a threshold excess signal when the instantaneous value of any of the vibration component signals from the natural shaft torsion vibration component separation means 16 exceeds the threshold.
Similarly, the average value measuring circuit 19 outputs a threshold excess signal when the average value of any of the vibration component signals from the unique shaft torsion vibration component separation means 16 exceeds the threshold value. Logic circuit 2
0 takes the logical sum or logical product of the threshold value excess signals from the instantaneous value measuring circuit 18 and the average value measuring circuit 19, and outputs an SSR detection signal when these logical conditions are satisfied.

Here, whether the logic circuit 20 calculates the logical sum or the logical product of the threshold excess signals is determined in consideration of the actual system conditions and other conditions. For example, when an SSR detection signal is output, necessary measures must be taken to prevent an accident, such as changing the control method or stopping the operation, so that the operation efficiency of the system may be temporarily reduced. However, if safety is to be prioritized at the expense of such a temporary decrease in operating efficiency, the logical sum should be calculated. To take.

Since the third embodiment corresponds to a configuration obtained by combining the configurations of the first and second embodiments,
It is possible to further expand the range of choice of the optimum detection method for the SSR phenomenon, and to select the SSR corresponding to each system condition.
The SR phenomenon can be detected.

FIG. 5 is a block diagram showing the configuration of the SSR detecting means 17 according to the fourth embodiment. S of this embodiment
The SR detection means 17 has a full-wave rectification measurement circuit 21 instead of the instantaneous value measurement circuit 18 in the first embodiment. That is, the full-wave rectification measurement circuit 2 in FIG.
1 is to input each vibration component signal from the natural axis torsion vibration component separation means 16 and perform full-wave rectification of these signals,
The levels of these full-wave rectified vibration component signals are compared with preset threshold values. If any one of the full-wave rectified vibration component signals exceeds the threshold, the full-wave rectification measurement circuit 21 indicates that the torsional vibration of the generator 3 has occurred or the torsional vibration tends to occur. Is output.

By adding the detection of the SSR phenomenon according to the present embodiment, it is possible to further widen the selection range of the optimum detection method for the SSR phenomenon, and to detect the SSR phenomenon corresponding to each system condition. it can.

FIG. 6 shows the SSR detecting means 1 of the fifth embodiment.
7 is a block diagram showing a configuration of FIG. SS of this embodiment
The R detection means 17 has both the instantaneous value measurement circuit 18 and the full-wave rectification measurement circuit 21 in the first and fourth embodiments, and further has a logic circuit 20.

That is, the instantaneous value measuring circuit 18 outputs a threshold excess signal when the instantaneous value of any of the vibration component signals from the natural shaft torsional vibration component separation means 16 exceeds the threshold value.
Similarly, the full-wave rectification measurement circuit 21 outputs a threshold-exceeded signal when any of the full-wave rectified vibration component signals from the unique shaft torsion vibration component separation means 16 exceeds a threshold. The logic circuit 20 calculates a logical sum or a logical product of the threshold excess signals from the instantaneous value measurement circuit 18 and the full-wave rectification measurement circuit 21,
When these logical conditions are satisfied, an SSR detection signal is output.

Here, the determination as to whether the logic circuit 20 calculates the logical sum or the logical product of the threshold excess signals in consideration of the actual system conditions and other conditions will be described in the third. This is the same as in the embodiment. This fifth
The embodiment of the present invention corresponds to a configuration in which the configurations of the first and fourth embodiments are combined, so that the range of choice of the optimal detection method for the SSR phenomenon can be further expanded, and The corresponding SSR phenomenon can be detected.

FIG. 7 is a block diagram showing the configuration of the SSR detecting means 17 according to the fifth embodiment. S of this embodiment
The SR detecting means 17 has a differential value measuring circuit 22 instead of the instantaneous value measuring circuit 18 in the first embodiment. That is, the differential value measurement circuit 22 in FIG.
Is inputted with each vibration component signal from the natural shaft torsional vibration component separation means 16, full-wave rectifies and smoothes these signals, and further differentiates the smoothed value, and sets a value in advance for each of them. The threshold value. Then, when any of the vibration component signals that have been subjected to full-wave rectification and differentiated exceeds the threshold value, the differential value measurement circuit 22 indicates that the torsional vibration of the generator 3 has occurred, or that the torsional vibration has a tendency to occur. And outputs an SSR detection signal indicating that this is the case.

In the fifth embodiment, since the vibration component signal subjected to full-wave rectification is differentiated, the rate of change of the vibration component is taken into account in comparison with the threshold value. Therefore,
In general, it can be expected that the accuracy of determining the occurrence or tendency of the occurrence of the SSR phenomenon will be further improved (however, depending on the specific circumstances of the system connection conditions, whether the determination based on the differentiation of the vibration component is always the best) Can not be said unconditionally.).
By adding the detection of the SSR phenomenon according to the present embodiment, it is possible to further widen the range of selection of an optimal detection method for the SSR phenomenon, and to detect the SSR phenomenon corresponding to each system condition.

FIG. 8 shows the SSR detecting means 1 of the seventh embodiment.
7 is a block diagram showing a configuration of FIG. SS of this embodiment
The R detecting means 17 has both the instantaneous value measuring circuit 18 and the differential value measuring circuit 22 in the first and sixth embodiments, and further has a logic circuit 20.

That is, the instantaneous value measuring circuit 18 outputs a threshold excess signal when the instantaneous value of any of the vibration component signals from the natural shaft torsion vibration component separation means 16 exceeds the threshold value.
Similarly, the differential value measurement circuit 22 also outputs a threshold excess signal when any of the full-wave rectified and differentiated vibration component signals from the intrinsic shaft torsional vibration component separation means 16 exceeds the threshold. The logic circuit 20 takes a logical sum or a logical product of the threshold value excess signals from the instantaneous value measuring circuit 18 and the differential value measuring circuit 22, and outputs an SSR detection signal when these logical conditions are satisfied.

Here, the determination as to whether the logic circuit 20 takes the logical sum or the logical product of the respective threshold-exceeding signals in consideration of the actual system conditions and other conditions is made in the third manner. This is the same as the case of the embodiment and the fifth embodiment. Since the seventh embodiment corresponds to a configuration in which the configurations of the first and sixth embodiments are combined, S
The range of choices for the optimal detection method for the SR phenomenon can be further expanded, and the SS
The R phenomenon can be detected.

Note that the SSR in each of the above embodiments is
The detecting means 17 outputs the SSR detection signal based on the input of the vibration component signal for each natural vibration frequency from the natural axis torsional vibration component separating means 16, but a predetermined certain specific The SSR detection signal may be output based on the input of only the vibration component signal related to the natural vibration frequency.

[0044]

As described above, according to the present invention,
It is not necessary to perform pre-analysis or the like as in the prior art, and the SSR phenomenon can be directly detected. And SSR
If a phenomenon occurs or is likely to occur, change the control method using the converter control unit of the DC power supply unit, switch over, or take measures to stop the turbine generator unit promptly. Can be.

Further, the power system in recent years has become more and more complicated, and it is conceivable that a plurality of DC transmission systems may be connected to an AC system. There is no need to do it. Further, even when the pre-analysis is performed, it is possible to sufficiently protect the turbine and the generator in the event that the SSR phenomenon occurs in the case where the analysis condition is leaked.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a power generation device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an SSR monitoring device 13 in FIG. 1 according to the first embodiment of the present invention.

FIG. 3 shows an SSR detecting unit 17 according to a second embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of FIG.

FIG. 4 shows an SSR detecting unit 17 according to a third embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of FIG.

FIG. 5 shows an SSR detecting means 17 according to a fourth embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of FIG.

FIG. 6 shows an SSR detecting unit 17 according to a fifth embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of FIG.

FIG. 7 shows an SSR detecting unit 17 according to a sixth embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of FIG.

FIG. 8 shows an SSR detecting unit 17 according to a seventh embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of FIG.

FIG. 9 is a schematic diagram showing a configuration of a conventional power generation device.

FIG. 10 is a diagram illustrating the cause of the occurrence of the SSR phenomenon.

FIG. 11 is a flowchart for explaining a conventional pre-analysis method for the SSR phenomenon.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Turbine generator device 2 Turbine 3 Generator 4 Main transformer 5 DC power supply device 6 Transformer 7 Thyristor converter 8 Thyristor converter 9 Transformer 10 Converter control device 11 Partner AC system 12 Turbine generator device 13 SSR monitoring device 14 Angular velocity deviation calculating means 15 Active power change calculating means 16 Unique shaft torsion vibration component separating means 17 SSR detecting means 18 Instantaneous value measuring circuit 19 Average value measuring circuit 20 Logic circuit 21 Full-wave rectification measuring circuit 22 Differential value measuring circuit

Claims (9)

[Claims] 1. A turbine generator device comprising a turbine, a generator connected to the turbine, a power converter and a power converter control device, wherein AC power from the turbine generator device is converted into a power converter. And a DC power supply that converts the DC power to AC power and supplies the AC power to the other AC system.In the power generator, comprising: A power generator, comprising: an SSR monitoring device that monitors presence / absence and detects occurrence or tendency of torsional vibration, and outputs a detection signal to the power converter control device. 2. The power generation device according to claim 1, wherein the SSR monitoring device inputs angular velocity detection values for both ends of the rotating shaft of the generator, and calculates a deviation between these detection values. Calculating means, an active power detection value of the generator is input, an active power change calculating means for calculating an active power change calculating an active power change, an angular velocity deviation calculating means and an active power change calculating means. Based on the input of each output signal from the eigenshaft torsional vibration component separating means for outputting a vibration component signal of each natural vibration frequency for the rotating shaft of the generator, SSR detection means for outputting a detection signal on the occurrence or tendency of torsional vibration of the generator based on the input of the vibration component signal. 3. The power generator according to claim 2, wherein said SSR detecting means inputs each vibration component signal or only a predetermined vibration component signal from said eigenshaft torsional vibration component separating means, and said instantaneous value is A power generator, comprising: an instantaneous value measurement circuit that outputs the detection signal when each of the thresholds exceeds a preset threshold. 4. The power generator according to claim 2, wherein said SSR detection means inputs each vibration component signal or only a predetermined vibration component signal from said eigenshaft torsional vibration component separation means, and calculates an average value of these signals. A power generator comprising: an average value measuring circuit that outputs the detection signal when each of the thresholds exceeds a preset threshold. 5. The power generator according to claim 2, wherein said SSR detecting means inputs each vibration component signal or only a predetermined vibration component signal from said inherent shaft torsion vibration component separating means, and these instantaneous values are An instantaneous value measurement circuit that outputs a threshold-exceeding signal when each of the predetermined thresholds is exceeded, and inputs only each vibration component signal or a predetermined vibration component signal from the unique shaft torsional vibration component separation means, An average value measurement circuit that outputs a threshold excess signal when the average value of each of the threshold values exceeds a preset threshold value, and inputs each of the threshold excess signals from the instantaneous value measurement circuit and the average value measurement circuit. And a logic circuit that outputs the detection signal when a condition of a logical sum or a logical product of the excess signals is satisfied. 6. The power generator according to claim 2, wherein said SSR detecting means inputs each vibration component signal or only a predetermined vibration component signal from said eigenshaft torsional vibration component separating means, and outputs all of these signals. A power generator comprising: a full-wave rectified value measurement circuit that outputs the detection signal when the value of the wave rectified value exceeds each preset threshold value. 7. The power generator according to claim 2, wherein said SSR detecting means inputs each vibration component signal or only a predetermined vibration component signal from said inherent shaft torsional vibration component separating means, and these instantaneous values are An instantaneous value measurement circuit that outputs a threshold-exceeding signal when each of the predetermined thresholds is exceeded, and inputs only each vibration component signal or a predetermined vibration component signal from the unique shaft torsional vibration component separation means, A full-wave rectification value measurement circuit that outputs a threshold-exceeding signal when a value obtained by full-wave rectification of the signal exceeds a preset threshold; and the instantaneous value measurement circuit and the full-wave rectification value measurement circuit And a logic circuit that receives each of the threshold excess signals and outputs the detection signal when a condition of a logical sum or a logical product of the threshold excess signals is satisfied. 8. The power generator according to claim 2, wherein said SSR detecting means inputs each vibration component signal or only a predetermined vibration component signal from said inherent shaft torsion vibration component separating means, and outputs these signals as a whole. And a differential value measuring circuit that outputs the detection signal when a value obtained by differentiating the smoothed value exceeds a predetermined threshold value. Power generator. 9. The power generator according to claim 2, wherein said SSR detecting means inputs each vibration component signal or only a predetermined vibration component signal from said inherent shaft torsional vibration component separating means, and these instantaneous values are An instantaneous value measurement circuit that outputs a threshold-exceeding signal when each of the predetermined thresholds is exceeded, and inputs only each vibration component signal or a predetermined vibration component signal from the unique shaft torsional vibration component separation means, A full-wave rectification and smoothing of the signal, and further, when a value obtained by differentiating the smoothed value exceeds each preset threshold, a differential value measurement circuit that outputs a threshold excess signal, and the instantaneous value A logic circuit for receiving each of the over-threshold signals from the measurement circuit and the differential value measurement circuit, and outputting the detection signal when a condition of a logical sum or a logical product of these over-threshold signals is satisfied. Power generator, characterized in that.