JPH09195920A - Controller for hydraulic power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability and control performance by multiplexing a control device without drastically increasing costs. SOLUTION: A computer controller 7 is provided with a guide vane controlling computer controller 7-1 and a runner vane controlling computer controller 7-2, and a guide vane actuator 8 and a runner vane actuator 9 are controlled in cooperation with each other through signal output units 7-1-1, 7-2-1 in the final stage of guide vane control and signal output units 7-1-2, 7-2-2 in the final stage of runner vane control. When one computer controller fails, the cooperation of both sides is cut off, and the other computer controller controls the actuator to be originally controlled by the failing computer controller through the signal output units in the final stage and safely stops a water turbine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a hydroelectric power plant, and more particularly to a control device for a hydroelectric power plant having a plurality of control elements.

[0002]

2. Description of the Related Art S249A electric calculation (J
PN) 54 (8) 292-301 ('86) "All Digital Control of Hydropower Plants".
In order to improve the reliability of the computer, a dual system consisting of two computer control units that can operate independently of each other is adopted, and when a failure is detected in one, the normal system in the other automatically operates. Are configured to give priority to the output of.

As a combination of computer control units having different functions in the control unit of the hydroelectric power plant,
For example, JP-A-6-54598 or JP-A-6-54598.
The one described in Japanese Patent No. 288334 is known.

[0004]

However, in the former conventional device, the structure of complete duplication by the same computer control device is adopted as a means for improving reliability against computer failure, and when one of them fails, it is immediately Since it is configured to be switched to the normal system, there is a problem that the cost is significantly increased as compared with the control device of the single system.

Further, in the case of the complete duplex configuration, even if there are a plurality of control elements in the hydroelectric power plant, one control device controls a plurality of elements, so that if a failure occurs, all the control elements will be controlled. Cannot be controlled. Therefore, if one of the control devices fails and operation is continued with the system switched to the normal system, it is simply the same as the single system, and if a failure occurs in this state, all control becomes impossible. , The hydropower plant goes into an uncontrolled state. In such an uncontrolled state, there is a high possibility that a serious accident will develop, which is very dangerous, and there was a problem in reliability.

Further, in the dual configuration, since one computer control device performs all the control, especially in the case of controlling a plurality of control elements, the calculation time of the computer becomes long and rough control is not performed. Inevitably, there was a problem that control performance was degraded.

Further, the latter prior art does not disclose the technical idea of monitoring a failure of another control device or another control device and always executing control on the safe side when a failure occurs.

The present invention has been made in view of the circumstances of the prior art as described above, and the first object thereof is to provide a hydroelectric power generation system capable of multiplexing control devices without causing a significant increase in cost. To provide the control device of the place. A second object is to provide a control device for a hydroelectric power plant, which can prevent a decrease in reliability of the hydroelectric power plant having a plurality of control elements. Further, a third object is to provide a control device for a hydroelectric power plant, which can prevent deterioration of control performance of the hydroelectric power plant having a plurality of control elements.

[0009]

In order to achieve the above object, the present invention provides a computer control device and a control device for a hydroelectric power plant having at least two control elements controlled by the computer control device. A computer control device is provided for each of the control elements, the computer control device operates the control element in cooperation during normal operation, and cancels the cooperation operation when a failure occurs in any of the computer control devices. Another computer controller controls a control element controlled by the computer controller having the failure to control the hydroelectric power plant in a safe direction.

In this case, the control elements include a guide vane and a runner vane for adjusting the amount of water flowing into the water turbine. When a failure occurs in the computer control device, the normal computer control device issues a water turbine stop command. At the same time as outputting, it outputs a command for the runner vanes and the guide vanes to operate in a safe direction as a hydroelectric power plant. The turbine stop command is a command for a part that controls the entire generator or the entire power plant, and thereby the generator or the power plant is controlled to stop as a whole.

In addition to this, as the control element, a deflector and a needle for adjusting the amount of water flowing into the water turbine can be cited. When the number of the needles is plural, the control device is provided for each needle, and the computer is provided. When a failure occurs in the control device, the normal computer control device outputs a command to stop the water turbine, and at the same time outputs a command to operate the deflector and the needle as a hydroelectric power station in a safe direction.

The computer control device provided for each of the control elements may be composed of a central processing unit of the computer control device, and the peripheral devices can be common.

Further, a pressure suppressor provided on a path for supplying water to the water turbine side may be used as the control element.

When a Francis turbine having a single control element for adjusting the amount of water is used, an electric servomotor may be used as the control element. When such an electric servomotor is used, it is divided into two elements as a control element, that is, a motor control portion and a motor command control portion.

To detect an abnormality, the computer control unit is provided with an abnormality detection unit for detecting an abnormal state of another computer control unit and a signal output unit at the final stage of the computer control unit in the central processing unit of each computer control unit. The computer control device immediately outputs a turbine stop command when it detects an abnormality in the computer control device on the other side, and at the same time outputs a signal from the final stage of the computer control device on the other side in a safe direction as a hydraulic power plant. The control commands to the control unit and its own control element are switched. At that time, instead of the abnormality detection unit that detects the abnormal state of the central processing unit of the computer control device, the output signal at the final stage is constantly monitored, and when the rate of change of the output signal deviates from the preset range, It is also possible to determine that the central processing unit is in an abnormal state.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a schematic configuration diagram in which the control device for a hydroelectric power plant according to this embodiment is applied to a movable vane turbine.

The movable vane turbine transmits the rotational movement of the runner 1 to which the runner vane 4 is attached to the generator 2 directly connected via the shaft 11 to generate electric power. The output of the movable vane turbine is adjusted by controlling the amount of water flowing into the turbine by controlling the opening of the guide vane 3 and the angle of the runner vane 4. That is, the movable vane turbine is a turbine having two control elements, the guide vane 3 and the runner vane 4. The opening of the guide vanes 3 is controlled by operating the guide vane servomotor 5, and the angle of the runner vanes 5 is controlled by operating the runner vane servomotor 6.

To control the operation of the movable-blade turbine, the rotational speed or output frequency of the generator is taken into the computer controller 7,
A predetermined control calculation is performed by digital conversion, and the calculation result is output as a control command to the guide vane servo motor actuator 8 and the runner vane servo motor actuator 9. The guide vane servo motor actuator 8 and the runner vane servo motor actuator 9 output drive commands to the guide vane servo motor 5 and the runner vane servo motor 6, respectively, in accordance with the control commands from the computer controller 7. . In this embodiment, the computer control device 7
Independent guide vane control computer controller 7-1 for controlling the guide vane servomotor actuator 8 and the runner vane servomotor actuator 9, respectively.
And a runner vane control computer control device 7-2.

The guide vanes 3 and runner vanes 4 of the movable vane turbine are operated in cooperation with each other according to predetermined characteristics. However, when the turbine is stopped due to an accident or the like, the guide vane 3 is closed to shut off the water flowing into the turbine. On the other hand, the runner vane 4 is operated to open so as to generate a rotation loss, and control is performed so as to accelerate the rotation speed decrease time of the water turbine generator.

In the movable-blade turbine controlled in this manner, if one computer controller controls two control of the guide vane and the runner vane as in the conventional case, if a failure occurs in the computer controller. , Both guide vanes and runner vanes fall into a completely uncontrollable state. if,
If the guide vanes are fully opened and the runner vanes are fully closed, the rotational speed of the turbine will increase, and the thrust load will increase abnormally, which could result in a serious accident such as burnout or damage to the hydropower generator. Get higher

Here, FIG. 1 shows a block diagram of a computer control apparatus according to an embodiment of the present invention.

In the computer control unit 7 according to this embodiment, a computer control unit 7-1 for guide vane control that controls the guide vane control and a computer control unit 7-2 for runner vane control that controls the runner vanes are independently distributed. Has been done. Further, to each of the computer control devices 7-1 and 7-2, a control command is output to the guide vane servo motor actuator 8 that drives the guide vanes 3 and the runner vane servo motor actuator 9 that drives the runner vanes 4. Stage signal output units 7-1-1 and 7-1
-2, 7-2-1 and 7-2-2 are provided. Of these, the signal output units 7-1-1 and 7-2-1 are connected to the guide vane servomotor actuator 8 and the signal output unit 7
-1-2 and 7-2-2 output control signals to the runner vane servomotor actuator 9, respectively.

FIG. 3 is a flow chart showing an operation procedure of the runner vane control computer control device 7-2 in the case of the guide vane control computer control device 7-1 having the above configuration.

Computer controller 7-2 for runner vane control
Then, the computer controller 7-1 for guide vane control is constantly monitored for the occurrence of a failure, and when the failure occurs (step S1), a turbine stop command is immediately output (step S).
2) At the same time, the final stage signal output unit 7 for guide vane control
-2-1 outputs a closing command (steps S3, S
4). The final stage signal output unit 7-2-1 receives the closing command, and the guide vane servomotor actuator 8 outputs a closing direction drive command to the guide vane servomotor 5. Furthermore, the runner vane control computer control device 7-
In 2, it is confirmed that the guide vane 3 has started the closing operation (step S5), and the opening operation command is output to the final stage signal output unit 7-2-2 of the runner vane control. The final stage signal output unit 7-2-2 for the runner vane control receives the command and outputs an opening direction drive command to the runner vane motor actuator 9 (step S6). As a result, the runner vane 4 is opened by the runner vane servomotor 6.

Therefore, even if the computer controller 7-1 for controlling the guide vanes fails, the computer controller 7-2 for controlling the runner vanes operates to close the guide vanes 3 and open the runner vanes 4, so that the movable vane turbine is operated. Can be safely stopped as. Further, even if the runner vane control computer control device 7-2 fails, the guide vane control computer control device 7-1 operates, and the movable vane turbine can be safely stopped as described above.

On the other hand, the guide vane control computer control device 7-1 and the runner vane control computer control device 7-2.
Are independently distributed, the control load of each is reduced, and thus the control calculation speed can be increased and the control performance can be improved. Further, since the computer control device 7 is independently distributed for each control element, a computer with a small capacity can be adopted. At the same time, the control signal output unit for controlling the power station in a safe direction can be achieved by duplicating only the final stage, so that an inexpensive computer control device can be provided.

In another type of turbine, for example, a Pelton turbine, a deflector and a needle may be used instead of the guide vanes and runner vanes. When a plurality of needles are provided, a computer control device is provided for each needle. Should be provided. Further, as a control element, a pressure suppressor provided in a path for guiding water to the guide vane 3 side can be added, and the calculator control device may be provided for the pressure suppressor as well. In this case, there are three control systems. In addition, the control element that adjusts the amount of water flowing into the turbine is 1
Even a hydropower plant with two Francis turbines,
When the electric servomotor is used as the control device, the electric servomotor and another control device, in other words, the motor control part and the command control part for the motor can be distributed and configured in the same manner. In addition, it is natural that the turbine can be safely stopped in the same manner when a failure occurs in another type of turbine such as a tubular turbine.

As described above, according to this embodiment, since the computer control devices are distributed and arranged for each control element for adjusting the amount of water flowing into the water turbine of the hydroelectric power plant, it is possible to configure the computer with a small capacity. Therefore, it becomes possible to provide an inexpensive computer control device.

Further, when a failure occurs in one computer controller, a normal computer controller receives a failure output signal or automatically detects the failure and outputs a turbine stop command, and at the same time, it is safe as a hydraulic power plant. Since the controlled devices are operated in the direction, it is possible to avoid all the controlled devices from falling out of control due to the failure of one computer control device,
It is possible to provide a highly reliable computer control device capable of preventing a serious accident in a hydroelectric power plant from occurring.

Further, since the computer control device of the present invention is distributed and arranged for each control element of the hydroelectric power plant, the control calculation process shared by one computer control device has a relatively small capacity. Here, since the calculation speed is proportional to the control calculation amount, the calculation speed can be increased as compared with the conventional computer control device, and the control performance of the computer control device of the hydroelectric power plant is improved. be able to.

[0032]

As is apparent from the above description, according to the present invention, a computer control device is provided for each control element, and the computer control device operates the control elements in cooperation during normal operation. When any one of the control devices fails, the cooperative operation is released, and the normal computer control device controls the control element controlled by the computer control device in which the failure has occurred to move the hydroelectric power plant in a safe direction. Since the control is performed, the water turbine can be stopped safely even if any of the computer control devices fails, and the reliability of the hydroelectric power plant can be improved.

Further, since the computer control devices are distributed and arranged, the load on each computer control device is reduced, and the control speed can be improved and the cost can be reduced.
It is possible to provide a control device for a hydroelectric power plant that is inexpensive and has excellent control performance.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a computer control device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a movable blade turbine according to an embodiment of the present invention.

FIG. 3 is a flowchart showing an operation procedure showing an operation of another normal computer control device when a failure occurs in one computer control device according to the present invention.

[Explanation of symbols]

1 runner 2 generator 3 guide vane 4 runner vane 5 servo motor for guide vane 6 servo motor for runner vane 7 computer controller 7-1 computer controller for guide vane control 7-2 computer controller for runner vane control 7-1-1, 7-2-1 Final stage signal output unit of guide vane control 7-1-2, 7-2-2 Final stage signal output unit of runner vane control 8 Guide vane actuator 9 Runner vane actuator

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hideaki Imai 3-1-1 Sachimachi, Hitachi City, Ibaraki Prefecture Hitachi Ltd. Hitachi Works

Claims (9)

[Claims] 1. A controller for a hydroelectric power plant having a computer control device and at least two control elements controlled by the computer control device, wherein the computer control device is provided for each control element.
The computer control device operates the control elements in cooperation during normal operation, cancels the cooperation operation when a failure occurs in any of the computer control devices, and a normal computer control device performs computer control in which the failure occurs. A control device for a hydroelectric power plant, characterized by controlling a control element controlled by the device to control the hydroelectric power plant in a safe direction. 2. The control device for a hydraulic power plant according to claim 1, wherein the control elements are a guide vane and a runner vane that adjust the amount of water flowing into the turbine. 3. When a failure occurs in the computer control device, the normal computer control device outputs a command to stop the turbine, and at the same time outputs a command to operate the runner vanes and the guide vanes as a hydroelectric power plant in a safe direction. The control device for a hydroelectric power plant according to claim 2, wherein 4. The control device for a hydroelectric power plant according to claim 1, wherein the control elements are a deflector and a needle for adjusting the amount of water flowing into the turbine. 5. The control device for a hydraulic power plant according to claim 4, wherein the number of the needles is plural, and the computer control device is provided for each needle. 6. When a failure occurs in the computer control device, the normal computer control device outputs a water turbine stop command, and at the same time outputs a command to operate the deflector and the needle in a safe direction as a hydraulic power plant. The control device for a hydroelectric power plant according to claim 4 or 5, characterized in that: 7. The control device for a hydroelectric power plant according to claim 1, wherein the computer control device provided for each of the control elements comprises a central processing unit of the computer control device. 8. The control device for a hydraulic power plant according to claim 2, further comprising a pressure suppressor provided as a control element on a path for supplying water to the turbine side. 9. The control device for a hydraulic power plant according to claim 1, wherein the control element includes an electric servomotor.