JPH0617741A - Automatic control protection device for hydraulic turbine - Google Patents

Abstract

PURPOSE:To continue operation without damage to an apparatus even when an abnormality is caused in the apparatus by controlling a hydraulic turbine in compliance with apparatus abnormality information and operation command information. CONSTITUTION:When a generator output command is inputted to a command value selection condition part 11 via a remote control device A in a hydraulic power plant, any one of command values P1...Pn is inputted to an automatic computing part 8 of an automatic protection device B from the remote control device A. Upon input of the command values P1...Pn and an apparatus abnormality signal 2b from a state monitoring device, the automatic computing part 8 judges operation region LC, selects a control and a protection logics based thereon and changes a set value of the protection device. When an apparatus abnormality is caused during power generation operation, an automatic limiting control logic part 9, after processing by the automatic computing part 8, continues operation so as not to apply a burden to the apparatus. A setting change logic part 10, when a power demand degree is acute, changes a set value of the protection device in a setting change region in compliance with the operation region LC so as to continue the operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic control and protection device for a hydraulic power plant, which is intended to control and protect a turbine generator.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional example of a control / protection system for a hydroelectric power plant having a condition monitoring device. In the figure,
A is a remote control device that transmits an operation command from the control station to the hydroelectric power plant, and B is a operation command from the remote control device A. When the turbine generator is started and stopped and an abnormality occurs in the equipment. Is an automatic control protection device that safely stops the turbine generator, D is a detector that detects field equipment, C is a signal from the detector D that analyzes the change in the state of the equipment, and Each of the state monitoring devices for outputting an abnormality to the automatic control protection device B is shown.

Further, 1a is an operation command of the turbine generator output from the remote control device A to the automatic control protection device B, and 1b is a display signal for outputting the operating state of the power plant and the failure state of the equipment to the control station, 2a is a plant status signal that outputs the operating status of the plant to the status monitoring apparatus C, 2b is a device abnormality signal that outputs an abnormal status of the equipment from the status monitoring apparatus C, and 3 is a detection that is output from the detector D to the status monitoring apparatus C Each signal is shown.

Here, the automatic control protection device B shown in FIG.
The internal configuration will be described with reference to FIG. 6. The automatic control protection device B operates the turbine generator when the abnormality occurs in the control logic unit 4 that drives the turbine generator and the turbine generator while the turbine generator is operating. For outputting the plant state to the protection stop logic unit 5 for safely stopping, the alarm logic unit 6 for warning when an abnormality occurs in the equipment to the extent that it is not necessary to stop the turbine generator, and the condition monitoring device C. It is composed of a plant state output logic unit 7.

In the hydroelectric power station having the above-mentioned structure, the operation command from the control station is input to the automatic control protection device B as the operation command 1a via the remote control device A, and the automatic control protection device B determines in advance. The control logic unit 4 activates the water turbine generator and inserts it into the system in parallel for power generation operation.
A change in the state of each device is detected by a detector D attached to the site to monitor the device, and is input to the state monitoring device C as a detection signal 3.

In the state monitoring device C to which the detection signal 3 is input, the plant state signal 2a is input after the plant state output logic section 7 processes which state the plant is operating from the automatic control protection device B. The state change amount of the equipment is judged from the plant state signal 2a and the detection signal 3. If the amount of change is equal to or greater than the set value level in this determination,
As the device is abnormal, the device abnormality signal 2b is output to the automatic control protection device B. In this case, the alarm logic unit 6 outputs an alarm for an abnormality of a device that does not need to stop the water turbine generator. In addition, when the equipment is damaged so much that the operation needs to be stopped, the protection stop logic unit 5 quickly stops the turbine generator.

[0007]

However, the conventional automatic control protection device having the control means and the protection means has the following problem that it may not be possible to continue the operation of the turbine generator according to the power demand. .

That is, since the state of the equipment deteriorates with time if it is operated for a long time, the detection signal 3 from the detector D
Of course, there will be a large gap from the preset value, and it will be in a state where it is easy to enter the set range accompanied by an alarm and stop of the turbine generator.

[0009] In particular, in recent years, the demand for electric power during the peak power load in the summer has become extremely large, and the amount of power generated by a hydroelectric power plant has become more valuable power. When an abnormality occurs in the equipment of the power plant, in the conventional power plant, the turbine generator may be stopped by the predetermined protection means, and power may not be supplied to the grid.

In order to solve this, if the turbine generator can be operated without stopping immediately even if an abnormality occurs in the equipment depending on the power demand, the power generation operation is continued within a range that does not damage the equipment. In addition, it is necessary to change the set value for protection stop so that the turbine generator continues to operate up to the operable limit.

Therefore, the present invention provides an automatic control and protection device for a water turbine generator, which controls the device within a range that does not damage the device even if an abnormality occurs in the device and changes the set value of the protection device to continue the operation. The purpose is to provide.

[0012]

According to the present invention, a turbine generator is controlled based on equipment abnormality information output from a status monitoring device based on an operating state of a plant and an abnormal state of equipment and operation command information from a control station. In an automatic control and protection device for a water turbine generator that protects the water turbine generator, it is possible to determine one of a device normal operation region, an operation limit region, and a set value change operation region based on the operation command information and the device abnormality information. The operating area determination means and the operation area determination means control and protect the water turbine generator at a normal time which is predetermined when the equipment is operating normally, and stop the turbine generator when it is in the operation limit area. In addition, the limited operation control means is selected from among a plurality of limited operation control means set in advance based on the operating state of the water turbine generator in the set value change operation area, and While to change the setting value of the protection device in accordance with the set procedures to protect the water turbine generator is obtained by so providing the means for continuing operation.

[0013]

With the above structure, the operation area determination means determines the operation area based on the operation command information and the device abnormality information.
By this determination, the water turbine generator is controlled and protected in a predetermined normal condition in the normal operation range of the device. Further, the turbine generator is stopped and protected in the operation limit region. Further, in the set value change operation region, the limited operation control means is selected from among a plurality of limited operation control means preset based on the operating state of the water turbine generator, and the protection device of the protection device is set according to a preset procedure. The operation is continued while changing the set value to protect the turbine generator. As a result, even when an abnormality occurs in the equipment when the power demand is tight, the limited operation control means is selected, the control that does not damage the equipment is performed, and the set value is changed for protection. Thus, it becomes possible to continue the operation up to the limit of the operation continuation.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an automatic control protection device showing an embodiment of the present invention. In the figure, an automatic control protection device B is provided with a control logic unit 4, a protection stop logic unit 5, a plant state output logic unit 7, an automatic calculation unit 8, an automatic limit control logic unit 9, and a setting change logic unit 10. There is. Further, the remote control device A is provided with a command value selection condition section 11.

Here, the control logic unit 4 controls the turbine generator at a normal time by a predetermined logic. The protection stop logic unit 5 is used when the equipment abnormality occurs during the operation of the turbine generator. To stop safely. The plant status output logic unit 7 outputs a plant status signal 2a to the status monitoring device C. The automatic calculation unit 8 uses the command value P1,
P2 ... Pn and the device abnormality signal 2b output from the state monitoring device C are input to determine the operating region, the control and protection logic is selected by this, and the set value of the protection device not shown is changed. To do. Automatic limit control logic unit 9
When the abnormality occurs in the device during the power generation operation, the automatic calculation unit 8 processes the device and continues the operation without imposing a burden on the device. The setting change logic unit 10 changes the setting value of the protection device after the processing by the automatic calculation unit 8. The command value selection condition unit 11 inputs a condition for selecting a generator output command value according to the power demand from a control station (not shown), and command values P1, which are power command information to be an output command value of the power station. P2 ... Select Pn.

With the above configuration, the generator output command selected by the power demand level at the control station is the remote control device A of the hydroelectric power station.
Is input to the command value selection condition unit 11 via. Accordingly, one of the command values P1 ... Pn is input from the remote control device A to the automatic calculation unit 8 of the automatic control protection device B.
The automatic calculation unit 8 shown in FIG. 2 is preset from D1, D2, D3, D4 and D5 indicating the damage degree of the equipment output by the state monitoring device C and the command value P1 ... Pn as the power command information. The operating region of the turbine generator is determined based on the pattern of the operating determination table. The operation determination table shown in FIG. 2 shows the damage levels D1 to D5 of the equipment and the command values P1 ... Pn.
And are represented in the form of a matrix, and both correspond to L
The operating range is A, LB, LC, LD.

In the figure, D1 is the degree of damage in the state of the equipment during normal operation in which no abnormality occurs in the equipment, D2 is the degree of damage in the state of the equipment that does not hinder the continuation of the operation, and D3.
The damage of the equipment is larger than that of D2, but the damage degree that the turbine generator can be operated if the conditions are satisfied, and the damage degree of the equipment D4 is considerably large and the operation of the turbine generator is the limit. There is. Further, LA is an area where the turbine generator can continue to operate, LB is an area where the turbine generator continues to operate while outputting an alarm, LC is an area where the turbine generator is operated while outputting an alarm so as not to burden the turbine generator, and LD is a turbine generator. This is an area where the machine cannot continue to operate. Further, the command value increases in accordance with the command value P1 ... Pn.

Next, when the operation area is judged by the above-mentioned operation judgment table of the automatic calculation unit 8, control and protection are carried out according to the operation area.

Specifically, as shown in FIG. 3, the operating range L
In the case of A, as a normal operation range of the device, normal predetermined control and protection when the device is normal are performed. Further, in the case of the operating region LB, predetermined control and protection are performed, and an alarm is output. In the case of the operating region LC, an alarm is output as the set value changing operating region so that the turbine generator is not damaged within the plurality of limited operation control means due to external conditions such as the operating state of the turbine generator. One limited operation control means is selected, and the protection setting value change control means changes the protection setting value to continue the operation. In the case of the operating region LD, the turbine generator protection stop control is performed as the operating limit region in order to protect the turbine generator.

[0021] With this, even when the power demand is not tense, that is, even when an abnormality occurs in the equipment, control is performed by the preset control logic, and when the equipment is greatly damaged, the water turbine generator is promptly operated by the protection device. Stop at.
Further, when the power demand is tense, that is, when the command value P1 ... Pn is large, and an abnormality occurs in the device according to the magnitude, the operating region LC calculated by the automatic calculation unit 8 According to the external conditions, the limited operation control means is selected from the plurality of limited operation control means according to a preset procedure, and the protection set value change control means changes the set value of the protection device. For example, when an abnormality occurs in which the bearing temperature of the water turbine generator is higher than a set value during the power generation operation and the operating range is LC, the opening degree and operation of the guide vanes are set as external conditions according to the bearing temperature of the turbine generator. Try to change the speed. In this case, in the case of the limited operation control means (1), the opening of the guide vane is set to be the largest and the operation speed is set to be slow. The opening is small, that is, the operation speed is set to be high in the throttle direction. As a result, one limiting operation control means is selected from the limiting operation control means (1) to (n) so as to suppress the increase in the bearing temperature of the hydro turbine generator, and the selected limitation is selected. The operation control means changes the opening of the guide vane and the operating speed. In this way, the most suitable control among a plurality of limited operation controls is selected according to the external conditions by a preset procedure, and the opening of the guide vane is gradually reduced to operate so that the turbine generator is not overloaded as much as possible. I do. Further, for example, the bearing temperature is recorded by a recorder or the like, and the trip set value of the protective device is changed according to the bearing temperature.

FIG. 4 shows the operating range according to time from the degree of damage to the equipment. When the power demand is not tense, the preset value is set within the operating range of the protective device when the equipment is normal, If the damage exceeds the set value, the turbine generator will stop immediately.

Further, when the power demand is tense, the setting change logic unit 10 calculates so as to change the set value within the set value change region corresponding to the operation region LC calculated in the automatic calculation unit 8. . For example, when the bearing temperature of the turbine generator rises during power generation operation, the operating range is LC
In this case, the setting change logic unit 10 changes the set value of the protection device within the set value change operation area. In this case,
When the bearing temperature of the turbine generator rises further and the operating limit area is reached where the turbine generator cannot operate,
The protection stop logic unit 5 operates and the turbine generator stops immediately. In the example shown in FIG. 4, the reason why the operating area with respect to the damage level decreases with the passage of time is that the apparatus gradually withstands damage to the equipment over time.

As described above, the predetermined control is performed when the power demand is not tense, and the predetermined protection is performed when an abnormality occurs in the equipment. Further, when the power demand level is tight, the automatic control protection device can self-determine the set values of the control logic and the protection device, and can perform the control and protection that do not damage the equipment most.

In the present embodiment, the hydroelectric power plant dedicated to the power generation operation is described, but the present invention is not limited to this, and the automatic control protection device of the present invention can be applied to the hydroelectric power plant in the same manner.

[0026]

As described above, according to the present invention, the turbine generator is controlled and protected in accordance with the equipment abnormality information and the operation command information, and therefore, the peak demand in the summer when the power demand is severe, Even if an abnormality occurs in the equipment, it is possible to continue the operation without stopping the turbine generator and without imposing a burden on the equipment. Further, it is possible to operate up to the limit of the equipment of the hydroelectric power station by the operation command information, and it is possible to contribute to the power supply of the power system.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an automatic control protection device for a water turbine generator showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a driving judgment table for the automatic calculation unit of FIG. 1 to judge a driving region.

FIG. 3 is an explanatory diagram showing control and protection processing according to an operating region.

FIG. 4 is an explanatory diagram showing damage to equipment and an operating area.

FIG. 5 is a configuration diagram of a control / protection system for a water turbine generator having a conventional condition monitoring device.

FIG. 6 is a block diagram of an automatic control protection device showing a conventional example.

[Explanation of symbols]

 A remote control device B automatic control protection device C status monitoring device D detector 3 detection signal 4 control logic part 5 protection stop logic part 6 alarm logic part 7 plant status output logic part 8 automatic calculation part 9 automatic limit control logic part 10 setting Change logic part 11 Command value selection condition part

Claims (1)

[Claims] 1. A turbine generator is controlled based on equipment abnormality information output from a status monitoring device and operation instruction information from a control station based on an operating state of a plant and an abnormal state of equipment, while protecting the turbine generator. In an automatic control and protection device for a water turbine generator, an operation area determining means for determining one of an operation area during normal operation of the equipment, an operation limit area, and a set value change operation area based on the operation command information and the equipment abnormality information; When the judgment by the area judgment means is in the normal operation range of the equipment, it controls and protects the water turbine generator in a predetermined normal time, while it is in the operation limit area, it stops and protects the water turbine generator. In the changed operation region, the limited operation control means is selected from among a plurality of limited operation control means preset based on the operating state of the water turbine generator, and according to the preset procedure. While protecting the water turbine generator to change the set value of the protection device, automatic control and protection device of the water turbine generator is characterized in that a means to continue the operation.