JP4434515B2 - Hydroelectric power plant control equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control device for a hydroelectric power plant.
[0002]
[Prior art]
In the operation of hydroelectric power plants, it is necessary to operate necessary equipment and equipment according to the situation such as oil supply and air supply. Such equipment is called an auxiliary machine, whereas a turbine generator, circuit breaker, and main transformer are called main machines, and their responsibilities are very important.
[0003]
As for the types and control methods of these auxiliary machines, pages 31-35 of Electric Joint Research Vol. 27, No. 9, “Standard Hydropower Station Standard One-person Control Method” published on January 25, 1972 And is generally well known.
[0004]
FIG. 5 is a conventional example showing a compressed air generating device and a pressure oil device that always operate regardless of the operation / stop of the main engine among the above-mentioned auxiliary machines, and further control the physical quantity using a detection device. An outline of operation will be described.
[0005]
The compressed air generating device includes an air compressor 1 for generating compressed air, an air tank 2 for storing the generated compressed air, an air pressure detecting device 3 for detecting air pressure in the air tank 2, and an operation command to the air compressor 1 ( It is comprised by the auxiliary machine control apparatus 4 which performs a power supply.
[0006]
In addition, the pressure oil device is a pressure oil pump 5 for sending oil, a pressure oil tank 6 for ensuring oil pressure, and between the pressure oil pump 5 and the pressure oil tank 6 to prevent over pressurization of oil pressure. An unloader valve 7 for reducing power loss due to pump operation, a hydraulic pressure detection device 8 for detecting the hydraulic pressure in the pressure oil tank 6, an oil level detection device 12 for detecting the oil level in the pressure oil tank 6, and a device oil reservoir An oil collecting tank 9 and an auxiliary machine control device 10 for giving an operation command (power supply) to a pressure oil pump and an air supply valve. A pressure oil tank is provided between the air tank 2 and the pressure oil tank 6. An air supply valve 11 for supplying compressed air to 6 is provided.
[0007]
The physical quantity measured by the atmospheric pressure detection device 3 is compared with a value preset for starting the air compressor in the detection device, and if the condition is satisfied, a signal of the auxiliary device start command 3a is output. The main control relay 4x in the auxiliary machine control device 4 is operated by the signal of the auxiliary machine start command 3a input to the auxiliary machine control device 4, and the operation power supply 4a is supplied to the air compressor 1. The air compressor 1 is activated by the supply of the operation power supply 4a, and the compressed air is supplied to the air tank 2 until the specified air pressure is reached.
[0008]
Further, the physical quantity measured by the hydraulic pressure detection device 8 is compared with a preset value for starting the detection device internal pressure oil pump, and if the condition is satisfied, a signal of an auxiliary machine start command 8a is output. The main control relay 10 x in the auxiliary machine control device 10 is operated by the signal of the auxiliary machine start command 8 a input to the auxiliary machine control device 10, and the operation power supply 10 a is supplied to the pressure oil pump 5. The pressure oil pump 5 is activated by the supply of the operation power supply 10a, and oil is supplied to the pressure oil tank 6 until the specified oil pressure is reached.
[0009]
If the physical quantity measured by the oil pressure detection device 8 is compared with a value preset for opening the air supply valve in the detection device, and the condition is satisfied, the signal of the air supply valve opening command 8d is measured by the oil level detection device 12. If the determined physical quantity is compared with a value preset for opening the air supply valve in the detection device and the condition is satisfied, the signal of the air supply valve opening command 12a is output.
[0010]
Accessory control device to operate the main control relay 10y of the auxiliary control device 10 at both conditions met for the air supply valve is input opening command 8d and the air supply valve opening command 12a to 10, supply valve operation source 10b 11 is supplied. The supply valve 11 is opened by the supply of the operation power supply 10b, and the compressed air is replenished into the pressure oil tank 6 until the air pressure reaches a specified oil pressure or oil level. When the hydraulic pressure is in an unloading region, the hydraulic pressure is adjusted by the unloader valve 7 to control the hydraulic pressure in the pressure oil tank 6 to a specified value.
[0011]
The atmospheric pressure detection device 3 has a main engine start condition 3b that satisfies the condition when the air pressure exceeds a predetermined value, and the hydraulic pressure detection device 8 has a main apparatus start condition 8b that satisfies the condition when the oil pressure exceeds a predetermined value and a main machine that satisfies the condition when the oil pressure decreases. An emergency stop command 8c is provided, and these signals are input to the plant control device 13 to perform start-up lock and protection stop of the main machine to limit the operation of the main machine.
[0012]
[Problems to be solved by the invention]
The detection devices that measure physical quantities that have been adopted in the above-mentioned conventional methods are mainly mechanical detection devices that have contacts such as limit switches. However, these detection devices are used in the surrounding environment (oil mist, water droplets). , Dust, etc.), the maintenance cycle is shortened with age, manpower required for maintenance is reduced, and the reliability is also lowered.
[0013]
In recent years, the power plant that employs a detection device (hereinafter referred to as a sensor) that converts a physical quantity into an electrical quantity in accordance with the development of detection device technology, regardless of whether maintenance work for these detection devices is omitted, is questionable It has become mainstream.
[0014]
However, along with the widespread use of electrical sensors, sensor abnormalities and failures due to temperature, submersion, humidity, induction / surge, power supply, etc., which had not been considered in the past, have also occurred, which may lead to major accidents in operation. There was also.
[0015]
In the example of the compressed air generator described in the above-mentioned conventional technology, when a failure occurs in the atmospheric pressure sensor installed in the air tank or any abnormality occurs in the signal transmission route from the sensor, the atmospheric pressure is related to the normal value. The output signal from the sensor becomes “zero”, and it is erroneously determined that the pressure has dropped by a comparison circuit that compares the signal with a preset value, and a start command is sent to the air compressor to return the pressure to the specified value. Continue to put out.
[0016]
As a result, in the case of an unmanned power plant, the patrol officer will continue to operate the air compressor until he / she comes to the power plant and manually stops it, resulting in equipment damage. Moreover, since it is not easy to determine a sensor failure, it may not be found. In addition, before the main machine is started, the air pressure lowering element operates, so the start condition is not satisfied, and the operation becomes impossible.
[0017]
Also, in the case of a pressure oil device, if a failure occurs in the hydraulic sensor installed in the middle of the device or if any abnormality occurs in the signal transmission route from the sensor, the pressure from the sensor is The output signal becomes “zero”, and it is erroneously determined that the hydraulic pressure is lowered by a comparison circuit that compares the signal with a preset set value, and the main engine is suddenly stopped (# 86-2). The pressure oil device itself continues to issue a start command to the pressure oil pump to return the oil pressure to the specified value.
[0018]
As a result, in the case of an unmanned power plant, the oil pressure pump will continue to be operated until the patrolman comes to the power plant and manually stops it, resulting in equipment damage. Moreover, since it is not easy to determine a sensor failure, it may not be found. If this is before the main machine is started, the sudden stop protection device (# 86-2) is operated unnecessarily, so that the start condition is not satisfied and the operation is impossible.
[0019]
The present invention has been made to solve the above-mentioned problems, and even if a sensor failure or signal transmission route used for controlling the auxiliary machine has an abnormality, unnecessary operation of the auxiliary machine is eliminated. The purpose is to provide a control system for hydroelectric power plants that does not interfere with the operation of the main engine.
[0020]
[Means for Solving the Problems]
A control device for a hydropower plant according to [Claim 1] of the present invention is a control system for an auxiliary machine of a hydropower plant that controls equipment using compressed air and oil as operating power sources, and secures the operating power source. Air compressor and pressure oil device, auxiliary machine control device that controls the operation of the air compressor and pressure oil device, a detector that measures the physical quantity of the operating power source and converts it into an electrical quantity, and overall plant in to the monitoring, control and hydroelectric power plants control device for protecting the transmission signal and the transmission signal to the same time sequence of the process data and the transmission signal of the auxiliary machine itself from the plant control system from the detector the same time a learning function that determines the operating manuals predict future driving state and a driving characteristic of the auxiliary is a characteristic derived from the operating condition of the auxiliary stream, the value detected by the respective detection devices and According form was operated manually and is provided with means which incorporates an abnormality determining function of determining an abnormality of the detection device on the basis of the detection device abnormality determined as if said created operation manual, the auxiliary control unit Thus, the air compression device and the pressure oil device are controlled to operate.
[0021]
Then, the operation will be described. The data measured by the pressure sensor provided in the compressed air generator and the hydraulic pressure sensor and oil level sensor provided in the pressure oil device, and the operation mode on the main engine side given from the plant control device And an operation manual that predicts the future operating state of the auxiliary machine based on the process data such as the opening degree of the guide vane, the opening / closing of the inlet valve, the brake application, and the operating state of the auxiliary machine When it is determined that the sensor is abnormal, the auxiliary machine is started and stopped according to the operation manual, and the operation can be continued and safely stopped by the protection stop element lock of the main machine.
[0022]
The control device for a hydroelectric power plant according to [Claim 2] of the present invention, in [Claim 1], when the abnormality determination function determines that the detection device is abnormal, the control device is configured to control the air pressure and hydraulic pressure that are the starting conditions of the main engine. It was made to be established. Therefore, as an action, when it is determined that the sensor is abnormal, the start condition of the main engine is established by locking the protection stop element. Therefore, even if the sensor is abnormal, the auxiliary machine is operated by the operation manual, and the main machine can be operated.
[0023]
The control device for a hydroelectric power plant according to [Claim 3] of the present invention informs the operator of the abnormality of the detection device when the abnormality determination function determines that the detection device is abnormal in [Claim 1]. I made it. Therefore, as an operation, when it is determined that the sensor is abnormal, an alarm is output to the outside. Then, the operator is notified of the alarm.
[0024]
The control apparatus for a hydroelectric power plant according to [Claim 4] of the present invention records the alarm item and the content when the abnormality determination function determines that the detection apparatus is abnormal in [Claim 1]. did. Therefore, as an action, when an abnormality is detected, the item and contents are recorded in the auxiliary device. Therefore, the operator can confirm the history.
[0025]
Hydroelectric power plants control apparatus according to the claim 5 of the present invention, in any one of the [Claim 1] [Claim 4], abnormality determining function of determining an abnormality of the detection device, the detection point On the other hand, the judgment is made based on the transmission signal from a plurality of detection devices installed and the operation manual . Therefore, as a function, a plurality of detection devices are installed at each detection point, and abnormality of the detection device is determined from the transmission signal and the operation manual .
[0026]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIG. 1 is a block diagram showing a first embodiment of a control apparatus for a hydropower station according to the present invention. In FIG. 1, the same functional parts as those in FIG. In the present embodiment, the atmospheric pressure detection device 3, the hydraulic pressure detection device 8, and the oil level detection device 12 are sensors that output a physical quantity to be controlled as an electrical signal, and an auxiliary device 14 installed in an auxiliary machine control panel (not shown). , Input to the auxiliary device 15.
[0027]
The plant side process data 13a, 13b output from the plant control device 13 and the transmission signals 3c, 8e, 12b from the sensors are always input to the auxiliary device. An operation manual is created based on these data.
[0028]
Sensor abnormality is determined by processing of the abnormality determination function, and auxiliary machine activation commands 3a and 8a and an air supply valve opening command 15a are output according to the operation manual. In addition, the main machine starting element and the protection stopping element are detected in the auxiliary machine control devices 4 and 10, and if necessary, the main machine starting conditions 3b and 8b and the main machine sudden stop command 8c are output to the plant control device.
[0029]
FIG. 2 is a block diagram of the auxiliary device 14 provided in the auxiliary machine control device 4. It has an interface for inputting process data 13a on the plant side and a transmission signal 3c from the atmospheric pressure detection device 3, and outputting a detection device abnormality alarm 14c, an auxiliary device start command 3a, or a main device start condition 3b.
[0030]
The learning function S2 of the auxiliary device 14 executes various calculations for creating an operation manual by using a built-in calculation program in consideration of the input data from the plant control device 13 and the operation status of the auxiliary machine, and stores the information as an arithmetic processing result storage unit. Transmit to S3.
[0031]
The arithmetic processing result storage unit S3 stores the operation manual created by the learning function S2, and determines the abnormality of the detection device by the abnormality determination function S5 for comparing and monitoring the data stored in the operation manual. When the detection device is abnormal, it is transmitted to the abnormality treatment control unit S4.
[0032]
When the abnormality treatment control unit S4 receives an abnormality signal from the data check unit S1 or the abnormality determination function S5 that makes an abnormality determination only with the transmission signal from the detection device, the storage stop of the arithmetic processing result storage unit S3 and the arithmetic processing result storage unit S3 Necessary signals are transmitted to the detection device abnormality alarm 14c, the auxiliary machine start command 3a, and the main machine start condition 3b according to the operation manual from.
[0033]
The abnormality determination function S5 compares the operation manual from the calculation processing result storage unit S3 with the data that is constantly input, and if the result deviates from the monitoring range, determines that there is an abnormality and transmits it to the abnormality treatment control unit S4.
[0034]
The comparison units S8 and S11 compare the predetermined set value with the normal signal from the data check unit S1, and if the condition is satisfied, take the normal signal from the abnormality determination function S5 and the logical product S9 to obtain the auxiliary machine start command 3a. Or as the main engine start condition 3b.
[0035]
Also, the operation signal from the abnormality treatment control unit S4 takes the logical sum S10 from the signal from S9 and outputs it as an auxiliary machine start command 3a or a main machine start condition 3b. Also, an abnormality signal is output from the abnormality treatment control unit S4 to the detection device abnormality alarm 14c.
[0036]
FIG. 3 is a block diagram of the auxiliary device 15 provided in the auxiliary machine control device 10. The process data 13b on the plant side and the transmission signals 8e and 12b from the oil pressure detection device 8 and the oil level detection device 12 are input, the detection device abnormality alarm 15d, the auxiliary device start command 8a, the main device start condition 8b, the main device sudden It has an interface for outputting a stop command 8c.
[0037]
The learning function S2 considers the input data and the operation status of the auxiliary machine, executes various calculations for creating an operation manual by a built-in calculation program, and transmits information to the calculation processing result storage unit S3. The arithmetic processing result storage unit S3 stores operation manuals individually created for the pressure oil pump and the air supply valve by the learning function S2, and compares and monitors the abnormality of the detection device with the data stored in the operation manual. Are determined in the abnormality determination functions S5 and S19, and are transmitted to the abnormality treatment control units S4 and S17 when the detection device is abnormal.
[0038]
When the abnormality treatment control units S4 and S17 receive an abnormality signal from the data check units S1 and S23 that determine an abnormality only by a transmission signal from the detection device or from the abnormality determination functions S5 and S19, the storage of the arithmetic processing result storage unit S3 is stopped. Then, necessary signals are transmitted to the detection device abnormality alarm 15d, the auxiliary machine start command 8a, the main machine start condition 8b, the main machine sudden stop command 8c, and the supply valve open command 15a by the operation manual from the arithmetic processing result storage unit S3.
[0039]
The abnormality determination functions S5 and S19 compare the operation manual from the calculation processing result storage unit S3 with the data currently input, and if the result deviates from the monitoring range, it is determined that there is an abnormality and the abnormality treatment control unit S4. Transmit to S17.
[0040]
The comparison units S8, S11, and S13 compare a predetermined set value with a normal signal from the data check unit S1, and if the condition is satisfied, take a logical product S9 from the normal signal from the abnormality determination function S5. The signal from the product S9, the signal from the abnormality treatment control unit S4, and the logical sum S10 are taken and output as an auxiliary machine start command 8a, a main machine start condition 8b, and a main machine quick stop command 8c.
[0041]
Comparing portion S1 5 compares the normal signals from the set value and data check portion S1 to a predetermined takes a normal signal ANDed S9 in the abnormality determining function S5 if conditions are satisfied, the comparison unit S24, advance The determined set value is compared with the normal signal from the data check unit S23, and if the condition is satisfied, the logical product is obtained from the normal signal from the abnormality determination function S19 and the signal from the logical product S9 via the comparison unit S15. S9 is taken and output as an air supply valve opening command 15a.
[0042]
Further, the operation signal from the abnormality treatment control unit S17 also takes the logical sum S10 with the signal from S9 and outputs it as the air supply valve opening command 15a. In addition, an abnormality signal is output from the abnormality treatment control unit S17 to the detection device abnormality alarm 15d.
[0043]
FIG. 4 shows the transmission data from the sensor, the process data from the plant control device, and the operation status of the auxiliary machine itself. The learning function stores the data as the operation characteristic of the auxiliary machine with respect to the operation mode of the main machine. This is an example in which a compressed air generator operating manual representing a state in which the auxiliary machine should be operated is created.
[0044]
The transmission signal 3c from the atmospheric pressure detection device 3, the process data 13a from the plant control device 13, and the operation status of the auxiliary machine are input, and the measured physical quantity of the transmission signal 3c is stored in time series on the Y1 axis which is the vertical axis. Then, the operation status of the auxiliary machine is stored in time series in the same manner as described above on the Y2 axis which is the vertical axis. Further, the process data 13a uses the operation mode that has been stopped and stopped from the start command of the main machine as the time-series time data to the X axis. These are graphed as the operating characteristics of the auxiliary equipment.
[0045]
From the graphed operating characteristics, the number and interval of operation of the auxiliary machine for the operation mode between A and B (for example, A: main engine start command, B: inlet valve opening command), the operation time per operation, and the maximum of the measured physical quantity Calculate the value and the minimum value, and make it an operation manual as data to be operated in the future. Similarly, the operation manual is set to the modes from B to C, from C to D, from D to E, and other (for example, when the main engine is stopped).
[0046]
According to the present embodiment, even when a sensor failure (including a transmission line abnormality) occurs, the auxiliary machine is operated according to the operation mode of the main engine from the operation manual created by the learning function. If it is before, it is possible to start, and if the main engine is operating, the operation can be continued without unnecessary stop.
[0047]
Further, since the auxiliary machine is also operated according to the operation manual, unnecessary continuous operation can be prevented and damage to the equipment can be prevented. Note that the operation manual is basically created only once during a test run or the like, but the operation manual may be updated through periodic inspections or device updates.
[0048]
【The invention's effect】
As described above, according to the present invention, when the auxiliary machine or the main machine cannot be started or stopped due to an abnormality or failure of the sensor body or its signal transmission path, an alarm can be generated and at the same time a learning function automatically. It is possible to control the operation of the main engine and auxiliary equipment from the start or stop safely. In addition, the maintenance staff can easily recognize whether a nonconformity has occurred and can take a countermeasure immediately.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a first embodiment of an auxiliary machine control device according to the present invention.
FIG. 2 is a block diagram of an auxiliary device according to the first embodiment.
FIG. 3 is a block diagram of an auxiliary device according to the first embodiment.
FIG. 4 is an example of creating an auxiliary machine operation manual by the learning function of the first embodiment.
FIG. 5 is a configuration diagram of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Air compressor 2 Air tank 3 Atmospheric pressure detection apparatus 4,10 Auxiliary equipment control apparatus 5 Pressure oil pump 6 Pressure oil tank 7 Unloader valve 8 Oil pressure detection apparatus 9 Oil collection tank 11 Supply valve 12 Oil level detection apparatus 13 Plant control apparatus 14, 15 Auxiliary equipment 3a, 8a Auxiliary machine start command 3b, 8b Main machine start condition 3c Air pressure transmission signal 4x, 10x Auxiliary power supply main control relay 4a, 10a Auxiliary machine start operation power supply 8c Main machine sudden stop command 8e Hydraulic transmission signal 10y Main control relay for supply air supply valve 10b Supply valve opening operation power supply
8d, 12a , 15a Supply valve opening command 12b Oil level transmission signal 13a, 13b Plant-side process data 14c, 15d detection device abnormality alarm S1 , S23 data check unit S2, learning function S3 arithmetic processing result storage unit S4, S17 abnormality treatment control Part S5, S19 Abnormality judgment function S8 Comparison part (auxiliary machine start command)
S9 logical product S10 logical sum S11 comparison unit (main machine start condition)
S13 Comparison unit (main engine sudden stop command)
S15, S24 comparison unit (supply valve open command )

Claims (5)

A control method of an auxiliary machine of a hydroelectric power plant that controls equipment using compressed air and oil as operating power sources, and an air compressing device and a pressure oil device for securing the operating power source, and the air compressing device and the pressure oil In each of the above-mentioned auxiliary machine control device that controls the operation of the device, a detection device that measures the physical quantity of the operating power source and converts it into an electric quantity, and a control device for a hydroelectric power plant that monitors, controls, and protects the entire plant. operation of the transmission signal and the transmission signal processing data of the same time series and said auxiliary said auxiliary which is the characteristic derived from the operating condition of the same time series as the transmission signal itself from the plant control system from the detector a learning function that determines the operating manual from the characteristics predicted future operating state of the accessory, the abnormality of the detection device the on the basis of said created operation manuals and detecting values from each detector A means which incorporates an abnormality determination function of the constant, the following when it is judged that the detecting device abnormality the created operating manual, the auxiliary control unit by the operation control the air compressor and the hydraulic oil system A control device for hydroelectric power plants. 2. The control apparatus for a hydroelectric power plant according to claim 1, wherein when the abnormality determination function determines that the detection device is abnormal, air pressure and hydraulic pressure, which are starting conditions for the main engine, are established according to the created operation manual. A control device for a hydroelectric power plant. In hydroelectric power plants control apparatus according to claim 1, wherein the abnormality determination when it is determined that the abnormality of the detection device in function, the detection abnormality hydroelectric power plants control, characterized in that to inform the operator of the apparatus apparatus. The control device for a hydroelectric power plant according to claim 1, wherein when the abnormality determination function determines that the detection device is abnormal, an alarm item and content indicating the abnormality are recorded. Control device. In hydroelectric power plants control device according to any one of claims 1 to 4, abnormality determining function of determining an abnormality of the detection device, a transmission signal from a plurality installed detection device for each detection point A control apparatus for a hydroelectric power plant, which is determined from the created operation manual .

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