JP2005346375A - Plant facility control system and method for controlling plant facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plant facility control system capable of continuing unmanned operation of plant facilities by automating the restoring operation of an auxiliary machine at the occurrence of jamming, and a method for controlling the system. <P>SOLUTION: The plant facility control system 2 is provided with a plurality of auxiliary machine control means 10 for determining the existence of abnormality occurrence in respective auxiliary machines 3 constituting power facilities 1 and controlling the operation of the auxiliary machines 3, each auxiliary machine control means 10 is provided with an auxiliary machine abnormality determination means 15 for receiving an operation command signal from an operation command means 6 for applying an operation command to the auxiliary machine 3, receiving a monitor information signal from an auxiliary monitoring means 7 for monitoring the operation state of the auxiliary machine 3 and determining the existence of abnormality occurrence in the auxiliary machine 3 on the basis of the received operation command signal and monitor information signal and an auxiliary machine restoration control means 16 for receiving an abnormality determination signal outputted when the auxiliary abnormality determination means 15 determines the abnormality of the auxiliary machine 3 and trying to restore the auxiliary machine 3 determined as abnormality. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a system for unmanned control of plant equipment and a method thereof, and more particularly to a plant equipment control system and a plant equipment control method for unattended restoration work when an auxiliary machine breaks down.

  Plant facilities (for example, power generation facilities) have many electric auxiliary machines such as pumps and valves (hereinafter referred to as auxiliary machines) that are operated by electric power or air. Conventionally, there is an auxiliary machine operation process in which a plurality of auxiliary machines are operated and operated in a predetermined order when a plant facility is started or stopped.

  In the auxiliary machine operation process, first, the operator of the power generation facility performs an operation command input step for giving an operation command to the auxiliary machine, and then the operation is completed to confirm that the operation has been completed for the auxiliary machine given the operation command. Perform confirmation steps. And when the auxiliary machine which gave the operation command operate | moves, an operation command input step and an operation completion confirmation step are performed about the next auxiliary machine. Then, the operation command input step and the operation completion confirmation step are sequentially repeated to operate all the auxiliary machines.

  However, there may be a case where the completion of the operation is not confirmed even though the operation command is issued for one auxiliary machine on the way. If the completion of the operation is not confirmed despite the operation command being issued, the next auxiliary device cannot be operated without leaving the auxiliary device that has not completed the operation. I can't.

  Accordingly, a series of auxiliary machine operation processes are interrupted, and the plant equipment itself cannot be started or stopped (hereinafter referred to as traffic jam). When such a traffic jam occurs, the driver eliminates the traffic jam by inspecting and repairing the auxiliary machine that caused the traffic jam. For this reason, an operator must always be stationed in the plant equipment.

  In the case of plant facilities that operate day and night, it is necessary to adopt a system of 4 shifts and 5 shifts. The system of 4 shifts and 5 shifts requires a large number of operators, leading to an increase in labor costs and, as a result, impairing the economics of the plant equipment.

  The present invention has been made in view of the above-described circumstances, and a plant equipment control system and a control method thereof that enable continuation of unmanned operation of plant equipment by automating the restoration operation of an auxiliary machine when a traffic jam occurs The purpose is to provide.

  In order to solve the above-described problem, a plant facility control system according to the present invention controls the operation of an auxiliary device by determining whether or not an abnormality has occurred in an auxiliary device constituting the plant facility, as described in claim 1. An auxiliary machine control means for receiving an operation command signal from an operation command means for giving an operation command to the auxiliary machine, and an auxiliary machine monitoring means for monitoring an operating state of the auxiliary machine. Receives a monitoring information signal, and auxiliary equipment abnormality determining means for determining presence or absence of abnormality of the auxiliary equipment based on the received operation command signal and monitoring information signal, and the auxiliary equipment abnormality determining means When an abnormality determination signal that is output when it is determined to be abnormal is received, an auxiliary device recovery control unit that attempts to recover the auxiliary device determined to be abnormal is provided.

  In order to solve the above-described problem, the plant equipment control system according to the present invention is as described in claim 2, wherein the auxiliary equipment abnormality determining means is configured to detect the monitoring information signal received from the auxiliary equipment monitoring means. A NOT operation unit that performs a negative logic operation and outputs a signal, an AND operation unit that calculates a logical product of the operation command signal received from the operation command means and the output signal of the NOT operation unit, and outputs the signal, and an input abnormality determination And a timer for outputting a signal after a predetermined time has elapsed.

  In order to solve the above-described problem, the plant equipment control system according to the present invention is as described in claim 3, wherein the auxiliary equipment abnormality determining means is configured such that when the auxiliary equipment is an electric valve, the auxiliary equipment is A position signal indicating the position of the valve element is received as a monitoring information signal from the monitoring means.

  Furthermore, in order to solve the above-described problems, the plant equipment control system according to the present invention is the abnormality determination signal output from the auxiliary equipment abnormality determining means, as described in claim 4. A recovery command generation unit that generates and outputs a trigger, and counts the number of times the trigger is generated, and triggers received from the recovery command generation unit when the counted number is equal to or less than a preset number A recovery command count unit that outputs to a recovery operation signal output unit; and a recovery operation signal output unit that generates and outputs a recovery operation signal when a trigger is received from the recovery command count unit.

  Furthermore, in order to solve the above-described problems, the plant equipment control system according to the present invention is such that, as described in claims 6 and 7, the restoration operation signal output unit is configured such that the auxiliary machine is an electric auxiliary machine. , While generating a recovery operation signal that repeats a short-time pulse a plurality of times at regular time intervals and outputting it, when the auxiliary machine is a motorized valve, the positive direction and the negative direction It is configured to generate and output a recovery operation signal that alternately repeats a plurality of times at a constant time interval.

  In order to solve the above-described problem, the plant facility control method according to the present invention determines whether or not an abnormality has occurred in the auxiliary equipment constituting the plant equipment and determines the operation of the auxiliary equipment as described in claim 8. An auxiliary machine control process for controlling, the auxiliary machine control process includes an operation command signal receiving step for receiving an operation command signal from the operation command means, and a monitoring information signal receiving step for receiving a monitoring information signal from the auxiliary machine monitoring means And an auxiliary machine abnormality determination step for determining whether or not the auxiliary machine has an abnormality based on the received operation command signal and monitoring information signal, and recovery of the auxiliary machine determined to be abnormal in the auxiliary machine abnormality determination step. And an auxiliary machine restoration control step to be attempted.

  According to the plant equipment control system according to the present invention, it is possible to eliminate the occurrence of traffic congestion due to abnormal operation of the auxiliary equipment of the plant equipment and to automatically start / stop the plant equipment. It is possible to reduce the number of operators required for starting / stopping the plant equipment without lowering. Therefore, the labor cost required for the operator can be saved, and the economics of power generation can be improved.

  Further, when the auxiliary machine abnormality determining means determines that the auxiliary machine is abnormal, the recovery operation signal output unit of the auxiliary machine recovery control means generates and outputs a recovery operation signal corresponding to the type of the auxiliary machine. Appropriate recovery operation can be performed unattended.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a schematic configuration diagram schematically illustrating the configuration of a power generation facility 1 including a power generation facility control system which is an embodiment of a plant facility control system according to the present invention.

  In the power generation facility 1, various auxiliary machines 3 such as an electric pump and an electric valve are provided in a water supply / condensation system, a cooling system, etc., and the power generation facility control system 2 as a plant facility control system according to the present invention is A system for controlling these auxiliary machines 3.

  In addition to the power generation equipment control system 2, the power generation equipment 1 further includes a plurality of sensors 5 for obtaining necessary state quantities, and operation command means for obtaining information on the sensors 5 and outputting operation command signals to the auxiliary machines 3. 6, a plurality of auxiliary machines 3, an auxiliary machine monitoring means 7 for monitoring each auxiliary machine 3, and an alarm means 8 for warning an abnormal state when an abnormality occurs in each auxiliary machine 3.

  The power generation equipment control system 2 provided in the power generation equipment 1 includes a plurality of auxiliary machine control means 10. The auxiliary machine control means 10 acquires the operation command (electric signal) output from the operation command output means 6 and the monitoring information (electric signal) of the auxiliary machine 3 to be controlled from the auxiliary machine monitoring means 7. . And the auxiliary machine monitoring means 7 judges the presence or absence of abnormality of an auxiliary machine based on the acquired two signals, and outputs an auxiliary machine restoration signal to the power supply device 11 in order to restore the auxiliary machine 3 when judged to be abnormal. .

  The auxiliary machine monitoring means 7 differs depending on what the auxiliary machine 3 to be monitored is. As an example, when the auxiliary machine 3 is an electric pump, for example, a pressure gauge becomes the auxiliary machine monitoring means 7. On the other hand, if the auxiliary machine 3 is an electric valve, the auxiliary machine monitoring means 7 is a valve body position detecting means for detecting the open / closed state (position) of a valve body such as a limit switch and outputting the detection result as a position signal.

  In the power generation equipment 1 configured as described above, in the auxiliary machine operating process for starting up the plurality of auxiliary machines 3, first, the auxiliary machine 3 to be initially started is operated. In order to operate the auxiliary machine 3, the operator checks the state quantity acquired from the sensor 5, and if there is no problem, inputs an operation command to the operation command output means 6 (for example, push button switch (PBS) is turned on) ) Then, the operation command output means 6 outputs an operation command signal (normal start signal).

  The normal activation signal output from the operation command output means 6 is subsequently input to the power supply device 11 of the auxiliary machine 3. The power supply device 11 has a control circuit (not shown in FIG. 1) that controls the output in accordance with the type of input signal, and supplies power to the auxiliary machine 3 when a normal activation signal is input for a certain period of time. It is in an ON state that is performed regularly. Therefore, the auxiliary machine 3 can constantly receive power from the power supply device 11 and can operate.

  When the auxiliary machine 3 operates by receiving power supply from the power supply device 11, the auxiliary machine monitoring means 7 acquires a state quantity indicating the operating state of the auxiliary machine 3. The auxiliary machine monitoring means 7 monitors the operation state of the auxiliary machine 3 by monitoring the acquired state quantity, and monitors the auxiliary machine 3 and outputs a monitoring information signal corresponding to the acquired state quantity. Then, the output monitoring information signal is input to the power generation control system 2. The monitoring information signal input to the power generation facility control system 2 is input to each of the auxiliary machine control means 10 provided in the power generation facility control system 2.

  FIG. 2 is a schematic configuration diagram schematically showing the configuration of the auxiliary machine control means 10 of the power generation equipment control system 2.

  The auxiliary machine control means 10 discriminates the operating state of the auxiliary machine 3 to be controlled, determines whether or not there is an abnormality, an auxiliary machine abnormal operation determination means 15, and an abnormality determination signal from the auxiliary machine abnormal operation determination means 15. When received, it includes auxiliary machine restoration control means 16 for outputting an auxiliary machine restoration signal to attempt to restore the auxiliary machine 3 determined to be abnormal.

  The auxiliary machine abnormality determination means 15 includes a NOT circuit 18 as a NOT operation unit that performs a negative logic operation, an AND circuit 19 as an AND operation unit that calculates a logical product, and a timer that outputs an input signal after a predetermined time has elapsed. 20. Further, the auxiliary machine restoration control means 16 receives the abnormality determination signal, generates a restoration command (trigger) and outputs it, and counts the number of times the restoration command is generated. A recovery command count unit 23 for outputting a recovery command (trigger) to the receiver, and a recovery operation signal output unit 24 for receiving a recovery command (trigger) from the recovery command count unit 23 and generating and outputting a recovery operation signal.

  The auxiliary machine control means 10 configured as described above performs an auxiliary machine control process for determining whether or not an abnormality has occurred in the auxiliary machine 3 and controlling the operation of the auxiliary machine 3. The auxiliary machine control process includes an operation command signal receiving step for receiving an operation command signal from the operation command means 6, a monitoring information signal receiving step for receiving a monitoring information signal from the auxiliary machine monitoring means 7, and the received operation command signal and An auxiliary machine abnormality determination step for determining whether or not the auxiliary machine has an abnormality based on a monitoring information signal, and an auxiliary machine restoration control step for trying to restore the auxiliary machine 3 determined to be abnormal in the auxiliary machine abnormality determination step. Prepare.

  In the auxiliary machine control process, first, the operation command signal output from the operation command output unit 6 and the monitoring information signal acquired by the auxiliary machine monitoring unit 7 monitoring the auxiliary machine 3 are input to the auxiliary machine abnormality determination unit 15. That is, first, an operation command signal reception step and a monitoring information signal reception step are performed.

  In the operation command signal receiving step, the AND circuit 19 of the auxiliary equipment abnormality determination means 15 receives the operation command signal. On the other hand, in the monitoring information signal receiving step, the AND circuit 19 receives the auxiliary machine abnormality determination means 15 via the NOT circuit 18.

  Next, the AND circuit 19 of the auxiliary machine abnormality determination means 15 performs an auxiliary machine abnormality determination step, and outputs an abnormality determination signal according to the state (0 or 1) of the input operation command signal and monitoring information signal. . In other words, whether the output of the AND circuit 19 is 0 or 1 makes an abnormality determination for the auxiliary machine 3 to be controlled.

  In the abnormality determination step of the auxiliary machine 3 of the auxiliary machine abnormality determining means 15, when the auxiliary machine 3 is in a normal state, that is, when the operation completion condition of the auxiliary machine 3 is satisfied, the operation command output means 6 outputs Since the auxiliary machine 3 is operating in accordance with the received operation command, the operation command signal and the monitoring information signal coincide with each other, and the AND circuit 19 receives different inputs such that one is 0 and the other is 1. Therefore, when the auxiliary machine 3 is in a normal state, the output of the AND circuit 19 is 0 and no abnormality determination signal is output.

  On the other hand, for example, when the auxiliary machine 3 is in a state where it does not start (an abnormal state) due to shaft engagement of the electric auxiliary machine, that is, the operation completion condition of the auxiliary machine 3 is satisfied. If not, the operation command signal does not match the monitoring information signal, and the same input is made to the AND circuit 19. Therefore, when the auxiliary machine 3 is in an abnormal state, the output of the AND circuit 19 is 1, and an abnormality determination signal is output.

  The abnormality determination signal output from the auxiliary machine abnormality determination unit 15 is input to the auxiliary machine restoration control unit 16. Then, the auxiliary machine restoration control means 16 performs an auxiliary machine restoration control step. In the auxiliary machine recovery control step, first, the recovery command generator 22 generates a trigger as a recovery command. The generated trigger is counted by the recovery command counting unit 23.

  The recovery command counting unit 23 counts the number of times that the recovery command generation unit 22 has generated a trigger as a recovery command (hereinafter referred to as generation number j, j is a natural number), and is set in advance (hereinafter referred to as the set number k). Where k is a natural number). When the generation number j is equal to or less than the set number k (j ≦ k), the input trigger is output to the recovery operation signal output unit 24.

  When receiving the trigger, the restoration operation signal output unit 24 first outputs a stop signal for stopping the power supply of the auxiliary machine 3 to the power supply device 11 and then outputs a restoration operation signal. When the power supply device 11 receives the stop signal, the power supply device 11 is in an OFF state in which the power supply to the auxiliary machine 3 is stopped. Then, in a state where the power supply device 11 is stopped, a recovery operation signal is subsequently input.

  FIG. 3 is an explanatory diagram illustrating an example of a signal waveform of the restoration signal. The recovery operation signal output unit 24 outputs a recovery signal corresponding to the type of the auxiliary machine 3 to be controlled. For example, when the auxiliary machine 3 is an electric auxiliary machine, the auxiliary machine (electric auxiliary machine) 3 is operated with the ON state set to a short time. If this is repeated a plurality of times at regular time intervals, a restoration operation signal as shown in FIG. Note that the short time during which the auxiliary machine (electric auxiliary machine) 3 operates is a period of time that the overcurrent protection means does not operate, and is set in consideration of not violating the starting restrictions specific to the motor.

  When the auxiliary machine 3 is an electric valve, the valve is often caught on the way by a stick of the valve body. For this reason, there is a circumstance in which the opening and closing of the valve is often restored several times at regular intervals. Therefore, as shown in FIG. 3B, a recovery operation signal that reverses the polarity, that is, plus (+) and minus (−) at a constant period is output.

  When the power supply device 11 receives the recovery operation signal, it transmits a predetermined recovery operation signal to the auxiliary machine 3 and attempts to recover the auxiliary machine 3. When the auxiliary machine 3 is restored, the operation command signal and the monitoring information signal coincide with each other, so that the AND circuit 19 of the auxiliary machine abnormality determination means 15 stops outputting the abnormality determination signal (the signal output becomes 0). ). When the output of the abnormality determination signal is stopped and the abnormality determination signal input to the recovery command generation unit 22 of the auxiliary machine recovery control means 16 becomes 0, the auxiliary machine recovery control step ends.

  On the other hand, if the auxiliary machine 3 is not restored despite the attempt to restore the auxiliary machine 3, the abnormal state will continue, so that an abnormality determination signal is output from the auxiliary machine abnormality determining means 15 again. Is done. And the auxiliary machine restoration control means 16 performs an auxiliary machine restoration control step.

  When the auxiliary machine restoration control means 16 repeats the auxiliary machine restoration control step and eventually the generation number j generated by the restoration command generation unit 22 exceeds the set number k (j> k), the restoration command counting unit 23 The input trigger is output to the alarm means 8 such as an alarm, for example, without being output to the recovery operation signal output unit 24. When the alarm unit 8 receives a trigger from the auxiliary machine control unit 10, the alarm unit 8 issues a warning such as generation of a warning sound or a warning display.

  The operation command output means 6 outputs an operation command signal when the operator inputs an operation command (PBS is turned ON) even when the state quantity input from the sensor 5 indicates an abnormal value. However, when the state quantity input from the sensor 5 indicates an abnormal value, the operation command signal may not be output in consideration of safety.

  Further, although the NOT operation unit and the AND operation unit of the auxiliary machine abnormality determination means 15 are described as the NOT circuit 18 and the AND circuit 19, respectively, they are not necessarily limited to the NOT circuit 18 and the AND circuit 19 (hardware). However, software having equivalent functions may be used.

  As described above, according to the power generation equipment control system 2, the auxiliary machine operation control means 10 for controlling the operation of the auxiliary machine 3 is provided. Therefore, when the operation of the auxiliary machine 3 is abnormal, the abnormal operation of the auxiliary machine 3 is determined. The auxiliary machine restoration control step can be executed, and the operation of the auxiliary machine 3 can be automatically attempted to be restored by executing the auxiliary machine restoration control step.

  Therefore, the operation recovery operation of the auxiliary machine 3 that has been performed by humans can be made unmanned without impairing the supply reliability of the power generation facility 1. Unmanning the operation recovery operation of the auxiliary machine 3 leads to a reduction in labor costs, and thus has an effect of reducing power generation costs.

  Further, since the auxiliary machine operation control means 10 acquires the operation command signal from the operation command output means 6 and the monitoring information signal from the auxiliary machine monitoring means 7, the operation completion condition of the auxiliary machine 3 is established. Whether or not there is an abnormal operation of the auxiliary machine 3 can be determined. Therefore, for example, even when the shaft of an electric auxiliary machine is generated or when the valve opening is not sufficient with a stick of a valve body, the presence or absence of abnormal operation of the auxiliary machine 3 is accurately determined. It can be easily and easily determined.

  Further, depending on what the auxiliary machine 3 is to be controlled, an auxiliary machine restoration operation signal output from the auxiliary machine restoration control means 16 of the auxiliary machine operation control means 10 is set in advance, and the auxiliary machine abnormality determination means 15 compensates for it. When it is determined that the machine 3 is abnormal, it is possible to output a preset auxiliary machine restoration signal, and therefore, it is possible to perform an appropriate restoration operation for each auxiliary machine 3 unattended.

  Furthermore, if the abnormality (congestion) of the auxiliary machine 3 is not resolved even if the auxiliary machine restoration control step is performed several times, the auxiliary machine restoration control step is not carried out exceeding the preset number of times. Since the trigger is output to the alarm unit 8, the alarm unit 8 can issue an alarm and warn the operator of the occurrence of an abnormality in the auxiliary machine 3.

  In the present invention, the controlled object is not limited to the power generation facility 1. For example, the present invention can be applied to a plant having an auxiliary machine 3 such as an electric pump or an electric valve such as a water and sewage plant.

The structure schematic of the power generation equipment which comprises the plant equipment control system concerning the present invention. The structure schematic which represented the structure roughly about the auxiliary machine control means of the plant equipment control system which concerns on this invention. Explanatory drawing explaining an example of the signal waveform of the restoration signal which the auxiliary machine control means of the plant equipment control system concerning this invention outputs.

Explanation of symbols

1 Power generation equipment 2 Power generation equipment control system (plant equipment control system)
3 Auxiliary machine 5 Sensor 6 Operation command means 7 Auxiliary equipment monitoring means 8 Alarm means 10 Auxiliary equipment control means 11 Power supply device 15 Auxiliary equipment abnormality determination means 16 Auxiliary equipment restoration control means 18 NOT circuit (NOT calculation section)
19 AND circuit (AND operation part)
20 Timer 22 Recovery Command Generation Unit 23 Recovery Command Count Unit 24 Recovery Operation Signal Output Unit

Claims (8)

Auxiliary equipment control means for controlling the operation of the auxiliary equipment by determining the presence or absence of abnormality of the auxiliary equipment constituting the plant equipment,
The auxiliary machine control means receives an operation command signal from an operation command means for giving an operation command to the auxiliary machine, and receives a monitoring information signal from an auxiliary machine monitoring means for monitoring the operating state of the auxiliary machine, and receives it. Auxiliary equipment abnormality determining means for determining presence or absence of abnormality of the auxiliary equipment based on the operation command signal and the monitoring information signal,
And an auxiliary machine recovery control unit that attempts to recover the auxiliary machine that is determined to be abnormal when receiving an abnormality determination signal that is output when the auxiliary machine abnormality determining unit determines that the auxiliary machine is abnormal. Plant equipment control system. The auxiliary equipment abnormality determining means performs a NOT logic operation on the monitoring information signal received from the auxiliary equipment monitoring means and outputs a signal;
An AND operation unit that calculates a logical product of the operation command signal received from the operation command means and the output signal of the NOT operation unit, and outputs a signal;
The plant equipment control system according to claim 1, further comprising a timer that outputs the input abnormality determination signal after a predetermined time has elapsed. The auxiliary machine abnormality determining means is configured to receive, as a monitoring information signal, a position signal indicating a position of a valve body from the auxiliary machine monitoring means when the auxiliary machine is an electric valve. Item 3. The plant equipment control system according to Item 2. The auxiliary machine recovery control means receives the abnormality determination signal output from the auxiliary machine abnormality determination means, generates a trigger, and outputs a recovery command generation unit;
A recovery command count unit that counts the number of times the trigger is generated, and outputs a trigger received from the recovery command generation unit to a recovery operation signal output unit when the counted number is equal to or less than a preset number of times;
The plant equipment control system according to claim 1, further comprising a recovery operation signal output unit that generates and outputs a recovery operation signal when a trigger is received from the recovery command count unit. The recovery command counting unit is configured to count the number of times the trigger is generated, and to output a trigger received from the recovery command generation unit to an alarm unit when the counted number exceeds a preset number The plant equipment control system according to claim 4, wherein: The restoration operation signal output unit is configured to generate and output a restoration operation signal that repeats a short-time pulse multiple times at regular time intervals when the auxiliary machine is an electric auxiliary machine. The plant equipment control system according to claim 4. The recovery operation signal output unit is configured to generate and output a recovery operation signal that repeats a positive direction and a negative direction alternately a plurality of times at regular time intervals when the auxiliary machine is a motor operated valve. The plant equipment control system according to claim 4 characterized by things. Auxiliary equipment control process for controlling the operation of the auxiliary equipment by determining the presence or absence of abnormality of the auxiliary equipment constituting the plant equipment,
The auxiliary machine control process includes an operation command signal receiving step for receiving an operation command signal from the operation command means, a monitoring information signal receiving step for receiving a monitoring information signal from the auxiliary machine monitoring means, and the received operation command signal and monitoring An auxiliary machine abnormality determination step for determining whether or not an abnormality of the auxiliary machine has occurred based on the information signal, and an auxiliary machine restoration control step for attempting to restore the auxiliary machine determined to be abnormal in the auxiliary machine machine abnormality determination step A method for controlling plant equipment.

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