JP2006352936A - Power generation plant control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To back up a failed CPU with other CPU when CPUs corresponding to a plurality of generators are performing unattended automatic operation of respective generators. <P>SOLUTION: The power generation plant control system comprises a plurality of prime movers 1 for driving respective generators 2, a CPU 12 storing the operation control program of the plurality of prime movers and generators and performing drive control of the prime movers and generators, a control link 13 for monitoring the operating state of other generators, an input unit 24 for receiving the open/close command of a circuit breaker, an output unit 25 for delivering the drive signal of prime mover and the open/close signal of circuit breaker, and gate means 21-23 provided, respectively, between the control unit and the I/O unit. Upon receiving a failure signal from some CPU, other CPU is linked with the I/O unit for the failed CPU through the gate means and executes operation control program of the prime mover and generator corresponding to the failed CPU. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power plant control system, and more particularly to a power plant control system that performs control for operation and power distribution of a plurality of power generators provided in a ship.

FIG. 3 is a block diagram showing a configuration of a conventional power plant control system.
A conventional power plant control system performs control for operation and distribution of, for example, three generators that generate power by being driven by, for example, an engine serving as a prime mover in a ship.
In FIG. 3, for example, three generators 2 that are driven by the engine 1 and generate electric power are provided on the ship. Each engine 1 is provided with a governor motor 1a.
When three generators 2 are provided in this way, three generator panels 3 are provided for each generator 2 as No. 1 to No. 3.
Each generator panel 3 drives and controls a touch-type operation panel 5 in which an operator performs a command operation for operating the generator, and an engine 1 that drives the generator 2 based on the command output from the operation panel 5. PLC 6 (programmable logic controller), ACB (air circuit breaker) circuit breaker 7 provided between generator 10 and bus 10 that distributes power to various devices in the ship, ACB open / close switch 8, and governor motor 1a The governor switch 9 is provided.

  The PLC 6 stores a power supply unit 11 that supplies a stable power to each unit, a CPU 12 that controls the operation of the generator 2 and the engine 1, and performs automatic operation control of the generator 2 and the engine 1, and other power generation units. To the control link 13 for exchanging with the operation state of the machine, the input unit 14 to which switch signals of the ACB open / close switch 8 and the governor switch 9 are input, the drive control signal to the engine 1 and the governor motor 1a, and the ACB open / close switch 8 And an output unit 15 for outputting the open / close signal. Reference numeral 17 denotes a control link line that connects the control links 13.

The conventional power plant control system is configured as described above, and is usually automatically operated to generate necessary power by the PLC 6 corresponding to each generator 2.
In this automatic operation, when the operation start switch of the operation panel 5 is operated, the engine 1 is driven and controlled in accordance with the operation control program of its own prime mover 1 and generator 2 in which the CPU 12 of the PLC 6 is built. Control to output the amount of power generation, make the frequency constant by power management by the CPU 12, synchronize with other generators (match the frequency), and balance the load balance with the power generation amount of other generators Or taking control of opening / closing of the ACB circuit breaker 7 and control of the governor motor 1a.
In this way, the automatic operation of the prime mover 1 and the generator 2 to which the individual PLC 6 of each generator panel 3 corresponds is performed.
(The above conventional power plant control system is a prior art, but there was no publication describing this prior art).

In the conventional power plant control system as described above, when the above-described automatic operation is performed and a plurality of generators 2 are linked, one PLC 6 has a failure of the power supply unit 11, a failure of the CPU 12, etc. When the failure occurs, the CPU 12 of the failed PLC 6 outputs a failure signal and turns on the abnormality display lamp, so that the failed PLC 6 can be identified.
Therefore, the operator manually operates the malfunctioning PLC 6 to control the operation of the engine 1 that drives the generator 2.
In the manual operation by the operator, the manual operation is started by pressing the operation start push button on the operation panel 5. Next, the ACB open / close switch 8 and the governor switch 9 are turned on, and the generator 2 is set in a driveable state.
After that, when driving control of the engine 1 that drives the generator 2 by manual operation is performed and the generator 2 starts generating power, a predetermined power generation amount is output and the frequency is made constant, It is necessary to perform power management such as synchronizing the load with the power generation amount of other generators and controlling the number of loads.
As described above, in the conventional power plant control system, when one PLC 6 fails, it is necessary to manually operate the failed PLC 6 to operate the generator. Therefore, there is a problem that an operator for an impulse operation must always be arranged and placed, and manual operation is troublesome, and the manual operation must be performed by a skilled person.
There is also a problem that a high-quality power source cannot be obtained because effective power management such as automatic operation does not work.

  A power plant control system according to the present invention includes a plurality of generators, a plurality of prime movers that respectively drive the plurality of generators, a busbar that performs power distribution, and a circuit breaker provided between each of the generators, An open / close switch for outputting an open / close command for the circuit breaker, an operation panel for performing various operation commands for each of the prime movers and generators, and an operation control program for the plurality of prime movers and generators are stored. A CPU that drives and controls the prime mover and the generator based on an operation command, and is linked to the CPU, receives operation information from the CPU, and communicates with the operation state of other generators via a control link line. A control link; an input unit that receives a switch signal of the open / close switch and sends the signal to the CPU; a drive signal from the CPU to the prime mover; In a power plant control system comprising an output unit that outputs an opening / closing signal to the control unit, a gate means is provided between each control link, each input unit, and each output unit, and each gate means is connected to a device network. Other CPUs that are connected and have received a failure signal from at least one CPU among the plurality of CPUCs, the gate means connected to the control link linked to the CPU has failed via the device net A prime mover and a generator connected to the gate means connected to the control link linked to the CPU, and the other CPU is linked to the failed input unit and the output unit linked to the failed CPU. The operation control program is executed.

As described above, the present invention stores a plurality of prime movers that respectively drive a plurality of generators, an operation panel that gives various operation commands to each prime mover and the generators, and a program for operation control of the plurality of prime movers and the generators. , A CPU for controlling driving of the prime mover and the generator based on an operation command from each of the operation panels, and a linkage with the CPU, receiving operation information from the CPU, and controlling exchanges with the operation states of other generators An input unit that sends an open / close switch command to open and close a circuit breaker provided between a control link that is connected via a link line, a power distribution bus, and each generator to the CPU, and a motor from the CPU Between each control link and each input unit and each output unit. Gate means are provided, each gate means is connected by a device net, and among the plurality of CPUCs, other CPUs having received a failure signal from at least one CPU are connected to a control link linked to the CPU. The device is connected to the gate means connected to the control link linked to the failed CPU via the device net, and the other CPU is linked to the input unit and the output unit linked to the failed CPU, and has failed. Since the operation control program for the prime mover and the generator corresponding to the CPU is executed, when at least one of the CPUCs fails, the control link of another normal CPU is connected to the failed CPU. Connected to the input / output unit via the device net, and other normal CPUs failed Receives an open / close switch command from the input unit and outputs a drive signal from the failed output unit to the prime mover and an open / close signal to the circuit breaker to execute the operation control program for the prime mover and generator corresponding to the failed CPU By doing so, it is possible to back up the failed CPU and continue unattended operation by automatic operation.
Therefore, it is not necessary to place an operator who is familiar with operation at all times in order to cope with a failure, and since unattended operation by automatic operation is continued, effective power management works and a good quality power supply is continuously obtained. It is done.

FIG. 1 is a block diagram showing a configuration of a power plant control system according to Embodiment 1 of the present invention, and FIG. 2 is a flowchart showing a power generation control operation when one PLC of the power plant control system fails.
In FIG. 1, in the same manner as in the conventional example, the first embodiment is also provided with, for example, three generators 2 that are driven by an engine 1 to which a governor motor 1a is attached to generate power. Three boards 3 are provided as No. 1 to No. 3.
Each generator panel 3 drives and controls a touch-type operation panel 5 in which an operator performs a command operation for operating the generator, and an engine 1 that drives the generator 2 based on the command output from the operation panel 5. An ACB circuit breaker 7, an ACB open / close switch 8 and a governor switch 9 of the governor motor 1a are provided between the PLC 6, the bus 10 that distributes power to various devices in the ship, and the generator 2.

Each PLC 6 stores a power supply unit 11 that supplies stable power to each unit, a CPU 12 that stores operation control programs for three generators 2 and engines 1, and performs automatic operation control of the generators 2 and engines 1. And a control link 13 for exchanging with the operating state of other generators. The control link 13 of each PLC 6 is connected by a control link line 17. Each CPU 12 stores an operation control program for three generators 2 and engines 1.
Further, a device gate 21 is connected to an input / output port of the control link 13 of each PLC 6, and the device gate 21 is connected to an output gate 23 via an input gate 22.
Each input gate 22 is connected to an input unit 14 to which switch signals of the ACB open / close switch 8 and the governor switch 9 are input. Each output gate 23 is connected to an output unit 15 that outputs a drive control signal to the engine 1 and the governor motor 1 a and an open / close signal to the ACB open / close switch 8.

The input gate 22 in the No. 1 generator panel 3 and the input gate 22 in the No. 2 generator panel 3 are connected by a device net 26, and the device gates 21 and 3 in the No. 2 generator panel 3 are connected. A device net 26 is connected to the input gate 22 in the generator panel 3.
Further, since the power supply unit 11, the CPU 12, and the control link 13 of each PLC 6 are configured as independent cassette styles as modules, module replacement is extremely easy and can be performed in a short time. In addition, since the input unit 14 and the output unit 15 are also configured as independent modules as modules, module replacement is extremely easy and can be performed in a short time.

Next, the power generation control operation when one PLC of the power plant control system according to Embodiment 1 of the present invention fails will be described based on the flowchart of FIG.
Operation control for normal power generation in the power plant control system is the same as in the conventional example, and the description thereof is omitted.
When the generator 2 corresponding to each generator panel 3 of the power plant control system is generating the necessary power by the automatic operation of the PLC 6 in the generator panel 3, the CPU 12 of each PLC 6 operates normally. (Step S1), the control link 13 exchanges the operating state of the other generators 2 with each other via the control link line 17, and the information is transmitted to the CPU 12 (Step S1).

Each CPU 12 monitors the operation state of the other generator 2 as well as the operation state of its own generator 2, and sees whether the operation of the other generator has become abnormal due to a failure of the CPU 12 or the like. (Step S2).
For example, when the CPU 12 of the PLC 6 of the No. 1 generator panel 3 fails, the failed CPU 12 outputs a failure signal and turns on the failure display lamp (step S3). Further, if the CPU 12 of the PLC 6 of the No. 1 generator panel 3 does not break down and is normal, the automatic operation is continued unattended as it is (step S4).
Of the CPU 2 in the No. 2 generator panel 3 and the No. 3 generator panel 3 that has received a failure signal from the CPU 12 in the No. 1 generator panel 3 via the controllable link line 17, for example, the CPU 12 in the No. 2 generator board 3. Performs backup of the CPU 12 in the No. 1 generator panel 3 (step S5).

As described above, the CPU 12 of the No. 2 generator panel 3 can back up the CPU 12 of the No. 1 generator board 3 because the CPU 12 of the No. 2 generator board 3 has an operation control of the generator of the No. 1 generator board 3. A program is stored, an input unit 24 to which switch signals of the ACB on / off switch 8 and governor switch 9 of the No. 1 generator panel 3 are inputted, a drive control signal to the engine 1 and governor motor 1a, and an ACB on / off switch 8 This is because the output unit 25 that outputs the open / close signal to the power source is connected to the input gate 22 and the output gate 23 of the No. 1 generator panel 3 via the input gate 22 and the output gate 23 via the device net 26.
Since the CPU 12 of the No. 2 generator panel 3 backs up the CPU 12 of the No. 1 generator board 3, the unmanned automatic operation of the generator 2 in the No. 1 generator board 3 can be continued (step S6).

The contents of the CPU 12 of the No. 2 generator panel 3 backing up the CPU 12 of the No. 1 generator board 3 and continuing the unattended automatic operation of the generator 2 include automatic frequency constant control, automatic synchronous input control, and automatic load sharing control. , Automatic load transfer control, number control of generators by load monitoring, automatic generator switching by bus voltage / frequency abnormality, etc. Among these, automatic frequency constant control, automatic load sharing control, and generator number control, which are power management, are included.
In this way, unattended automatic operation of the generator 2 in the No. 1 generator panel 3 is continued (step S7).

  In the first embodiment, for the generator 2 corresponding to each generator panel 3, when the CPU 12 of the PLC 6 in the generator panel 3 performs unattended automatic operation of the generator 2, for example, the first generator When the CPU 12 of the PLC 6 of the machine panel 3 fails, the failed CPU 12 outputs a failure signal, and the failure signal of the CPU 12 in the No. 2 generator board 3 and the No. 3 generator board 3 received the failure signal via the control link line 17. Among them, for example, the CPU 12 in the No. 2 generator panel 3 can back up the CPU 12 in the No. 1 generator board 3, so that an operator is always arranged for dealing with a failure as in the prior art. Because there is no problem that manual operation is troublesome and effective power management works, it is possible to obtain a good quality power supply It became.

In the first embodiment, when the CPU 12 of the PLC 6 in each generator panel 3 performs unattended automatic operation of the respective generators 2 for the generators 2 respectively corresponding to the three generator panels 3, When one of the CPUs 12 fails, the other CPU 12 performs backup. However, the generator 2 corresponding to each of the plurality of generator panels 3 also has other backups when one of the CPUs 12 fails. Of course, the CPU 12 can perform backup.
Of course, even if two CPUs 12 out of the three CPUs 12 fail, the remaining one CPU 12 can back up the failed CPU 12.
Furthermore, in Embodiment 1 described above, the generator provided in the ship is targeted, but it goes without saying that it can also be applied to a plurality of generators provided in other plants other than the ship.

The block diagram which shows the structure of the power plant control system which concerns on Embodiment 1 of this invention. The flowchart which shows electric power generation control operation | movement when one PLC of the same power plant control system fails. The block diagram which shows the structure of the conventional power plant control system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine (motor), 2 Generator, 3 Generator panel, 5 Operation panel, 6 PLC, 7 ACB circuit breaker, 8 ACB open / close switch, 9 Governor switch, 10 Busbar, 11 Power supply unit, 12 CPU, 13 Control link, 17 control link line, 21 device gate, 22 input gate, 23 output gate, 24 input unit, 25 output unit, 26 device net.

Claims (3)

Multiple generators,
A plurality of prime movers that respectively drive the plurality of generators;
A circuit breaker provided between the bus for power distribution and each of the generators;
An open / close switch for outputting an open / close command of the breaker;
An operation panel for giving various operation commands to the respective prime movers and generators;
A CPU for storing an operation control program for the plurality of prime movers and generators, and driving and controlling the prime movers and the generators based on operation commands from the operation panels;
A control link that is linked to the CPU, receives operating information from the CPU, and communicates with the operating state of other generators via a signal transmission line;
An input unit that receives the switch signal of the open / close switch and sends it to the CPU;
An output unit that outputs a drive signal from the CPU to the prime mover and an open / close signal to the circuit breaker;
In a power plant control system equipped with
A gate means is provided between each control link and each input unit and each output unit,
Each gate means is connected by a device net,
Among the plurality of CPUs, other CPUs that have received a failure signal from at least one CPU are connected to the CPU in which the gate means connected to the control link linked to the CPU has failed via the device net. Operation control of a prime mover and a generator corresponding to a failed CPU connected to an input unit and an output unit connected to a failed CPU connected to a gate means connected to a control link to be connected A power plant control system characterized in that a program is executed.   A governor motor is attached to each prime mover, a governor switch that gives a drive start command for the governor motor is connected to the input unit, and the CPU that receives a drive start command by the governor switch from the input unit receives a governor control signal from the governor motor. The power plant control system according to claim 1, wherein the governor motor is driven and controlled by outputting the power through an output unit. Each CPU, each control link, each input unit, and each output unit corresponding to each generator constitutes a programmable controller, and each member constituting the programmable controller is an independent cassette style as a module. The power plant control system according to claim 1 or 2, wherein the power plant control system is formed.

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