JPH02183801A - Power plant controller - Google Patents

Abstract

PURPOSE:To prevent such a case where plural operation terminals are simultaneously disabled and to ensure the least necessary manual operations by setting a high function PI/O to each operation terminal serving as a least component element of a power plant and separating and connecting each PI/O from and to a control system independently of each other. CONSTITUTION:A back-up manual operation means 256 is contained in a high function PI/O 257. The PI/O 257 fetches the input process value to a CPU 2 via a PI/O bus 7 as long as the CPU 2 is normal. Then the PI/O 257 performs various arithmetic operations via the CPU 2 and outputs again an operation signal through an output circuit 4 via the bus 7. In the case the CPU 2 has a trouble, the operation terminal is manually controlled by the manual operation means 256 of the PI/O 257. Thus the necessary operation can be continued. As a result, the manual operations are carried out for each PI/O without using any hardware independent of a controller even in the case of CPU trouble.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a power generation plant control device, and includes construction of a super-distributed control system for each operating terminal, manual operation of each operating terminal,
The present invention relates to high-performance PI/O suitable for constructing a control system that allows maintenance.

[Conventional technology]

In the conventional system, P3 of Japanese Patent Application No. 55-133056
As described in Fig. 1, in order to eliminate the problem of not being able to control multiple operating terminals in the event of a digital controller failure, manual backup operations are implemented using hardware that is at least as large as the digital controller and an extremely large number of wirings. If the circuit is not configured, there is a drawback that it is impossible to configure a plant automatic control system, such as a power generation plant, which requires continued operation even in the event of a failure of the digital controller.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, a manual backup operation circuit is configured using hardware installed separately from the digital controller in order to eliminate the problem of being unable to control multiple operating terminals when the digital controller fails.
There is a problem in that this manual backup circuit becomes large in scale.

An object of the present invention is to provide a controller for control, a CRT, etc. without the need for a manual operation circuit using separately installed hardware.
To prevent a plurality of operation ends from becoming inoperable at the same time even when a stiffness controller for operation malfunctions, and to enable at least the minimum necessary manual operation.

[Means to solve the problem]

The above purpose is to provide a high-performance PI/O that is equipped with the number of process signal input/output points required to control each operation end, and the manual operation device, circuit, and status display required for manual operation.
This is achieved by constructing a control system by associating this high-performance PI/O with the operating end, which is the minimum control unit, in a one-to-one correspondence.

[Effect]

When the CPU is normal, the high-performance PI/O imports the input process amount to the CPU via the PI/O bus, and
Various calculations are executed at U, and the operation signal is again output from the output circuit via the PI/○ bus. In addition, in the event of a CPU failure, the input process amount is imported into the manual backup circuit built into the high-performance PI/O, and the high-performance PI/O
Highly functional PI/O as well as displayed on the status display on the /O
The operating end is operated according to the command signal from the manual switch. Therefore, even in the event of a CPU failure, manual operation is possible in high-performance PI/O units without installing hardware separate from the controller.

〔Example〕

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

Conventional power generation plant control devices were constructed from a combination of analog computing units, but control systems have become more complex due to improvements in plant load followability and stricter exhaust gas regulations.
There is also a need to introduce optimal control to reduce stress fatigue of the main engine and prevent its life from being consumed, and to improve control accuracy through predictive control.On the other hand, systems such as CRT display displays to improve machine performance are becoming more complex. plant automatic control equipment using digital controllers has become widespread as analog control equipment is no longer able to adequately respond to these demands.

However, for economical reasons, digital controllers are inevitably configured to process multiple operating terminals in a time-sharing manner with one controller, so if the CPU fails, multiple operating terminals may become uncontrollable, which is critical to continued plant operation. This will cause serious problems. Therefore, multiplexing of controllers is required, and a manual backup circuit using separate hardware is required.

Figures 2 and 4 show the configuration of a control device using a conventional digital controller. 1 is a digital controller, 2 is a CPU, 3 is a digital input card (hereinafter referred to as DI), and 4 is a digital output card (hereinafter referred to as Do). , 5 analog input cards (hereinafter referred to as AI), 6 analog output cards (hereinafter referred to as AO), and a PI/○ bus 7. Reference numeral 8 denotes a manual backup operating circuit which manually adjusts the operating end in response to commands from the manual operating display and operating switch shown in 9 to enable continued plant operation in the event of a failure of the digital controller. /O is a plant and is composed of a plurality of 11 pieces of equipment. Here, mainly for economic reasons, one digital controller 1 generally controls a plurality of devices 11.

FIG. 3 shows in more detail one device of the control device including the digital controller 1 to the roller shown in FIG. 2o is a circuit executed by software stored in the memory in the CPU 2 in FIG. These circuits are described in the macro language shown in 21, 24, 25, 27, 31, 33. Reference numeral 21 denotes an input signal diagnosis macro, which diagnoses the rationality of the signal 22 obtained by taking in the process state quantity using AI 5, and outputs a logic signal 23 when an abnormality is determined. A comparator 24 compares the output of the control target value setter 25 with the process state quantity and outputs a deviation signal 26. The bias signal 26 is input to a comparison integral regulator 27 and
It is output from the AO of and displayed on the deviation display 28 provided at 9. The proportional-integral controller No. 27 switches the control mode by the automatic/manual logic signal 29 input from the DI No. 3. In the automatic mode, it performs proportional-integral calculation according to the deviation signal 26, and in the manual mode, it performs the proportional-integral calculation from the AI No. 5. The command signal 30 input to the operating end is tracked. Reference numeral 31 is an output signal diagnosis macro which compares the output of 27 with the signal of 30, checks the rationality of sudden changes in the signal, etc., and outputs a logic signal 32 when an abnormality is determined.

Reference numeral 33 is a logical sum macro, which outputs via D○4 that the control of the device is in an abnormal state due to the diagnosis macros 21 and 31. A current/voltage converter 40 converts the current output of the process state quantity detector 41 into a voltage. 4
The output of 0 is input to the AI 5 and displayed on the display 42 provided at the AI 9. 43 is a signal switch, and the output of the manual interlock 44 automatically switches the AO6
The automatic operation output of the digital controller, which is the output of , is selected, while in manual operation, the output of the manual operation analog memory 45 is selected. The output of 43 is input to a voltage/current converter 46 and becomes a signal for operating the operating end of the device, while the output is input to AI 5 and displayed on a display 47 provided at 9. 48 is an electric/pneumatic converter which converts the output of 46 into pneumatic pressure and controls the operating end of 49. The mode of 45 analog memories can be switched by 44 manual interlock outputs. That is, when automatic, the output of the switch 43 is tracked, and when manual, the value is increased or decreased by the operating switch 50 provided at 9. The manual interlock of 44 is the automatic/manual changeover switch 5' provided at 9.
The automatic/manual mode of control of the operating end is determined based on the control abnormality signal outputted from DO1 and DO4.

Next, FIG. 4 will be explained. Automatic burner control device 16
is a plurality of controllers 1 that perform control, and C that performs calculations.
The PI/O is composed of PU2 and a high-performance PI/O3.4 that performs the conditional bathing, and connects the CPU2 and the high-performance PI/O3.4.
○Connected by bus 7. High-performance PI/O3 and 4 have input circuits.

Built-in output circuit and manual backup circuit.

An operating means 21 for manual backup operation is installed on the central operation panel 17 separately from the digital controller 1. The status signal of the 1/O device is a high-performance PI/O3
．． 4, is taken into the CPU 2 via the PI/○ bus 7, and is calculated there. The calculation result is sent to the high-performance PI/O 3.4 via the PI/O bus 7 to control the device 11.

The starting and stopping signals for Plan 1- are performed by the central operation panel 17. At the central operation panel 17, operations such as starting and stopping are performed on the operator console 13 while checking the status display displayed on the CRT 12. The operation signal is sent to each CPU 2 via the CRT operating stiffness controller 14 and the feed line 15.
sent to. In addition, the stiffness controller 14 for CRT operation
When the PU 2 is out of order, the device 11 is controlled via the backup operating means 21 and the high-performance PI/O 3.4.

FIG. 1 shows an example of a control system to which the present invention is applied.

In the present invention, the configuration of each device, each device, and the flow of signals are almost the same as the prior art shown in FIG. However, in order to satisfy the recent needs for downsizing the panel, saving labor for operators, and strengthening driving support functions, the CRT operation system 12 to 14 has been replaced with the manual means for the back amplifier as the operation means installed on the central operation panel 17. The backup manual operation means removed from the central operation panel 17 is
Built-in as 256 in high-performance PI/○257. In the control system described above, if the stiffness controller 14PU2 for CRT operation fails, operation can be continued by manually controlling the operating end by operating the manual operating means 256 mounted on the high-performance PI/O 257. secure.

By adding the manual operating means 256 to the highly functional PI/O 257 distributed in one-to-one correspondence with the operating terminals, it is possible to perform backup manual operation in the event of a CPU failure or an external manual operating means failure. A flexible and highly reliable control system can be realized without the need for an external backup circuit.

FIG. 5 shows details of the manual backup circuit 254 in FIG. 1. In the figure, 400 is an up/down counter, which is 4
When the load command 01 is input, write data 404 from the CPU is set via the PI/O bus 202. Further, when an increase command or a decrease command 402 or 403 is input, the output of the up/down counter 400 is increased or decreased according to the command. An output 405 of 400 is input to a D/A converter 406 and output as a voltage signal.

This output becomes a current signal for driving the operating end via the voltage/current converter 255 and is output from the AO.

The other output of 406 is output from AO. 4
07 is a signal indicating the CPU stop state, and 422 is an operation switch 256 mounted on the high-performance PI/O.
The reduction command 421 from the manual operation switch input from the operation switch 256 mounted on the high-performance PI/O
This is an increase command input from . 4/O, 411 is an AND gate, which makes the increase/decrease commands 408, 409 valid only when the CPU is stopped. Also, 412°4
13 is a flip-flop, 414 is a tarlock generation circuit, and 412 and 413 convert increase/decrease commands into pulse signals synchronized with a clock. 415 is PA
L (Programmable Logic Arra
y), and the up/down counter 4. Input the output of OO and the output of flip-flops 412 and 413,
412.4 within the range where the output value of 0 does not overflow.
In response to input pulses from 13, manual increase/decrease command pulses 402 and 403 for the up/down counter are output. With this circuit, when the CPU is operating normally, data from the CPU is output to the operating terminal as an operation output, and when CPIJ is stopped, the data immediately before the stop is held, and the up/down counter is increased/decreased by manually operating the increase/decrease switch. It is possible to manually increase or decrease the edge. Further, the operation signal at that time can be displayed regardless of the operating state of the CPU.

〔Effect of the invention〕

According to the present invention, in the power plant control device, the CPU
High-performance PI with built-in manual backup function in case of failure
By distributing O to each operating end, it is possible to independently control and maintain each operating end, and to construct a high-level acclimatization control system that enables continued plant operation by manual operation even in the event of a CPU failure. . still,
This control system is applied to power plants that use CRT operation instead of installing a manual backup operation circuit separate from the controller, with the aim of reducing panel space and strengthening operation support functions. The effect is particularly large.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a system diagram composed of conventional input/output devices, Fig. 3 is a diagram showing a control device showing detailed control for one device, and Fig. 4 The figure shows a control device using a conventional high-performance PI/O, and FIG. 5 is a detailed diagram of the control of the high-performance PI/O according to the present invention. 1...controller, 2...CPU, 3...
- Input circuit, 4... Output circuit, 7... PI/○ bus, 8... Manual circuit, 9... Operating means, 11... Equipment, 12... CRT display, 13... Operator Console, 14/Koshi controller 5 for CRT operation
. . . Transmission line, 254 . . . Manual circuit built into PIlo, 256 . . Operation means of the present invention, 257 . . High-performance PI/○ card. Figure 3 Figure 2 Figure 4

Claims (1)

[Claims] 1. A high-performance PI/O is arranged corresponding to the operating end, which is the minimum structural unit of a power generation plant, so that even if any high-performance PI/O fails, other high-performance PI/O What is claimed is: 1. A power generation plant control device that prevents failures from spreading to other systems, and that allows high-performance PI/Os to be individually disconnected from and connected to a control system so that maintenance can be performed individually. 2. In claim 1, the high-performance PI/O includes the number of process signal input/output points necessary to control each operating terminal and the minimum operating means necessary for manual operation;
Equipped with status display means and manual backup circuit, CP
A power generation plant control device characterized in that it is possible to manually control an operating end using a high-performance PI/O alone even during a U-stop.