JPS6285104A - Automatic control device for power generating plant - Google Patents

Abstract

PURPOSE:To improve reliability in case of failures by providing a drive control module, which can be operated separately from a control system which is in one to one correspondence with an apparatus as the minimum constituent unit of a plant, in a system apparatus unit separating control system of a power generating plant. CONSTITUTION:A power generating plant 152 is composed of the plural number of systems 151 (151a-151n), and each system 151 includes the plural number of apparatus groups 150 (15a-15n) which is composed of the plural number of apparatuses 11 (11a-11n) to be controlled. And a DCM (drive control module) which is capable of backing up the input/output required to control a corresponding apparatus by a single piece of a printed circuit card, is provided to each apparatus 11 in the above said power generating plant in a manner of one to one correspondence for forming each of apparatus group controllers 156 (156a-156n) which corresponds to each of apparatus groups 150. And each DCM contains a manual back-up circuit so as to allow the other apparatus 11 to be automatically controlled as it is even if the DCM in discussion is out of order.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an automatic control device for a power generation plant, and relates to a drive control module (hereinafter referred to as DCM) that is optimal for the configuration of a system equipment unit distributed control system. .

[Background of the invention]

Conventional automatic control devices for power generation plants were composed of a combination of analog computing units, but improvements in plant load followability, increased complexity of control systems due to stricter exhaust gas regulations, and reduction in stress fatigue of the main engine led to longer lifespans. There is a need to introduce optimal control to prevent engine power consumption and to improve control accuracy through predictive control, while CR to improve machine performance is needed.
As systems such as T-displays have become more complex, analog control devices are no longer able to provide adequate support, so plant automatic control devices using digital controllers have become popular.

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 digital controller fails, multiple operating terminals may become uncontrollable, which is critical to the continuation of plant operation. This will cause serious trouble. Therefore,
Multiplexing of controllers is required, and manual back-amp circuitry using separate analog hardware is required.

FIG. 2 shows the configuration of a control device using a conventional digital controller. 1 is a digital controller; 2
CPU, 3 digital input card (hereinafter referred to as DI card), 4 digital output card (hereinafter referred to as DO card), 5 analog input card (hereinafter referred to as AI card), 6 analog output card (hereinafter referred to as AO card) , and process input output (hereinafter referred to as PI)
/O) bus 7.

Reference numeral 8 denotes a manual backup operation circuit provided outside the digital controller 1-, which manually adjusts the operating end in response to commands from the manual operation display and operation switch shown in 9 to operate the plant. This will enable continued operation of the system. /O is a plant and is composed of a plurality of 11 pieces of equipment.

Previously, one digital controller could handle multiple devices]
1 was controlled.

The number of input/output points from 3 to 6 is set with a focus on economic efficiency of the hardware, and therefore corresponds to the operation terminals of a plurality of devices. Furthermore, it is difficult to standardize the connection with a plurality of manual backup circuits 8, and an individual design is required for each operating terminal.

FIG. 3 shows front and side views of a conventional plant automatic control system using a digital controller.

/O0 is a system cabinet of the control device, and /O1 is a control power supply device.

1 is an input/output cable of the digital controller, and 8 is a manual backup operation circuit composed of analog hardware modules, relays, etc. This manual backup operation circuit has hardware equivalent to or more than the digital controller 1. /O3 is power wiring, /O4
is wiring for configuring a circuit in combination with an analog hardware module, /O5 is an external terminal block, and /O6 is an external cable connected to the plant.

In conventional systems, digital controller failure (
For example, when a DI, D○, AI, or AO card fails. ), when multiple operating terminals become uncontrollable, all of these multiple operating terminals must be manually controlled by a backup circuit, and this manual backup circuit has a scale equivalent to or larger than that of a digital controller. The drawback was that it required complex hardware and an extremely large number of wiring lines.

Incidentally, as a publicly known example of such a conventional system,
There is No. 5-133056.

[Purpose of the invention]

An object of the present invention is to install CM cards that can be controlled independently of each other in one-to-one correspondence with the equipment that constitutes a plant, so that failure of one DCM will not affect other equipment to be operated. Another object of the present invention is to provide a power generation plant control device that can be operated manually even in the event of CPU failure without providing a complicated backup circuit externally.

[Summary of the invention]

The present invention is a system equipment position distributed control system for a power generation plant, in which one DCM card is arranged in one-to-one correspondence for each equipment to be operated.

This DCM card includes a backup circuit that was conventionally external, and the number of DI points necessary to control one device.
By incorporating Do, AI, and AO, it is possible to configure a highly reliable control system that can independently control each 00M card without providing a complicated external backup circuit.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows an example of the configuration of a power plant control system according to the present invention. In the figure, 11a"n is a device to be operated, l50a"n is a device group consisting of a plurality of devices 11, 151a=n is a system consisting of a plurality of device groups 150, and 152 is a system consisting of a plurality of device groups 150. Multiple lineages 1
This is a power generation plant consisting of 51 units. 153a''n is a DCM that corresponds one-to-one to the plant equipment 11a to 11n, and can cover the input and output necessary for controlling the corresponding equipment with one print card.Each DCM can be used independently. Therefore, even if one DCM malfunctions, it will not affect other devices. Therefore, even if one DCM malfunctions (for example, a malfunction in the DI, Do, AI, or AO section), the malfunctioning DCM You only have to manually operate only the devices that support the DCM using the built-in backup circuit, and the other devices are automatically controlled.
The 0M card can be removed independently, so even if the number of other devices to be operated increases, a corresponding 00M card can be connected.

Therefore, maintenance can be performed independently for each 00M card.

154 is a CPU that supervises and controls a plurality of PCMs 153a-n, 155 is its PI/O bus, 156
a=n is the equipment group controller.

157 is a plurality of device group controllers 156a"
This is a system controller that regulates and controls n. 158 is the system controller 157, equipment group controller 15
This is an intra-system serial signal transmission line that connects 6a''n.

159a-n are system-based control systems, and 160
is a master controller that regulates and controls a plurality of system unit control systems 159a''n. 161 is a system serial transmission line that connects the master controller and the system controller.

FIG. 4 shows details of the DCM.

200 is a circuit executed by software stored in memory within the CPV.

201 is a hardware circuit realized by one DCM printed board.

202 has a PI/O bus, and the CPU and 00M card are interfaced via the PI/O bus of 202.

200 inner circuit is 203, 205, 206°208.2
It is written in the macro language shown in /O, 211, 215.

203 performs rationality diagnosis of the process state S quantity signal and outputs a logic signal 204 when an abnormality is determined.

A comparator 205 compares the output of the control target setter 206 with the process state quantity and outputs a deviation signal 207.

208 is a proportional-integral calculator which inputs the deviation signal of 207 and outputs an automatic control signal. 209 is a signal switch which selects the output of 208 in the automatic control mode, and selects the output of the analog memory for manual operation of 2/O in the 1 manual mode. Reference numeral 211 is an output signal diagnosis macro which outputs operation commands and actual position signals of the operation end 212. and the current feedback value 213 of the operation signal to diagnose abnormalities such as disconnection of the operation signal cable and malfunction of the operating end, and output a logical diagnostic code 214 when an abnormality is determined. Reference numeral 215 indicates automatic/manual switching logic for control and logic for displaying lamps, and macro outputs 204, 214 . and D
Input group 216 from I is taken in, automatic/manual mode 2
17 and a lamp display output group 218.

DCM consisting of one printed board circuit
Inside the card, there are 250 AI parts, 251 AO parts, 25
It also has a built-in DI section 2, a Do section 253, a manual backup circuit 254, a voltage/current converter 255, and an operating end lock circuit 256. A I, AO, D I,
Do(7) Each ffn*le(7) JU route is as shown in the figure, and the portions without the usage are reserved. Reference numeral 300 denotes an operator's operation section which includes a switch for manual operation, a lamp for displaying the status, a display for process status quantities, an operation command signal, and a control deviation. 301 is a position detector for the operating end 49, 302 is a limit switch that detects whether the operating end 49 is fully open or fully closed, 303 is an air source for driving the operating end, and the supply air is monitored by a pressure switch 304. .

Reference numeral 305 is a solenoid valve for locking the operating end, which locks the operating end when a control signal is abnormal or when the supply air source is lost.

FIG. 5 shows details of the manual backup circuit 254 in FIG. 4.

In the figure, 400 is an up/down counter, and when the load command 401 is input, the CP
Write data 404 from U is set.

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 A02 channel.

The other output of 406 is output from the AO3 channel and displayed on the opening indicator 300.

407 is a signal indicating a CPU stop state; 408
409 is a decrease command by a manual operation switch input from the D11 channel, and an increase command by a manual operation switch input from the DIO channel. 4/O, 411
is an AND gate.

The increase/decrease commands of 408 and 409 are valid only when the CPU is stopped. Further, 412 and 413 are flip-flops, 414 is a clock generation circuit, and 412
, 413 converts the increase/decrease command into a pulse signal synchronized with a clock.

415 is P A L (Prograllable L
It inputs the output of up-down counter 400 and the output of flip-flops 412 and 413, and manually controls the up-down counter in response to one input pulse from 412 and 413 within the range where the output value of 400 does not overflow. Increase/decrease command pulse 402.4
Outputs 03.

With this circuit, data from the CPU is output to the operating terminal as an operation output when the CPU is in normal operation, and when the CPU is stopped, the data immediately before the stop is held, and the up/down counter is increased/decreased by one manual increase/decrease switch operation. 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.

In addition, in Figure 4, the process state quantity required for manual operation is imported from the AIO channel in the DCM card without going through the CPU, and is output directly to the A○0 channel.
Display is ensured even in the event of a PU failure.

In FIG. 4, the operation output diagnostic signal 214 is sent from the CPU to P
The signal is input to the operating end lock circuit 256 via the I/O bus 202. 256 is an OR gate, which receives the signal 5 from the supply air source monitoring pressure switch input from DI7.
00, and when these abnormalities occur, a lock command is output from the DO 7 and the lock-up solenoid valve 305 is energized to prevent malfunction of the operating end. Since the lock circuit when the air source is lost does not go through the CPU, operation is ensured even when the CPU fails.

FIG. 6 shows a system cabinet implementation of a control device according to the invention. 600 is a system cabinet 601, a digital controller 5602 is a controller input/output cable, 605 is an external terminal block, and 606 is an external cable.

In this way, the input and output of the digital controller can be connected to processes outside the liquid without going through a backup circuit consisting of analog modules, relays, etc., making it possible to construct a very simple and highly reliable system. Become. In addition, as shown in the figure, the DCM card is a single printed circuit board that corresponds to each piece of process equipment, and maintenance such as replacement can be performed independently of other DCMs.
It becomes possible to construct a control device with extremely high autonomy.

〔Effect of the invention〕

According to the invention, each DCM card has one device and one device to be operated.
Since each DCM corresponds to one-to-one and is independent, failure of one DCM does not affect other devices, and maintenance can be performed independently.

In addition, the input/output function of each DCM card and the number of input/output points and CP
Since it has a built-in backup function in case of U failure, there is no need to provide a complicated external backup circuit, and the system is simplified, economical, and has the effect of improving reliability.

[Brief explanation of drawings]

FIG. 1 is an embodiment (system configuration) of the present invention, FIGS. 2 and 3 are explanations of the prior art, FIG. 3 is a cabinet mounting diagram of the conventional system, and FIG. 4 is an explanatory diagram of the DCM card of the present invention. FIG. 5 is a manual backup circuit in the DCM card, and FIG. 6 is an implementation diagram of the system 11 cabinet of the present invention. 1...Digital computer! -Roller, 8...Manual backup circuit, 11 =...Equipment, 153-DCM:D
rivecontrol Module, 156-...
Equipment Group Control Representative Patent Attorney Katsuma Ogawa
'The third word was called 'l', and the fifth figure, the sixth figure, and the heat of the summer.

Claims (1)

[Scope of Claims] 1. In a system equipment unit distributed control system of a power generation plant, a drive control module that corresponds one-to-one to equipment that is the minimum constituent unit of the plant and can be operated independently from the control system is arranged. A power generation plant automatic control device featuring: 2. An automatic control device for a power generation plant, characterized in that the drive control module according to claim 1 has a built-in number of input/output points necessary for controlling each device. 3. An automatic power generation plant control device characterized in that the drive control module according to claim 1 has a built-in backup circuit that can control the operating end even in the event of a CPV failure. 4. An automatic power generation plant characterized in that the drive control module according to claim 1 has a built-in operating end locking circuit that has a function of diagnosing an abnormality in the operating circuit and locking the operating end in the event of an abnormality. Control device. 5. A power generation plant characterized in that the drive control module according to claim 1 has a built-in circuit that inputs the state quantity of the process, transfers it to the PI/O bus, and directly outputs it to the hardware. Automatic control device. 6. An automatic power generation plant control device, characterized in that the backup circuit according to claim 3 is provided with an up/down counter whose operating end can be increased or decreased even in the event of a CPV failure.