JPS5920009A - Plant monitoring controller - Google Patents

Abstract

PURPOSE:To adjust easily and efficiently a digital controller, by transmitting the operation logic of the digital controller as data to a computer from the digital controller and discriminating the validity of this logic on the computer side. CONSTITUTION:Digital controllers 100-110 which receive the transfer request from a computer 30 transmit contents of their own logic parts from transmitting devices 102-112. When receiving contents of logic parts and check sum data, the computer 30 stores them in a pertinent memory and checks received data to discriminate the validity of data. If this checked data has abnormality, the computer 30 transmits the transfer request of logic again. If data is normal, the computer permits and confirms the restoration of controllers to on-line. The operator uses a keyboard 33 to permit it. The control of controllers is transferred to intrinsic processing logics; and when check of the display request is requested, data is preserved in a memory and is transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a digital control device for automatically operating a power generation plant and a computer-based plant monitoring and control device.

Technical background of the invention and its problems Generally, the monitoring and control of a power generation plant is performed using a control computer as the core. FIG. 1 is a system configuration diagram showing the configuration of a supervisory control system in such a power generation plant. As is well known, a power generation plant is structured as follows. In other words, the steam generated in boiler 1 is transferred to turbine 3.
and rotate Coupin 3. This causes the generator 4 to rotate, and the field of the exciter 5 generates electric power.

The generated power is sent to the power grid via the circuit breaker 6. On the other hand, the steam that has completed its work in the turbine 3 is returned to water in a condenser 3', and is sent to the boiler 1 again by a water pump 2.

Such power plants are provided with various control devices for individually controlling specific processes. A fuel flow control device 11 for controlling the flow rate of fuel to be combusted in the boiler 1, a burner control bag N12 for controlling ignition/extinguishing of the burner, a boiler water supply control device 13 for fully controlling the water flow # to the boiler 1. , a turbine speed control device 14 for controlling the rotation speed of the turbine, a load control device 15 for controlling the steam flow flowing into the turbine 1 according to the load of the power system, and a field control device for the generator 4. These include an excitation control rack w16 for controlling, a synchronous parallel control device 17 for connecting the generator 4 to the power system, and the like.

These control devices all receive commands for remote operation from the central control room via the auxiliary relay board 40,
This allows for centralized monitoring from a central location. By operating the switches and buttons 20 of the control panel 10 installed in the central control room, the operator can directly give operation signals to each of these control devices 11 to 17, and can also send operation signals to the monitoring and control computer 30. It is also possible to send signals from an automation console 32 provided on a control panel to the computer 30 and pass operation signals from the computer 30 to each of the control devices 11 to 17 based on an automatic operation program. In the case of automatic operation using such a computer 30, the operator must control the control panel 100% of the equipment 21.
In addition, the entire color cathode ray tube display (referred to as CRT) 31, which is a peripheral device of the computer, is monitored.

In other words, control start, control stop, and control target values are given to each control device via the control panel 10 in the case of manual operation and via the computer 30 in the case of automatic operation, and specific plant equipment is targeted. It allows you to manipulate the state.

By the way, when monitoring and controlling a power generation plant, not only the calculation results of each control device 11 to 17 but also each control device 1
There are times when it is necessary to monitor the operating states (progress) of items 1 to 17. This is the case in a certain flil, where even though a control start command has been issued to a control device, the control device does not execute a predetermined calculation process. In this case, it is necessary to find out what is causing this situation.

However, in the past, each control device 11 to 17
Since most of these are controlled using analog electrical signals, it is difficult to monitor the content of control calculations from the outside under normal operating conditions. This is because in the analog control device ig, it is difficult to freely extract internal information as a signal. This is because the state of the arithmetic expression or condition cannot be output to the outside because it is an analog random electric signal. On the other hand, recently, digital control equipment using microprocessors has come to be used instead of analog control equipment.

However, this is simply a DigiMole implementation of the arithmetic processing that used to be done in the analog system.
The configuration is not such that the content of the calculation processing can be output to the outside.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a control rack for independently controlling specific processes of a power plant. , K consists of digital control devices, and part of the function for exchanging information between these digital control devices and the subtraction machine includes a function for determining the operation and conditions of each digital control device. An object of the present invention is to obtain a plant monitoring and control device that can easily and efficiently adjust a digital control device necessary for the operation of a power generation plant.

Summary of the Invention The present invention provides a digital control device that is fully equipped with arithmetic processing functions that independently operate auxiliary equipment such as pumps and motors in power generation equipment, and control process meters, as well as monitoring and controlling the operation of the entire plant. The present invention relates to a control system equipped with an information transmission processing means for mutually transmitting and receiving all information related to arithmetic processing between a control computer that performs automatic driving and a control computer that executes automatic driving. Each digital control device has an information transmission processing means for transmitting the contents of its own arithmetic processing and the conditions of the arithmetic processing to the computer. On the other hand, there is an information display means that converts the logic of the digital control device into a computer and displays it on a CRT display device, etc., and a control calculation means that omit the logic of the digital control device or ignore the conditions. A plant monitoring and control device characterized by providing means for changing constant numbers of calculations and calculations, and thereby controlling the operation of the plant without exchanging information between the digital control device and the computer. It is.

Embodiment of the Invention Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 2 to 5. First, in the present invention, various control devices for independently controlling specific processes are configured with digital control devices using microprocessors. A digital control device using this microprocessor generally has the following features.

(a) The content of the control calculation and its progress can be notified to the display unit by printing it on a printer or displaying it on a CRT as necessary.

(b) Similarly, the content of control calculations and their progress can be transmitted to an external computer or the like via a data transmission device.

(c) It is easy to transfer the contents of arithmetic processing as information outside the device.

(d) External noise of all control devices such as constants necessary for calculations (;
You can adjust the control by changing the memory contents using the memory contents change function.

Of course, these features (a) to (d) cannot be achieved by simply replacing the analog control device with a digital control device, so the means for achieving the features (a) to (d), That is, data transmission means, arithmetic processing logic determination means, information display means, etc. are provided. and,
The following functions are achieved through cooperation between the digital control device and the computer.

(a) The contents and progress of the calculations of the digital control device are output to a printer or CRT, and the data is transmitted to the meter, thereby notifying the operator via its peripheral devices.

(b) Centralized management of information from numerous digital control devices using computers.

(c) Constants such as control gains and limit values required for the operation of the digital control device are changed and adjusted using computer peripherals (CRT, keyboard, etc.) 6 Figure 2 shows the main FIG. 1 is a system configuration diagram of the invention. The control computer system includes a computer 30 and an information display unit 31 such as a CRT.
Input section 3 such as a keyboard for interacting with, driving, ha, etc.
3 and the digital control device groups 1.00 and 11.0, information from the digital control devices 100 to 110 on the computer 30 side is transmitted through transmission paths 51'' and 11-.
The control computer system is comprised of a receiving device 35 that receives signals from the computer 30, and a J''c4 indicator transmitter 34 that sends commands from the computer 30.
A digital control device that controls each single function combined with
(η(100-110)). Each of the digital control devices (100-110) is connected to transmitting devices 102-112 and Ft3T[3
Receiving devices 103 to 113 that receive commands from 0 and process input/output control racks fi (io1 to 11) that output input and control signals from the plant for control.
1) It has '.

On the other hand, each digital control device (100 to 110)
It has an arithmetic processing unit that makes various disputes and logical decisions to be processed internally. The functions performed between the computer 30 and each digital control device (100 to 110) are achieved by the following means. FIG. 3 shows processing blocks within the digital control device, which are data transmission means. FIG. 4 is a block diagram showing the processing of the computer 30 at the time of starting up the digital control device, which is an arithmetic processing logic determining means. Further, FIG. 5 is a block diagram showing the processing of the divider 30 for displaying the status of the processing content of the digital control device, and this is an information display means.

In the system configuration diagram shown in FIG. 2, consider a case where, for example, maintenance and remodeling of the digital control device @100 involves changing the internal sequence logic and all other processes. In this case, stop the digital control device and put it into the online I complement state (system).
Exclude from and make changes.

Generally, from a reliability perspective, arithmetic processing logic is stored in read-only memory ROM (Reab 0nty Memory ROM).
) is used, so ROM is a tool for storing memory f%.
Changes are made using a device called a writer. After confirming the change, all the digital control devices are started up in order to return them to the online system. In FIG. 3, the processing logic of the digital control device after startup is shown in FIG.
First, initialization processing 1000 Th is performed for the control device itself, and a system startup request 1001 'fK is sent to the computer 30.
:put on. On the other hand, each device 30 receives a system startup request in FIG. 4, and the startup processing program of the corresponding digital control device is driven.
00) After confirming "k," a request is made to transfer the logic of the digital control device (2001).The digital control device that received the transfer request confirms that all logic transfer requests have been received (1002) in Fig. 3. After that, it transmits the contents of its own logic section and checksum data to the control computer (1003).The computer 30 that has received the contents of its logic section and checksum data transmits the contents of its own logic section and the checksum data to the digital control computer at 2002 in FIG. The device logic checks the parity and checksum of the data stored in the corresponding memory of the calculator 30 and transmitted to check the validity of the data (2003).If there is an abnormality, the logic is checked again. If the data is normal, the operator is asked to confirm permission to return the digital control device to online.The operator uses, for example, the CRT keyboard 32 in FIG. Permission is granted.The digital control device 30 receives the result and confirms that the system startup is OK in Fig. 3 (1004) L. The digital control device shifts to its own original processing logic and enters the online operating state. Return to 10
The various arithmetic processing logics in 05 perform a series of sequence operations for necessary functions, and a necessary part of the logic includes logic (1006) that checks whether there is a data display request from the computer 30. If necessary, save all required human power information in the designated memory. Finally, it is confirmed that there is a display request (1008). If there is an L request, a series of set information is transmitted to the control computer.

There are cases in which the digital control device is unable to process the relevant function due to a problem with the conditions, etc. In such cases, although it is possible to issue a warning to the outside as a traffic jam warning, it is not possible to issue a warning under specific conditions. It is unclear whether this is a problem and cannot be processed.

It is absolutely necessary to know the specific failure conditions, but displaying these specifically goes beyond the scope of a single-function digital control device, and it is necessary to increase memory to process them. This adds new extra processing, which limits reliability and performance. In order to overcome all of these drawbacks, as mentioned above, all additional processing is performed within the limits that do not deviate from the scope of the digital control device, and the processing is performed at the cost of interface with the control computer.

As described above, the processing contents of the digital control device are summarized as follows.
0 memory, a display request can be made from the CRT keyboard 32 in FIG. 2 to monitor the status of the digital control device that is issuing the traffic jam warning. In response to the display request, the status display processing program shown in FIG. 5 is driven. Since the logic section data of the digital control device is already stored in the memory of the generator 30 in the processing blocks shown in FIGS. Display with (300
0. ). At the same time, all requests for transmission of input information are sent to the digital control device as a display request (3001
), the digital control device performs the same arithmetic and judgment processing using the transmitted input information and the logic of the digital control device, and displays the results on the display unit 31 in FIG. (3002) The entire constant display is displayed at regular intervals until a display cancellation request is received from the operator.

Effects of the invention This makes it possible to effectively utilize the display, monitoring, and calculation functions of the control computer system, and to concentrate on large rl+ functions without deviating from the original functions of a digital control device. can be managed.

[Brief explanation of drawings]

Figure 1 is a diagram of the conventional power generation plant control system configuration diagram, and Figure 2 is a diagram of the power plant control system configuration diagram of the present invention.
FIG. 3 is a processing block diagram of the digital control device, FIG. 4 is a startup processing block diagram of the digital control device, and FIG. 5 is a status display block diagram of the digital control device. ■...Boiler 2...Water pump 3...
Turbine 4... Generator 5... Exciter
6... Breaker 10... Control panel 11
... Fuel flow control device 12 ... Water supply control device 1
3... Burner control device 14... Turbine speed control device 15... Load control rack @16... Excitation control device 17.
...Synchronous parallel control device 20...Switches and buttons on the control panel 21...Instruments on the control panel 30...Control device 3
1... CRT display 32... Automation console 40... Auxiliary relay board 33... Input section 34 such as a keyboard 34... Instruction transmission section 35... Receiving device. 50.51...Transmission lines 100-110...Digital control device sections 101-1
11... Process input/output control devices 102 to 112...
・Transmitting device 103 to 113...Receiving device (7317
) Agent: Patent Attorney Noriyuki Chika (and 1 other person)
Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In the plant monitoring fll control device, which has a digital control device that independently controls a specific process of the power generation plant, and a computer that integrates this digital control bag Rk and monitors and controls the operation of the entire power generation plant, The digital control device is provided with a means for transmitting data of its own arithmetic processing logic to the computer, and the computer includes a determination means for determining the validity of the arithmetic processing logic of the digital control device, and a means for transmitting the determination result. and information display means for displaying the arithmetic processing logic.