JPS598063A - n:1 backup method for distributed hierarchical system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an n:1 back-amplification method for a sub-loop controller in a distributed hierarchical system consisting of a host computer and a plurality of sub-loop controllers.

Conventionally, as a side leg device of a highly reliable stable for a large-scale control system, one itch and one turtle were reduced to 2 hours, and an alarm was displayed at the same time as switching to manual mode in case of a computer error. A method is known in which all computers are switched over.However, this method has the disadvantage that it is impossible to accurately diagnose abnormalities and that it does not save labor for the operator or operator.

In addition, the system can be distributed (the conventional n:l bank amplifier system, in which the sub-loop control section is provided with one bank up for multiple controllers in response to side diagonal symmetry), Calculator all two group controller glogram? Because it will last,
The problem was that the storage capacity of the top @Vn machine was large.

The purpose of the present invention is to provide a low-cost and highly reliable distributed hierarchical system by directly controlling the sub-loop controller from the upper-level computer in the event of an abnormality in the sub-loop controller, without increasing the storage capacity of the upper-level computer. ? It is on offer.

Does the host computer have two or more subloop controllers at the same time? In order to prevent bank up, we focused on the fact that the data table, which is the buffer area for control calculations of the subloop controller, can be shared by each subloop controller, and in the present invention, we have decided to have only one for each subloop controller, and the switching process for starting backup is It is always executed regardless of the back amplifier, preventing sudden changes in the signal when switching.

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

FIG. 1 shows an example of an application to which the present invention is applied to an APC (Automatic PC) that controls a once-through boiler in a thermal power plant.
1) shows the system of tant control. The solid-line rectangles in the figure are calculation elements that perform addition, subtraction, etc., and the areas surrounded by dashed-dotted lines each indicate the range of calculations performed by one microcontroller.

In the figure, 2 is a mask controller, and 3 is a subloop control [! -A, 4 is input processing controller, 5 is switching relay, 6 analog memo 1c, 7 electro-pneumatic converter, 8
is a solenoid valve, 9 is a transmitter, 10 is a control valve, 1
3 is a subtracter, 14-digit proportional integrator, 15 is an adder, 19 is a setter, 20 is a rate of change limiter, 21 is a control drive, and MWD is a central power supply command. Note that this diagram is simplified, and in the actual example, the number of calculation elements is 5.
From 00 pieces to 1000 pieces.

The APC system maintains the main steam pressure and the main steam pressure difference constant, and produces steam that matches the central power supply command MWD. The main turbine governor valve, water supply, etc. are fully controlled so as to occur.

That is, in response to the command value S issued by the central power supply command, the rate of change limiter 20 generates all signals that follow the command value within a predetermined rate of change, and issues commands for the main turbine and boiler input amounts. Output as value S. This boiler input amount command value S is corrected to keep the main steam pressure constant, and is set as the water supply command S3. Furthermore, the ratio of water supply loss and fuel amount is fully adjusted to keep the main steam hot water temperature constant, and a command value 84 for the fuel amount is created, and a command value Ss k for the air amount is created to keep the gas Oy'x constant. Create and output.

The mask controller 2 is the part that creates all the command values for the main turbine, water supply amount, fuel amount, and air amount. In accordance with these command values S, ~S, control valves such as the main turbine governor valve 10a1, water supply control valve 10b, and fuel valve 10C, and the amount of operation of the control drive 21, etc. that controls the amount of air? The subloop controller 3 is the part that controls the subloop. Also, main steam pressure, main steam temperature, gas O! The input processing controller 4 takes in the signals from the transmitter 9, performs temperature correction and pressure correction on these signals, and transmits all the corrected signals to the mask controller 2 and the like.

By the way, since each microcontroller can be configured by selecting and combining standardized computing elements, its software configuration can be configured by selecting and combining standardized computing elements, as shown in Figure 2. As shown in FIG. 2, the configuration includes a fixed processing program section 29 that executes standardized operations, the types of those operations, and operations W.
It is divided into a specification table @30 in which the order etc. are described. The fixed processing program section 29 is common to each controller, and only the specification table @30 is unique to each controller and represents the control content of each controller. Next, FIG. 3 shows an example of the hardware configuration of the abnormality detection and bank amplifier according to the present invention for a plurality of sub-loop controllers 3 installed. This is input processing controller 4
, mask controller 2, the loop controller 3,
and the second-rank computers I are connected to each other via a transmission basket.

Here, the upper ll calculator l is n subloop controllers) 0
- distribution of the control contents (i.e., the contents of the specification table 30 in Fig. 2) of the sub-loop controllers 5LC-i to 5LC-n; The electro-pneumatic converter 7 can be directly operated via six analog memories in place of any one unit.

The analog memo 6 can also be operated manually. Therefore, the operation mode of this sub-loop controller 3)"i
J: As is clear from FIG. 3, the selector station 11 switches to computer and manual control, and furthermore,
Even within computer control, it is possible to switch between the SLC side and the MOM side (that is, control by the host computer).

Next, the program configuration in the subloop controller and host computer will be described.

The entire program configuration for realizing the control block diagram shown in FIG. 4 is shown in FIG. That is, a calculation specification table is provided corresponding to the calculation elements in the control block diagram. This calculation specification table can be created by entering the type of each calculation element, all connection point numbers AO23゜8024 between each calculation element, etc., and by writing parameters such as gain of each calculation element in the C cheater table. This has been realized. The execution order of the calculation elements is realized by entering the starting address ft of the calculation specification table in the calculation order table.

The inputs of each performance element and the outputs that are the calculation results are written to the A data table and I) data table.

As a result of the above, the program configuration in the host computer is as shown in FIG. 6, including a fixed processing program section 29 that executes a standardized program, a switching program that detects and selects a failed SLC, and the same SLC for each of the 8 LCs. A specification table l'131 consisting of an operation specification table and an operation order table, A data, 1) data, C cheater table
It is composed of a data table section 32 consisting of a pull.

Since the above specification tables and data tables are the same for each SLC, the storage capacity n times that of each SLC is required. In this invention, the host computer can simultaneously use two or more 5L (1
Note that the data table is a buffer area that temporarily stores the calculation results, and if all SLCs are normal, the top N1
Is a calculator a control operation? By executing control calculations in place of the SLC only when one SLC fails,
Only one of the A data and D data tables of each SLC is prepared in its entirety, and is shared by each SLC to reduce the storage capacity. That is, since the A and D data tables account for approximately 25 out of the total of the specification table and data table, the effect increases as the number of 8LCs back-amplified increases. The above configuration is shown in FIG.

Data table for each SLC as shown above? If they are shared and arithmetic operations are executed only when a failure occurs, one problem will occur.

That is, since the value of the data table when the backup operation starts is unrelated to the contents of the data table of the 8LCs before the failure, a sudden change in the signal occurs when the host computer starts all the bank-up calculations.

FIG. 8 shows the SLC bank amplifier software control logic by the host computer. That is, analog memory A
Addition Re A, D33, proportional-integral calculator)'[F34 are used so that M37 matches the set value by the amount of the feedback signal. Here, θ account machine A I) 35 is analog memory A by hardware
In order to increase or decrease using the M6 ff pulse, the deviation from the current operation signal is taken.

In addition, the signal input to the proportional integrator PIF34 switches the proportional integrator PIF34 between automatic and manual mode; when it is 1, it is in automatic mode and proportional-integral calculations are performed, but when it is 0, it is in manual mode. , outputs the operation signal TB value as it is, and initializes the initial value of N integral,
Signals can be switched bumplessly without sudden signal changes. In other words, when SJ, C fails and backup by the host computer is started, the mode is changed from automatic to automatic standby (time) mode, and proportional integrator PIF3 is activated.
4 as the manual mode, and then switch to the automatic mode again when the initialization is completed in accordance with the current operation signal.

The time-limited operation element 'I' is to match these timings.
l) 38, and after a time delay from the start of SLC backup, its output becomes 1 and all automatic conditions are satisfied.

In addition, in the program configuration as shown in Fig. 7, the above calculations do not operate after the start of the SLC bank up, and the operation starts at the same time as the start of the bank up. It is also possible for element TP38 to immediately output one minute without any time delay.

To completely prevent this, as shown in FIG. 9, the time-limited operation element TP38 is stored in the common calculation specification table and the data table, so that it is always executed regardless of whether or not the bank up is started. The automatic standby mode is always activated and switching is performed without bumping.

According to the present invention, the capacity of a data table in a host computer can be significantly reduced, a highly economical backup system can be realized, and signals can be reliably initialized at the time of switching, resulting in a highly reliable system.

[Brief explanation of drawings]

The system configuration diagram of the 111id A I'C, @Figure 2 is the basic program configuration diagram, and Figure @3 is the distributed system 7.
- Figure 4 is a control block diagram, Figure 5 is a program configuration diagram for realizing each, Figure 6-1 is a conventional program configuration diagram, and Figure 7 is a program configuration according to the present invention. FIG. 8 is a diagram showing the internal control of the host computer, and FIG. 9 is a diagram showing the program configuration of the present invention. ■... Upper computer, 3... Double loop controller, 29... Fixed processing program, 31... Specification table, brown 1 figure broom 30 kaya 6 eyes kaya 7 eyes 1

Claims (1)

[Claims] 1. Operation @ n sub-loop controllers that control all directly, a mask controller that supplies command values to each of the sub-loop controllers so as to ensure mutual cooperation between the sub-loop controllers, and a mask controller for each of the sub-loop controllers. This is an n:l bank-up method of a distributed hierarchical system comprising upper-level computers that store specification tables and data tables fgQ among operating programs, and the upper-level total
The machine is characterized in that the data table, which is a buffer area for control calculations of each of the sub-loop controllers, is shared by each of the sub-loop controllers, and the data table for only one sub-loop controller is provided. Distributed positive system: 1 bank amplifier method.