JPS6231362B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coefficient setting method for a control computer system, and particularly to a coefficient setting method that allows coefficients to be changed in an online state.

Generally, when a computer is used for control, a series of control programs are stored in advance in a storage section, and the program instructions are sequentially fetched into the arithmetic section of the computer to execute required operations. This program contains parameters (coefficients) that can change the control characteristics of the system, but in order to change this once the program has been loaded onto the computer, you must modify a part of the program to create new coefficients. You need to insert the .
Therefore, in the conventional method, the coefficient settings cannot be changed without interrupting the computer control and stopping the progress of the program, so there is a limit to its application to applications where the control operation cannot be stopped even momentarily. It was hot. Setting values (coefficients) when changing the system configuration, especially for power system protection relay systems.
Unless the above-mentioned problems are solved, it will be difficult to maximize the effects of introducing a computer-based system in a device that requires changes in the system.

In addition, in a protection relay system using a computer, changing the setting (coefficient) is the only opportunity for a human to touch the computer relay, and the computer can be used effectively to prevent erroneous operations or setting errors due to misunderstandings on the part of the operator. If this is not removed, it will be difficult to maximize the effectiveness of the computer-based method as described above.

It is an object of the present invention to provide a coefficient setting method for a computer system that eliminates the above-mentioned drawbacks of the prior art, allows the coefficient settings of a control computer to be changed online without interrupting the control operation, and allows the changes to be made accurately and easily. We are here to provide you with a method.

In order to achieve the above object, the present invention provides an electrically erasable and rewritable non-volatile memory (EPROM) for setting coefficients and first and second buffer memories, and also provides a Sometimes control operations are performed by inputting coefficients from the EPROM to the computer via the first buffer memory, and when changing coefficients, the above
The coefficient transfer from the EPROM to the first buffer memory is prohibited, and the control operation continues with the previous coefficient setting value that is the content of the first buffer memory, and in this state, the changed coefficient setting value is transferred from the coefficient setting board to the above.
The changed coefficients are transferred to the EPROM and transferred to the second buffer memory, and during the idle time of the computer during the above control operation, the changed coefficients are read into the computer from the second buffer memory and the correctness of the range check etc. is confirmed. After confirming that there is no abnormality in the changed coefficients, the newly set coefficient values are taken into the computer via the first buffer and the control operation is started using the new coefficients.

Hereinafter, the details of the present invention will be explained with reference to embodiments focusing on the case of a protection relay.

FIG. 1 is a conceptual diagram of a coefficient setting panel for explaining an embodiment of the present invention, in which a display 1 that displays coefficient values, a coefficient setting switch 2 that sets coefficients, and the values of this coefficient setting switch 2 will be described later. Coefficient writing switch 3, coefficient selection switch (relay selection switch in the case of a protection relay) 4, (out of these, there are five element coefficient selection switches 41 to 45 in this figure, but it is necessary depending on the system. Coefficient change command switch 5, coefficient confirmation command switch 6 for checking these values after coefficient change, coefficient change indicator 7 for indicating that the coefficient is being changed, A normal setting indicator 8 is provided to indicate that the coefficient change value has been changed, and an abnormal setting indicator 9 is provided to indicate that the coefficient change value is abnormal.

FIG. 2 shows a block configuration of a typical embodiment of the present invention. Before giving a detailed explanation of the present invention, an outline of a protection relay that is normally operated by a computer will be explained using FIG. 2. That is, while periodically inputting the system information I sampled at regular time intervals via the input circuit 50,
Setting values stored in a non-volatile memory (EPROM) 20 that stores a plurality of electrically erasable and re-writable coefficient values (setting values of element relays in the case of protection relays) are input via the buffer memory 30, and the input information is Each time the information is acquired, the computer 60 performs calculations on this information according to the accident detection algorithm.
(The computer 60 includes an arithmetic logic unit 6.
1. There is a ROM 62 for program storage and a RAM 63 for data storage) The amount derived from the calculation result is compared with the input setting value above, and when it is determined that an accident has occurred, the 70
A shrunken command is issued through the output circuit of the This arithmetic processing is performed on the input data at the time of sampling every repetition.

Next, a detailed explanation of the present invention will be explained using FIGS. 1 to 3. However, FIG. 3 is an operational flowchart of the present invention.

First, at step 100 in FIG. 3, the coefficient change command switch 5 shown in FIG. 1 is turned on. As a result, the coefficient changing indicator 7 of FIG. 1 is turned on, and writing of the set value from the EPROM 20 to the data buffer memory 30 of FIG. 2 is stopped via the signal line A. However, the computer 60 continues to execute the protection relay task using the set value frozen in the buffer memory 30.

Next, in step 101, the corresponding selection switch of the element relay whose setting is to be changed among the relay selection switches 4 shown in FIG. 1 is turned on. This causes the coefficient display 1 in FIG. 1 to display the pre-change setting value of the relevant relay (the contents of the EPROM 20 in FIG. 2). In step 102, a setting value to be changed is set to the coefficient setting switch 2 shown in FIG. In step 103, the coefficient write switch 3 shown in FIG. 1 is turned on. As a result, the value of the coefficient setting switch 2 is written to the corresponding relay address of the EPROM 20 via the signal line B in FIG.
is notified to that effect via signal line C, and EPROM20
The setting value written in buffer memory 4 is automatically transferred to buffer memory 4.
At the same time, the contents of the EPROM 20 are displayed on the coefficient display 1 in FIG. From this point of view, enter this value and check this value, that is, check for deviation (for example, range check of the set value in the case of a protection relay).
Furthermore, this result is displayed on the displays 8 and 9 via the signal line D in Fig. 1 (if the check result is normal, the normal setting display 8 is lit, and if it is abnormal, the abnormal setting display 9 is lit). . The operator checks this result and the value on the coefficient display shown in FIG. 1, and if it is normal, moves on to the next coefficient change. If there is an abnormality, the process returns to step 102 in FIG. 3 and the same process as above is executed again.

The same process is repeated for the number of coefficient changes,
If it is determined in step 104 that all the planned coefficient changes have been completed, the process proceeds to step 105, where the coefficient confirmation switch 6 shown in FIG. 1 is turned on and this is notified to the computer 60 via the signal line C. . Since all the changed setting values (coefficients) should have been input into the buffer memory 40 in FIG. (In terms of protection relays, as shown in Figure 4, which shows an example of the characteristics of a distance relay, the relationship between the setting values, i.e., the setting value Z ₁ of the first stage < the setting value of the second stage) Value Z ₂ < Setting value of third stage Z ₃ ≦ Setting value of accident detection element
The relationship between the ZFD and the coefficient values of the timers associated with the characteristic example of FIG. 4 is checked by checking: first stage timer T ₁ <second stage timer T ₂ <third stage timer T ₃ ).

In step 106, the coefficient confirmation result is determined,
If it is normal, proceed to step 107 in FIG. 3, turn on the normal setting indicator 8 in FIG. 1, and proceed to step 1.
Proceeding to step 08, the coefficient confirmation switch 6 and coefficient change command switch 5 are turned off. When the coefficient change command switch 5 is turned off, the signal line A in FIG.
Since the writing to the buffer memory 30 that was locked by to go into. If the determination result at step 106 is abnormal, the process proceeds to step 109, where the abnormality setting indicator light 9 shown in FIG. 1 is turned on. In this case, the operator needs to return to step 101 and change the coefficients again from the beginning. However, at this time, it goes without saying that if a function is added to display which coefficient change was abnormal in step 106, only the abnormal coefficient setting value needs to be changed.

Figure 5 shows the compiler user operation in the above operation, and the task processing TK for each sample period.
This figure shows how the remaining time is used to check the set values (CK) and to check the relationship between the set values (CKK).

In this embodiment (Figures 1 and 2), only the main block configuration is shown and explained, but there are other configurations that allow for easy coefficient changes and prevent setting errors, and the required hardware configuration. It also takes into consideration the need to make the computer more compact and improve the processing power of the computer.

First, in order to make it easier to change the coefficients and to prevent setting errors, (a) the coefficient setting switches on the coefficient setting board are expressed in decimal notation (therefore, they are not shown in Figure 2). However, a decimal-to-binary conversion circuit is required before inputting the value of the coefficient setting switch to the computer.
When this circuit is not added, this process is
(needs to be done on the CPU).

(b) By turning on the relevant switch of the relay selection switch, the setting value that has been used up to now is displayed on the display, so that the value to be changed can be confirmed.

Furthermore, in order to reduce the amount of required hardware, (a) a coefficient setting switch is not provided for each element, but one switch is commonly used for each element.

(b) This requires a section to store the set values, but non-volatile memory is also required to enable automatic restart when power is restored from a power outage. Furthermore, since an electrically rewritable nonvolatile memory is required to cope with setting changes, a semiconductor nonvolatile memory EPROM is adopted in consideration of the above points.

Finally, regarding the improvement of computer processing power, (a) the computer does not access EPROM directly, but instead accesses it via buffer memory. This is because the access time of EPROM is large, so the computer
This solves the problem that when attempting to access the EPROM, it is limited by the access time of the EPROM and cannot utilize its maximum processing power.

(b) The range check of coefficients when changing coefficients, the check of relationships among coefficients, etc., which have been described so far, effectively utilize the idle time of the computer, as shown in FIG.

As is clear from the above description, the present invention has the following effects.

(1) Any set value can be changed at any time without interrupting computer operation.

(2) Since any number can be set as a coefficient, control characteristics can be easily changed and flexibility can be increased.

(3) In order to make it possible to check the deviation of the value for each coefficient change (range check) and check the relationship between coefficients after all coefficient changes,
Accurate coefficient changes can be easily performed.

(4) Set values can be maintained even if the power is cut off.

(5) The current setting value can also be easily viewed.

(6) The present invention utilizes idle time of the computer and does not pose any problem to relay calculations, for example.

From the above, the present invention has great practical merits because it can maximize the effects of introducing a computer.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a coefficient setting board explaining the present invention, FIG. 2 is a block configuration diagram showing a typical embodiment of the present invention, FIG. 3 is a flowchart of a setting change procedure explaining the present invention, and FIG. FIG. 5 is a diagram showing an example of setting values of a distance relay to explain the present invention, and FIG. 5 is a time chart to explain the processing timing of the present invention. 10...Coefficient setting board, 20...Non-volatile memory, 30, 40...Buffer memory, 60...Computer.

Claims (1)

[Claims] 1. A coefficient setting method for a control computer system, which includes an electrically erasable and rewritable non-volatile memory for coefficient setting, a first buffer memory, and a second buffer memory, and when changing the coefficients. , inhibiting the transfer of coefficient values from the non-volatile memory to the first buffer memory to keep the control task in a continuous state with the coefficient values stored in the first buffer memory; Change the coefficient from the setting board to the non-volatile memory, transfer this value to the second buffer memory, and change the coefficient value transferred to the second buffer memory during the idle time of the continuing control task. A validity check is performed by the control computer, and on the condition that it is confirmed to be normal, the new coefficient value set in the non-volatile memory is transferred to the first buffer memory, and the above control is thereafter performed. 1. A method for setting coefficients for a computer system, characterized in that said computer performs a control task in accordance with a new coefficient value set in said first buffer memory.