CN104572023B - Logic computing method for the trigger-type of electric substation automation system - Google Patents

Abstract

The invention discloses a trigger-type logical calculation method for a substation automation system. The change signal generated in the system is collected by a change signal release unit, and the time stamp of the signal is attached to publish it to the message bus of the system; subscribe through the change signal The unit subscribes to the change signal from the message bus of the system, filters the signal according to the variables in the logic calculation formula, discards the unnecessary signal, and saves the required signal in the pending signal queue; Take out the signal in the logic calculation formula and search it in the logic calculation formula. If the variable in the logic calculation formula includes this signal, then carry out logic calculation on the logic calculation formula; the time scale of the calculation result adopts the time scale of this signal occurrence, and finally calculate The results are sent to the system's message bus. The invention adopts a trigger mechanism, can make full use of system resources when calculating large batches of data, and effectively improves system operating efficiency.

Description

Triggered logic calculation method for substation automation system

technical field

The invention belongs to the technical field of substation automation, and in particular relates to a trigger logic calculation method for a substation automation system.

Background technique

In the substation automation system, it is necessary to carry out logical calculations on the collected data, and the calculation results generate some new data to serve some advanced applications or meet certain requirements. Logic calculation (AND, OR, NOT, XOR, etc.), used to combine one or more signals into one signal according to the specified logic operation mode.

At present, the common practice in the substation automation system is to realize it by regularly scanning the real-time database. The logic calculation module accesses the real-time database to obtain the values of one or more signals involved in the calculation, and then calculates a new value from these values according to the specified calculation method.

This method of regularly scanning the real-time database cannot cope with rapidly changing signals. With the development of substation automation technology, the signal of some devices often only needs 20 to 30 milliseconds from action to reset. If the periodic scan period is set too low, the system load will be very high; if it is set relatively high, these rapidly changing signals may not be captured.

Some calculation results have relatively strict requirements on the time scale of signal occurrence. For example, when operating, it is required to use the time scale of the first arriving signal, and when returning, it is required to use the time scale of the last arriving signal. The method of regular scanning cannot capture these time scales.

Contents of the invention

In order to solve the deficiencies in the prior art, the present invention provides a trigger logic calculation method, the purpose of which is to process logic calculation efficiently and quickly, prevent the occurrence of signal loss, and keep the time scale of the calculation result consistent with the source time scale sex.

In order to achieve the above object, the present invention adopts the following technical scheme: a trigger-type logic calculation method for substation automation system, characterized in that, comprising steps:

1) The change signal is released, and the change signal generated in the system is collected through the change signal release unit, and the time stamp of the signal is attached, and then released to the message bus of the system;

2) Change signal subscription, subscribe change signal from the message bus of the system through the change signal subscription unit, after receiving the change signal, filter the signal according to the variables in the logic calculation formula, discard unnecessary signals, and save the required signals In the pending signal queue;

3) trigger logic calculation, take out the signal from the signal queue to be processed by the logic calculation unit, search in the logic calculation formula, if the variable in the logic calculation formula includes this signal, then carry out logic calculation to the logic calculation formula ; The time stamp of the calculation result adopts the time stamp of this signal, and finally sends the calculation result to the message bus of the system.

The aforementioned trigger-type logic calculation method for substation automation system is characterized in that: the change signal is a change remote signal, change telemetry, and SOE signal sent by the device.

The aforesaid trigger-type logic calculation method for substation automation system is characterized in that: said screening of signals according to the variables in the logic calculation formula is based on whether the signal participates in the logic calculation of the logic calculation formula, if the logic calculation If the formula contains this signal variable, it will be stored in the pending signal queue, otherwise the signal will be discarded.

The beneficial effects achieved by the present invention: the present invention triggers logic calculation by changing signals, improves the utilization rate of system resources, reduces system load, and effectively improves system operating efficiency; the calculation result uses the time scale of the source signal, which can satisfy the user's requirements for Strict requirements for the time scale of the calculation results; for fast-changing signals, since the changing signals are stored in the changing signal queue, the signal will not be lost; when the changing signal is taken from the changing signal queue, the changes are taken in the order of first-in-first-out signal, and only one change signal is processed and calculated at a time, so it will not cause confusion in the order of calculation results.

Description of drawings

Fig. 1 is a flow chart of a trigger logic calculation method for a substation automation system.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

Fig. 1 is a flow chart of a trigger logic calculation method for a substation automation system. The process of signal processing in substation automation system is divided into signal publisher and signal subscriber, and they are connected by message bus. The publisher collects the change signals in the substation automation system, and publishes these signals to the message bus of the system; the subscriber, after receiving the signals, screens and puts the signals that need to be processed into the signal queue to be processed; the logic calculation unit from After the signal is obtained in the queue, logic calculation is performed, and the calculation result is published to the message bus of the system.

The specific method is as follows:

The trigger logic calculation method used in the substation automation system, its implementation steps are as follows:

1) The change signal is released, and the change signal generated in the system is collected through the change signal release unit, and the time stamp of the signal is attached, and then released to the message bus of the system;

2) Change signal subscription, subscribe change signal from the message bus of the system through the change signal subscription unit, after receiving the change signal, filter the signal according to the variables in the logic calculation formula, discard unnecessary signals, and save the required signals In the pending signal queue;

3) trigger logic calculation, take out the signal from the signal queue to be processed by the logic calculation unit, search in the logic calculation formula, if the variable in the logic calculation formula includes this signal, then carry out logic calculation to the logic calculation formula ; The time stamp of the calculation result adopts the time stamp of this signal, and finally sends the calculation result to the message bus of the system.

The change signal is a change telesignal, a change telemetry, and an SOE signal sent by the device.

Said filtering the signal according to the variables in the logic calculation formula is based on whether the signal participates in the logic calculation of the logic calculation formula. If the logic calculation formula contains the signal variable, it is stored in the signal queue to be processed, otherwise the signal is discarded.

The following is an example to illustrate that there are n logical calculation formulas in the system, as follows:

OUT1=in11||in12||in13;

OUT2=in21&&in22&&in23;

OUT3=in31||in32||in33||in34||in35;

OUT4=! in41;

OUT5=in51&&in52&&in53&&in54;

OUTn=inn1||inn2||inn3||inn4

The above is the logic calculation formula in the substation automation system, where OUT1 is the calculation result of the three signals or operations of in11, in12 and in13, OUT2 is the calculation result of the three signals and operations of in21, in22 and in23, and OUT3 is the calculation result of in31, in32, In33, in34, in35 five signals or calculation results, OUT4 is the calculation result of in41 signal inversion, OUT5 is the calculation result of in51, in52, in53 and in54 four signals and operation, the rest of the logic calculation formula is based on analogy.

The logic calculation unit continuously queries the pending signal queue. If there is a change signal, it will be taken out of the queue for logical calculation. For example, assuming that all current input signals are 0:

Example 1

In11 signal changes from 0 to 1;

The publishing unit sends the signal to the subscribing unit;

The subscription unit searches and finds that the signal is involved in logic calculation, and puts the signal into the signal queue to be processed;

After the logic calculation unit gets the signal, it retrieves the logic formula that needs to be calculated. After searching, it finds that the formula OUT1 needs to be calculated. When the formula OUT1 is calculated, the value of OUT1 changes from 0 to 1.

Example 2

If the two signals In21 and in22 change from 0 to 1 successively;

The publishing unit sends these two signals to the subscribing unit;

The subscription unit searches and finds that these two signals are involved in logic calculations, and puts these two signals into the signal queue to be processed;

The logic calculation unit first gets the signal of in21, and retrieves the logic formula that needs to be calculated. After searching, it is found that the formula OUT2 needs to be calculated, and the value of OUT2 is still 0 when the formula OUT2 is calculated;

The logic calculation unit then gets the signal of in22 to retrieve the logic formula that needs to be calculated. After searching, it is found that the formula OUT2 needs to be calculated. When the formula OUT2 is calculated, the value of OUT2 is still 0.

Example 3

Following Example 2, the In23 signal changes from 0 to 1;

The publishing unit sends the signal to the subscribing unit;

The subscription unit searches and finds that the signal is involved in logic calculation, and puts the signal into the signal queue to be processed;

After receiving the signal, the logic calculation unit retrieves the logic formula that needs to be calculated. After searching, it is found that the formula OUT2 needs to be calculated, and the formula OUT2 is calculated, and the value of OUT2 changes from 0 to 1 at this time.

and so on.

Due to the use of this trigger mechanism, the logic calculation unit only needs to calculate the logic calculation formula of the change of the relevant variable, instead of calculating all the logic calculation formulas like the scanning method, and only processes and calculates one change signal at a time, so the result The time scale of the changing signal can be easily adopted to meet the requirements of the substation site for the timing of signal generation. For fast-changing signals, since the changing signals are stored in the changing signal queue, the signal will not be lost; when fetching the changing signals from the changing signal queue, the changing signals are fetched in the order of first-in-first-out, and each time only Process and calculate a change signal, so the sequence of calculation results will not be confused. When calculating a large amount of data, it is only necessary to calculate the logical calculation formula of the change of the relevant variables, so it can make full use of system resources and effectively improve the operating efficiency of the system.

The above is only a preferred embodiment of the present invention, and it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. It should also be regarded as the protection scope of the present invention.

Claims (3)

1. the logic computing method of the trigger-type for electric substation automation system, it is characterised in that including step：

1）Variable signal is issued, by the variable signal produced in variable signal release unit collection system, and encloses signal hair Raw markers, is published on the messaging bus of system；

2）Variable signal is subscribed to, and is subscribed to variable signal from the messaging bus of system by variable signal subscriber units, is received change Change signal after, the variable in logical calculated formula is screened to signal, discarding unwanted signal, it would be desirable to signal It is stored in pending signal queue；

3）The logical calculated of trigger-type, takes out signal, in logical calculated by logic computing unit from pending signal queue Searched, if the variable in logical calculated formula includes this signal, the logical calculated formula is patrolled in formula Collect and calculate；The markers of result of calculation uses the markers that this signal occurs, and result of calculation is finally sent to the messaging bus of system On.

2. the logic computing method of the trigger-type according to claim 1 for electric substation automation system, its feature exists In：The variable signal is the change remote signalling, change remote measurement, SOE signals sent on device.

3. the logic computing method of the trigger-type according to claim 1 for electric substation automation system, its feature exists In：Variable in the formula according to logical calculated is screened to signal, is that whether take part in logical calculated according to the signal The logical calculated of formula, is stored in pending signal queue if logical calculated formula includes this signal variable, otherwise loses Abandon this signal.