CN103559379A - Data source validity judging method and double-data-source selecting method - Google Patents

Abstract

The invention relates to a method for judging the validity of a data source and a method for selecting a double data source, and belongs to the technical field of data processing of intelligent substations. In the present invention, the health status of the dual data source device, the communication status of the data source and the validity of the data source are used as the credibility of the data source, and the data source with high reliability is selected as the main data source. Device failure, communication interruption, device maintenance can be switched to another data source, and when invalid data is sent from the main data source, it can also be switched to the data source with normal data in time, reducing the probability of sending invalid data and improving data quality. the accuracy rate.

Description

A method for judging the validity of data sources and a method for selecting double data sources

technical field

The invention relates to a method for judging the validity of a data source and a method for selecting a double data source, and belongs to the technical field of data processing of intelligent substations.

Background technique

For the stable and reliable operation of the power grid, the smart substation has dual configurations from the data acquisition device at the process level to the protection, measurement and control at the bay level, thus creating the concept of dual data sources. Dual data sources refer to having two independent data sources for the same measuring point. For example, in the case of dual measurement and control in the case of high-voltage level protection and integrated measurement and control devices, the remote control device communicates with two measurement and control devices at the same time, and accesses the data collected by the two measurement and control devices, then enters the unified control of the remote control device at the same time. There are two values of the measuring point, and in this case, the problem of data source selection arises.

The current data source selection plan is: select one of the devices as the data source when both devices are operating normally, and switch to the other device as a whole due to failure, communication interruption or maintenance of the device, and the selection plan does not consider the data sent by the device at all. whether the data is valid. The problem with such a data source selection method is: when the data sent from the process to the measurement device at the bay layer is invalid due to the failure of the data acquisition equipment at the process layer and the aging of the basic automation equipment such as the transmitter, the measurement at the bay layer is invalid. The device is still working normally and does not meet the data source switching conditions, so the invalid data is sent to the dispatcher. That is to say, when the two data source devices are healthy and the communication is normal, but the main data source is invalid due to other factors, at this time, according to the existing data source selection scheme, the system will send the main data source by default, so that As a result, the uploaded data is invalid, which may cause the dispatcher to make a misjudgment based on the received invalid data, affecting the normal operation of the system.

Contents of the invention

The purpose of the present invention is to provide a method for judging the validity of a data source and a method for selecting a double data source, so as to solve the problem that the validity of the data source is not considered when selecting the current double data source, resulting in the possibility that the selected data source is an invalid data source question.

In order to solve the above technical problems, the present invention provides a data source validity judgment method, the steps of the judgment method are as follows;

1) Judging the validity of the data being transmitted according to the validity bit identification of the quality factor in the 61850 message used by the data source;

2) If the data sent by a data source is continuously judged to be invalid for a set period of time, the data source is considered to be in an invalid state;

3) If the data sent by a data source changes from invalid to good data and lasts for a set time, the data source is considered to be back to a valid state.

When the bit flag of the validity of the quality factor in the 61850 message in the step 1) is invalid, the data is invalid.

The present invention also provides a kind of double data source selection method for solving above-mentioned technical problem, and the steps of this selection method are as follows:

A. Judging the validity of the data being transmitted according to the validity bit identification of the quality factor in the 61850 message adopted by the double data source;

B. If the data sent by a data source is continuously judged to be invalid for the set time, the data source is considered to be in an invalid state. If the data sent by a data source changes from invalid to good data and continues to be set After a certain time, the data source is considered to be restored to a valid state;

C. Determine the health status of the dual data source device and the communication status of the dual data source, and calculate the credibility of the data source according to the validity of the data source;

D. Select according to the credibility of the data source. If the credibility level of the two data sources is the same, then choose one as the main data source, otherwise choose the data source with high credibility as the main data source.

The formula for calculating the credibility of the data source is:

Data source credibility = data source validity + data source communication status + data source device health status

The valid state of the data source is 1, the invalid state of the data source is 0; the interrupted state of the data source is 0, the connection state of the data source is 1; the data source device failure or maintenance is 0, and the device is normal is 1.

When the bit flag of the validity of the quality factor in the 61850 message in the step A is invalid, the data is invalid.

The beneficial effect of the present invention is: the present invention uses the health status of the double data source device, the communication status of the data source and the validity of the data remote as the reliability of the data source, and selects the data source with high reliability as the main data source , the present invention can switch to another data source when the main data source device fails, communication is interrupted, and the device is overhauled, and when the main data source sends invalid data, it can also be switched to the data source with normal data in time, reducing the need for uploading The probability of invalid data improves the accuracy of data.

Description of drawings

Fig. 1 is the flowchart of double data source selection method of the present invention;

Fig. 2 is a flow chart of logic implementation of data source communication status and data source device health state processing;

Fig. 3 is a flow chart of the implementation of data source invalid judgment logic;

Fig. 4 is a flow chart of data source selection logic implementation.

Detailed ways

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

An embodiment of a data source validity judgment method of the present invention

The data source of the present invention uses 61850 messages in the transmission process, wherein the 61850 messages identify the validity of the data being transmitted in the validity bit of the quality factor: good (good data), reserved (scheduled), questionable (suspicious), invalid (invalid data), according to the quality bit, it can be judged whether the received data is credible. If the validity of the quality factor sent by the device is invalid, the data is considered invalid; according to the above principles, the data source is defined as invalid and the data source is valid. If a If the data source continuously sends invalid data for a certain period of time, the data source is considered to be in an invalid state; if the data sent by the data source changes from invalid to good data for a certain period of time, the data source is considered to be in a valid state . The validity judgment process of the data source is shown in Figure 3. The specific process is: record the current time as T0; receive the next data; judge the validity of the data; if the data is valid, it is judged that the data source is valid; It is invalid data, then judge whether the threshold value condition is met, Tn is the current time, t is the configured threshold value, then satisfy: Tn-T0>=t, it is determined that the data source is invalid.

Embodiment of a kind of double data source selection method of the present invention

The double data source of the present invention means that there are two independent data sources for the same measuring point, and the protection measurement and control from the data acquisition device at the process layer to the interval layer in the intelligent substation are all dual configurations, two measuring devices in the same interval Mutual master and backup, initialize the state of all data sources to normal operation, install and configure the default master data source as the master data source, and start data selection when the health status of the data source device changes or the validity of the data source changes in the master data source , the specific selection process is as follows:

1. Receive the data sent from the data source of the interval layer. The interval ID is the identification of the interval to which the data source belongs. Data source 1 and data source 2 are two data sources that are mutually active and standby. The default data source is the default when the system is initialized. The main data source, which two data sources are mutually active and backup at a certain interval, which is the default main data source when the system starts running, and the data sent by the two data sources received, according to the 61850 message and the model Analyze the specific meaning of the data, so as to judge the health status of the two data source devices, the communication status of the data source and the validity of the data source.

Among them, the validity bit of the quality factor in the 61850 message identifies the validity of the data being transmitted: good (good data), reserved (scheduled), questionable (suspicious), invalid (invalid data), and the received data can be judged according to the quality bit Whether the received data is credible, if the validity of the quality factor sent by the device is invalid, the data is considered invalid; according to the above principles, the data source is invalid and the data source is valid. If a data source continuously sends invalid data for a certain period of time time, the data source is considered to be in an invalid state; if the data sent by the data source changes from invalid to good data and lasts for a certain period of time, the data source is considered to be restored to a valid state. The validity judgment process of the data source is shown in Figure 3. The specific process is: record the current time as T0; receive the next data; judge the validity of the data; if the data is valid, it is judged that the data source is valid; is invalid data, then judge whether the threshold condition is met. Tn is the current time, and t is the configured threshold value. If Tn-T0>=t, it is determined that the data source is invalid.

The health status of the data source device includes device failure or maintenance, and the device is normal. The data source communication status includes the data source interruption status and data source connection status. The specific status can be determined according to the specific meaning of the 61850 message and model analysis data.

2. Considering the validity of the data source, the communication status, and the health status of the device, the formula for calculating the credibility of the data source is defined as:

Data source credibility = data source validity + data source communication status + data source device health status.

The valid state of the data source is 1, the invalid state of the data source is 0; the interrupted state of the data source is 0, the connection state of the data source is 1; the data source device failure or maintenance is 0, and the device is normal is 1.

3. Determine the relationship between the credibility of the above two data sources, as shown in Figure 4, if the credibility levels of the two data sources are the same, then choose one as the main data source, otherwise choose the one with high credibility The data source is the main data source, and the telecontrol device only uploads the data of the main data source to the dispatcher.

Claims (5)

1. a data source validity determination methods, is characterized in that, the step of this determination methods is as follows;

1) in 61850 messages that adopt according to data source, the validity of data is being transmitted in the judgement of the validity bit-identify of quality factor;

2) invalid if the data of sending in a data source are judged as continuously, and the lasting time of setting, think that this data source is in disarmed state;

3) if the data of sending in a data source from the invalid data that become, and lasting setting-up time, thinks that data source reverts to effective status.

2. data source validity determination methods according to claim 1, is characterized in that, when in described step 1), in 61850 messages, the bit-identify of the validity of quality factor is invalid, these data are invalid.

3. a dual data source system of selection, is characterized in that, the step of this system of selection is as follows:

A. in 61850 messages that adopt according to dual data source, the validity of data is being transmitted in the judgement of the validity bit-identify of quality factor;

If it is invalid that the data of B. sending in a data source are judged as continuously, and continue the time of setting, think that this data source is in disarmed state, if the data of sending in a data source are from the invalid data that become, and lasting setting-up time, thinks that data source reverts to effective status;

C. determine the health status of dual data source device and the communications status of dual data source, and according to the confidence level in the validity computational data source of data source;

D. according to the confidence level of data source, select, if the confidence levels of two data sources is the same, so optional one is primary data source, otherwise selects data source with a high credibility as primary data source.

4. dual data source system of selection according to claim 3, is characterized in that, the computing formula of described data source confidence level is:

Data source confidence level=data source validity+data source communications status+data source device health status

Wherein data source effective status is 1, data source disarmed state is 0; Data source interruption status is 0, and data source connected state is 1; Data source plant failure or maintenance are 0, device is normally 1.

5. dual data source system of selection according to claim 3, is characterized in that, when in described steps A, in 61850 messages, the bit-identify of the validity of quality factor is invalid, these data are invalid.

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