A power grid telemetry alarm strategy method based on floating threshold judgment method

Abstract

The present invention relates to the field of power grid monitoring and acquisition technology, and specifically to a power grid telemetry alarm strategy method based on a floating threshold determination method. The telemetry alarm strategy method includes: 1) a central processing module sets a dead data alarm threshold of a telemetry value according to the historical misjudgment data of the telemetry value that has not been refreshed; 2) the central processing module forms a floating threshold through the real-time floating of the alarm threshold described in step 1) within a safety zone, thereby reducing misjudgment of dead data monitoring of the telemetry value; different alarm threshold safety zones preset for different types of telemetry values ​​are stored in the storage module to ensure that each type of telemetry value has the most reasonable monitoring strategy; 3) the central processing module determines that when the non-refresh time of the telemetry value is greater than the alarm threshold at this moment, the telemetry value is determined to be dead data. The single, fixed mode of the telemetry non-refresh state determination threshold is changed, and the accuracy of dead data monitoring is improved through diversified alarm thresholds.

Description

Technical Field

[0001] The invention relates to the technical field of power grid monitoring and collection, and in particular to a power grid telemetry alarm strategy method based on a floating threshold determination method. Background Art

[0002] The power system is a real-time changing system, and its operation needs to be continuously tracked and monitored. With the improvement of automation level and the full implementation of unmanned substation, the monitoring of power grid equipment is completely dependent on the relevant electrical quantities and operation information transmitted to the master station in real time through the dispatching data network, and telemetry is one of the most important monitoring information. For non-standby and non-empty charging equipment, when the interval measurement and control device crashes or there is a problem with the plant and station working conditions, it is often necessary to monitor the dead data (i.e., not refreshed) of telemetry to find the problem.

[0003] In the existing power grid telemetry dead data alarm strategy, the SCADA system (dispatching automation system) sets a unified, fixed non-refresh judgment threshold. When the device's telemetry non-refresh time exceeds this threshold, the system considers the telemetry to be in a non-refresh state and automatically changes color to remind the on-duty personnel to check.

[0004] However, with the continuous development of the power grid, the amount of monitoring operation information is becoming increasingly large and the types are becoming more complex. The existing single fixed threshold alarm strategy can no longer meet the needs of real-time and accurate monitoring. On the one hand, if this fixed threshold is too large, it will lead to increased monitoring risks, but if it is too small, it will lead to a large number of misjudgments, affecting the correct judgment of the on-duty personnel. On the other hand, due to the differences in the change rules and speed of different types of telemetry, the judgment threshold for all types of telemetry is a unified fixed value, which greatly increases the misjudgment rate of different types of telemetry. For power grids where the equipment status is constantly changing, the single, fixed judgment threshold affects the rationality of the telemetry alarm strategy, and the resulting misjudgments also seriously interfere with the on-duty personnel's monitoring of telemetry information.

[0005] In summary, in order to reduce the misjudgment of telemetry dead data monitoring of non-standby and non-empty charging equipment in the power grid and improve the accuracy and real-time performance of telemetry dead data monitoring, the SCADA system (dispatching automation system) needs a more diversified and more reasonable threshold setting strategy. Summary of the invention

[0006] The purpose of the present invention is to provide a power grid telemetry alarm strategy method based on a floating threshold judgment method to address the above-mentioned deficiencies, which can provide more diversified alarm thresholds. At the same time, the thresholds can float in real time according to the operation conditions of the power grid to maintain the rationality of the threshold setting, thereby reducing the misjudgment of telemetry dead data monitoring of non-standby and non-empty charging equipment in the power grid, and improving the accuracy and real-time performance of telemetry dead data monitoring.

[0007] The present invention is achieved by adopting the following technical solutions:

[0008] A power grid telemetry alarm strategy method based on a floating threshold determination method comprises the following steps:

[0009] 1) The central processing module sets the dead data alarm threshold of the telemetry according to the historical misjudgment data of the telemetry that has not been refreshed;

[0010] 2) The central processing module forms a floating threshold through the real-time floating of the alarm threshold described in step 1) within the safety zone, thereby reducing misjudgment of telemetry dead data monitoring;

[0011] Different alarm threshold safety zones preset for different types of telemetry are stored in the storage module to ensure that each type of telemetry has the most reasonable monitoring strategy;

[0012] 3) The central processing module determines that when the non-refresh time of the telemetry data is greater than the alarm threshold at this moment, the telemetry data is considered dead data.

[0013] The floating threshold refers to the non-refresh time of all misjudgments issued by the telemetry measurement within 48 hours collected by the data acquisition module, and the maximum value among them is used as the alarm threshold at this moment. Since many telemetry measurements have similar daily telemetry curves without mode changes, using the maximum value of the non-refresh time of misjudgments within 48 hours as the alarm threshold can avoid most misjudgments with a high probability. As time changes, the threshold will also keep floating in real time, always tracking the reasonable threshold under the current power grid status.

[0014] The floating threshold floats within the safety zone that meets the safety regulations of the power system, and the upper limit of the safety zone is the pre-set safety maximum value. When the floating threshold is less than the safety maximum value, it is in the safety zone and the operation of the power grid can be reliably monitored; when the floating threshold is greater than the safety maximum value, the determination threshold will not use the floating threshold, but the safety maximum value, to prevent the monitoring risk caused by the excessively large dead data determination threshold.

[0015] The setting of different alarm threshold safety zones for different types of telemetry refers to the problem that different types of telemetry have different changing rules and changing speeds and are not suitable for using a unified alarm threshold. According to the characteristics of different types of telemetry, the maximum safety value and safety zone suitable for the characteristics of the telemetry are set to ensure the most reasonable alarm threshold setting while controlling the monitoring risk.

[0016] The power grid telemetry alarm strategy based on the floating threshold judgment method, when determining whether the telemetry is dead data, first calculates the floating threshold corresponding to the telemetry at this moment, and compares it with the telemetry non-refresh time recorded at this moment. If the non-refresh time is greater than the threshold, it is determined to be dead data telemetry and an alarm is issued. When the on-duty monitor finds the alarm, he should make a judgment on the alarm through inspection. If it is a false alarm, it will be fed back to the central processing module through the alarm interface, and the non-refresh time will be included in the subsequent floating threshold calculation to ensure the real-time update of the threshold.

[0017] A power grid telemetry alarm strategy system based on a floating threshold determination method, comprising:

[0018] Data acquisition module for collecting telemetry measurements;

[0019] A storage module for storing data collected by the data collection module and storing preset values;

[0020] A central processing module for data processing;

[0021] This system can be used to set the dead data alarm threshold of the telemetry according to the historical unrefreshed misjudgment data of the telemetry;

[0022] The alarm threshold is floated in real time within the safety zone to form a floating threshold, thereby reducing misjudgment of telemetry dead data monitoring;

[0023] Set different alarm threshold safety zones for different types of telemetry to ensure that each type of telemetry has the most reasonable monitoring strategy;

[0024] When the non-refresh time of the telemetry data is greater than the alarm threshold at this moment, the telemetry data is determined to be dead data.

[0025] The system also has an alarm display interface connected to the central processing module for displaying real-time alarm information.

[0026] The data acquisition module obtains all telemetry data that need to be monitored in the power grid through the interface function provided by the power grid dispatching automation system. The sampling period of the data sampling module is set in accordance with the power grid dispatching automation system, and can be flexibly set according to specific needs in special cases. The sampling period is set to 5 minutes.

[0027] The central processing module,

[0028] 1) Analyze the telemetry data obtained by the data acquisition module, obtain the current telemetry non-refresh time, and compare it with the current alarm threshold. When the non-refresh time is greater than the alarm threshold, it is determined to be dead data and an alarm is issued through the alarm display interface;

[0029] 2) The information fed back by the on-duty personnel through the alarm interface is sent to the central processing module for processing. If the on-duty personnel determines that the alarm is a false alarm, the non-refresh time will be included in the recalculation of the alarm threshold.

[0030] The calculation of the alarm threshold selects the maximum value of the misjudged non-refresh time within 48 hours, and compares it with the safe area of ​​this type of telemetry in the storage module. If it is within the safe area, the maximum value is used as the new alarm threshold; if it is outside the safe area, the maximum value of the safe area is used as the new alarm threshold.

[0031] The storage module is used to store the telemetry data collected by the data collection module within 48 hours and the pre-set telemetry safety zone table. The telemetry safety zone table contains the type of telemetry data to be monitored in the power grid and the preset safety zone value of the type, so that the central processing module can extract data and analyze it.

[0032] The preset values ​​are different alarm threshold safety zones set for different types of telemetry.

[0033] The power grid telemetry alarm strategy based on the floating threshold judgment method involved in the present invention changes the single and fixed mode of the telemetry non-refresh state judgment threshold, and improves the accuracy of dead data monitoring through diversified alarm thresholds. Through the real-time floating alarm threshold within the safety range, the monitoring risk control is met, while the system's misjudgment is reduced, and the rationality of the telemetry alarm strategy is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below in conjunction with the accompanying drawings:

[0035] Figure 1 It is a flow chart of a floating threshold calculation method according to the present invention;

[0036] Figure 2 The present invention relates to a floating threshold determination flow chart. DETAILED DESCRIPTION

[0037] See attached Figure 1 The calculation method diagram in the figure shows that the calculation method of the threshold floating is as follows: firstly, the telemetry data is analyzed to extract all the erroneous non-refresh time of the telemetry within 48 hours from this moment, and the maximum value thereof is used as the floating threshold to be determined.

[0038] At the same time, the pre-set maximum safety value of this type of telemetry should also be extracted and compared with the pending floating threshold. If the pending floating threshold is less than the maximum safety value, it proves that it is still within the safety zone, and the pending floating threshold is used as the judgment threshold at this moment; if the pending floating threshold is greater than the maximum safety value, it proves that it exceeds the safety zone, and the maximum safety value is used as the judgment threshold at this moment to ensure that the monitoring risk is controlled.

[0039] See attached Figure 2 In the flowchart in the figure, the non-refresh time of a telemetry measurement should be recorded and calculated in real time. The corresponding floating threshold is calculated by the type of telemetry measurement and the historical data of the telemetry measurement itself, and compared with the non-refresh time of the telemetry measurement recorded in real time. If the non-refresh time does not exceed the threshold, continue to query the non-refresh time; if the non-refresh time exceeds the threshold, an alarm is issued to remind the on-duty monitor to check.

[0040] After seeing the alarm, the on-duty monitor should judge the alarm and feed the result back to the system: if the alarm is a false alarm, the non-refresh time data of the false alarm will be sent to the calculation link of the floating threshold so that the threshold floating will be recalculated at the next moment; if the alarm is correct and proves that dead data has indeed occurred, the on-duty personnel will handle it in accordance with relevant regulations.

Claims

1. A power grid telemetry alarm strategy method based on a floating threshold determination method, characterized in that: include: 1) The central processing module sets the dead data alarm threshold of the telemetry according to the historical misjudgment data of the telemetry that has not been refreshed; 2) The central processing module forms a floating threshold through the real-time floating of the alarm threshold described in step 1) within the safety zone, thereby reducing misjudgment of telemetry dead data monitoring; Different alarm threshold safety zones preset for different types of telemetry are stored in the storage module to ensure that each type of telemetry has the most reasonable monitoring strategy; 3) The central processing module determines that when the non-refresh time of the telemetry data is greater than the alarm threshold at this moment, the telemetry data is considered dead data; The floating threshold refers to the non-refresh time of all false positives issued by the telemetry within 48 hours collected by the data collection module, and the maximum value thereof is used as the alarm threshold at this moment; The floating threshold value floats within a safety zone that meets the safety regulations of the power system, and the upper limit of the safety zone is a pre-set safety maximum value; The setting of different alarm threshold safety zones for different types of telemetry refers to the problem that different types of telemetry have different change rules and change speeds and are not suitable for using a unified alarm threshold. According to the characteristics of different types of telemetry, the maximum safety value and safety zone suitable for the characteristics of the telemetry are set, so as to control the monitoring risk while ensuring the most reasonable alarm threshold setting; The calculation method of threshold floating is as follows: firstly, analyze the telemetry data, extract all the false non-refresh time of the telemetry data within 48 hours from this moment, and take the maximum value as the pending floating threshold; at the same time, the pre-set maximum safety value of this type of telemetry should also be extracted and compared with the pending floating threshold; if the pending floating threshold is less than the maximum safety value, it means that it is still in the safety zone, then the pending floating threshold will be used as the judgment threshold at this moment; If the floating threshold to be determined is greater than the maximum safety value, which means it is beyond the safety zone, the maximum safety value will be used as the judgment threshold at this moment; When determining whether the telemetry measurement is dead data, first calculate the floating threshold corresponding to the telemetry measurement at this moment, and compare it with the telemetry non-refresh time recorded at this moment. If the non-refresh time is greater than the threshold, it is determined to be dead data telemetry and an alarm is issued; when the on-duty monitor discovers the alarm, he should make a judgment on the alarm through inspection. If it is a false alarm, it will be fed back to the central processing module through the alarm interface. The non-refresh time will be included in the subsequent floating threshold calculation to ensure real-time update of the threshold.

2. The power grid telemetry alarm strategy method based on the floating threshold determination method according to claim 1 involves a power grid telemetry alarm strategy system based on the floating threshold determination method, comprising: A data acquisition module that can be used to collect telemetry data; A storage module that can be used to store data collected by the data collection module and store preset values; and a central processing module for data processing; This system can be used to set the dead data alarm threshold of the telemetry according to the historical unrefreshed misjudgment data of the telemetry; The alarm threshold is floated in real time within the safety zone to form a floating threshold, thereby reducing misjudgment of telemetry dead data monitoring; Set different alarm threshold safety zones for different types of telemetry to ensure that each type of telemetry has the most reasonable monitoring strategy; When the non-refresh time of the telemetry data is greater than the alarm threshold at this moment, the telemetry data is determined to be dead data.

3. The power grid telemetry alarm strategy system based on the floating threshold determination method according to claim 2 is characterized in that: The preset values ​​are different alarm threshold safety zones set for different types of telemetry.

4. The power grid telemetry alarm strategy system based on the floating threshold determination method according to claim 2 is characterized in that: The system also has an alarm display interface connected to the central processing module for displaying real-time alarm information.

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