A Method of Searching and Analyzing Disturbance Sources of Power System Power Oscillation Based on Scada Historical Data

Abstract

The invention relates to a method, for analyzing power system power oscillation disturbance source, based on SCADA (supervisory control and data acquisition) historical data search. The method includes the steps of firstly, calling a time sequence database interface of an EMS (enhanced message system) to obtain historical data of an active value of power equipment in a time period in batches, and placing the data in a cache according to a set structure and allowing the same to wait for queuing calculation; secondly, queuing calling, calling an oscillation feature iterative function of historical data in each queue for iterative processing, inputting new data on the basis of a previous state, calculating feature quantity of active oscillating of one grid equipment, comparing with a preset fixed value, and returning equipment state; thirdly, if equipment measurement oscillation occurs, generating and returning oscillation records; and fourthly, sorting and positioning an oscillating source, sorting collected records according to oscillation starting time, and positioning the first equipment as the oscillating source. By the method, data accuracy is improved, convenience and practicality are achieved, and credibility of real-time positioning result information of the oscillating source is high.

Description

technical field [0001] The invention is a method for searching and analyzing power system power oscillation disturbance sources based on SCADA historical data, which belongs to the transformation technology of the method for searching and analyzing power system power oscillation disturbance sources based on SCADA historical data. The invention belongs to the field of electric power dispatching automation, and relates to a search and location technology for a power system power oscillation disturbance source. Background technique [0002] In the power system, when the generators run in parallel through the transmission line to supply power, continuous oscillation between the rotors of the generator may occur under certain operating conditions, causing corresponding oscillations in the bus voltage and power on the transmission line, affecting the normal operation of the power In severe cases, the power system will lose synchronization and even collapse. Since the direct cause...

AI Technical Summary

Problems solved by technology

[0007] All available research results show that the research on low-frequency oscillation disturbance source location technology is still in the stage of simulation and analysis, and it is difficult to provide real-time decision-making information during production and operation. Engineering applications that have not yet been practically realized

[0008]2) The distribution of PMU is limited and the monitoring range is incomplete

[0010]Contrary to RTU, PMU is not a conventional collection device for plant construction, it needs to be specially deployed, and is generally only deployed in plants with serious stability problems. Although the system has increased investment and connected a large number of PMU devices, the problem of limited PMU distribution and incomplete monitoring range is still very prominent

[0011]3) Inadequate maintenance and low data accuracy

[0012]Because the PMU is an additional device for remote data collection, it has little impact on the real-time operation of the power grid. There are deviations in operation, which often cause data problems

[0013] The master station often accesses the PMU data by building a special WAMS (Wide Area Measurement System) system, which is difficult to integrate with the EMS system, and these systems usually lack professional staff and are difficult to maintain

[0014]4) Implementation costs are too high

[0015]The wide-area monitoring system needs to rebuild the data collection framework, and the factory station needs to specially deploy PMU devices. The application of the main station system is complicated, which will inevitably lead to a significant increase in implementation costs

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